Impairment of Kit-dependent development of interstitial cells alters contractile responses of murine intestinal tract

The American Journal of Physiology
D SatoK Nishi

Abstract

We examined developmental changes in responses of the isolated segment of the ileum of BALB/c mice treated with a monoclonal antibody (ACK2) to the receptor tyrosine kinase (Kit) for 4 days postnatally to pharmacological agents in vitro. Rhythmic contraction and relaxation of the isolated ileum started to appear on day 4 postpartum, and the sensitivity to acetylcholine (ACh) decreased gradually after birth. Treatment with ACK2 induced augmentation of contractile responses and receptor sensitivity of the longitudinal muscle of the ileum to ACh, bradykinin, and prostaglandin F2 alpha. ACh induced larger depolarization in smooth muscle cells of the ileum in the ACK2-treated mice than in the control. Circular muscle responses to these substances, as measured by changes in intraluminal pressure, were not altered by ACK2 treatment. Results suggest that interstitial cells play an important role not only in the development of the pacemaking system of the small intestine but also in the functional development of the contractile properties of the intestinal smooth muscle.

Citations

Oct 13, 2007·American Journal of Physiology. Gastrointestinal and Liver Physiology·Sushil K Sarna
Feb 15, 2001·American Journal of Physiology. Gastrointestinal and Liver Physiology·G DonnellyJ D Huizinga
Oct 29, 2020·American Journal of Physiology. Gastrointestinal and Liver Physiology·Maria-Gabriela Colmenares AguilarSimon J Gibbons

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