New insights into heterogeneity of peritoneal B‐1a cells. Issue 1 (18th May 2015)

• Record Type: Journal Article
• Authors: Wang, Hongsheng; Lin, Jian‐xin; Li, Peng; Skinner, Jeff; Leonard, Warren J.; Morse, Herbert C.
• Is Part Of: Annals of the New York Academy of Sciences. Volume 1362:Issue 1(2015)
• Page Start: 68
• Page End: 76
• Publication Date: 2015-05-18
• Subjects: B‐1a -- PC1 -- IL‐10 -- lymphocyte trafficking; Medical sciences -- Periodicals; Medicine -- Periodicals; Science -- Periodicals; 610
• DOI: 10.1111/nyas.12791
• Languages: English
• ISSNs: 0077-8923

Abstract

Abstract : Peritoneal B‐1a cells are characterized by their expression of CD5 and enrichment for germline‐encoded IgM B cell receptors. Early studies showing expression of a diverse array of VDJ sequences among purified B‐1a cells provided a molecular basis for understanding the heterogeneity of the B‐1a cell repertoire. Antigen‐driven positive selection and the identification of B‐1a specific progenitors suggest multiple origins of B‐1a cells. The introduction of new markers such as PD‐L2, CD25, CD73, and PC1 (plasma cell alloantigen 1, also known as ectonucleotide phosphodiesterase/pyrophosphatase 1) further helped to identify phenotypically and functionally distinct B‐1a subsets. Among many B‐1a subsets defined by these new markers, PC1 is unique in that it subdivides B‐1a cells into PC1 hi and PC1 lo subpopulations with distinct functions, such as production of natural IgM and gut IgA, response to the pneumococcal antigen PPS‐3, secretion of interleukin‐10, and support for T helper 1 (TH 1) cell differentiation. RNA sequencing of these subsets revealed differential expression of genes involved in cellular movement and immune cell trafficking. We will discuss these new insights underlying the heterogeneous nature of the B‐1a cell repertoire.