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Abstract
Previous studies have shown that platelet-activating factor (PAF) receptor blocking
has a protective effect on rabbit nephrotoxic nephritis (NTN). We examined whether
arachidonic acid (AA) metabolism is altered in NTN and whether a PAF receptor antagonist
has any influence on such changes. Rabbits injected with anti-glomerular basement
membrane antiserum in the heterologous phase had a markedly increased glomerular thromboxane
B2 (TxB2) production level, whereas no changes have been detected in glomerular 6-keto-prostaglandin
F1α (6-keto-PGF1α) and prostaglandin E2 (PGE2). During the autologous phase of the disease, the glomerular TxB2 level was even higher than in the heterologous phase. The level of 6-keto-PGF1α was significantly lower than normal, and the level of PGE2 was unchanged in respect to the basal values. The use of L-652,731 (a specific PAF
receptor antagonist) reversed the abnormal generation of AA metabolites at glomerular
level both in the heterologous and autologous phase of the disease. The effect of
L-652,731 on AA metabolism is likely to be an indirect result of the PAF receptor
blocking, because L-652,731 given to normal rabbits had no direct effect on glomerular
AA metabolism. To assess whether the beneficial effect of L-652,731 in NTN is at least
in part mediated by its capability of suppressing the excessive intrarenal synthesis
of thromboxane A2 (TxA2), we compared the effect of L-652,731 with that of a selective TxA2-synthase inhibitor (FCE-22178). FCE-22178 ameliorated the morphologic expression
of rabbit NTN and reduced function deterioration. The protective effect of L-652,731
on proteinuria in the autologous phase and on glomerular filtration rate in both phases
was superior to that of FCE-22178. We conclude that an excessive intraglomerular synthesis
of TxA2 occurs in rabbit NTN that can play a role in renal function deterioration. Both a
specific PAF receptor antagonist and a TxA2-synthase inhibitor reduced the exaggerated TxA2 synthesis and favorably influenced the evolution of the disease.
Abbreviations:
AA (arachidonic acid), GBM (glomerular basement membrane), GFR (glomerular filtration rate), KRB (Krebs Ringer phosphate buffer), NTN (nephrotoxic nephritis), NTS (nephrotoxic serum), PAF (platelet-activating factor), PGE2 (prostaglandin E2), PGI2 (prostacyclin (prostaglandin I2)), PRP (platelet-rich plasma), TAC (threshold aggregating concentration), TxA2 (thromboxane A2), TxB2 (thromboxane B2)To read this article in full you will need to make a payment
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Article info
Publication history
Accepted:
January 12,
1989
Received in revised form:
December 2,
1988
Received:
June 2,
1988
Identification
Copyright
© 1989 Published by Elsevier Inc.