Loss of Smad4 in the scleraxis cell lineage results in postnatal joint contracture.

Autor: Schlesinger SY; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA., Seo S; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA., Pryce BA; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA., Tufa SF; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA., Keene DR; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA., Huang AH; Department of Orthopedic, Icahn School of Medicine at Mount Sinai, New York, NY, 10037, USA., Schweitzer R; Research Division, Shriners Hospital for Children, Portland, OR, 97239, USA; Department of Orthopedics, Oregon Health and Science University, Portland, OR, USA. Electronic address: schweitz@ohsu.edu.
Jazyk: angličtina
Zdroj: Developmental biology [Dev Biol] 2021 Feb; Vol. 470, pp. 108-120. Date of Electronic Publication: 2020 Nov 25.
DOI: 10.1016/j.ydbio.2020.11.006
Abstrakt: Growth of the musculoskeletal system requires precise coordination between bone, muscle, and tendon during development. Insufficient elongation of the muscle-tendon unit relative to bone growth results in joint contracture, a condition characterized by reduction or complete loss of joint range of motion. Here we establish a novel murine model of joint contracture by targeting Smad4 for deletion in the tendon cell lineage using Scleraxis-Cre (ScxCre). Smad4 ScxCre mutants develop a joint contracture shortly after birth. The contracture is stochastic in direction and increases in severity with age. Smad4 ScxCre mutant tendons exhibited a stable reduction in cellularity and a progressive reduction in extracellular matrix volume. Collagen fibril diameters were reduced in the Smad4 ScxCre mutants, suggesting a role for Smad4 signaling in the regulation of matrix accumulation. Although ScxCre also has sporadic activity in both cartilage and muscle, we demonstrate an essential role for Smad4 loss in tendons for the development of joint contractures. Disrupting the canonical TGFβ-pathway in Smad2;3 ScxCre mutants did not result in joint contractures. Conversely, disrupting the BMP pathway by targeting BMP receptors (Alk3 ScxCre /Alk6 null ) recapitulated many features of the Smad4 ScxCre contracture phenotype, suggesting that joint contracture in Smad4 ScxCre mutants is caused by disruption of BMP signaling. Overall, these results establish a model of murine postnatal joint contracture and a role for BMP signaling in tendon elongation and extracellular matrix accumulation.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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