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Propargite, an environmental chemical, interacts with GWAS identified diabetes genes to impact human pancreatic β-cell death [PTPN2 knockout]

ABSTRACT: This paper describes the first time a high-content environmental chemicals screen using pancreatic β-like cells derived from human pluripotent stem cells (hPSCs), and discovered that a commonly used pesticide, propargite, induces pancreatic β-cell DNA damage and necrosis. More interestingly, we found out the genetic background of β-like cells affects their response to propargite-induced toxicity, based on isogenic hPSC platform, including for variants GWAS identified associated with T1D, since isogenic GSTT1-/- and PTPN2-/- pancreatic β-like cells are hypersensitive to propargite-induced β-cell death both in vitro and in vivo. In summary, our study identified an environmental chemical that contributes to the loss of β-cells and provides an innovative platform for using hPSC-derived cells to explore gene-environment interactions that impact diabetes disease progression.

ORGANISM(S): Homo sapiens

PROVIDER: GSE83781 | GEO | 2018/07/01

REPOSITORIES: GEO

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Propargite, an environmental chemical, interacts with GWAS identified diabetes genes to impact human pancreatic β-cell death [propargite treatment]

Project description:This paper describes the first time a high-content environmental chemicals screen using pancreatic β-like cells derived from human pluripotent stem cells (hPSCs), and discovered that a commonly used pesticide, propargite, induces pancreatic β-cell DNA damage and necrosis. More interestingly, we found out the genetic background of β-like cells affects their response to propargite-induced toxicity, based on isogenic hPSC platform, including for variants GWAS identified associated with T1D, since isogenic GSTT1-/- and PTPN2-/- pancreatic β-like cells are hypersensitive to propargite-induced β-cell death both in vitro and in vivo. In summary, our study identified an environmental chemical that contributes to the loss of β-cells and provides an innovative platform for using hPSC-derived cells to explore gene-environment interactions that impact diabetes disease progression.

2018-07-01 | GSE83699 | GEO

PTPN2 regulates metabolic flux to affect beta cell susceptibility to inflammatory stress

Project description:Protein tyrosine phosphatase N2 (Ptpn2) is a type 1 diabetes (T1D) candidate gene identified from human genome-wide association studies. PTPN2 is highly expressed in human and murine islets and becomes elevated upon inflammation, suggesting that PTPN2 may be important for beta cell survival in the context of T1D. To test whether PTPN2 contributed to beta cell dysfunction in an inflammatory environment, we generated a beta cell-specific deletion of Ptpn2 in mice (Ptpn2 βKO). While unstressed animals exhibit normal metabolic profiles, streptozotocin (STZ) Ptpn2 βKO mice display marked increase in hyperglycemia and death due to exacerbated beta cell loss. Furthermore, cytokine treated Ptpn2 KO islets resulted in mitochondrial defects and reduced glucose-induced metabolic flux, suggesting beta cells lacking Ptpn2 are more susceptible to inflammatory stress associated with T1D due to compromised metabolic fitness.

2023-12-01 | GSE215852 | GEO

Unravelling the Biological Functions of Type 1 Diabetes Associated Noncoding Single-Nucleotide Polymorphism in Human Pancreatic β Cells

Project description:Over 90% of disease associated single nucleotide polymorphisms (SNPs) identified by genome wide association studies (GWAS) are noncoding variants. Platform to efficiently validate the biological function of variants thus discovered remain distinctly lacking. Here, we used β-like cells derived from isogenic human pluripotent stem cells (hPSCs), carrying the type 1 diabetes (T1D)-associated noncoding SNP rs2542151T>G or the knockout of the SNP-associated gene PTPN2−/−, to systematically examine the role of the T1D associated noncoding variant in β cell function and survival. PTPN2−/− and rs2542151T>G both decrease insulin production and elevate cell apoptosis in vitro as well as in vivo. A high content chemical screen identified sodium butyrate, a short-chain fatty acid, to rescue the defects of PTPN2−/−and rs2542151G/G β-like cells in vitro and a humanized mouse model. The combined phosphoproteomics, proteomics and RNA-seq analyses discovered a LAMIN A/HDAC/ERK/complex 1 axis as the downstream pathway of PTPN2 to control β cell survival. Together, this study proved the principle to apply hPSC-derived β cells to study diabetes associated noncoding SNP, and identified a drug candidate for the precision therapy of T1D.

2021-03-22 | GSE166785 | GEO

Differential gene expression in WT mice and mice lacking PTPN2 in T cells

Project description:WT mice and mice lacking PTPN2 in T cells (PTPN2-CD4Cre mice) were treated with AOM/DSS to induce colorectal tumours. RNA was isolated from tumour and non-tumour tissues in the colon. Colon samples from water-treated WT and PTPN2-CD4Cre mice served as additional control. Total RNA was isolated and the samples sequenced for polyA enriched RNA.

2020-10-03 | E-MTAB-9629 | biostudies-arrayexpress

PTPN2 knockout vs WT

Project description:We generated pluripotent stem cells (Mel1 hESC containing a GFP reporter driven by the endogenous insulin promoter) with a functional knock out of PTPN2 by CRISPR/Cas9 genome editing. KO or WT control stem cells were differentiated into beta-like cells (sBC), sorted for GFP, and prepared for deep sequencing.

2022-11-30 | GSE211636 | GEO

RNA sequencing of control and PTPN2 knocked down transcriptomes in EndoC- H1 cells with or without the treatment of pro-inflammatory cytokines

Project description:Type 1 diabetes (T1D) results from autoimmune destruction of β-cells in the pancreas. Protein tyrosine phosphatases (PTPs) are candidate genes for T1D and play a key role in autoimmune disease development and β-cell function. Here, we assessed the global protein and individual PTP profile in the pancreas from diabetic NOD mice treated with anti-CD3 monoclonal antibody and IL-1 receptor antagonist (IL-1RA). The treatment reversed hyperglycemia compared to the anti-CD3 alone control group. We observed enhanced expression of PTPN2, a T1D candidate gene, and endoplasmic reticulum (ER) chaperones in islets from mice with reversed diabetes. To address the functional role of PTPN2 in β-cells, we generated PTPN2 deficient stem cell-derived β-like and human EndoC-βH1 cells. Mechanistically, we demonstrated that PTPN2 inactivation in β-cells exacerbates the type I and type II IFN signalling networks, and the potential progression towards autoimmunity. Moreover, we established the capacity of PTPN2 to modulate the Ca2+-dependent unfolded protein response in β-cells. Adenovirus-induced overexpression of PTPN2 decreased BiP expression and partially protected from ER-stress induced β-cell death. Our results postulate PTPN2 as a key protective factor in β-cells during inflammation and ER stress in autoimmune diabetes.

2022-01-21 | GSE172148 | GEO

Loss-of-function of PTPN2 promotes pathogenic loss of FoxP3+ in RORgt+ Tregs [ATAC-seq]

Project description:Genetic variants at the PTPN2 locus, which encodes the tyrosine phosphatase PTPN2, cause reduced gene expression and are linked to rheumatoid arthritis (RA) and other autoimmune diseases. PTPN2 inhibits signaling through the T cell and cytokine receptors and loss of PTPN2 promotes T cell expansion and CD4 and CD8-driven autoimmunity. However, it remains unknown whether loss of PTPN2 in FoxP3+ regulatory T cells (Treg) plays a role in autoimmunity. Here we show that a reduction in Ptpn2 expression, comparable to that reported in human carriers of autoimmune-predisposing PTPN2 variants, unexpectedly enhances the severity of autoimmune arthritis through a Treg-intrinsic mechanism. Mechanistically, we found that through dephosphorylation of STAT3, Ptpn2 inhibits IL-6-driven pathogenic loss of FoxP3 after Tregs have acquired RORgt expression, at a stage when chromatin accessibility for STAT3-targeted IL-17 associated transcription factors is maximized. We conclude that PTPN2 promotes FoxP3 stability in RORgt+ Treg and that loss of function of PTPN2 in Treg contributes to the association between PTPN2 and autoimmunity.

2019-03-18 | GSE123486 | GEO

Loss-of-function of PTPN2 promotes pathogenic loss of FoxP3+ in RORgt+ Tregs [RNA-seq]

2019-03-18 | GSE123484 | GEO

HDX-MS analysis of PTPN2 with the CRBN/DDB1 complex

Project description:We used HDX-MS analysis to analyze the interaction between PTPN2 with a compound both in the presence and absence of the CRBN/DDB1 complex. We identified significant changes in HDX when PTPN2 was in the presence of compound. We also identified significant changes when comparing the deuteration profiles of PTPN2 in the presence of compound with and without the CRBN/DDB1 complex.

2024-08-23 | PXD053867 | Pride

Targeted transcriptome analysis of isolated intestinal epithelial cells from mice with constitutive Ptpn2-deficiency

Project description:Background & aims: Loss-of-function variants in the PTPN2 gene are associated with increased risk of inflammatory bowel disease. We recently showed that Ptpn2 is critical for intestinal epithelial cell (IEC) barrier maintenance, IEC-macrophage communication, and modulation of the gut microbiome in mice, restricting expansion of a small intestinal pathobiont associated with inflammatory bowel disease. Here, we aimed to identify how Ptpn2 loss affects ileal IEC subtypes and their function in vivo. Methods: Constitutive Ptpn2 wild-type, heterozygous, and knockout (KO) mice, as well as mice with inducible deletion of Ptpn2 in IECs, were used in the study. Investigation was performed using imaging techniques, flow cytometry, enteroid culture, and analysis of gene and protein levels of IEC markers. Results: Partial transcriptome analysis showed that expression of Paneth cell-associated antimicrobial peptides Lyz1, Pla2g2a, and Defa6 was down-regulated markedly in Ptpn2-KO mice compared with wild-type and heterozygous. In parallel, Paneth cell numbers were reduced, their endoplasmic reticulum architecture was disrupted, and the endoplasmic reticulum stress protein, C/EBP-homologous protein (CHOP), was increased in Ptpn2-KO mice. Despite reduced Paneth cell number, flow cytometry showed increased expression of the Paneth cell-stimulatory cytokines interleukin 22 and interferon γ+ in CD4+ T cells isolated from Ptpn2-KO ileum. Key findings in constitutive Ptpn2-KO mice were confirmed in epithelium-specific Ptpn2ΔIEC mice, which also showed impaired lysozyme protein levels in Paneth cells compared with Ptpn2fl/fl control mice. Conclusions: Constitutive Ptpn2 deficiency affects Paneth cell viability and compromises Paneth cell-specific antimicrobial peptide production. The observed effects may contribute to the increased susceptibility to intestinal infection and dysbiosis in these mice.

2023-04-10 | GSE181923 | GEO

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