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Transcriptome profile of wildtype and Ret homozygote null male mouse guts at E10.5

ABSTRACT: Total mRNA seq was perfomed on widtype and Ret null male mouse embryonic gut at E10.5

ORGANISM(S): Mus musculus

PROVIDER: GSE99232 | GEO | 2018/04/01

REPOSITORIES: GEO

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Transcriptome profile of wildtype and Ret homozygote null mouse guts at E10.5 ,E12.5 and E14.5

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RNA-seq of RET-aberrant cancer cell lines treated with RET-TKI selpercatinib

Project description:RET-aberrant cancer discovered as a relevant targetable oncogene in several types of tumors, whose inhibitors have marked efficacy. However, some of patients with RET-aberrant cancer are insensitive to RET- tyrosine kinase inhibitors (TKIs) and are clinically non-responders. Recently, drug-tolerant mechanisms have been gaining attention as targets for initial therapies aimed at overcoming drug resistance. However, the underlying mechanisms of drug-tolerant cells emergence treated with RET-TKIs derived from RET-aberrant cancer cells remains unknown. In this study, HER3 signal activity through YAP1 was led to maintaining cell survival and inducing the emergence of cells tolerant to RET-TKIs selpercatinib and pralsetinib in high YAP1 expressed RET- rearranged cancer cells. These results suggested that YAP1-HER3 axis plays pivotal roles for cell survival under an exposure with RET-TKIs in the intrinsic resistance to RET-TKIs and the emergence of tolerant cells by RET-TKIs in YAP1 expressed RET-aberrant cancer, suggesting that YAP1/HER3 inhibition and RET-TKIs is a highly potent combination for initial treatment.

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RNA sequencing of mouse littermate wild-type and Shh null E10.5 forelimbs [Illumina]

Project description:We wanted to identify differentially expressed genes in wild-type and Shh null E10.5 mouse forelimbs

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RET fusion genes, BCR-RET and FGFR1OP-RET, are associated with chronic myelomonocytic leukemia, display sensitivity to Sorafenib, an inhibitor of tyrosine-kinase activity and enhance monocytic differentiation

Project description:Myeloproliferative neoplasms are frequently associated with aberrant constitutive tyrosine kinase (TK) activity resulting from point mutations or chimaeric fusion genes, such as BCR ABL1 or JAK2 V617F. We report here for the first time in hematological malignancies, two novel fusion genes involving the TK RET, BCR-RET and FGFR1OP-RET, in chronic myelo monocytic leukemia (CMML) cases. The two RET fusion genes lead to the aberrant activation of RET, are able to transform hematopoietic cells and skew the hematopoietic differentiation program towards the monocytic/macrophage lineage. We also report that the BCR-RET fusion protein is insensitive to Imatinib but sensitive to Sorafenib in vivo. CMML is an hematopoietic malignancy associated with the frequent activation of the RAS pathway. The RET fusion genes seems to constitutively mimic the same signaling pathway than RAS mutations. Overall, the RET fusion genes behaviors in the monocytic lineage underlie the role of the normal RET TK activity during the physiological monocytic differentiation. We analysed BAF/3 cells infected by BCR-RET, FGFR1OP-RET or BCR-ABL1P210 fusion genes retroviruses and sorted out using EGFP fluorescence, with Affymetrix GeneChip MouseGene 1.0 ST platform.

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Expression anlysis of E10.5 yolk sac and E13.5 liver lineages from the wildtype mouse embryo

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Project description:Adjacent stroma, including subepithelial fibroblasts, are believed to coordinate the differentiation process of epithelial cells, but the mechanisms are not well understood. Glial cell line-derived neurotrophic factor (GDNF) is expressed in the intestinal Pdgfra high subepithelial myofibroblasts (SEMFs), while the GDNF receptor RET is expressed in a subset of enteroendocrine cells (EECs), indicating regulatory crosstalk. In this experiment, single RET+ intestinal cells were sorted the gene expression profile was compared to non-RET cells. This provided knowledge about RET+ cell types. RET+ cells were upregulated with most of the EEC markers, indicating that RET+ cells are expressed in EECs. We also observed the differences in the gene expression profile of stromal-derived GDNF ligand on intestinal organoids. Organoids were derived from intestinal crypts of WT mice C57BL/6J and treated with 500ng/ml of Gdnf and Gfra1. GDNF-treated organoids induced the expression of EEC genes such as Pyy, Tac1, Tph1, and Cck, indicating enhanced differentiation of EC cell and L-I-N cell lineages. This highlights a stroma-epithelium crosstalk pathway regulating the differentiation of intestinal EEC subtypes.

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Loss of RET promotes mesenchymal identity in neuroblastoma cells

Project description:Aberrant activation of Anaplastic Lymphoma Kinase (ALK) drives neuroblastoma (NB). Previous work has identified the RET receptor tyrosine kinase (RTK) as a downstream target of ALK activity in NB models. We show here that ALK activation in response to ALKAL2 ligand results in the rapid phosphorylation of RET in NB cells, providing additional insight into the contribution of RET to the ALK driven gene signature in NB. To further address the role of RET in NB, RET knock-out (KO) SK-N-AS cells were generated by CRISPR/Cas9 genome engineering. Gene expression analysis of RET KO NB cells identified a reprogramming of NB cells to a mesenchymal (MES) phenotype that was characterized by increased migration and upregulation of the AXL and MET RTKs as well as integrins and extracellular matrix components. Strikingly, the upregulation of AXL in the absence of RET reflects the development timeline observed in the neural crest as progenitor cells undergo differentiation during embryonic development. Together, these findings suggest that a MES phenotype is promoted in mesenchymal NB cells in the absence of RET, reflective of a less differentiated developmental status.

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