Aging aggravates aortic aneurysm and dissection via miR-1204-MYLK signaling axis
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE255157 | GEO | 2024/04/02
REPOSITORIES: GEO
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Project description:The mechanism by which aging induces aortic aneurysm and dissection (AAD) remains unclear. A total of 430 subjects were recruited for screening of differentially expressed plasma microRNAs. We found that miR-1204 was significantly increased in both plasma and aorta of elder patients with AAD, and was positively correlated with age. Cell senescence induced the expression of miR-1204 through p53 interaction with plasmacytoma variant translocation 1, and miR-1204 induced vascular smooth muscle cell (VSMC) senescence to form a positive feedback loop. miR-1204 aggravated angiotensin II-induced AAD formation, and inhibition of miR-1204 attenuated β-aminopropionitrile monofumarate-induced AAD formation. Mechanistically, miR-1204 directly targeted myosin light chain kinase (MYLK) to promote VSMCs to acquire senescence-associated secretory phenotype (SASP) and lose their contractile phenotype. Overexpression of MYLK reversed miR-1204-induced VSMC senescence, SASP and contractile phenotype changes, and the decrease of transforming growth factor-β signaling pathway. Our findings suggest aging aggravates AAD via miR-1204-MYLK signaling axis.
2024-04-01 | PXD048658 | Pride
Project description:The mechanism by which aging induces aortic aneurysm and dissection (AAD) remains unclear. A total of 430 subjects were recruited for screening of differentially expressed plasma microRNAs. We found that miR-1204 was significantly increased in both plasma and aorta of elder patients with AAD, and was positively correlated with age. Cell senescence induced the expression of miR-1204 through p53 interaction with plasmacytoma variant translocation 1, and miR-1204 induced vascular smooth muscle cell (VSMC) senescence to form a positive feedback loop. miR-1204 aggravated angiotensin II-induced AAD formation, and inhibition of miR-1204 attenuated β-aminopropionitrile monofumarate-induced AAD formation. Mechanistically, miR-1204 directly targeted myosin light chain kinase (MYLK) to promote VSMCs to acquire senescence-associated secretory phenotype (SASP) and lose their contractile phenotype. Overexpression of MYLK reversed miR-1204-induced VSMC senescence, SASP and contractile phenotype changes, and the decrease of transforming growth factor-β signaling pathway. Our findings suggest aging aggravates AAD via 75 miR-1204-MYLK signaling axis.
2024-04-02 | GSE253747 | GEO
Project description:Vascular smooth muscle cell (VSMC) phenotypic switching is widely recognized as a key mechanism responsible for the pathogenesis of several aortic diseases such as aortic aneurysm. Cellular communication network factor 2 (CCN2), often upregulated in human pathologies and animal disease models, exerts a myriad of context-dependent biological functions. However, current understanding of the role of SMC-CCN2 in SMC phenotypic switching and its function in the pathology of abdominal aortic aneurysm (AAA) is lacking. Here we report the effect of SMC-restricted CCN2 deficiency of hypercholesterolemic mice on gene expression in infrarenal aorta with or without angiotensin II (Ang II)-infusion.
2023-03-02 | GSE221399 | GEO
Project description:Abdominal aortic aneurysm (AAA) is usually asymptomatic until life-threatening complications occur, predominantly involving aortic rupture. Currently, no drug-based treatments are available, primarily due to limited understanding of AAA pathogenesis. The transcriptional regulator PR domain–containing protein 16 (PRDM16) is highly expressed in the aorta, but its functions in the aorta are largely unknown. By RNA-seq analysis, we found that vascular smooth muscle cell–specific (VSMC-specific) Prdm16-knockout (Prdm16SMKO) mice already showed extensive changes in the expression of genes associated with extracellular matrix (ECM) remodeling and inflammation in the abdominal aorta under normal housing conditions without any pathological stimuli. Human AAA lesions displayed lower PRDM16 expression. Periadventitial elastase application to the suprarenal region of the abdominal aorta aggravated AAA formation in Prdm16SMKO mice. During AAA development, VSMCs undergo apoptosis because of both intrinsic and environmental changes, including inflammation and ECM remodeling. Prdm16 deficiency promoted inflammation and apoptosis in VSMCs. A disintegrin and metalloproteinase 12 (ADAM12) is a gelatinase that can degrade various ECMs. We found that ADAM12 is a target of transcriptional repression by PRDM16. Adam12 knockdown reversed VSMC apoptosis induced by Prdm16 deficiency. Our study demonstrated that PRDM16 deficiency in VSMCs promoted ADAM12 expression and aggravates AAA formation, which may provide potential targets for AAA treatment.
2023-06-08 | GSE222440 | GEO
Project description:Myocardin (Myocd) plays an important role in the maintenance and homeostasis of the vasculature. The loss of Myocd results in vascular smooth muscle cell (VSMC) phenotypic transition and thoracic aortic aneurysms and dissections (TAADs) by downregulating VSMC contractile genes. VSMC phenotypic transition plays a key role in the formation of abdominal aortic aneurysms and dissections (AAADs). However, little is known about the role of Myocd in AAAD. The effect of Myocd on AAA formation was proven in an angiotensin II (Ang II)-induced AAD model. Myocd overexpression or knockdown was achieved by the injection of the corresponding adeno-associated virus serotype 9 (AAV9) through the tail vein. The knockdown of Myocd in C57BL/6J mice treated with angiotensin II promoted the formation of AAAD, as demonstrated by increases in the maximal aortic diameter, vascular inflammation and elastin degradation relative to the control group, while Myocd-overexpressing ApoE-/- mice infused with Ang II were less likely to develop AAAD. Mechanistically, Myocd deficiency significantly repressed VSMC marker gene expression. In addition, qPCR results showed that Myocd knockdown promoted the expression of lncRNAs, which showed increased levels in human AAD tissues. Our results indicated the pivotal role of Myocd in protecting against AAAD formation.
2024-10-25 | GSE180990 | GEO
Project description:BACKGROUND: Thoracic aortic dissection (TAD) and abdominal aortic aneurysm (AAA) are fatal cardiovascular diseases with a high mortality rate in rupture events, closely related to vascular smooth muscle cell (VSMC) transformation from contractile to synthetic type and extracellular matrix degradation. NFATc3 in macrophages has recently been revealed as an atherosclerosis and foam cell formation negative regulator. However, the role of NFATc3 in aortic aneurysm and dissection (AAD) remains unknown. Therefore, we aimed to investigate the role of VSMC in NFATc3 in developing AAD and establishing NFATc3 as a novel target to treat AAD. METHODS: NFATc3 expression was measured in human and mouse aortic dissection and aneurysm samples. To investigate the role of VSMC-NFATc3 in AAD, we generated VSMC-specific NFATc3 knockout and knockin mice from three different murine AAD models, including proprotein convertase subtilisin/kexin type 9/ AngII (angiotensin II), β-aminopropionitrile (BAPN)/AngII models and BAPN models. The molecular mechanisms underlying NFATc3 function were investigated using RNA-seq analysis, mass spectrometry analysis, gelatin zymography, a luciferase reporter assay ChIP-qPCR, nuclear run-on assay, polyribosome profiling, coimmunoprecipitation, and mammalian 2-hybrid assay. RESULTS: We found that cytoplasmic and nuclear NFATc3 levels are elevated in human and mouse aortic dissection aneurysms. VSMC-specific NFATc3 deletion in mice reduced TAD and AAA progression, whereas VSMC-specific NFATc3 overexpression mice exhibited the opposite phenotype. VSMC-NFATc3 aggravated AAD independently of blood pressure regulation. VSMC-specific NFATc3 deletion reduces extracellular matrix degradation and maintains VSMC contractile phenotype. Mechanistically, nuclear NFATc3 specifically targeted and transcriptionally up-regulated MMP9 and MMP2, promoting extracellular matrix degradation and AAD development. We found that NFATc3 promoted VSMC phenotypic switch by binding to eEF2 and inhibiting its phosphorylation in VSMC cytoplasm, increasing protein synthesis and translational elongation, downregulating VSMC differentiation markers, and eventually exacerbating AAD development. We found that cabamiquine, a novel antimalarial agent that targets eEF2 and inhibits protein synthesis, inhibited AAD development and progression in VSMC-specific NFATc3 overexpression mice. Conclusion: Thus, VSMC-NFATc3 promotes VSMC change from contractile to synthetic type and extracellular matrix degradation, exacerbating AAD development, suggesting that VSMC-NFATc3 is a novel therapeutic target for preventing and treating AAD.
2023-06-08 | PXD042816 |
Project description:Vascular stability and tone are maintained by contractile smooth muscle cells (VSMCs). However, injury-induced growth factors stimulate a contractile-synthetic phenotypic modulation which increases susceptibility to abdominal aortic aneurysm (AAA). As a regulator of embryonic VSMC differentiation, we hypothesised that Thymosin β4 (Tβ4) may function to maintain healthy vasculature throughout postnatal life. This was supported by the identification of an interaction with Low density lipoprotein receptor related protein 1 (LRP1), an endocytic regulator of PDGF-BB signalling and VSMC proliferation. LRP1 variants have been implicated by genome-wide association studies with risk of AAA and other arterial diseases. T4-null mice displayed aortic VSMC and elastin defects, phenocopying LRP1 mutants, and their compromised vascular integrity predisposed to Angiotensin II-induced aneurysm formation. Aneurysmal vessels were characterised by enhanced VSMC phenotypic modulation and augmented platelet-derived growth factor (PDGF) receptor (PDGFR)β signalling. In vitro, enhanced sensitivity to PDGF-BB, upon loss of Tβ4, associated with dysregulated endocytosis, with increased recycling and reduced lysosomal targeting of LRP1-PDGFRβ. Accordingly, the exacerbated aneurysmal phenotype in T4-null mice was rescued upon treatment with the PDGFRβ antagonist, Imatinib. Our study identifies Tβ4 as a key regulator of LRP1 for maintaining vascular health and provides insights into the mechanisms of growth factor-controlled VSMC phenotypic modulation underlying aortic disease progression.
2021-05-21 | PXD024162 | Pride
Project description:Introduction: Amplification at chromosome 8q24 is one of the most frequent genomic abnormalities in human cancers and is associated with reduced survival duration in breast and ovarian cancers. The minimal amplified region encodes c-MYC and the non-coding RNA, PVT1 including miR-1204 encoded in exon 1b. Here we analyzed the genomic changes at chromosome 8q24.21 in breast cancer and the functional roles of miR-1204 in breast and ovarian cancer progression. Methods: The genomic changes at chromosome 8q24.21 were detected in 997 breast cancer tumors and 40 breast cancer cell lines. Expression of miR-1204 in breast and ovarian cancer cell lines was investigated by qRT-PCR method. The role of miR-1204 in the tumorigenesis of breast and ovarian cancer was explored using both knockdown and overexpression of miR-1204 in vitro. Candidate miR-1204 target genes from two independent expression microarray datasets and computational predict programs were identified and further validated by qRT-PCR and western blot methods. The role of inhibition of miR-1204 on tamoxifen sensitivity in breast cancer cells was also investigated. Results: MiR-1204 is frequently co-amplified with MYC and expression of miR-1204 is strongly correlated with the expression and amplification of the noncoding PVT1 transcript and less so with MYC in human breast and ovarian cancer cells. Inhibition of miR-1204 decreases cell proliferation and increased apoptosis in breast and ovarian cancer cell lines with 8q24 amplification, but not in lines without amplification and so may be involved in Myc-induced apoptosis. Additionally, overexpression of miR-1204 enhances both breast and ovarian cancer cell growth and Myc-initiated Rat1A cell transformation. Computational and experimental analyses 30 promising candidate miR-1204 target genes. mRNA levels for these genes were assessed after over expression and knockdown of miR-1204 as were protein levels for 10 genes for which antibodies were available. These studies implicated VDR and ESR1 as miR-1204 targets. Inhibition of miR-1204 increased response to tamoxifen in Estrogen Receptor negative breast cancer cell lines. Conclusions: We conclude that amplification of miR-1204 contributes to breast and ovarian pathophysiology at least in part, by increasing proliferation and down regulating apoptosis and by decreasing expression of VDR and ESR1. Seven cell line sample pairs, where samples are LNA transfected with antimiR-1204 or antimiR-1204 control
2012-04-30 | E-GEOD-37185 | biostudies-arrayexpress
Project description:Vascular smooth muscle cell (VSMC) differentiation reprogramming plays an essential role in abdominal aortic aneurysm (AAA). However, the underlying mechanisms are still indistinct. FAM3A (family with sequence similarity 3, member A) is a newly identified metabolism regulator. We examined FAM3A expression and the downstream pathways affected by FAM3A in AAA, and how FAM3A regulated VSMC differentiation. We found that overexpression or supplement of FAM3A significantly attenuated the progression of AAA, manifested by maintenance of VSMC well-differentiation state and inhibition of VSMC transformation towards macrophage-, chondrocyte-, osteogenic-, mesenchymal-, and fibroblast-like cell subpopulations. Importantly, FAM3A induced a decrease in Krüppel-like factor 4 (KLF4) phosphorylation (Ser254) level, leading to its ubiquitination and a weakened nuclear localization. Our findings identify FAM3A as a novel VSMC fate-shaping regulator in AAA and unveil the underpinning mechanism associated with KLF4 ubiquitination and stability, which could develop new strategies based on FAM3A to restore VSMC homeostasis in AAA.
2023-04-23 | GSE230163 | GEO
Project description:Introduction: Amplification at chromosome 8q24 is one of the most frequent genomic abnormalities in human cancers and is associated with reduced survival duration in breast and ovarian cancers. The minimal amplified region encodes c-MYC and the non-coding RNA, PVT1 including miR-1204 encoded in exon 1b. Here we analyzed the genomic changes at chromosome 8q24.21 in breast cancer and the functional roles of miR-1204 in breast and ovarian cancer progression. Methods: The genomic changes at chromosome 8q24.21 were detected in 997 breast cancer tumors and 40 breast cancer cell lines. Expression of miR-1204 in breast and ovarian cancer cell lines was investigated by qRT-PCR method. The role of miR-1204 in the tumorigenesis of breast and ovarian cancer was explored using both knockdown and overexpression of miR-1204 in vitro. Candidate miR-1204 target genes from two independent expression microarray datasets and computational predict programs were identified and further validated by qRT-PCR and western blot methods. The role of inhibition of miR-1204 on tamoxifen sensitivity in breast cancer cells was also investigated. Results: MiR-1204 is frequently co-amplified with MYC and expression of miR-1204 is strongly correlated with the expression and amplification of the noncoding PVT1 transcript and less so with MYC in human breast and ovarian cancer cells. Inhibition of miR-1204 decreases cell proliferation and increased apoptosis in breast and ovarian cancer cell lines with 8q24 amplification, but not in lines without amplification and so may be involved in Myc-induced apoptosis. Additionally, overexpression of miR-1204 enhances both breast and ovarian cancer cell growth and Myc-initiated Rat1A cell transformation. Computational and experimental analyses 30 promising candidate miR-1204 target genes. mRNA levels for these genes were assessed after over expression and knockdown of miR-1204 as were protein levels for 10 genes for which antibodies were available. These studies implicated VDR and ESR1 as miR-1204 targets. Inhibition of miR-1204 increased response to tamoxifen in Estrogen Receptor negative breast cancer cell lines. Conclusions: We conclude that amplification of miR-1204 contributes to breast and ovarian pathophysiology at least in part, by increasing proliferation and down regulating apoptosis and by decreasing expression of VDR and ESR1.
2012-05-01 | GSE37185 | GEO