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Cytotoxicity-related alterations of selected cellular functions after in vitro vanadate exposure
Abstract:
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.
Insights
Vanadium (V) exposure caused significant cytotoxicity in bovine kidney cells, decreasing DNA and protein synthesis. However, cells paradoxically increased DNA and protein content, with altered enzyme activities and elevated glutathione levels.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Vanadium compounds are industrial pollutants with known toxicity.
- Understanding cellular responses to vanadium is crucial for risk assessment.
Purpose of the Study:
- To investigate the cellular effects of sodium vanadate (V) exposure in a bovine kidney cell line.
- To characterize toxicity-dependent alterations in cellular functions and biochemical markers.
Main Methods:
- Bovine kidney cells were exposed to varying concentrations of sodium vanadate (20-500 microM).
- Cytotoxicity, DNA and protein synthesis (thymidine and leucine incorporation), and enzyme activities (KP, AP, SDH) were measured.
- Reduced glutathione (GSH) levels and cellular vanadium content were quantified.
Main Results:
- Vanadium induced 15-60% cytotoxicity, with decreased DNA and protein synthesis.
- Cells showed increased DNA and protein content, suggesting altered precursor transport.
- KP and AP activities were inhibited, while SDH was enhanced in surviving cells.
- GSH levels increased up to 500% in a toxicity-dependent manner.
Conclusions:
- Vanadium exerts complex toxic effects on kidney cells, impacting synthesis, enzyme activity, and antioxidant defenses.
- Elevated GSH suggests an adaptive response to vanadium-induced oxidative stress.
- The observed changes highlight the multifaceted cellular response to vanadium insult.