Eosinophils in Inflammatory Bowel Disease

Eosinophils in Inflammatory Bowel Disease

US Gastroenterology Review 2007 - Issue I - March 2007
Published: October 2008
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The etiology and pathogenesis of inflammatory bowel disease (IBD) is still unclear. It is generally believed that IBD results from abnormal interactions between gut microflora and the deregulated host’s immune response in genetically susceptible individuals.1–3 There is an increase in the number of inflammatory cells in inflamed gut mucosa in patients with IBD, including plasma cells, T-lymphocytes, macrophages, mast cells, neutrophils, and eosinophils. Accumulated evidence suggests that eosinophils play an important role in IBD. Histopathological observations demonstrate eosinophils and their related proteins in increased quantities in the mucosa of IBD patients. Accumulation of eosinophils is also seen in asthma, allergy, parasitic infections, and certain neoplasms.4 While the pathogenetic role of eosinophils in allergy4 and asthma5 has been extensively studied, the contribution of these cells in the pathogenesis of IBD is still under investigation and remains controversial.

Clinical Evidence of the Diagnostic and Prognostic Values of Eosinophils in IBD
An increased number of eosinophils have been found in the gut mucosa and luminal exudates in patients with IBD6–10 as compared with healthy individuals.11,12 Further studies have shown that exacerbations of ulcerative colitis (UC) are frequently accompanied by an increase in the number of circulating eosinophils and tissue eosinophilia,13 and an elevated eosinophil count may precede relapse.14 These eosinophils in the inflamed mucosa are largely degranulated on electronic microscopy.15

The diagnostic and prognostic roles of tissue eosinophilia in IBD are still debatable. Clinical investigations have been performed to assess association between eosinophil infiltration and disease activity. Sarin et al.16 showed rectal eosinophilic cell counts to be significantly higher in active UC than in quiescent UC and healthy controls, but there was no correlation between the eosinophil cell counts and disease severity. Jeziorska et al.17 reported an increased number of eosinophils only in active IBD, while much less in chronic quiescent disease. In contrast, Korelitz et al.18 described low mucosal eosinophil counts in active untreated UC. There was no correlation between the number of eosinophil in lamina propria and treatment response to sulfasalazine. The presence of tissue eosinophils corresponded to the general tendency for the condition to deteriorate and require intense medical therapy. Lampinen et al.19 further established that the activity of eosinophils was high in active disease. During this inactive phase of UC, patients had a higher number of eosinophils while being asymptomatic both clinically and histopathologically. These observations have sparked even more controversy, implying eosinophils might be involved also in the resolution of inflammation and repair of damaged tissue, which has also been elicited in allergy and asthma.20,21

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