Suppressing Hippo signaling in the stem cell niche promotes skeletal muscle regeneration.

Autor: Liu Q; Wafic Said Molecular Cardiology Research Laboratories, Texas Heart Institute, Houston, Texas, USA., Pan S; Wafic Said Molecular Cardiology Research Laboratories, Texas Heart Institute, Houston, Texas, USA., Liu S; Cardiomyocyte Renewal Laboratory, Texas Heart Institute, Houston, Texas, USA., Zhang S; Cardiomyocyte Renewal Laboratory, Texas Heart Institute, Houston, Texas, USA., Willerson JT; Texas Heart Institute, Houston, Texas, USA., Martin JF; Cardiomyocyte Renewal Laboratory, Texas Heart Institute, Houston, Texas, USA.; Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, USA., Dixon RAF; Wafic Said Molecular Cardiology Research Laboratories, Texas Heart Institute, Houston, Texas, USA.
Jazyk: angličtina
Zdroj: Stem cells (Dayton, Ohio) [Stem Cells] 2021 Jun; Vol. 39 (6), pp. 737-749. Date of Electronic Publication: 2021 Feb 18.
DOI: 10.1002/stem.3343
Abstrakt: Lack of blood flow to the lower extremities in peripheral arterial disease causes oxygen and nutrient deprivation in ischemic skeletal muscles, leading to functional impairment. Treatment options for muscle regeneration in this scenario are lacking. Here, we selectively targeted the Hippo pathway in myofibers, which provide architectural support for muscle stem cell niches, to facilitate functional muscle recovery in ischemic extremities by promoting angiogenesis, neovascularization, and myogenesis. We knocked down the core Hippo pathway component, Salvador (SAV1), by using an adeno-associated virus 9 (AAV9) vector expressing a miR30-based triple short-hairpin RNA (shRNA), controlled by a muscle-specific promoter. In a mouse hindlimb-ischemia model, AAV9 SAV1 shRNA administration in ischemic muscles induced nuclear localization of the Hippo effector YAP, accelerated perfusion restoration, and increased exercise endurance. Intravascular lectin labeling of the vasculature revealed enhanced angiogenesis. Using 5-ethynyl-2'-deoxyuridine to label replicating cellular DNA in vivo, we found SAV1 knockdown concurrently increased paired box transcription factor Pax7+ muscle satellite cell and CD31+ endothelial cell proliferation in ischemic muscles. To further study Hippo suppression in skeletal muscle regeneration, we used a cardiotoxin-induced muscle damage model in adult (12-15 weeks old) and aged mice (26-month old). Two weeks after delivery of AAV9 SAV1 shRNA into injured muscles, the distribution of regenerative myofibers shifted toward a larger cross-sectional area and increased capillary density compared with mice receiving AAV9 control. Together, these findings suggest our approach may have clinical promise in regenerative therapy for leg ischemia and muscle injury.
(© AlphaMed Press 2021.)
Databáze: MEDLINE
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