title: Tau complexes with phospholipase C-gamma in situ.
abstract: Based on the results of recent in vitro studies, tau has been proposed to be involved in regulating signal transduction through the phospholipase C-gamma (PLC-gamma) signaling pathway. The present study provides support for the physiological relevance of this hypothesis by demonstrating the existence of a tau-PLC-gamma complex in situ in a human neuroblastoma cell line. Both PLC-gamma and PLC-delta, but not PLC-beta, co-purified with microtubule-associated proteins. PLC-gamma, but neither PLC-delta nor PLC-beta, co-immunoprecipitated with tau, and the PLC co-precipitating with tau was enzymatically active. Additionally, both tau and MAP-2 co-precipitated with PLC-gamma. These studies indicate that tau associates, either directly or indirectly, with PLC-gamma in situ, suggesting that tau may be appropriately localized to participate in the regulation of signal transduction through the PLC-gamma pathway in vivo.
authors.affiliation: Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, 35294-0017, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Jenkins
authors.forename: G V
authors.initials: GV
authors.lastname: Johnson
mesh_terms: D006801:Humans; D007527:Isoenzymes / Q000737:chemistry*; D009474:Neurons / Q000737:chemistry*; D051966:Phospholipase C gamma; D011233:Precipitin Tests; D015398:Signal Transduction / Q000502:physiology; D014407:Tumor Cells, Cultured; D010738:Type C Phospholipases / Q000737:chemistry*; D016875:tau Proteins / Q000737:chemistry*
chemical_list: D007527:Isoenzymes; D016875:tau Proteins; D010738:Type C Phospholipases; D051966:Phospholipase C gamma