SNAI2 as a novel radioprotector of normal tissue by gene transfer using a lentiviral bicistronic SIN vector

Area of Science:

• Molecular Biology
• Cancer Research
• Gene Therapy

Background:

• Radiotherapy can cause p53-dependent apoptosis in radiosensitive hematopoietic stem cells.
• PUMA, a proapoptotic protein, is a transcriptional target of p53.
• Targeting PUMA expression offers a potential strategy for normal tissue protection during radiotherapy.

Purpose of the Study:

• To investigate the potential of gene therapy with the transcription repressor SNAI2 as a transgene for normal tissue protection during radiotherapy.
• To evaluate the radioprotective effect of SNAI2 overexpression in a cellular model system.

Main Methods:

• SNAI2 cDNA was cloned into a lentiviral SIN vector with EGFP as a selection gene.
• Wild-type p53 TK6 cells were used to assess the effects of SNAI2 overexpression.
• Cytotoxicity and clonogenic assays were performed after irradiation to evaluate cell survival and apoptosis.

Main Results:

• SNAI2 overexpression demonstrated a significant radioprotective effect in TK6 cells compared to control groups.
• Cells overexpressing SNAI2 showed a survival advantage after irradiation.
• Apoptosis was reduced by approximately 50% in SNAI2-overexpressing cells compared to controls.

Conclusions:

• Lentiviral overexpression of SNAI2 provides a proof of principle for radioprotective gene therapy.
• SNAI2 gene therapy may enhance the therapeutic range of radiotherapy by protecting normal tissues.