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• W2025274651 endingPage "1868" @default.
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• W2025274651 abstract "Modulation ofNa+-H+exchange (Na/H EXCH) by hormones and growth factors may be important in cell growth. We have previously shown that Na/H EXCH in adrenal glomerulosa cells is activated by angiotensin II (ANG II), a potent stimulator of aldosterone secretion. In the present paper, we have investigated the role of protein kinase C (PKC) in the activation of Na/H EXCH by ANG II. To accomplish this, we monitored cytosolic pH (pHi) in cells loaded with 2,7-bisearboxyethyl- 5(6)-carboxyflourescein and measured initial rates of 22Na uptake into glomerulosa cells in the presence or absence of dimethylamiloride. Both phorbol 12-myristate 13-acetate (PMA) and ANG II increased the activity of Na/H EXCH similarly when studied under basal conditions (pHi 7.1). This was accompanied by alkalinization of pHi and an increase in dimethylamiloride-sensitive Na+ influx. Study of kinetics of the antiporter activation showed that both ANG II and PMA led to an increase in the maximal rate (Vmax) and a decrease in the Michaelis-Menten constant (Km) for external Na+. The pHi dependence of Na+ influx was half-maximal (pK) at pH, 7.09 and remained unchanged in the presence of ANG II (pK 7.03) and PMA (pK 7.14). Depleting the cells of PKC by exposing them to PMA (1 μM) for 3 h caused a marked reduction in control and ANG II-stimulated Na+ influx and control pK (7.09 to 6.85, P < 0.05). However, with PKC depletion, the kinetics of Na/H EXCH (Vmax Km for external Na+ and pK) were unaffected by ANG II. Thus, Na/H EXCH in adrenal glomerulosa cells functions under basal conditions, and its relatively alkaline pK (7.09) is dependent upon PKC activity. In addition, the ANG II-induced activation of Na/H EXCH is modulated by PKC. These effects suggest an important role for PKC in pHi regulation of adrenal glomerulosa cells, particularly during ANG II stimulation of aldosterone secretion. (Endocrinology129: 1861–1868, 1991" @default.
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• W2025274651 date "1991-10-01" @default.
• W2025274651 modified "2023-10-15" @default.
• W2025274651 title "Angiotensin II-Induced Activation of Na⁺-H⁺Exchange in Adrenal Glomerulosa Cells Is Mediated by Protein Kinase C*" @default.
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• W2025274651 doi "https://doi.org/10.1210/endo-129-4-1861" @default.
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