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

Ko Wei Lin, Kai Yu Jen, Carlos Jose Suarez, Erika C. Crouch, David L. Perkins, Patricia W. Finn

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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 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 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.

Original languageEnglish
Pages (from-to)6343-6349
Number of pages7
JournalJournal of Immunology
Issue number11
StatePublished - Jun 1 2010


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