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FEBS Lett. 2005 May 9;579(12):2597-603. Epub 2005 Apr 12.

Distribution profile of inositol 1,4,5-trisphosphate receptor isoforms in adrenal chromaffin cells.

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  • 1National Creative Research Initiative Center for Secretory Granule Research, and Department of Biochemistry, Inha University College of Medicine, Jung Gu, Incheon, Republic of Korea.


Given the importance of inositol 1,4,5-trisphosphate receptor (IP(3)R)/Ca(2+) channels in the control of intracellular Ca(2+) concentrations, we determined the relative concentrations of the IP(3)R isoforms in subcellular organelles, based on serially sectioned electron micrographs. The endoplasmic reticulum (ER) was estimated to contain 15-20% of each of the three IP(3)R isoforms while secretory granules contained 58-69%. The nucleus contained approximately 15% each of IP(3)R-1 and -2, but 25% of IP(3)R-3, whereas the plasma membrane contained approximately 1% or less of each. These suggested that secretory granules, the nucleus and ER are at the center of IP(3)-dependent intracellular Ca(2+) control mechanisms in chromaffin cells.

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