Gene expression profiling of copper-resistant Caco-2 clones.

Area of Science:

• Cell Biology
• Genomics
• Toxicology

Background:

• Caco-2 cells are heterogeneous, limiting mechanistic studies.
• Copper exposure can induce resistance in cell lines.

Purpose of the Study:

• Isolate and characterize clonal subpopulations of copper-resistant Caco-2 cells.
• Investigate gene expression changes associated with copper resistance.

Main Methods:

• Isolation of clonal subpopulations from copper-resistant Caco-2 variants.
• Assessment of copper toxicity, cross-resistance, and morphology.
• Comprehensive gene expression analysis using transcriptomics.

Main Results:

• Isolated clones exhibited homogeneity in copper toxicity response but heterogeneity in morphology and cross-resistance.
• Gene expression analysis identified differentially expressed genes in MAP Kinase, Rap1, focal adhesion, and ECM-receptor pathways.
• Upregulation of ANXA13 and GPx2 was common across all clones; specific gene expression changes were observed for inorganic (e.g., decreased AIFM2) and organic (e.g., overexpressed UPK1B) copper exposure.

Conclusions:

• Adaptive transcriptional responses in isolated clones suggest a role for identified genes in copper resistance regulation.
• This study provides insights into cellular mechanisms of adaptation to chronic copper exposure.