Chemical alternative for cell identification and cross-contamination detection

Area of Science:

• Cell Biology
• Biochemistry
• Pharmacology

Background:

• Cell line misidentification compromises experimental validity in cell culture.
• Existing cell-line authentication methods (enzymatic, molecular) are often expensive.
• There is a need for accessible and affordable cell-line authentication techniques.

Purpose of the Study:

• To develop a simple, cost-effective chemical assay for human cell line authentication.
• To evaluate the differential cytotoxicity of tamoxifen derivatives and cisplatin across breast cancer cell lines.
• To investigate cell cycle, caspase-3 activity, and proliferation differences induced by specific cytotoxic compounds.

Main Methods:

• Cytotoxicity assays using cisplatin and eight tamoxifen derivatives on MCF-7, T47D, and MDA-MB-231 cell lines.
• Determination of half maximal inhibitory concentration (IC50) values for each compound and cell line.
• Flow cytometry analysis of cell cycle distribution.
• Measurement of caspase-3 activity and cell proliferation.

Main Results:

• Four out of eight tamoxifen derivatives exhibited cell type-dependent IC50 values, enabling differentiation.
• The compound P15 showed similar IC50 values across cell lines but induced distinct cell cycle arrest (SubG1 for T47D, S phase for MDA-MB-231).
• Significant differences in caspase-3 activity and proliferation were observed in P15-treated cells.

Conclusions:

• Tamoxifen derivatives offer a viable, economical alternative for cell line authentication.
• Differential cytotoxic responses and cell cycle perturbations provide markers for distinguishing breast cancer cell lines.
• Compound P15 highlights unique cellular responses that can be leveraged for authentication and mechanistic studies.