Related Experiment Video
Updated: Jun 4, 2026
Production and Testing of Antimicrobial Peptides and Their Mimics
Published on: April 10, 2026
In vitro toxicity of melamine against Tetrahymena pyriformis cells
Zhengfang Wang1, Liben Chen, Rashad Al-Kasir
1College of Veterinary Medicine, China Agricultural University, Beijing 100193, China.
Abstract:
This study assessed the toxicity of melamine against the unicellular eukaryotic system of Tetrahymena (T.) pyriformis exposed to 0, 0.05, 0.25, 0.5, 2.5, and 5 mg/mL of melamine. Cell growth curves of different cultures, the half maximum inhibition concentration (IC(50)) value of melamine, and morphological changes in cells were obtained via optical and transmission electron microscopic observation. The effects of eleven melamine concentrations, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 and 5 mg/mL, on protein expression levels of T. pyriformis were examined using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The results showed an obvious inhibitory effect of melamine on the growth of eukaryotic cells. Cell growth dynamics indicated that the IC(50) value of melamine on T. pyriformis was 0.82 mg/mL. The cellular morphology was also affected in a concentration-dependent manner, with characteristics of atrophy or cell damage developing in the presence of melamine. The relative contents of the top four main proteins corresponding to peak mass-to-charge ratios (m/z) of 4466, m/z 6455, m/z 6514, and m/z 7772 in the MALDI-TOF-MS spectra were all found to be closely correlated with the melamine concentrations. In conclusion, exposure of eukaryotic cells to melamine could inhibit cell growth, cause changes in cytomorphology and even disturb the expression of proteins in a concentration-dependent manner. The described method of examining four sensitive proteins affected by melamine was also proposed to be used in a preliminary study to identify protein biomarkers in T. pyriformis.
Insights
Melamine exposure inhibits eukaryotic cell growth and alters cell structure in Tetrahymena pyriformis. Protein expression levels also change in a dose-dependent manner, suggesting potential biomarkers for toxicity.
Area of Science:
- Ecotoxicology
- Cell Biology
- Proteomics
Background:
- Melamine is a nitrogen-rich industrial chemical with known toxicity concerns.
- Understanding its impact on eukaryotic model organisms is crucial for risk assessment.
- Tetrahymena pyriformis offers a robust unicellular eukaryotic system for toxicological studies.
Purpose of the Study:
- To evaluate the toxic effects of melamine on the unicellular eukaryote Tetrahymena pyriformis.
- To determine the half-maximum inhibition concentration (IC50) of melamine for T. pyriformis.
- To investigate melamine-induced changes in cell morphology and protein expression.
Main Methods:
- Exposing T. pyriformis cultures to various melamine concentrations (0-5 mg/mL).
- Monitoring cell growth using growth curves and optical microscopy.
- Analyzing cellular morphology via transmission electron microscopy.
- Quantifying protein expression changes using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS).
Main Results:
- Melamine demonstrated a significant inhibitory effect on T. pyriformis cell growth.
- The IC50 value for melamine toxicity was determined to be 0.82 mg/mL.
- Concentration-dependent alterations in cell morphology, including atrophy and damage, were observed.
- Relative levels of four specific proteins (m/z 4466, 6455, 6514, 7772) correlated with melamine concentrations.
Conclusions:
- Melamine exposure adversely affects eukaryotic cell growth, morphology, and protein expression in a concentration-dependent manner.
- The study highlights the potential of T. pyriformis as a model for assessing melamine toxicity.
- Specific protein expression changes may serve as preliminary biomarkers for melamine exposure in T. pyriformis.
