Abstract:
:B lymphocytes contribute to the pathogenesis of autoimmune disorders since B-cell depletion treatment improves such diseases. However, B cells seem ambivalent. Murine strains of nonorgan-specific as well as organ-specific autoimmune conditions present with aggravated symptoms when B cells are depleted. It is thus likely that some B cells are pathogenic while other have regulatory function. There is not only one regulatory B cell (Breg) subset, but different types of Breg cells. Regulatory function can thus be ascribed to autoreactive B cells, marginal zone B cells, transitional type 2-like B cells, or CD5(+) B cells. Regulatory activity is induced only following cell activation through a B-cell receptor, CD40, and/or TLR9. Regulatory effects are then mediated by a soluble agent, such as IL-10, and/or direct cell-to-cell contacts that involve CD40 or B7 co-stimulatory molecules. Targeted cells also vary from one disease to another. Antigen-specific autoreactive T cells, dendritic cells, macrophages, and regulatory T lymphocytes can thus be either inhibited or activated to finally modulate the autoimmune response. Taken as a whole, it appears that Breg cells participate in the control of autoimmunity within a complex cellular network that may differ for each pathology. Adapted stimulation and control of regulatory activity would thus be a prerequisite to an efficient usage of these B cells as an alternative therapy for autoimmune diseases.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Lemoine S,Morva A,Youinou P,Jamin Cdoi
10.1111/j.1749-6632.2009.04651.xsubject
Has Abstractpub_date
2009-09-01 00:00:00pages
260-7eissn
0077-8923issn
1749-6632pii
NYAS4651journal_volume
1173pub_type
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