Analgesic activity of the naturally occurring heptapeptide [Met]enkephalin-Arg6-Phe7.

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Analgesic activity of the naturally occurring heptapeptide [Met]enkephalin-Arg6-Phe7.

[Met]Enkephalin-Arg6-Phe7 is an opiate-like peptide normally found in the the adrenal gland and brain that has analgesic (antinociceptive) activity when administered directly into the cerebral ventricles of mice. On a molar basis, [Met]-enkephalin-Arg6-Phe7, with a median effective dose (ED50) of 38.5 nmol/mouse, is 8 times more potent than [Met]enkephalin. As with [Met]enkephalin, analgesic ac...

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Effect of endogenous opioid peptides on acetylcholine release from the cat superior cervical ganglion: selective effect of a heptapeptide.

The present experiments show the presence of both metenkephalin-like and met-enkephalin-Arg6-Phe7-like immunoreactivity in the superior cervical ganglion of the cat; this was determined by radioimmunoassay after high-pressure liquid chromatography separation of tissue extracts. There was measurable efflux of both peptides, as determined by radioimmunoassay of ganglionic perfusates; this measure...

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 1980

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.77.9.5512