Title: Microtubule-dependent redistribution of the type-1 inositol 1,4,5-trisphosphate receptor in A7r5 smooth muscle cells
Authors: Vermassen, Elke ×
Van Acker, Kristel
Annaert, Wim
Himpens, Bernard
Callewaert, Geert
Missiaen, Ludwig
De Smedt, Humbert
Parys, Jan #
Issue Date: Mar-2003
Publisher: Co. of Biologists
Series Title: Journal of Cell Science vol:116 issue:Pt 7 pages:1269-77
Abstract: In A7r5 vascular smooth muscle cells, the two expressed inositol 1,4,5-trisphosphate receptor (IP(3)R) isoforms were differentially localized. IP(3)R1 was predominantly localized in the perinuclear region, whereas IP(3)R3 was homogeneously distributed over the cytoplasm. Prolonged stimulation (1-5 hours) of cells with 3 microM arginine-vasopressin induced a redistribution of IP(3)R1 from the perinuclear region to the entire cytoplasm, whereas the localization of IP(3)R3 appeared to be unaffected. The redistribution process occurred independently of IP(3)R downregulation. No structural changes of the endoplasmic reticulum were observed, but SERCA-type Ca(2+) pumps redistributed similarly to IP(3)R1. The change in IP(3)R1 localization induced by arginine-vasopressin could be blocked by the simultaneous addition of nocodazole or taxol and depended on Ca(2+) release from intracellular stores since Ca(2+)-mobilizing agents such as thapsigargin and cyclopiazonic acid could induce the redistribution. Furthermore, various protein kinase C inhibitors could inhibit the redistribution of IP(3)R1, whereas the protein kinase C activator 1-oleoyl-2-acetyl-sn-glycerol induced the redistribution. Activation of protein kinase C also induced an outgrowth of the microtubules from the perinuclear region into the cytoplasm, similar to what was seen for the redistribution of IP(3)R1. Finally, blocking vesicular transport at the level of the intermediate compartment inhibited the redistribution. Taken together, these findings suggest a role for protein kinase C and microtubuli in the redistribution of IP(3)R1, which probably occurs via a mechanism of vesicular trafficking.
ISSN: 0021-9533
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physiology Section (-)
Toxicology and Pharmacology
Molecular Genetics Section (-)
Laboratory of Molecular and Cellular Signaling
Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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