Rho GTPase-activating protein 25 (ARHGAP25)

Rho GTPase-activating protein 25 (ARHGAP25) is an enzyme that inactivates Rac1 and other Rho-type GTPases by stimulating their GTP hydrolysis, thereby regulating actin cytoskeleton remodeling, cell migration, immune responses, and cancer cell behavior. Highly expressed in hematopoietic cells, ARHGAP25 is pivotal for immune cell migration, B cell development, and controls phagocytosis. In cancers—especially colorectal, pancreatic, and osteosarcoma—loss or methylation-induced silencing of ARHGAP25 correlates with increased tumor proliferation, invasion, and poor patient prognosis; conversely, induced expression suppresses tumor growth and triggers apoptosis. Mutations can result in abnormal Rac1 signaling, leading to skeletal fragility. ARHGAP25 DNA methylation is also a potential biomarker in several disease contexts, including cancer and non-invasive prenatal diagnostics.

Other names

ARHGAP25KIAA0053HEL-S-308KAIA0053Epididymis secretory protein Li 308Epididymis secretory sperm binding protein

Epigenetic reactivation: DNA methyltransferase inhibitors like decitabine demethylate the ARHGAP25 promoter, restoring its expression and promoting apoptosis in cancer cells. Indirect targeting via modulation of upstream signaling (e.g., manipulation of AKT/mTOR, Rac1/PAK1 pathways).