RRC ID 61624
Author Iino S, Horiguchi S, Horiguchi K, Hashimoto T.
Title Interstitial cells of Cajal in Wsh/Wsh c-kit mutant mice.
Journal J Smooth Muscle Res
Abstract The c-Kit receptor tyrosine kinase regulates the development and differentiation of several progenitor cells. In the gastrointestinal (GI) tract, the c-Kit regulates the development of the interstitial cells of Cajal (ICC) that are responsible for motility regulation of the GI musculature. W-sash (Wsh) is an inversion mutation upstream of the c-kit promoter region that affects a key regulatory element, resulting in cell-type-specific altered gene expression, leading to a decrease in the number of mast cells, melanocytes, and ICC. We extensively examined the GI tract of Wsh/Wsh mice using immunohistochemistry and electron microscopy. Although the musculature of the Wsh/Wsh mice did not show any c-Kit immunoreactivity, we detected intensive immunoreactivity for transmembrane member 16A (TMEM16A, anoctamin-1), another ICC marker. TMEM16A immunopositive cells were observed as ICC-MY in the gastric corpus-antrum and the large intestine, ICC-DMP in the small intestine, and ICC-SM in the colon. Electron microscopic analysis revealed these cells as ICC from their ultrastructural features, such as numerous mitochondria and caveolae, and their close contact with nerve terminals. In the developmental period, we examined 14.5 and 18.5 day embryos but did not observe c-Kit immunoreactivity in the Wsh/Wsh small intestine. From this study, ICC subtypes developed and maturated structurally without c-Kit expression. Wsh/Wsh mice are a new model to investigate the effects of c-Kit and unknown signaling on ICC development and function.
Volume 56(0)
Pages 58-68
Published 2020-1-1
DOI 10.1540/jsmr.56.58
PMID 33132281
PMC PMC7596356
MeSH Animals Cell Differentiation / genetics* Gastrointestinal Tract / cytology Gene Expression Gene Expression Regulation, Developmental Interstitial Cells of Cajal / physiology* Mice, Mutant Strains / genetics* Mutation / genetics* Proto-Oncogene Proteins c-kit / genetics* Proto-Oncogene Proteins c-kit / physiology
Mice RBRC00762