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Erschienen in:

Open Access 01.08.2008

Effects of Statins on High-Density Lipoproteins: A Potential Contribution to Cardiovascular Benefit

verfasst von: Fergus McTaggart, Peter Jones

Erschienen in: Cardiovascular Drugs and Therapy | Ausgabe 4/2008

Abstract

Purpose

The objective was to systematically review clinical trial data on the effects of statins on high-density lipoproteins (HDL) and to examine the possibility that this provides cardiovascular benefits in addition to those derived from reductions in low-density lipoproteins (LDL).

Methods

The PubMed database was searched for publications describing clinical trials of atorvastatin, pravastatin, rosuvastatin, and simvastatin. On the basis of predefined criteria, 103 were selected for review.

Results

Compared with placebo, statins raise HDL, measured as HDL-cholesterol (HDL-C) and apolipoprotein A-I (apo A-I); these elevations are maintained in the long-term. In hypercholesterolemia, HDL-C is raised by approximately 4% to 10%. The percentage changes are greater in patients with low baseline levels, including those with the common combination of high triglycerides (TG) and low HDL-C. These effects do not appear to be dose-related although there is evidence that, with the exception of atorvastatin, the changes in HDL-C are proportional to reductions in apo B-containing lipoproteins. The most likely explanation is a reduced rate of cholesteryl ester transfer protein (CETP)-mediated flow of cholesterol from HDL. There is some evidence that the statin effects on HDL reduce progression of atherosclerosis and risk of cardiovascular disease independently of reductions in LDL.

Conclusion

Statins cause modest increases in HDL-C and apo A-I probably mediated by reductions in CETP activity. It is plausible that such changes independently contribute to the cardiovascular benefits of the statin class but more studies are needed to further explore this possibility.

1 Introduction

It has been known for over 30 years that circulating levels of high-density lipoprotein (HDL) are inversely associated with the risk of atherosclerotic diseases [1]. Population studies, in which HDL was measured as HDL-cholesterol (HDL-C) or apolipoprotein A-I (apo A-I), have repeatedly confirmed the strong and apparently independent relationship with risk of coronary heart disease (CHD) [24]. A partial understanding of HDL metabolism has emerged in this period, particularly regarding the role of apo A-I, the major protein component of HDL, in promoting cholesterol efflux from foam cell macrophages of atherosclerotic lesions [5, 6]. According to current models, HDL operates as a dynamic system, removing excess cholesterol from cells, transporting it to the liver for excretion, and ensuring overall cholesterol homeostasis in the body. Recent laboratory evidence suggests that HDL may in addition retard atherosclerosis through antioxidant and anti-inflammatory actions [7, 8]. Evidence from both experimental and population studies has led to the concept of HDL as a protective system, mitigating the damaging effects on the vessel wall of apo B-containing low and very-low-density lipoproteins (LDL and VLDL). HDL is metabolically interrelated with the apo B-containing lipoproteins; low HDL-C levels are commonly found in subjects with elevated serum triglycerides (TG) and VLDL, a profile that carries a high risk of CHD [2]. Moreover, low HDL-C levels are frequent in those with obesity, metabolic syndrome or type 2 diabetes (T2D), conditions in which TG metabolism is abnormal [9]. HDL levels are also affected by some lifestyle factors such as exercise and smoking. In addition, there are a number of important independent genetic determinants [10].
The guidelines issued by the Adult Treatment Panel III of the National Cholesterol Education Programme [11] identify low HDL-C level as an important risk factor for cardiovascular disease (CVD) and as a criterion for the initiation of lifestyle changes, and use of therapeutic agents. Nevertheless, treatment emphasis remains firmly on reduction of LDL-C, primarily using HMG-CoA reductase inhibitors (statins), which very effectively reduce circulating levels of atherogenic LDL via upregulation of LDL receptors. The clinical success of statins confirms the epidemiological evidence and points to elevated LDL as a direct cause of atherosclerosis progression [12]. However, statins also increase HDL, measured as HDL-C or apo A-I, and, based on the strong epidemiologic evidence, it is possible that this action may independently contribute to their benefits.
From the combined data from four large prospective studies, Gordon et al. [13] estimated that an increment of 1 mg/dl in HDL-C is associated with a 2–3% lower risk of CHD. Thus, a relatively modest statin-mediated effect on HDL-C, for example, an increase of 10% that is possible with statins [14], might provide important protection from CVD in addition to the undoubted benefits of LDL reduction. However, extrapolation from epidemiology to putative benefits of drug therapy requires caution. Support for the concept of HDL-raising by drugs comes from prospective trials of fibrates and of nicotinic acid, two drug types with substantial effects on HDL and VLDL metabolism [1518], and also from early clinical work with infusions of apo A-I in liposomes where dramatic reductions in coronary atheroma have been observed [19]. In contrast, recent trials of torcetrapib, an inhibitor of cholesteryl ester transfer protein (CETP) that induces substantial increases in HDL-C and apo A-I failed to show any benefit on atherosclerosis [2022]. It is possible that the plasma concentrations of HDL-C or apo A-I may not always reflect the protective activity of the HDL system. It is important to consider both the magnitude of effect on HDL level and the mechanism by which it is achieved. Two explanations have been proposed for the effects of statins on HDL. In cell experiments, inhibition of HMG-CoA reductase by statins was shown to increase peroxisome-proliferator receptor activator-alpha (PPARα) activity and, like fibrates, to elevate the hepatic synthesis of apo A-I [23]. Such an effect would be expected to increase the formation of HDL precursor particles. A second explanation revolves around the metabolic relationship between HDL and TG-rich atherogenic lipoproteins. Guerin et al. [24] showed that atorvastatin reduced circulating levels of CETP, and also importantly the rate of CETP-mediated CE transfer from HDL to VLDL secondary to reduction in the latter. Statins, however, are not known to be direct inhibitors of CETP.
With statins, elevations in HDL-C range between 3% and 15%. These are relatively modest increases compared with agents such as nicotinic acid, fibrates, and the recently developed CETP inhibitors. However, given the widespread use of statins and the putative benefit of HDL elevation, it is important to thoroughly assess this aspect of statin action. In this review we consider: (1) data from placebo-controlled trials to confirm that statins have real effects on HDL, (2) how effects on HDL compare between statins when administered at recommended starting doses, (3) dose-related effects of statins on HDL and comparative data at the highest prescribed doses, (4) the effects of statins in patients with mixed hyperlipidemia and diabetes, and (5) the longer-term effect of statins on HDL and evidence linking this to clinical benefit.

2 Methods

For this review, searches were conducted for publications that appeared on the PubMed database up to the end of 2007 that describe clinical trials of atorvastatin, pravastatin, rosuvastatin, and simvastatin; this generated 2,630 citations. The studies varied widely with respect to populations studied, treatment duration, and design. Selection from the total was based on predefined criteria. Only articles that provided HDL data from randomized clinical trials were included (almost 50% of the total). Sub studies were not included unless they were particularly pertinent. Since variability in change in HDL parameters with statin treatment greatly exceeds that for LDL, only studies that utilized ≥50 patients per group in parallel design or ≥30 in a crossover design were included. In addition, only those studies with a dietary lead-in period ≥2 weeks (given the influence of diet on HDL levels) and a treatment period ≥6 weeks were included; 47% of studies were excluded on these design criteria.
Finally, we considered the method by which HDL-C had been measured. The most commonly used assays are those in which it is measured after apo B-containing lipoproteins are precipitated from plasma with polyvalent anion and divalent metal cation; one such is the reference method of the US Center for Disease Control. Recently developed homogeneous assays employ a variety of reagents to block apo B-containing lipoproteins, allowing assay only of HDL-C. However, questions remain as to the specificity of these assays under contrasting conditions of high and low LDL levels as typically observed in statin trials [25]. Only those studies were included in which HDL-C was confirmed in the publication or after enquiry to the lead author as having been measured using a precipitation method. Fifteen percent of the remaining citations were excluded on this basis leaving 103 publications that conformed to our criteria; these form the basis of our review.

3 Effects of statins on HDL: evidence from placebo-controlled trials

Most clinical trials of statins were designed with LDL-cholesterol (LDL-C) as the primary endpoint and conducted in patients with hypercholesterolemia, excluding those with very high TG. Usually the study populations had normal HDL-C levels on average and were treated for at least 6 weeks. In the placebo-controlled trial of Hunninghake et al. [26], a study was made of the rate of change of lipoprotein parameters in response to a range of doses of pravastatin. Patients were randomized following dietary stabilization and then treated for 12 weeks. In the pravastatin groups, HDL-C increased from baseline, reached maximal levels at 4 weeks and remained steady thereafter, whilst in the placebo group it was almost unchanged. At week 12, pravastatin had increased HDL-C by 6–7% from baseline, compared with 1% for placebo. The observed time course of the HDL-C increases with pravastatin paralleled the reductions in both LDL-C and TG, suggesting a mechanistic relationship between the changes. A treatment period of ≥6 weeks (one of our selection criteria) appears adequate for assessing the effects of statins on HDL-C.
Statin-induced effects on HDL are relatively small compared with those of LDL and, as a result, most clinical trials of statins are underpowered with respect to HDL parameters. In this review, the emphasis is initially placed therefore on those studies with the largest sample sizes. To allow comparison between trials, data relating to errors of the estimates for changes in HDL-C and apo A-I have been converted to 95% confidence intervals. Figure 1 describes the findings from the four largest placebo-controlled statin trials, which measured both HDL-C and apo A-I and reported the errors of the estimates of change. All four trials were in patients with primary hypercholesterolemia with TG levels <450 mg/dl. Patients were randomized in a parallel design following a dietary lead period ≥2 weeks. In two of the studies [29, 30], the errors of estimates are reported only for the pooled 10–80 mg simvastatin dose groups. These pooled data are shown in Fig. 1 to allow comparison with placebo. It is apparent that the percentage changes in HDL-C in the statin-treated groups are consistently greater than placebo; the lack of overlap in the 95% confidence limits suggests real drug responses. A similarly large study of pravastatin 20 mg [31] found a 7% increase in HDL-C compared with placebo (p < 0.001). Over the four trials the magnitude of effect on apo A-I was consistently less than on HDL-C, and not statistically different from placebo in two of them. This suggests that statins change HDL to a more cholesterol-rich form.
Eight other smaller placebo-controlled trials (n ≤ 106) in hypercholesterolemic patients of duration ≤6 months also fitted our selection criteria [3239]. In 14 of the 15 statin dose groups comprising these studies, the mean change in HDL-C was numerically greater than in the corresponding placebo group. This was also the case for apo A-I in all nine groups in which it was measured. However, differences vs. placebo were not always significant, perhaps reflecting smaller group sizes. Similar findings were reported in a 12-week study in patients of African-American descent, where the HDL-C response to pravastatin was numerically greater but not significantly different from placebo [40].
It is important to consider whether statin-induced changes in HDL, like those in LDL, can be maintained over the long term. Keech et al. [41] measured the effects of simvastatin 20 and 40 mg over 3 years in patients considered to be at risk of CHD. Although this study did not include a dietary lead-in period, changes from baseline in the placebo group were minor. In the combined simvastatin groups, significant increases in HDL-C of 8–10% vs. placebo were maintained over 3 years while increases in apo A-I were also significant vs. placebo (5% measured up to 2 years only). HDL-C and occasionally also apo A-I have been monitored in large-scale placebo-controlled studies employing atherosclerosis progression or cardiovascular event endpoints, conducted for ≥2 years. The HDL-C data from these trials are summarized in Table 1. In general, the study populations were more inclusive than in shorter-term studies. In all but one trial, there was a positive effect on HDL-C (range, 1.5–10%) relative to placebo. The apo A-I responses when measured were lower and relatively variable. Data from these longer-term trials are consistent with those of shorter lipid-endpoint studies bearing in mind that compliance often decreases as the duration of the study increases.
Table 1
Effects of statins on HDL-C in long-term placebo-controlled trials with atherosclerosis or cardiovascular event endpoints
Study
Patient population
Dietary run-in
Mean BL HDL-C (mg/dl)
Treatment (mg)
Duration (year)
% change in HDL-C vs. placebo
4S, 4S Study Group [42]
CHD and TC 212–309 mg/dl
Yes
46
S20–40
5
7 (mean on trial)
KAPS Salonen et al. [43]
Males with LDL-C >155 mg/dl
Yes
46
P40
3
3.0 (mean on trial)
PLAC-I, Pitt et al. [44]
CHD and LDL-C 140–190 mg/dl
Yes
41
P40
3
5 (mean on trial)
PLAC-II, Byington et al. [45]
CHD and LDL-C 60th–90th percentile
No
40–42
P20–40
3
−2.8 (mean on trial)a
REGRESS, Jukema et al. [46]
Males with CHD and normal to moderately elevated TC
Yes
36
P40
2
9 (at 2 years)
WOSCOPS, Shepherd et al. [47]
Men: LDL-C ≥155 mg/dl
Yes
44
P40
5
5 (mean on trial)
CAIUS, Mercuri et al. [48]
One carotid lesion and moderately elevated LDL-C
Yes
53
P40
3
4.4 (mean on trial)
CARE, Sacks et al. [49]
CHD and LDL-C 115–174 mg/dl
Yes
39
P40
5
5 (mean on trial)
HPS, HPS Study Group [50]
CHD or other occlusive vascular or diabetes
No
41
S40
5
2.8 (mean on trial)
PROSPER, Shepherd et al. [51]
History of or risk factors for vascular disease, 70–82 years
Yes
50
P40
3
5 (at 3 months)
LIPID, Tonkin et al. [52]
CHD and TC 155–271 mg/dl
Yes
36 (median)
P40
6
5 (mean in first 5 years)
ASCOT-LLA, Sever et al. [53]
Hypertension and 3 other risk factors
No
50
A10
5
1.5 (median 3 years)
METEOR, Crouse et al. [54]
10-years CHD risk <10%, moderately elevated TC and moderate CIT
No
49–50
R40
2
5.2 (mean on trial)
CORONA, Kjekshus et al. [55]
Systolic heart failure and ≥60 years
No
48
R10
3
4 (at 3 months)
aCalculated from baseline data
A atorvastatin, BL baseline, CIT carotid intimal thickening, CHD coronary heart disease, HDL-C high-density lipoprotein cholesterol, HPS Heart Protection Study, LDL-C low-density lipoprotein cholesterol, P pravastatin, R rosuvastatin, S simvastatin, TC total cholesterol, 4S Scandinavian Simvastatin Survival Study
The relatively large sample sizes in outcomes studies provide opportunities to identify factors contributing to the HDL response and thereby deduction as to possible mechanisms. In the untreated population, there is a well-established inverse curvilinear relationship between plasma levels of TG and HDL-C, with most variation in HDL-C being apparent at TG levels <220 mg/dl [56]. This reflects in part the action of CETP since high VLDL-TG levels facilitate the two-way transfer of TG and cholesteryl ester between VLDL and HDL. In a follow-up to the West of Scotland Coronary Prevention Study (WOSCOPS) [47], Streja et al. [57] analyzed data from those participants in the active group who were fully compliant (about half). Mean percent change in the pravastatin group decreased across quintiles of baseline HDL-C, such that the absolute increment remained relatively constant. Independent contributors to statin-induced change in HDL-C were alcohol intake, body mass index, and reduction in plasma TG, all of which have influence on plasma CETP levels and/or activity. Most likely the reduction in cholesteryl ester transfer from HDL that results in elevation of HDL-C is governed by the degree of reduction in VLDL [24]. The effect of statin would be to shift the patient’s position on the population curve relating HDL-C to TG levels. Such a mechanism involving CETP would be consistent with alteration of the particle size distribution of HDL towards larger, relatively cholesterol-rich particles that are characteristic of healthy low-risk populations manifesting the ideal profile of low TG and high HDL-C. Such statin-induced changes in subpopulations of HDL have been consistently demonstrated in the studies of Asztalos et al. [5861].
Hepatic lipase is another factor with a key role in TG and lipoprotein metabolism. Increased hepatic lipase due to a common polymorphism (−514 C→T) is associated with lower levels of the larger HDL particles (HDL2) as well as greater numbers of small dense (more atherogenic LDL) [6266]. In an intervention trial with combination lipid-lowering therapy including lovastatin [65], subjects homozygous for this allele had the highest hepatic lipase activity, lowest HDL2-C and the most angiographic improvement compared to those heterozygous or lacking the allele.
In summary, data from placebo-controlled trials in hypercholesterolemic subjects confirm that statins cause definite increases in HDL-C; the mechanism most likely involves reduced transfer of cholesteryl ester from HDL to VLDL but other factors such as hepatic lipase and other statin-induced effects may also contribute. The data also suggest that statin effects on HDL-C and apo A-I are maintained over time and that a treatment period of 6 weeks is sufficient to assess and compare different statins in this respect.

4 Comparative effects of statins on HDL at recommended starting doses

In clinical practice, most patients remain on the statin dose first prescribed [67] so it is appropriate to first compare the effects on HDL of statins when used at their recommended starting doses: atorvastatin 10 or 20 mg, pravastatin 20 or 40 mg, rosuvastatin 5 or 10 mg, and simvastatin 20 or 40 mg. Figure 2 shows data from the four largest comparative trials (n ≥ 156 per group) conducted to date that included these starting doses and met our criteria. Blasetto et al. [71] reported data from five individual trials prospectively designed for pooling into two sets (1) [29, 74, 75] and (2) [76, 77]. All trials were of parallel design with treatment duration ≥6 weeks, measured both HDL-C and apo A-I and reported the errors of the estimates of percentage change. Eligible patients included those with hypercholesterolemia, a relatively normal HDL-C level, TG <400 mg/dl, with or without high risk, manifest CHD or T2D.
Figure 2a shows there were no consistent differences in HDL responses between the upper and lower starting doses of each statin. Between the statins there is a tendency for rosuvastatin to have the greatest effect on both HDL-C and apo A-I. Mean percent changes in HDL-C from baseline across the trials weighted by patient numbers were as follows: rosuvastatin 8.5%, pravastatin 6.5%, simvastatin 6.4%, atorvastatin 5.5%. In some but not all trials, significant differences have been reported in the HDL-C response to the starting doses of rosuvastatin and atorvastatin. For example, in the largest study [68], the effect of rosuvastatin 10 mg on HDL-C (9.2%) was significantly greater than either atorvastatin 10 mg (6.8%, p < 0.01) or 20 mg (5.7%, p < 0.0001). Apo A-I responses show similar trends between statins but are generally lower than for HDL-C, with greater variability (Fig. 2b). Two further large trials compared atorvastatin and simvastatin [78, 79, data not shown]. Olsson et al. [78] (n ≥ 535 per group) reported notably lower HDL-C responses than in the trials described above although the effect of simvastatin on HDL-C (3.3%) was significantly greater than for atorvastatin (−0.1%). The same was true of apo A-I (0.8% vs. −1.8%). However, no difference was apparent between these statins in the study of Barter and O’Brien [79]. Moreover, Insull et al. [80] compared atorvastatin 10 mg, rosuvastatin 10 mg, and simvastatin 20 mg and found that all increased HDL-C to similar extents (6–7%).
In addition to those described above, 31 further trials in hypercholesterolemic patients that included starting doses of one or more statins met our selection criteria. In 17 of these [74, 79, 8195], the overall changes in HDL-C were consistent with those shown in Fig. 2a in that they fell within the ranges of confidence limits shown. As in the case of Olsson et al. [78], statin trials occasionally provide unexpectedly low or high HDL-C responses. Milionis et al. [96] reported only a modest increase in HDL-C with rosuvastatin 10 mg (3.3%) and a fall of 1.6% with atorvastatin 20 mg. Negative HDL-C responses to pravastatin have been reported [34] as well as atypically low responses to starting doses of simvastatin [32, 38, 9799]. In contrast, unexpected relatively large increases in HDL-C have occasionally been reported for pravastatin 10–40 mg [100102], simvastatin [99, 103105], and atorvastatin (7.3–9.0%) [105, 106]. In two studies of particular ethnic groups, one in African-Americans [94] and one in Hispanic-Americans [95], HDL-C responses to rosuvastatin and atorvastatin were consistent with Fig. 2a.
Most trials of the recommended starting doses of statins in hypercholesterolemic patients have reported positive effects on HDL, typically between 4% and 10% in terms of HDL-C. There was a tendency for rosuvastatin to provide greater increases than other statins. However, no consistent differences are apparent between the lower and higher starting dose of each statin.

5.1 Statin dose–response

Figure 3 provides an overview of the five largest studies that measured the lipid effects of three or more doses of each statin. The variability in HDL-C and apo A-I responses in these trials was such that only if there had been gradients of at least 20% with each doubling of dose would clear dose–response relationships have been apparent. In the study of Jones et al. [72], for example, the coefficients of variation of percent change in HDL-C and apo A-I were approximately 200%. As evident in Fig. 3a, the confidence limits of the estimates of percent change in HDL-C overlap between doses in nearly all cases, making it uncertain whether or not true dose-relationships exist over the clinical range for each statin. The notable exception is atorvastatin, for which change in HDL-C can be seen to decrease from the lowest (10 mg) to the highest dose (80 mg) [72, 108, 109]. Between atorvastatin and rosuvastatin (the two statins with greatest effect on LDL-C), there are contrasting effects on HDL-C such that rosuvastatin maintains a relatively constant effect across doses whilst atorvastatin does not. Similar findings have been provided by smaller parallel group [29], forced-titration [110, 111] and crossover [112] trials. For simvastatin, even with an extended dose range of up to 160 mg, the effects on HDL parameters did not appear to be dose-related [112].
The lack of obvious dose–response relationships has led to the suggestion that mechanisms different to those regulating the LDL response must predominate in mediating HDL changes [113]. However, as shown in Fig. 4, with the important exception of atorvastatin, the HDL-C changes observed by Jones et al. [72] do seem to parallel those of LDL-C and TG. In Fig. 4, the regression lines are fitted by robust MM-estimation that effectively down-weights outliers. Notably, the data points for atorvastatin deviate from the regression lines in a dose-related manner. It is perfectly possible that the effect of a statin on HDL parameters is the result of two or more competing processes such that any relationships with dose tend to be obscured. A tendency to increase HDL-C as a result of reduced CETP activity due to reductions in TG might be counteracted by negative effects due to depletion of hepatic cholesterol consequent on inhibition of HMG-CoA reductase. According to recent experimental work in animals, the liver could be the major source of the cholesterol that circulates in HDL [6]. It is also possible that such hypothetical negative effects might vary between different statins according to the unique pharmacodynamic profile of each compound.
This analysis suggests that with the exception of atorvastatin, statin-induced increases in HDL-C occur in parallel with reductions in apo B-containing lipoproteins, but that dose relationships can be obscured by high variability and competing effects. It is consistent however with the view that the predominant mechanism giving rise to statin-mediated increases in HDL-C is reduced cholesterol ester transfer into VLDL and LDL, secondary to reduced levels of these lipoproteins. The reason atorvastatin does not conform to this pattern and the potential clinical significance is a matter of current speculation.

5.2 Effects of statins at the maximal clinical doses

Figure 5 shows the HDL-C and apo A-I data from the five largest studies (three with HDL-C as the primary endpoint) employing the highest clinically-used doses of atorvastatin, simvastatin and rosuvastatin. All five studies reported a significantly lower HDL-C effect for atorvastatin compared with other statins. Crouse et al. [115] directly compared atorvastatin 20 mg with simvastatin 40 mg, and atorvastatin 40 mg with simvastatin 80 mg with the rationale that these particular statin/doses were approximately matched with respect to LDL-C reduction. Atorvastatin increased HDL-C significantly less than simvastatin in both comparisons, a finding confirmed by Kastelein et al. [116], and significant differences in apo A-I were also observed in the higher-dose comparative pair. In other randomized, double-blind trials of high-dose statin therapy, Smilde et al. [120] showed similar HDL-C increases for atorvastatin 80 mg and simvastatin 40 mg, while Ballantyne et al. [117] reported a significantly lower increase in HDL-C with atorvastatin 80 mg compared with simvastatin 80 mg, the effect of atorvastatin on apo A-I being slightly negative. Leiter et al. [119], compared rosuvastatin 40 mg with atorvastatin 80 mg, and found significantly greater increases in both HDL-C and apo A-I with rosuvastatin (9.6% and 4.2%, respectively) than atorvastatin (4.4% and 0.5%, respectively). Similar findings were reported in a forced-titration study of these two statins [121].
The percentage change in HDL-C induced by statins is usually greater in patients with lower than in those with higher baseline HDL-C levels. For example, Ballantyne et al. [117] reported greater HDL-C changes with baseline HDL-C <40 vs. ≥40 mg/dl when patients were treated with simvastatin 80 mg or atorvastatin 80 mg. Patients with acute coronary syndromes tend to have low HDL-C levels and in these, the HDL-C increases with statins were relatively high [122].
Comparisons between statins given at the higher doses consistently show atorvastatin to have a lesser effect on HDL compared to simvastatin or rosuvastatin, in line with the dose-related effects discussed earlier. Percentage changes in HDL-C are greater in patients with initially lower baseline values.

6 Effect of statins compared with other drugs that raise HDL

Fibrates are generally more effective than statins in lowering plasma TG and are used primarily in patients with elevated TG levels. Through their agonist action on PPARα, fibrates alter the expression and activity of genes involved in lipid metabolism, in particular increasing the hepatic synthesis of apo A-I [123]. Fibrates can reduce LDL, to a limited degree, but usually have a considerably greater effect on HDL than statins. This may be due both to the direct effect of increased entry of apo A-I into the circulation and to the indirect effect of reduction in VLDL-TG. For example, in a 24-week trial comparing gemfibrozil 600 mg twice daily with pravastatin 40 mg/d in patients with familial or polygenic hypercholesterolemia, TG <250 mg/dl and relatively normal HDL-C levels, pravastatin as expected lowered LDL-C more than gemfibrozil but had lesser effect on HDL-C (5% vs. 13%, respectively, p < 0.01), although changes in apo A-I were similar (8% vs. 7%, respectively) [124]. Similar differences were reported for these comparators by Wiklund et al. [35]. Superior effects on HDL-C favoring the fibrate have also been reported between gemfibrozil and simvastatin [125], bezafibrate and simvastatin [126], and micronized fenofibrate and pravastatin [127]. Two studies reported similar effects when comparing fenofibrate and simvastatin [128, 129]. The latter study found particularly high HDL-C responses (18% vs. 15%, respectively), the reason for which is unclear. Nicotinic acid (niacin) is a long-established therapy with modest effect on LDL but substantial impacts on TG and HDL. Depending upon the type of hyperlipidemia and baseline HDL-C, extended-release niacin can increase HDL-C by up to 30% and decrease TG levels by 40–50% [130, 131].
Unprecedented increases in HDL-C and apo A-I levels have been observed in phase II trials of the newly developed direct inhibitors of CETP. For example, in patients with low HDL-C levels, 4 weeks of treatment with torcetrapib 120 mg twice daily increased HDL-C from 34 to 70 mg/dl (106%) and apo A-I from 112 to 151 mg/dl (36%) [132], considerably greater increases than seen with statins, fibrates, or nicotinic acid. However, recent imaging and outcomes studies with torcetrapib in combination with atorvastatin have not indicated any beneficial impact upon atherosclerosis or cardiovascular morbidity and mortality, possibly due to a unique adverse effect of torcetrapib on aldosterone, electrolytes, and blood pressure [2022, 133].
Fibrates and nicotinic acid increase HDL-C and lower TG usually to a greater extent than statins but their impact on LDL-C is considerably less. They are most useful in patients with hypertriglyceridemia. Direct inhibitors of CETP cause the greatest increases in HDL-C but the clinical value of this mechanism is currently unknown.

7 Effects of statins combined with other drugs on HDL in patients with hypercholesterolemia

Bile acid sequestrants such as cholestyramine and inhibitors of cholesterol absorption such as ezetimibe reduce levels of atherogenic lipoproteins albeit to a lesser degree than statins. Nevertheless, these agents can be effective in combination with statins, providing incremental reductions in LDL-C in cases of severe hypercholesterolemia and resistance to statin therapy. When used alone, these agents produce small increases (5–8%) in HDL-C [29, 30, 33, 103, 134]. However, while cholestyramine and pravastatin in combination provided a greater reduction in LDL-C than either monotherapy, there was no additive effect on HDL-C [33, 135]. Two 12-week studies compared the full range of simvastatin doses with and without ezetimibe 10 mg. The larger study [30] (n ≥ 156 per group) found no significant additive effect of ezetimibe on HDL-C whilst the smaller study [29] (n ≥ 52 per group) showed a modest but significant 2.4% (p < 0.05) increment averaged across doses. Similar rather modest incremental HDL-C effects of ezetimibe with statins were reported by Feldman et al. [136] and Ballantyne et al. [137, 138]. In these studies there was little evidence of any additive effects on apo A-I. Ballantyne et al. [108, 139] compared the full range of simvastatin doses in combination with ezetimibe to those of atorvastatin alone and found, at the 40 and 80 mg doses, a significantly greater effect on HDL-C with the simvastatin combination, which was attributed to the attenuation of the HDL-C response at higher doses described earlier. Catapano et al. [107] compared the ezetimibe/simvastatin combination in the range 10/20 to 10/80 mg with rosuvastatin 10/40 mg and found no difference in the HDL-C responses to those of the rosuvastatin monotherapy (7% to 8%). In summary, the addition of either bile acid sequestrants or inhibitors of cholesterol absorption provides at best only modest increments in the HDL-C response to statins.

8 Effects of statins in mixed hyperlipidemia, metabolic syndrome, and T2D

In many individuals, low HDL-C levels (<40 mg/dl men; <50 mg/dl women) are associated with elevated TG levels, which, in turn, are common in obesity, insulin resistance, metabolic syndrome, and T2D [140]. As noted above, there is a well-established inverse correlation between TG and HDL-C [56] and the combination of high TG, low HDL, and abnormal LDL (small-dense LDL), often called the “lipid triad”, is particularly prevalent in these conditions and thought to be strongly atherogenic [141]. Indeed, the linkage of HDL-C levels to these associated abnormalities of atherogenic lipoproteins may explain much of the predictive power of HDL-C.

8.1 Elevated triglycerides and mixed hyperlipidemia

Fibrates and nicotinic acid are the drugs of choice in severe hypertriglyceridemia. However, in mixed hyperlipidemia, when both TG and LDL are elevated, statins can provide a logical alternative as they are very effective in reducing LDL-C and can also lower TG. This point is supported by a number of studies [142146]. The study by Grundy et al. [144] exemplifies the efficacy of a statin-fibrate combination in mixed hyperlipidemia. With simvastatin 20 mg together with fenofibrate 160 mg, HDL-C and apo A-I increased by 19% and 9% vs. 10% and 5% with statin alone. In a similar population, Farnier et al. [147] found that a combination of simvastatin 20 mg, fenofibrate 160 mg, and ezetimibe 10 mg raised HDL-C and apo A-I by 19% and 11% respectively. With both statins and fibrates, the increases in HDL-C generally reflect the reductions in VLDL-TG, suggesting reduced CETP-mediated flow of cholesteryl ester from HDL to VLDL as a major link between the HDL effects of statins and fibrates. Interestingly however, HDL size increased with simvastatin (3%) but not with gemfibrozil, hinting that there are differences as well as similarities in the mechanisms involved with the two classes of drugs.

8.2 Metabolic syndrome

Attention has increasingly focused on the effects of statins in ameliorating the high risk of CHD in patients with metabolic syndrome. Raised TG and low HDL-C represent two of five National Cholesterol Education Program (NCEP) criteria defining the metabolic syndrome [11]. In a placebo-controlled study of patients with metabolic syndrome so defined, atorvastatin 10 mg increased HDL-C by 5.1% and rosuvastatin 10 mg by 9.5% (p < 0.01 between treatments) compared with +1% for placebo [148]. There were corresponding but lesser changes in apo A-I. Similar increases in HDL-C have been seen in metabolic syndrome subgroups from larger trials [110, 149].

8.3 Diabetes

T2D carries a high risk of CHD. Statin therapy substantially reduces this risk and they are now the standard of care [150]. Evidence from trials of statins in this condition suggests that the degree of statin-induced change in HDL parameters depends on the baseline TG and HDL-C levels. For example, the study of Stein et al. [151] included patients with T2D and mixed hyperlipidemia having relatively high TG (median 391 mg/dl) and low HDL-C (mean 39 mg/dl) at baseline. After 6 weeks of treatment with simvastatin 40 or 80 mg/d, the increases in HDL-C were substantial: 13% and 16% compared to 3.3% with placebo; the corresponding changes in apo A-I were 8.2%, 10%, and 4.0%. In similar populations, Durrington et al. [152] observed that rosuvastatin 5 or 10 mg elevated HDL-C by 9.9% and 10% compared with 1.2% for placebo while Gentile et al. [153] recorded increments in HDL-C of 7.1–7.4% with atorvastatin, simvastatin, and pravastatin (each 10 mg/d) and a slight reduction with placebo. In T2D subjects with a baseline HDL-C <40 mg/dl (mean 34 mg/dl), Miller et al. [154] found HDL-C increases of 4.8% and 8.5% with simvastatin 40 and 80 mg, vs. a slight reduction with placebo. In contrast, in T2D study populations with relatively normal TG and HDL-C at baseline, the statin-induced HDL-C responses were usually relatively less as reported by Schweitzer et al. [155] and by Schuster et al. [68]. Moreover, in two large-scale outcome studies evaluating the effects of atorvastatin 10 mg in these patients, there were only non-significant changes in HDL-C (1–2%) and TG (−4% to −19%) [156, 157]. There has been only one study of patients with T2D that has recorded a substantial HDL-C response to atorvastatin (17%), but this compared to a 13% change with placebo [158]. In contrast to the many studies of statins in patients with T2D, relatively few have been performed in type 1 and none matched our selection criteria.
Statins are effective in raising HDL-C in mixed hyperlipidemia, metabolic syndrome, and T2D, but this seems to be dependent on baseline parameters. Statins are less effective than fibrates in raising HDL-C in these conditions but achieve much greater LDL-C reductions. The evidence suggests that combination of a statin with a fibrate may provide benefits both on LDL and on the TG-HDL axis.

9 Effects of statins on HDL over the longer-term and the relationship with clinical benefit

Data from placebo-controlled trials of long duration (Table 1) suggest that the effects of statins on HDL are maintained over time. The question of whether differential HDL effects between statins are also maintained is more difficult to answer, as few long-term trials have made such comparisons. However, the relatively attenuated HDL effect of high dose atorvastatin has been observed in long-term studies. In a double-blind comparison of atorvastatin 80 mg and pravastatin 40 mg [159], the percentage increases in HDL-C from baseline at 18 months were 2.9% and 5.6% respectively. An absolute difference in HDL-C levels of 1.2–1.9 mg/dl between the groups treated with simvastatin 20 mg or atorvastatin 80 mg (in favor of the former) was reported to be maintained over 4 years in the study of Pedersen et al. [160], although the difference diminished in the fifth year of observation. Similarly, in acute coronary syndrome patients, there was a difference of 1.6% in HDL-C levels between pravastatin 40 mg and atorvastatin 80 mg over a 2-year period, Cannon et al. [122]. However, there was no difference in this respect between 10 mg and 80 mg of atorvastatin over 5 years [66].
Statin treatment reduces coronary events in patients with low HDL-C levels [161163]. Moreover, HDL-C levels continued to predict cardiovascular risk even when LDL-C was reduced to very low levels by atorvastatin [164]. However, the respective contribution made by statin-induced increases in HDL-C to cardiovascular benefit is not always apparent from clinical trial data. This may be due to considerable inter-individual differences (depending in turn on the particular combination of risk factors and genetic predisposition) in the degree to which a change in HDL impacts upon disease progression and perhaps most importantly to the overwhelming positive effect of reductions in LDL. In the outcome studies mentioned above in which statins were compared, the differences in HDL-C responses due to pravastatin in Cannon et al. [122] and simvastatin in Pedersen et al. [160] did not outweigh the superior LDL-C reductions due to atorvastatin 80 mg. The potential contributions made to outcomes by statin-induced changes in HDL-C are best discerned in the large scale such as in the Pravastatin Pooling Project, which combined data from three large trials of pravastatin 40 mg [162]. As expected, baseline LDL-C and HDL-C levels, analyzed in quintiles, were strongly predictive (positively and negatively, respectively) of events in the placebo group. In the treated group, the slope of the line relating baseline LDL-C to risk was markedly reduced, indicating the statin had markedly ameliorated LDL-associated risk. In contrast, the slope of the HDL-C line was only slightly reduced indicating a rather modest effect on the HDL-associated risk. This might be expected given that the effect of the statin on LDL was greater (−25% to −28%) than that on HDL-C (5%). Post hoc analysis of data from the Scandinavian Simvastatin Survival Study (4S) by Cox Proportional Hazard suggested an independent benefit of the simvastatin effect on HDL-C, a reduction in risk of 0.8% for each 1% increase [42, 161]. The application of other statistical models also found significant or marginally significant independent benefit arising from the increases in HDL-C. In an additional post hoc analysis of the 4S study, Ballantyne et al. [165] found that the subgroup defined as having HDL-C in the lowest and TG in the highest quartile had the most substantial event reduction.
In order to address this issue with respect to progression or regression of coronary atherosclerosis, Nicholls et al. [166] combined data from four trials that used intravascular ultrasound to measure atheroma volume. In multivariate analyses, as expected, the on-treatment LDL-C was correlated with the atheroma parameters, but the change in HDL-C (but not the on-treatment value) also made a strong independent contribution. Notably, participants who showed lesion regression manifested not only a low on-treatment LDL-C but also an HDL-C increase greater than the overall mean of 7.5%. There are some weaknesses in this post hoc analysis. For example in two of the pooled trials, statin therapy was unrandomized background treatment, all four trials were open-label and there were no placebo groups. Thus, while an association between change in HDL-C and reduced atherosclerosis progression was apparent, a direct, HDL-mediated causal effect of statins cannot be directly inferred. In a meta-analysis of 23 placebo-controlled trials with clinical cardiovascular endpoints, Brown et al. [167] found the best model to describe either change in stenosis or change in event rate involved the simple addition of percentage changes in LDL-C and HDL-C (R 2, 0.93 and 0.96, respectively), but it was not determined if the relationships between these two parameters and stenosis or risk were independent of one another.
With statins, the impact of reduction in the apo B-containing lipoproteins on atherosclerosis and cardiovascular events is sure to be greater than that due to any changes in HDL levels. Nevertheless, given the strength and independence of the epidemiologic relationships, it is reasonable to expect that statin-induced elevations in HDL make an independent contribution to benefit. It would be difficult to conceive a clinical outcomes trial that would provide absolute verification of this hypothesis. It would be necessary to compare statins in such a way that LDL-C levels were the same between groups (and equivalent in terms of other potential ‘pleiotropic’ effects), allowing only HDL-C responses to differ. However, as noted earlier, statins increase HDL parameters and lower TG, altering the HDL subpopulations in a way consistent with clinical benefit. The evidence related above lends some support to this hypothesis. Moreover, it is reasonable to expect that the degree of HDL-associated benefit of statins is proportional to the change in HDL levels. It is important therefore to assess statins not only in terms of their capacity to reduce LDL and VLDL but also their respective abilities to raise levels of HDL.

10 Summary and conclusions

The development of statins capable of profound reductions in the levels of apo B-containing atherogenic lipoproteins has been a major advance in cardiovascular medicine. In this respect, the statins have been thoroughly investigated and their within-class differences in, for example, the dose-related effects on LDL-C are well documented [72]. However, in view of the strong relationships between levels of HDL and cardiovascular risk, it is also important to understand the manner and degree of statin effects on these lipoproteins and whether there are important differences between them in this respect. However, most clinical trials of statins have not been set up with such aims in mind and have been underpowered with respect to HDL parameters. The purpose of this review has been to draw together in a systematic way all of the information about changes in HDL available from clinical trials that met certain predefined qualitative and quantitative criteria.
The data from placebo-controlled trials clearly demonstrated that statins induce real increases in both HDL-C and apo A-I. The increases in HDL-C were about twice those of apo A-I, consistent with specialized studies that have demonstrated alterations of HDL subpopulations towards larger more cholesterol-rich forms characteristic of healthy low-risk populations with low TG and high HDL-C. However, the changes in HDL parameters induced by statins are limited in comparison to fibrates and nicotinic acid. Percentage increases are usually greater in those with lower baseline levels. The data from the large morbidity and mortality trials suggested that the statin-induced effects on HDL-C and apo A-I were maintained over time. Moreover, analysis of the covariates of the HDL-C changes observed in these large studies suggested that CETP activity was a key factor that determines those changes. This makes it likely that the main mechanism of the elevations in HDL-C is a reduced rate of transfer of cholesterol from HDL to the apo B-containing lipoproteins consequent on the profound reductions in the latter. In hypercholesterolemic patient populations, the usual starting doses of statins provide increases in HDL-C of between 4% and 10%. There was a tendency for rosuvastatin to elevate HDL-C more than the other statins (atorvastatin, simvastatin, and pravastatin). In contrast to their effects on LDL-C and apo B, statins do not show clear-cut dose-response relationships with respect to HDL-C and apo A-I. However, further analysis of the largest dose–response study did indicate that the degree of change in HDL-C was partly related to the degree of reduction in TG and LDL-C, consistent with the suggested CETP-related mechanism. However, atorvastatin was a notable exception, in that there was an inverse dose-relationship with diminishing effects on HDL parameters with increasing dose. Comparisons at the highest clinical doses consistently showed atorvastatin to have the least effect on HDL parameters compared with the other three statins. In patients with mixed dyslipidemia, having high TG and low HDL-C as well as elevated LDL-C, statins induce more substantial percentage increases, and a combination of statin and fibrate provides optimal normalization of lipoprotein levels, including HDL.
The main cardiovascular benefits of statins are undoubtedly due to the major reductions of LDL and the other atherogenic lipoproteins. However, it is reasonable to suggest that increases in HDL may also make a valuable contribution to benefit since some of the data from the morbidity and mortality trials, as well as from imaging studies support this hypothesis. However, the independent contributions of the changes induced by statins on LDL and HDL remains an area that requires further study and clarification.

Acknowledgements

We thank Catherine Harmston and Carl Felton, from Prime Medica Ltd., who provided medical writing support funded by AstraZeneca.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://​creativecommons.​org/​licenses/​by-nc/​2.​0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Metadaten
Titel
Effects of Statins on High-Density Lipoproteins: A Potential Contribution to Cardiovascular Benefit
verfasst von
Fergus McTaggart
Peter Jones
Publikationsdatum
01.08.2008
Verlag
Springer US
Erschienen in
Cardiovascular Drugs and Therapy / Ausgabe 4/2008
Print ISSN: 0920-3206
Elektronische ISSN: 1573-7241
DOI
https://doi.org/10.1007/s10557-008-6113-z

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