title: Reduction of protein kinase C zeta inhibits migration and invasion of human glioblastoma cells.
abstract: Glioblastomas are the most aggressive forms of primary brain tumors with their tendency to invade surrounding healthy brain tissues, rendering them largely incurable. In this report, we used small-interference RNA technology to knock down the expression of protein kinase C (PKC) zeta, which resulted in specific and massive impairment of glioblastoma cell migration and invasion. We also explained the fundamental molecular processes of glioblastoma migration and invasion in which PKCzeta is a participant. The silence of PKCzeta expression likewise impaired the phosphorylation of LIN-11, Isl1 and MEC-3 protein domain kinase (LIMK) and cofilin, which is a critical step in cofilin recycling and actin polymerization. Consistent with the defects in cell adhesion, phosphorylation of integrin beta1 was also dampened. Therefore, PKCzeta regulated both cytoskeleton rearrangement and cell adhesion, which contributed to cell migration. Additionally, there was down-regulation of matrix metalloprotease-9 expression in siPKCzeta/LN-229 cells, which coincided with decreased invasion both in vitro and in vivo. These results indicate that PKCzeta is involved in the control of glioblastoma cell migration and invasion by regulating the cytoskeleton rearrangement, cell adhesion, and matrix metalloprotease-9 expression. Collectively, these findings suggest that PKCzeta is a potential therapeutic target for glioblastoma infiltration.
authors.affiliation: Department of Core Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Guo
authors.forename: Feng
authors.initials: F
authors.lastname: Gu
authors.forename: Wenliang
authors.initials: W
authors.lastname: Li
authors.forename: Baogang
authors.initials: B
authors.lastname: Zhang
authors.forename: Ruifang
authors.initials: R
authors.lastname: Niu
authors.forename: Li
authors.initials: L
authors.lastname: Fu
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Ma
mesh_terms: D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics / Q000502:physiology*; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology; D018390:Gene Targeting; D005909:Glioblastoma / Q000201:enzymology* / Q000473:pathology*; D006801:Humans; D009361:Neoplasm Invasiveness; D011493:Protein Kinase C / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D034741:RNA, Small Interfering / Q000235:genetics; D000099221:Protein Kinase C zeta
chemical_list: D011493:Protein Kinase C; D034741:RNA, Small Interfering; D000099221:Protein Kinase C zeta