Cancer-associated fibroblasts (CAFs) are the most common cells in the tumor stroma and are essential for tumor development and metastasis. While decreasing the release and infiltration of nanomedicine through nonspecific internalization, CAFs specifically increase solid tumor pressure and interstitial fluid pressure by secreting tumor growth- and migration-promoting cytokines, which increases vascular and organ pressure caused by solid tumor pressure. Nanoparticles have good permeability and can penetrate tumor tissue to reach the lesion area, inhibiting tumor growth. Thus, CAFs are used as modifiable targets. Here, the authors review the biological functions, origins and biomarkers of CAFs and summarize strategies for modulating CAFs in nanodelivery systems. This study provides a prospective guide to modulating CAFs to enhance oncology treatment.
Keywords: ECM modulation; anticancer strategies; biological function; biomarkers; cancer-associated fibroblasts; extracellular matrix stress; immunosuppression; nano-delivery system; tumor microenvironment; tumor therapy.
Cancer-associated fibroblasts (CAFs) participate in the growth and metastasis of cancer and also suppress the penetration of antitumor drugs into the deep tumor tissue. Therefore, many researchers have sought to improve the therapeutic efficacy of nanomedicine through the regulation of CAFs. Some nanoparticles that can precisely target CAFs can slow their growth while also assisting the immune system in fighting cancer cells and releasing pressure within the tumor. These nanoparticles may pass through tumors and inhibit the growth of cancer cells. Therefore, the modulation of CAFs with nanomedicines to enhance tumor therapy is essential.