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:
影响因子:
--
通讯作者:
Finn PW
中科院分区:
文献类型:
--
作者:
Lin KW;Jen KY;Suarez CJ;Crouch EC;Perkins DL;Finn PW
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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