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Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction.

Publication ,  Journal Article
Cittadini, A; Grossman, JD; Napoli, R; Katz, SE; Strömer, H; Smith, RJ; Clark, R; Morgan, JP; Douglas, PS
Published in: J Am Coll Cardiol
April 1997

OBJECTIVES: We sought to investigate the cardiac effects of growth hormone (GH) administration during the early phase of pathologic remodeling in a rat model of large myocardial infarction (MI). BACKGROUND: Recent evidence suggests that exogenous administration of GH evokes a hypertrophic response and increases left ventricular (LV) function in vivo in rats with normal or chronically failing hearts. We hypothesized that these effects would attenuate ventricular remodeling early after MI. METHODS: Fifty-eight male rats underwent sham operation (n = 19) or had induced MI (n = 39). The day after the operation, the infarcted rats were randomized to receive 3 weeks of treatment with GH, 3 mg/kg body weight per day (n = 19) or placebo (n = 20). Echocardiography, catheterization and isolated whole heart preparations were used to define cardiac structure and function. RESULTS: Growth hormone caused hypertrophy of the noninfarcted myocardium in a concentric pattern, as noted by higher echocardiographic relative wall thickness at 3 weeks and by morphometric histologic examination. Left ventricular dilation was reduced in the GH-treated versus placebo group (echocardiographic LV diastolic diameter to body weight ratio 2.9 +/- 0.1 vs. 3.5 +/- 0.2 cm/kg; p < 0.05). In vivo and in vitro cardiac function was improved after GH treatment. Despite elevated insulin-like growth factor-1 (IGF-1) serum levels in GH-treated rats, myocardial IGF-I messenger ribonucleic acid was not different among the three groups, suggesting that an increase in its local expression does not appear necessary to yield the observed effects. CONCLUSIONS: These data demonstrate that early treatment of large MI with GH attenuates the early pathologic LV remodeling and improves LV function.

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Published In

J Am Coll Cardiol

DOI

ISSN

0735-1097

Publication Date

April 1997

Volume

29

Issue

5

Start / End Page

1109 / 1116

Location

United States

Related Subject Headings

  • Ventricular Function, Left
  • Rats, Sprague-Dawley
  • Rats
  • RNA, Messenger
  • Myocardium
  • Myocardial Infarction
  • Male
  • Insulin-Like Growth Factor I
  • In Vitro Techniques
  • Immunoblotting
 

Citation

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Cittadini, A., Grossman, J. D., Napoli, R., Katz, S. E., Strömer, H., Smith, R. J., … Douglas, P. S. (1997). Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction. J Am Coll Cardiol, 29(5), 1109–1116. https://doi.org/10.1016/s0735-1097(97)00010-7
Cittadini, A., J. D. Grossman, R. Napoli, S. E. Katz, H. Strömer, R. J. Smith, R. Clark, J. P. Morgan, and P. S. Douglas. “Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction.J Am Coll Cardiol 29, no. 5 (April 1997): 1109–16. https://doi.org/10.1016/s0735-1097(97)00010-7.
Cittadini A, Grossman JD, Napoli R, Katz SE, Strömer H, Smith RJ, et al. Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction. J Am Coll Cardiol. 1997 Apr;29(5):1109–16.
Cittadini, A., et al. “Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction.J Am Coll Cardiol, vol. 29, no. 5, Apr. 1997, pp. 1109–16. Pubmed, doi:10.1016/s0735-1097(97)00010-7.
Cittadini A, Grossman JD, Napoli R, Katz SE, Strömer H, Smith RJ, Clark R, Morgan JP, Douglas PS. Growth hormone attenuates early left ventricular remodeling and improves cardiac function in rats with large myocardial infarction. J Am Coll Cardiol. 1997 Apr;29(5):1109–1116.
Journal cover image

Published In

J Am Coll Cardiol

DOI

ISSN

0735-1097

Publication Date

April 1997

Volume

29

Issue

5

Start / End Page

1109 / 1116

Location

United States

Related Subject Headings

  • Ventricular Function, Left
  • Rats, Sprague-Dawley
  • Rats
  • RNA, Messenger
  • Myocardium
  • Myocardial Infarction
  • Male
  • Insulin-Like Growth Factor I
  • In Vitro Techniques
  • Immunoblotting