Organelles Containing Inositol Trisphosphate Receptor Type 2 in Adrenal Medullary Cells

  • Endo Yutaka
    Department of Cell and System Physiology, University of Occupational and Environmental Health School of Medicine
  • Harada Keita
    Department of Cell and System Physiology, University of Occupational and Environmental Health School of Medicine
  • Fujishiro Naoji
    Department of Cell and System Physiology, University of Occupational and Environmental Health School of Medicine
  • Funahashi Hisasachi
    Department of Anatomy, Showa University School of Medicine
  • Shioda Seiji
    Department of Anatomy, Showa University School of Medicine
  • Prestwich Glenn D.
    Department of Medical Chemistry, University of Utah
  • Mikoshiba Katsuhiko
    Division of Molecular Neurobiology, The Institute of Medical Science, The University of Tokyo
  • Inoue Masumi
    Department of Cell and System Physiology, University of Occupational and Environmental Health School of Medicine

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  • Organelles Containing Inositol Trisphosphate Receptor Type 2 in Adrenal Medullaly Cells

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Abstract

To identify which organelles contained inositol trisphosphate (InsP3) receptor type 2 (InsP3R2) in adrenal medullary (AM) cells, immunocytochemical and biochemical studies were performed on AM cells of several species. InsP3R2-like immunoreactive materials produced by two different anti-InsP3R2 antibodies (Abs) (Chemicon and Sigma) were distributed in rat AM cells in agreement with BODIPY-FL-InsP3 binding sites. For two other Abs (KM1083 and Santa Cruz), some of the anti-InsP3R2 immunoreactive materials were stained with an anti-dopamine-β-hydroxylase Ab, but not by BODIPY-FL-InsP3. BODIPY-FL-thapsigargin binding sites were consistent with a distribution of the endoplasmic reticulum (ER) identified by an anti-calnexin Ab, and a prior application of thapsigargin significantly eliminated BODIPY-FL-thapsigargin bindings, suggesting that BODIPY-FL-thapsigargin bindings were mediated by thapsigargin, but not the fluorescence molecule. The anti-InsP3R2 Ab that produced stainings consistent with BODIPY-FL-InsP3 bindings recognized a protein with about 250 kDa. A fractional analysis of bovine adrenal medullae revealed that the 250 kDa InsP3R2 was detected in a crude membrane fraction, but not in a secretory granule fraction. The results suggest that the InsP3R2 was present in the ER, but not in secretory granules in AM cells.<br>

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