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  • Title: Regulation of electrolyte transport across cultured endometrial epithelial cells by prolactin.
    Author: Deachapunya C, Poonyachoti S, Krishnamra N.
    Journal: J Endocrinol; 2008 Jun; 197(3):575-82. PubMed ID: 18492821.
    Abstract:
    The effect of prolactin (PRL) on ion transport across the porcine glandular endometrial epithelial cells was studied in primary cell culture using the short-circuit current technique. Addition of 1 microg/ml PRL either to the apical solution or to the basolateral solution produced a peak followed by a sustained increase in Isc, but with a lesser response when PRL was added apically. Basolateral addition of PRL increased the Isc in a concentration-dependent manner with a maximum effect at 1 microg/ml and an effective concentration value of 120 ng/ml. The PRL-stimulated Isc was significantly reduced by pretreatment with an apical addition of 5-nitro-2-(3-phenylpropylamino) benzoic acid (200 microM), diphenylamine-2-carboxylic acid (1 mM) or 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (200 microM), Cl(-) channel blockers, but not by amiloride (10 microM), a Na(+) channel blocker. In addition, pretreatment with bumetanide (200 microM), a Na(+)-K(+)-2Cl(-) cotransporter inhibitor, in the basolateral solution significantly reduced the PRL-stimulated Isc. Replacement of Cl(-) or in the bathing solutions also decreased the Isc response to PRL. Pretreatment of the monolayer with AG490 (50 microM), an inhibitor of JAK2 activity significantly inhibited the PRL-induced increase in Isc. Western blot analysis of the porcine endometrial epithelial cells revealed the presence of short isoform of PRL receptor (PRLR-S) that could be regulated by 17beta-estradiol. The results of this investigation showed that PRL acutely stimulated anion secretion across the porcine endometrial epithelial cells possibly through PRLR-S present in both apical and basolateral membranes. The PRL response appeared to be mediated by the JAK2-dependent pathway.
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