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. 1991 Feb;35(2):351–357. doi: 10.1128/aac.35.2.351

Endotoxin-tobramycin additive toxicity on renal proximal tubular cells in culture.

V Joly 1, Y Bergeron 1, M G Bergeron 1, C Carbon 1
PMCID: PMC245004  PMID: 1673835

Abstract

Aminoglycoside-induced renal damage is enhanced in animals with Escherichia coli pyelonephritis. Bacterial endotoxin is liberated during antibiotic therapy. The toxic effect of endotoxin and tobramycin, alone or in combination, was investigated in primary cultures of rabbit proximal tubular cells grown to confluence in serum-free medium. Sodium-dependent uptakes of Pi and alpha-methylglucopyranoside (MGP) and enzymatic activities (lactate dehydrogenase [LDH] released as a marker of cell necrosis and gamma-glutamyltransferase [GGT] and N-acetyl-beta-D-glucosaminidase [NAG] present in the homogenate as markers of brush border membrane and lysosome integrity) were measured. Cells were exposed to (i) endotoxin (20 mg/liter), tobramycin (1 mM), or endotoxin plus tobramycin for 48 h, or (ii) endotoxin (100 mg/liter), tobramycin (4 mM), or endotoxin plus tobramycin for 72 h. Endotoxin alone did not alter Pi uptake, but tobramycin inhibited Pi uptake through a decrease in Vmax. The effect was not enhanced by the combination of endotoxin and tobramycin. Endotoxin and tobramycin alone exerted no significant effect upon MGP uptake, but strong inhibition of the Vmax was observed after exposure to a combination of endotoxin plus tobramycin, without alteration of the Km. Endotoxin decreased residual GGT activity in the cell homogenate. Tobramycin increased LDH release in the medium and NAG activity in the homogenate. Endotoxin plus tobramycin resulted in an additive effect upon LDH and NAG activities. In conclusion, by disturbing apical membrane integrity, endotoxin increased tobramycin toxicity in vitro in the absence of serum hormonal mediator.

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Selected References

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