Increase of Circulating CD11b+Gr1+ cells and Recruitment into the Synovium in Osteoarthritic Mice with Hyperlipidemia
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概要
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Although recent studies suggest that hyperlipidemia is a risk factor for osteoarthritis (OA), the link between OA and hyperlipidemia is not fully understood. As the number of activated, circulating myeloid cells is increased during hyperlipidemia, we speculate that myeloid cells contribute to the pathology of OA. Here, we characterized myeloid cells in STR/Ort mice, a murine osteoarthritis model, under hyperlipidemic conditions. Ratios of myeloid cells in bone marrow, the spleen, and peripheral blood were determined by flow cytometry. To examine the influence of the hematopoietic environment, including abnormal stem cells, on the hematopoietic profile of STR/Ort mice, bone marrow transplantations were performed. The relationship between hyperlipidemia and abnormal hematopoiesis was examined by evaluating biochemical parameters and spleen weight of F2 animals (STR/Ort x C57BL/6J). In STR/Ort mice, the ratio of CD11b+Gr1+ cells in spleens and peripheral blood was increased, and CD11b+Gr1+ cells were also present in synovial tissue. Splenomegaly was observed and correlated with the ratio of CD11b+Gr1+ cells. When bone marrow from GFP-expressing mice was transplanted into STR/Ort mice, no difference in the percentage of CD11b+Gr1+ cells was observed between transplanted and age-matched STR/Ort mice. Analysis of biochemical parameters in F2 mice showed that spleen weight correlated with serum total cholesterol. These results suggest that the increase in circulating and splenic CD11b+Gr1+ cells in STR/Ort mice originates from hypercholesterolemia. Further investigation of the function of CD11b+Gr1+ cells in synovial tissue may reveal the pathology of OA in STR/Ort mice.
著者
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Satoh Masashi
Department Of Obstetrics And Gynecology Satoh Hospital
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Naruse Kouji
Department Of Orthopaedic Surgery Kitasato University School Of Medicine
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Urabe Ken
Department Of Dermatology Graduate School Of Medical Sciences Kyushu University
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Ueno Masaki
Department Of Anatomy & Cell Biology Tokyo Medical & Dental University
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Takaso Masashi
Department Of Orthopaedic Surgery Kitasato University School Of Medicine
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Onuma Kenji
Department Of Orthopaedic Surgery Kitasato University School Of Medicine
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Uchida Kentaro
Department Of Orthopaedic Surgery School Of Medicine Kitasato University
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Urabe Ken
Department of Orthopedic Surgery, Kitasato University School of Medicine, 1-15-1 Minami-ku Kitasato, Sagamihara City, Kanagawa 252-0374, Japan
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Takano Shotaro
Department of Orthopedic Surgery, Kitasato University School of Medicine, 1-15-1 Minami-ku Kitasato, Sagamihara City, Kanagawa 252-0374, Japan
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Naruse Kouji
Department of Orthopedic Surgery, Kitasato University School of Medicine, 1-15-1 Minami-ku Kitasato, Sagamihara City, Kanagawa 252-0374, Japan
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Takaso Masashi
Department of Orthopedic Surgery, Kitasato University School of Medicine, 1-15-1 Minami-ku Kitasato, Sagamihara City, Kanagawa 252-0374, Japan
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