Posttraumatic hypothermia increases doublecortin expressing neurons in the dentate gyrus after traumatic brain injury in the rat

Amade Bregy, Ryan Nixon, George Lotocki, Ofelia F. Alonso, Coleen M Atkins, Pantelis Tsoulfas, Helen Bramlett, W. Dalton Dietrich

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Previous studies have demonstrated that moderate hypothermia reduces histopathological damage and improves behavioral outcome after experimental traumatic brain injury (TBI). Further investigations have clarified the mechanisms underlying the beneficial effects of hypothermia by showing that cooling reduces multiple cell injury cascades. The purpose of this study was to determine whether hypothermia could also enhance endogenous reparative processes following TBI such as neurogenesis and the replacement of lost neurons. Male Sprague-Dawley rats underwent moderate fluid-percussion brain injury and then were randomized into normothermia (37 °C) or hypothermia (33 °C) treatment. Animals received injections of 5-bromo-2'-deoxyuridine (BrdU) to detect mitotic cells after brain injury. After 3 or 7. days, animals were perfusion-fixed and processed for immunocytochemistry and confocal analysis. Sections were stained for markers selective for cell proliferation (BrdU), neuroblasts and immature neurons (doublecortin), and mature neurons (NeuN) and then analyzed using non-biased stereology to quantify neurogenesis in the dentate gyrus (DG). At 7. days after TBI, both normothermic and hypothermic TBI animals demonstrated a significant increase in the number of BrdU-immunoreactive cells in the DG as compared to sham-operated controls. At 7. days post-injury, hypothermia animals had a greater number of BrdU (ipsilateral cortex) and doublecortin (ipsilateral and contralateral cortex) immunoreactive cells in the DG as compared to normothermia animals. Because adult neurogenesis following injury may be associated with enhanced functional recovery, these data demonstrate that therapeutic hypothermia sustains the increase in neurogenesis induced by TBI and this may be one of the mechanisms by which hypothermia promotes reparative strategies in the injured nervous system.

Original languageEnglish
Pages (from-to)821-828
Number of pages8
JournalExperimental Neurology
Volume233
Issue number2
DOIs
StatePublished - Feb 1 2012

Fingerprint

Dentate Gyrus
Hypothermia
Neurogenesis
Bromodeoxyuridine
Neurons
Brain Injuries
Percussion
Induced Hypothermia
Multiple Trauma
Wounds and Injuries
Nervous System
Sprague Dawley Rats
Traumatic Brain Injury
Perfusion
Immunohistochemistry
Cell Proliferation
Injections

Keywords

  • Dentate gyrus
  • Doublecortin
  • Fluid-percussion
  • Hypothermia
  • Neurogenesis
  • Traumatic brain injury

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

Cite this

Posttraumatic hypothermia increases doublecortin expressing neurons in the dentate gyrus after traumatic brain injury in the rat. / Bregy, Amade; Nixon, Ryan; Lotocki, George; Alonso, Ofelia F.; Atkins, Coleen M; Tsoulfas, Pantelis; Bramlett, Helen; Dalton Dietrich, W.

In: Experimental Neurology, Vol. 233, No. 2, 01.02.2012, p. 821-828.

Research output: Contribution to journalArticle

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