Evaluation for neurotoxicity of oxaliplatin using Nerve Conduction Velocity
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ABSTRACT:
DISEASE(S): Colorectal Cancer
PROVIDER: 2619755 | ecrin-mdr-crc |
REPOSITORIES: ECRIN MDR
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Project description:The earthworm Eisenia fetida is one of the most used species in standardized soil ecotoxicity tests. Endpoints such as survival, growth and reproduction are ecologically relevant but provide little mechanistic insight into the toxicity pathways, especially at the molecular level. To better understand toxicological modes of action and to facilitate the development of molecular biomarkers, we have obtained 30,245 unique EST sequences from E. fetida and have designed a novel microarray with 15,119 60-mer oligonucleotide probes. These probes target the unique non-redundant EST sequences identified in E. fetida. Using this array we have profiled gene expression of E. fetida after exposure to CL-20, a cage cyclic nitramine previously found exhibiting reversible neurotoxicity to worms. Worms were exposed for 6 days to CL-20. Half of the exposed worms were allowed to recover in a clean environment for 7 days. Electrophysiological analysis showed that the conduction velocity of worm medial giant nerve fiber was significantly decreased after 6-d exposure to CL-20, and that giant nerve fiber function was restored at the end of the 7-d recovery period. Total RNA samples isolated from four treatment groups (6 replicates per group), i.e., 6-d control, 6-d exposed, 13-d control and 6-d exposed with 7-d recovery, were analyzed using the new 15K oligo array. Bioinformatics and statistical analyses have identified specific neurological pathways affected by CL-20 and recovery of these pathways after CL-20 removal. These results provide significant insights on the CL-20 toxic mode of action and how earthworms can recover from chemical stressors. Adult earthworms (E. fetida) were exposed on filter paper to CL-20 (0.2 ug/cm2) for 6 days with or without 7-day recovery (4 treatment groups in total). Each treatment group had 9 replicate worms, six of which were used for gene expression analysis. Worms were measured for their medial giant nerve fiber conduction velocity using a non-invasive electrophysiological technique immediately before takedown. At the termination of the 6-d or 13-d experiment, worms were snap-frozen and fixed in RNAlater-ICE. Total RNA was isolated from the fixed worms. A total of 24 worm RNA samples were hybridized to three 8x15K custom-designed Agilent oligo arrays using Agilentâs one-color Low RNA Input Linear Amplification Kit. The array contains 15,208 non-redundant 60-mer probes, each targeting a unique E. fetida transcript. After hybridization and scanning, gene expression data were acquired using GenePix Pro 6.0.
2009-10-14 | E-GEOD-18536 | biostudies-arrayexpress
Project description:Primary Objective : Compare the risk of occurrence of Grade3-4 cumulative peripheral sensory neuropathy (PSN) relative to cumulative dose of oxaliplatin between treatment group and placebo group.
Main Secondary Objective : Compare the response rate (RR) between treatment group and placebo group in order to ensure that the efficacy of the chemotherapy is not compromised by the addition of xaliproden to the chemotherapeutic regimen.
Other Secondary Objectives : study of the neurotoxicity parameters (Duration of oxaliplatin-induced PSN (G2,3,4); overall incidence of PSN during treatment; dose of onset of PSN ; incidence of dose-reduction and dose delay due to PSN; incidence of oxaliplatin treatment discontinuation due to PSN; change in Nerve Conduction Studies (NCS)) ; study of the safety profile (other than PSN) ; study of the chemotherapy efficacy (progression free survival, overall survival).
| 2027364 | ecrin-mdr-crc
Project description:The morbidity of colorectal cancer(CRC) is 10%～15% in China.mFolfox6 has become one of the standard regimes for metastatic colorectal cancer (mCRC). Neutropenia and oxaliplatin-induced neurotoxicity are the most common adverse effects which even result in discontinue of chemotherapy, especially for patients suffered from heavily acute neurotoxicity. Monosialotetrahexosylganglioside is a component of membrane of nerve cells. Previous phase II clinical trial showed, it can reduce oxaliplatin-induced neurotoxicity(OIN). But it did not certificated by phase III trial. Investigators designed the phase III trial to investigate the effect and safety of monosialotetrahexosylganglioside Sodium Injection for prevention OIN at colorectal cancer.
| 2157874 | ecrin-mdr-crc
Project description:Primary outcome(s): 1) The distinction of the neuropathic disorder type by oxaliplatin, paclitaxel by the examination of nerve conduction and nab paclitaxel and the comparison.
2) The predictability of the examination using the examination of nerve conduction DPN check for the neuropathy with the chemotherapy of nerve conduction or the vibratory sensation examination using the tuning fork system and validity.
| 2613063 | ecrin-mdr-crc
Project description:The earthworm Eisenia fetida is one of the most used species in standardized soil ecotoxicity tests. Endpoints such as survival, growth and reproduction are ecologically relevant but provide little mechanistic insight into the toxicity pathways, especially at the molecular level. To better understand toxicological modes of action and to facilitate the development of molecular biomarkers, we have obtained 30,245 unique EST sequences from E. fetida and have designed a novel microarray with 15,119 60-mer oligonucleotide probes. These probes target the unique non-redundant EST sequences identified in E. fetida. Using this array we have profiled gene expression of E. fetida after exposure to CL-20, a cage cyclic nitramine previously found exhibiting reversible neurotoxicity to worms. Worms were exposed for 6 days to CL-20. Half of the exposed worms were allowed to recover in a clean environment for 7 days. Electrophysiological analysis showed that the conduction velocity of worm medial giant nerve fiber was significantly decreased after 6-d exposure to CL-20, and that giant nerve fiber function was restored at the end of the 7-d recovery period. Total RNA samples isolated from four treatment groups (6 replicates per group), i.e., 6-d control, 6-d exposed, 13-d control and 6-d exposed with 7-d recovery, were analyzed using the new 15K oligo array. Bioinformatics and statistical analyses have identified specific neurological pathways affected by CL-20 and recovery of these pathways after CL-20 removal. These results provide significant insights on the CL-20 toxic mode of action and how earthworms can recover from chemical stressors.
2009-10-14 | GSE18536 | GEO
Project description:Defective mitochondrial dynamics underlie manganese-induced neurotoxicity
| PRJNA641207 | ENA
Project description:The primary objective of this study is to assess the efficacy of monosialotetrahexosylganglioside (GM1) for preventing oxaliplatin induced neurotoxicity in colorectal cancer patients who received oxaliplatin-based adjuvant chemotherapy.
| 2175298 | ecrin-mdr-crc
Project description:Background: Acrylamide (ACR) is a broadly spread neurotoxic chemical of public health concern, as occupational or environmental exposure of humans to ACR may lead to a synaptopathy characterized by ataxia, skeletal muscles weakness and numbness of the extremities. Currently, only the mildly affected patients undergo complete recovery, and identification of new molecules with therapeutic bioactivity against ACR acute neurotoxicity is urgently needed. Objectives: We aimed to develop a zebrafish model for human ACR neurotoxicity. Methods: Adverse effects have been assessed at different levels, including analysis of the motor function (basal locomotor activity, visual motor response, kinematic of the touch-evoked escape response), histopathological evaluation (toluidine blue and whole-mount immunofluorescence), analysis of neural transcriptional markers (qPCR), proteomic analysis (μLC-MS-MS) and neurotransmitters profile (LC-MS/MS). Results: Our results show that zebrafish mimics most of the pathophysiological processes described in humans and mammalian models. Motor function was altered, including the response to sudden changes in light intensity. Specific effects were found on the presynaptic nerve terminals at the neuromuscular junction level, but not on the axonal tracts or myelin sheath integrity. Transcriptional markers of proteins involved in synaptic vesicle cycle were selectively altered, and the proteomic analysis showed that ACR-adducts were formed on cysteine residues of some synaptic proteins. Finally, analysis of neurotransmitters profile showed a significant effect found on cholinergic and dopaminergic systems. Conclusions: Thus, the zebrafish model for ACR acute neurotoxicity is suitable to be used larvae for in vivo high-throughput screening of small molecule libraries for identifying new drugs against this synaptopathy.
2018-10-24 | PXD007169 | Pride
Project description:Permanent nerve damage caused by anesthesia is a rare but critical issue, and the mechanism of it remains unclear. Large-scale analysis of changes in noncoding RNA such as circRNA and microRNA in anesthesia-related nerve damage may provide insight into the mechanism of anesthesia-induced nerve injury.
2022-08-02 | GSE135297 | GEO
Project description:A major risk factor for glaucomatous optic neuropathy is the level of intraocular pressure (IOP), which can lead to retinal ganglion cell axon injury and cell death. The optic nerve has a rostral unmyelinated portion at the optic nerve head followed by a caudal myelinated region. The unmyelinated region is differentially susceptible to IOP-induced damage in rodent models and in human glaucoma. While several studies have analyzed gene expression changes in the mouse optic nerve following optic nerve injury, few were designed to consider the regional gene expression differences that exist between these distinct areas. We performed bulk RNA-sequencing on the retina and on separately micro-dissected unmyelinated and myelinated optic nerve regions from naïve C57BL/6 mice, mice after optic nerve crush, and mice with microbead-induced experimental glaucoma (total = 36). Gene expression patterns in the naïve unmyelinated optic nerve showed significant enrichment of the Wnt, Hippo, PI3K-Akt, and transforming growth factor β pathways, as well as extracellular matrix–receptor and cell membrane signaling pathways, compared to the myelinated optic nerve and retina. Gene expression changes induced by both injuries were more extensive in the myelinated optic nerve than the unmyelinated region, and greater after nerve crush than glaucoma. Changes present three and fourteen days after injury largely subsided by six weeks. Gene markers of reactive astrocytes did not consistently differ between injury states. Overall, the transcriptomic phenotype of the mouse unmyelinated optic nerve was significantly different from immediately adjacent tissues, likely dominated by expression in astrocytes, whose junctional complexes are inherently important in responding to IOP elevation.
2023-09-06 | GSE241782 | GEO