Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage
Hyaluronic acid (HA) is used clinically to treat osteoarthritis (OA), but its pharmacological effects under hypoxic conditions remain unclear. Articular chondrocytes in patients with OA are exposed to a hypoxic environment. This study investigated whether hypoxia could potentiate the anabolic effect...
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doaj-e8a6262f09aa4a10b5e2b6779752d1142020-11-24T22:12:51ZengMDPI AGInternational Journal of Molecular Sciences1422-00672016-06-01177101310.3390/ijms17071013ijms17071013Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular CartilageShohei Ichimaru0Shuji Nakagawa1Yuji Arai2Tsunao Kishida3Masaharu Shin-Ya4Kuniaki Honjo5Shinji Tsuchida6Hiroaki Inoue7Hiroyoshi Fujiwara8Seiji Shimomura9Osam Mazda10Toshikazu Kubo11Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Sports and Para-Sports Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, JapanHyaluronic acid (HA) is used clinically to treat osteoarthritis (OA), but its pharmacological effects under hypoxic conditions remain unclear. Articular chondrocytes in patients with OA are exposed to a hypoxic environment. This study investigated whether hypoxia could potentiate the anabolic effects of exogenous HA in rat articular cartilage and whether these mechanisms involved HA receptors. HA under hypoxic conditions significantly enhanced the expression of extracellular matrix genes and proteins in explant culture, as shown by real-time reverse transcription-polymerase chain reaction (RT-PCR), Western blotting, and dimethylmethylene blue (DMMB) assays. Staining with Safranin-O and immunohistochemical staining with antibody to type II collagen were also enhanced in pellet culture. The expression of CD44 was increased by hypoxia and significantly suppressed by transfection with siRNAs targeting hypoxia-inducible factor 1 alpha (siHIF-1α). These findings indicate that hypoxia potentiates the anabolic effects of exogenous HA by a mechanism in which HIF-1α positively regulates the expression of CD44, enhancing the binding affinity for exogenous HA. The anabolic effects of exogenous HA may increase as OA progresses.http://www.mdpi.com/1422-0067/17/7/1013hypoxia-inducible factor 1 αhyaluronic acidCD44articular cartilageextracellular matrix |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shohei Ichimaru Shuji Nakagawa Yuji Arai Tsunao Kishida Masaharu Shin-Ya Kuniaki Honjo Shinji Tsuchida Hiroaki Inoue Hiroyoshi Fujiwara Seiji Shimomura Osam Mazda Toshikazu Kubo |
spellingShingle |
Shohei Ichimaru Shuji Nakagawa Yuji Arai Tsunao Kishida Masaharu Shin-Ya Kuniaki Honjo Shinji Tsuchida Hiroaki Inoue Hiroyoshi Fujiwara Seiji Shimomura Osam Mazda Toshikazu Kubo Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage International Journal of Molecular Sciences hypoxia-inducible factor 1 α hyaluronic acid CD44 articular cartilage extracellular matrix |
author_facet |
Shohei Ichimaru Shuji Nakagawa Yuji Arai Tsunao Kishida Masaharu Shin-Ya Kuniaki Honjo Shinji Tsuchida Hiroaki Inoue Hiroyoshi Fujiwara Seiji Shimomura Osam Mazda Toshikazu Kubo |
author_sort |
Shohei Ichimaru |
title |
Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage |
title_short |
Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage |
title_full |
Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage |
title_fullStr |
Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage |
title_full_unstemmed |
Hypoxia Potentiates Anabolic Effects of Exogenous Hyaluronic Acid in Rat Articular Cartilage |
title_sort |
hypoxia potentiates anabolic effects of exogenous hyaluronic acid in rat articular cartilage |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2016-06-01 |
description |
Hyaluronic acid (HA) is used clinically to treat osteoarthritis (OA), but its pharmacological effects under hypoxic conditions remain unclear. Articular chondrocytes in patients with OA are exposed to a hypoxic environment. This study investigated whether hypoxia could potentiate the anabolic effects of exogenous HA in rat articular cartilage and whether these mechanisms involved HA receptors. HA under hypoxic conditions significantly enhanced the expression of extracellular matrix genes and proteins in explant culture, as shown by real-time reverse transcription-polymerase chain reaction (RT-PCR), Western blotting, and dimethylmethylene blue (DMMB) assays. Staining with Safranin-O and immunohistochemical staining with antibody to type II collagen were also enhanced in pellet culture. The expression of CD44 was increased by hypoxia and significantly suppressed by transfection with siRNAs targeting hypoxia-inducible factor 1 alpha (siHIF-1α). These findings indicate that hypoxia potentiates the anabolic effects of exogenous HA by a mechanism in which HIF-1α positively regulates the expression of CD44, enhancing the binding affinity for exogenous HA. The anabolic effects of exogenous HA may increase as OA progresses. |
topic |
hypoxia-inducible factor 1 α hyaluronic acid CD44 articular cartilage extracellular matrix |
url |
http://www.mdpi.com/1422-0067/17/7/1013 |
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