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Tarnawski, A.S. et al.

Tarnawski, Pai, Wang, Tomikawa,

Translocation of MAP (Erk-1 and -2) kinases to cell nuclei and activation of c-fos gene during healing of experimental gastric ulcers.

We examined localization of extracellular signal regulated kinases ( Erk) 1 and 2, and c-fos mRNA expression in normal and ulcerated gastric mucosa in rats at 1, 3 and 7 days after gastric ulcer induction. In normal gastric mucosa immunofluorescence signal for Erk-1 and Erk-2 was detectable in surface epithelial, neck and some glandular cells. In gastric mucosa of the ulcer margin, almost all epithelial cells displayed strong Erk-1 and Erk-2 immunoreactivity in the basolateral membranes and the cytoplasm. In addition 19+/-3% of cells showed nuclear localization of the Erk-1 and -2 signal. The c-fos mRNA expression was increased by 790+/-14% and 220+/-10%, respectively in gastric ulcer at 3 and 7 days after ulcer induction. Since in in vitro models nuclear translocation of Erk-1 and -2 triggers cell proliferation, our finding indicates relevance of this mechanism to gastric ulcer healing.[1]

References

Translocation of MAP (Erk-1 and -2) kinases to cell nuclei and activation of c-fos gene during healing of experimental gastric ulcers. Tarnawski, A.S., Pai, R., Wang, H., Tomikawa, M. J. Physiol. Pharmacol. (1998) [Pubmed]

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