Abstract
Renal cortical prostaglandin synthesis, particularly by arterioles and glomeruli, is important to preserve renal blood flow (RBF) and glomerular filtration rate (GFR). Glomeruli and arterioles synthesize not only the vasodilatory prostaglandins PGE2 and PGI2, but also the vasoconstrictor, thromboxane A2. The primary renal cortical actions of these prostaglandins are renal vasodilatation and maintenance of GFR (PGE2 and PGI2) or renal vasoconstriction and reduction of GFR (thromboxane A2). Vasodilatory renal prostaglandins are relatively unimportant under normal circumstances but play a modulatory role after ischemia or in the presence of increased concentrations of vasoconstrictor substances such as angiotensin II (ANG II), vasopressin or norepinephrine. ANG II and vasopressin stimulate the synthesis of PGE2 in rat glomerular epithelial and mesangial cells maintained in cell culture. These stimulatory actions of constrictor peptides are dependent upon calcium entry into the cells since removal of extracellular calcium or co-incubation with verapamil or nifedipine block the prostaglandin stimulatory capacity of ANG II or vasopressin. In vivo indomethacin potentiates the actions of ANG II on the kidney, particularly the reduction of RBF and GFR. Isolated rat glomeruli contract in response to ANG II and this contractile effect, which reflects reduction in glomerular filtration surface area, can be potentiated by cyclooxygenase blockade. Conversely, arachidonic acid reduces the glomerular contractile effect of ANG II. The importance of renal prostaglandins in support of RBF and GFR has been studied in dogs after chronic bile duct ligation (CBDL). CBDL dogs have significant increase in renal PGE2 and PGI2 which maintain RBF and GFR since cyclo-oxygenase inhibition resulted in a 50% decrease in both RBF and GFR. Indomethacin, ibuprofen, naproxen, and sulindac sulfide had comparable effects. The pro-drug, sulindac sulfoxide, was tested in normal volunteers and found to spare renal prostaglandin synthesis whereas indomethacin reduced renal synthesis of PGE2 and PGF2α by more than 50%. In vitro, sulindac sulfide is a potent inhibitor of renal prostaglandin synthesis by kidney cells in culture. It is, therefore, concluded that renal prostaglandins play an important vasoregulatory role. Furthermore, sulindac sulfoxide may spare renal cyclo-oxygenase and thereby preserve renal function.
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Abbreviations
- PGE2, PGI2, etc.:
-
Prostaglandin E2, I2, etc.
- ANG II:
-
angiotensin II
- TxA2 :
-
thromboxane A2
- RBF:
-
renal blood flow
- GFR:
-
glomerular filtration rate
- CBDL:
-
chronic bile duct ligation
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© 1984 Springer-Verlag
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Dunn, M.J., Scharschmidt, L., Zambraski, E. (1984). Mechanisms of the Nephrotoxicity of Non-steroidal Anti-inflammatory Drugs. In: Chambers, P.L., Preziosi, P., Chambers, C.M. (eds) Disease, Metabolism and Reproduction in the Toxic Response to Drugs and Other Chemicals. Archives of Toxicology, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69132-4_56
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DOI: https://doi.org/10.1007/978-3-642-69132-4_56
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