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  • Title: Action of (1-des(aspartic acid), 8-isoleucine) angiotensin II upon the pressor and steroidogenic activity of angiotensin II.
    Author: Bravo EL, Khosla MC, Bumpus FM.
    Journal: J Clin Endocrinol Metab; 1975 Mar; 40(3):530-3. PubMed ID: 234979.
    Abstract:
    The vascular and steroidogenic responses to (1-Sarcosine, 8-Isoleucine)-, and to (1-Des (Aspartic acid), 8-Isoleucine) angiotensin II were compared in bilaterally nephrectomized, ACTH-suppressed dogs receiving constant infusions of angiotensin II. Aldosterone secretion rate was significantly inhibited by pretreatment with 200 ng/Kg/min of the heptapeptide, (1-Des(Aspartic acid), 8-Isoleucine) ang II, but not by similar doses of the octapeptide, (1-Sarcosine, 8-Isoleucine) ang II. In contrast, the pressor action of ang II was unaffected by (1-Des (Aspartic acid), 8-Isoleucine) ang II though significant inhibition occurred with relatively small doses of (1-Sarcosine, 8-Isoleucine) ang II. This study suggests that: (a) angiotensin receptors in adrenal cortex and vascular smooth muscle are functionally different, and (b) (1-Des(Aspartic acid),8-Isoleucine) angiotensin II is a specific antagonist of steroidogenic effect of ang II.
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