Impacts of the Staphylococcal Enterotoxin H on the Apoptosis and lncRNAs in PC3 and ACHN

Area of Science:

• Oncology
• Microbiology
• Molecular Biology

Background:

• Cancer remains a leading cause of mortality, with ongoing challenges in effective prevention and treatment.
• Bacterial toxins offer a potential avenue for cancer therapy by inducing cancer cell death via apoptosis.
• Investigating novel therapeutic strategies is crucial for combating this disease.

Purpose of the Study:

• To explore the therapeutic potential of the bacterial SEH toxin from Staphylococcus aureus.
• To evaluate the toxin's effect on apoptosis and long non-coding RNA (lncRNA) expression in cancer cell lines.
• To assess the safety and efficacy of the toxin in normal human cells.

Main Methods:

• Transfection of PC3, ACHN (cancer), and HDF (normal) cell lines with pCDNA3.1(+)-seh plasmid or an empty plasmid.
• Quantification of apoptosis levels using flow cytometry.
• Analysis of lncRNA expression (GAS5, PCA3, NEAT1, PVT1, MALAT1) via qRT-PCR.
• Assessment of cell adhesion changes.

Main Results:

• SEH toxin significantly upregulated GAS5 expression in PC3 and ACHN cells.
• Downregulation of PCA3, NEAT1, PVT1, and MALAT1 was observed in PC3 and ACHN cells.
• No significant effects were noted in the normal HDF cell line.
• Increased apoptosis rates were detected in PC3 and ACHN cells treated with SEH toxin.
• Cell adhesion was significantly downregulated.

Conclusions:

• The SEH toxin from S. aureus effectively induces apoptosis in specific cancer cell lines (PC3, ACHN) while sparing normal cells.
• The toxin modulates the expression of key lncRNAs, suggesting a role in cancer progression.
• SEH toxin shows promise as a candidate for future cancer vaccine development and therapeutic research.