Abstract
Background
While enterocyte secretion is the predominant mechanism considered responsible for secretory diarrhea in response to acute enteric infections, there are several lines of evidence that support alternative mechanisms controlling fluid and electrolyte secretion in diarrhea.
Aim
To review enteroendocrine and neuronal mechanisms that participate in the development of acute infectious diarrhea.
Recent Advances
Acute infectious diarrheas due to bacterial toxins (e.g., cholera, E. coli heat-stable enterotoxin, C. difficile) and rotavirus are all associated with secretion of transmitters from enteroendocrine cells (e.g., 5-HT) and activation of afferent neurons that stimulate submucosal secretomotor neurons. The latter secrete acetylcholine (which binds to muscarinic receptors on epithelial cells) and VIP. Involvement of nerves was demonstrated by inhibition of bacterial toxin-induced secretion by hexamethonium (nicotinic), tetrodotoxin (Na+ channel blocker), and lidocaine (visceral/mucosal afferents). Nicotinic receptors are present on secretomotoneurons and these are activated by release of acetylcholine from enteric interneurons or extrinsic efferent fibers. Specific organisms also modify other mechanisms that may contribute to development of acute diarrhea. Thus, mucin secretion, activation of motor mechanisms, increased mucosal permeability and inhibition of bile acid absorption have been reported in specific types of acute infectious diarrhea.
Conclusion
New therapies targeting neural and transmitter mediation including 5-HT, VIP, NPY, as well as toxin receptors and channels activated during acute infectious diarrhea could usher in a novel approach to enhancing glucose–electrolyte solutions used in the treatment of acute diarrhea.
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Abbreviations
- 5-HT:
-
Serotonin
- ACh:
-
Acetyl choline
- BAC:
-
Benzalkonium chloride
- cAMP:
-
Cyclic adenosine monophosphate
- CFTR:
-
Cystic fibrosis transmembrane conductance regulator
- cGMP:
-
Cyclic guanosine monophosphate
- CGRP:
-
Calcitonin gene-related peptide
- CT:
-
Cholera toxin
- GCC:
-
Guanylate cyclase C
- GM1 :
-
Ganglioside membrane receptor
- IFN:
-
Interferon
- Isc:
-
Short-circuit current
- MAPC:
-
Migrating action potential complex
- NK1 :
-
Neurokinin 1
- NPY:
-
Neuropeptide Y
- STa:
-
E. coli heat-stable enterotoxin
- TTX:
-
Tetrodotoxin
- VIP:
-
Vasoactive intestinal peptide
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Acknowledgments
Dr. M. Camilleri is funded by grant RO1-DK079866 from National Institutes of Health. The excellent secretarial support of Mrs. Cindy Stanislav is gratefully acknowledged.
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Camilleri, M., Nullens, S. & Nelsen, T. Enteroendocrine and Neuronal Mechanisms in Pathophysiology of Acute Infectious Diarrhea. Dig Dis Sci 57, 19–27 (2012). https://doi.org/10.1007/s10620-011-1939-9
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DOI: https://doi.org/10.1007/s10620-011-1939-9