The effects of hydrogen sulfide baths and sulfide-silt mud applications on the abdominal wall were studied in outbred white rats. Heart preparations stained with hematoxylin and eosin were analyzed and the mean numbers of cells expressing Ki-67, Nkx-2.5, and mesenchymal stem cell markers were determined. Hydrogen sulfide balneotherapy promoted the development of blood capillaries in rat hearts and an increased the expression of CD34. A decrease in the regenerative potential of the myocardium was found due to a decrease in the content of proliferating cells and cells expressing CD73, CD90, and CD105, and also due to the absence of cells stained for cardiomyogenic differentiation marker Nkx-2.5.
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