Introduction
Heart failure is a global medical problem and complex clinical syndrome, which is the last stage of various cardiovascular diseases, especially ischemic heart disease [
1]. Due to chronic nutrient deficiency and hypoxia in the heart, dysfunctional cardiomyocytes contribute to myocardial necrosis, thereby ensuing myocardial inflammation, hypertrophy, and fibrosis, all of which act as the foundation of HF development [
2]. Contemporarily, the main therapeutic drugs have limited symptomatic relief and serious adverse reactions during long-term clinical treatment, so far, the drug treatment of HF is far from sufficiency.
The increasing fatality of obesity complications such as cardiovascular diseases and the like has brought widespread attention to the research aimed at understanding the potential molecular mechanisms by which obesity contributes to the development of ischemic heart disease [
3]. Adipose tissue, an endocrine organ, secreted various adipokines such as adiponectin, leptin, resistin, and the rest, which could directly affect the surrounding or remote tissues and were closely associated with the increased risk of HF [
4]. Omentin, a novel circulating adipokine, is widely expressed in human omental and visceral adipose tissue. Clinical studies have found that serum omentin1 significantly decreased in patients with coronary artery disease, and could be served as a novel prognostic indicator of risk stratification in HF patients [
5,
6]. Moreover, previous studies have demonstrated that omentin could attenuate myocardial ischemia reperfusion injury (MIRI) through AMPK- and Akt-dependent mechanisms [
7], and it also attenuated glucocorticoid excess-induced cardiac injury through activation of GSK3β pathway [
8]. Furthermore, omentin could ameliorate doxorubicin-induced H9c2 cell apoptosis [
9]. Similarly, most cross-sectional studies reported that the circulating omentin1 levels were lower in patients with ischemic stroke, metabolic syndrome, or type 2 diabetes compared with subjects without cardiovascular diseases [
10‐
12]. All of these are consistent with observations from several studies that omentin1 levels were inversely associated with multiple cardiovascular risk factors including BMI, age, waist circumference, insulin resistance, glucose levels, and lipid levels [
13,
14]. In contrast, longitudinal studies have observed that higher omentin1 concentrations were connected with a higher risk of cardiovascular events in diabetes patients and with a higher risk of stroke in healthy individuals [
15,
16]. However, the reasons for such discrepant findings are unclear, demonstrating that the biological roles of omentin1 in cardiovascular biology are hardly understood. Therefore, we firstly investigated the effects of omentin1 in the therapy for HF, and further clarified its potential mechanism, which could provide new strategies for the prevention and therapy of HF from crosstalk between the heart and adipose tissue.
Mitochondrial homeostasis is regulated by mitochondrial dynamics and mitophagy, which preserve organelle structure and function. Mitochondrial fission irreversibly separates damaged mitochondria, forming small sphere-shaped organelles. Conversely, Mitochondrial fusion occurs in the dynamic repair of reversible mitochondrial damage, forming functional elongated organelles [
17]. Mitophagy is essential for sustaining mitochondrial homeostasis by clearing away defective mitochondria, while it may contribute to cell death if not strictly controlled [
18]. HF, a bioenergetic disease, is characterized by disrupted mitochondrial homeostasis, including impaired ‘myocardial power grid’ and increased mitochondrial ROS (mitoROS) production, which is a therapeutic target for heart failure [
19]. And whether adipocytokine omentin1 released in adipose tissue could exert a myocardial protective effect by acting on the heart and maintaining mitochondrial homeostasis is still worthy of further study.
SIRT3 is a NAD-dependent deacetylase in mitochondria, which regulates the mitochondrial network mainly by regulation of lysine acetylation. SIRT3 could delay the progression of heart failure through improvement of mitochondrial function including mitochondrial quality control, mitochondrial biosynthesis, oxidative phosphorylation, and fatty acid oxidation [
20]. According to previous studies, SIRT3 could alleviate myocardial infarction by inhibiting AMPK-Drp1-mediated mitochondrial fission [
21]. However, SIRT3 deficiency caused hyperacetylation of OPA1, which led to impaired mitochondrial bioenergetics and defective trans-mitochondrial cristae alignment, resulting in cardiac dysfunction [
22]. In addition, SIRT3 could promote mitophagy to improve MIRI through deacetylating FOXO1 and FOXO3a [
23]. Additionally, SIRT3 deficiency further worsened diabetic cardiac dysfunction by inhibiting FOXO3a-PINK1-parkin-mediated mitophagy [
24]. Therefore, regulation of mitochondrial dynamics and mitophagy via SIRT3-FOXO3a signaling is of great importance to effectively improve cardiac function and ameliorate HF.
In this research, the cardioprotective effect of omentin1 released by adipose tissue on HF was investigated in vivo and in vitro, and its potential mechanisms against heart failure were further elucidated, especially focusing on mitochondrial dynamical homeostasis and mitophagy, which might provide new inspirations for the therapy of cardiovascular diseases from the crosstalk between heart and adipose tissue.
Materials and methods
Drugs and reagents
Recombinant human omentin1 protein was purchased from Enzo Life Sciences (New York, USA). 3-TYP, a selective SIRT3 inhibitor, was purchased from MedChemExpress (Shanghai, China). MitoTracker™ Deep Red FM was purchased from Thermo Fisher Scientific (Waltham, MA, USA; lot number: M22426). Mito-SOX red mitochondrial superoxide indicator was purchased from Warbio (Nanjing, China). Methyl thiazolyl tetrazolium (MTT) was purchased from Amresco (Washington, USA). Brain natriuretic peptide (BNP) and omentin assay kits were purchased from jin Yibai Biological Technology Co., Ltd (Nanjing, China). The assay kits of serum lactate dehydrogenase (LDH) and creatine kinase (CK) were purchased from Nanjing Jiancheng Bioengineering Institute (Nanjing, China). Cell or tissue mitochondrial isolation kit, LDH cytotoxicity assay kit, Quickblock™ blocking buffer, and mitochondrial membrane potential assay kit with JC-1 were obtained from Beyotime Biotechnology Institute (Shanghai, China). 2,3,5-Triphenyl tetrazolium chloride (TTC) was obtained from Macklin Biochemical Co., Ltd (Shanghai, China). The following primary antibodies were obtained from Proteintech Group (Wuhan, China): Dynamin-related protein 1 (Drp1, 12,957-1-AP) antibody, Optic atrophy 1 (OPA1, 27,733-1-AP) antibody, PTEN-induced putative kinase 1 (PINK1, 232,741-AP) antibody, Sirtuin 4 (SIRT4, 66,543-1-Ig) and Sirtuin 5 (SIRT5, 15,122-1-AP). Antibodies against E3 ubiquitin ligase (Parkin, SC-32282) and Sirtuin 3 (SIRT3, SC-365175) were purchased from Santa Cruz Biotechnology (Shanghai, China). Antibodies against sequestosome 1 (p62, ab109012) and voltage-dependent anion channels (VDAC, ab154856) were obtained from Abcam (Cambridge, MA, USA). Antibodies against mitofusin 2 (Mfn2, 9482S), phospho-Drp1 (Ser616) (p-Drp1, 3455S) and forkhead box O3a (FOXO3a, 2497S) were obtained from Cell Signaling Technology (Boston, MA, USA). Antibody against INTL1 (omentin1) (DF12413) was purchased from Affinity Biosciences (Nanjing, China). Antibody against β-actin (200,068-8F10) was purchased from ZenBio (Chengdu, China).
Ethics statements
All animal experiments were conducted in accordance with the ethical policies and all experimental procedures were approved by the Animal Ethics Committee of China Pharmaceutical University and the Laboratory Animal Management Committee of Jiangsu Province (Approval No. 220193566).
Clinical serum samples were obtained from the Jiangsu Province Hospital of Traditional Chinese Medicine. Informed consent was obtained from all human research participants (No. 2019NL-089-02).
Human samples
A total of 23 heart failure (HF) patients and 23 healthy subjects were selected from the Jiangsu Province Hospital of Traditional Chinese Medicine. A clinician comprehensively evaluated the results of electrocardiography, echocardiography and BNP (HF associated biochemical indexes) to screen out clinical HF patients. Informed consent was obtained from all human research participants and this study was guided by the Helsinki Declaration (No. 2019NL-089-02). The characteristics of heart failure patients and healthy subjects were shown in Additional file
1: Table S1.
Animals and animal models
ICR male mice (22–24 g) were purchased from the Yangzhou University (Jiangsu, China, certificate NO. 202012586). The animals were housed in a standard space with enough food and water. The HF model induced by prolonged myocardial ischemia (MI) was constructed by ligating the left anterior descending coronary artery for 2 weeks as previously described [
25]. The successful mouse model of myocardial ischemia was confirmed by ST-segment elevation on the electrocardiography. Sham-operated mice underwent the same surgical procedures without ligation. Mice were anesthetized with isoflurane. Mice were randomized into four groups (
n = 8/group): (i) sham group (AAV-NC, 2E*10
11 vg/mice, i.v.); (ii) model group (AAV-NC, 2E*10
11 vg/mice, i.v.); (iii) sham + omentin1 group (AAV-omentin1, 2E*10
11 vg/mice, i.v.); (iv) model + omentin1 group (AAV-omentin1, 2E*10
11 vg/mice, i.v.). All AAV were intravenously injected into mice 2 weeks before CAL. And the mice were euthanized with overdose of carbon dioxide, then heart tissues were collected 2 weeks after CAL.
Construction and infection of recombinant human AAV-omentin1
Adeno-associated virus (AAV) vectors with fat-specific promoters PTKAA (GPAAV-PTKAA-WPRE) carrying human omentin1 (AAV-omentin1) (24,538) or negative control (AAV-NC) (24537GO-AAV) were constructed by Genomeditech company (Shanghai, China). For in vivo infection, Mice were injected with AAV-omentin1 or AAV-NC (2E*1011 vg/mice) via the tail vein. 2 weeks later, sham surgery and coronary artery ligation (CAL) surgery were performed. The efficiency of gene transfer into adipose tissue via AAV was determined by fluorescence assay.
TTC staining
The hearts were rapidly removed and perfused with PBS 2 weeks after CAL, and then cut into five slices perpendicular to the long axis of the heart. The slices of hearts were incubated in 1% TTC solution at 37 °C for 15 min and pictured timely. The red area of the heart stained by TTC represented viable tissue, and the staining negative areas represented infarct myocardium. The infarct areas were analyzed through Image J software (Bethesda Md, USA).
Cardiac hypertrophy
The hearts were rapidly removed 2 weeks after CAL. Then the hearts were cleaned with PBS and pictured timely.
Echocardiography
2 weeks after CAL, the measurement of echocardiography was performed through Vevo 3100LT system (Visual Sonics, Toronto, Canada). The following parameters were measured: left ventricle interior diameter in diastole (LVIDd), left ventricle interior diameter in systole (LVIDs), left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), left ventricle volume diastole (LV Vold), left ventricle volume systole (LV Vols), left ventricle posterior wall in diastole (LVPWd), interventricular septum in diastole (IVSd). Based on these measurements, the following parameters were calculated as cardiac function indicators: left ventricular fractional shortening (LV FS) = (LVIDd—LVIDs) / LVIDd; left ventricular ejection fraction (LV EF) = (LVEDV—LVESV) / LVEDV; stroke volume (SV) = (LV Vold—LV Vols). The following parameters were calculated as cardiac hypertrophy indicators: left ventricular mass (LV Mass) = 1.053 × [(LV Vold + LVPWd + IVSd)
3—LV Vold
3]; relative wall thickness (RWT) = 2 × (LVPWd / LVIDd) [
26].
Enzyme-linked immunosorbent assay (ELISA)
The blood samples were collected by puncture of the retro-orbital venous plexus of mice 2 weeks after CAL and centrifuged at 3500 rpm for 11 min to isolate serum samples. The contents of CK, BNP, and omentin1 were measured using commercial kits in accordance with the manufacturer´s instructions. The ELISA assay kits of BNP and omentin1 were purchased from jin Yibai Biological Technology Co., Ltd (Nanjing, China). The assay kit of CK was purchased from Nanjing Jiancheng Bioengineering Institute (Nanjing, China).
Histopathologic examination
The heart tissues of mice were fixed in 10% buffered paraformaldehyde solution for 25 h, embedded in paraffin, and sliced into pieces (4–5 μm thick). Then, the heart sections were stained with Masson´s trichrome or hematoxylin–eosin (H&E) and pictured timely, which were used to observe the degree of myocardial fibrosis and histopathological damage, respectively. The myocardial fibrosis was analyzed through quantification of blue-stained collagen using Image J software (Bethesda Md, USA). The criteria of pathology score of mouse heart were as follows [
27]: 0 nil, intact and arranged neatly myocardial fibers, regular myocardial cells, and no inflammatory infiltration; 1–2 minimum, focal myocytes damage; 2–3 mild, small multifocal degeneration and slight inflammatory infiltration; 3–4 moderate, extensive myofibrillar degeneration, moderate cellular damage and inflammatory infiltration; 4–6 severe, massive myofibrillar degeneration and myocardial necrosis, nucleus shrinks, diffuse inflammatory cell infiltration. To avoid subjective bias causing errors, the pathologists who examined tissue slices were blind to the heart samples.
Transmission electron microscopy
The heart tissues of mice were fixed with glutaraldehyde for 4 h. Then they were post-fixed with 0.1 mol/L cacodylate buffer with 1% osmium for 1 h, dehydrated in graded series of acetone, and lastly embedded in epoxy resin. The ultrathin sample was prepared and the ultrastructure of mice heart tissues was investigated through transmission electron microscopy (HT7800, Hitachi Ltd, Tokyo, Japan).
Evaluation of mitophagy and damaged mitochondria
Mitochondria are made of five distinct parts: the outer mitochondrial membrane, the inner mitochondrial membrane, intermembrane space, cristae space, and mitochondrial matrix. The morphology of mitochondrial cristae directly reflects the health of the mitochondrion. The morphological appearances of healthy mitochondria are intact and sharply defined membranes and numerous and regular cristae. The morphological appearance of swollen mitochondria is warped membranes and disintegrated or swollen cristae. The morphological appearances of vacuolar mitochondria are delamination of the inner and outer mitochondrial membranes and absent cristae. Damaged mitochondria were assessed by calculating the ratio of vacuolar or swollen mitochondria to total mitochondria in the image. The initiation of mitophagy includes the formation and expansion of the phagophore, the initial sequestering compartment, which expands into a mitophagosome. Mitophagy was assessed by calculating the ratio of mitophagosome to total mitochondria in the image [
28].
Immunohistochemistry
The heart tissues of mice were acquired 2 weeks after the CAL, immersed in paraformaldehyde, embedded in paraffin, sliced into pieces (4–5 μm thick), deparaffinized, and incubated with 3% hydrogen peroxide. Then heart sections of mice were incubated for 1 h using quick-block liquid. Primary antibodies of Mfn2, OPA1, P-Drp1(Ser616), PINK1, Parkin and SIRT3 were added to the heart sections overnight at 4 °C. The heart sections of mice were maintained with the HRP-conjugated secondary antibodies at 1:200 dilution (Biogot Technology, Nanjing, China) for 1 h. After incubation with DAB and counterstained with hematoxylin, a NanoZoomer 2.0 RS (Hamamatsu, Japan) was performed to scan the heart section at 400 × magnification.
Cell preparation and culture
Rat H9c2 cells were got from the Shanghai Institute of Cell Biology, Chinese Academy of Science (Shanghai, China) and sustained in Dulbecco’s modified Eagle medium (DMEM) containing 100 U/mL penicillin, 100 μg/mL streptomycin and 10% fetal bovine serum in a humidified atmosphere of 5% CO2 at 37 °C. Passage 3–10 of cells were used, and were subjected to experiments at 85–90% confluence.
OGD injury model
To mimic the heart failure model in vitro, oxygen glucose deprivation (OGD)-injured cell model was conducted based on a previous study [
29]. The OGD-injured cells were generated by maintaining cells with glucose-free DMEM and a hypoxic environment of 94% N
2, 5% CO
2, and 1% O
2 for 12 h in a humidified N
2/CO
2 incubator at 37 °C. Meanwhile, H9c2 cells were administrated with omentin1 (300 ng/mL) or 3-TYP (50 μM) during hypoxia.
Measurement of cell viability and LDH
H9c2 cells were seeded in a 96-well plate at a density of 5500 cells/well. Next day, after different treatments, cell viability was determined using MTT assays as reported previously [
29]. The release of LDH was also measured to further evaluate the degree of cell injury. After the incubation period, the culture supernatants of H9c2 cells were used to measure the activity of LDH in compliance with the manufacturer’s instructions.
Determination of mitochondrial membrane potential (ΔψM)
The changes in mitochondrial transmembrane potential were analyzed using 5,5′,6,6′-Tetrachloro-1,1′,3,3′-tetraethylbenzimidazolyl-carbocyanine iodide (JC-1, BD). After various treatments, the H9c2 cells were incubated with JC-1 in darkness at 37 °C for 20 min. The ΔψM dissipation was indicated by the intensity of green fluorescence emitted by JC-1 monomers. However, the intact ΔψM was represented by the red fluorescence intensity emitted by JC-1 aggregates. The fluorescence intensity was monitored through confocal laser scanning microscopy (CLSM, LSM700, Zeiss, Germany).
Determination of mitochondrial ROS (mitoROS)
Mito-SOX red mitochondrial superoxide indicator was used to analyze the generation of mitochondrial ROS. After various treatments, the H9c2 cells were incubated with Mito-SOX red mitochondrial superoxide indicator in darkness at 37 °C for 10 min. The mitoROS was viewed using confocal laser scanning microscopy (CLSM, LSM700, Zeiss, Germany).
Immunofluorescence staining
The heart slices of mice were fixed in paraformaldehyde, permeabilized with 0.1% Triton X-100 in PBS, blocked with 5% BSA, and incubated with a rabbit FOXO3a antibody (1:100) overnight. The H9c2 cells were maintained with MitoTracker® Deep Red (Molecular Probes) for 30 min, and then fixed, permeabilized and maintained with primary antibody against Parkin, PINK1, Mfn2, OPA1, p-Drp1(Ser616) and SIRT3 followed by incubation with corresponding fluorescent secondary antibodies and 4´,6-Diamidino-2-phenylindole (DAPI, Beyotime, Shanghai, China). Immunostaining was visualized using confocal laser scanning microscopy (CLSM, LSM700, Zeiss, Germany).
Mitochondria isolation
Fresh minced heart tissues were cleaned with PBS, digested with trypsin to disperse tissues, and centrifuged at 600 g for 10 s to obtain precipitation. Similarly, H9c2 cells were collected by digestion with trypsin–EDTA solution and cleaned with PBS. Thereafter, the acquired tissue precipitation and collected cells were homogenized in mitochondrial separation reagent using glass homogenizer and centrifuged at 600 g for 5 min to gain supernatant, and then the supernatant was centrifuged at 11,000 g for 10 min to gain mitochondrial precipitation. Furthermore, mitochondrial precipitation was resuspended and cleaved to get mitochondrial protein using mitochondrial lysate. Finally, the concentration of mitochondrial proteins was quantified using a BCA assay kit.
Western blot analysis
As reported [
29], in 1 mM PMSF ice-cold RIPA buffer, cells were lysed and the heart tissues acquired from the margin of infarction areas were homogenized. Proteins were acquired by centrifugation at 12,000 rpm for 10 min. Thereafter, the concentration of total proteins was quantified using a BCA assay kit. Equal amount of proteins (40 μg) was separated by denaturing SDS/PAGE and transferred to PVDF membranes by electroblotting. The membranes were blocked with quick-block buffer and incubated with primary antibodies against Parkin, PINK1, p62, Mfn2, OPA1, p-Drp1(Ser616), Drp1, FOXO3a, SIRT3, SIRT4, SIRT5, β-actin and VDAC overnight, Then, the membranes were immersed in corresponding secondary antibodies for 2 h. To quantify the expression of proteins, the protein signal was detected with the ECL plus system. The bands were visualized by a ChemiDoc™ MP System (Bio-Rad), after which band density was measured by ImageJ software (Bethesda Md, USA).
Statistical analysis
Statistical analysis was performed by GraphPad Prism 8 (La Jolla, CA, USA) software. Student’s two-tailed t-test and one-way analysis of variance (ANOVA) followed by Dunnett’s test were used to comparisons between two groups and among three or more groups respectively. P values of < 0.05 were considered significant.
Discussion
Heart failure is characterized by high morbidity and mortality worldwide, which is caused by the long-term insufficient blood supply to heart induced by coronary heart disease, myocardial infarction, obesity and the like, and it is the end-stage of various diseases. With the development of system biology, it would be more effective to treat complex multi-factorial diseases from the perspective of tissue crosstalk. Adipose tissue, as crucial energy storage and endocrine organ, not only provides energy but also secretes multiple adipocytokines, such as adiponectin, resistin and the like, to regulate various metabolic tissues. Additionally, the dysfunction of adipose tissue in the synthesis or release of adipocytokines could induce the underlying pathogenesis of both obesity and HF [
31]. Simultaneously, hypoxic adipose tissue altered adipocytokine secretion, caused skeletal muscle atrophy, cardiovascular remodeling and endothelial dysfunction, and developed ultimately HF [
32].
Omentin, an adipokine expressed by adipose tissue and released into the bloodstream, was found to provide certain therapeutic effects on complex diseases such as osteoporosis, acute lung injury, arterial calcification, and MI/R injury [
14]. The majority of experimental studies have pointed to favorable effects of omentin on cardiometabolic risk. Preclinical studies demonstrated that omentin prevented the activation and senescence of vascular endothelial cells [
33], diminished the calcification and proliferation of vascular smooth muscle cells [
34], curbed macrophage infiltration and foam cell formation [
35], and maintained cardiomyocyte function to promote cardiovascular health by improving cardiac vasorelaxation and preventing atherosclerosis [
36,
37]. Consistent with the preclinical studies, circulating omentin1 concentration was increased by improving insulin sensitivity after weight loss, and circulating omentin1 levels were inversely connected with atherosclerosis, carotid plaque, and left ventricular diastolic function [
38,
39]. However, in contrast to the above studies, prospective studies demonstrated that higher omentin1 concentrations were connected with increased cardiovascular risk in diabetes patients and angiographied coronary patients [
15,
40]. All of these showed that molecular interactions between omentin1 and cardiovascular risk factors are complex. Elevated omentin levels in individuals at high risk of cardiovascular events could reflect a counter regulatory mechanism. Omentin might be upregulated in response to metabolic and inflammatory stimuli that contributed to atherogenesis [
15]. Therefore, the biological effects of omentin1 on different cardiovascular diseases under different metabolic conditions need to be further studied. Whereas, the improvement of omentin1 on cardiac function and HF is not yet clear, and its potential mechanism still needs to be further elucidated. In the present study, clinically, the serum omentin1 level was down-regulated in HF patients compared with healthy subjects. Increased circulating omentin1 level via fat-specific overexpression observably ameliorated cardiac function, cardiac hypertrophy, infarct size and cardiac pathological features in HF mice. And treatment with recombinant human omentin1 protein markedly enhanced OGD-injured cardiomyocytes viability and mitochondrial membrane potential (ΔψM), and restrained LDH release and the generation of mitoROS.
It is known that prolonged MI can provoke mitochondrial damage, and mitochondrial homeostasis is disrupted during the development of HF, which leads to inadequate supplement of ATP and destruction of the cellular energy network [
41]. Therefore, controlling mitochondrial quality through periodically mitochondrial fusion, fission and mitophagy is the key to maintaining mitochondrial homeostasis [
42]. Mitochondrial dynamics is important to compensate mitochondrial damage and to eliminate irreparably damaged mitochondria through mitochondrial fusion and fission, respectively, and its disorders are implicated in neoplastic, endocrine, neurodegenerative and cardiovascular diseases [
43]. Mitochondrial fission is regulated by Drp1, cytoplasmic guanosine triphosphatases (GTPases) which translocates to the outer mitochondrial membrane (OMM) upon phosphorylation of serine 616 [
44]. Studies have shown that I/R injury led to cardiomyocyte death through the enhancement of mitochondrial fission mediated by p-Drp1(Ser616) and oxidative stress injury [
45]. Moreover, pharmacological inhibition of the Drp1 activation reduced heart infarct areas and protected cardiomyocytes against MI injury [
46]. Mitochondrial fusion is accomplished by cooperative work of Mfn1 and Mfn2 which are located in OMM and orchestrate OMM fusion. While optic atrophy1 (OPA1) is located in the inner mitochondrial membrane (IMM), which is required for IMM fusion [
47]. Previous studies have proved that mitochondrial fusion is essential for the maintenance of normal mitochondrial morphology, respiratory and contractile functions of the adult heart [
48]. Similarly, deficiency of Mfn2 leads to depletion of mitochondrial coenzyme Q, which impairs the capacity of the mitochondrial respiratory chain [
49]. Additionally, since mitochondrial fusion is only dependent on the longer OPA1 form (L-OPA1) and mitochondrial fission is related to the shorter OPA1 form (S-OPA1), the balanced accumulation of both OPA1 forms serves as the center for coordinating mitochondrial fusion, fission, and sustaining normal mitochondrial morphology [
50,
51]. Several studies have reported that the level of OPA1 was diminished in heart samples of both rats with HF, accompanied by smaller and fragmented mitochondria [
52]. However, the mild overexpression of OPA1 attenuated heart I/R injury, denervation-induced muscular atrophy, and the susceptibility of Fas-induced liver injury through the resistance of mitochondrial apoptotic cristae remodeling [
53]. In our present study, fat-specific human omentin1 overexpression and administration of recombinant human omentin1 protein increased mitochondrial fusion and decreased mitochondrial fission, thus remarkably improving damaged mitochondria morphology and unbalanced mitochondrial fusion-fission dynamics in HF mice and OGD-injured cardiomyocytes.
Mitophagy, selective autophagy specific to the degradation of mitochondria, is vital for mitochondrial quality control [
54]. The best-characterized pathway of mitophagy is PINK1/Parkin signaling. A study has shown that the PINK1/Parkin-mediated mitophagy was inhibited in advanced dystrophic cardiomyopathy [
55]. Being subsistent in the cytosol at baseline conditions, Parkin rapidly translocates into OMM and ubiquitinates several targets on damaged mitochondria when mitochondria lose membrane potential. Then p62, a ubiquitin-binding protein, binds ubiquitinated proteins to LC3, which promotes the isolation of damaged mitochondria into the autophagosome [
56]. Multiple studies have demonstrated that mice deficient in PINK1 are more susceptible to HF under cardiac stress overload and heart I/R injury [
57]. In our present study, fat-specific omentin1 overexpression augmented the expression of mito-Parkin, mito-PINK1 and restraint of mito-p62 expression, accompanied by the increased number of mitophagosomes in HF mice
. Simultaneously, omentin1 enhanced the expression and localization of Parkin and PINK1 at mitochondria in OGD-injured cardiomyocytes. Taken together, omentin1 promoted PINK1/Parkin-dependent mitophagy and controlled mitochondrial quality.
SIRT3, a mitochondrial energy sensor, is regulated by metabolic co-factor NAD
+ and nicotinamide [
58]. Meanwhile, SIRT3 sustains mitochondrial homeostasis through regulating acetylation modification of its substrates which are involved in the comprehensive field of mitochondrial biological function [
59]. Transcribed in the nucleus, inactive SIRT3 is proteolytically cleaved to the active form when it is translocated into mitochondria [
60]. As a guardian of mitochondrial homeostasis, the deficiency of SIRT3 destroyed the systolic function of heart [
61]. Besides, in heart failure, the downregulation of SIRT3 disturbed oxidative phosphorylation and resulted in the energy metabolism imbalance of cardiomyocytes [
62]. Furthermore, the SIRT3 substrate FOXO3a regulated apoptosis and mitophagy, and SIRT3 activated its activity and nuclear translocation, thereby enhancing antioxidant defense against cardiac hypertrophy [
63]. Another major regulator of mitochondrial homeostasis is mammalian target of rapamycin (mTOR) which is involved in many cellular processes, such as cell growth, metabolism, proliferation, and apoptosis [
64]. mTOR controlled mitochondrial biogenesis and respiration via stimulating expression of mitochondrial proteins and inhibited mitochondrial degradation by suppressing autophagy [
65]. Meanwhile, mTOR stimulated mitochondrial fission through MTFP1, which induced mitochondrial fragmentation, regulated mitochondrial morphology, and controlled cell survival [
66]. In addition, mTOR and AMPK played an important role in balancing cellular energy homeostasis by sensing cellular ATP levels and were key upstream regulators for triggering autophagy [
67]. Therefore, mTOR act as a central regulator of mitochondrial dysfunction. Interestingly, several studies have shown that SIRT3 promoted autophagy by regulating AMPK-mTOR signaling, thereby ameliorating acute kidney injury, ischemic neuronal injury, diabetes and osteoarthritis [
68‐
71]. All of these suggested that SIRT3 might be a key upstream factor regulating mitochondria, and exerted important roles in regulating mitochondrial homeostasis. In our present study, human omentin1 enhanced the expression of SIRT3, FOXO3a, and the colocalization of SIRT3 and FOXO3a with mitochondria and nucleus, respectively, in HF mice and OGD-injured cardiomyocytes. Nevertheless, 3-TYP, a selective SIRT3 inhibitor, dampened omentin1-induced upregulation of FOXO3a and nucleus transduction of FOXO3a, and inhibited the protection of omentin1 on mitochondrial function in OGD-injured cardiomyocytes. Additionally, it also degraded the ameliorative effect of omentin1 on the unbalanced mitochondrial fusion-fission dynamics, as evidenced by the inhibition of mitochondrial fusion and the augment of mitochondrial fission. And the omentin1-induced mitophagy activation was also inhibited by 3-TYP. All of these suggested that SIRT3 participated in the protective effect of omentin1 on mitochondrial homeostasis. Moreover, SIRT3, an important regulator of mitochondrial antioxidant defense mechanism, scavenged mitoROS by stimulating deacetylation of superoxide dismutase 2, thus improving mitochondrial oxidative stress damage including essential hypertension, cardiac fibrosis, and diabetic cardiomyopathy [
72‐
74]. Meanwhile, activation of the SIRT3-FOXO3a pathway could protect mitochondria from oxidative stress, thereby ameliorating lung senescence and neurodegenerative diseases [
75,
76]. Additionally, current knowledge has proved that antioxidant effects were closely related to sufficient mitochondrial biogenesis, that was, the mitoROS production could be reduced by elevating mitochondrial efficiency [
77]. Therefore, omentin1 may improve mitochondrial oxidative stress damage-related diseases through SIRT3-mediated antioxidant pathways and enhanced mitochondrial biogenesis, which will provide novel ideas for the development of antioxidant drugs and elucidation of the association of complex diseases.
However, although the above results have revealed that omentin1 might ameliorate MI-induced HF through sustaining mitochondrial homeostasis via modulating SIRT3/FOXO3a signaling, further confirmation is required using SIRT3-deficient mice. Additionally, we need to further explore how omentin1 promotes the expression of SIRT3 and elucidate its possible acting site on mitochondria.
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