α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia

Chiye Aoki, G. Wable, T. G. Chowdhury, N. A. Sabaliauskas, K. Laurino, N. C. Barbarich-Marsteller

Research output: Contribution to journalArticle

Abstract

Anorexia nervosa (AN) is a psychiatric illness characterized by restricted eating and an intense fear of gaining weight. Most individuals with AN are females, diagnosed first during adolescence, 40-80% of whom exhibit excessive exercise, and an equally high number with a history of anxiety disorder. We sought to determine the cellular basis for individual differences in AN vulnerability by using an animal model, activity-based anorexia (ABA), that is induced by combining food restriction (FR) with access to a running wheel that allows voluntary exercise. Previously, we showed that by the fourth day of FR, the ABA group of adolescent female rats exhibit >500% greater levels of non-synaptic α4βδ-GABAARs at the plasma membrane of hippocampal CA1 pyramidal cell spines, relative to the levels found in age-matched controls that are not FR and without wheel access. Here, we show that the ABA group exhibits individual differences in body weight loss, with some losing nearly 30%, while others lose only 15%. The individual differences in weight loss are ascribable to individual differences in wheel activity that both precedes and concurs with days of FR. Moreover, the increase in activity during FR correlates strongly and negatively with α4βδ-GABAAR levels (R=-0.9, p<0.01). This negative correlation is evident within 2days of FR, before body weight loss approaches life-threatening levels for any individual. These findings suggest that increased shunting inhibition by α4βδ-GABAARs in spines of CA1 pyramidal neurons may participate in the protection against the ABA-inducing environmental factors of severe weight loss by suppressing excitability of the CA1 pyramidal neurons which, in turn, is related indirectly to suppression of excessive exercise. The data also indicate that, although exercise has many health benefits, it can be maladaptive to individuals with low levels of α4βδ-GABAARs in the CA1, particularly when combined with FR.

Original languageEnglish (US)
Pages (from-to)108-123
Number of pages16
JournalNeuroscience
Volume265
DOIs
StatePublished - Apr 18 2014

Fingerprint

Anorexia
Biomarkers
Food
Individuality
Weight Loss
Pyramidal Cells
Anorexia Nervosa
Exercise
Spine
Body Weight
Insurance Benefits
Anxiety Disorders
Running
Fear
Psychiatry
Animal Models
Eating
Cell Membrane
Weights and Measures

Keywords

  • Adolescence
  • Alpha4-GABA-receptor
  • Anxiety
  • Hippocampus
  • Neuromodulation
  • Stress

ASJC Scopus subject areas

  • Neuroscience(all)
  • Medicine(all)

Cite this

Aoki, C., Wable, G., Chowdhury, T. G., Sabaliauskas, N. A., Laurino, K., & Barbarich-Marsteller, N. C. (2014). α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia. Neuroscience, 265, 108-123. https://doi.org/10.1016/j.neuroscience.2014.01.011

α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia. / Aoki, Chiye; Wable, G.; Chowdhury, T. G.; Sabaliauskas, N. A.; Laurino, K.; Barbarich-Marsteller, N. C.

In: Neuroscience, Vol. 265, 18.04.2014, p. 108-123.

Research output: Contribution to journalArticle

Aoki, C, Wable, G, Chowdhury, TG, Sabaliauskas, NA, Laurino, K & Barbarich-Marsteller, NC 2014, 'α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia', Neuroscience, vol. 265, pp. 108-123. https://doi.org/10.1016/j.neuroscience.2014.01.011
Aoki, Chiye ; Wable, G. ; Chowdhury, T. G. ; Sabaliauskas, N. A. ; Laurino, K. ; Barbarich-Marsteller, N. C. / α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia. In: Neuroscience. 2014 ; Vol. 265. pp. 108-123.
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