Suppression of Glial Tumor Growth by Expression of Glial Fibrillary Acidic Protein |
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Authors: | Toda Masahiro Miura Masayuki Asou Hiroaki Sugiyama Ichiro Kawase Takeshi Uyemura Keiichi |
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Institution: | (1) Keio University School of Medicine, Shinjuku-ku, Tokyo, 160-8582, Japan;(2) Departments of Neurosurgery, Keio University School of Medicine, Shinjuku, Tokyo, 160-8582, Japan;(3) Department of Neuroanatomy, Biomedical Research Center, Osaka University Medical School, Suita, Osaka, 565, Japan;(4) Department of Neuro-cell Biology, Tokyo Metropolitan Institute of Gerontology, Itabashi, Tokyo, 173, Japan |
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Abstract: | We examined the effect of expression of glial fibrillary acidic protein (GFAP) on the tumor growth of astrocytoma in vivo. When rat astrocytoma C6 cells were injected subcutaneously in athymic mice, the cells produced tumors that grew rapidly. The tumor growth of C6 cells transfected with GFAP cDNA was significantly reduced compared to that of control NeoC6 cells transfected only with the neomycin resistant gene. After implantation of C6 cells transfected with mutated GFAP cDNA at the phosphorylation sites, the tumor growth was suppressed similar to that of the wild GFAP transfectants. To determine whether the cell growth suppression by GFAP is specific for astroglial cells, we assessed the effect of GFAP on the cell growth of an L cell of fibroblast origin in vitro. By GFAP cDNA transfection, L cells showed morphological changes, but the cell growth was not reduced. These results suggest that GFAP is a critical regulator of the tumor growth of astrocytoma. |
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Keywords: | GFAP tumor suppression astrocytoma fibroblast mutation |
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