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[Reactive changes in the smooth muscle tissue of the rat small intestine during experimental intestinal obstruction].

Using light, electron microscopy and immunohistochemical methods, the reactive transformation of smooth muscle tissue (SMT) was studied in the intestinal wall during the development of acute partial high intestinal obstruction. The material of small intestine was taken from 10 male rats in both the zone of ligature application, and proximal and distal zones, 3 cm distant from the ligation zone. The results of the study demonstrate that in partial intestinal obstruction, the nature of structural and functional SMT transformation was variable depending upon differences in functional and destructive loads. During these changes, the remodeling of smooth myocyte population was shown to be one of the mechanisms of SMT adaptation to the changing conditions of functioning. Immunohistochemical analysis found no changes in the pattern of expression of marker and phenotypic proteins in the intestinal zones studied during the dynamics of an experiment.