Cytotoxicity-related alterations of selected cellular functions after in vitro vanadate exposure

• Published in: Biochemical pharmacology Vol. 34; no. 14; p. 2465
• Main Authors: Bracken, W M, Sharma, R P
• Format: Journal Article
• Language: English
• Published: England 15.07.1985
• Subjects: Alkaline Phosphatase - analysis; Animals; Cattle; Cell Line; Cell Survival - drug effects; DNA - analysis; Glutathione - analysis; Kidney - drug effects; Proteins - analysis; Vanadates; Vanadium - toxicity
• ISSN: 0006-2952
• DOI: 10.1016/0006-2952(85)90527-1

A bovine kidney cell line was used to monitor select cellular functions for toxicity-dependent alterations in an effort to examine the cellular response to vanadium insult. The vanadium concentrations utilized ranged between 20 and 500 microM Na3VO4 (V) and elicited 15-60% cytotoxicity. Cytotoxicity-related decreases in thymidine incorporation into DNA and leucine incorporation into protein were noted. Paradoxically, V-treated cultures exhibited increased protein and DNA content, suggestive of a decrease in precursor transport. K+-dependent phosphatase (KP), acid phosphatase (AP) and succinate dehydrogenase (SDH) were monitored in surviving cells and in a cell-free system. Significant inhibitions were detected for KP and AP; SDH exhibited slight enhancement. In the cell-free system, KP was inhibited significantly at 10(-7) M V, while AP and SDH were either unchanged or sensitive only at concentrations of 10(-4) M V or greater. Measurement of reduced glutathione (GSH) in surviving cells revealed toxicity-dependent increases of up to 500% of control values. When compared to the cellular V content, the GSH:V molar ratio decreased from 1.7 to 0.5 as cell survival decreased.