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Zoolog Sci. 2005 Jan;22(1):95-100.

Prolactin, an activator of epithelial Na+ channel, inhibits basolateral K+ channels in adult tree frog skin.

Author information

  • Department of Physiology, Saitama Medical School, Moroyama, Iruma-gun, Saitama 650-0495, Japan. makokam@saitama-med.ac.jp

Abstract

Adult amphibian skin actively transports Na+ from its apical to basolateral side while in turn, K+ is recycled through Na+, K+-ATPase and K+ channels located in the basolateral membrane. We previously found that PRL stimulates Na+ transport in the skin of the adult tree frog (Hyla arborea japonica) via an increase in the open-channel density of the epithelial Na+ channel (ENaC). If PRL also activates basolateral K+ channels, this activation would help to stimulate Na+ transport, too. Whether PRL does indeed stimulate basolateral K+ channels in the adult tree frog was examined by measuring the short-circuit current across nystatin-treated skin. Both tolbutamide, a K(ATP) channel blocker, and tetrapentylammonium (TPA), a KCa channel blocker, blocked the current, the effect of TPA being more powerful than that of tolbutamide. Contrary to expectation, PRL inhibited the basolateral K+ channels in this skin. In the presence of basolateral amiloride, PRL still inhibited the basolateral K+ current, suggesting that the (Na+)-H+ exchanger located in the basolateral membrane does not mediate the inhibitory effect of PRL on the basolateral K+ channels in Hyla.

PMID:
15684589
[PubMed - indexed for MEDLINE]
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