Rhodamine 123 as a probe of in vitro toxicity in MDCK cells

Area of Science:

• Cell Biology
• Toxicology
• Biochemistry

Background:

• Madin-Darby Canine Kidney (MDCK) cells are a widely used model for studying cellular responses.
• Mitochondrial integrity is crucial for cell viability and function.
• Assessing cellular toxicity is essential for drug development and environmental safety.

Purpose of the Study:

• To investigate the toxic effects of mercuric chloride on MDCK cells.
• To evaluate the utility of rhodamine 123 as a fluorescent probe for toxicity assessment.
• To establish a sensitive method for in vitro toxicity analysis.

Main Methods:

• MDCK cells were treated with varying concentrations of mercuric chloride.
• The mitochondrial-specific fluorescent probe rhodamine 123 was used to monitor cellular changes.
• Mitochondrial fluorescence dissipation and rhodamine release into the medium were quantified.
• Semi-automated quantification of rhodamine 123 release or retention was performed.

Main Results:

• Mercuric chloride treatment caused a dose-dependent dissipation of rhodamine 123 fluorescence from mitochondria.
• The fluorescent probe was observed to translocate from mitochondria to the cytoplasm and subsequently be released into the extracellular medium.
• Quantification of rhodamine 123 release/retention demonstrated a sensitive and measurable toxic effect.
• The proportion of cells with delocalized rhodamine fluorescence correlated with toxicity.

Conclusions:

• Mercuric chloride induces mitochondrial dysfunction and cell damage in MDCK cells.
• Rhodamine 123 is a sensitive indicator of mercuric chloride-induced cellular toxicity.
• Semi-automated quantification of rhodamine 123 provides a robust in vitro toxicity assay.