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Viability Assays for Cells in Culture
Published on: January 20, 2014
Trimethyltin reduces ATP levels and MTT reduction in the LRM55 rat astrocytoma cell line
1Department of Pharmaceutical Sciences, The University of Montana, Missoula, MT 59812, USA. eyer@selway.umt.edu
Abstract:
The LRM55 rat astrocytoma cell line was used to study the time and concentration effects of trimethyltin (TMT) exposure on intracellular adenosine triphosphate (ATP) levels, formazan production from (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT), and lactate dehydrogenase (LDH) release. TMT concentrations of > or =50 microM produced a delayed increase in extracellular LDH from approximately 20% at 24 h to almost 70%, at 72 h. Twenty-four hours before cell lysis was detectable ATP levels decreased to less than 30% and formazan production declined to 70% (50 microM), 31% (100 microM), and 21% (200 microM) of control values. Concentrations of TMT (5 and 10 microM) that produced little or no LDH release also decreased ATP levels (62 and 49% of control, respectively) and formazan production (63 and 52% of control, respectively) by 48 h. These data support the hypothesis that TMT exposure interferes with energy production and that this event likely contributes to the delayed cell death seen in this cell line. Moreover, the declines in ATP and formazan production can occur at subtoxic concentrations in LRM55 cells.
Insights
Trimethyltin (TMT) exposure disrupts cellular energy production in rat astrocytoma cells, indicated by decreased adenosine triphosphate (ATP) and formazan production. These energy deficits precede cell death, even at subtoxic TMT concentrations.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Trimethyltin (TMT) is a neurotoxicant known to cause neuronal damage.
- Astrocytoma cell lines are utilized to model neuronal responses to toxic insults.
- Understanding the mechanisms of TMT toxicity is crucial for neuroprotection strategies.
Purpose of the Study:
- To investigate the time- and concentration-dependent effects of TMT on LRM55 rat astrocytoma cells.
- To assess the impact of TMT on intracellular adenosine triphosphate (ATP) levels, formazan production (MTT assay), and lactate dehydrogenase (LDH) release.
- To elucidate the relationship between energy metabolism disruption and TMT-induced cell death.
Main Methods:
- LRM55 rat astrocytoma cells were exposed to varying concentrations of TMT.
- Measurements included extracellular LDH release, intracellular ATP levels, and formazan production via MTT assay.
- Time-course experiments were conducted to observe delayed effects.
Main Results:
- TMT concentrations ≥50 µM induced a delayed increase in LDH release, peaking at 72 h.
- Significant decreases in ATP levels (<30%) and formazan production (21-70%) were observed 24 h before detectable cell lysis.
- Subtoxic TMT concentrations (5 and 10 µM) also reduced ATP and formazan production by 48 h, with minimal LDH release.
Conclusions:
- TMT exposure interferes with cellular energy production in LRM55 cells.
- Impaired energy metabolism is a key factor contributing to TMT-induced delayed cell death.
- Reductions in ATP and formazan production can serve as early indicators of TMT toxicity, occurring at subtoxic levels.
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