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Endogenously occurring opioid peptides are rapidly metabolized by different ectopeptidases. Human opiorphin is a recently discovered natural inhibitor of the enkephalin-inactivating neutral endopeptidase (NEP) and aminopeptidase-N (AP-N) (Wisner et al., 2006). To date, in vitro receptor binding experiments must be performed either in the presence of a mixture of peptidase inhibitors and/or at low...
The neuroendocrine and behavioral effects of Tyr-d-Ala-Gly-Phe-d-Nle-Arg-Phe (DADN), a more stable derivative of the endogenous opiate Met-enkephalin related peptide Met 5 -enkephalin-Arg 6 -Phe 7 were investigated in mice. The behavioral experiments consisted of monitoring the horizontal (square crossing) and vertical (rearing) locomotion in the open field system. To evaluate...
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