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Papers: 12 Mar 2022 - 18 Mar 2022

Animal Studies


2022 Mar 15

J Am Heart Assoc

Migraine-Associated Mutation in the Na,K-ATPase Leads to Disturbances in Cardiac Metabolism and Reduced Cardiac Function.


Staehr C, Rohde P D, Krarup N T, Ringgaard S, Laustsen C, Johnsen J, Nielsen R, Beck H C, Morth J P, Lykke-Hartmann K, Jespersen N R, Abramochkin D, Nyegaard M, Bøtker H E, Aalkjaer C, Matchkov V
J Am Heart Assoc. 2022 Mar 15:e021814.
PMID: 35289188.


Background Mutations in gene encoding the Na,K-ATPase α isoform are associated with familial hemiplegic migraine type 2. Migraine with aura is a known risk factor for heart disease. The Na,K-ATPase is important for cardiac function, but its role for heart disease remains unknown. We hypothesized that is a susceptibility gene for heart disease and aimed to assess the underlying disease mechanism. Methods and Results Mice heterozygous for the familial hemiplegic migraine type 2-associated G301R mutation in the gene (α mice) and matching wild-type controls were compared. Reduced expression of the Na,K-ATPase α isoform and increased expression of the α isoform were observed in hearts from α mice (Western blot). Left ventricular dilation and reduced ejection fraction were shown in hearts from 8-month-old α mice (cardiac magnetic resonance imaging), and this was associated with reduced nocturnal blood pressure (radiotelemetry). Cardiac function and blood pressure of 3-month-old α mice were similar to wild-type mice. Amplified Na,K-ATPase-dependent Src kinase/Ras/Erk1/2 (p44/42 mitogen-activated protein kinase) signaling was observed in hearts from 8-month-old α mice, and this was associated with mitochondrial uncoupling (respirometry), increased oxidative stress (malondialdehyde measurements), and a heart failure-associated metabolic shift (hyperpolarized magnetic resonance). Mitochondrial membrane potential (5,5´,6,6´-tetrachloro-1,1´,3,3´-tetraethylbenzimidazolocarbocyanine iodide dye assay) and mitochondrial ultrastructure (transmission electron microscopy) were similar between the groups. Proteomics of heart tissue further suggested amplified Src/Ras/Erk1/2 signaling and increased oxidative stress and provided the molecular basis for systolic dysfunction in 8-month-old α mice. Conclusions Our findings suggest that mutation leads to disturbed cardiac metabolism and reduced cardiac function mediated via Na,K-ATPase-dependent reactive oxygen species signaling through the Src/Ras/Erk1/2 pathway.