title: Protein kinase C-zeta regulation of GLUT4 translocation through actin remodeling in CHO cells.
abstract: Actin remodeling plays a crucial role in insulin-induced translocation of glucose transporter 4 (GLUT4) from the cytoplasm to the plasma membrane and subsequent glucose transport. Protein kinase C (PKC) zeta has been implicated in this translocation process, although the exact mechanism remains unknown. In this study, we investigated the effect of PKCzeta on actin cytoskeleton and translocation of GLUT4 in CHO-K1 cells expressing myc-tagged GLUT4. Insulin stimulated the phosphorylation of PKCzeta at Thr410 with no apparent effect on its protein expression. Moreover, insulin promoted colocalization of PKCzeta and actin that could be abolished by Latrunculin B. The overexpression of PKCzeta mimicked the insulin-induced change in actin cytoskeleton and translocation of GLUT4. These effects were also completely abrogated by Latrunculin B treatment. Using cell-permeable pseudosubstrate (PS) inhibitor of PKCzeta, the response to insulin could be alleviated. Our results strongly suggest that PKCzeta mediates the stimulatory effect of insulin on GLUT4 translocation through its interaction with actin cytoskeleton.
authors.affiliation: National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & School of Basic Medicine Peking Union Medical College, Beijing, China.
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Liu
authors.forename: Chang
authors.initials: C
authors.lastname: Yang
authors.forename: Nishith
authors.initials: N
authors.lastname: Gupta
authors.forename: Jin
authors.initials: J
authors.lastname: Zuo
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Chang
authors.forename: Fu-De
authors.initials: FD
authors.lastname: Fang
mesh_terms: D000199:Actins / Q000378:metabolism*; D000818:Animals; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000494:pharmacology; D016466:CHO Cells; D002462:Cell Membrane / Q000378:metabolism; D006224:Cricetinae; D003412:Cricetulus; D003593:Cytoplasm / Q000378:metabolism; D003599:Cytoskeleton / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D005947:Glucose / Q000378:metabolism; D051275:Glucose Transporter Type 4 / Q000235:genetics / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D015151:Immunoblotting; D007328:Insulin / Q000494:pharmacology; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D010766:Phosphorylation / Q000187:drug effects; D011493:Protein Kinase C / Q000235:genetics / Q000378:metabolism*; D021381:Protein Transport / Q000187:drug effects; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D053778:Thiazolidines / Q000494:pharmacology; D013912:Threonine / Q000378:metabolism; D014162:Transfection; D000099221:Protein Kinase C zeta
chemical_list: D000199:Actins; D019086:Bridged Bicyclo Compounds, Heterocyclic; D005947:Glucose; D051275:Glucose Transporter Type 4; D049452:Green Fluorescent Proteins; D007328:Insulin; D011493:Protein Kinase C; D011993:Recombinant Fusion Proteins; D053778:Thiazolidines; D013912:Threonine; D000099221:Protein Kinase C zeta; C037068:latrunculin B