Document Detail

Control of proliferation and survival of C6 glioma cells with modification of the nerve growth factor autocrine system.
MedLine Citation:
PMID:  10222432     Owner:  NLM     Status:  MEDLINE    
Nerve growth factor (NGF) plays an important physiological role in differentiation and survival of various types of neurons. Glial cells and glial tumor cells synthesize multiple neurotrophic factors including NGF and secrete them into the surrounding environment; however, the mechanisms of NGF and the significance of NGF receptors have not been studied in detail. The C6 glioma cell line can synthesize NGF, respond to exogenous application of NGF and stimulate the expression of NGF receptor in an autocrine manner. In order to determine the significance of such an NGF autocrine system, the effects of exposure to exogenous NGF and deprivation of endogenous NGF were examined in a C6 glioma cell line in vitro. Exogenous NGF significantly inhibited maintenance of the cell number and thymidine incorporation. Morphological changes, including the formation of growth cones, outgrowth of processes and cellular hypertrophy, were observed, concurrently, indicating that exogenous NGF stimulated differentiation and thereby inhibited proliferation of the cells. Deprivation of endogenous NGF with anti-NGF antibody elicited a rapid decrease in cell number and thymidine incorporation, and led almost all of the cells to death within 8 days. The protein synthesis inhibitor, cycloheximide, strongly inhibited the death of NGF-deprived cells, suggesting the involvement of an active process requiring synthesis of suicide proteins. These findings imply that the NGF autocrine system plays a significant role in regulating the differentiation and survival of C6 glioma cells, similarly to neuronal cells.
T Watanabe; Y Katayama; S Kimura; A Yoshino
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of neuro-oncology     Volume:  41     ISSN:  0167-594X     ISO Abbreviation:  J. Neurooncol.     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-06-17     Completed Date:  1999-06-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8309335     Medline TA:  J Neurooncol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  121-8     Citation Subset:  IM    
Department of Neurological Surgery, Nihon University School of Medicine, Tokyo, Japan.
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MeSH Terms
Autocrine Communication / physiology*
Cell Count / drug effects
Cell Division / drug effects,  physiology
Cell Survival / drug effects,  physiology
Cycloheximide / pharmacology
Glioma / metabolism*,  pathology*
Nerve Growth Factors / deficiency,  pharmacology,  physiology*
Protein Synthesis Inhibitors / pharmacology
Thymidine / metabolism
Tumor Cells, Cultured / drug effects
Reg. No./Substance:
0/Nerve Growth Factors; 0/Protein Synthesis Inhibitors; 50-89-5/Thymidine; 66-81-9/Cycloheximide

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