title: Temporal dynamic changes of connexin 43 expression in C6 cells following lipopolysaccharide stimulation.
abstract: Connexin 43, a gap junction protein, is expressed mainly in glia in the central nervous system. Neuroinflammation plays an important role in central nervous system injury. Changes to glial connexin 43 levels and neuroinflammation may trigger brain injury and neurodegenerative diseases. To illustrate the relationship between connexin 43 and neuroinflammation, this study investigated how connexin 43 expression levels change in lipopolysaccharide-stimulated rat C6 glioma cells. C6 cells were treated with 0.05, 0.25, 0.5, 1, 2.5 and 5 μg/mL lipopolysaccharide for 24 hours. The nitrite estimation-detected nitric oxide release level was elevated substantially after lipopolysaccharide stimulation. To test the transcriptional level changes of inducible nitric oxide synthase, tumor necrosis factor-α and connexin 43 mRNA, C6 cells were treated with 5 μg/mL lipopolysaccharide for 3-48 hours. Reverse transcription-PCR showed that the expression of inducible nitric oxide synthase and tumor necrosis factor-α mRNA increased over time, but connexin 43 mRNA levels increased in lipopolysaccharide-stimulated C6 cells at 3 and 6 hours, and then decreased from 12 to 48 hours. Connexin 43 protein expression was detected by immunofluorescence staining, and the protein levels matched the mRNA expression levels. These results suggest that connexin 43 expression is biphasic in lipopolysaccharide-induced neuroinflammation in C6 cells, which may be correlated with the connexin 43 compensatory mechanism.
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Zhenping
authors.initials: Z
authors.lastname: Gao
authors.affiliation: Department of Pharmaceutical Engineering, College of Life Sciences, Jilin Agricultural University, Changchun 130118, Jilin Province, China.
authors.forename: Linbo
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Lue
authors.initials: L
authors.lastname: Su
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Guojun
authors.initials: G
authors.lastname: Dong
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Yu
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Jiayi
authors.initials: J
authors.lastname: Tian
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Human Anatomy, Norman Bethune College of Medicine, Jilin University, Changchun 130021, Jilin Province, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Liu
keywords: C6 cells; central nervous system; connexin; inducible nitric oxide synthase; lipopolysaccharide; neural regeneration; neuroinflammation; tumor necrosis factor-α