Cardiac phenylethanolamine N-methyltransferase: localization and regulation of gene expression in the spontaneously hypertensive rat.

Phenylethanolamine N-methyltransferase (PNMT) is the terminal enzyme in the catecholamine biosynthetic pathway responsible for adrenaline biosynthesis. Adrenaline is involved in the sympathetic control of blood pressure; it augments cardiac function by increasing stroke volume and cardiac output. Genetic mapping studies have linked the PNMT gene to hypertension.

Regulation of the phenylethanolamine N-methyltransferase gene in the adrenal gland of the spontaneous hypertensive rat.

The catecholamine epinephrine is physiologically important in cardiac function and blood pressure regulation. Phenylethanolamine N-methyltransferase (PNMT) is the terminal enzyme in the catecholamine biosynthetic pathway, responsible for epinephrine biosynthesis, and is primarily localized in the adrenal gland. In hypertensive rats, adrenal PNMT mRNA, protein and enzyme activity are elevated along with elevated levels of epinephrine, suggesting that increased expression of PNMT in the adrenal gland results in the increased adrenergic function associated with hypertension.