Trigeminal Nerve Microstructure, Neuroinflammation, and Brainstem Function in Migraine
Overview
This study demonstrates that migraine patients exhibit altered microstructure of the trigeminal nerve root, characterized by reduced fractional anisotropy, which correlates with increased neuroinflammation and decreased brainstem functional activation. These findings highlight the trigeminal system's integral role in migraine pathophysiology and suggest potential targets for therapeutic intervention.
Background
Migraine is a prevalent neurological disorder marked by recurrent headaches primarily involving the ophthalmic branch of the trigeminal nerve. The trigeminovascular system's activation and sensitization are central to migraine pathophysiology, yet the underlying neural mechanisms remain incompletely understood. Advanced neuroimaging techniques, such as ultra-high field 7 T MRI and PET, enable detailed investigation of trigeminal nerve microstructure, neuroinflammation, and brainstem function. Prior studies have not comprehensively combined these modalities to elucidate the integrated neural alterations in migraine.
Lower activation in migraine patients correlating with reduced FA
Right vs Left Side Findings
Right headache-dominant patients
Left headache-dominant patients
Right side showed more robust alterations and higher migraine severity
Key Findings
Migraine patients show reduced fractional anisotropy at the trigeminal nerve root compared to healthy controls, indicating altered white matter microstructure.
Lower fractional anisotropy correlates with increased neuroinflammation as measured by elevated 11C-PBR28 PET signal at the trigeminal nerve root.
Functional MRI reveals decreased activation in the ipsilateral pontine region consistent with the spinal trigeminal nucleus in migraine patients.
These structural and functional abnormalities are more pronounced on the right side, aligning with greater migraine severity in right headache-dominant patients.
The study integrates multimodal imaging to link microstructural changes, neuroinflammation, and functional deficits within the trigeminal system in migraine.
Clinical Implications
The identification of trigeminal nerve microstructural alterations coupled with neuroinflammation and reduced brainstem function underscores the trigeminal system as a critical target for migraine therapies. Clinicians should consider the role of neuroinflammatory processes in migraine pathogenesis, which may inform the development of novel anti-inflammatory or neuroprotective treatments. Additionally, the lateralization of findings suggests that headache dominance may guide personalized therapeutic approaches.
Conclusion
This multimodal neuroimaging study provides compelling evidence that trigeminal nerve remodeling, involving microstructural disruption and neuroinflammation, is closely linked to impaired brainstem function in migraine. These insights advance understanding of migraine pathophysiology and highlight potential avenues for targeted intervention.
References
Original Article 2024 -- Association of Trigeminal Nerve Microstructure with Neuroinflammation and Brainstem Function in Migraine
by Sarasa Tohyama, Michael Datko, Ludovica Brusaferri, Lillian D Kinder, Jack H Schnieders, Mackenzie Hyman, Alison M Goldstein, Melaina D Gilbert, Hope Housman, Vi Le, Kassandra Round, Frances Marin, Megan R Heffernan, Ronald G Garcia, Randy L Gollub, Robert R Edwards, Bruce R Rosen, Nouchine Hadjikhani, Hsinlin T Cheng, Zev Schuman-Olivier, Marco L Loggia, Vitaly Napadow
