Sustained delivery of nicotinamide limits cortical injury and improves functional recovery following traumatic brain injury

Andrea M. Goffus, Gail D. Anderson, Michael R. Hoane

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Previously, we have demonstrated that nicotinamide (NAM), a neuroprotective soluble B-group vitamin, improves recovery of function following traumatic brain injury (TBI). However, no prior studies have examined whether NAM is beneficial following continuous infusions over 7 days post-TBI. The purpose of this study was to investigate the preclinical efficacy of NAM treatment as it might be delivered clinically; over several days by slow infusion. Rats were prepared with either unilateral controlled cortical impact (CCI) injuries or sham procedures and divided into three groups: CCI-NAM, CCI-vehicle and sham. Thirty minutes following CCI, Alzet osmotic mini-pumps were implanted subcutaneously. NAM was delivered at a rate of 50 mg/kg/day for 7 days immediately post-CCI. On day 7 following injury, the pumps were removed and blood draws were collected for serum NAM and nicotinamide adenine dinucleotide (NAD+) analyses. starting on day 2 post-CCI, animals were tested on a battery of sensorimotor tests (bilateral tactile adhesive removal, locomotor placing and limb-use asymmetry). Continuous infusion of NAM resulted in a significant serum elevation in NAM, but not NAD+. Statistical analyses of the tactile removal and locomotor placing data revealed that continuous administration of NAM significantly reduced the initial magnitude of the injury deficit and improved overall recovery compared to the vehicle-treated animals. NAM treatment also significantly decreased limb-use asymmetries compared to vehicle-treated animals. The overall extent of the cortical damage was also reduced by NAM treatment. No detrimental effects were seen following continuous infusion. The present results suggest that NAM delivered via a clinically relevant therapeutic regimen may truncate behavioral damage following TBI. Thus our results offer strong support for translation into the clinical population.

Original languageEnglish (US)
Pages (from-to)145-152
Number of pages8
JournalOxidative medicine and cellular longevity
Volume3
Issue number2
DOIs
StatePublished - Mar 1 2010
Externally publishedYes

    Fingerprint

Keywords

  • Behavior
  • Brain injury
  • Neurorehabilitation
  • Restorative neurology
  • Therapy

ASJC Scopus subject areas

  • Biochemistry
  • Aging
  • Cell Biology

Cite this