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2014 ; 5
(5
): 652-62
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Re-thinking the functions of IgA(+) plasma cells
#MMPMID25483334
Gommerman JL
; Rojas OL
; Fritz JH
Gut Microbes
2014[]; 5
(5
): 652-62
PMID25483334
show ga
The intestinal mucosa harbors the largest population of antibody (Ab)-secreting
plasma cells (PC) in the human body, producing daily several grams of
immunoglobulin A (IgA). IgA has many functions, serving as a first-line barrier
that protects the mucosal epithelium from pathogens, toxins and food antigens
(Ag), shaping the intestinal microbiota, and regulating host-commensal
homeostasis. Signals induced by commensal colonization are central for regulating
IgA induction, maintenance, positioning and function and the number of IgA(+) PC
is dramatically reduced in neonates and germ-free (GF) animals. Recent evidence
demonstrates that the innate immune effector molecules tumor necrosis factor ?
(TNF?) and inducible nitric oxide synthase (iNOS) are required for IgA(+) PC
homeostasis during the steady state and infection. Moreover, new functions
ascribed to PC independent of Ab secretion continue to emerge, suggesting that
PC, including IgA(+) PC, should be re-examined in the context of inflammation and
infection. Here, we outline mechanisms of IgA(+) PC generation and survival,
reviewing their functions in health and disease.