Beta7 integrin deficiency suppresses B cell homing and attenuates chronic ileitis in SAMP1/YitFc mice.

Beta7 integrin deficiency suppresses B cell homing and attenuates chronic ileitis in SAMP1/YitFc mice.
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DOI:
10.4049/jimmunol.0903938
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发表时间:
2010-11-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Ley K
Ley K
中科院分区:
其他
文献类型:
--
作者:
Gorfu G;Rivera-Nieves J;Hoang S;Abbott DW;Arbenz-Smith K;Azar DW;Pizarro TT;Cominelli F;McDuffie M;Ley K

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淋巴细胞向肠组织的募集依赖于β7整合素。在这项研究中,我们研究了SAMP1/YitFc小鼠的疾病严重程度和淋巴细胞募集到小肠的情况,这些小鼠发生了与人类克罗恩病相似的慢性回肠炎。为了评估β7整合素在慢性回肠炎中的作用,我们使用通过标记辅助选择开发的基因菌株产生了缺乏β7整合素的SAMP1/YitFc (SAMP1/YitFc Itgb7−/−)。我们通过组织病理学分析SAMP1/YitFc和SAMP1/YitFc Itgb7−/−小鼠的回肠炎症,并通过流式细胞术分析肠系膜淋巴结(MLNs)中T和B淋巴细胞的分布。采用短期(18 h)过继性转移实验研究T淋巴细胞和B淋巴细胞的体内归巢能力。在年轻(<20周)和老年(20 - 50周)SAMP1/YitFc Itgb7−/−小鼠中,与SAMP1/YitFc小鼠相比,回肠炎减少了30-50%。SAMP1/YitFc Itgb7 - / -小鼠的mln大小急剧减少67%,这是由于淋巴细胞数量减少85%和短期B细胞归巢减少所致。流式细胞术分析显示SAMP1/YitFc Itgb7−/−小鼠MLNs中B细胞百分比显著降低。SAMP1/YitFc MLN B细胞而非SAMP1/YitFc Itgb7−/−MLN B细胞与CD4+ T细胞共转移导致SCID小鼠回肠炎严重程度加重。我们的研究结果表明,β7整合素通过促进疾病恶化的B细胞归巢到mln和其他肠道组织,在体内自发性慢性回肠炎中发挥重要作用。
Lymphocyte recruitment to intestinal tissues depends on β7 integrins. In this study, we studied disease severity and lymphocyte recruitment into the small intestine in SAMP1/YitFc mice, which develop chronic ileitis with similarity to human Crohn’s disease. To assess the role of β7 integrins in chronic ileitis, we generated SAMP1/YitFc lacking β7 integrins (SAMP1/YitFc Itgb7−/−) using a congenic strain developed via marker-assisted selection. We analyzed ileal inflammation in SAMP1/YitFc and SAMP1/YitFc Itgb7−/− mice by histopathology and the distribution of T and B lymphocytes in the mesenteric lymph nodes (MLNs) by flow cytometry. Short-term (18 h) adoptive transfer experiments were used to study the in vivo homing capacity of T and B lymphocytes. In both young (<20 wk) and old (20–50 wk) SAMP1/YitFc Itgb7−/− mice, ileitis was reduced by 30–50% compared with SAMP1/YitFc mice. SAMP1/YitFc Itgb7−/− mice showed a dramatic 67% reduction in the size of their MLNs, which was caused by a 85% reduction in lymphocyte numbers and reduced short-term B cell homing. Flow cytometric analysis revealed a highly significant decrease in the percentage of B cells in MLNs of SAMP1/YitFc Itgb7−/− mice. Cotransfer of SAMP1/YitFc MLN B cells but not SAMP1/YitFc Itgb7−/− MLN B cells along with CD4+ T cells resulted in exacerbated ileitis severity in SCID mice. Our findings suggest that β7 integrins play an essential role in spontaneous chronic ileitis in vivo by promoting homing of disease-exacerbating B cells to MLNs and other intestinal tissues.
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