Abstract
Following reports of the presence of endogenous opiate activity in the brain (Pasternak et al., 1975; Terenius and Wahlström, 1975), two pentapeptides (Met-enkephalin: H-Tyr-Gly-Gly-Phe-Met-OH; Leu-enkephalin: H-Tyr-Gly-Gly-Phe-Leu-OH) were isolated from porcine (Bradbury et al., 1976) and calf (Simantov and Snyder, 1976) brain and shown to possess high opiate agonist activity. The sequence of Met-enkephalin is the same as the N-terminus of β-endorphin, the C-fragment of β-lipotropin (β-LPH61n91) first isolated from sheep pituitary gland (Li et al., 1965). β-Endorphin has been isolated and characterized from camel pituitary glands (Li and Chung, 1976) as well as from many other species including the human, and shown to be an analgesic agent as measured by both in vitro (Bradbury et al., 1976; Cox et al., 1976; Li and Chung, 1976) and in vivo (Loh et al., 1976) methods.
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Dupont, A. et al. (1982). Relationship of Opiate Peptides to Neuroendocrine Functions. In: Shah, N.S., Donald, A.G. (eds) Endorphins and Opiate Antagonists in Psychiatric Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1119-5_7
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DOI: https://doi.org/10.1007/978-1-4684-1119-5_7
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