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Receptor selectivity of Met-enkephalin-Arg6-Phe7, an endogenous opioid peptide, in cerebral cortex of human and rat.

Abstract：

:This study was undertaken to examine the receptor selectivity of Met-enkephalin-Arg6-Phe7 (MERF) employing radioreceptor binding assays in human cerebral cortex membranes, and to elucidate the responsible receptors that mediate the regulatory action of MERF on high (20 mM) K+-stimulated release of [3H]norepinephrine ([3H]-NE) in rat cortex slices. Specific binding of [3H]MERF was inhibited by DAMGO, Tyr-D-Arg-Phe-Sar(TAPS), bremazocine and ethylketocyclazocine (EKC), but not by U69,593 (U69) and DPDPE. MERF showed high affinity for specific binding sites of [3H]DAMGO. However, MERF had little influence on the specific binding of [3H]DPDPE, [3H]U69 and [3H]diprenorphine ([3H]DIP) in the presence of 1 microM each of DAMGO, DPDPE and U69. In [3H]NE release experiments using rat cortex slices, DAMGO, MERF and EKC, in order of their potency, inhibited K+-stimulated release of [3H]NE. The inhibitory effects of MERF and DAMGO were more sensitive than that of EKC to antagonism by CTAP, nor-binaltorphimine (nor-BNI) and naloxone. These results suggested that MERF possesses high affinity for mu-receptors, but not for delta-, kappa1-, and very low affinity for kappa2-receptors in human cerebral cortex membranes. Also, the inhibitory effect of MERF on the K+-stimulated release of [3H]NE appears to be mediated by mu-receptors in rat cerebral cortex slices.

journal_name

Life Sci

journal_title

Life sciences

authors

Kim KW,Woo RS,Kim CJ,Cheong YP,Kim JK,Kwun J,Cho KP

doi

10.1016/s0024-3205(00)00606-8

subject

Has Abstract

pub_date

2000-05-26 00:00:00

pages

61-71

issue

1

eissn

0024-3205

issn

1879-0631

pii

S0024320500006068

journal_volume

67

pub_type

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