Studies of the in vitro human plasma degradation of methionine-enkephalin

General Pharmacology
A D MosnaimS Diamond

Abstract

1. Incubation of [3H]tyrosine methionine-enkephalin (6 x 10(-9) M final concentration) with human platelet-poor plasma (1:9 ratio to Trizma Base buffer, pH 7.4) results mostly (greater than 95%) in hydrolysis of the tyrosyl-glycine peptide bond. This enzymatic reaction is essentially completed within 90 min, showing a half-life, Km and Vmax of 12.8 +/- 2.5 min, 0.70 +/- 0.01 mM and 17.90 +/- 1.05 mumol/L/min, respectively. These values are comparable to those previously reported for the human plasma degradation of leucine-enkephalin. 2. As expected hydrolysis of the methionine-enkephalin tyrosyl-glycine peptide bond was blocked by the known aminopeptidase inhibitors bestatin and puromycin (IC50 1.2 +/- 0.4 and 4.3 +/- 2.4 microM, respectively) but not by either thiorphan or captopril. 3. Neither the storing (up to 60 days) nor the freezing and thawing (up to ten times during a 60 days periods) significantly changed the above kinetic parameters, showing the stability of the plasma methionine-enkephalin degrading aminopeptidase.

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Citations

Jul 16, 2010·Journal of Paediatrics and Child Health·Olivier W V van den BrinkSalvatore Pepe
Jul 13, 2016·Journal of the American Society of Nephrology : JASN·Christina-Alexandra SchulzMarju Orho-Melander
Sep 15, 2010·American Journal of Therapeutics·Aron D MosnaimMarion E Wolf
Mar 22, 2008·American Journal of Therapeutics·Aron D MosnaimMarion E Wolf
Jan 25, 2020·Clinical and Applied Thrombosis/hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis·Philipp GruberMira Katan
Jul 17, 2013·Experimental Biology and Medicine·Ian S ZagonPatricia J McLaughlin
Aug 7, 2007·Neurochemical Research·Aron David MosnaimMarion E Wolf

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