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Research ArticleNew Research, Sensory and Motor Systems

Altered Brain Structure and Function Correlate with Disease Severity and Pain Catastrophizing in Migraine Patients

Catherine S. Hubbard, Shariq A. Khan, Michael L. Keaser, Vani A. Mathur, Madhav Goyal and David A. Seminowicz
eNeuro 12 November 2014, 1 (1) ENEURO.0006-14.2014; DOI: https://doi.org/10.1523/ENEURO.0006-14.2014
Catherine S. Hubbard
1Department of Neural and Pain Sciences, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, and
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Shariq A. Khan
1Department of Neural and Pain Sciences, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, and
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Michael L. Keaser
1Department of Neural and Pain Sciences, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, and
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Vani A. Mathur
1Department of Neural and Pain Sciences, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, and
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Madhav Goyal
2Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21218
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David A. Seminowicz
1Department of Neural and Pain Sciences, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, and
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Abstract

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Migraine patients (Pts) show widespread structural and functional brain changes that are associated with symptoms and increased pain catastrophizing A, Migraine patients showed (i) increased gray matter volume (GMV) in the left (L) hippocampus and (ii) decreased cortical thickness in the L anterior midcingulate cortex (aMCC) compared to healthy control subjects. B, Pain catastrophizing correlated with GMV reductions in the (i) L primary somatosensory cortex (S1) and (ii) L medial prefrontal cortex (mPFC), and cortical thinning in the (iii) L dorsolateral prefrontal cortex (DLPFC) and middle temporal gyrus (MTG) in migraine patients. C, GMV reductions correlated with (i) disease duration (ii), attack frequency, and (iii) migraine pain intensity in patients. D, Whole-brain overlay maps for migraine patients and healthy controls for the (i) L PCC, (ii) L aINS, and (iii) aMCC seed regions rendered onto inflated brains. Red represents resting-state functional connectivity for healthy controls and green represents the same maps in migraine patients. Yellow represents areas showing overlap in functional connectivity in controls and migraineurs. Images are thresholded at T = 4.5 (cluster extent = 25) for visualization purposes. The schematic illustrates the relationship between disease severity measures and pain catastrophizing and disruptions in functional connectivity between the default mode network (DMN), central executive network (CEN), and salience network (SN) in migraine patients. In patients, pain catastrophizing correlated with increased coupling between DMN and CEN nodes (PCC-DLPFC), whereas disease duration and migraine pain intensity correlated with SN-DMN network decoupling (aINS/aMCC-mPFC), and increased SN-CEN (aMCC-aINS) network coupling, respectively.

To investigate the neuroanatomical and functional brain changes in migraine patients relative to healthy controls, we used a combined analytical approach including voxel- and surface-based morphometry along with resting-state functional connectivity to determine whether areas showing structural alterations in patients also showed abnormal functional connectivity. Additionally, we wanted to assess whether these structural and functional changes were associated with group differences in pain catastrophizing and migraine-related disease variables in patients. We acquired T1-weighted anatomical and functional magnetic resonance imaging scans during rest in human subjects with a diagnosis of migraine and healthy controls. Structural analyses revealed greater left hippocampal gray matter volume and reduced cortical thickness in the left anterior midcingulate in patients compared with controls. We also observed negative associations between pain catastrophizing and migraine disease variables and gray matter in areas implicated in processing the sensory, affective, and cognitive aspects of pain in patients. Functional connectivity analyses showed that migraine patients displayed disrupted connectivity between default mode, salience, cognitive, visuospatial, and sensorimotor networks, which was associated with group differences in pain catastrophizing and migraine-related disease variables in patients. Together, our findings show widespread morphological and functional brain abnormalities in migraineurs in affective, cognitive, visual, and pain-related brain areas, which are associated with increased pain catastrophizing, disease chronicity, and severity of symptoms, suggesting that these structural and functional changes may be a consequence of repeated, long-term nociceptive signaling leading to increased pain sensitivity, mood disturbances, and maladaptive coping strategies to deal with unrelenting pain.

  • chronic pain
  • gray matter
  • headache
  • intrinsic connectivity
  • neuroimaging
  • resting-state networks

Footnotes

  • ↵2 We thank the University of Maryland Magnetic Resonance Research Center, Dr. Rao Gullapalli and George Makris for their assistance with data collection. We would also like to express our gratitude to all the participants who took part in this study. The authors declare no competing financial interests.

This is an open-access article distributed under the terms of the Creative Commons Attribution License Attribution-Noncommercial 4.0 International which permits noncommercial reuse provided that the original work is properly attributed.

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Altered Brain Structure and Function Correlate with Disease Severity and Pain Catastrophizing in Migraine Patients
Catherine S. Hubbard, Shariq A. Khan, Michael L. Keaser, Vani A. Mathur, Madhav Goyal, David A. Seminowicz
eNeuro 12 November 2014, 1 (1) ENEURO.0006-14.2014; DOI: 10.1523/ENEURO.0006-14.2014

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Altered Brain Structure and Function Correlate with Disease Severity and Pain Catastrophizing in Migraine Patients
Catherine S. Hubbard, Shariq A. Khan, Michael L. Keaser, Vani A. Mathur, Madhav Goyal, David A. Seminowicz
eNeuro 12 November 2014, 1 (1) ENEURO.0006-14.2014; DOI: 10.1523/ENEURO.0006-14.2014
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Keywords

  • chronic pain
  • gray matter
  • headache
  • intrinsic connectivity
  • neuroimaging
  • resting-state networks

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