The evolution of β-adrenergic dysfunction during the induction of canine cobalt cardiomyopathy

Donald V. Unverferth*, Richard H. Fertel, James Thomas, Carl V. Leier, Richard Croskery, Robert Hunsaker, Michael Miller, Lorraine Gibb, Robert Hamlin

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

14 Scopus citations

Abstract

Summary: This study was designed to investigate the changes in the beta adrenergic system during the induction of cobalt cardiomyopathy in dogs. Cobalt sulphate, at a dose of 5 mg·kg-1·day-1 was administered intravenously with a low protein, low thiamine diet to 13 dogs. The percentage change of the left ventricular minor axis with systole by echocardiogram (%δD) and dP/dtmax were used to monitor left ventricular function. Noradrenaline (NA) was measured in 24 h urine samples. Left ventricular (LV) free wall biopsies were assayed for noradrenaline (LV-NA), cyclic AMP, cyclic GMP and dopamine beta hydroxylase (LV-DBH). Lymphocytes were assayed for β-receptor density. All dogs were studied at baseline and seven were studied after a midpoint cumulative dose of 60 to 90 mg·kg-1 of cobalt; the remaining six dogs were studied when they were in heart failure and had received more than 110 mg·kg-1. During the induction of heart failure the heart rate rose from 112±6 (X±SE) at baseline to 154±9 at the midpoint and 153±9 (both P<0.05) at the final measurement while the %δD fell from 35±2% to 31 ±3% and 23±2% (P<0.05) and dP/dt fell from 333±40 kPa·s-1 at baseline to 254±46 kPa·s-1 (P<0.05) and 207±33 kPa·s-1 (P<0.05). Urinary catecholamines rose significantly during the induction of heart failure while LV-NA fell from 117±27 pg·mg-1 tissue at baseline to 48±8 pg·mg-1 at the midpoint and 47± 15 pg·mg-1 at the final measurement (both P<0.05). The density of peripheral lymphocyte beta receptors also fell significantly while the ratio of myocardial cyclic AMP/cyclic GMP fell from 243 ±56 at baseline to 60± 12 (P<0.01) at the midpoint and 46±8 (P<0.01) at the final measurement. These data indicate that aberrations in beta adrenergic function inhibit vital support mechanisms to the cardiovascular system during heart failure.

Original languageEnglish (US)
Pages (from-to)44-50
Number of pages7
JournalCardiovascular Research
Volume18
Issue number1
DOIs
StatePublished - Jan 1 1984

Keywords

  • Beta receptors
  • Catecholamines
  • Cyclic nucleotides
  • Heart failure

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Fingerprint Dive into the research topics of 'The evolution of β-adrenergic dysfunction during the induction of canine cobalt cardiomyopathy'. Together they form a unique fingerprint.

Cite this