Abstract
β-Endorphin and the synthetic β-endorphin-like decapeptide Ser-Leu-Thr-Cys-Leu-Val-Lys-Gly-Phe-Tyr (referred to as immunorphin), corresponding to the sequence 364-373 of the CH3 domain of human immunoglobulin G heavy chain, were shown to stimulate concanavalin A-induced proliferation of T lymphocytes from the blood of healthy donors. [Met5]Enkephalin and the antagonist of opioid receptors naloxone examined in parallel were inactive. The stimulating effect of β-endorphin and immunorphin on T lymphocyte proliferation is not inhibited by naloxone. Studies on receptor binding of 125I-labeled immunorphin to T lymphocytes revealed that it binds with high affinity to naloxone-insensitive receptors (K d = 7.0 ± 0.3 nM)). Unlabeled immunorphin completely inhibits 125I-labeled β-endorphin specific binding to naloxone insensitive receptors on T lymphocytes (K i = 0.6 ± 0.1 nM)). Thus, β-endorphin and immunorphin interact with common naloxone insensitive receptors on T lymphocytes.
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Navolotskaya, E.V., Malkova, N.V., Zargarova, T.A. et al. Effect of Synthetic β-Endorphin-Like Peptide Immunorphin on Human T Lymphocytes. Biochemistry (Moscow) 67, 357–363 (2002). https://doi.org/10.1023/A:1014844718799
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DOI: https://doi.org/10.1023/A:1014844718799