OBJECTIVE Our objective was to study the long-term prognosis of sporadic hemiplegic migraine (SHM). METHODS We performed a longitudinal follow-up study in 18 patients who were diagnosed with SHM... Show moreOBJECTIVE Our objective was to study the long-term prognosis of sporadic hemiplegic migraine (SHM). METHODS We performed a longitudinal follow-up study in 18 patients who were diagnosed with SHM between 1993 and 1996. Follow-up time between the first and second survey ranged from nine to 14 years. These patients were included as part of a genetic study in which we systematically analysed the role of the three known familial hemiplegic migraine (FHM) genes. RESULTS In 12 out of 18 patients the clinical diagnosis was unchanged. In two of the six remaining patients the attacks were no longer associated with hemiplegia; one of them had an ATP1A2 gene mutation (E120A). In the four other patients, the diagnosis changed into FHM, because a family member had developed hemiplegic migraine since the initial diagnosis was made. In two of the four patients a mutation was demonstrated (CACNA1A [R583Q] and ATP1A2 [R834X]). CONCLUSION This study shows that the diagnosis of SHM changes into FHM in a considerable percentage of patients (22% [4 of 18]), almost a decade after the initial diagnosis. This indicates that a careful follow-up of SHM patients and their families is advisable for optimal care and counseling. Diagnostic screening of FHM genes in SHM patients can be of value. Our genetic and clinical follow-up studies reinforce the evidence that FHM and SHM are part of the same spectrum of migraine. Show less
Stam, A.H.; Louter, M.A.; Haan, J.; Vries, B. de; Maagdenberg, A.M.J.M. van den; Frants, R.R.; ... ; Terwindt, G.M. 2011
Kaja S, Van de Ven RCG, Broos LAM, Frants RR, Ferrari MD, Van den Maagdenberg AMJM, Plomp JJ. Severe and progressive neurotransmitter release aberrations in familial hemiplegic migraine type 1... Show moreKaja S, Van de Ven RCG, Broos LAM, Frants RR, Ferrari MD, Van den Maagdenberg AMJM, Plomp JJ. Severe and progressive neurotransmitter release aberrations in familial hemiplegic migraine type 1 Cacna1a S218L knock-in mice. J Neurophysiol 104: 1445-1455, 2010. First published July 14, 2010; doi:10.1152/jn.00012.2010. Familial hemiplegic migraine type 1 (FHM1) is caused by mutations in the CACNA1A gene, encoding neuronal presynaptic Ca(V)2.1 (P/Q-type) Ca2+ channels. These channels mediate neurotransmitter release at many central synapses and at the neuromuscular junction (NMJ). Mutation S218L causes a severe neurological phenotype of FHM and, additionally, ataxia and susceptibility to seizures, delayed brain edema, and fatal coma after minor head trauma. Recently, we generated a Cacna1a S218L knock-in mutant mouse, displaying these features and reduced survival. A first electrophysiological study showed high susceptibility for cortical spreading depression, enhanced neuronal soma Ca2+ influx, and at diaphragm NMJs, a considerable increase of neurotransmitter release. We here assessed the function of S218L knock-in NMJs at several muscle types in great detail. Pharmacological analyses using specific Ca-V subtype-blocking toxins excluded compensatory contribution of non-Ca(V)2.1 channels. Endplate potentials were considerably broadened at many NMJs. High rate (40 Hz)-evoked acetylcholine release was slightly reduced; however, it was not associated with block of neurotransmission causing weakness, as assessed with grip strength measurements and in vitro muscle contraction experiments. The synaptopathy clearly progressed with age, including development of an increased acetylcholine release at low-rate nerve stimulation at physiological extracellular Ca2+ concentration and further endplate potential broadening. Our results suggest enhanced Ca2+ influx into motor nerve terminals through S218L-mutated presynaptic Ca(V)2.1 channels, likely because of the earlier reported negative shift of activation potential and reduced inactivation. Similar severe aberrations at central synapses of S218L mutant mice and humans may underlie or contribute to the drastic neurological phenotype. Show less
Klychnikov, O.I.; Li, K.W.; Sidorov, I.A.; Loos, M.; Spijker, S.; Broos, L.A.M.; ... ; Maagdenberg, A.M.J.M. van den 2010
Familial hemiplegic migraine type 1 (FHM1) is caused by missense mutations in the CACNA1A gene that encodes the alpha 1A pore-forming subunit of Ca(v)2.1 Ca2+ channels. Knock-in transgenic mice... Show moreFamilial hemiplegic migraine type 1 (FHM1) is caused by missense mutations in the CACNA1A gene that encodes the alpha 1A pore-forming subunit of Ca(v)2.1 Ca2+ channels. Knock-in transgenic mice expressing Ca(v)2.1 Ca2+ channels with a human pathogenic FHM1 mutation reveal enhanced glutamatergic neurotransmission in the cortex. In this study, we employed an ITRAQ-based LC-LC MS/MS approach to identify differentially expressed proteins in cortical synapse proteomes of Cacna1a R192Q KI and wild-type mice. All expression differences determined were subtle and in the range of 10-30%. Observed upregulated proteins in the mutant mice are Involved in processes, such as neurite outgrowth and actin dynamics, vesicle turnover, and glutamate transporters. Our data support the view that in Cacna1a R192Q KI mice, several compensatory mechanisms counterbalancing a dysregulated glutamatergic signaling have come Into effect. We propose that such adaptation mechanisms at the synapse level may play a role in the pathophysiology of FHM and possibly in the common forms of migraine. Show less
Maagdenberg, A.M.J.M. van den; Pizzorusso, T.; Kaja, S.; Terpolilli, N.; Shapovalova, M.; Hoebeek, F.E.; ... ; Ferrari, M.D. 2010
Objective: The CACNA1A gene encodes the pore-forming subunit of neuronal Ca(V)2.1 Ca2+ channels. In patients, the S218L CACNA1A mutation causes a dramatic hemiplegic migraine syndrome that is... Show moreObjective: The CACNA1A gene encodes the pore-forming subunit of neuronal Ca(V)2.1 Ca2+ channels. In patients, the S218L CACNA1A mutation causes a dramatic hemiplegic migraine syndrome that is associated with ataxia, seizures, and severe, sometimes fatal, brain edema often triggered by only a mild head trauma. Methods: We introduced the S218L mutation into the mouse Cacna1a gene and studied the mechanisms for the S218L syndrome by analyzing the phenotypic, molecular, and electrophysiological consequences. Results: Cacna1a(S218L) mice faithfully mimic the associated clinical features of the human S218L syndrome. S218L neurons exhibit a gene dosage-dependent negative shift in voltage dependence of Ca(V)2.1 channel activation, resulting in enhanced neurotransmitter release at the neuromuscular junction. Cacna1a(S218L) mice also display an exquisite sensitivity to cortical spreading depression (CSD), with a vastly reduced triggering threshold, an increased propagation velocity, and frequently multiple CSD events after a single stimulus. In contrast, mice bearing the R192Q CACNA1A mutation, which in humans causes a milder form of hemiplegic migraine, typically exhibit only a single CSD event after one triggering stimulus. Interpretation: The particularly low CSD threshold and the strong tendency to respond with multiple CSD events make the S218L cortex highly vulnerable to weak stimuli and may provide a mechanistic basis for the dramatic phenotype seen in S218L mice and patients. Thus, the S218L mouse model may prove a valuable tool to further elucidate mechanisms underlying migraine, seizures, ataxia, and trauma-triggered cerebral edema. ANN NEUROL 2010;67:85-98 Show less
Objective: To investigate the co-occurrence of migraine and depression and assess whether shared genetic factors may underlie both diseases. Methods: Subjects were 2,652 participants of the Erasmus... Show moreObjective: To investigate the co-occurrence of migraine and depression and assess whether shared genetic factors may underlie both diseases. Methods: Subjects were 2,652 participants of the Erasmus Rucphen Family genetic isolate study. Migraine was diagnosed using a validated 3-stage screening method that included a telephone interview. Symptoms of depression were assessed using the Center for Epidemiologic Studies Depression scale and the depression subscale of the Hospital Anxiety and Depression Scale (HADS-D). The contribution of shared genetic factors in migraine and depression was investigated by comparing heritability estimates for migraine with and without adjustment for symptoms of depression, and by comparing the heritability scores of depression between migraineurs and controls. Results: We identified 360 migraine cases: 209 had migraine without aura ( MO) and 151 had migraine with aura ( MA). Odds ratios for depression in patients with migraine were 1.29 (95% confidence interval [CI] 0.98-1.70) for MO and 1.70 ( 95% CI 1.28-2.24) for MA. Heritability estimates were significant for all migraine (0.56), MO (0.77), and MA (0.96), and decreased after adjustment for symptoms of depression or use of antidepressant medication, in particular for MA. Comparison of the heritability scores for depression between patients with migraine and controls showed a genetic correlation between HADS-D score and MA. Conclusions: There is a bidirectional association between depression and migraine, in particular migraine with aura, which can be explained, at least partly, by shared genetic factors. Neurology (R) 2010; 74: 288-294 Show less
OBJECTIVE To investigate the co-occurrence of migraine and depression and assess whether shared genetic factors may underlie both diseases. METHODS Subjects were 2,652 participants of the Erasmus... Show moreOBJECTIVE To investigate the co-occurrence of migraine and depression and assess whether shared genetic factors may underlie both diseases. METHODS Subjects were 2,652 participants of the Erasmus Rucphen Family genetic isolate study. Migraine was diagnosed using a validated 3-stage screening method that included a telephone interview. Symptoms of depression were assessed using the Center for Epidemiologic Studies Depression scale and the depression subscale of the Hospital Anxiety and Depression Scale (HADS-D). The contribution of shared genetic factors in migraine and depression was investigated by comparing heritability estimates for migraine with and without adjustment for symptoms of depression, and by comparing the heritability scores of depression between migraineurs and controls. RESULTS We identified 360 migraine cases: 209 had migraine without aura (MO) and 151 had migraine with aura (MA). Odds ratios for depression in patients with migraine were 1.29 (95% confidence interval [CI] 0.98-1.70) for MO and 1.70 (95% CI 1.28-2.24) for MA. Heritability estimates were significant for all migraine (0.56), MO (0.77), and MA (0.96), and decreased after adjustment for symptoms of depression or use of antidepressant medication, in particular for MA. Comparison of the heritability scores for depression between patients with migraine and controls showed a genetic correlation between HADS-D score and MA. CONCLUSIONS There is a bidirectional association between depression and migraine, in particular migraine with aura, which can be explained, at least partly, by shared genetic factors. Show less
