Document Detail

The effects of inflammation on glial fibrillary acidic protein expression in satellite cells of the dorsal root ganglion.
MedLine Citation:
PMID:  19770604     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: After undergoing L5 hemilaminectomy, chromic gut suture was placed onto the DRG and the animals were sacrificed at various time-points. OBJECTIVE: The purpose of this study was to identify the effects of inflammation on satellite cells (SCs) of the dorsal root ganglion (DRG) by analyzing glial fibrillary acidic protein (GFAP) expression in of the DRG at various time points. SUMMARY OF BACKGROUND DATA: SCs are neuroglial cells that closely interact with nerve cells of the DRG. The role of SC remains unknown GFAP expression increases in response to CNS injury. Loss of GFAP has impaired Schwann cell proliferation and delayed nerve regeneration after injury. METHODS: Sixty rats underwent a left L5 hemilaminectomy. In Group I, a chromic-gut suture was place topically on the DRG (n = 30), Group II was the sham surgery group (n = 30). DRGs were harvested at 6, 24, 48, 72 hours, and 7 days after surgery. In Group III, 6 control rats were killed and their bilateral L5 DRG harvested. The harvested DRG were analyzed using light microscopy for SC immunoreactivity, using GFAP, HIS-36, TNF-alpha, IL-1alpha, IL-1beta, IL-6 monoclonal antibodies. RESULTS: One hundred thirty-two DRGs were harvested for analysis. Na??ve controls and neurons did not express GFAP. The SC sheath expressed GFAP as early as 6 hours postchromic gut application. In Group I, GFAP expression steadily increased after chromic-gut application with 100% of SC soma and SC sheaths being GFAP positive at 7 days. The contralateral DRG demonstrated delayed GFAP expression, with 83% of SC soma and SC sheaths were GFAP positive at 7 days. In Group II, 89% of sacs expressed GFAP by 7 compared to 79% in the contralateral undisturbed DRG. CONCLUSION: Under physiologic conditions, the expression of GFAP by SCs is undetectable. As the inflammatory process develops, GFAP expression steadily increases with 100% of SCs being GFAP immunoreactive 7 days after chromic gut application. These data suggest that SCs are the primary source of GFAP in the DRG. We hypothesize that SC play an important role in the response to early inflammatory injury.
Krzysztof Siemionow; Aleksandra Klimczak; Grzegorz Brzezicki; Maria Siemionow; Robert F McLain
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Spine     Volume:  34     ISSN:  1528-1159     ISO Abbreviation:  Spine     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-09-22     Completed Date:  2010-01-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1631-7     Citation Subset:  IM    
Department of Orthopedic Surgery, Cleveland Clinic, Cleveland, OH, USA.
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MeSH Terms
Ganglia, Spinal / metabolism*
Glial Fibrillary Acidic Protein / biosynthesis*,  metabolism*
Inflammation / physiopathology*
Interleukin-1beta / biosynthesis
Interleukin-6 / biosynthesis
Lumbar Vertebrae / surgery
Rats, Inbred Lew
Satellite Cells, Perineuronal
Time Factors
Tumor Necrosis Factor-alpha / biosynthesis
Reg. No./Substance:
0/Glial Fibrillary Acidic Protein; 0/Interleukin-1beta; 0/Interleukin-6; 0/Tumor Necrosis Factor-alpha

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