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Using the Activity-based Anorexia Rodent Model to Study the Neurobiological Basis of Anorexia Nervosa
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White matter microstructural changes in adolescent anorexia nervosa including an exploratory longitudinal study.

Katja Vogel1, Inge Timmers2, Vinod Kumar3

  • 1Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, University Hospital, RWTH Aachen University, Neuenhofer Weg 21, 52074 Aachen, Germany.

Neuroimage. Clinical
|May 17, 2016
PubMed
Summary

Adolescent anorexia nervosa (AN) shows distinct white matter (WM) changes, with higher fractional anisotropy (FA) linked to weight loss. These microstructural brain alterations partially normalize after weight rehabilitation in adolescents.

Keywords:
AdolescenceAnorexia nervosaDTIFractional anisotropyTBSS

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Area of Science:

  • Neuroimaging
  • Adolescent Psychiatry
  • Neuroscience

Background:

  • Anorexia nervosa (AN) commonly emerges in adolescence, yet its pathophysiology at this critical developmental stage remains poorly understood, hindering timely interventions.
  • Diffusion tensor imaging (DTI) is employed to explore microstructural white matter (WM) brain alterations in adolescents with AN, including a longitudinal follow-up component.

Purpose of the Study:

  • To investigate microstructural white matter (WM) brain changes in adolescent females with anorexia nervosa (AN) using diffusion tensor imaging (DTI).
  • To compare WM integrity between adolescent AN patients and typically developing controls.
  • To examine longitudinal changes in WM integrity following weight rehabilitation and explore associations with clinical factors.

Main Methods:

  • Whole-brain diffusion-weighted magnetic resonance imaging scans were acquired from 22 adolescent females with AN at admission and 9 at discharge.
  • Tract-based spatial statistics (TBSS) were used to compare fractional anisotropy (FA) between AN patients and 21 typically developing controls.
  • Multiple linear regression analyzed associations between global WM skeleton FA and weight/illness duration parameters.

Main Results:

  • Adolescent AN patients exhibited increased FA in bilateral frontal, parietal, and temporal WM regions compared to controls.
  • Higher global WM skeleton FA at admission correlated with more rapid weight loss preceding hospitalization.
  • Exploratory longitudinal analysis indicated partial normalization of increased FA after weight rehabilitation.

Conclusions:

  • Adolescent AN presents a distinct pattern of WM microstructural changes compared to adult AN, suggesting age-specific responses to starvation in the developing brain.
  • Elevated FA in adolescent AN may indicate tighter packing of WM fibers.
  • Findings highlight potential time-dependent pathomechanisms and differing susceptibility in adolescent brain development.