Abstract
1 Adrenergic responsiveness may be an important determinant of peripheral resistance in man. We have demonstrated that vascular β-adrenergic responsiveness is reduced in young borderline hypertensive subjects. A parallel defect in β-adrenergic mediated adenylyl cyclase activity and β-adrenoceptor affinity for agonists also has been identified in lymphocytes from borderline hypertensive subjects. In contrast, it is unclear whether cardiac β-adrenergic responsiveness is altered.
2 The reduction in lymphocyte and vascular β-adrenergic responsiveness is corrected when hypertensive subjects are fed a low sodium chloride diet. This pattern of regulation differs from that seen in young normotensive subjects fed a low NaCl diet where either reduced or unchanged β-adrenergic responsiveness has been reported.
3 These studies suggest a generalized defect in β2-adrenergic responsiveness in borderline hypertensive subjects and demonstrate important differences between normotensive and hypertensive subjects in the pattern of β-adrenoceptor regulation mediated by dietary sodium intake. The mechanism by which dietary sodium modulates β-adrenergic responsiveness is yet to be determined.
Keywords: adenylyl cyclase, β-adrenoceptors, hypertension, sodium
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Selected References
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