Swelling-Activated Cl^- Current in Isolated Rabbit Articular Chondrocytes : Inhibition by Arachidonic Acid
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概要
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Articular chondrocytes play an important role in maintaining the structure and function of the cartilage in synovial joints, which is closely influenced by mechanical or osmotic stress. In the present study, isolated rabbit articular chondrocytes were examined during hyposmotic stress using the whole-cell patch-clamp method. When exposed to hyposmotic external solutions (about 5% or 32% decrease in osmolarity), isolated rabbit articular chondrocytes exhibited hyposmotic cell swelling, accompanied by the activation of the swelling-activated Cl− current (ICl,swell). ICl,swell was practically time-independent at potentials negative to +50 mV but exhibited rapid inactivation at more positive potentials. ICl,swell was potently inhibited by the Cl− channel blockers 5-nitro-2-(3-phenylpropylamino)benzoic acid, glibenclamide, and tamoxifen, but was little affected by pimozide. ICl,swell was also found to be acutely inhibited by arachidonic acid in a concentration-dependent manner with an IC50 of 0.81 μM. The maximal effect (approximately 100% block) was obtained with 10 μM arachidonic acid. The arachidonic acid metabolites prostaglandin E2, leukotriene B4, and leukotriene D4 had no appreciable effect on ICl,swell, suggesting that the inhibitory effect of arachidonic acid did not require its metabolism. The present study thus reveals the presence of ICl,swell in rabbit articular chondrocytes and ICl,swell exhibits high sensitivity to direct inhibition by arachidonic acid.
- 2009-02-20
著者
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Toyoda Futoshi
Department of Physiology, Shiga University of Medical Science
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Matsuura hiroshi
Department of Physiology, Shiga University of Medical Science
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Toyoda Futoshi
Department Of Physiology Shiga University Of Medical Science
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ISOYA Eiji
Department of Orthopaedic Surgery, Shiga University of Medical Science
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IMAI Shinji
Department of Orthopaedic Surgery, Shiga University of Medical Science
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OKUMURA Noriaki
Department of Orthopaedic Surgery, Shiga University of Medical Science
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KUMAGAI Kousuke
Department of Orthopaedic Surgery, Shiga University of Medical Science
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OMATSU KANBE
Department of Physiology, Shiga University of Medical Science
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KUBO Mitsuhiko
Department of Orthopaedic Surgery, Shiga University of Medical Science
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MATSUSUE Yoshitaka
Department of Orthopaedic Surgery, Shiga University of Medical Science
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Matsuura Hiroshi
Department Of Applied Biological Chemistry Graduate School Of Agricultural And Life Sciences The Uni
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Isoya Eiji
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Imai Shinji
Department Of Anatomy Shiga University Of Medical Science
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Imai Shinji
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Omatsu Kanbe
Department Of Physiology Shiga University Of Medical Science
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Kubo Mitsuhiko
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Kubo Mitsuhiko
Department Of Gastroenterology Ntt-west Osaka Hospital
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Matsusue Yoshitaka
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Kumagai Kousuke
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Okumura Noriaki
Department Of Orthopaedic Surgery Shiga University Of Medical Science
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Matsuura Hiroshi
Department Of Physiology Shiga University Of Medical Science
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