Female gonadal hormone effects on microglial activation and functional outcomes in a mouse model of moderate traumatic brain injury.

Published online

Journal Article

AIM: To address the hypothesis that young, gonad-intact female mice have improved long-term recovery associated with decreased neuroinflammation compared to male mice. METHODS: Eight to ten week-old male, female, and ovariectomized (OVX) mice underwent closed cranial impact. Gonad-intact female mice were injured only in estrus state. After injury, between group differences were assessed using complementary immunohistochemical staining for microglial cells at 1 h, mRNA polymerase chain reaction for inflammatory markers at 1 h after injury, Rotarod over days 1-7, and water maze on days 28-31 after injury. RESULTS: Male mice had a greater area of injury (P = 0.0063), F4/80-positive cells (P = 0.032), and up regulation of inflammatory genes compared to female mice. Male and OVX mice had higher mortality after injury when compared to female mice (P = 0.043). No group differences were demonstrated in Rotarod latencies (P = 0.62). OVX mice demonstrated decreased water maze latencies compared to other groups (P = 0.049). CONCLUSION: Differences in mortality, long-term neurological recovery, and markers of neuroinflammation exist between female and male mice after moderate traumatic brain injury (MTBI). Unexpectedly, OVX mice have decreased long term neurological function after MTBI when compared to gonad intact male and female mice. As such, it can be concluded that the presence of female gonadal hormones may influence behavioural outcomes after MTBI, though mechanisms involved are unclear.

Full Text

Duke Authors

Cited Authors

  • Umeano, O; Wang, H; Dawson, H; Lei, B; Umeano, A; Kernagis, D; James, ML

Published Date

  • May 4, 2017

Published In

Volume / Issue

  • 6 / 2

Start / End Page

  • 107 - 115

PubMed ID

  • 28529912

Pubmed Central ID

  • 28529912

International Standard Serial Number (ISSN)

  • 2220-3141

Digital Object Identifier (DOI)

  • 10.5492/wjccm.v6.i2.107

Language

  • eng

Conference Location

  • United States