1
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Expression of endothelin-1, endothelin-converting enzyme, and endothelin receptors in chronic heart failure.

      Circulation

      Aspartic Acid Endopeptidases, genetics, Atrial Natriuretic Factor, DNA Primers, Down-Regulation, Endothelin-1, metabolism, Heart Failure, surgery, Heart Transplantation, Humans, Metalloendopeptidases, Myocardium, RNA, Messenger, Radioligand Assay, Receptor, Endothelin A, Receptor, Endothelin B, Receptors, Adrenergic, beta, Receptors, Endothelin, Reverse Transcriptase Polymerase Chain Reaction, Transcription, Genetic

      Read this article at

      ScienceOpenPubMed
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Elevated plasma levels of endothelin (ET)-1 have been reported in association with heart diseases, including heart failure. Furthermore, it has been suggested that ET-1 acts as a local autocrine/paracrine factor with biological activities such as vasoconstriction, mitogenesis, and inotropic effects on the heart. This study investigated alterations of ET-1, ET receptor, and endothelin-converting enzyme (ECE) expression in left ventricular myocardium from patients with end-stage heart failure. mRNA concentrations of ETA and ETB receptors, prepro-ET-1 (ppET-1), and ECE in left ventricles from nonfailing donors hearts (NF) and from patients with end-stage chronic heart failure (NYHA functional class IV) due to dilated cardiomyopathy (DCM) were compared by use of a competitive reverse transcription-polymerase chain reaction technique. There was no significant difference in mRNA expression for ppET-1, ECE-1, and ETA receptors, whereas a significant reduction of ETB-receptor mRNA was observed in DCM hearts. 125I-labeled ET-1 radioligand binding studies demonstrated a significant downregulation of ETB receptors, whereas ETA-receptor density was increased in membranes from DCM hearts. Phosphoramidon-sensitive ECE activity and immunodetectable amounts of ECE protein in left ventricular membrane preparations did not differ between NF and DCM hearts. Finally, immunoreactive ET-1 concentrations were increased in DCM hearts. The present study demonstrates changes in the ET-receptor expression pattern in favor of the ETA receptor in human end-stage heart failure. Furthermore, activation of the cardiac ET system with increased tissue ET-1 concentrations in the failing myocardium is observed. This is more likely due to decreased clearance than to increased synthesis, because ppET-1 gene expression and ECE activity are unchanged.

          Related collections

          Author and article information

          Journal
          10217651

          Comments

          Comment on this article