Importance of sympathetic activation for the expression of Na+-Ca2+ exchanger in end-stage failing human myocardium.

Abstract:

AIMS:In end-stage heart failure, an alteration in the expression of the Na+-Ca2+ exchanger has been reported. Regulation of its expression is largely unknown. We sought to find out whether Na+-Ca2+ exchanger in human heart failure is regulated by sympathetic activation. In addition, since Na+-Ca2+-exchange is electrogenic, we conjectured whether increased expression of Na+-Ca2+ exchanger is associated with an increased incidence of cardiac arrhythmias. METHODS AND RESULTS:Twenty-three patients suffering from end-stage cardiac failure were examined in the hours preceding cardiac transplantation. Plasma levels of norepinephrine, epinephrine, atrial natriuretic peptide, renin activity, aldosterone, tumour necrosis factor (TNF)-alpha, and TNF-receptors were measured. All parameters were elevated relative to 21 healthy control subjects. As determined by immunoblots, protein levels of the Na+-Ca2+ exchanger were increased by 56% and protein levels of sarcoplasmic reticulum (SR) Ca2+-ATPase were decreased by 20% in left ventricles of the explanted failing hearts. A significant correlation between protein and neurohumoral levels was exclusively found for the Na+-Ca2+ exchanger with norepinephrine (r=0.64; P=0.01). Recent Holter ECGs revealed that patients with sustained or non-sustained ventricular tachycardia (more than three consecutive beats) had significantly higher Na+-Ca2+ exchanger protein and plasma norepinephrine levels than patients with a maximum of two consecutive beats (Na+-Ca2+ exchanger: 109+/-10 vs 83+/-7, n=11 each, P<0.05; norepinephrine: 1359+/-159 vs 656+/-88 pg. ml(-1), n=9 each, P<0.001). CONCLUSIONS:Sympathetic activation may enhance the expression of Na+-Ca2+ exchanger in end-stage heart failure. The data support the hypothesis that increased Na+-Ca2+-exchange could favour malignant ventricular arrhythmias.

journal_name

Eur Heart J

journal_title

European heart journal

authors

Schillinger W,Schneider H,Minami K,Ferrari R,Hasenfuss G

doi

10.1053/euhj.2001.3044

subject

Has Abstract

pub_date

2002-07-01 00:00:00

pages

1118-24

issue

14

eissn

0195-668X

issn

1522-9645

pii

S0195668X01930441

journal_volume

23

pub_type

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