Pre-metastatic niche: formation, characteristics and therapeutic implication

Area of Science:

• Oncology
• Cell Biology
• Immunology

Background:

• Distant metastasis is a major cause of cancer mortality and poor surgical outcomes.
• Pre-metastatic niche formation is a critical early step preceding organ-specific metastasis.
• Understanding the pre-metastatic niche is key to developing effective anti-cancer therapies.

Purpose of the Study:

• To review the intricate landscape of the pre-metastatic niche.
• To elucidate the roles of cellular and molecular factors in its formation.
• To highlight therapeutic strategies targeting the pre-metastatic niche.

Main Methods:

• Comprehensive literature review on pre-metastatic niche formation.
• Analysis of tumor-derived factors, extracellular vesicles, and circulating tumor cells.
• Examination of cellular components (macrophages, neutrophils, immune cells) and molecular factors.
• Discussion of temporal mechanisms including EMT, immunosuppression, ECM remodeling, metabolic reprogramming, and angiogenesis.
• Elucidation of pre-metastatic niche characteristics in various organs (lymph nodes, lungs, liver, brain, bones).

Main Results:

• Pre-metastatic niche formation is orchestrated by tumor-derived factors, extracellular vesicles, and circulating tumor cells.
• Cellular players like macrophages, neutrophils, and immune cells significantly influence niche development.
• Molecular mechanisms such as epithelial-mesenchymal transition, immunosuppression, and angiogenesis are vital for niche establishment.
• The pre-metastatic niche exhibits distinct characteristics across different metastatic organ sites.
• Targeting cellular/molecular components and signaling pathways (TGF-β, VEGF, MET) shows therapeutic potential.

Conclusions:

• The pre-metastatic niche is a complex, dynamic microenvironment essential for cancer metastasis.
• Targeting the pre-metastatic niche offers a promising strategy to prevent or treat distant metastasis.
• Further research into pre-metastatic niche modulation can lead to novel therapeutic interventions.