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- W2409478960 abstract "Cicletanine sulfate was tested on bicarbonate-dependent pHi changes in cultured vascular smooth muscle (A10 line). Cicletanine sulfate exhibited double reactivity with regard to the cell alkalinization induced by bicarbonate uptake. The analysis of 11 concentration-response curves revealed a high reactivity component (IC50 approximately 3.5 x 10(-8) mol/L) and a weak reactivity component (IC50 approximately 4 x 10(-4) ml/L). Regarding the cell acidification induced by bicarbonate extrusion, cicletanine sulfate exhibited a single high reactivity component (IC50 = 5.9 +/- 2.9 x 10(-7) mol/l; mean +/- SD, n = 7). The high and weak reactivity sites were both sensitive to DIDS. Analysis of the data strongly suggested that the highly reactive site corresponds to a sodium-independent (Cl-/HCO3-] exchanger, which catalyzes net bicarbonate efflux, and the weak-reactivity site corresponds to the inwardly directed sodium-dependent [Cl-/HCO3-] exchanger. Three cell growth factors--epidermal growth factor, arginine-vasopressin, and insulin--were able to stimulate the sodium-independent [Cl-/HCO3-] exchanger in A10 cells. Finally, cicletanine sulfate (30 mumol/L) partially inhibited serum-dependent A10 cell growth. In conclusion, cicletanine sulfate and cell growth factors exert opposite effects (inhibition and stimulation, respectively) on the sodium-independent [Cl-/HCO3-] exchanger in cultured vascular smooth muscle. The effect of cicletanine sulfate on the sodium-independent [Cl-/HCO3-] exchanger may account for the ability of cicletanine to favorably alter vascular pathology in spontaneously hypertensive rat (SHR) models." @default.
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- W2409478960 date "1993-08-01" @default.
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- W2409478960 title "Opposite Effects of Cell Growth Factors and Cicletanine Sulfate on the Sodium-Independent [C1~/HC03~] Exchange in Cultured Vascular Smooth Muscle" @default.
- W2409478960 doi "https://doi.org/10.1093/ajh/6.8.674" @default.
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