Histone deacetylase inhibitor 4-phenylbutyrate modulates glial fibrillary acidic protein and connexin 43 expression, and enhances gap-junction communication, in human glioblastoma cells

Human glioblastoma cell cultures were established and the expression of glial fibrillary acidic protein (GFAP) and the gap-junction protein connexin 43 (Cx43) was confirmed by Western blot. Following treatment with 4-phenylbutyrate (4-PB), increased concentrations of non-phosphorylated GFAP were see...

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Bibliographic Details
Published in:European journal of cancer (1990) 2004-05, Vol.40 (7), p.1073-1081
Main Authors: Asklund, T., Appelskog, I.B., Ammerpohl, O., Ekström, T.J., Almqvist, P.M.
Format: Article
Language:English
Subjects:
Antineoplastic Agents - pharmacology
Biological and medical sciences
Blotting, Western
Cell Communication - physiology
Connexin 43
Connexin 43 - metabolism
Gap junction
Gap Junctions - metabolism
GFAP
Glial Fibrillary Acidic Protein - metabolism
Glioblastoma - metabolism
Histone Deacetylase Inhibitors
Histone Deacetylases - drug effects
Humans
Immunocytochemistry
Immunohistochemistry
Malignant glioma
Medical sciences
Medicin och hälsovetenskap
Neurology
Pharmacology. Drug treatments
Phenylbutyrates - pharmacology
Phosphorylation
Primary culture
Tumor Cells, Cultured
Tumors
Tumors of the nervous system. Phacomatoses
Western blot
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Summary:Human glioblastoma cell cultures were established and the expression of glial fibrillary acidic protein (GFAP) and the gap-junction protein connexin 43 (Cx43) was confirmed by Western blot. Following treatment with 4-phenylbutyrate (4-PB), increased concentrations of non-phosphorylated GFAP were seen, while phosphorylated isoforms remained intact. Immunocytochemical staining of glioblastoma cells revealed an intracellular redistribution of GFAP. In addition to cytoplasmic immunostaining, GFAP immunoreactivity was also associated with the nucleus and/or the nuclear membrane. Phosphorylated and non-phosphorylated Cx43 proteins were increased 2- to 5-fold following 4-PB treatment, and were redistributed to areas of the cell surface, participating in cell-to-cell contacts. In addition, functional gap-junction coupling was amplified, as indicated by increased fluorescent dye transfer, and elevated levels of Cx43 protein were detected in parallel with enhanced gap-junction communication. Induced cell differentiation, with improved functional coupling of tumour cells, may be of importance for therapeutic strategies involving intercellular transport of low molecular-weight compounds.
ISSN:0959-8049
1879-0852
DOI:10.1016/j.ejca.2003.11.034