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Regulatory interactions between inducible nitric oxide synthase and eicosanoids in glomerular immune injury.

Abstract：

:In a rat model of glomerular immune injury induced by administration of anti-glomerular basement membrane antibody and resembling human rapidly progressive glomerulonephritis, we explored whether activation of inducible nitric oxide synthase (iNOS) regulates synthesis of eicosanoids originating from cyclooxygenation or lipoxygenation of arachidonic acid. At early stages (24 hr) of injury, inhibition of iNOS using the selective inhibitor L-N6-(1-iminoethyl) lysine (L-NIL) at doses sufficient to reduce urinary excretion of nitrate/nitrite, reduced glomerular synthesis of the prostaglandins PGE2 and PGI2, but had no effect on that of thromboxane A2 (TxA2). The syntheses of 5-hydroxyeicosatetraenoic acid (HETE), 15-HETE and leukotriene B4 (LTB4) were also reduced. That of 12-HETE remained unchanged. We also explored the effect of arachidonate cyclooxygenation and lipoxygenation eicosanoids on iNOS expression. Administration of the cyclooxygenase (COX) inhibitor, indomethacin, at doses sufficient to inhibit glomerular prostaglandin synthesis, increased iNOS mRNA levels in glomeruli. Administration of the 5-lipoxygenase (5-LO) inhibitor, MK-0591, at doses sufficient to inhibit glomerular LTB4 synthesis also increased iNOS mRNA. The effect of 5-LO inhibition on iNOS expression was more pronounced than that of COX inhibition. In nephritic animals given the iNOS inhibitor, L-NIL, or indomethacin proteinuria worsened. In those given the 5-lipoxygenase inhibitor there was no change in urine protein excretion. These observations point to regulatory interactions between the arachidonic acid and the L-arginine: NO pathways in glomerulonephritis. These interactions are of importance in considering antiinflammatory strategies based on inhibition of iNOS or of specific eicosanoids.

journal_name

Kidney Int

journal_title

Kidney international

authors

Lianos EA,Guglielmi K,Sharma M

doi

10.1046/j.1523-1755.1998.00791.x

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

645-53

issue

3

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)60440-9

journal_volume

53

pub_type

杂志文章

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