Dexamethasone promotes tolerance in vivo by enriching CD11clo CD40lo tolerogenic macrophages.

Dexamethasone promotes tolerance in vivo by enriching CD11clo CD40lo tolerogenic macrophages.
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DOI:
10.1002/eji.201242468
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发表时间:
2013-01
影响因子:
5.4
通讯作者:
Chen A
Chen A
中科院分区:
医学3区
文献类型:
--
作者:
Zheng G;Zhong S;Geng Y;Munirathinam G;Cha I;Reardon C;Getz GS;van Rooijen N;Kang Y;Wang B;Chen A

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我们先前表明,在免疫抑制剂地塞米松(我们称之为“抑制免疫”的策略)的存在下,抗原免疫可以耐受建立的T细胞的回忆反应。然而,地塞米松作为致耐受性佐剂的机制仍不清楚。在本研究中,我们发现,在脾脏和外周淋巴结,地塞米松剂量依赖性地丰富CD 11 cloCD 40 lo巨噬细胞耗尽所有其他CD 11 c + CD 40+细胞,包括树突状细胞。富集的巨噬细胞显示出不同的MHC IIloCD 86 hi表型。在体内被回忆抗原激活后,它们上调IL-10(致耐受性抗原呈递细胞的经典标志物)并引发血清IL-10应答。当在体内呈递回忆抗原时,它们不会引起记忆T细胞的回忆应答,而是刺激抗原特异性调节性T细胞的扩增。此外,在抑制的免疫期间CD 11 cloCD 40 lo巨噬细胞的消耗降低了后者的致耐受性功效。这些结果表明地塞米松部分通过富集CD 11 cloCD 40 lo致耐受性巨噬细胞而充当致耐受性佐剂。
We previously showed that antigen immunization in the presence of the immunosuppressant dexamethasone (a strategy we termed “suppressed immunization”) could tolerize established recall responses of T cells. However, the mechanism by which dexamethasone acts as a tolerogenic adjuvant has remained unclear. In the present study, we show that in the spleen and peripheral lymph nodes, dexamethasone dose-dependently enriches CD11cloCD40lo macrophages by depleting all other CD11c+CD40+ cells including dendritic cells. The enriched macrophages display a distinct MHC IIloCD86hi phenotype. Upon activation by a recall antigen in vivo, they upregulate IL-10, a classic marker for tolerogenic antigen-presenting cells, and elicit a serum IL-10 response. When presenting a recall antigen in vivo, they do not elicit recall responses of memory T cells, but rather stimulate the expansion of antigen-specific regulatory T cells. Moreover, depletion of CD11cloCD40lo macrophages during suppressed immunization diminishes the latter’s tolerogenic efficacy. These results indicate that dexamethasone acts as a tolerogenic adjuvant partly by enriching the CD11cloCD40lo tolerogenic macrophages.
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