WIPF3 (also known as CR16) is a cytoskeletal regulatory protein that functions as a key modulator of actin dynamics through interactions with the N-WASP/Arp2/3 complex pathway 1. The protein directly binds both monomeric and filamentous actin and forms stable complexes with N-WASP, particularly in brain tissue where it colocalizes at growth cone filopodia in hippocampal neurons 1. WIPF3 serves as a scaffold protein that modulates ITSN (intersectin) association with actin and promotes colocalization of ITSN1 with F-actin, suggesting a role in actin cytoskeleton remodeling 2. In the male reproductive system, WIPF3 is expressed in Sertoli cells at spermatogenic cell junctions, where decreased levels are associated with idiopathic azoospermia, indicating importance in spermatogenesis 3. Recent studies identify WIPF3 as a podocyte marker in kidney glomeruli, where overexpression stabilizes N-WASP and increases cell motility, suggesting roles in maintaining podocyte foot processes 4. The protein appears to have disease relevance, being downregulated in various pathological conditions including Alzheimer's disease and atherosclerosis 5. WIPF3 represents a conserved member of the verprolin family involved in coordinating actin cytoskeleton organization across multiple tissue types.