title: The F-BAR protein CIP4 inhibits neurite formation by producing lamellipodial protrusions.
abstract: Neurite formation is a seminal event in the early development of neurons. However, little is known about the mechanisms by which neurons form neurites. F-BAR proteins function in sensing and inducing membrane curvature. Cdc42-interacting protein 4 (CIP4), a member of the F-BAR family, regulates endocytosis in a variety of cell types. However, there is little data on how CIP4 functions in neurons. Here we show that CIP4 plays a novel role in neuronal development by inhibiting neurite formation. Remarkably, CIP4 exerts this effect not through endocytosis, but by producing lamellipodial protrusions. In primary cortical neurons CIP4 is concentrated specifically at the tips of extending lamellipodia and filopodia, instead of endosomes as in other cell types. Overexpression of CIP4 results in lamellipodial protrusions around the cell body, subsequently delaying neurite formation and enlarging growth cones. These effects depend on the F-BAR and SH3 domains of CIP4 and on its ability to multimerize. Conversely, cortical neurons from CIP4-null mice initiate neurites twice as fast as controls. This is the first study to demonstrate that an F-BAR protein functions differently in neuronal versus nonneuronal cells and induces lamellipodial protrusions instead of invaginations or filopodia-like structures.
authors.affiliation: Department of Neuroscience, University of Wisconsin-Madison, Madison, WI 53706, USA.
authors.forename: Witchuda
authors.initials: W
authors.lastname: Saengsawang
authors.forename: Kelly
authors.initials: K
authors.lastname: Mitok
authors.forename: Chris
authors.initials: C
authors.lastname: Viesselmann
authors.forename: Lauren
authors.initials: L
authors.lastname: Pietila
authors.forename: Derek C
authors.initials: DC
authors.lastname: Lumbard
authors.forename: Seth J
authors.initials: SJ
authors.lastname: Corey
authors.forename: Erik W
authors.initials: EW
authors.lastname: Dent
mesh_terms: D000818:Animals; D019556:COS Cells; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology / Q000196:embryology / Q000502:physiology; D002522:Chlorocebus aethiops; D004705:Endocytosis; D051379:Mice; D018345:Mice, Knockout; D008869:Microtubule-Associated Proteins / Q000737:chemistry / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D015778:Minor Histocompatibility Antigens; D016501:Neurites / Q000502:physiology* / Q000648:ultrastructure*; D055495:Neurogenesis / Q000502:physiology; D009474:Neurons / Q000502:physiology / Q000648:ultrastructure; D055503:Protein Multimerization; D011554:Pseudopodia / Q000502:physiology* / Q000648:ultrastructure*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D018909:src Homology Domains
chemical_list: D008869:Microtubule-Associated Proteins; D015778:Minor Histocompatibility Antigens; D011993:Recombinant Fusion Proteins; C485787:Trip10 protein, mouse