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Wang, D.H. et al.

Wang, Qiu, Hu, Du,

Regulation of type 1 angiotensin II receptor in adrenal gland: role of alpha1-adrenoreceptor.

We have previously shown that sodium restriction upregulates the genes encoding angiotensin II receptor ( AT1) subtypes, AT1A and AT1B, in the adrenal gland and that this upregulation is mediated by activation of the AT1 receptor. There are multiple interactions between the renin-angiotensin and the adrenergic nervous systems; thus, we conducted the present experiment to investigate whether low sodium-induced upregulation of adrenal AT1A and AT1B is modulated by the alpha1-adrenoreceptor. Seven-week-old male Wistar rats were divided into four groups and given normal sodium diet (0.5%, NS), NS+prazosin (3.5 microg x kg(-1) x min(-1) by osmotic pump), low sodium diet (0.07%, LS), or LS+prazosin. Body weight and mean arterial pressure were not modified over the 2 weeks of treatment (P>.05). Pressor responses to bolus injection of the alpha1-agonist phenylephrine were inhibited in both prazosin groups, compared with NS and LS rats (P<.05). Adrenal AT1A mRNA, determined by Northern blot analysis, was increased in LS (P<.05) but not in NS+prazosin (P>.05), compared with NS. Prazosin enhanced the LS-induced increase of AT1A mRNA (P<.05). Adrenal AT1B mRNA was increased in both LS and NS+prasozin rats, compared with NS rats (P<.05). Prazosin also enhanced the LS-induced increase in AT1B mRNA (P<.05). Therefore, blockade of alpha1-adrenoreceptor results in an enhancement of LS-induced upregulation of adrenal mRNA for AT1A and AT1B. These data suggest that the sympathetic nervous system exerts an inhibitory action, via activation of the alpha1-adrenoreceptor, on AT1A and AT1B gene expression in the adrenal gland during sodium depletion.[1]

References

Regulation of type 1 angiotensin II receptor in adrenal gland: role of alpha1-adrenoreceptor. Wang, D.H., Qiu, J., Hu, Z., Du, Y. Hypertension (1997) [Pubmed]

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