RGD Reference Report - Microtubule-dependent redistribution of the type-1 inositol 1,4,5-trisphosphate receptor in A7r5 smooth muscle cells. - Rat Genome Database

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Microtubule-dependent redistribution of the type-1 inositol 1,4,5-trisphosphate receptor in A7r5 smooth muscle cells.

Authors: Vermassen, E  Van Acker, K  Annaert, WG  Himpens, B  Callewaert, G  Missiaen, L  De Smedt, H  Parys, JB 
Citation: Vermassen E, etal., J Cell Sci. 2003 Apr 1;116(Pt 7):1269-77.
RGD ID: 7175278
Pubmed: PMID:12615969   (View Abstract at PubMed)

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.

Gene Ontology Annotations    Click to see Annotation Detail View

Cellular Component
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
perinuclear region of cytoplasm  IDA 7175278 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Itpr1  (inositol 1,4,5-trisphosphate receptor, type 1)

Objects referenced in this article
Gene Itpr3 inositol 1,4,5-trisphosphate receptor, type 3 Rattus norvegicus

Additional Information