2007
DOI: 10.1074/jbc.m703914200
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Rapamycin Promotes Vascular Smooth Muscle Cell Differentiation through Insulin Receptor Substrate-1/Phosphatidylinositol 3-Kinase/Akt2 Feedback Signaling

Abstract: The phenotypic plasticity of mature vascular smooth muscle cells (VSMCs) facilitates angiogenesis and wound healing, but VSCM dedifferentiation also contributes to vascular pathologies such as intimal hyperplasia. Insulin/insulin-like growth factor I (IGF-I) is unique among growth factors in promoting VSMC differentiation via preferential activation of phosphatidylinositol 3-kinase (PI3K) and Akt. We have previously reported that rapamycin promotes VSMC differentiation by inhibiting the mammalian target of rap… Show more

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Cited by 130 publications
(185 citation statements)
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“…Because differentiated VSMCs in blood vessels are maintained in a non-proliferative state, expression of IRS-1 may be one of the important determinants that allow normal protein synthesis and hypertrophic responses to IGF-I and insulin while functioning simultaneously to inhibit cell replication. In contrast, transition to the dedifferentiated phenotype could possibly require a major decrease in IRS-1 in order to permit MAPK pathway activation (17,73). This conclusion is supported by the results of this study, wherein IRS-1 silencing increased basal IGF-IR phosphorylation, which in turn, in the absence of IRS-1 binding, had increased access to SHPS-1, thereby augmenting basal SHPS-1 phosphorylation.…”
Section: Discussionsupporting
confidence: 79%
See 1 more Smart Citation
“…Because differentiated VSMCs in blood vessels are maintained in a non-proliferative state, expression of IRS-1 may be one of the important determinants that allow normal protein synthesis and hypertrophic responses to IGF-I and insulin while functioning simultaneously to inhibit cell replication. In contrast, transition to the dedifferentiated phenotype could possibly require a major decrease in IRS-1 in order to permit MAPK pathway activation (17,73). This conclusion is supported by the results of this study, wherein IRS-1 silencing increased basal IGF-IR phosphorylation, which in turn, in the absence of IRS-1 binding, had increased access to SHPS-1, thereby augmenting basal SHPS-1 phosphorylation.…”
Section: Discussionsupporting
confidence: 79%
“…IRS-1 has been linked to many of the insulinor IGF-I-mediated biological responses, including changes in cell size, mitogenesis, and cell migration (14 -16). IGF-Istimulated IGF-IR has been shown to bind to IRS-1 and phosphorylate it in several cell types, including vascular smooth muscle cells (17,18).…”
mentioning
confidence: 99%
“…S3). Interestingly, a similar effect was seen in a study using vascular smooth muscle cells (51). However, the precise definition of the mechanism by which rapamycin increases serum IGF bioactivity requires additional investigation and is an active area of research.…”
Section: Discussionmentioning
confidence: 55%
“…1C). The MDSC conversion into SMCs was assessed for 4 weeks in DMEM-2.5% FBS and 20 n M rapamycin to enhance the contractile phenotype [38] by another SMC marker that is not expressed in myofibroblasts, namely calponin. In this case, the MDSCs were labelled with DAPI and calponin identified by immunodetection with Texas Red fluorescence, observing the positive cells in magenta colour in the overlay of the blue and red filters (Fig.…”
Section: Resultsmentioning
confidence: 99%