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High activity of renin was demonstrated in human neuroblastoma tissue. This activity was inhibited by specific antibody raised against human renal renin, indicating that it was not due to the nonspecific action of proteases. The specific activity of renin was 122.8 ng of angiotensin I generated mg of protein-1 h-1. It shared some biochemical features with well-known kidney renin, such as molecular weight, optimum pH, the presence of trypsin-activatable inactive renin, and glycoprotein nature. Furthermore, angiotensin-converting enzyme (ACE) activity (2.64 nmol mg of protein-1 min-1) was found in the tissue. This activity was inhibited by captopril, a specific ACE inhibitor, or by omission of chloride ion. These results suggest that true renin in addition to ACE exists in human neuroblastoma tissue.
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