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Role of AhR in thymocyte emigration in vivo

ABSTRACT: Over-activation of the aryl hydrocarbon receptor by TCDD in mice leads among other phenotypes to a severe thymic atrophy accompanied by immunosuppression. TCDD causes a block in thymocyte maturation and a preferential emigration of immature CD4-CD8- DN thymocytes (recent thymic emigrants) into the periphery. As part of this study gene expression profiles from DN thymocytes and thymic emigrants were generated from TCDD and solvent control mice Keywords: Affymetrix, TCDD, CD4-CD8- thymocytes, Thymus involution, thymic emigration, Ahr

ORGANISM(S): Mus musculus

PROVIDER: GSE10166 | GEO | 2008/11/25

SECONDARY ACCESSION(S): PRJNA108365

REPOSITORIES: GEO

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Role of AhR in thymocyte emigration in vivo

Project description:Over-activation of the aryl hydrocarbon receptor by TCDD in mice leads among other phenotypes to a severe thymic atrophy accompanied by immunosuppression. TCDD causes a block in thymocyte maturation and a preferential emigration of immature CD4-CD8- DN thymocytes (recent thymic emigrants) into the periphery. As part of this study gene expression profiles from DN thymocytes and thymic emigrants were generated from TCDD and solvent control mice Keywords: Affymetrix, TCDD, CD4-CD8- thymocytes, Thymus involution, thymic emigration, Ahr Female, 6-8 week old C57BL6 mice were i.p. injected with 10 M-BM-5g/kg TCDD. After 5 days mice were anesthezised and FITC injected into their thymi. after 24h mice were sacrificed and CD4-CD8-FITC+ cells isolated from thymus (thymocytes) and spleen (recent thymus emigrants).

2008-11-25 | E-GEOD-10166 | biostudies-arrayexpress

AHR mediated gene expression changes in immature DN thymocytes and thymic emigrants

Project description:Effect of an immunosupressive dose of TCDD, a ligand for the aryl hydrocarbon receptor, on the gene expression profile of fetal DN thymocytes and thymic emigrants C57BL6 mice were mated and the pregnant dams sacrifice at day 15 of gestation. Fetal thymic lobes were prepared and cultured for 6 days on culture inserts (5-6 lobes/culture insert). Medium, containing either 10 nM TCDD or solvent control was exchanged every 48 hours. At day six (gestation day 21, corresponding to birth), single cell suspensions of the thymocytes were prepared and CD4-CD8- cells isolated by MACS sorting. Purity of the population was checked FACS analysis, to be greater 95%. RNA was purified (TRIZOL), amplified (Ambion Kit) and processed (Affymetrix standard protocol) according to manufacturers instructions. Raw cell files were processed with the bioconductor affy package

2008-11-25 | E-GEOD-13720 | biostudies-arrayexpress

AHR mediated gene expression changes in immature DN thymocytes and thymic emigrants

Project description:Effect of an immunosupressive dose of TCDD, a ligand for the aryl hydrocarbon receptor, on the gene expression profile of fetal DN thymocytes and thymic emigrants

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METTL3 governs thymocyte development and thymic involution by regulating ferroptosis

Project description:Given its central role in immune aging, identifying regulators of thymic involution is important. While conventional programmed cell death plays a fundamental role in thymocyte development, how cell death pathways contribute to thymic involution remains unclear. In this study, we found that CD4+CD8+ double positive (DP) thymocytes acquired characteristics of senescence in aged mice undergoing thymic involution, while expression of the m6A methyltransferase METTL3 (enriched in DP cells from young mice) decreased with aging. By conditionally deleting METTL3 in T cells, we revealed a critical role for METTL3 in DP cell survival, and in restraining features of aging in DP thymocytes by preventing ferroptosis signaling, through glutathione peroxidase 4 (GPX4). Mechanistically, GPX4 was maintained by METTL3 at the translational level, independent of its methyltransferase activity. Furthermore, we found that pharmacological inhibition of ferroptosis promoted DP cell survival, and attenuate d features of aging in DP thymocytes. These findings uncover a role for METTL3-regulated ferroptosis in thymic involution, and identify strategies to restore thymic function.

2024-08-18 | GSE271324 | GEO

Gene expression analysis of thymocyte subsets

Project description:Mouse thymocytes can be classified into four major subsets based on expression of CD4 and CD8 co-receptors. CD4-CD8- (double negative, DN) cells become CD4+CD8+ (double positive, DP) cells following productive T cell receptor (TCR) beta chain rearrangement. A small proportion of DP cells are selected through interaction of clonal TCRalpha/beta and MHC self peptide complex expressed on thymic stromal cells. DP cell expressing MHC class I-restricted TCR become CD4-CD8+ cells, which will finally differentiate into cytotoxic T cells, while MHC class II restricted selection generates CD4+CD8- helper lineage T cells. We used microarrays to identify genes important for thymocyte differentiation and lineage determination by profiling gene expression in different thymocyte subsets. Mouse thymocytes were divided into four subsets based on CD4, CD8a, and TCRb expression and purified by flw cytometry. FACS purified DN (CD4-CD8a-TCRb-), DP (CD4+CD8a+), CD4SP (CD4+CD8a-TCRbhi) and CD8SP (CD4-CD8a+TCRbhi) populations were lysed in Trizol, and provided to the Genomics Core Facility of the Memorial Sloan-Kettering Cancer Center (MSKCC) for quality control, quantification, reverse transcription, labeling and hybridization to MOE430A 2.0 microarray chips (Affymetrix). Arrays were scanned per the manufacturer’s specifications for the Affymetrix MOE430v2 chip.

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Project description:Subpopulations of human fetal thymocyte and circulating naïve T cells were obtained through FACS sorting, including CD3-CD4+CD8- intrathymic T progenitor cells (ITTP), CD3intCD4+CD8+ "double positive" thymocytes (DP), CD3highCD4+CD8- "single positive" thymocytes (SP4), CD3+CD4+CD8-CD45RA+CD62L+ naïve T cells from cord blood (CB4+), and CD3+CD4+CD8-CD45RA+CD62L+ naïve T cells from adult blood (AB4+). Keywords = Microarray Keywords = gene expression Keywords = thymocytes Keywords = naïve CD4+ T cell Keywords = recent thymic emigrants Keywords: other

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scRNAseq in Pten enhancer wild-type or deleted thymocytes, enriched for immature thymocyte stages (CD4-CD3-)

Project description:Single cell suspensions of total thymocytes were obtained from Pten enhancer (PE) wild-type or knockout mice. This single-cell suspension was enriched in CD4-CD3- immature thymocyte progenitor cells. CD4-CD3- enriched thymocytes were then mixed 1:1 with single-cell suspensions from total unenriched thymocytes and subsequntly loaded in a 10x Chromium instrument for single-cell RNAseq analyses. Our results revealed Pten levels are signifcantly decreased in CD4-CD8- double negative (DN) thymocytes, CD8+ intermediate single positive (ISP) thymocytes and CD4+CD8+ double positive (DP) thymocytes in PE knockout mice, compared to PE wild-type mice.

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