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A Type 2 Deiodinase-Dependent Increase in Vegfa Mediates Myoblast-Endothelial Cell Crosstalk During Skeletal Muscle Regeneration
- Source :
- Thyroid. 31:115-127
- Publication Year :
- 2021
- Publisher :
- Mary Ann Liebert Inc, 2021.
-
Abstract
- Background: The type 2 deiodinase (DIO2) converts thyroxine to 3,3′,5-triiodothyronine (T3), modulating intracellular T3. An increase in DIO2 within muscle stem cells during skeletal muscle regeneration leads to T3-dependent potentiation of differentiation. The muscle stem cell niche comprises numerous cell types, which coordinate the regeneration process. For example, muscle stem cells provide secretory signals stimulating endothelial cell-mediated vascular repair, and, in turn, endothelial cells promote muscle stem differentiation. We hypothesized that Dio2 loss in muscle stem cells directly impairs muscle stem cell-endothelial cell communication, leading to downstream disruption of endothelial cell function. Methods: We assessed the production of proangiogenic factors in differentiated C2C12 cells and in a C2C12 cell line without Dio2 (D2KO C2C12) by real-time quantitative-polymerase chain reaction and enzyme-linked immunosorbent assay. Conditioned medium (CM) was collected daily in parallel to evaluate its effects on human umbilical vein endothelial cell (HUVEC) proliferation, migration and chemotaxis, and vascular network formation. The effects of T3-treatment on vascular endothelial growth factor (Vegfa) mRNA expression in C2C12 cells and mouse muscle were assessed. Chromatin immunoprecipitation (ChIP) identified thyroid hormone receptor (TR) binding to the Vegfa gene. Using mice with a targeted disruption of Dio2 (D2KO mice), we determined endothelial cell number by immunohistochemistry/flow cytometry and evaluated related gene expression in both uninjured and injured skeletal muscle. Results: In differentiated D2KO C2C12 cells, Vegfa expression was 46% of wildtype (WT) C2C12 cells, while secreted VEGF was 45%. D2KO C2C12 CM exhibited significantly less proangiogenic effects on HUVECs. In vitro and in vivo T3 treatment of C2C12 cells and WT mice, and ChIP using antibodies against TRα, indicated that Vegfa is a direct genomic T3 target. In uninjured D2KO soleus muscle, Vegfa expression was decreased by 28% compared with WT mice, while endothelial cell numbers were decreased by 48%. Seven days after skeletal muscle injury, D2KO mice had 36% fewer endothelial cells, coinciding with an 83% decrease in Vegfa expression in fluorescence-activated cell sorting purified muscle stem cells. Conclusion: Dio2 loss in the muscle stem cell impairs muscle stem cell-endothelial cell crosstalk via changes in the T3-responsive gene Vegfa, leading to downstream impairment of endothelial cell function both in vitro and in vivo.
- Subjects :
- deiodinase
Male
Vascular Endothelial Growth Factor A
Myoblasts, Skeletal
Endocrinology, Diabetes and Metabolism
Human Umbilical Vein Endothelial Cell
Deiodinase
Neovascularization, Physiologic
DIO2
030209 endocrinology & metabolism
Muscle Development
Iodide Peroxidase
Cell Line
Mice
03 medical and health sciences
0302 clinical medicine
Endocrinology
Cell Movement
satellite cell
Paracrine Communication
medicine
Regeneration
Myocyte
skeletal muscle
Muscle, Skeletal
Cell Proliferation
Mice, Knockout
biology
Animal
Chemistry
angiogenesi
Skeletal muscle
thyroid hormone
VEGF
Up-Regulation
Cell biology
Mice, Inbred C57BL
Endothelial stem cell
Vascular endothelial growth factor A
medicine.anatomical_structure
030220 oncology & carcinogenesis
biology.protein
Stem cell
Intracellular
Human
Signal Transduction
Subjects
Details
- ISSN :
- 15579077 and 10507256
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Thyroid
- Accession number :
- edsair.doi.dedup.....1c609d2ae50051fea147fecbbee50133