Project description:Oxaliplatin(OXA) chemotherapy protocols are used in treatment of cancers like colorectal (CRC) and pancreatic cancer. OXA causes peripheral neuropathy which is considered treatment limiting factor. In recent studies, it shows that omeprazole(OME) has antioxidant effect and can inhibit organic cation transporter 2 (OCT2) in kidney. So OME can protect against peripheral neuropathy induced by OXA through oxidative stress . Also OME activates extracellular-signal-regulated kinase(ERK) / mitogen activated protein kinase ( MAPK) pathway, so improves demyelinating symptoms.
Project description:Mesothelioma is an aggressive cancer of the mesothelial layer associated with an extensive fibrotic response. The latter is in large part mediated by cancer-associated fibroblasts which mediate tumour progression and poor prognosis. However, understanding of the crosstalk between cancer cells and fibroblasts in this disease is mostly lacking. Here, using co-cultures of patient-derived mesothelioma cell lines and lung fibroblasts, we demonstrate that fibroblast activation is a self-propagated process producing a fibrotic extracellular matrix (ECM) and triggering drug resistance in mesothelioma cells. Following characterisation of mesothelioma cells/fibroblasts signalling crosstalk, we identify several FDA-approved targeted therapies as far more potent than standard-of-care Cisplatin/Pemetrexed in ECM-embedded co-culture spheroid models. In particular, the SRC family kinase inhibitor, Saracatinib, extends overall survival well beyond standard-of-care in a mesothelioma genetically-engineered mouse model. In short, we lay the foundation for the rational design of novel therapeutic strategies targeting mesothelioma/fibroblast communication for the treatment of mesothelioma patients.
Project description:Extracellular-regulated kinases (ERK1/2 and 5) are known to play important roles in growth and drug resistance of various cancers. Here we show roles of inhibition of ERK1, ERK2, or ERK5 on gene expression profiles of epithelioid malignant mesothelioma (MM) cells (HMESO). Untransfected human mesothelial cells (LP9), MM cells (HMESO) or HMESO cells stably transfected with shControl, shERK1, shERK2 , or shERK5 plasmids were used. Microarrays were performed on samples from 3 independent experiments. Each sample was analyzed on a separate array (3 independent biological replicates).
Project description:The purpose of this study is to determine the safety of an extracellular signal regulated kinase (ERK1/2) inhibitor LY3214996 administered alone or in combination with other agents in participants with advanced cancer.
Project description:To investigate the differences between mesothelioma- organoid culture and 2D traditional culture, we established 7 mesothelioma lines and 3 normal mesothelial cells from model mouse. We then performed gene expression profiling analysis using data obtained from RNA-seq of 20 different cells.
Project description:Kynureninase is a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes known as the aspartate aminotransferase superfamily or alpha-family. The Homo sapiens and other eukaryotic constitutive kynureninases preferentially catalyze the hydrolytic cleavage of 3-hydroxy-l-kynurenine to produce 3-hydroxyanthranilate and l-alanine, while l-kynurenine is the substrate of many prokaryotic inducible kynureninases. The human enzyme was cloned with an N-terminal hexahistidine tag, expressed, and purified from a bacterial expression system using Ni metal ion affinity chromatography. Kinetic characterization of the recombinant enzyme reveals classic Michaelis-Menten behavior, with a Km of 28.3 +/- 1.9 microM and a specific activity of 1.75 micromol min-1 mg-1 for 3-hydroxy-dl-kynurenine. Crystals of recombinant kynureninase that diffracted to 2.0 A were obtained, and the atomic structure of the PLP-bound holoenzyme was determined by molecular replacement using the Pseudomonas fluorescens kynureninase structure (PDB entry 1qz9) as the phasing model. A structural superposition with the P. fluorescens kynureninase revealed that these two structures resemble the "open" and "closed" conformations of aspartate aminotransferase. The comparison illustrates the dynamic nature of these proteins' small domains and reveals a role for Arg-434 similar to its role in other AAT alpha-family members. Docking of 3-hydroxy-l-kynurenine into the human kynureninase active site suggests that Asn-333 and His-102 are involved in substrate binding and molecular discrimination between inducible and constitutive kynureninase substrates.
Project description:transcriptional profiling of makignant mesothelioma cell lines comparing control one immortalized mesothelial cell line, MeT-5A, and 2 primary normal mesothelial cultures collected from ascites of non-cancer patients, OV-M1 and GAS-M1 Two-condition experiment, mesothleioma cells vs. normal mesothelial cells