In medication-overuse headache, fMRI shows long-lasting dysfunction in midbrain areas
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Published on: June 2, 2014
Stefania Ferraro1, Licia Grazzi, Riccardo Muffatti
1Neuroradiology Department, Foundation IRCCS Neurological Institute Carlo Besta, Milan, Italy. stefania.ferraro@istituto-besta.it
Objective:
The primary aim of our study was to evaluate if a group of medication-overuse headache (MOH) patients present dysfunctions in the mesocorticolimbic dopamine circuit. The secondary aim was to disentangle the role of the medication overuse and of the acute/chronic headache in determining these alterations and to investigate their persistence.
Background:
Several researches have suggested that MOH may belong to the spectrum of addictive behavior. Preclinical models and neuroimaging studies have consistently demonstrated that in addiction, critical long-lasting alterations occur in the mesocorticolimbic dopamine circuit. If MOH shares some neurophysiological features with addiction, long-lasting functional alterations of the mesocorticolimbic dopamine system related to medication overuse should be present.
Methods:
We collected functional magnetic resonance imaging data during the execution of a decision-making under risk paradigm in 8 MOH patients immediately after beginning medication withdrawal, in 8 detoxified MOH patients at 6 months after beginning medication withdrawal, in 8 chronic migraine patients, and in 8 control subjects.
Results:
Our results revealed that MOH patients present: (1) reduced task-related activity in the substantia nigra/ventral tegmental area complex and increased activity in the ventromedial prefrontal cortex, when compared with controls; (2) reduced activity in the substantia nigra/ventral tegmental area complex, when compared with chronic migraine patients; (3) increased activity in the ventromedial prefrontal cortex, when compared with detoxified MOH patients.
Conclusion:
Our study showed that MOH patients present dysfunctions in the mesocorticolimbic dopamine circuit, in particular in the ventromedial prefrontal cortex and in the substantia nigra/ventral tegmental area complex. The ventromedial prefrontal cortex dysfunctions seem to be reversible and attributable to the acute/chronic headache, whereas the substantia nigra/ventral tegmental area complex dysfunctions are persistent and possibly related to medication overuse. These dysfunctions might be the expression of long-lasting neuroadaptations related to the overuse of medications and/or a pre-existing neurophysiological condition leading to vulnerability to medication overuse. The observed persistent dysfunctions in the midbrain dopamine suggest that MOH may share some neurophysiological features with addiction.
Insights
Medication-overuse headache (MOH) is linked to dopamine circuit dysfunction, particularly in the substantia nigra/ventral tegmental area, suggesting addiction-like neuroadaptations. Some prefrontal cortex changes are reversible with headache treatment.
Area of Science:
- Neuroscience
- Neurology
- Addiction Research
Background:
- Medication-overuse headache (MOH) may share neurophysiological similarities with addictive behaviors.
- Addiction is characterized by long-lasting alterations in the mesocorticolimbic dopamine circuit.
- Investigating MOH's dopamine system can elucidate shared features with addiction.
Purpose of the Study:
- To evaluate mesocorticolimbic dopamine circuit dysfunctions in medication-overuse headache (MOH) patients.
- To differentiate the roles of medication overuse and headache chronicity in these alterations.
- To determine the persistence of observed neurophysiological changes.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used during a decision-making under risk task.
- Participants included MOH patients (acute withdrawal), detoxified MOH patients (6 months), chronic migraine patients, and healthy controls.
- Group comparisons assessed task-related brain activity in key dopamine pathway regions.
Main Results:
- MOH patients exhibited reduced substantia nigra/ventral tegmental area (SN/VTA) activity and increased ventromedial prefrontal cortex (vmPFC) activity compared to controls.
- Reduced SN/VTA activity was also observed in MOH patients compared to chronic migraine patients.
- Detoxified MOH patients showed normalized vmPFC activity, while SN/VTA dysfunctions persisted.
Conclusions:
- MOH patients display significant dysfunctions in the mesocorticolimbic dopamine circuit (SN/VTA and vmPFC).
- vmPFC alterations appear reversible and linked to headache chronicity.
- Persistent SN/VTA dysfunctions suggest medication overuse-related neuroadaptations, potentially linking MOH to addiction.
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