Segmented Filamentous Bacterium Uses Secondary and Tertiary Lymphoid Tissues to Induce Gut IgA and Specific T Helper 17 Cell Responses

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• 作者：Emelyne Lé ; cuyer¹ ; ² ; Sabine Rakotobe¹ ; ² ; ³ ; Hé ; lè ; ne Lengliné ; -Garnier¹ ; ² ; ⁴ ; Corinne Lebreton¹ ; ² ; Marion Picard¹ ; ² ; Catherine Juste³ ; Ré ; mi Fritzen² ; ⁵ ; Gé ; rard Eberl⁶ ; Kathy D. McCoy⁷ ; Andrew J. Macpherson⁷ ; Claude-Agnè ; s Reynaud² ; ⁵ ; Nadine Cerf-Bensussan¹ ; ² ; ⁸ ; ^{nadine.cerf-bensussan@inserm.fr" class="auth_mail} ; Valé ; rie Gaboriau-Routhiau¹ ; ² ; ³ ; ⁸ ; ^{valerie.gaboriau-routhiau@inserm.fr" class="auth_mail}
• 刊名：Immunity
• 出版年：17 April, 2014
• 年：2014
• 卷：40
• 期：4
• 页码：608-620
• 全文大小：3808 K

文摘

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Summary

Segmented filamentous bacterium (SFB) is a symbiont that drives postnatal maturation of gut adaptive immune responses. In contrast to nonpathogenic E.聽coli, SFB stimulated vigorous development of Peyer鈥檚 patches germinal centers but paradoxically induced only a low frequency of specific immunoglobulin A (IgA)-secreting cells with delayed accumulation of somatic mutations. Moreover, blocking Peyer鈥檚 patch development abolished IgA responses to E.聽coli, but not to SFB. Indeed, SFB stimulated the postnatal development of isolated lymphoid follicles and tertiary lymphoid tissue, which substituted for Peyer鈥檚 patches as inductive sites for intestinal IgA and SFB-specific T helper 17 (Th17) cell responses. Strikingly, in mice depleted of gut organized lymphoid tissue, SFB still induced a substantial but nonspecific intestinal Th17 cell response. These results demonstrate that SFB has the remarkable capacity to induce and stimulate multiple types of聽intestinal lymphoid tissues that cooperate to generate potent IgA and Th17 cell responses displaying only limited target specificity.