title: Leukocyte removal filter-passed lymphocytes produce large amounts of interleukin-4 in immunotherapy for inflammatory bowel disease: role of bystander suppression.
abstract: To determine immunosuppression by leukocytapheresis, we studied the immune profiles of filter-passed lymphocytes (FPLs) in patients with ulcerative colitis. These patients were treated with a leukocytapheresis (LCAP) filter of granulocyte apheresis (GCAP) column. Cytokine profiles or FPLs and peripheral blood mononuclear cells (PBMCs) were examined using interleukin (IL)-4 and interferon-gamma (IFN-gamma) immunoassay with lectin stimulation. The IL-4 production of LCAP FPLs was significantly higher than in prefilter PBMCs and GCAP column-passed lymphocytes (median: 540 pg/ml x 10(6) cells versus 4.7 and 2.9, respectively, p = 0.001). IL-4 production in PBMCs was increased after LCAP. IFN-gamma production was not increased in the FPLs. The IL-4 immune deviation was not shown in the patients treated with GCAP. LCAP FPLs showed increased CD4+DR- cells and decreases CD4+DR+ cells in comparison to PBMCs. LCAP FPLs could produce IL-4 and may lead to bystander suppression.
authors.affiliation: Third Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Noguchi
authors.forename: N
authors.initials: N
authors.lastname: Hiwatashi
authors.forename: T
authors.initials: T
authors.lastname: Hayakawa
authors.forename: T
authors.initials: T
authors.lastname: Toyota
mesh_terms: D000328:Adult; D003093:Colitis, Ulcerative / Q000628:therapy*; D005260:Female; D005434:Flow Cytometry; D006098:Granulocytes / Q000378:metabolism; D006801:Humans; D007165:Immunosuppression Therapy; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis*; D007937:Leukapheresis; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D008297:Male; D011446:Prospective Studies; D013601:T-Lymphocytes / Q000378:metabolism*
chemical_list: D015847:Interleukin-4; D007371:Interferon-gamma