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037 _ _ |a DKFZ-2019-01086
041 _ _ |a eng
082 _ _ |a 610
100 1 _ |a Bauer, Ralf
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245 _ _ |a Various effects of AAV9-mediated βARKct gene therapy on the heart in dystrophin-deficient (mdx) mice and δ-sarcoglycan-deficient (Sgcd-/-) mice.
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a So far effective strategies to treat cardiomyopathy in patients with muscular dystrophies are still not clearly defined. Previously, treatment with β-blockers showed beneficial effects on the development of cardiomyopathy in dystrophin-deficient (mdx) mice, but not in δ-sarcoglycan-deficient (Sgcd-/-) mice. We therefore aimed to study a more specific approach to target maladaptive β-adrenergic signalling in these mice. It has been shown that lowering cardiac G-protein-coupled-receptor-kinase-2 (GRK2) activity with βARKct expression, a peptide inhibitor of protein-coupled-receptor-kinase-2 (GRK2), results in improvement of heart failure in several different animal models. We therefore investigated whether adeno-associated virus type 9 (AAV9)-mediated gene delivery of βARKct, could ameliorate cardiac pathology in mdx and Sgcd-/- mice. We found that long-term treatment with AAV9- βARKct-cDNA with a cardiac-specific promoter significantly improves left ventricular systolic function and reduces myocardial hypertrophy in mdx mice, whereas only mild beneficial effects on cardiac function is observed in Sgcd-/- mice. Interestingly, in contrast to mdx mice neither GRK2 nor nuclear-factor-kappaB (NFκB) were upregulated in Sgcd-/- mice. Taken together, effectiveness of AAV-mediated βARKct therapy may vary between different genetic mutations and presumably depend on the state of adrenergic dysregulation mediated through the upregulation of GRK2.
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700 1 _ |a Enns, Helene
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700 1 _ |a Jungmann, Andreas
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700 1 _ |a Leuchs, Barbara
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700 1 _ |a Volz, Christian
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700 1 _ |a Schinkel, Stefanie
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700 1 _ |a Koch, Walter J
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700 1 _ |a Raake, Philip W
|b 7
700 1 _ |a Most, Patrick
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700 1 _ |a Katus, Hugo A
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700 1 _ |a Müller, Oliver J
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773 _ _ |a 10.1016/j.nmd.2018.12.006
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