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  • Title: Comparison of K(+)-p-nitrophenyl phosphatase activity in the urinary bladder of the frog Rana esculenta during hibernation and active life.
    Author: De Piceis Polver P, Fenoglio C, Barni S, Gerzeli G.
    Journal: Eur J Histochem; 1999; 43(1):55-62. PubMed ID: 10340144.
    Abstract:
    We have studied effects of hibernation on the frog urinary bladder, an organ involved in water and ion transepithelial transport and taking part in osmoregulation. We have demonstrated K(+)-p-nitrophenyl phosphatase activity (an enzyme involved in ion and water transport) both in active and hibernating frogs. Most of the reaction product deposition was found on basolateral membranes of granular cells of the urinary bladder epithelium during all seasons. Therefore, it seems likely that this organ, unlike organs studied previously (skin, kidney and lung), maintains its function in the osmoregulatory process during hibernation.
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