Correlating Live Cell Viability with Membrane Permeability Disruption Induced by Trivalent Chromium

Area of Science:

• Environmental Science
• Biochemistry
• Cell Biology

Background:

• Chromium(III) is an essential micronutrient involved in glucose regulation but can be toxic at higher exposures.
• Understanding chromium's cellular effects is crucial for assessing health risks associated with environmental exposure and supplements.

Purpose of the Study:

• To investigate the impact of chromium(III) exposure on T24 cell membrane permeability using scanning electrochemical microscopy (SECM).
• To correlate changes in membrane permeability with chromium(III) toxicity.

Main Methods:

• Utilized SECM with ferrocenemethanol and ferrocenecarboxylic acid as electrochemical mediators to assess membrane permeability.
• Employed 3D COMSOL finite element analysis simulations to quantify mediator permeability coefficients.
• Conducted MTT cell viability assays to evaluate chromium(III) toxicity.

Main Results:

• SECM revealed concentration-dependent changes in T24 cell membrane permeability upon chromium(III) exposure.
• Low chromium(III) concentrations (up to 500 μM) had minimal effect on permeability.
• Higher concentrations initially reduced FcMeOH permeability, while very high concentrations increased permeability for both mediators, mirroring cell viability trends.

Conclusions:

• Chromium(III) exposure alters T24 cell membrane permeability in a dose-dependent manner.
• SECM is a valuable tool for studying metal-induced cellular toxicity and membrane dysfunction.
• The observed changes in membrane permeability correlate with chromium(III) toxicity, providing insights into its adverse health effects.