J Korean Neurotraumatol Soc.  2006 Jun;2(1):1-6. 10.13004/jknts.2006.2.1.1.

Effect of Decompressive Craniectomy and Hypothermia on the Expression of c-Fos and Heat Shock Proteins Following Fluid Percussion Brain Injury in the Rat

• Han YM
• Yoo DS
• Huh PW
• Cho KS
• Kim DS

• KMID: 2192326
• DOI: http://doi.org/10.13004/jknts.2006.2.1.1

Abstract

OBJECTIVE
In order to evaluate the cellular responses to different treatment modalities following traumatic brain injury, the expression of c-Fos protein and Heat shock protein (HSP70) in rat brain tissue subjected to moderate severity of fluid-percussion injury (FPI) was measured with Western blot analysis.
METHODS
Male Sprague-Dawley (SD) rats (n=62, 200-250 g) were subjected to sham surgery alone (n=10) or to lateral fluid percussion brain injury of moderate severity (n=52, 2.1-2.5 atm). Parasagittal FPI induced the expression of c-Fos and HSP70 proteins in the hemisphere ipsilateral to the injury. Injured rats were treated with hypothermia (n=20) or decompressive craniectomy (n=20). Ten rats in each group were sacrificed 24h or 72h following FPI. The brain specimens were collected at 24, or 72 hours after injury and prepared for Western blot analysis.
RESULTS
Expression of c-Fos protein and HSP70 following FPI showed a increased pattern at 24 hours post-injury and maintained till 72 hours post-injury. The expression of c-Fos and HSP70 was significantly reduced in rats treated with either moderate hypothermia or decompressive craniectomy at 24 and 72 hours post-injury, compared with those without treatments. The expression patterns of c-Fos and HSP70 were not same, however, theses differences were not statistically significant.
CONCLUSION
These results suggest that treatment of traumatic brain injury with either decompressive craniectomy or hypothermia may similarly influence the cellular defense mechanism involving the expression of IEGs and HSP70.

Keyword

Traumatic brain injury; Immediate early gene; c-fos, Heat shock protein; Hypothermia; Craniectomy

MeSH Terms

Animals
Blotting, Western
Brain Injuries*
Brain*
Decompressive Craniectomy*
Heat-Shock Proteins*
Hot Temperature*
Humans
Hypothermia*
Male
Percussion*
Rats*
Rats, Sprague-Dawley
Heat-Shock Proteins