Development of a Mouse Model of Sturge-Weber Syndrome and Therapeutic Response to Imatinib
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE189023 | GEO | 2022/10/31
REPOSITORIES: GEO
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Project description:Sturge-Weber syndrome (SWS) is a sporadic, congenital, neuro-cutaneous disorder characterized by a mosaic, capillary malformation. SWS and isolated capillary malformations are caused by a somatic activating mutation in GNAQ encoding the G protein subunit alpha-q protein. The missense mutation R183Q is the sole GNAQ mutation identified thus far in affected tissues of 90% of SWS patients. In this study, we sequenced skin biopsies of affected capillary malformations from 9 patients. We identified the R183Q mutation in nearly all samples, but one sample exhibited a Q209R mutation. This new mutation occurs at the same residue as the constitutively-activating Q209L mutation, commonly seen in tumors. However, Q209R is a rare variant in this gene. To compare the effect of the Q209R mutation on downstream signaling, we performed reporter assays with a GNAQ-responsive reporter co-transfected with either GNAQ WT, R183Q, Q209L, Q209R, or C9X (representing a null allele). Q209L showed the highest reporter activation, with R183Q and Q209R showing significantly lower activation. To determine whether these mutations had similar or different downstream consequences we performed RNAseq analysis in microvascular endothelial cells (HMEC-1) electroporated with the same GNAQ variants. The R183 and Q209 missense variants caused extensive dysregulation of a broad range of transcripts compared to the WT or null allele, confirming that these are all activating mutations. However, the missense variants exhibited very few differentially expressed genes (DEGs) when compared to each other. These data suggest that these activating GNAQ mutations differ in magnitude of activation but have similar downstream effects.
2022-07-28 | GSE199978 | GEO
Project description:<p>Sturge-Weber syndrome (SWS) is a rare, congenital syndrome with vascular malformations of the brain, skin and eye. The underlying cause of SWS is unknown and the extent of involvement varies greatly from patient to patient. Those with brain involvement present with seizures, stroke-like episodes and neurologic deficits, usually in infancy. Those with eye involvement frequently develop vision threatening glaucoma and retinal injury. Treatment has been largely symptomatic and hampered by delayed diagnosis and the rarity of the condition.</p> <p>The purpose of this study is to determine the reliability of non-invasive measures to be developed as biomarkers for SWS and to determine inter-rater reliability where appropriate. This includes measuring reliability for:</p> <p> <ul> <li>Power asymmetry on Quantitative Electroencephalogram</li> <li>Asymmetry of Transcranial Doppler velocity and pulsatility</li> <li>Behavioral outcome measures (PEDI, Erhardt, Modified Rankin Scale)</li> <li>Optical Coherence Tomography</li> </ul> </p> <p> Approximately 40 subjects will participate in this observational, cross-sectional study. The first version study release included data of the first n=25 subjects. </p>
| phs001281 | dbGaP
Project description:Introduction: Capillary malformation (CM) occurs sporadically and is associated with Sturge-Weber syndrome (SWS). The somatic mosaic mutation in GNAQ (c.548GàA, p.R183Q) is enriched in endothelial cells (EC) in skin CM and SWS brain CM. Our goal was to investigate how the mutant G-protein a-q subunit (Gaq) alters EC signaling and disrupts capillary morphogenesis. Approach and results: We used lentiviral constructs to express p.R183Q or wild-type GNAQ in normal human endothelial colony forming cells (EC-R183Q and EC-WT respectively). EC-R183Q constitutively activated phospholipase-C β3 (PLCβ3), a downstream effector of Gαq. Activated PLCβ3 was also detected in human CM tissue sections. Bulk RNA-seq analyses of mutant versus wild-type EC indicated constitutive activation of protein kinase C (PKC), NF-κB and calcineurin signaling in EC-R183Q. Increased expression of downstream targets in these pathways, Angiopoetin-2 (ANGPT2), C-X-C Motif Chemokine Ligand 5 (CXCL5) and Down Syndrome Critical Region Protein 1.4 (DSCR1.4) were confirmed by qPCR and immunostaining of human CM tissue sections. The Gαq inhibitor YM-254890 reduced mRNA expression levels of these targets in EC-R183Q while the pan-PKC inhibitor AEB071 reduced ANGPT2 and CXCL5 but not DSCR1.4. EC-R183Q formed enlarged blood vessels in mice, reminiscent of those found in human CM, with robust endothelial ANGPT2. Conclusions: Gaq-R183Q, when expressed in ECs, establishes constitutively active PLCb3 signaling that leads to a pro-angiogenic, pro-inflammatory phenotype. EC-R183Q are sufficient to form CM-like vessels in mice which provides the first evidence that endothelial Gaq-R183Q is causative for CM.
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Project description:Gastrointestinal Stromal Tumor frequently harbor mutations in the KIT receptor tyrosine kinase and depend on its activity for growth. This underlies the efficacy of imatinib, a inhibitor of KIT activity, in GIST management. GIST882 is a patient derived GIST cell line that harbor a K640E exon 13 KIT mutation and is sensitive to imatinib treatment. To analyze the downstream effect of KIT inhibition, GIST882 cells were treated for 8 hours with 1μM Imatinib.
2010-10-13 | GSE22433 | GEO
Project description:Abstract: Most GISTs require oncogenic activation of the KIT or PDGFRA receptor tyrosine kinase proteins, and the genomic mechanisms of oncogene activation are heterogeneous. Notably, the kinase mutation type correlates with both tumor biology and imatinib response. For example, GISTs with KIT exon 11 mutations are typically gastric and have excellent imatinib response, whereas those with KIT exon 9 mutations generally arise in the small bowel and are less responsive to imatinib. To identify genes that might contribute to these biological differences, we carried out gene expression profiling of 26 GISTs with known KIT and PDGFRA mutational status. Expression differences were then evaluated further by RNA in situ hybridization, immunohistochemistry, and immunoblotting. Unsupervised hierarchical clustering grouped tumors with similar mutations together, but the distinction between the different groups was not absolute. Differentially expressed genes included ezrin, p70S6K, and PKCs, which are known to have key roles in KIT or PDGFRA signaling, and which might therefore contribute to the distinctive clinicopathological features in GISTs with different mutation types. These gene products could serve as highly selective therapeutic targets in GISTs containing the KIT or PDGFRA mutational types with which they are associated. A disease state experiment design type is where the state of some disease such as infection, pathology, syndrome, etc is studied. Keywords: disease_state_design
2006-01-10 | GSE4001 | GEO
Project description:Hereditary hemorrhagic telangiectasia (HHT, alias Rendu-Osler-Weber syndrome) is an autosomal dominant genetic disease that causes vascular malformations in multiple organs. Malformations and shunts in the liver are relevant for the long-term prognosis as they can lead to heart failure. Moreover, the role of ALK-1 in the hepatic vascular niche remains elusive. In this project, we aimed to establish a novel HHT model covering hepatic involvement by the disease and to investigate the role of ALK-1 in the hepatic vascular niche. We crossed Stab2-icre mice (MGI: 6741034) with Acvrl1-floxed mice (MGI: 4398901) to generate constitutive hepatic endothelial Acvrl1 knockout (Acvrl1-HEC-KO, alias Alk1-HEC-KO) mice. To dissect microvascular transcriptomic alterations, we performed RNA sequencing of freshly isolated hepatic endothelial cells from 3 months old mice. Transcriptomic analyses revealed an arterialization of hepatic vessels accompanied by loss of LYVE-1 and induction of Endomucin. The loss of endothelial Wnt2, Wnt9b, and Rspo3 led to a disruption of hepatic metabolic zonation with a dominance of periportal genes in Alk1-HEC-KO mice and HHT patients. Furthermore, we identified PRND (alias Doppel) and placenta growth factor (PlGF) as novel candidates of HHT pathogenesis in mice. ALK-1 controls hepatic metabolic zonation via Wnt signaling and suppresses PRND and PlGF that represent novel candidates in HHT pathogenesis.
2023-04-06 | GSE184747 | GEO
Project description:Hereditary hemorrhagic telangiectasia (HHT, alias Rendu-Osler-Weber syndrome) is an autosomal dominant genetic disease that causes vascular malformations in multiple organs. Malformations and shunts in the liver are relevant for the long-term prognosis as they can lead to heart failure. Moreover, the role of ALK-1 in the hepatic vascular niche remains elusive. In this project, we aimed to establish a novel HHT model covering hepatic involvement by the disease and to investigate the role of ALK-1 in the hepatic vascular niche. We crossed Stab2-icre mice (MGI: 6741034) with Acvrl1-floxed mice (MGI: 4398901) to generate constitutive hepatic endothelial Acvrl1 knockout (Acvrl1-HEC-KO, alias Alk1-HEC-KO) mice. To dissect hepatic transcriptomic alterations, we performed RNA sequencing of freshly isolated whole liver cells from 3 months old mice. Transcriptomic analyses revealed an arterialization of hepatic vessels accompanied by loss of LYVE-1 and induction of Endomucin. The loss of endothelial Wnt2, Wnt9b, and Rspo3 led to a disruption of hepatic metabolic zonation with a dominance of periportal genes in Alk1-HEC-KO mice and HHT patients. Furthermore, we identified PRND (alias Doppel) and placenta growth factor (PlGF) as novel candidates of HHT pathogenesis in mice. ALK-1 controls hepatic metabolic zonation via Wnt signaling and suppresses PRND and PlGF that represent novel candidates in HHT pathogenesis.
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Project description:Pericytes/vascular smooth muscle cells (VSMCs), regulated by platelet-derived growth factor receptor β (PDGFRβ) signaling, play important roles in endothelial survival and vascular stability. Here we report that treatment with imatinib, an inhibitor of PDGFRβ, led to significant tumor growth impairment associated with increased apoptosis in human lymphoma xenografts including Farage, Karpas422 and OCI-Ly7 in SCID mice. Confocal analysis of the tumor tissue showed decreased microvessel density, decreased vascular flow, and increased vascular leak in the imatinib-treated cohorts. Imatinib targeted tumor-associated PDGFRβ+ pericytes in vivo by inducing apoptosis and disruption of the PDGFRβ+ perivascular network, and PDGFRβ+ VSMC in vitro by inhibition of proliferation. FACS analysis of mononuclear cell suspension of tumor tissues revealed decreased mature pericytes and endothelial cells, as well as their progenitors with imatinib treatment. Compared to imatinib, treatment with anti-PDGFRβ monoclonal antibody partially inhibited the growth of Farage lymphomas. Lastly, microarray analysis of differentially expressed genes in PDGFRβ+ VSMC following imatinib treatment showed significant down-regulation of genes implicated in proliferation, survival and angiogenesis, including those within PI3K/AKT and MAPK/ERK1/2 pathways downstream of PDGFRβ signaling. Taken together, targeting PDGFRβ+ pericytes in lymphoma presents a novel and complementary target to endothelial cells for efficacious antiangiogenic therapy. PDGFRb+ murine vascular smooth muscle cells (VSMCs) were treated in 10 uM imatinib for 24 or 48 hours. Gene expression changes in response to imatinib treatment were examined using NimbleGen MM8_60mer gene expression microarrays by comparing expression patterns at 24- and 48-hours treatment to the baseline level (0 hours).
2013-04-22 | E-GEOD-30752 | biostudies-arrayexpress
Project description:Pericytes/vascular smooth muscle cells (VSMCs), regulated by platelet-derived growth factor receptor β (PDGFRβ) signaling, play important roles in endothelial survival and vascular stability. Here we report that treatment with imatinib, an inhibitor of PDGFRβ, led to significant tumor growth impairment associated with increased apoptosis in human lymphoma xenografts including Farage, Karpas422 and OCI-Ly7 in SCID mice. Confocal analysis of the tumor tissue showed decreased microvessel density, decreased vascular flow, and increased vascular leak in the imatinib-treated cohorts. Imatinib targeted tumor-associated PDGFRβ+ pericytes in vivo by inducing apoptosis and disruption of the PDGFRβ+ perivascular network, and PDGFRβ+ VSMC in vitro by inhibition of proliferation. FACS analysis of mononuclear cell suspension of tumor tissues revealed decreased mature pericytes and endothelial cells, as well as their progenitors with imatinib treatment. Compared to imatinib, treatment with anti-PDGFRβ monoclonal antibody partially inhibited the growth of Farage lymphomas. Lastly, microarray analysis of differentially expressed genes in PDGFRβ+ VSMC following imatinib treatment showed significant down-regulation of genes implicated in proliferation, survival and angiogenesis, including those within PI3K/AKT and MAPK/ERK1/2 pathways downstream of PDGFRβ signaling. Taken together, targeting PDGFRβ+ pericytes in lymphoma presents a novel and complementary target to endothelial cells for efficacious antiangiogenic therapy.
2013-04-22 | GSE30752 | GEO