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Sökning: WFRF:(Rakonjac M)

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  • Liepinsh, E, et al. (författare)
  • NMR structure of human coactosin-like protein
  • 2004
  • Ingår i: Journal of biomolecular NMR. - : Springer Science and Business Media LLC. - 0925-2738 .- 1573-5001. ; 30:3, s. 353-356
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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  • Woolcott, Orison O, et al. (författare)
  • Arachidonic acid is a physiological activator of the ryanodine receptor in pancreatic beta-cells.
  • 2006
  • Ingår i: Cell Calcium. - : Elsevier BV. - 0143-4160 .- 1532-1991. ; 39:6, s. 529-37
  • Tidskriftsartikel (refereegranskat)abstract
    • Pancreatic beta-cells have ryanodine receptors but little is known about their physiological regulation. Previous studies have shown that arachidonic acid releases Ca(2+) from intracellular stores in beta-cells but the identity of the channels involved in the Ca(2+) release has not been elucidated. We studied the mechanism by which arachidonic acid induces Ca(2+) concentration changes in pancreatic beta-cells. Cytosolic free Ca(2+) concentration was measured in fura-2-loaded INS-1E cells and in primary beta-cells from Wistar rats. The increase of cytosolic Ca(2+) concentration induced by arachidonic acid (150microM) was due to both Ca(2+) release from intracellular stores and influx of Ca(2+) from extracellular medium. 5,8,11,14-Eicosatetraynoic acid, a non-metabolizable analogue of arachidonic acid, mimicked the effect of arachidonic acid, indicating that arachidonic acid itself mediated Ca(2+) increase. The Ca(2+) release induced by arachidonic acid was from the endoplasmic reticulum since it was blocked by thapsigargin. 2-Aminoethyl diphenylborinate (50microM), which is known to inhibit 1,4,5-inositol-triphosphate-receptors, did not block Ca(2+) release by arachidonic acid. However, ryanodine (100microM), a blocker of ryanodine receptors, abolished the effect of arachidonic acid on Ca(2+) release in both types of cells. These observations indicate that arachidonic acid is a physiological activator of ryanodine receptors in beta-cells.
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