Complement component 3 deficiency prolongs MHC-II disparate skin allograft survival by increasing the CD4+ CD25+ regulatory T cells population

Recent reports suggest that complement system contributes to allograft rejection. However, its underlying mechanism is poorly understood. Herein, we investigate the role of complement component 3 (C3) in a single MHC-II molecule mismatched murine model of allograft rejection using C3 deficient mice (C3−/−) as skin graft donors or recipients. Compared with C3+/+ B6 allografts, C3−/− B6 grafts dramatically prolonged survival in MHC-II molecule mismatched H-2bm12 B6 recipients, indicating that C3 plays a critical role in allograft rejection. Compared with C3+/+ allografts, both Th17 cell infiltration and Th1/Th17 associated cytokine mRNA levels were clearly reduced in C3−/− allografts. Moreover, C3−/− allografts caused attenuated Th1/Th17 responses, but increased CD4+CD25+Foxp3+ regulatory T (Treg) cell expression markedly in local intragraft and H-2bm12 recipients. Depletion of Treg cells by anti-CD25 monoclonal antibody (mAb) negated the survival advantages conferred by C3 deficiency. Our results indicate for the first time that C3 deficiency can prolong MHC-II molecule mismatched skin allograft survival, which is further confirmed to be associated with increased CD4+ CD25+ Treg cell population expansion and attenuated Th1/Th17 response.

• Publication year

  2016

• Venue

  Scientific Reports

• Publication date

  2016-09-19

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1038/srep33489PMID 27641978PMCID 5027598
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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