Distinguishing the Unique Neuropathological Profile of Blast Polytrauma

Oxid Med Cell Longev. 2017:2017:5175249. doi: 10.1155/2017/5175249. Epub 2017 Mar 23.

Abstract

Traumatic brain injury sustained after blast exposure (blast-induced TBI) has recently been documented as a growing issue for military personnel. Incidence of injury to organs such as the lungs has decreased, though current epidemiology still causes a great public health burden. In addition, unprotected civilians sustain primary blast lung injury (PBLI) at alarming rates. Often, mild-to-moderate cases of PBLI are survivable with medical intervention, which creates a growing population of survivors of blast-induced polytrauma (BPT) with symptoms from blast-induced mild TBI (mTBI). Currently, there is a lack of preclinical models simulating BPT, which is crucial to identifying unique injury mechanisms of BPT and its management. To meet this need, our group characterized a rodent model of BPT and compared results to a blast-induced mTBI model. Open field (OF) performance trials were performed on rodents at 7 days after injury. Immunohistochemistry was performed to evaluate cellular outcome at day seven following BPT. Levels of reactive astrocytes (GFAP), apoptosis (cleaved caspase-3 expression), and vascular damage (SMI-71) were significantly elevated in BPT compared to blast-induced mTBI. Downstream markers of hypoxia (HIF-1α and VEGF) were higher only after BPT. This study highlights the need for unique therapeutics and prehospital management when handling BPT.

MeSH terms

  • Animals
  • Apoptosis
  • Astrocytes / cytology
  • Astrocytes / metabolism
  • Blood-Brain Barrier / metabolism
  • Calcium-Binding Proteins / metabolism
  • Caspase 3 / metabolism
  • Disease Models, Animal
  • Glial Fibrillary Acidic Protein
  • Hypoxia-Inducible Factor 1, alpha Subunit / metabolism
  • Immunohistochemistry
  • Lung Injury / metabolism
  • Lung Injury / pathology
  • Male
  • Microfilament Proteins / metabolism
  • Microglia / cytology
  • Microglia / metabolism
  • Multiple Trauma / metabolism
  • Multiple Trauma / pathology*
  • Rats
  • Rats, Sprague-Dawley
  • Vascular Endothelial Growth Factor A

Substances

  • Aif1 protein, rat
  • Calcium-Binding Proteins
  • Glial Fibrillary Acidic Protein
  • Hypoxia-Inducible Factor 1, alpha Subunit
  • Microfilament Proteins
  • Vascular Endothelial Growth Factor A
  • Caspase 3