Back to Search
Start Over
Collagen type VI regulates TGFβ bioavailability in skeletal muscle.
- Source :
-
BioRxiv : the preprint server for biology [bioRxiv] 2023 Jun 24. Date of Electronic Publication: 2023 Jun 24. - Publication Year :
- 2023
-
Abstract
- Collagen VI-related disorders ( COL6 -RDs) are a group of rare muscular dystrophies caused by pathogenic variants in collagen VI genes ( COL6A1, COL6A2 , and COL6A3 ). Collagen type VI is a heterotrimeric, microfibrillar component of the muscle extracellular matrix (ECM), predominantly secreted by resident fibroadipogenic precursor cells in skeletal muscle. The absence or mislocalizatoion of collagen VI in the ECM underlies the non-cell autonomous dysfunction and dystrophic changes in skeletal muscle with an as of yet elusive direct mechanistic link between the ECM and myofiber dysfunction. Here, we conduct a comprehensive natural history and outcome study in a novel mouse model of COL6 -RDs ( Col6a2 <superscript>-/-</superscript> mice) using standardized (Treat-NMD) functional, histological, and physiologic parameter. Notably, we identify a conspicuous dysregulation of the TGFβ pathway early in the disease process and propose that the collagen VI deficient matrix is not capable of regulating the dynamic TGFβ bioavailability at baseline and also in response to muscle injury. Thus, we propose a new mechanism for pathogenesis of the disease that links the ECM regulation of TGFβ with downstream skeletal muscle abnormalities, paving the way for developing and validating therapeutics that target this pathway.<br />Competing Interests: Conflict of Interest: The authors have declared that no conflict of interest exists.
Details
- Language :
- English
- Database :
- MEDLINE
- Journal :
- BioRxiv : the preprint server for biology
- Accession number :
- 38586035
- Full Text :
- https://doi.org/10.1101/2023.06.22.545964