Electrogenic ion transport across human endometrial epithelial cells grown as polarized monolayers on permeable supports was measured as an inward short-circuit current (Isc; 16.2 +/- 1.1 microA/cm2). Bombesin (10(-7) M) and human gastrin-releasing peptide (GRP; 10(-7) M) caused transient enhancement of this Isc. These effects were largely restricted to the basolateral surface of the cells; responses to apical peptide were modest in comparison with those to basolateral peptide. GRP and other bombesin-related peptides may have a role in regulation of endometrial epithelial ion transport in vivo and thereby influence the intra-uterine environment.

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