Therapeutic leukocytapheresis for inflammatory bowel disease

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Abstract

The inference that granulocytes and monocytes/macrophages (GM) are part of the immunopathogenesis of inflammatory bowel disease (IBD) and hence should be targets of therapy stems from observations of elevated, and activated GM in patients with IBD. The Adacolumn can selectively deplete GM by adsorption (GMA) and in patients with IBD, GMA has been associated with significant clinical efficacy together with sustained suppression of inflammatory cytokine profiles. Additionally, GMA depleted proinflammatory CD14+CD16+ monocytes and was followed by an increase in CD4+ T lymphocytes including the regulatory CD4+CD25high+Foxp3 phenotype. Hence, GMA could be a non-pharmacologic therapy for IBD with potential to spare steroids and other unsafe pharmacologic preparations.

Section snippets

Inflammatory bowel disease

Inflammatory bowel disease (IBD) like ulcerative colitis (UC) and Crohn’s disease (CD) is a debilitating chronic relapsing-remitting disorder that afflicts millions of individuals throughout the world and produces symptoms which impair ability to function and quality of life. UC is confined primarily to the colon and the rectum, while CD can affect any part of the gut from the mouth to the perianal region; up to 65% of patients with CD have the disease affecting the small intestine [1], [2].

Peripheral blood leukocytes in IBD

Blood leukocytes are best known for their role in the defense of the body against pathogens as well as against certain diseases like cancer. However, leukocytes when activated show an amazing plasticity with respect to the diversity of their function and its magnitude. Further, as seen in Fig. 1, patients with active IBD may harbour elevated peripheral neutrophils [14] in the presence of compromised lymphocytes [15], [16], [17]. Additionally, in IBD, neutrophils show activation behaviour [18]

Effects of Adacolumn on peripheral blood leukocytes

The Adacolumn is filled with cellulose acetate beads of 2 mm in diameter as the column leukocytapheresis carriers; the beads are bathed in physiologic saline [14]. The carriers remove from blood in the column most of the granulocytes (neutrophils, eosinophils and basophils) and the monocytes/macrophages together with some platelets; lymphocytes are spared (Fig. 2). In fact lymphocytes increase (Fig. 1) [14], [16], [17]. The merits of sparing lymphocytes are discussed below. The Adacolumn is an

Clinical efficacy associated with Adacolumn in patients with UC

In Japan, the Adacolumn was approved by the Ministry of Health in April 2000 for the treatment of UC. Further, Adacolumn is CE marked [14] and therefore it is available in the EU countries for clinical application. In recent years, there has been an evolution of reports (reviewed in Ref. [31]) mainly from Japan and also from Europe on the clinical efficacy of Adacolumn in patients with IBD. The clinical data show that GMA in patients with steroid dependent or steroid refractory UC was

GMA in the treatment of patients with Crohn’s disease

Most of the published studies so far have reported on the efficacy of GMA in patients with UC [14], [16], [17], [30], [31], [32], [33], [34], [35], [36], [37], [38]. However, GMA seems to produce significant efficacy in patients with active CD as well [39], [40], [41], [42]. The first study in CD was reported by Matsui et al. [41] on seven patients who were refractory to standard medications, each received five GMA sessions. Five of seven patients achieved remission. Subsequently, Fukuda et al.

Searching for the most effective dosage of GMA

Needless to say that the evolution of modern medicine has relied on the outcomes of clinical trials to determine the dosage of drugs with maximum efficacy margin and minimum adverse effect. Fortunately for GMA, which is a non-drug treatment strategy, reliance on clinical trial outcomes has been less demanding or at least lack of it has not caused serious side effects. Nonetheless, it is natural that knowing the most effective frequency and the number of GMA sessions for patients with mild,

Knowing the best responders to GMA

Available data suggest that steroid naive patients respond particularly well to GMA [16], [32], [44]. Characteristically they respond faster with fewer GMA sessions and have a higher cumulative rate of remission [16], [31], [44]. Thus, the remission rate in a cohort of 20 steroid naïve patients reported by Suzuki et al. [16] was an 85%. Similarly, Tanaka et al. [44] treated a cohort of 45 patients, 26 steroid naive and 19 steroid dependent. Each patient could receive up to a maximum of 11 GMA

GMA for suppressing clinical relapse

To prevent a disease episode from flaring up has obvious advantages. Firstly, morbidity is intercepted and secondly, medical care during early stages of the flare up is spared. Based on this thinking, Bjarnason el al. [45] at GKT in London identified patients at a high risk of clinical relapse on the basis of a very high faecal calprotectin level, a neutrophil selective protein that provides quantitative measure of intestinal neutrophil level and inflammation [22]. This study, randomly assigned

Immunomodulation associated with Adacolumn GMA

The Adacolumn depletes excess peripheral granulocytes and monocytes/macrophages. However, the clinical efficacy associated with a course of GMA is unlikely to reflect its effects on peripheral leukocytes per se. Accordingly, it is inferred that additional mechanisms of actions might follow a course of GMA. As reviewed above, leukocytes that bear the FcγR and complement receptors adhere to the GMA carriers [29], [30]. The adsorbed leukocytes release an array of substances both toxic and

The merits of sparing lymphocytes in IBD

To say that currently, the circulating level and functions of a subpopulation of T lymphocytes, CD4+CD25+ expressing Foxp3 (CD4+CD25+Foxp3+) define IBD better than any other immunologic marker is not an over statement. The CD4+CD25+ phenotype is known as naturally arising regulatory T cell (Treg) and any pharmacologic preparation that can increase the frequency of the CD4+CD25+ phenotype is believed to have an unparallel impact on the treatment of IBD [56], [57], [58], [59]. Functional CD4+CD25+

Concluding remarks

Patients with IBD have activated granulocytes and monocytes/macrophages, which are thought to be major factors in the exacerbation and perpetuation of the disease and warrant to be targets of therapy. In line with this understanding, GMA in patients with IBD has been associated with significant clinical efficacy together with a sustained suppression of specific inflammatory profiles including TNF-α and the proinflammatory CD14+CD16+ phenotype. Further, GMA has been followed by an increase in

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    Presented at the XXXIII Congress of the European Society for Artificial Organs (ESAO) and the European Society for Haemapheresis (ESFH) held in Umea, Sweden, 21–24 June 2006.

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