AC-DELTA-ENDORPHIN (HUMAN)

β-Endorphin (1-27) (human) is an opioid antagonist that binds μ-, δ-, and κ-opioid receptors with Kis of 5.31, 6.17, and 39.82 nM, respectively. β-Endorphin (1-27) (human) inhibits β-Endorphin (HY-P1502)-induced and etorphine-induced analgesia[1][2].

[1] Mansour A, et al. The cloned mu, delta and kappa receptors and their endogenous ligands: evidence for two opioid peptide recognition cores. Brain Res. 1995 Nov 27;700(1-2):89-98. DOI:10.1016/0006-8993(95)00928-j
[2] Nicolas P, et al. Beta-endorphin-(1-27) is a naturally occurring antagonist to etorphine-induced analgesia. Proc Natl Acad Sci U S A. 1985 May;82(10):3178-81. DOI:10.1073/pnas.82.10.3178