Journal
EMBO MOLECULAR MEDICINE
Volume 8, Issue 8, Pages 967-986Publisher
WILEY
DOI: 10.15252/emmm.201505944
Keywords
ceftriaxone; glutamate transporter; migraine; Na+,K+ ATPase; spreading depression
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Funding
- Telethon Italy [GGP14234]
- Italian Ministry of University and Research (PRIN)
- University of Padova (Progetto Ateneo)
- INRCA IRCCS
- Universita' Politecnica delle Marche
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Migraine is a common disabling brain disorder. A subtype of migraine with aura (familial hemiplegic migraine type 2: FHM2) is caused by loss-of-function mutations in alpha(2) Na+,K+ ATPase (alpha(2)NKA), an isoform almost exclusively expressed in astrocytes in adult brain. Cortical spreading depression (CSD), the phenomenon that underlies migraine aura and activates migraine headache mechanisms, is facilitated in heterozygous FHM2-knockin mice with reduced expression of alpha(2)NKA. The mechanisms underlying an increased susceptibility to CSD in FHM2 are unknown. Here, we show reduced rates of glutamate and K+ clearance by cortical astrocytes during neuronal activity and reduced density of GLT-1a glutamate transporters in cortical perisynaptic astrocytic processes in heterozygous FHM2-knockin mice, demonstrating key physiological roles of alpha(2)NKA and supporting tight coupling with GLT-1a. Using ceftriaxone treatment of FHM2 mutants and partial inhibition of glutamate transporters in wild-type mice, we obtain evidence that defective glutamate clearance can account for most of the facilitation of CSD initiation in FHM2-knockin mice, pointing to excessive glutamatergic transmission as a key mechanism underlying the vulnerability to CSD ignition in migraine.
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