Document Detail

Branched-chain alpha-keto acids accumulating in maple syrup urine disease induce reorganization of phosphorylated GFAP in C6-glioma cells.
MedLine Citation:
PMID:  16167198     Owner:  NLM     Status:  MEDLINE    
In this study we investigate the effects of the branched-chain keto acids (BCKA) alpha-ketoisocaproic (KIC), alpha-ketoisovaleric (KIV), and alpha-keto-beta-methylvaleric (KMV) acids, metabolites accumulating in maple syrup urine disease (MSUD), on the in vitro phosphorylation of glial fibrillary acidic protein (GFAP) and cytoskeletal reorganization in C6-glioma cells. We observed that after 3 h treatment with KIC, KIV, or KMV cells showed retracted cytoplasm with bipolar processes containing packed GFAP filaments as revealed by immunocytochemistry. Western Blot analysis by anti-GFAP monoclonal antibody demonstrated that BCKA were not able to alter GFAP immunocontent in total cell homogenate, but the immunocontent as well as the in vitro (32)P incorporation into GFAP recovered into the high salt Triton-insoluble cytoskeletal fraction were significantly increased. Western Blot using monoclonal antiphosphoserine antibody showed that BCKA induced increased immunocontent of phosphoserine-containing amino acids in several proteins in total cell homogenate. In addition, the immunocontent of phosphoserine-containing amino acids was also greatly increased in GFAP recovered in the high-salt Triton insoluble cytoskeletal fraction, corresponding to the polymerized intermedite filament (IF) proteins present in the cell. In conclusion, our results indicate that KIC, KIV, or KMV increased the serine/threonine in vitro phosphorylation of GFAP leading to increased Triton-insoluble GFAP immunocontent and cytoskeletal reorganization. Considering IF networks can be regulated by phosphorylation of polypeptide subunits leading to reorganization of the IF filamentous structure, we could suppose that GFAP hyperphosphorylation and disorganization of cellular structure could be involved in the brain damage characteristic of MSUD patients.
Cláudia Funchal; André Quincozes Dos Santos; Maria Caroline Jacques-Silva; Ariane Zamoner; Carmem Gottfried; Moacir Wajner; Regina Pessoa-Pureur
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Metabolic brain disease     Volume:  20     ISSN:  0885-7490     ISO Abbreviation:  Metab Brain Dis     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-16     Completed Date:  2005-11-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8610370     Medline TA:  Metab Brain Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  205-17     Citation Subset:  IM    
Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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MeSH Terms
Cell Line, Tumor
Cytoskeleton / metabolism*
Glial Fibrillary Acidic Protein / analysis,  metabolism*
Glioma / metabolism*
Keto Acids / metabolism*
Maple Syrup Urine Disease / metabolism*
Reg. No./Substance:
0/Glial Fibrillary Acidic Protein; 0/Keto Acids; 1460-34-0/alpha-keto-beta-methylvaleric acid; 759-05-7/alpha-ketoisovalerate; 816-66-0/alpha-ketoisocaproic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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