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Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress.

Publication ,  Journal Article
Klein, RC; Acheson, SK; Qadri, LH; Dawson, AA; Rodriguiz, RM; Wetsel, WC; Moore, SD; Laskowitz, DT; Dawson, HN
Published in: J Neurosci Res
June 2016

Traumatic brain injury (TBI) is a leading cause of death and disability among young adults and is highly prevalent among recently deployed military personnel. Survivors of TBI often experience cognitive and emotional deficits, suggesting that long-term effects of injury may disrupt neuronal function in critical brain regions, including the amygdala, which is involved in emotion and fear memory. Amygdala hyperexcitability has been reported in both TBI and posttraumatic stress disorder patients, yet little is known regarding the effects of combined stress and TBI on amygdala structure and function at the neuronal level. The present study seeks to determine how the long-term effects of preinjury foot-shock stress and TBI interact to influence synaptic plasticity in the lateral amygdala (LA) of adult male C57BL/6J mice by using whole-cell patch clamp electrophysiology 2-3 months postinjury. In the absence of stress, TBI resulted in a significant increase in membrane excitability and spontaneous excitatory postsynaptic currents (sEPSCs) in LA pyramidal-like neurons. Foot-shock stress in the absence of TBI also resulted in increased sEPSC activity. In contrast, when preinjury stress and TBI occurred in combination, sEPSC activity was significantly decreased compared with either condition alone. There were no significant differences in inhibitory activity or total dendritic length among any of the treatment groups. These results demonstrate that stress and TBI may be contributing to amygdala hyperexcitability via different mechanisms and that these pathways may counterbalance each other with respect to long-term pathophysiology in the LA.

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Published In

J Neurosci Res

DOI

EISSN

1097-4547

Publication Date

June 2016

Volume

94

Issue

6

Start / End Page

579 / 589

Location

United States

Related Subject Headings

  • Stress, Psychological
  • Patch-Clamp Techniques
  • Neurons
  • Neurology & Neurosurgery
  • Mice, Inbred C57BL
  • Mice
  • Male
  • Excitatory Postsynaptic Potentials
  • Electroshock
  • Electric Stimulation
 

Citation

APA
Chicago
ICMJE
MLA
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Klein, R. C., Acheson, S. K., Qadri, L. H., Dawson, A. A., Rodriguiz, R. M., Wetsel, W. C., … Dawson, H. N. (2016). Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress. J Neurosci Res, 94(6), 579–589. https://doi.org/10.1002/jnr.23702
Klein, Rebecca C., Shawn K. Acheson, Laura H. Qadri, Alina A. Dawson, Ramona M. Rodriguiz, William C. Wetsel, Scott D. Moore, Daniel T. Laskowitz, and Hana N. Dawson. “Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress.J Neurosci Res 94, no. 6 (June 2016): 579–89. https://doi.org/10.1002/jnr.23702.
Klein RC, Acheson SK, Qadri LH, Dawson AA, Rodriguiz RM, Wetsel WC, et al. Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress. J Neurosci Res. 2016 Jun;94(6):579–89.
Klein, Rebecca C., et al. “Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress.J Neurosci Res, vol. 94, no. 6, June 2016, pp. 579–89. Pubmed, doi:10.1002/jnr.23702.
Klein RC, Acheson SK, Qadri LH, Dawson AA, Rodriguiz RM, Wetsel WC, Moore SD, Laskowitz DT, Dawson HN. Opposing effects of traumatic brain injury on excitatory synaptic function in the lateral amygdala in the absence and presence of preinjury stress. J Neurosci Res. 2016 Jun;94(6):579–589.
Journal cover image

Published In

J Neurosci Res

DOI

EISSN

1097-4547

Publication Date

June 2016

Volume

94

Issue

6

Start / End Page

579 / 589

Location

United States

Related Subject Headings

  • Stress, Psychological
  • Patch-Clamp Techniques
  • Neurons
  • Neurology & Neurosurgery
  • Mice, Inbred C57BL
  • Mice
  • Male
  • Excitatory Postsynaptic Potentials
  • Electroshock
  • Electric Stimulation