Surfactant protein D-mediated decrease of allergen-induced inflammation is dependent upon CTLA4.

Surfactant protein D-mediated decrease of allergen-induced inflammation is dependent upon CTLA4.
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DOI:
10.4049/jimmunol.0901947
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发表时间:
2010-06-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Finn PW
Finn PW
中科院分区:
其他
文献类型:
--
作者:
Lin KW;Jen KY;Suarez CJ;Crouch EC;Perkins DL;Finn PW

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肺表面活性物质蛋白D(SP-D)是胶原凝集素家族的成员,是一种对防御至关重要的先天性免疫分子,也可以调节适应性免疫应答。我们以前表明,SP-D缺陷小鼠表现出增强的过敏反应,SP-D诱导需要淋巴细胞。因此,我们推测SP-D可能通过与T细胞的相互作用降低适应性过敏反应。在这项研究中,我们使用了两种形式的SP-D,一个十二聚体(SP-D十二碳)和一个较短的片段含有三聚体的颈部和碳水化合物识别结构域(SP-D NCRD)。这两种形式都降低了体外和肺部炎症小鼠模型的免疫反应。SP-D NCRD增加了T细胞中细胞毒性T淋巴细胞抗原4(CTLA 4)的转录,CTLA 4是T细胞活化的负调节因子。当CTLA 4信号被消除时,SP-D NCRD不再降低淋巴细胞增殖和IL-2细胞因子的产生。当CTLA 4被抑制时,体内施用SP-D NCRD不再降低变应原诱导的应答。我们的研究结果表明,SP-D降低过敏原反应,这种作用可能是通过增加T细胞中的CTLA 4介导的。
Pulmonary surfactant protein D (SP-D), a member of the collectin family, is an innate immune molecule critical for defense that can also modulate adaptive immune responses. We previously showed that SP-D deficient mice exhibit enhanced allergic responses, and that SP-D induction requires lymphocytes. Thus, we postulated that SP-D may decrease adaptive allergic responses through interaction with T cells. In this study, we used two forms of SP-D, a dodecamer (SP-D dodec) and a shorter fragment containing the trimeric neck and carbohydrate recognition domains (SP-D NCRD). Both forms decreased immune responses in vitro and in a murine model of pulmonary inflammation. SP-D NCRD increased transcription of cytotoxic T lymphocyte antigen 4 (CTLA4), a negative regulator of T cell activation, in T cells. SP-D NCRD no longer decreased lymphoproliferation and IL-2 cytokine production when CTLA4 signals were abrogated. Administration of SP-D NCRD in vivo no longer decreased allergen induced responses when CTLA4 was inhibited. Our results indicate that SP-D decreases allergen responses, an effect that may be mediated by increase of CTLA4 in T cells.
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