RGD Reference Report - Phosphatidylinositol-3-kinase signaling mediates vascular smooth muscle cell expression of periostin in vivo and in vitro. - Rat Genome Database

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Phosphatidylinositol-3-kinase signaling mediates vascular smooth muscle cell expression of periostin in vivo and in vitro.

Authors: Li, G  Oparil, S  Sanders, JM  Zhang, L  Dai, M  Chen, LB  Conway, SJ  McNamara, CA  Sarembock, IJ 
Citation: Li G, etal., Atherosclerosis. 2006 Oct;188(2):292-300. Epub 2005 Dec 1.
RGD ID: 10040989
Pubmed: PMID:16325820   (View Abstract at PubMed)
PMCID: PMC2831083   (View Article at PubMed Central)
DOI: DOI:10.1016/j.atherosclerosis.2005.11.002   (Journal Full-text)

OBJECTIVE: Periostin is dramatically upregulated in rat carotid arteries after balloon injury. The objective of the present study was to understand mechanisms underlying periostin upregulation in balloon-injured rat carotid arteries and in cultured vascular smooth muscle cells (VSMCs). METHODS AND RESULTS: Periostin protein was strongly expressed at 3 days (in the medial SMCs) and 7 days (in the neointima) after injury. It was also abundantly expressed in the neointima in the late phase (at 14 and 28 days) after injury. Periostin upregulation was mediated through PI-3-kinase-dependent signaling pathway. In vivo, wortmannin, a PI-3-kinase inhibitor, inhibited balloon injury-induced Akt phosphorylation and periostin mRNA expression. In vitro, periostin mRNA expression in cultured VSMCs was stimulated by growth factors (transforming growth factor-beta1 (TGF-beta1), fibroblast growth factors (FGFs), PDGF-BB, and angiotensin II). This stimulatory effect was inhibited by the PI-3-kinase inhibitor LY294002. Further, periostin protein was mostly located in the cytoplasma of VSMCs in culture and abundantly secreted into the culture medium (CM) after stimulation with FGF-2, which significantly promoted VSMC migration in vitro. Immunodepletion of periostin from the VSMC-CM or blockade of periostin function with an anti-periostin antibody significantly reduced VSMC migration. CONCLUSIONS: Upregulation of periostin expression in rat carotid arteries following balloon injury and in cultured VSMCs after stimulation by growth factors is mediated through PI-3-kinase-dependent signaling pathway. Periostin protein secreted by VSMCs plays a significant role in regulating VSMC migration in vitro.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
cellular response to fibroblast growth factor stimulus  IEP 10040989 RGD 
positive regulation of smooth muscle cell migration  IMP 10040989 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Postn  (periostin)


Additional Information