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Wong, P.C. et al.

Nonpeptide angiotensin II receptor antagonists: in vivo inhibition of [125I-Sar1,Ile8]angiotensin II binding by losartan, EXP597 and L-159,282 in rats.

Effects of losartan, L-159,282 and EXP597 on the in vivo binding of [125I-Sar1,Ile8]angiotensin II to kidney cortex and adrenal were examined in rats. Losartan, an AT1 receptor antagonist, completely blocked [125I-Sar1,Ile8]angiotensin II binding to the kidney cortex which contains only AT1 binding sites with an ID50 of 0.06 mg/kg. Losartan partially inhibited [125I-Sar1,Ile8]angiotensin II binding to the adrenal which contains equal amounts of AT1 and AT2 binding sites. Blockade by the AT1 receptor antagonist L-159,282 sufficiently increased the plasma levels of angiotensin II to block the AT2 receptor. EXP597 inhibited [125I-Sar1,Ile8]angiotensin II binding to the kidney cortex and adrenal almost totally with ID50s of 0.05 and 0.06 mg/kg, respectively. This result suggests that EXP597 exhibits almost equal binding affinity for AT1 and AT2 binding sites in vivo in rats.[1]

References

Nonpeptide angiotensin II receptor antagonists: in vivo inhibition of [125I-Sar1,Ile8]angiotensin II binding by losartan, EXP597 and L-159,282 in rats. Wong, P.C., Herblin, W.F., Barbera, F.A., Bernard, R., Bozarth, T.A., Watson, C.A., Gibson, R.E. Clin. Exp. Hypertens. (1996) [Pubmed]

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