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Histologically the mammalian adrenocortex consists of three zones: the glomerular, the fascicular, and the reticular. However, the origin and function of these zones are unknown, although there have been many investigations on the subject and theories have been suggested such as cell migration, the transformation theory, and the zonal theory (1). Namely, it has been proposed that each zone has a specific function in biosynthesis and secretion of adrenocortical hormone (2) or, on the contrary, that the zones are the result of these processes during the development of adrenocortical cells (3). To study the function of each zone it seems very useful to investigate the zonation of hemoprotein P-450, an important component of the mixed function oxidase systems for the hydroxylation of steroids (4, 5), The concentrations of hemoprotein P-450 or cytochrome bs per milligram protein of microsomes (6) or mitochondria (7) prepared from homogenates of whole adrenocortex have already been reported. However, the contents of hemoproteins in the different zones of the adrenocortex have not been studied.

ZONATION OF HEMOPROTEIN P-450 AND CYTOCHROME b5 IN THE ADRENOCORTEX OF MAMMALS