Authors: Carneiro-Ramos, M. S.¹; Diniz, G. P.²; Almeida, J.³; Vieira, R. L. P.³; Pinheiro, S. V. B.³; Santos, R. A.³; Barreto-Chaves, M. L. M.²

Source: The Journal of Physiology, Volume 583, Number 1, August 2007 , pp. 213-223(11)

Publisher: Wiley-Blackwell

Abstract:

This study assessed the behaviour of angiotensin II (Ang II) receptors in an experimental hypothyroidism model in male Wistar rats. Animals were subjected to thyroidectomy and resting for 14 days. The alteration of cardiac mass was evaluated by total heart weight (HW), right ventricle weight (RVW), left ventricle weight (LVW), ratio of HW, RVW and LVW to body weight (BW) and atrial natriuretic factor (ANF) expression. Cardiac and plasma Ang II levels and serum T₃ and T₄ were determined. The mRNA and protein levels of Ang II receptors were investigated by RT-PCR and Western blotting, respectively. Functional analyses were performed using binding assays. T₃ and T₄ levels and the haemodynamic parameters confirmed the hypothyroid state. HW/BW, RVW/BW and LVW/BW ratios and the ANF expression were lower than those of control animals. No change was observed in cardiac or plasma Ang II levels. Both AT1/AT2 mRNA and protein levels were increased in the heart of hypothyroid animals due to a significant increase of these receptors in the RV. Experiments performed in cardiomyocytes showed a direct effect promoted by low thyroid hormone levels upon AT1 and AT2 receptors, discarding possible influence of haemodynamic parameters. Functional assays showed that both receptors are able to bind Ang II. Herein, we have identified, for the first time, a close and direct relation of elevated Ang II receptor levels in hypothyroidism. Whether the increase in these receptors in hypothyroidism is an alternative mechanism to compensate the atrophic state of heart or whether it may represent a potential means to the progression of heart failure remains unknown.

Document Type: Research article

DOI: http://dx.doi.org/10.1113/jphysiol.2007.134080

Affiliations: 1: Cell and Developmental Biology 2: Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-900, Brazil 3: Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte 31270, Brazil

Publication date: 2007-08-01

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