Abstract
A selective agonist of non-opioid β-endorphin receptor synthetic peptide octarphin (TPLVTLFK, specific activity 28 Ci/mmol) was prepared. The [3H]octarphin binding to rat myocardium membranes before and after experimental myocardial infarction (EMI) was studied. It was found that [3H]octarphin with high affinity and specificity binds to non-opioid β-endorphin receptor of rat myocardium membranes before EMI: K d1 value of the [3H]octarphin specific binding to membranes was 1.8 ± 0.2 nM. In 3 h after EMI a sharp lowering in affinity of the binding is observed (K d2 = 13.3 ± 0.4 nM), and in 48 h its almost complete restoration (K d4 = 2.2 ± 0.3 nM). The results indicate participation of non-opioid β-endorphin receptor in the regulation of myocardial activity.
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Abbreviations
- ECG:
-
electrocardiogram
- EMI:
-
experimental myocardial infarction
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Original Russian Text © Y. N. Nekrasova, Y. A. Zolotarev, E. V. Navolotskaya, 2011, published in Biokhimiya, 2011, Vol. 76, No. 12, pp. 1659–1664.
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Nekrasova, Y.N., Zolotarev, Y.A. & Navolotskaya, E.V. Interaction of synthetic peptide octarphin with rat myocardium membranes. Biochemistry Moscow 76, 1337–1341 (2011). https://doi.org/10.1134/S0006297911120066
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DOI: https://doi.org/10.1134/S0006297911120066