Dose Finding and Pharmacokinetics/Pharmacodynamics Study of Apatinib in the Treatment of Advanced Colorectal Cancer
Ontology highlight
ABSTRACT:
DISEASE(S): Colorectal Cancer,Colorectal Neoplasms
PROVIDER: 2120259 | ecrin-mdr-crc |
REPOSITORIES: ECRIN MDR
Similar Datasets
Project description:Famitinib is a tyrosin-inhibitor agent targeting at c-Kit, VEGFR2, PDGFR, VEGFR3, Flt1 and Flt3, and it’s anti-angiogenesis effect has been viewed in preclinical tests. Phase I study has shown that the toxicity is manageable.
The purpose of this study is to determine whether Famitinib can improve progression free survival compared with placebo in patients with advanced colorectal cancer who failed in previous at least two lines of chemotherapy.
| 2137827 | ecrin-mdr-crc
Project description:Angiogenesis inhibitors, such as sunitinib, represent a promising strategy to improve glioblastoma (GBM) tumor response. In this study, we used the O6-methylguanine methyltransferase (MGMT)-negative GBM cell line U87MG stably transfected with MGMT (U87/MGMT) to assess whether MGMT expression affects the response to sunitinib. We showed that the addition of sunitinib to standard therapy (temozolomide [TMZ] and radiation therapy [RT]) significantly improved the response of MGMT positive but not of MGMT-negative cells. Gene expression profiling revealed alterations in the angiogenic profile, as well as differential expression of several receptor tyrosine kinases targeted by sunitinib. MGMT-positive cells displayed higher levels of vascular endothelial growth factor receptor 1 (VEGFR-1) compared with U87/EV cells, whereas they displayed decreased levels of VEGFR-2. Depleting MGMT using O6-benzylguanine suggested that the expression of these receptors was directly related to the MGMT status. Also, we showed that MGMT expression was associated with a dramatic increase in the soluble VEGFR-1/VEGFA ratio, thereby suggesting a decrease in bioactive VEGFA and a shift towards an antiangiogenic profile. The reduced angiogenic potential of MGMT-positive cells is supported by: (i) the decreased ability of their secreted factors to induce endothelial tube formation in vitro and (ii) their low tumorigenicity in vivo compared with the MGMT-negative cells. Our study is the first to show a direct link between MGMT expression and decreased angiogenicity and tumorigenicity of GBM cells and suggests the combination of sunitinib and standard therapy as an alternative strategy for GBM patients with MGMT-positive tumors.
2012-09-11 | GSE40776 | GEO
Project description:Tissue inhibitors of metalloproteinases 3 (TIMP3) were originally characterized as inhibitors of matrix metalloproteinases (MMPs), acting as potent antiangiogenic proteins. In this study, we demonstrated that the arylsulfonamide derivative MPT0G013 has potent antiangiogenic activities in vitro and in vivo via inducing TIMP3 expression. Treatments with MPT0G013 significantly inhibited endothelial cell functions, such as cell proliferation, migration, and tube formation, as well as induced p21 and cell cycle arrest at the G0/G1 phase. Subsequent microarray analysis showed significant induction of TIMP3 gene expression by MPT0G013, and siRNA-mediated blockage of TIMP3 up-regulation abrogated the antiangiogenic activities of MPT0G013 and prevented inhibition of p-AKT and p-ERK proteins. Importantly, MPT0G013 exhibited antiangiogenic activities in in vivo Matrigel plug assays, inhibited tumor growth and up-regulated TIMP3 and p21 proteins in HCT116 mouse xenograft models. These data suggest potential therapeutic application of MPT0G013 for angiogenesis-related diseases such as cancer.
2017-02-09 | GSE56927 | GEO
Project description:Purinergic P2 receptors are critical regulators of several functions within the vascular system, including platelet aggregation, vascular inflammation and vascular tone. A role for ATP release and P2Y receptors in angiogenesis has been implicated, however, the involvement of purinergic signalling in endothelial sprouting and vascular growth remains poorly understood. Here, we demonstrate that blood vessel growth is controlled by P2Y2 receptors. Inhibition of P2Y2 using a selective antagonist or modulation of P2Y2 receptor expression significantly influenced sprouting and vascular tube formation. Mechanistically, overexpression of P2Y2 in endothelial cells resulted in increased expression of the pro-angiogenic molecules CXCR4, CD34 and angiopoietin-2, while expression of Tie2 and VEGFR-2 decreased. Interestingly, elevated P2Y2 expression caused constitutive phosphorylation of ERK1/2 and VEGFR-2. However, stimulation of cells with the P2Y2 agonist UTP did not influence sprouting unless P2Y2 was constitutively expressed, indicating that enhanced receptor expression, and not activation, is the primary trigger for angiogenesis. Our data suggest that P2Y2 receptors have an essential function in angiogenesis through cross-talk of P2Y2 and VEGFR-2 and that P2Y2 may represent a therapeutic target to regulate blood vessel growth.
2019-07-04 | GSE133795 | GEO
Project description:Angiogenesis inhibitors, such as sunitinib, represent a promising strategy to improve glioblastoma (GBM) tumor response. In this study, we used the O6-methylguanine methyltransferase (MGMT)-negative GBM cell line U87MG stably transfected with MGMT (U87/MGMT) to assess whether MGMT expression affects the response to sunitinib. We showed that the addition of sunitinib to standard therapy (temozolomide [TMZ] and radiation therapy [RT]) significantly improved the response of MGMT positive but not of MGMT-negative cells. Gene expression profiling revealed alterations in the angiogenic profile, as well as differential expression of several receptor tyrosine kinases targeted by sunitinib. MGMT-positive cells displayed higher levels of vascular endothelial growth factor receptor 1 (VEGFR-1) compared with U87/EV cells, whereas they displayed decreased levels of VEGFR-2. Depleting MGMT using O6-benzylguanine suggested that the expression of these receptors was directly related to the MGMT status. Also, we showed that MGMT expression was associated with a dramatic increase in the soluble VEGFR-1/VEGFA ratio, thereby suggesting a decrease in bioactive VEGFA and a shift towards an antiangiogenic profile. The reduced angiogenic potential of MGMT-positive cells is supported by: (i) the decreased ability of their secreted factors to induce endothelial tube formation in vitro and (ii) their low tumorigenicity in vivo compared with the MGMT-negative cells. Our study is the first to show a direct link between MGMT expression and decreased angiogenicity and tumorigenicity of GBM cells and suggests the combination of sunitinib and standard therapy as an alternative strategy for GBM patients with MGMT-positive tumors. RNA was isolated from parental U87 (U87_EV) and MGMT-transfected U87 (U87_MGMT) triplicate. Pairwise gene expression differences were compared between the two cell lines. Features selected had more than 2-fold up-or down-regulated (P values of >05, unpaired Studentâs t-test with Bonferroni multiple testing correction) were identified. Database for annotation, visualization, and integrated discovery23 was used to identify enriched gene ontology (GO) biological themes.24 The GO data mining was conducted at a term specificity level 3.25 The EASE score was set at 0.05 and the minimum number of genes in a category was 5.
2012-09-11 | E-GEOD-40776 | biostudies-arrayexpress
Project description:A growing amount of reports has consistently evidenced that a sustained inhibition of the angiogenesis is an effective therapeutic strategy, able to improve the outcome of metastatic colorectal cancer (mCRC) patients.
In the last decade different biologic agents targeting angiogenesis have been approved for the treatment of mCRC, such as bevacizumab, aflibercept and regorafenib, and, more recently, solid evidences have demonstrated the efficacy of a sustained antiangiogenic approach even beyond the first progression to a bevacizumab-containing regimen. In particular, two phase III randomized trials proved the effectiveness of prosecuting bevacizumab in second-line switching the chemotherapeutic regimen in patients already treated with bevacizumab in first-line. Preliminary experiences evidenced that circulating levels of angiogenesis-related markers are significantly modulated during first-line chemotherapy plus bevacizumab. In particular, a wide variability of plasma soluble Vascular Endothelial Growth Factor Receptor-2 (VEGFR-2) levels is observed at the time of disease progression and retrospective data suggest that benefit from the continuation of bevacizumab may be restricted to patients with high levels of soluble VEGFR-2 at the first evidence of disease progression. This study aims at prospectively validating those retrospective data.
| 2203761 | ecrin-mdr-crc
Project description:Developing strategies to overcome the frequent resistance to VEGF/VEGFR inhibitors in patients is a major challenge in antiangiogenic therapy for cancer. Targeting the VEGF pathway in vivo induces hypoxia and therefore enables to study drug-induced hypoxia in tumors. Hypoxia also occurs in the spontaneous evolution of cancers, particularly around areas of necrosis. Using cell markers such as CD133, CXCR4, or ALDH1, we identified stem-like cells in peri-necrotic areas in human biopsies and xenografts models of renal cancers. These stem-like cells were able in vitro to self-renew, form carcinoma spheres and had a tumorigenic potency, thus showing characteristics of stem-like cancer cells. In xenografted human renal cell carcinoma, we further demonstrated a strong link between necrosis, either spontaneous or treatment-induced, and the presence of CD133/CXCR4 double positive stem-like cells. Hypoxia increased their tumorigenic potency, induced overexpression of metallothionein2A, which we here identified as critical regulator of resistance to VEGFR-inhibition.
2014-12-31 | GSE32414 | GEO
Project description:We have previously shown that low doses of ionizing radiation (LDIR) induce angiogenesis. In the present study we investigated their action in experimentally induced hindlimb ischemia. We demonstrated that 0.3 Gy, administered for four consecutive days, significantly improves blood perfusion in the murine ischemic limb by stimulating angiogenesis and arteriogenesis. This is achieved through durable and simultaneous up-regulation of a repertoire of pro-angiogenic factors and their receptors in endothelial cells, as evident in cells isolated from the irradiated gastrocnemius muscles. Moreover, we demonstrated that this mechanism is mediated via VEGFR signaling, since VEGFR inhibition abrogated the LDIR-mediated gene up-regulation and impeded the increase in vessel density. Importantly, the vasculature in an irradiated non-ischemic bed is not affected and no adverse effects associated to the use of LDIR were seen. These findings disclose an innovative, non-invasive strategy to induce therapeutic angiogenesis in a murine model of severe hindlimb ischemia, emerging as a novel approach in the treatment of Critical Limb Ischemia patients.
2017-05-22 | GSE73341 | GEO
Project description:The vascular endothelial growth factor (VEGF) /VEGF receptor (VEGFR) axis is an essential regulator of angiogenesis and important therapeutic target in cancer. However, the efficacy of combination treatment with an anti-VEGFR2 antibody and anti-VEGFR-A antibody on tumor progression is not clear. In this study, we examined the anti-tumor effect of the combination treatment using BALB/c-nu/nu mouse xenograft model subcutaneously injected with human gastric cancer MKN45 cells. In this model, we evaluated intra-tumor molecular changes after the combination treatment by cDNA microarray analysis.
2021-07-28 | GSE160613 | GEO