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Angiotensin II stimulation of the basolateral located Na+/H+ antiporter in eel (Anguilla anguilla) enterocytes
in Journal of Molecular EndocrinologyABSTRACT
The pH-sensitive fluorescent dye, 2′,7′-bis-carboxy-ethyl-5,6-carboxyfluorescein acetoxymethyl ester, was used to examine the effects of fish or human angiotensin II (Ang II) on the activity of the basolateral located Na+/H+ antiporter in eel intestinal cell suspensions. Exposure of eel enterocytes to either hormone led to an increased activity of the antiporter. This time- and dose-dependent stimulatory effect was inhibited by the specific antiporter inhibitor dimethylamiloride (DMA).
Preincubation with a monoclonal antibody (6313/G2), directed against the N-terminal extracellular domain of the mammalian AT1 Ang II receptor, prevented the stimulatory effect of the hormone and inhibited the binding of [3,5-3H]Tyr4-Ile5-Ang II to intestinal cell suspensions, suggesting specific binding of the antibody to the eel Ang II receptor. The results indicate that both fish and human Ang II stimulate the DMA-sensitive Na+/H+ antiporter present in eel intestinal cells by means of a mammalian AT1-like receptor.
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Online ISSN: 1479-6813
Print ISSN: 0952-5041
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