Journal
JOURNAL OF CLINICAL GASTROENTEROLOGY
Volume 39, Issue 4, Pages S53-S58Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.mcg.0000155521.81382.3a
Keywords
HCO3 secretion; diarrhea; short-chain fatty acids
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Funding
- NIDDK NIH HHS [R01 DK 60069] Funding Source: Medline
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Understanding of the mechanism of colonic electrolyte transport has markedly increased over the past three decades. This article provides a brief summary of the critical features of Na, Cl, and K transport in the large intestine and how these processes may be altered in diarrhea. Less understood is the mechanism of colonic HCO3 secretion. Recent progress in the regulation of HCO3 secretion in the distal colon is summarized with emphasis on the interrelationship between Cl-dependent, short-chain fatty acid (SCFA)-dependent, and cAMP-induced HCO3 secretion. cAMP down-regulates Cl-dependent HCO3 secretion, while SCFA stimulates HCO3 secretion but also inhibits both Cl-dependent and cAMP-induced HCO3 secretion. As SCFAs are the primary anions in stool, it is likely that SCFA-dependent HCO3 secretion is the primary mechanism of HCO3 secretion in the mammalian colon. Future studies will undoubtedly provide increased understanding of the mechanism of HCO3 secretion in health and disease.
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