Oxidative and nitrosative stress in the metastatic microenvironment

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Metastases resistant to conventional therapies cause most cancer deaths.
• Tumor cell heterogeneity and microenvironmental factors complicate cancer therapy.
• Metastasis involves critical interactions between cancer cells and the vascular endothelium.

Purpose of the Study:

• To elucidate the molecular mechanisms underlying metastatic cell survival and therapy resistance.
• To identify key molecular targets essential for the survival of invasive metastatic cell subsets.
• To understand the role of reactive oxygen and nitrogen species (ROS and RNS) in metastasis.

Main Methods:

• Analysis of molecular events during cancer cell interaction with endothelium.
• Investigation of cellular responses to microenvironmental factors and immune attack.
• Examination of the role of ROS and RNS in metastatic cell adaptation and survival.

Main Results:

• Cancer cell-endothelial cell interactions trigger activation pathways involving cytokines, growth factors, lipids, ROS, and RNS.
• Endothelium-derived NO and H2O2 exhibit cytotoxicity but also reveal critical survival targets for metastatic cells.
• Metastatic cells undergo dynamic adaptations, influenced by immune cells and organ-specific microenvironments, leading to resistant phenotypes.

Conclusions:

• Metastatic progression and therapy resistance are driven by dynamic cellular adaptations.
• ROS and RNS are pivotal in facilitating the survival of highly resistant malignant cell subsets.
• Targeting molecular pathways involving ROS and RNS may offer new therapeutic strategies against resistant metastases.