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Properties and mechanism of the action of the synthetic peptide octarphin

Abstract

The peptide TPLVTLFK, whose amino acid sequence corresponds to the 12–19 fragment of β-endorphin (the author’s name for the peptide octarphin), and its analogues (LPLVTLFK, TLLVTLFK, TPLVLLFK, TPLVTLLK, and TPLVTLFL) have been synthesized. Tritium-labeled octarphin (specific activity of 28 Ci/mol) has been obtained, and its binding to murine peritoneal macrophages has been studied. It was found that [3H]octarphin binds to macrophages with a high affinity (K d 2.3 ± 0.2 nM) and specificity. The specific binding of [3H]octarphin to macrophages was inhibited by the unlabeled β-endorphin and the selective agonist of the nonopioid β-endorphin receptor synthetic peptide immunorphin (SLTCLVKGFY) (K i 2.7 ± 0.2 and 2.4 ± 0.2 nM, respectively) and was not inhibited by unlabeled naloxone, α-endorphin, γ-endorphin, and [Met5]enkephalin (K i > 10 μM). The inhibitory activity of the octarphin analogues was more than 100 times lower than that of octarphin. It was shown that octarphin stimulates the activity of mouse immunocompetent cells in vitro and in vivo; at a concentration of 1–10 nM, it increased the adhesion and spreading of peritoneal macrophages and their ability to digest the bacteria of the Salmonella typhimurium virulent strain 415 in vitro. The intraperitoneal injection of the peptide at a dose of 20 μg/animal on day 7, 3, and 1 prior to the isolation of cells led to an increase in the activity of the peritoneal macrophages and the Tand B lymphocytes of the spleen.

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Abbreviations

ConA:

concanavalin A

LPS:

lipopolysaccharide

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Correspondence to E. V. Navolotskaya.

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Original Russian Text © Yu.N. Nekrasova, V.B. Sadovnikov, Yu.A. Zolotarev, E.V. Navolotskaya, 2010, published in Bioorganicheskaya Khimiya, 2010, Vol. 36, No. 5, pp. 638–645.

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Nekrasova, Y.N., Sadovnikov, V.B., Zolotarev, Y.A. et al. Properties and mechanism of the action of the synthetic peptide octarphin. Russ J Bioorg Chem 36, 589–595 (2010). https://doi.org/10.1134/S1068162010050067

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  • DOI: https://doi.org/10.1134/S1068162010050067

Key words

  • β-endorphin
  • peptides
  • naloxone
  • receptors
  • immune system