Physiological and Pharmacological Role of Lysophosphatidic Acid as Modulator in Mechanotransduction.

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  • Ohata Hisayuki
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Tanaka Ken-ichi
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Maeyama Naoto
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Ikeuchi Tadahiro
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Kamada Aya
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Yamamoto Masayuki
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University
  • Momose Kazutaka
    Department of Pharmacology, School of Pharmaceutical Sciences, Showa University

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The mechanotransduction mechanism is believed to play an important role in maintenance of cellular homeostasis in a wide variety of cell types. In particular, the mechanotransduction system in vascular endothelial cells may be an essential mechanism for local hemodynamic control. Elevations in intracellular free Ca2+ concentration ([Ca2+]i) are an important signal in the initial step of mechanotransduction and mechanosensitive (MS) cation channels are thought to be a putative pathway; however, the molecular mechanisms remain unclear. We found that lysophosphatidic acid (LPA), a bioactive phospholipid, sensitizes the response of [Ca2+]i to mechanical stress in several cell types. Employing real-time confocal microscopy, local increases in [Ca2+]i in several regions within the cell during application of mechanical stress were clearly visualized in bovine lens epithelial and endothelial cells in the presence of LPA. The phenomenon was termed “Ca2+ spots”. Pharmacological studies revealed that Ca2+ spots arise due to influx through MS channels. In this report, our data indicating the possible significance of LPA as an endogenous factor involved in regulation of mechanotransduction is reviewed. Furthermore, our findings suggest that the Ca2+ spot is a novel phenomenon occurring as an elementary Ca2+-influx event through MS channels directly coupled with the initial step in mechanotransduction.

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  • Jpn.J.Pharmacol.

    Jpn.J.Pharmacol. 87 (3), 171-176, 2001

    公益社団法人 日本薬理学会

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