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Microbial polysaccharide, HS-142-1, competitively and selectively inhibits ANP binding to its guanylyl cyclase-containing receptor.
Authors:Y Morishita  T Sano  K Ando  Y Saitoh  H Kase  K Yamada  Y Matsuda
Institution:Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd., Japan.
Abstract:During the search for ANP receptor ligands of microbial origin, we isolated a novel polysaccharide, HS-142-1, from culture broth of Aureobasidium sp. HS-142-1 inhibited 125I]-rANP binding to ANP receptor in rabbit kidney cortex membranes with an IC50 of 0.3 mu g/ml, but gave no effects on specific binding of 125I]-Endothelin nor 125I]-Angiotensin II to their respective receptors in bovine lung membranes. HS-142-1 competitively and selectively inhibited ANP binding to its guanylyl cyclase-containing receptor purified from solubilized bovine adrenocortical membranes and blocked cGMP production elicited by ANP. HS-142-1 is the first non-peptide antagonist selective for ANP functional receptor and will be a powerful tool to elucidate the physiological functions of ANP.
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