Increased gene expression of catecholamine-synthesizing enzymes in adrenal glands contributes to high circulating catecholamines in pigs with tachycardia-induced cardiomyopathy.
J Physiol Pharmacol
; 66(2): 227-31, 2015 Apr.
Article
em En
| MEDLINE
| ID: mdl-25903953
ABSTRACT
High levels of circulating catecholamines have been established as fundamental pathophysiological elements of heart failure (HF). However, it is unclear whether the increased gene expression of catecholamine-synthesis enzymes in the adrenal glands contributes to these hormone abnormalities in large animal HF models. We analyzed the mRNA levels of catecholamine-synthesizing enzymes tyrosine hydroxylase (TH), aromatic L-amino acid decarboxylase (AAAD), dopamine-ß-hydroxylase (DBH) and phenylethanolamine N-methyltransferase (PNMT) in adrenal glands of 18 pigs with chronic systolic non-ischaemic HF (tachycardia-induced cardiomyopathy due to right ventricle pacing) and 6 sham-operated controls. Pigs with severe HF demonstrated an increased expression of TH and DBH (but neither AAAD nor PNMT) as compared to animals with milder HF and controls (P<0.05 in all cases). The increased adrenal mRNA expression of TH and DBH was accompanied by a reduced left ventricle ejection fraction (LVEF) (P<0.001) and an elevated plasma B-type natriuretic peptide (BNP) (P<0.01), the other indices reflecting HF severity. There was a positive relationship between the increased adrenal mRNA expression of TH and DBH, and the high levels of circulating adrenaline and noradrenaline (all P<0.05). The association with noradrenaline remained significant also when adjusted for LVEF and plasma BNP, suggesting a significant contribution of adrenals to the circulating pool of catecholamines in subjects with systolic HF.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Taquicardia
/
Catecolaminas
/
Expressão Gênica
/
Glândulas Suprarrenais
/
Cardiomiopatias
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
J Physiol Pharmacol
Assunto da revista:
FARMACOLOGIA
/
FISIOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Polônia