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Advanced osteoarthritis in humans is associated with altered collagen VI expression and upregulation of ER-stress markers Grp78 and bag-1.

To test the hypothesis that a perturbation of endoplasmic reticulum (ER) function is involved in the pathogenesis of osteoarthritis (OA), articular cartilage was isolated from non-OA patients secondary to resection of osteo- or chondrosarcomas.…

Characterization of ex vivo-generated bovine and human cartilage by immunohistochemical, biochemical, and magnetic resonance imaging analyses.

Osteoarthritis (OA) is a prevalent age-associated disease involving altered chondrocyte homeostasis and cartilage degeneration. The avascular nature of cartilage and the altered chondrocyte phenotype characteristic of OA severely limit the capacity…

Bcl-2 positively regulates Sox9-dependent chondrocyte gene expression by suppressing the MEK-ERK1/2 signaling pathway.

Bcl-2 is an anti-apoptotic protein that has recently been shown to regulate other cellular functions. We previously reported that Bcl-2 regulates chondrocyte matrix gene expression, independent of its anti-apoptotic function. Here, we further…

Tags: *Gene Expression Regulation, 2005, Adenoviridae/genetics, Animals, Apoptosis, beta-Galactosidase/metabolism, Blotting, Butadienes/pharmacology, Caspase Inhibitors, Cell Differentiation, Cell Line, Chondrocytes/*metabolism, Collagen Type II/metabolism, Department of Anatomy & Neurobiology, Down-Regulation, Enzyme Inhibitors/pharmacology, Fibroblasts/metabolism, Fluorescence, Genetic, High Mobility Group Proteins/*metabolism, Horton Walter E Jr, Lac Operon, Luciferases/metabolism, MAP Kinase Kinase Kinases/*metabolism, McBurney Denise, Messenger/metabolism, Microscopy, Mitogen-Activated Protein Kinase 1/*metabolism, Mitogen-Activated Protein Kinase 3/*metabolism, NEOMED College of Medicine, NF-kappa B/metabolism, Nitriles/pharmacology, Phenotype, Phosphorylation, Promoter Regions, Protein Kinase C-alpha, Protein Kinase C/antagonists & inhibitors, Proteoglycans/metabolism, Proto-Oncogene Proteins c-bcl-2/*metabolism, Rats, Reverse Transcriptase Polymerase Chain Reaction, RNA, Signal Transduction, Small Interfering/metabolism, SOX9 Transcription Factor, Sprague-Dawley, The Journal of biological chemistry, Time Factors, Transcription, Transcription Factors/*metabolism, Transfection, Western, Yagi Rieko

Multiple signals induce endoplasmic reticulum stress in both primary and immortalized chondrocytes resulting in loss of differentiation, impaired cell growth, and apoptosis.

The endoplasmic reticulum is the site of synthesis and folding of secretory proteins and is sensitive to changes in the internal and external environment of the cell. Both physiological and pathological conditions may perturb the function of the…

Intrajoint comparisons of gene expression patterns in human osteoarthritis suggest a change in chondrocyte phenotype.

Osteoarthritis (OA) is a degenerative cartilage disease with varying degrees of severity within a given joint. The purpose of this study was to define a sampling procedure for comparing human minimal and advanced OA cartilage in the same patient and…

The presence of extracellular matrix alters the chondrocyte response to endoplasmic reticulum stress.

The objective of this study was to test the hypothesis that extracellular matrix (ECM) would alter the endoplasmic reticulum (ER) stress response of chondrocytes. Chondrocytes were isolated from calf knees and maintained in monolayer culture or…

A novel role for Bcl-2 associated-athanogene-1 (Bag-1) in regulation of the endoplasmic reticulum stress response in mammalian chondrocytes.

BAG-1 (Bcl-2 associated athanogene-1) is a multifunctional protein, linking cell proliferation, cell death, protein folding, and cell stress. In vivo, BAG-1 is expressed in growth plate and articular cartilage, and the expression of BAG-1 is…

Coordinate down-regulation of cartilage matrix gene expression in Bcl-2 deficient chondrocytes is associated with decreased SOX9 expression and decreased mRNA stability.

The anti-apoptotic protein Bcl-2 has been shown to function in roles unrelated to apoptosis in a variety of cell types. We have previously reported that loss of Bcl-2 expression alters chondrocyte morphology and modulates aggrecan expression via an…

Age-related expression patterns of Bag-1 and Bcl-2 in growth plate and articular chondrocytes.

Aging cartilage displays increased chondrocyte apoptosis and decreased responsiveness of chondrocytes to growth factors. The molecular mechanisms responsible for these changes have not been identified. Bag-1 is a Bcl-2-binding protein that promotes…

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