title: Activation of phosphatidylinositol 3-kinase by brain-derived neurotrophic factor gene transfection in septo-hippocampal cultures.
abstract: Brain-derived neurotrophic factor (BDNF) has therapeutic potential for treatment of the injured central nervous system. BDNF induces both differentiation and survival of neurons by binding to trkB receptors. This interaction stimulates the intrinsic tyrosine kinase activity of trkB, initiating a signal cascade involving the phosphorylation of intracellular protein on tyrosine, serine, and threonine residues. The purpose of this investigation was to examine the effects of cationic lipid-mediated gene transfection of BDNF on phosphatidylinositol 3 (PI3)-kinase activity in primary septo-hippocampal cell cultures. Thirty-six hours after BDNF gene transfection in the primary CNS cell culture, PI3-kinase activity was significantly increased. The increased PI3-kinase activity was inhibited by wortmannin, a selective and irreversible inhibitor of PI3-kinase. In addition, wortmannin blocked neurofilament increases induced by BDNF gene transfection. This result suggests a possible role of PI3-kinase activation in neuroprotective effects produced by BDNF gene transfection.
authors.affiliation: Vivian L. Smith Center for Neurologic Research, Department of Neurosurgery, University of Texas Health Science Center at Houston, 77030, USA.
authors.forename: Y H
authors.initials: YH
authors.lastname: Qiu
authors.forename: X
authors.initials: X
authors.lastname: Zhao
authors.forename: R L
authors.initials: RL
authors.lastname: Hayes
authors.forename: J R
authors.initials: JR
authors.lastname: Perez-Polo
authors.forename: B R
authors.initials: BR
authors.lastname: Pike
authors.forename: L
authors.initials: L
authors.lastname: Huang
authors.forename: G L
authors.initials: GL
authors.lastname: Clifton
authors.forename: K
authors.initials: K
authors.lastname: Yang
mesh_terms: D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D000906:Antibodies / Q000378:metabolism; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D002412:Cations; D002478:Cells, Cultured; D002784:Cholesterol / Q000031:analogs & derivatives / Q000494:pharmacology; D018076:DNA, Complementary / Q000235:genetics; D004789:Enzyme Activation / Q000187:drug effects / Q000235:genetics; D006624:Hippocampus / Q000166:cytology / Q000201:enzymology* / Q000378:metabolism; D006801:Humans; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011233:Precipitin Tests; D051381:Rats; D017207:Rats, Sprague-Dawley; D012688:Septum Pellucidum / Q000166:cytology / Q000201:enzymology* / Q000378:metabolism; D014162:Transfection / Q000187:drug effects / Q000235:genetics*; D000077191:Wortmannin
chemical_list: D000730:Androstadienes; D000906:Antibodies; D019208:Brain-Derived Neurotrophic Factor; D002412:Cations; D002784:Cholesterol; D018076:DNA, Complementary; D019869:Phosphatidylinositol 3-Kinases; D000081082:Phosphoinositide-3 Kinase Inhibitors; D000077191:Wortmannin; C070648:3-(N-(N',N'-dimethylaminoethane)carbamoyl)cholesterol