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Angiotensin II type 1 receptors have been identified in Fallopian tube epithelia. Polarized confluent human Fallopian tube epithelial cell cultures were used under short-circuit conditions to study the actions of angiotensin II on electrogenic ion transport. The results demonstrate that angiotensin II increases baseline short-circuit current, implying a net transport of negatively charged ions from a basal to apical direction. This effect was inhibited by the selective angiotensin II type 1 receptor antagonist losartan. The effects of angiotensin II on short-circuit current were rapid in onset, brief in duration, and although less than those achieved with ATP, similar in amplitude to those described for other epithelia with angiotensin II. These findings reflect a significant retention of function for these cells in monolayer culture. Immunohistochemistry using the antibody 6313/G2, which is directed against a specific sequence in the extracellular domain of the angiotensin II type 1 receptor, confirmed that the receptor was retained in cultured cells. The results indicate that angiotensin II plays a role in regulating the composition of Fallopian tube secretions.

Effect of angiotensin II on ion transport across human Fallopian tube epithelial cells in vitro