Neutral endopeptidase is activated in cardiomyocytes in human aortic valve stenosis and heart failure.

Abstract:

BACKGROUND:The regulation of the cardiac neutral endopeptidase (EC 24.10, NEP) that degrades bradykinin and natriuretic peptides has been investigated in human cardiac hypertrophy and heart failure. Methods and Results- NEP mRNA was quantitated by real-time polymerase chain reaction (PCR) in left ventricular biopsies from patients with aortic valve stenosis (AS, n=19) and heart failure due to dilated cardiomyopathy (DCM, n=14), and control subjects with normal systolic function (CON, n=14). Left ventricular NEP mRNA content was increased 3-fold in AS (P<0.005) and 4.1-fold in DCM (P<0.002). The increase in NEP mRNA was related to the increase in end diastolic pressure in AS and DCM. In a second series, myocardial NEP enzymatic activity was determined. It increased 3.6-fold in AS (P<0.02) and 4-fold in DCM (P<0.002). NEP was localized in the myocardium by immunofluorescence microscopy and in situ PCR to myocytes and nonmyocyte areas and cells. CONCLUSIONS:Elevated cardiac NEP activity in pressure loaded and failing human hearts may increase the local degradation of bradykinin and natriuretic peptides.

journal_name

Circulation

journal_title

Circulation

authors

Fielitz J,Dendorfer A,Pregla R,Ehler E,Zurbrügg HR,Bartunek J,Hetzer R,Regitz-Zagrosek V

doi

10.1161/hc0302.103593

subject

Has Abstract

pub_date

2002-01-22 00:00:00

pages

286-9

issue

3

eissn

0009-7322

issn

1524-4539

journal_volume

105

pub_type

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