Potentiation of angiotensin II-stimulated phosphoinositide hydrolysis, calcium mobilization and contraction of renal mesangial cells upon down-regulation of protein kinase C

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Abstract

Long-term pretreatment of rat mesangial cells with 12-O-tetradecanoylphorbol 13-acetate (TPA) down-regulated protein kinase C activity and potentiated the angiotensin II-induced inositol trisphosphate (InsP3) formation. This increased response to angiotensin II occurred without a significant change in the receptor number or Kd value of angiotensin II binding to the cells. The biologically inactive phorbol ester 4α-phorbol 12,13-di-decanoate was without effect on angiotensin II-stimulated InsP3 generation. Long-term pretreatment with TPA also increased the angiotensin II-induced mobilization of Ca2+ and the subsequent contraction of mesangial cells. © 1990.

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Pfeilschifter, J., Fandrey, J., Ochsner, M., Whitebread, S., & de Gasparo, M. (1990). Potentiation of angiotensin II-stimulated phosphoinositide hydrolysis, calcium mobilization and contraction of renal mesangial cells upon down-regulation of protein kinase C. FEBS Letters, 261(2), 307–311. https://doi.org/10.1016/0014-5793(90)80578-7

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