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Effect of CRISPR/Cas9 activating library on oxaliplatin resistance during oxaliplatin treatment of HepG2 cells [CRISPR cas9]

ABSTRACT: To identify key drivers of oxaliplatin, Cas9 protein was overexpressed in HepG2 cells. Next, we treated the cell pool with vehicle or OXA for 3 days to enable positive and negative screening

ORGANISM(S): Homo sapiens

PROVIDER: GSE206500 | GEO | 2023/02/28

REPOSITORIES: GEO

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Effect of CRISPR/Cas9 activating library on oxaliplatin resistance during oxaliplatin treatment of HepG2 cells [CRISPR cas9]

Project description:Effect of CRISPR/Cas9 activating library on oxaliplatin resistance during oxaliplatin treatment of HepG2 cells [CRISPR cas9]

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Differentially expressed genes between oxaliplatin-resistant and oxaliplatin-non-resistant patient samples [Clinical samples-RNA-seq]

Project description:To identify key drivers of oxaliplatin resistance, we collected and analyzed the DEGs between oxaliplatin-resistant and oxaliplatin-non-resistant patient samples

2023-02-28 | GSE206501 | GEO

Genome-wide transcriptomic profiling of oxaliplatin response

Project description:Oxaliplatin (OXA) is a member of the family of Pt-containing chemotherapeutic agents that also include cisplatin (CDDP) and carboplatin. OXA is distinguished from these two older drugs by its different spectrum of activity both in preclinical models and in clinical trials. It is the only platinum analogue to have activity in colon cancer, a disease for which this drug has now become a mainstay of therapy. It mainly forms intrastrand adducts between two adjacent guanine residues or guanine and adenine, disrupting DNA replication and transcription. OXA has been reported to be involved in the Nucleotide Excision Repair Pathway (NER), p38 kinase activation, PI3K/AKT pathway and caspase cascade activation through the apoptotic intrinsic pathway. However, not all colon cancer cells show the same sensitivity to OXA. In this study we have compared the changes in RNA expression profiles of colon cancer cell lines with different sensitivity to OXA, determined by IC50.

2011-07-01 | GSE30011 | GEO

Model Establishment of Mice with Oxaliplatin-induced Hepatic Sinusoidal Obstruction Syndrome

Project description:To further explore to mechanisms of oxaliplatin-induced hepatic sinusodial obstruction syndrome, we established a mouse model of OXA-induced HSOS and the difference of mRNA expression level between normal mice and model mice was detected.

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High-throughput sequencing analysis of miRNAs expression profiles in the HCT116 colorectal cancer sublines resistant to oxaliplatin (Oxa) or 5-fluorouracil (5-FU).

Project description:In the present study, we investigated miRNA expression changes caused by aquired chemoresistance to 5-FU or Oxa. 40 and 14 miRNAs were detected as differentially expressed in 5-fluouracil- and oxaliplatin-resistant colorectal HCT116 sublines, respectively. Differentially expressed miRNAs determined in the present study could be applied for further development of diagnostic and therapeutic applications for colorectal cancer carcinoma resistant to 5-FU or Oxa.

2019-12-31 | GSE119481 | GEO

Pharmacogenomic Approach for the Identification of Novel Determinants of Resistance to Oxaliplatin in Colon Cancer

Project description:Oxaliplatin is a member of the family of Pt-containing chemotherapeutic agents that also include cisplatin (CDDP) and carboplatin. OXA is distinguished from these two older drugs by its different spectrum of activity both in preclinical models and in clinical trials. It is the only platinum analogue to have activity in colon cancer, a disease for which this drug has now become a mainstay of therapy. It mainly forms intrastrand adducts between two adjacent guanine residues or guanine and adenine, disrupting DNA replication and transcription. OXA has been reported to be involved in the Nucleotide Excision Repair Pathway (NER), p38 kinase activation, PI3K/AKT pathway and caspases cascade activation through apoptotic intrinsic pathway. However, the downstream molecular events underlying the cytotoxic effects of this chemotherapeutic agent have not been well characterized. This study was developed in order to clarify the multifactoriality of the resistance acquisition process and to identify genes and pathways that could play a role as markers in OXA sensitivity. Keywords: Drug resistance The goal of our experiment was to determine a gene expression profile that discriminates between the OXA-sensitive colorectal cancer cell lines HT29, LoVo, DLD1 and LS513 group and the group of OXA-resistant derived cell lines HTOXAR3, LoVOXAR3, DLDOXAR3 and LSOXAR3 in order to clarify the multifactoriality of the resistance acquisition process and to identify genes and pathways that could play a role as markers in OXA sensitivity. The experimental design used was âRNA-Referenceâ and âDye-Swapâ. Each cell line was analyzed in duplicate, with RNA reference (Stratagene) as reference sample and labeled each biological condition once by Cy3 and once by Cy5. Taking the average of two arrays thus labeled, cancel the dye effect on any particular gene. In total we used 16 slides.

2010-05-26 | E-GEOD-10405 | biostudies-arrayexpress

Curcumin mediates oxaliplatin-acquired resistance reversion in colorectal cancer cell lines through modulation of CXC-Chemokine/NF-kB signaling pathway

Project description:Resistance to oxaliplatin (OXA) is a complex process affecting the outcomes of metastatic colorectal cancer (CRC) patients treated with this drug. The NF-kBsignalling pathway deregulation has been proposed as an important mechanism involved in this phenomenon. Here, we show that NF-kBwas hyperactivated in in vitro models of OXA-acquired resistance but was attenuated by the addition of Curcumin, a non-toxic NF-kB inhibitor. The concomitant combination of Curcumin+OXA was more effective and synergistic in cell lines with acquired resistance to OXA, leading to the reversion oftheir resistant phenotype, through the inhibition of the NF-kBsignalling cascade. Transcriptomic profiling revealed the up-regulation of three NF-KB-regulated CXC-chemokines, CXCL8, CXCL1 and CXCL2, in the resistant cells thatwere more efficiently down-regulated after OXA+Curcumin treatment as compared to the sensitive cells. Moreover, CXCL8 and CXCL1 gene silencing made resistant cells more sensitive to OXA through the inhibition of the Akt/NF-kBpathway. High expression of CXCL1 in FFPE samples from explant cultures of CRC patients-derived liver metastaseswas associated with response to OXA+Curcumin.In conclusion, we suggest that combination of OXA+Curcumincould be an effective treatment in CRC patients after progression to OXA-based chemotherapy being CXCL1a good candidate predictive marker to this treatment.

2016-12-07 | GSE76092 | GEO

Pharmacogenomic Approach for the Identification of Novel Determinants of Resistance to Oxaliplatin in Colon Cancer

2008-02-07 | GSE10405 | GEO

WNT3 Promotes Chemoresistance in Oral Squamous Cell Carcinoma via Activating the Canonical β-catenin Pathway

Project description:Oral squamous cell carcinoma (OSCC) represents a major malignancy in the oral and maxillofacial region. The primary therapeutic agents, 5-fluorouracil (5FU) and oxaliplatin (OXA), often encounter the challenge of chemoresistance, leading to treatment failure. The WNT/β-catenin signaling pathway, closely tied with chemoresistance, offers a promising therapeutic avenue. This study delves into this potential connection. 5FU-resistant and OXA-resistant cell lines were established by gradually elevating the drug concentration in the culture medium. Differential gene expressions between parental and resistant cells were analyzed by RNA sequencing analysis, which was then substantiated via RT-qPCR and western blot. The influence of the WNT signaling on OSCC drug resistance was ascertained through WNT3 knockdown or overexpression. The WNT inhibitor, MSAB, was probed for its capacity to boost the efficacy of 5FU or OXA. Through transcriptome sequencing, successfully derived 5FU-resistant and OXA-resistant cell lines revealed a conspicuous activation of the WNT/β-catenin signaling pathway in the drug-resistant cells. WNT3 was identified as a pivotal factor contributing to chemoresistance in OSCC. Counteracting β-catenin notably augmented the therapeutic potency of 5FU and OXA. Our study underscored the activation of the WNT/β-catenin signaling pathway in resistant OSCC cell lines. By modulating WNT signaling activity, drug resistance in OSCC cells may be effectively circumvented.

2024-05-15 | GSE248792 | GEO

Minimal genome-wide human CRISPR-Cas9 library.

Project description:CRISPR guide RNA libraries have been iteratively improved to provide increasingly efficient reagents, although their large size is a barrier for many applications. We design an optimised minimal genome-wide human CRISPR-Cas9 library (MinLibCas9) by mining existing large-scale gene loss-of-function datasets, resulting in a greater than 42% reduction in size compared to other CRISPR-Cas9 libraries while preserving assay sensitivity and specificity. MinLibCas9 provides backward compatibility with existing datasets, increases the dynamic range of CRISPR-Cas9 screens and extends their application to complex models and assays.

| S-EPMC7818936 | biostudies-literature

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