Novel roles for scleraxis in regulating adult tenocyte function.
Abstract: Tendinopathies are common and difficult to resolve due to the formation of scar tissue that reduces the mechanical integrity of the tissue, leading to frequent reinjury. Tenocytes respond to both excessive loading and unloading by producing pro-inflammatory mediators, suggesting that these cells are actively involved in the development of tendon degeneration. The transcription factor scleraxis (Scx) is required for the development of force-transmitting tendon during development and for mechanically stimulated tenogenesis of stem cells, but its function in adult tenocytes is less well-defined. The aim of this study was to further define the role of Scx in mediating the adult tenocyte mechanoresponse. Equine tenocytes exposed to siRNA targeting Scx or a control siRNA were maintained under cyclic mechanical strain before being submitted for RNA-seq analysis. Focal adhesions and extracellular matrix-receptor interaction were among the top gene networks downregulated in Scx knockdown tenocytes. Correspondingly, tenocytes exposed to Scx siRNA were significantly softer, with longer vinculin-containing focal adhesions, and an impaired ability to migrate on soft surfaces. Other pathways affected by Scx knockdown included increased oxidative phosphorylation and diseases caused by endoplasmic reticular stress, pointing to a larger role for Scx in maintaining tenocyte homeostasis. Our study identifies several novel roles for Scx in adult tenocytes, which suggest that Scx facilitates mechanosensing by regulating the expression of several mechanosensitive focal adhesion proteins. Furthermore, we identified a number of other pathways and targets affected by Scx knockdown that have the potential to elucidate the role that tenocytes may play in the development of degenerative tendinopathy.
Publication Date: 2018-08-07 PubMed ID: 30086712PubMed Central: PMC6081934DOI: 10.1186/s12860-018-0166-zGoogle Scholar: Lookup
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Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
This study investigates the role of the scleraxis (Scx) protein in adult tenocytes (cells that help maintain tendon health), suggesting it facilitates their ability to sense mechanical stimuli. It also reveals that reducing Scx levels affects several other functions of tenocytes, which may illuminate how these cells contribute to degenerative tendon diseases.
Objective of the Study
- The study aims to delve deeper into understanding the function of the scleraxis (Scx) protein in adult tenocytes, which are cells vital for maintaining tendon health. It seeks to comprehend the effect of reducing Scx levels on these cells.
Methodology of the Study
- The researchers introduced small interfering RNA (siRNA) to equine tenocytes to reduce the levels of Scx. This method, known as Scx knockdown, aimed to observe how these reduced Scx levels would impact the tenocytes.
- The tenocytes were then put under cyclic mechanical strain before undergoing a RNA-seq analysis. This analysis aids in examining the impact of the Scx knockdown on the genes within the tenocytes.
Findings of the Study
- The study found that crucial gene networks, specifically the focal adhesions and extracellular matrix-receptor interactions, were significantly downregulated when Scx was knocked down.
- Tenocytes with reduced Scx levels were found to be softer, with extended vinculin-containing focal adhesions. They also displayed an impaired ability to move on soft surfaces.
- The Scx knockdown also elevated oxidative phosphorylation types and diseases caused by Endoplasmic Reticulum (ER) stress, suggesting Scx plays a larger role in keeping the tenocyte’s state balanced (homeostasis).
Implications of the Study
- The study uncovers several new roles for Scx in adult tenocytes, especially in enabling these cells to sense mechanosensitive stimuli. It arrives at this conclusion by assessing the impact on various mechanosensitive focal adhesion proteins when Scx levels are reduced.
- Moving forward, these findings could reveal other pathways and targets influenced by Scx knockdown. This could possibly elucidate the role that tenocytes play in developing degenerative tendon diseases, allowing for further advancements in the field.
Cite This Article
APA
Nichols AEC, Settlage RE, Werre SR, Dahlgren LA.
(2018).
Novel roles for scleraxis in regulating adult tenocyte function.
BMC Cell Biol, 19(1), 14.
https://doi.org/10.1186/s12860-018-0166-z Publication
Researcher Affiliations
- Department of Large Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, 205 Duck Pond Drive, Blacksburg, VA, 24061-0442, USA.
- Advanced Research Computing, Virginia Biocomplexity Institute, Virginia Tech, Blacksburg, VA, 24061, USA.
- Laboratory for Study Design and Statistical Analysis, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA.
- Department of Large Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, 205 Duck Pond Drive, Blacksburg, VA, 24061-0442, USA. lad11@vt.edu.
MeSH Terms
- Aging / metabolism
- Animals
- Base Composition / genetics
- Basic Helix-Loop-Helix Transcription Factors / metabolism
- Cell Movement
- Cell Nucleus Shape
- Cytoskeleton / metabolism
- Down-Regulation / genetics
- Focal Adhesions / metabolism
- Gene Expression Profiling
- Gene Knockdown Techniques
- Gene Ontology
- Horses
- RNA, Messenger / genetics
- RNA, Messenger / metabolism
- RNA, Small Interfering / metabolism
- Reproducibility of Results
- Sequence Analysis, RNA
- Tendons / cytology
- Tenocytes / metabolism
Conflict of Interest Statement
ETHICS APPROVAL AND CONSENT TO PARTICIPATE: Collection of equine tissues for cell isolation was approved by the Virginia Tech IACUC under protocols 14–128 and 15–059. CONSENT FOR PUBLICATION: Not applicable COMPETING INTERESTS: The authors declare that they have no competing interests. PUBLISHER’S NOTE: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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