• Title/Summary/Keyword: Cytosolic

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Two Types of Vanadate-sensitive Microsomal ATPases in Tracheal Epithelial Cells

  • Jung Sakong;Kim, Young-Kee
    • Proceedings of the Korean Biophysical Society Conference
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    • 1997.07a
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    • pp.22-22
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    • 1997
  • The physiological activity of tracheal epithelial cells is closely related with the ionic conditions of cytosol, specially the concentration of cytosolic Ca$\^$2+/. We have prepared microsomes in these cells and the molecular mechanisms of ionic regulations were investigated.(omitted)

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D609, an Inhibitor of Phosphatidylcholine-specific Phospholipase C, Inhibits Group IV Cytosolic Phospholipase A2

  • Kang, Mi Sun;Jung, Sung Yun;Jung, Kwang Mook;Kim, Seok Kyun;Ahn, Kyong Hoon;Kim, Dae Kyong
    • Molecules and Cells
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    • v.26 no.5
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    • pp.481-485
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    • 2008
  • As an inhibitor of phosphatidylcholine-specific phospholipase C (PC-PLC), D609 has been widely used to explain the role of PC-PLC in various signal transduction pathways. This study shows that D609 inhibits group IV cytosolic phospholipase $A_2$ ($cPLA_2$), but neither secretory $PLA_2$ nor a $Ca^{2+}$-dependent $PLA_2$. Dixon plot analysis shows a mixed pattern of noncompetitive and uncompetitive inhibition with $K_i=86.25{\mu}M$ for the $cPLA_2$ purified from bovine spleen. D609 also time- and dose-dependently reduces the release of arachidonic acid from a $Ca^{2+}$- ionophore A23187-stimulated MDCK cells. In the AA release experiment, $IC_{50}$ of D609 was ${\sim375}{\mu}M$, suggesting that this reagent may not enter the cells easily. The present study indicates that the inhibitory effects of D609 on various cellular responses may be partially attributable to the inhibition of $cPLA_2$.