A cancer gene therapy approach through translational control of a suicide gene

Area of Science:

• Oncology
• Molecular Biology
• Gene Therapy

Background:

• Elevated translation initiation factor eIF4E in solid tumors promotes the translation of normally repressed mRNAs.
• This aberrant translation contributes to tumor growth and progression.

Purpose of the Study:

• To evaluate the efficacy and toxicity of a novel translational repressor element (BK-UTK) for cancer therapy.
• To compare BK-UTK with a control vector (BK-TK) in a murine breast cancer model.

Main Methods:

• Introduction of a translational repressor element into a vector (BK-UTK) expressing herpes thymidine kinase (HTK).
• Treatment of experimental murine breast cancer tumors and lung metastases with BK-UTK and a control vector (BK-TK).
• Administration of ganciclovir to activate the therapeutic payload.

Main Results:

• Both BK-UTK and BK-TK vectors demonstrated equal efficacy in reducing subcutaneous tumors and lung metastases post-ganciclovir administration.
• The BK-TK vector exhibited significant toxicity, including severe weight loss, organ degeneration, and premature death.
• The BK-UTK vector showed no toxicity and increased mean survival in the treated mice.

Conclusions:

• The BK-UTK vector, incorporating a translational repressor element, offers a safer and effective therapeutic strategy for breast cancer.
• Targeting mRNA translation via translational repressors presents a promising avenue for cancer treatment with reduced systemic toxicity.