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Hypertension, Vol 19, 263-269, Copyright © 1992 by American Heart Association

ARTICLES

Effect of angiotensin II on renin production by rat adrenal glomerulosa cells in culture

T Yamaguchi, R Franco-Saenz and PJ Mulrow
Department of Medicine, Medical College of Ohio, Toledo 43699.

Angiotensin II (Ang II) inhibits renin secretion and production from the kidney, but the effect of Ang II on adrenal renin is not clear. Nephrectomy, via elevated plasma adrenocorticotropic hormone (ACTH) and potassium, is a strong stimulator of adrenal renin production in the rat. This stimulation is inhibited by the infusion of Ang II, suggesting a negative feedback between Ang II and adrenal renin. In the present study, we examined the effect of Ang II on adrenal renin using a primary culture of rat glomerulosa cells. Cells were exposed to ACTH (10(-11) M), high potassium (8 and 12 mM), db-cyclic AMP (db-cAMP), (10(-3) M), or Ang II (10(-11) to 10(-5) M) for 24 hours, and active renin and inactive renin were measured. Active renin was predominant in the cells, whereas inactive renin predominated in the medium. Ang II stimulated renin production in a dose-dependent fashion (cell-active renin, 1.21 +/- 0.20 to 2.39 +/- 0.16; medium-inactive renin, 2.59 +/- 0.40 to 6.14 +/- 0.49 ng Ang I/10(6) cells). Both ACTH and db-cAMP significantly stimulated active renin in the cells (ACTH, 1.73 +/- 0.14 to 9.44 +/- 0.98; db-cAMP, 1.45 +/- 0.16 to 3.96 +/- 0.71 ng Ang I/10(6) cells) and inactive renin in the medium (ACTH, 4.98 +/- 0.38 to 43.7 +/- 5.63; db-cAMP, 3.80 +/- 0.32 to 33.55 +/- 5.62 ng Ang I/10(6) cells). The addition of Ang II (10(-7) M) blunted the stimulation of renin production by both ACTH and db-cAMP by 60%. High potassium- stimulated renin production was not inhibited by Ang II.(ABSTRACT TRUNCATED AT 250 WORDS)

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