BMP receptor signaling is required for postnatal maintenance of articular cartilage

Articular cartilage plays an essential role in health and mobility, but is frequently damaged or lost in millions of people that develop arthritis. The molecular mechanisms that create and maintain this thin layer of cartilage that covers the surface of bones in joint regions are poorly understood,...

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Veröffentlicht in:PLoS biology 2004-11, Vol.2 (11), p.e355-e355
Hauptverfasser: Rountree, Ryan B, Schoor, Michael, Chen, Hao, Marks, Melissa E, Harley, Vincent, Mishina, Yuji, Kingsley, David M
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container_end_page e355
container_issue 11
container_start_page e355
container_title PLoS biology
container_volume 2
creator Rountree, Ryan B
Schoor, Michael
Chen, Hao
Marks, Melissa E
Harley, Vincent
Mishina, Yuji
Kingsley, David M
description Articular cartilage plays an essential role in health and mobility, but is frequently damaged or lost in millions of people that develop arthritis. The molecular mechanisms that create and maintain this thin layer of cartilage that covers the surface of bones in joint regions are poorly understood, in part because tools to manipulate gene expression specifically in this tissue have not been available. Here we use regulatory information from the mouse Gdf5 gene (a bone morphogenetic protein [BMP] family member) to develop new mouse lines that can be used to either activate or inactivate genes specifically in developing joints. Expression of Cre recombinase from Gdf5 bacterial artificial chromosome clones leads to specific activation or inactivation of floxed target genes in developing joints, including early joint interzones, adult articular cartilage, and the joint capsule. We have used this system to test the role of BMP receptor signaling in joint development. Mice with null mutations in Bmpr1a are known to die early in embryogenesis with multiple defects. However, combining a floxed Bmpr1a allele with the Gdf5-Cre driver bypasses this embryonic lethality, and leads to birth and postnatal development of mice missing the Bmpr1a gene in articular regions. Most joints in the body form normally in the absence of Bmpr1a receptor function. However, articular cartilage within the joints gradually wears away in receptor-deficient mice after birth in a process resembling human osteoarthritis. Gdf5-Cre mice provide a general system that can be used to test the role of genes in articular regions. BMP receptor signaling is required not only for early development and creation of multiple tissues, but also for ongoing maintenance of articular cartilage after birth. Genetic variation in the strength of BMP receptor signaling may be an important risk factor in human osteoarthritis, and treatments that mimic or augment BMP receptor signaling should be investigated as a possible therapeutic strategy for maintaining the health of joint linings.
doi_str_mv 10.1371/journal.pbio.0020355
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subjects Alleles
Animals
Apoptosis
Arthritis
Bone Morphogenetic Protein Receptors - metabolism
Bone Morphogenetic Protein Receptors, Type I - genetics
Bone Morphogenetic Proteins - genetics
Cartilage
Cartilage - metabolism
Cartilage - pathology
Cartilage, Articular - embryology
Cartilage, Articular - growth & development
Cartilage, Articular - metabolism
Cell Biology
Cell Proliferation
Chromosomes, Artificial, Bacterial - metabolism
Development
Gene Expression Regulation, Developmental
Genetic Variation
Genetics/Genomics/Gene Therapy
Growth Differentiation Factor 5
Inflammation
Integrases - metabolism
Joints - embryology
Kinases
Mice
Mice, Inbred C57BL
Mice, Transgenic
Molecular Sequence Data
Mus (Mouse)
Mutation
Osteoarthritis - metabolism
Phenotype
Proteins
Recombination, Genetic
Risk Factors
Signal Transduction
Synovial Membrane - embryology
Time Factors
title BMP receptor signaling is required for postnatal maintenance of articular cartilage
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