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Servatius RJ, Marx CE, Sinha S, et al. Brain and Serum Androsterone Is Elevated in Response to Stress in Rats with Mild Traumatic Brain Injury. Front Neurosci. 2016;10:379doi: 10.3389/fnins.2016.00379.
Servatius, R. J., Marx, C. E., Sinha, S., Avcu, P., Kilts, J. D., Naylor, J. C., & Pang, K. C. (2016). Brain and Serum Androsterone Is Elevated in Response to Stress in Rats with Mild Traumatic Brain Injury. Frontiers in neuroscience, 10379. https://doi.org/10.3389/fnins.2016.00379
Servatius, Richard J, et al. "Brain and Serum Androsterone Is Elevated in Response to Stress in Rats with Mild Traumatic Brain Injury." Frontiers in neuroscience vol. 10 (2016): 379. doi: https://doi.org/10.3389/fnins.2016.00379
Servatius RJ, Marx CE, Sinha S, Avcu P, Kilts JD, Naylor JC, Pang KC. Brain and Serum Androsterone Is Elevated in Response to Stress in Rats with Mild Traumatic Brain Injury. Front Neurosci. 2016 Aug 26;10:379. doi: 10.3389/fnins.2016.00379. eCollection 2016. PMID: 27616978; PMCID: PMC4999428.
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Front Neurosci. 2016 Aug 26;10:379. doi: 10.3389/fnins.2016.00379. eCollection 2016.

Brain and Serum Androsterone Is Elevated in Response to Stress in Rats with Mild Traumatic Brain Injury.

Frontiers in neuroscience

Richard J Servatius, Christine E Marx, Swamini Sinha, Pelin Avcu, Jason D Kilts, Jennifer C Naylor, Kevin C H Pang

Affiliations

  1. Department of Veterans Affairs, Syracuse Veterans Affairs Medical CenterSyracuse, NY, USA; Rutgers Biomedical Health Sciences, Stress and Motivated Behavior Institute, Rutgers UniversityNewark, NJ, USA; Graduate School of Biomedical Sciences, Rutgers UniversityNewark, NJ, USA.
  2. Veterans Affairs Mid-Atlantic Mental Illness, Research Education and Clinical Center, Durham Veterans Affairs Medical CenterDurham, NC, USA; Department of Psychiatry and Behavioral Sciences, Duke University School of MedicineDurham, NC, USA.
  3. Rutgers Biomedical Health Sciences, Stress and Motivated Behavior Institute, Rutgers UniversityNewark, NJ, USA; Graduate School of Biomedical Sciences, Rutgers UniversityNewark, NJ, USA.
  4. Rutgers Biomedical Health Sciences, Stress and Motivated Behavior Institute, Rutgers UniversityNewark, NJ, USA; Graduate School of Biomedical Sciences, Rutgers UniversityNewark, NJ, USA; Department of Veterans Affairs, New Jersey Health Care SystemEast Orange, NJ, USA.

PMID: 27616978 PMCID: PMC4999428 DOI: 10.3389/fnins.2016.00379

Abstract

Exposure to lateral fluid percussion (LFP) injury consistent with mild traumatic brain injury (mTBI) persistently attenuates acoustic startle responses (ASRs) in rats. Here, we examined whether the experience of head trauma affects stress reactivity. Male Sprague-Dawley rats were matched for ASRs and randomly assigned to receive mTBI through LFP or experience a sham surgery (SHAM). ASRs were measured post injury days (PIDs) 1, 3, 7, 14, 21, and 28. To assess neurosteroids, rats received a single 2.0 mA, 0.5 s foot shock on PID 34 (S34), PID 35 (S35), on both days (2S), or the experimental context (CON). Levels of the neurosteroids pregnenolone (PREG), allopregnanolone (ALLO), and androsterone (ANDRO) were determined for the prefrontal cortex, hippocampus, and cerebellum. For 2S rats, repeated blood samples were obtained at 15, 30, and 60 min post-stressor for determination of corticosterone (CORT) levels after stress or context on PID 34. Similar to earlier work, ASRs were severely attenuated in mTBI rats without remission for 28 days after injury. No differences were observed between mTBI and SHAM rats in basal CORT, peak CORT levels or its recovery. In serum and brain, ANDRO levels were the most stress-sensitive. Stress-induced ANDRO elevations were greater than those in mTBI rats. As a positive allosteric modulator of gamma-aminobutyric acid (GABAA) receptors, increased brain ANDRO levels are expected to be anxiolytic. The impact of brain ANDRO elevations in the aftermath of mTBI on coping warrants further elaboration.

Keywords: Sprague-Dawley; acoustic startle response; allopregnanolone; concussions; corticosterone; footshock; lateral fluid percussion; pregnenolone

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