Vascular A10 cell membranes contain an endothelin metabolizing neutral endopeptidase.

Abstract:

:We have investigated the possible presence of endothelin-metabolizing neutral endopeptidase (NEP, EC 3.4.24.11) on A10 cell membranes using [125I]-ET-1 binding and direct measurements of NEP. NEP activity of A10 cell membranes has been compared to that of solubilized rat kidney brush border membranes (KNEP). Specific [125I]-ET-1 (50 pM) binding (defined with 100 nM ET-1) to A10 cell membranes was increased in a concentration dependent manner by the selective NEP inhibitors thiorphan, phosphoramidon, and SQ 28,603 [(+/-)-N-[2-(mercaptomethyl)-1-oxo-3-phenylpropyl]-beta-alanine] with EC50 values of 9.4, 28.4, and 5.7 nM respectively. At equilibrium (150 min), 70% more specific binding was apparent in the presence of these inhibitors. Phosphoramidon (2 microM) did not alter Bmax values, but it decreased the apparent KD for [125I] ET-1 from 63 (+/- 3) to 27 (+/- 2) pM. Thiorphan, phosphoramidon, and SQ 28,603 inhibited A10 cell NEP activity with IC50 values of 5.3, 36.5, and 6.0 nM respectively, which was similar to values obtained with KNEP (3.6, 22.6, and 3.5 nM). ET-1 inhibited A10 cell NEP, and KNEP with IC50 values of 30 and 21.3 microM respectively. The order of inhibitory potencies: ET-3 greater than ET-1 = ET-2 greater than or equal to sarafotoxin-6b was similar for both systems. These data suggest A10 cell membranes contain a NEP which has similar characteristics to NEP 24.11, and which actively metabolizes [125I]-ET-1.

authors

Dickinson KE,Tymiak AA,Cohen RB,Liu EC,Webb ML,Hedberg A

doi

10.1016/0006-291x(91)90941-y

subject

Has Abstract

pub_date

1991-04-15 00:00:00

pages

423-30

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(91)90941-Y

journal_volume

176

pub_type

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