Calcium Signaling: From Normal B Cell Development to Tolerance Breakdown and Autoimmunity

Clinical Reviews in Allergy & Immunology
Patrice HemonOlivier Mignen

Abstract

Maintenance of self-tolerance of auto-reactive lymphocytes is a fundamental mechanism to prevent the onset of autoimmune diseases. Deciphering the mechanisms involved in the deregulations leading to tolerance disruption and autoimmunity is still a major area of interest to identify new therapeutic targets and options. Ca2+ signaling plays a major role in B cell normal development and is therefore finely tuned by B cell receptor (BCR)-dependent and independent pathways. Developmental changes in the characteristics of BCR-dependent Ca2+ signals as well as the modulation of basal intracellular concentration ([Ca2+]i) contribute strongly to self-tolerance maintaining mechanisms responsible for the physical or functional elimination of autoreactive B cells such as clonal deletion, receptor editing, and anergy. Implication of Ca2+ signals in B tolerance mechanisms mainly occurs through the specific activation of transcriptional programs depending on the amplitude, shape, and duration of Ca2+ signals. A large number of studies reported Ca2+ signaling defects in autoimmune pathology such as systemic lupus erythematosus (SLE), rheumatoid arthritis (RA) and primary Sjӧgren's syndrome (pSS). However, the precise nature of the molecular ev...Continue Reading

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