Isolation of an endogenous clonidine-displacing substance from rat brain |
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Authors: | D Atlas Y Burstein |
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Institution: | 1. Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, 91904 Jerusalem Israel;2. Department of Organic Chemistry, The Weizmann Institute of Science, 76100 Rehovot, Israel |
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Abstract: | An endogenous substance which specifically displaces clonidine, yohimbine and rauwolscine from rat brain alpha 2-adrenergic receptors, has been isolated. The new compound, designed clonidine-displacing-substance (CDS), has been partially purified by ion exchange chromatography, zone electrophoresis and high performance liquid chromatography (HPLC). CDS binds specifically to alpha 2-adrenergic receptors by competing with either alpha 2-adrenergic agonists or alpha 2-antagonists, but has no effect on the specific binding of 3H]prazosin to alpha 1-adrenergic receptors in rat brain membranes. In the course of isolation, CDS was shown to be neither the endogenous neurotransmitter (-)norepinephrine (NE) nor the guanyl nucleotide GTP which lowers the specific binding of alpha 2-agonists to the alpha 2-adrenergic receptors. |
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Keywords: | Yohimbine |
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