Reactivation of nucleases with peroxidation damages induced by a menadione: ascorbate combination devastates human...

Area of Science:

• Oncology
• Cell Biology
• Biochemistry

Background:

• Prostate cancer, particularly androgen-independent forms like DU145, presents significant treatment challenges.
• Developing novel therapeutic strategies that target cancer cells selectively is crucial.

Purpose of the Study:

• To evaluate the efficacy of a prooxidant anticancer treatment using menadione bisulfite (VK3) and sodium ascorbate (VC) on human prostate cancer xenografts in mice.
• To investigate the ultrastructural changes and mechanisms of cell death induced by this combination therapy.

Main Methods:

• Human DU145 prostate cancer xenografts were established in immunodeficient mice.
• Mice received oral, intraperitoneal, or combined oral and IP administration of VK3:VC.
• Morphological damage was assessed using light, scanning, and transmission electron microscopy.

Main Results:

• The VK3:VC treatment led to significant survival benefits in mice bearing prostate cancer xenografts.
• Ultrastructural analysis revealed extensive cell damage, including nuclear and organelle destruction, consistent with oxidative stress and autoschizis.
• Tumor cells underwent necrotic atrophy due to irreversible damage to key cellular components.

Conclusions:

• The prooxidant combination of VK3 and VC effectively induces cancer cell death through oxidative stress and autoschizis.
• This therapeutic approach demonstrated selectivity, causing significant damage to xenografted cancer cells without apparent harm to normal tissues.
• The findings support the potential of VK3:VC as an adjuvant therapy for prostate cancer and potentially other cancer types.