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Acute nephropathy induced by gold sodium thiomalate: alterations in renal heme metabolism and morphology.

Abstract：

:Gold compounds are used clinically in rheumatoid arthritis therapy. Acute renal toxicity is observed in some patients receiving chrysotherapy. The present study addresses morphofunctional and biochemical changes in rat kidneys during the first 8 days following a single ip injection of gold sodium thiomalate (AuTM), one of the gold compounds presently in clinical use. Compared to controls, AuTM pretreatment resulted in increased urine output and elevated serum creatinine and urea nitrogen concentrations. Also, by Day 8, treated rats had decreased body weights and increased kidney weights. Postmortem examination on Day 1 showed pale and mottled kidneys and diffusely pale inner cortex. Microscopically, there was severe coagulative necrosis of the proximal tubular epithelium. Epithelial regeneration was prominent by Day 4 and was nearly complete by Day 8. The regenerating epithelium was hyperplastic with basophilic cytoplasm and pleomorphic nuclei. Alterations in renal heme biosynthesis and drug metabolism paralleled the morphologic changes. The activity of delta-aminolevulinic acid dehydratase and benzo[a]pyrene hydroxylase were inhibited on Days 1, 2, and 4 following AuTM administration. Decreases in monooxygenase activity were accompanied by decreases in renal cytochrome P-450 levels. In contrast, renal microsomal heme oxygenase activity was elevated 9.5-fold on Day 1 and 2.5-fold on Day 2. By Day 8, all renal enzymatic activities assayed for were similar to those obtained with untreated rats.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Eiseman JL,Ribas JL,Knight E,Alvares AP

doi

10.1016/0041-008x(87)90100-1

subject

Has Abstract

pub_date

1987-11-01 00:00:00

pages

193-203

issue

2

eissn

0041-008X

issn

1096-0333

pii

0041-008X(87)90100-1

journal_volume

91

pub_type

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