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Upregulation of CD72 expression on CD19+CD27+ memory B cells by CD40L in primary immune thrombocytopenia.
- Source :
- British Journal of Haematology; Jul2017, Vol. 178 Issue 2, p308-318, 11p
- Publication Year :
- 2017
-
Abstract
- CD72 is a co-receptor of B cells and regulates B cell activation. Although aberrant expression of CD72 has been reported in primary immune thrombocytopenia ( ITP), it is uncertain whether this aberrant expression is restricted to specific B cell subsets. Furthermore, the mechanisms that regulate CD72 expression are unknown. In this study, we found higher frequency of CD19<superscript>+</superscript> B cells, CD19<superscript>+</superscript>CD27<superscript>+</superscript> memory B cells and lower frequency of CD19<superscript>+</superscript>CD27<superscript>−</superscript> naive B cells in active ITP patients compared with controls and patients in remission. CD72 expression on CD19<superscript>+</superscript>CD27<superscript>+</superscript> cells was upregulated in active ITP patients and correlated with platelet count and anti-platelet autoantibodies. In vitro, CD40L could specifically induce CD72 upregulation on CD19<superscript>+</superscript>CD27<superscript>+</superscript> B cells. In combination with CD40L, interleukin ( IL) 10 and BAFF (also termed TNFSF13B) further enhanced CD72 expression on CD19<superscript>+</superscript>CD27<superscript>+</superscript> B cells, whereas IL21 reduced CD72 upregulation. CD72 mRNA expression after CD40L stimulation was increased in ITP patients and controls. Significant increase of CD40L on CD4<superscript>+</superscript> T cells was correlated with CD72 expression on CD19<superscript>+</superscript>CD27<superscript>+</superscript> B cells in ITP patients. In conclusion, upregulation of CD72 expression on CD27<superscript>+</superscript>memory B cells might take part in the pathogenesis of ITP. Elevated CD40L on CD4<superscript>+</superscript> cells combined with cytokines might contribute to the upregulation of CD72 expression on CD27<superscript>+</superscript>memory B cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00071048
- Volume :
- 178
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- British Journal of Haematology
- Publication Type :
- Academic Journal
- Accession number :
- 124060634
- Full Text :
- https://doi.org/10.1111/bjh.14671