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Endocrinology, Vol 130, 2971-2977, Copyright © 1992 by Endocrine Society
ARTICLES |
T Ogishima, H Suzuki, J Hata, F Mitani and Y Ishimura
Department of Biochemistry, School of Medicine, Keio University, Tokyo, Japan.
Zonal distribution of aldosterone synthase cytochrome P-450 and cytochrome P-45011 beta in rat adrenocortex was investigated immunochemically using specific antibodies to these enzymes. Localization of aldosterone synthase cytochrome P-450 (cytochrome P- 450aldo), a recently identified enzyme that converts deoxycorticosterone to aldosterone in rat adrenocortex was strictly confined to two or three outermost cell layers in the zona glomerulosa. In contrast, cytochrome P-45011 beta, which forms corticosterone, but not aldosterone, from deoxycorticosterone, was localized in the zona fasciculata-reticularis and not in the zona glomerulosa. Neither enzyme was detected in the medulla or the capsule. The functional zonation of adrenocortex with respect to aldosterone and corticosterone syntheses is, thus, ascribable to the localization of cytochromes P-450aldo and P- 45011 beta in the respective zones. When rats were maintained under Na- depleted conditions for 10 days, the zona glomerulosa cells containing cytochrome P-450aldo proliferated to 10-15 layers, the thickness of which was 5-7-fold that in the nonstimulated rats. Proliferation of the cytochrome P-450aldo-positive cells into the zona fasciculata- reticularis was also observed along with arterial walls. Under these conditions, no significant change in the distribution of cytochrome P- 45011 beta was noted. These results indicate that the angiotensin-II stimuli, which had been elicited by the low Na treatment, promoted proliferation of the glomerulosa cells, resulting in increased expression of cytochrome P-450aldo in rat adrenocortex.
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