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Dadun > Depósito Académico > CIMA (Centro de Investigación Médica Aplicada) > Área de Ciencias Cardiovasculares > Cardiopatía hipertensiva > DA - CIMA - Cardiovasculares - Cardiopatía hipertensiva - Artículos de Revista >

Altered cardiac expression of peroxisome proliferator-activated receptor-isoforms in patients with hypertensive heart disease
Authors: Goikoetxea, M.J. (María J.)
Beaumont, J. (Javier)
Gonzalez, A. (Arantxa)
Lopez, B. (Begoña)
Querejeta, R. (Ramón)
Larman, M. (Mariano)
Diez, J. (Javier)
Keywords: Hypertension
Heart failure
Peroxisome proliferator-activated receptor alpha
Issue Date: 2006
Publisher: Oxford University Press
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ISSN: 1755-3245
Citation: Goikoetxea MJ, Beaumont J, Gonzalez A, Lopez B, Querejeta R, Larman M, et al. Altered cardiac expression of peroxisome proliferator-activated receptor-isoforms in patients with hypertensive heart disease. Cardiovasc Res 2006 Mar 1;69(4):899-907.
OBJECTIVE: To investigate whether cardiac expression of the nuclear peroxisome proliferator-activated receptor alpha (PPARalpha) is altered in patients with hypertensive heart disease (HHD). METHODS: We studied endomyocardial septal biopsies from 24 patients with essential hypertension divided into three groups: 6 without left ventricular hypertrophy (LVH) (HT group), 10 with LVH (LVH group), and 8 with LVH and heart failure (HF) (HF group). The expression of two PPARalpha isoforms (the native active and the truncated inhibitory) was analyzed by Western blot and reverse transcription polymerase chain reaction (RT-PCR), and two PPARalpha target genes were evaluated by RT-PCR. Histomorphological features were evaluated in a second myocardial sample from LVH and HF groups. RESULTS: Whereas the expression of native PPARalpha protein was lower (p<0.05) in LVH and HF groups than in the HT group, truncated PPARalpha protein was overexpressed (p<0.001) in the HF group as compared with LVH and HT groups. The mRNA expression of native and truncated PPARalpha was similar in the three groups of hypertensives. In addition, a progressive decrease (p for trend<0.05) in the two PPARalpha target genes mRNA expression was observed among HT, LVH and HF groups. The amount of truncated PPARalpha protein correlates directly with cardiomyocytes apoptosis and inversely with cardiomyocytes density in patients with HHD. In addition, the expression of truncated PPARalpha protein was directly correlated with left ventricular volumes, and inversely with ejection fraction in all hypertensives. CONCLUSIONS: These findings suggest that post-transcriptional regulation of PPARalpha isoforms is altered in patients with HHD, namely in those developing HF. An excess of the truncated inhibitory isoform may be involved in hypertensive left ventricular failure and remodeling.
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