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  • Title: Metabolism and subcellular localization of angiotensin converting enzyme in cultured human monocytes.
    Author: Rohrbach MS.
    Journal: Biochem Biophys Res Commun; 1984 Nov 14; 124(3):843-9. PubMed ID: 6095825.
    Abstract:
    The enhancement of monocyte ACE activity during culture by autologous T-lymphocytes was shown to be due to a stimulation of the rate of ACE synthesis. The rate of synthesis increased from 0.020 mU/10(6) monocytes/hr in monocytes cultured alone to 0.063 mU/10(6) monocytes/hr in monocytes co-cultured with T-lymphocytes. The presence of T-lymphocytes during culture did not alter the rate of ACE degradation observed in monocytes cultured alone. The ACE induced in monocytes by T-lymphocytes appears to be an ecto-enzyme. Brief exposure to diazosulfanilic acid (10(-3) M) and papain (250 micrograms/ml) reduced ACE activity 89% and 66%, respectively, without appreciably altering the activity of the cytosolic enzyme, lactate dehydrogenase.
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