ArticleProceedings of the National Academy of Sciences of the United States of America2013
Role of lubricin and boundary lubrication in the prevention of chondrocyte apoptosis.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 108 papers, 2 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
108 citing papers in PubMed, 2 syntheses or guidelines pooled it, 264 citations in OpenAlex.
- Lubricin in experimental and naturally occurring osteoarthritis: a systematic review.Osteoarthritis and cartilage · 2020Pooled it
- A Systematic Review and Guide to Mechanical Testing for Articular Cartilage Tissue Engineering.Tissue engineering. Part C, Methods · 2019Pooled it
- Two cycles of plasma rich in growth factors (PRGF-Endoret) intra-articular injections improve stiffness and activities of daily living but not pain compared to one cycle on patients with symptomatic knee osteoarthritis.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2018Trial
- Levels of Matrix-Degrading Enzymes and Lubricin in Patients With Degenerative Joint Disease Requiring Arthroplasty.Clinical and applied thrombosis/hemostasis : official journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis · 2018Trial
- Single-Cell Transcriptomic Profiling Reveals Superficial Zone Chondrocytes as a Catabolic and Senescent Focus in Osteoarthritis Cartilage.Cartilage · 2026Article
- Proteoglycan-Mimetic Bottle-Brush Polymer Brushes for Osteoarthritis Therapy: Lubrication Enhancement and Multifunctional Disease Modulation.Macromolecular rapid communications · 2026Review
- Distinct mural cells and fibroblasts drive fibrochondrogenesis in retrodiscal tissue following temporomandibular joint disc displacement.JCI insight · 2026Article
- A Biomimetic Lubricant Captures Hyaluronic Acid In Situ to Regenerate Cartilage: From Bench to Bedside.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- Lubricin Levels in Temporomandibular Joint Disorders: A Scoping Review.International journal of molecular sciences · 2026Article
- Addition of PRG4 to Optimize the Anti-Adhesive Properties of Tissue Barrier SeprafilmAnnals of biomedical engineering · 2026Article
- Sulfonated Hyaluronic Acid-Based Polymers and Hydrogels Using Thiol-Ene and Thiol-Michael Reactions.Macromolecular bioscience · 2026Article
- Disruption of proteoglycan 4 (PRG4)-CD44 signaling modulates chronic synovitis in conditionally inactivated mice.Arthritis research & therapy · 2026Article
- Article
- Tailoring human joint-on-a-chip: from biological principles, materials, to disease modeling.Materials today. Bio · 2026Review
- Lubricin in osteoarthritis: functions and therapeutic prospects.Frontiers in immunology · 2026Review
- Delayed Lubricin Injection Improves Cartilage Repair Tissue Quality in an In Vivo Rabbit Osteochondral Defect Model.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2025Article
- Disruption of Proteoglycan 4 (PRG4)-CD44 Signaling Modulates Chronic Synovitis in Conditionally Inactivated Mice.Research square · 2025Article
- Intra-Articular Administration of Recombinant Human Proteoglycan 4 (rhPRG4) as a Potential Therapy for Temporomandibular Joint Osteoarthritis: A Preclinical Histopathological Study.International journal of molecular sciences · 2025Article
- Mesenchymal progenitor-derived proteoglycan 4 regulates the transdifferentiation of chondrocytes into osteoblasts during fracture healing.Stem cells translational medicine · 2025Article
- Femur Shape Changes in Prg4-Deficient Mice: Morphological Insights Into Joint Well-Being.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2025Article
48 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 4 institutions in 1 country.
Funding
Abstract
Osteoarthritis is a complex disease involving the mechanical breakdown of articular cartilage in the presence of altered joint mechanics and chondrocyte death, but the connection between these factors is not well established. Lubricin, a mucinous glycoprotein encoded by the PRG4 gene, provides boundary lubrication in articular joints. Joint friction is elevated and accompanied by accelerated cartilage damage in humans and mice that have genetic deficiency of lubricin. Here, we investigated the relationship between coefficient of friction and chondrocyte death using ex vivo and in vitro measurements of friction and apoptosis. We observed increases in whole-joint friction and cellular apoptosis in lubricin knockout mice compared with wild-type mice. When we used an in vitro bovine explant cartilage-on-cartilage bearing system, we observed a direct correlation between coefficient of friction and chondrocyte apoptosis in the superficial layers of cartilage. In the bovine explant system, the addition of lubricin as a test lubricant significantly lowered the static coefficient of friction and number of apoptotic chondrocytes. These results demonstrate a direct connection between lubricin, boundary lubrication, and cell survival and suggest that supplementation of synovial fluid with lubricin may be an effective treatment to prevent cartilage deterioration in patients with genetic or acquired deficiency of lubricin.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.