Paracrine signaling in cancer-associated fibroblasts: central regulators of the tumor immune microenvironment

Area of Science:

• Oncology
• Immunology
• Cancer Biology

Background:

• The tumor microenvironment (TME) significantly impacts cancer immunotherapy efficacy.
• Cancer-associated fibroblasts (CAFs) are key stromal cells within the TME, promoting immune evasion and drug resistance.
• CAFs establish physical barriers and secrete paracrine factors that suppress anti-tumor immunity.

Purpose of the Study:

• To review the role of CAFs and their paracrine signaling in regulating the immunosuppressive TME.
• To highlight CAF-mediated immunosuppression as a critical factor limiting immunotherapy response.
• To explore emerging therapeutic strategies targeting CAF paracrine signaling for enhanced immunotherapy.

Main Methods:

• Literature review of studies on CAFs, TME, and cancer immunotherapy.
• Analysis of CAF-mediated mechanisms including physical barriers and paracrine signaling.
• Examination of natural compounds like curcumin and baicalein in modulating CAF phenotype.

Main Results:

• CAFs orchestrate TME reprogramming by recruiting immunosuppressive cells and remodeling the extracellular matrix.
• CAF paracrine signaling creates an immune-desert phenotype, hindering cytotoxic T cell infiltration.
• Targeting CAF-TME paracrine networks shows promise in clinical studies for improving immunotherapy response.

Conclusions:

• CAFs are central regulators of TME immunosuppression and immunotherapy resistance.
• Modulating CAF paracrine signaling offers a promising strategy to overcome treatment limitations.
• Natural compounds present novel therapeutic avenues for restoring anti-tumor immunity by targeting CAFs.