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2017 ; 25
(3
): 635-646
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gab.com Text
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Orai1-Mediated Antimicrobial Secretion from Pancreatic Acini Shapes the Gut
Microbiome and Regulates Gut Innate Immunity
#MMPMID28273482
Ahuja M
; Schwartz DM
; Tandon M
; Son A
; Zeng M
; Swaim W
; Eckhaus M
; Hoffman V
; Cui Y
; Xiao B
; Worley PF
; Muallem S
Cell Metab
2017[Mar]; 25
(3
): 635-646
PMID28273482
show ga
The gut microbiome participates in numerous physiologic functions and
communicates intimately with the host immune system. Antimicrobial peptides are
critical components of intestinal innate immunity. We report a prominent role for
antimicrobials secreted by pancreatic acini in shaping the gut microbiome that is
essential for intestinal innate immunity, barrier function, and survival.
Deletion of the Ca(2+) channel Orai1 in pancreatic acini of adult mice resulted
in 60%-70% mortality within 3 weeks. Despite robust activation of the intestinal
innate immune response, mice lacking acinar Orai1 exhibited intestinal bacterial
outgrowth and dysbiosis, ultimately causing systemic translocation, inflammation,
and death. While digestive enzyme supplementation was ineffective, treatments
constraining bacterial outgrowth (purified liquid diet, broad-spectrum
antibiotics) rescued survival, feeding, and weight gain. Pancreatic levels of
cathelicidin-related antimicrobial peptide (CRAMP) were reduced, and supplement
of synthetic CRAMP prevented intestinal disease. These findings reveal a critical
role for antimicrobial pancreatic secretion in gut innate immunity.