Renin and angiotensins in cultured mouse adrenocortical tumour cells.

Mouse adrenal tissue has been reported to contain high renin activity. However, it is not clear whether the renin is produced inside the tissue or is derived from a blood-borne component. We have investigated a cloned cell line of mouse adrenocortical tumour (Y-1) which has a steroidogenic activity. Sizable quantities of renin were demonstrated, predominantly in the cell lysate. This renin activity was distinguished from cathepsin D in view of its specific affinity to anti-renin antibody, optimal pH was determined, and the substrate specificity was checked with haemoglobin. Immunoreactive angiotensins were also detectable, but were demonstrated both in the cell and in the culture medium. This study provides further evidence for the existence of renin intrinsic to the adrenal gland. This study also suggests an intracellular role for renin and possible secretion of generated angiotensins.