MicroRNA transcriptional profiling in serum-starved human aortic smooth muscle cells
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE19544 | GEO | 2009/12/25
SECONDARY ACCESSION(S): PRJNA122325
REPOSITORIES: GEO
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Project description:We sought to identify microRNAs that were differentially regulated in cultured primary human aortic smooth muscle cells (SMCs) when exposed to growth arrest via serum starvation over two time points - 48 hours and 72 hours, when compared with serum-fed cells. This treatment leads to increased expression of SMC differentiation markers such as ACTA2, MYH11 and TAGLN. We identified 31 significantly regulated miRNA candidates during this process, 28 rising and 3 falling. Human aortic SMCs (AoSMCs) were propagated in growth media. Control plates were harvested, and the remaining plates were serum starved for 48 (SS48) or 72 hours (SS72) in serum-free basal media. Several arrays were excluded from final analysis after QC, resulting in a final set of 10.
2009-12-25 | E-GEOD-19544 | biostudies-arrayexpress
Project description:All current smooth muscle cell (SMC) restricted Cre mice recombine floxed alleles in vascular and visceral SMCs. We generated a tamoxifen-inducible CreERT2 mouse, Itga8-CreERT2, and compared its activity to the widely used Myh11-CreERT2 mouse. Both CreERT2 mice showed similar activity in vascular SMCs; however, Itga8-CreERT2 displayed low activity in visceral SMC-containing tissues (e.g., intestine). Myh11-CreERT2 (but not Itga8-CreERT2) mice exhibited high levels of CreERT2 protein, tamoxifen-independent activity, and an altered transcriptome. Whereas Myh11-CreERT2-mediated knockout of Srf resulted in a lethal intestinal phenotype, loss of Srf with Itga8-CreERT2 (SrfItga8) revealed viable mice with attenuated vascular SMC contractile gene expression, but no evidence of intestinal pathology. Male and female SrfItga8 mice presented with vascular contractile incompetence; however, only male SrfItga8 mice showed systemic changes in blood pressure. These results establish the Itga8-CreERT2 mouse as an alternative to existing SMC Cre strains where gene loss may result in visceral myopathies that obfuscate accurate phenotyping in vascular SMCs.
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Project description:Unlike other terminally differentiated cell types, vascular SMCs display remarkable phenotypic plasticity. The adult, differentiated state is traditionally defined by expression of well-characterized SMC contractile genes. Extracellular cues, however, can induce contractile SMCs to remodel toward a synthetic state characterized by a spectrum of proliferative, migratory, and inflammatory phenotypes. We used whole-genome expression arrays to to identify genes associated with SMC phenotypic modulation. Experiment Overall Design: Rat aortic SMCs were serum-starved for 72 hours and subsequently treated with either PDGF-BB or its respective vehicle (n=2). RNA samples were hybridzed to Affymetrix arrays with the intent to identify early genes associated with SMC phenotypic modulation.
2009-12-02 | E-GEOD-19106 | biostudies-arrayexpress
Project description:Coronary artery disease is the leading cause of mortality in women. Abnormal growth of smooth muscle cells and endothelial damage contributes to the thickening of the blood vessels and vascular occlusion. Estradiol prevents vascular remodleing by promoting EC growth and inhibiting SMC growth. Recent studies suggest that circulating (bone marrow derived) progenitor cells also contribute to the vascular remodeling process. Whether estradiol could, in part, induce its protective actions by inhibiting P-SMC growth remains unknown. In this study, progenitor smooth muscle cells (P-SMCs) and endothelial (P-ECs) grown from CD34+ progenitor cells (PC) magnetically separated from human cord blood derived mononuclear cells. P-SMC and P-EC cell colonies were grown and characterized for SMC and EC markers. Cultured cells were further used to assess the effects of 17β-estradiol (E2; 10nM) on their growth and gene expression. Briefly, P-SMCs or P-ECs were treated with or without 10 nM E2 for 0, 4 or 30 hours in DMEM-F12 supplemented with 2.5% FCS (steroid-free; SF). Subsequently, total RNA was extracted using RNeasy Mini Kit (QIAGEN) processed for gene analysis. Treatment of P-SMCs with E2 inhibited 2.5% SF-serum -induced growth (DNA synthesis and cell number), whereas, E2 induced cell growth in P-ECs. The growth effects of E2 in P-SMCs and P-ECs were mimicked by ER-α agonist and blocked by ER-α antagonist. The differential effects of E2 on P-SMC and P-EC growth were also reflected in ERK1/2 and Akt phosphorylation and in positive and negative regulators of cell cycle. Gene analysis revealed that P-SMCs expressed SMC alpha actin (ACTA2) where as P-ECs expressed CD34, FLT1 and vWF, confirming the differentiation of progenitor cells to SMCs and ECs. Treatment with E2 for 30 hours regulated 1791 in P-SMCs and 220 in P-ECs, with 36 that were common. Volcano analysis showed that treatment with E2 for 30 hours differentially expressed multiple genes, importantly, estradiol significantly upregulated antimitogenic pathways and downregulated proproliferative pathways in P-SMC and P-ECs, respectively. Contrasting effects of E2 were also observed in multiple ingenuity canonical pathways that were up or downregulated in P-SMCs and P-ECs. Findings from both growth and gene expression studies provide evidence that etradiol may induce its vascular protective actions by inhibiting P-SMC activity and improving P-EC activity. Interestingly, in perpheral blood estradiol decreasd the number of c-kit+ cells and increased CD34+ cells. Since these cells evolve into SMCs and ECs respectively, our findings provide evidence that estradiol may induce its anti-occlusive actions by differentially regulating P-SMC and P-EC activity and numbers.
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Project description:Cardiovascular disease is the leading cause of death in developed countries and there is compelling evidence that the majority of these fatalities are secondary to rupture of unstable atherosclerotic plaques. However, the mechanisms that control plaque stability are poorly understood, although it is widely believed that plaques having a decreased ratio of cells positive for smooth muscle cell (SMC) markers such as ACTA2 relative to macrophage markers are more likely to rupture. Herein we employMyh11-CreERT2 ROSA floxed STOP eYFP Apoe-/- mice to trace SMC lineage and show that traditional methods for detecting SMCs based on immunostaining for SMC markers like ACTA2 are unable to detect 82% of SMC-derived cells within advanced atherosclerotic lesions. Moreover, we show that these SMC-derived cells within advanced lesions exhibit multiple phenotypes including activation of multiple markers of macrophages, mesenchymal stem cells (MSC), and myofibroblasts (MF). Importantly, we show that SMC-derived macrophage like cells are phagocytic based on electron microscope YFP immunolabeling. In addition, results of single cell epigenetic assays developed in our lab shows that nearly 20% of macrophage-like cells within human lesions are of SMC not myeloid origin. These phenotypic transitions appear to be critical in lesion pathogenesis, in that we show that SMC-specific conditional knockout (KO) of the pluripotency factor, Krüppel-like factor 4 (KLF4), resulted in marked reductions in lesion size, increases in multiple indices of plaque stability, and reduced numbers of SMC-derived MSC- and macrophage-like cells. Finally, we show that cholesterol loading of cultured SMC is associated with activation of multiple markers of macrophages and MSC, secretion of pro-inflammatory cytokines, and increased phagocytosis, all of which are Klf4 dependent. Taken together, results indicate that the contribution of SMCs within atherosclerotic plaques has been greatly underestimated, and that loss of Klf4 within SMC result in major changes in SMC phenotype and function that play a major role in lesion pathogenesis. Examination of KLF4 transcription factor in an atherosclerosis setting
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Project description:Derivation of induced smooth muscle cells (iSMC) through direct transdifferentiation of a convenient and expandable primary cell source would open a wide range of prospects for their use in tissue engineering, drug testing, and disease modeling. Hypothesizing that MYOCD as a master regulator of smooth muscle gene expression would facilitate the generation of iSMC, we studied the conversion of human endothelial progenitor cells (EPC) into iSMC through the induced expression of by over-expression of MYOCD. A significant cytoskeletal rearrangement of the EPC resembling that of mesenchymal cells occurred within 3 days post initiation of MYOCD expression. This transition was associated with a downregulation of endothelial cell surface markers (CD31, CD105) as determined by flow cytometry. By day 7, iSMC derivation was evident with a significant upregulation of smooth muscle markers ACTA2, MYH11, TAGLN, and downregulation of CD31 and CDH5 as determined by gene expression analysis. Immunofluorescence revealed expression of MYH11 and ACTA2 and absence of endothelial markers VWF and CD31. By two weeks, microarray gene expression analysis demonstrated a significant similarity between iSMC and umbilical artery SMC (UASMC). The iSMC continued to develop toward the SMC lineage after four weeks of MYOCD induced expression. Microarray gene expression analysis showed an upregulation of molecular pathways associated with smooth muscle contraction and cytoskeletal reorganization in iSMC. Calcium transients were detected in iSMC when stimulated with phenylephrine but not in EPC. Contractility of iSMC was also higher than that of EPC as determined by traction force microscopy. Tissue-engineered blood vessels constructed using iSMC showed functionality with respect to flow- and drug- mediated vasodilation and vasoconstriction. We used microarrays to detail the global programme of gene expression underlying the transdifferentiation of endothelial progenitor cells into smooth muscle cells via the transient induced expression of the transcriptional co factor MYOCD
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Project description:The LIM-only protein FHL2 is expressed in SMCs and inhibits SMC-rich lesion formation. However, the underlying mechanism behind FHL2's action in SMCs has been only partially resolved. To further elucidate the role of FHL2 in SMCs we compared the transcriptome of cultured SMCs derived from wild-type (WT) and FHL2-knockout (KO) mice. Comparison of gene expression in aortic smooth muscle cells (SMCs) isolated from WT and FHL2-knockout (FHL2-KO) mice. SMCs isolated from three mouse aortas were pooled (Kurakula et al, PLOS One, 2014). Both for WT and FHL-KO mice three batches of SMCs (derived from 9 mice) were cultured. The SMCs were grown to confluency and maintained in serum-free medium for 48 hrs before harvest. Subsequently, RNA was isolated for gene expression profiling.
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