Stimulation of Proteoglycan Release from Cultured Vascular Endothelial Cell Layers by Sodium Spirulan

  • Kaji Toshiyuki
    Department of Environmental Health, Faculty of Pharmaceutical Sciences, Hokuriku University
  • Shimada Satomi
    Department of Environmental Health, Faculty of Pharmaceutical Sciences, Hokuriku University
  • Yamamoto Chika
    Department of Environmental Health, Faculty of Pharmaceutical Sciences, Hokuriku University
  • Fujiwara Yasuyuki
    Department of Environmental Health, Faculty of Pharmaceutical Sciences, Hokuriku University
  • Lee Jung-Bum
    Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University
  • Hayashi Toshimitsu
    Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University

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Our previous study suggested that sodium spirulan (Na-SP) stimulated the release of proteoglycans from cultured vascular endothelial cell layers. In the present study, we characterized the stimulatory effect of Na-SP on endothelial proteoglycan release from the viewpoint of the Na-SP structure. The following results were obtained: Na-SP is a potent stimulator of endothelial proteoglycan release. The stimulatory effect of Na-SP disappears with desulfation or removal of sodium ion. Depolymerized Na-SPs (Mr ∼14700 or greater) also exhibits stimulatory effects as does Na-SP (Mr ∼220000). The stimulation occurs more potently in endothelial cells than in vascular smooth muscle cells. Therefore it is suggested that the stimulatory effect of Na-SP on proteoglycan release requires both the sulfate group and sodium ion, and the effect is achieved by an active structure in the molecule which interacts particularly with the endothelial cell extracellular matrix. <br>

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