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Comparative Measurement of In Vitro T-2 Toxin Cytotoxicity using Three Different Cytotoxicity Assays
Mahnaz Heidari1, Mahmmoud Ghazi-Khansari, Jalal Khoshnoodi
1Department of Immunology, School of Public Health, and Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, and Avesina Research Center, Tehran, Iran.
Abstract:
T-2 toxin is a secondary fungal metabolite produced by various species of fusarium. In this study, the in vitro cytotoxicity of T-2 toxin in the human hepatoma cell line (HepG2) was determined using three methods, including neutral red dye adsorption, trypan blue dye exclusion, and uptake of radiolabeled 3 H-thymidine. The 50% lethal concentration of T-2 toxin was found to be similar for all three, accounting for 2.39, 2.96, and 3.44 ng/mL, respectively, as determined by these assays. Significant correlations were also observed among the three methods (p <. 05 through p <. 005). These results suggest that all three methods are reliable and are comparable for determining the 50% lethal concentration of T-2 toxin. It is concluded that the neutral red cytotoxicity assay may be preferable to other methods because of its simplicity, its use of nonradioactive materials, and its objectivity.
Insights
T-2 toxin, a fungal metabolite, showed similar in vitro cytotoxicity in HepG2 cells across three assays. The neutral red assay is recommended for its simplicity and non-radioactive nature.
Area of Science:
- Toxicology
- Mycology
- Cell Biology
Background:
- T-2 toxin is a harmful secondary metabolite from Fusarium fungi.
- Hepatocellular carcinoma (HCC) cell lines are vital for studying liver toxicity.
Purpose of the Study:
- To evaluate the in vitro cytotoxicity of T-2 toxin on human hepatoma cells (HepG2).
- To compare the reliability of three distinct cytotoxicity assays for T-2 toxin determination.
Main Methods:
- Neutral red dye adsorption assay.
- Trypan blue dye exclusion assay.
- Uptake of radiolabeled 3H-thymidine assay.
- All assays were performed on the human hepatoma cell line (HepG2).
Main Results:
- The 50% lethal concentration (LC50) of T-2 toxin was comparable across all three methods (2.39-3.44 ng/mL).
- Significant correlations (p < .05 to p < .005) were found between the assay results.
- All tested methods demonstrated reliability in quantifying T-2 toxin's cytotoxic effects.
Conclusions:
- The neutral red cytotoxicity assay is a reliable and comparable method for determining T-2 toxin's LC50.
- The neutral red assay is preferred due to its simplicity, non-radioactive nature, and objectivity.
