Glutathione in metastases: From mechanisms to clinical applications

Area of Science:

• Oncology
• Cancer Metastasis
• Cellular Stress Response

Background:

• Metastatic spread is the primary cause of cancer mortality, surpassing primary tumor lethality.
• Glutathione (γ-glutamyl-cysteinyl-glycine, GSH) plays a crucial role in cancer cell proliferation, dissemination, and resistance to therapies.
• Elevated GSH levels in metastatic cells enhance survival against oxidative and nitrosative stresses encountered at the vascular endothelium.

Purpose of the Study:

• To review the intricate relationship between glutathione and key mechanisms enabling metastatic cell survival and growth.
• To explore how metastatic cells utilize adaptive stress responses, evade cell death, and leverage neuroendocrine pathways.
• To analyze therapeutic strategies focused on depleting metastatic cell GSH to enhance treatment sensitivity.

Main Methods:

• Literature review synthesizing current research on glutathione's role in cancer metastasis.
• Analysis of cellular mechanisms including stress adaptation, apoptosis evasion, and neuroendocrine signaling in metastatic contexts.
• Evaluation of therapeutic approaches targeting glutathione depletion in metastatic cancer.

Main Results:

• High GSH levels are critical for metastatic cell survival upon interaction with the vascular endothelium.
• Interorgan transport of GSH, primarily from the liver, fuels the growth of metastatic foci.
• Glutathione facilitates adaptive stress responses, promotes cell death evasion, and integrates with neuroendocrine mechanisms for metastatic progression.

Conclusions:

• Glutathione is a pivotal factor in the survival and growth of metastatic cancer cells.
• Targeting GSH metabolism represents a promising strategy to overcome therapeutic resistance and improve outcomes for metastatic cancer.
• Further research into GSH-mediated mechanisms can unveil novel therapeutic targets for combating cancer metastasis.