© 1999 by European Society of Cardiology
Copyright © 1999, European Society of Cardiology
Heterogeneous transmural gene expression of calcium-handling proteins and natriuretic peptides in the failing human heart
aAbteilung Kardiologie und Pneumologie, Georg-August-Universität Göttingen, D-37075 Göttingen, Germany
bAbteilung Kardiologie und Angiologie, Universität Freiburg, D-79106 Freiburg, Germany
* Corresponding author. Tel.: +49-551-39-6380; fax: +49-551-39-2953 jprestle{at}mdv.gwdg.de
Objective: Human heart failure is associated with a disturbed intracellular calcium (Ca2+) homeostasis. In this regard, ventricular wall stress is considered to be a determinant for expression of sarcoplasmic reticulum Ca2+-ATPase (SERCA2a). In the present study, we analyzed the transmural protein and/or mRNA levels of SERCA2a, other Ca2+-handling proteins, and of atrial and brain natriuretic peptides (ANP and BNP) in the human heart. Methods: Subepicardial (epi), midmyocardial (mid), and subendocardial (endo) sections of the left ventricular free wall from end-stage failing (n=17) and nonfailing (n=5) human hearts were analyzed by Western blot for immunoreactive protein levels of SERCA2a, phospholamban (PLN), and calsequestrin (CS). Subepi- and subendocardial sections were analyzed by Northern blot for steady-state mRNA levels of SERCA2a, Na+-Ca2+ exchanger (NCX1), ANP, and BNP. Results: SERCA2a protein and mRNA levels were reduced by 40±5% (P<0.01) and 25±7% (P<0.05) in endo compared to epi in the failing heart and by 27±14% and 16±12% (non-significant) in the nonfailing heart, respectively. PLN protein levels were reduced by 23±6% (P<0.05) in endo compared to epi in the failing heart and by 17±25% (non-significant) in the nonfailing heart, whereas CS protein levels and NCX1 mRNA levels were similar across the left ventricular wall. Strikingly, in the failing heart, both BNP and ANP mRNA levels were upregulated predominantly in endo. Conclusions: In the failing human heart, SERCA2a and PLN, as well as natriuretic peptides but not CS and NCX1 are differentially expressed across the left ventricular wall, implicating (1) different susceptibility of subendocardium and subepicardium to factors affecting expression of these proteins and (2) differences in regulation of the distinct calcium-cycling proteins.
KEYWORDS Human (Species); Experimental (Discipline); Heart (Object); Molecular biology (Level); Ca-pump; Gene expression; Heart failure; Na/Ca-exchanger; Natriuretic peptide
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