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Aug 14, 2017 at 3:48 vote accept uhoh
Aug 11, 2017 at 18:31 comment added Alan Boyd The introduction to this paperInvolvement of Endogenous Enkephalins and β-Endorphin in Feeding and Diet-Induced Obesity – refers to opioid peptides as: endogenous opioids (twice); endogenous opioid peptides; endogenous ligands of opioid receptors; endogenous opioid activity; and finally states that 'This study aimed to distinguish the role of the two major classes of endogenous opioids acting at MORs and DORs, namely enkephalins and β-endorphin...'.
Aug 11, 2017 at 15:24 comment added anongoodnurse Perhaps, but a Google Scholar search of 2016-2017 Neuropharmacology papers on opioids fails to refer to any endogenous opioid peptides as "opioids".
Aug 11, 2017 at 15:05 comment added Alan Boyd ...I think the use of the term 'opioid peptide' is just a way of emphasising what is being discussed in a specific context.
Aug 11, 2017 at 15:05 comment added Alan Boyd @anongoodnurse Ref 2 of the WP page for opioids is as follows: Hemmings et al. (2013). Pharmacology and Physiology for Anesthesia: Foundations and Clinical Application: Expert Consult - Online and Print. Elsevier Health Sciences. p. 253. ISBN 1437716792. "Opiate is the older term classically used in pharmacology to mean a drug derived from opium. Opioid, a more modern term, is used to designate all substances, both natural and synthetic, that bind to opioid receptors (including antagonists)." [my emphasis] ...
Aug 11, 2017 at 14:16 comment added anongoodnurse The only issue I have with this answer is that endorphins, enkephalins, etc. are not listed as opioids but as "opioid peptides" (most commonly), "opioid neuropeptides", or opiate-like pentapeptides or some such, as far back as 1977. So far, I have not seen them referred to as opioids.
Aug 11, 2017 at 13:51 history answered Alan Boyd CC BY-SA 3.0