Osteoarthritis (OA) is the most common form of arthritis and a leading cause of disability in older Americans;thus, OA poses an enormous social and economic burden in the US. OA progression is certain and since cartilage has limited regenerative capacity, total joint replacement is the only effective treatment for OA. Despite the high success rates of reducing pain and restoring mobility, joint implants have limited lifespans and surgeries present many risks, including infections. Thus, new strategies to promote articular cartilage repair and/or slow articular cartilage degeneration and disease progression are needed. The goal of this five year career development application is to establish a research program exploring the role of the protein phosphatase Phlpp1 in osteoarthritis disease (OA) progression and to explore the epigenetic mechanisms that control Phlpp1 transcription in OA. To date, the applicant's research experience focused mainly on cellular and genetic models that do not recapitulate the OA phenotype. The proposed research in this application will further advance the investigator's qualifications by providing training in surgical models of osteoarthriti and their characterization through functional assessments of pain, equilibrium partitioning of an ionic contrast agent via microcomputed tomography (EPIC-microCT), histological scoring and epigenetic/transcriptional control of gene expression. This training will provide a comprehensive skill set required for mechanistic studies detailing the ability of epigenetic factors to modulate OA progression. The completion of this project and the training received at the Mayo Clinic will prepare the Principal Investigator to be a leading contributor to the field of osteoarthritis-relatd research.

Public Health Relevance

Osteoarthritis (OA) is characterized by articular cartilage deterioration. OA is the most common form of arthritis and a leading cause of disability in older Americans. As the second most common reason for patients to visit a physician, OA poses an enormous social and economic burden in the US. Because of its limited regenerative capacity, articular cartilage is particularly challenging to repair. The best treatment options currently to repair OA damage and reduce pain are surgical interventions. Since surgeries pose many risks and implants have limited lifespans, new strategies to promote articular cartilage repair are needed. My project explores the role of a newly identified regulator of chondrocyte differentiation, Phlpp1, in the progression of osteoarthritis (OA) and during cartilage development. These studies will provide understanding of molecular events underlying the progression of OA.

National Institute of Health (NIH)
Research Scientist Development Award - Research & Training (K01)
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Arthritis and Musculoskeletal and Skin Diseases Special Grants Review Committee (AMS)
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Tyree, Bernadette
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Mayo Clinic, Rochester
United States
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