Project description:In type 1 diabetes (T1D), the innate and adaptive immune systems attack and eventually destroy the insulin-secreting islet β cells. During this process, β cells activate inflammatory signaling pathways that augment the dysfunction and destruction imposed by cellular autoimmunity. The 12-lipoxygenase (12-LOX) pathway produces the pro-inflammatory eicosanoid 12-HETE, which induces oxidative and endoplasmic reticulum stress and results in diminished insulin secretion and apoptosis. The G protein-coupled receptor 31 (GPR31) has been identified as a putative receptor for 12-HETE. In this study, we generated conventional GPR31 knockout mice. To interrogate the role of GPR31 in β cells, we treated islets from wildtype and Gpr31b-/- mice with proinflammatory cytokines and subjected the islets to RNA sequencing. Differentially expressed genes in Gpr31b-/- islets included those pertaining to receptor signaling, inflammation, oxidative stress, and macrophage migration — effects that are reminiscent of 12-LOX inhibition. Bone-marrow derived macrophages from Gpr31b-/- mice had reduced macrophage migration compared to wildtype macrophages. To mimic islet and macrophage inflammation as seen in T1D, wildtype and Gpr31b-/- mice were treated with the pro-diabetic toxin streptozotocin. Compared to wildtype, Gpr31b-/- mice had improved glucose tolerance and preserved β-cell mass. These results are consistent with previously published data using 12-LOX knockout mice and suggests that GPR31 mediates the proinflammatory responses of 12-HETE in the β cell.
Project description:We report that the decreased expression of mitochondrial genes we observe in hepatocyte-specific Nampt knockout mice is normalized in primary hepatocytes, and that hepatocyte isolations causes major changes to the hepatocyte transcriptome for both knockouts and wildtype mice.
Project description:Autophagy regulated 14 (ATG14) is a key regulator of autophagy; however, its role in the liver remains poorly understood. This study aimed to investigate the hepatocyte-specific function of ATG14 in vivo. We generated Atg14 hepatocyte-specific knockout (HepKO) mice using adeno-associated virus (AAV) to deliver thyroxine-binding globulin (TBG) gene promoter-driven Cre into Atg14 floxed mice at an adult age and fed control and knockout mice with a Western diet for 4 weeks.
2025-05-07 | GSE296179 | GEO
Project description:MeRIP-seq analysis of liver tissues from hepatocyte-specific NSUN2 knockout mice
Project description:Gp130 dependent gene expression was analyzed in a previously established hepatocyte-specific gp130-knockout mouse model. Whole transcriptome analysis for isolated hepatocytes was performed to measure tissue specific responses after proinflammatory stimulus with IL-6 across different time points. We observed differences in the hepatocyte-specific transcriptional gp130 dependent response for genes associated with different aspects of the innate immune system. Our findings suggest a complex network of tightly-linked genes involved in the early activation of different parts of the innate immune response including acute phase proteins, complement and coagulation cascade. Total RNA obtained from a total number of 61 samples of isolated hepatocytes of hepatocyte-specific gp130-knockout and gp130flox mice, which were subjected to Il-6 treatment for 0, 1, 3, 6 or 12 hours, respectively.
Project description:Unperturbed cholesterol homeostasis is important for normal development and sexual maturation in mice. Cyp51 is the rate limiting step in the post-lanosteorl part of cholesterol biosynthesis. Unlike the full body knockout, hepatocyte specific Cyp51 knockout mice survive throughout adulthood, however their livers are severly affected. Several of the hepatocyte specific Cyp51 knockout mice develop severe liver injury or die prior to reaching adulthood (from 4-10 weeks of age; designated as runts). We aim to uncover the timing and the mechanistic background governing the liver damage and sex differences. Hepatocyte-specific Cyp51 knockout and wild type mice on a mixed background (129/Pas (10%) × C57BL/6J (90%)) of both sexes (F and M) were investigated at the pre pubertal (3 weeks), late pubertal (6 weeks) and adult (19 weeks) stage of development. This age span allows us to also observe the impact of sexual maturation on the disease development, as the liver is one of the most sexually dimorphic non-reproductive organs. Runt mice were evaluated to differentiate them from the other KO mice with milder conditions.
Project description:RNA sequencing of primary hepatocytes from Control and and hepatocyte-specific Mettl3 knockout with ALB-Cre (Mettl3 cKO) mice after Actinomycin D treatment.