Genes up- and down-regulated by dermcidin in breast cancer: a microarray analysis

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Dermcidin (DCD) is a human gene located on chromosome 12q13, frequently co-amplified with oncogenes in breast cancers.
• DCD plays a significant role in the growth, survival, and progression of breast tumors.

Purpose of the Study:

• To identify genes differentially expressed in response to DCD knockdown in human breast cancer cells.
• To elucidate the molecular pathways regulated by DCD in breast cancer.

Main Methods:

• DNA microarray analysis was performed on MDA-361 cells with DCD short hairpin RNA (shRNA) expression compared to a control.
• Differential gene expression analysis identified genes with > 3-fold change and p < 0.005.

Main Results:

• DCD knockdown resulted in differential expression of 235 genes; 208 were downregulated and 27 were upregulated.
• Downregulated genes included those involved in amino acid and glucose metabolism, oxidoreductase activity, cell survival, and DNA repair.
• Upregulated genes included calcium-calmodulin-dependent protein kinase-II delta and calcineurin A alpha.
• Gene expression patterns aligned with pathways affected by PI3K/AKT/mTOR inhibitors, suggesting DCD activates this signaling cascade.
• EGFR/ErbB-1 and its ligands (betacellulin, amphiregulin) were among the downregulated genes.

Conclusions:

• Dermcidin (DCD) influences breast cancer cell metabolism, proliferation, and survival.
• DCD likely exerts its oncogenic functions through the activation of the PI3K/AKT/mTOR signaling pathway.
• Targeting DCD may represent a novel therapeutic strategy for breast cancer.