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Hepatic Lysosomal Acid Lipase Overexpression Worsens Hepatic Inflammation in Mice Fed a Western Diet

ABSTRACT: Hepatic Lysosomal Acid Lipase Overexpression Worsens Hepatic Inflammation in Mice Fed a Western Diet

PROVIDER: PRJNA748030 | ENA |

REPOSITORIES: ENA

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Hepatic Lysosomal Acid Lipase Overexpression Worsens Hepatic Inflammation in Mice Fed a Western Diet

Project description:Non-alcoholic fatty liver disease (NAFLD) is characterized by the accumulation of lipid droplets (LD) in hepatocytes. NAFLD development and progression is associated with an increase in hepatic cholesterol and decreased autophagy and lipophagy flux. Previous studies have shown that the expression of lysosomal acid lipase (gene=LIPA, protein=LAL), which can hydrolyze both triglyceride and cholesteryl esters, is inversely correlated with the severity of NAFLD. In addition, ablation of LAL activity results in profound NAFLD. Based on this, we predicted that overexpressing LIPA in the livers of mice fed a Western diet (FPC) would prevent the development of NAFLD. As expected, mice fed the FPC diet exhibited numerous markers of NAFLD including hepatomegaly, lipid accumulation, and inflammation. Unexpectedly, LAL overexpression did not attenuate steatosis and had only minor effects on neutral lipid composition. However, LAL overexpression exacerbated inflammatory gene expression and infiltration of immune cells in mice fed the FPC diet. LAL overexpression also resulted in abnormal phagosome accumulation and lysosomal lipid accumulation depending upon the dietary treatment. Hepatic overexpression of LAL drove immune cell infiltration and inflammation and did not attenuate the development of NAFLD suggesting that targeting LAL expression is not a viable route to treat NAFLD.

2021-11-03 | GSE180377 | GEO

Hepatic lysosomal acid lipase overexpression worsens hepatic inflammation in mice fed a Western diet.

Project description: Not available

| S-EPMC8556525 | biostudies-literature

Gene profile of Myeloid derived Suppressive Cells from the Bone Marrow of Lysosomal Acid Lipase Knock-out Mice

Project description:Expression profile of MDSC isolated from Bone marrow of lysosomal acid Lipase mice compared to the WT counterpart four samples

2012-03-06 | E-GEOD-29401 | biostudies-arrayexpress

Gene profile of Myeloid derived Suppressive Cells from the Bone Marrow of Lysosomal Acid Lipase Knock-out Mice

Project description:Expression profile of MDSC isolated from Bone marrow of lysosomal acid Lipase mice compared to the WT counterpart

2012-03-06 | GSE29401 | GEO

Pronounced metabolic alterations and susceptibility to inflammation, fibrosis, and cancer in livers from lysosomal acid lipase-deficient mice

Project description:Lysosomal acid lipase (LAL) is the sole lysosomal enzyme responsible for the degradation of cholesteryl esters and triacylglycerols at acidic pH. Impaired LAL activity leads to LAL deficiency (LAL-D), a severe and fatal disease characterized by ectopic lysosomal lipid accumulation. Reduced LAL activity also contributes to the development and progression of non-alcoholic fatty liver disease (NAFLD). To advance our understanding of LAL-related liver pathologies, we performed comprehensive proteomic profiling of livers from mice with systemic genetic loss of LAL (Lal-/-) and from mice with hepatocyte-specific LAL-D (hepLal-/-). Lal-/- mice exhibited drastic proteome alterations, including dysregulation of multiple proteins related to metabolism, inflammation, liver fibrosis, and cancer. Global loss of LAL activity impaired both acidic and neutral lipase activities and resulted in hepatic lipid accumulation, indicating a complete metabolic shift in Lal-/- livers. Hepatic inflammation and immune cell infiltration were evident, with numerous upregulated inflammation-related gene ontology biological process terms. In contrast, both young and mature hepLal-/- mice displayed only minor changes in the liver proteome, suggesting that loss of LAL solely in hepatocytes does not phenocopy metabolic alterations observed in mice globally lacking LAL. These findings provide valuable insights into the mechanisms underlying liver dysfunction in LAL-D and may help in understanding why decreased LAL activity contributes to NAFLD. Our study highlights the importance of LAL in maintaining liver homeostasis and demonstrates the drastic consequences of its global deficiency on the liver proteome and liver function.

2023-10-24 | PXD042478 | Pride

Off-target effects of the lysosomal acid lipase inhibitors Lalistat-1 and Lalistat-2 on neutral lipid hydrolases

Project description:Lysosomal acid lipase (LAL) is the key enzyme of lysosomal lipid hydrolysis, which degrades cholesteryl esters (CE), triacylglycerols (TG), diacylglycerols (DG), and retinyl esters. The role of LAL in various cellular processes has mostly been studied in LAL-deficient (Lal-/-) mice, which share phenotypical characteristics with humans suffering from LAL deficiency. In vitro, the cell-specific functions of LAL have been commonly investigated by using the LAL inhibitors Lalistat-1 (L1) and Lalistat-2 (L2). Here, we show that pharmacological LAL inhibition but not genetic loss of LAL impairs isoproterenol-stimulated lipolysis and neutral TG hydrolase (TGH) and CE hydrolase (CEH) activities in mature adipocytes, indicating that L1 and L2 inhibit other lipid hydrolases apart from LAL. Since adipose triglyceride lipase (ATGL) and hormone-sensitive lipase (HSL) are the major enzymes that degrade cytosolic TG and CE, respectively, at neutral pH, we hypothesized that L1 and L2 also inhibit ATGL and/or HSL through off-target effects. In fact, both inhibitors drastically reduced neutral CEH activity in cells overexpressing mouse and human HSL and neutral TGH activity in cells overexpressing mouse and human ATGL, albeit to a lesser extent. By performing serine hydrolase-specific activity-based labeling in combination with quantitative proteomics, we confirmed that L2 inhibits HSL and other lipid hydrolases, whereas L1 treatment results in less pronounced inhibition of neutral lipid hydrolases. These results demonstrate that commonly used concentrations of L2 (and L1) are not suitable for investigating the role of LAL-specific lipolysis in lysosomal function, signaling pathways, and autophagy.

2022-05-13 | PXD030672 | Pride

Identification of Lysosomal Acid Lipase A as a Novel Molecular Vulnerability in Triple Negative Breast Cancer

Project description:Identification of Lysosomal Acid Lipase A as a Novel Molecular Vulnerability in Triple Negative Breast Cancer

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Hepatic gene expression in wild type and SHPKO mice fed chow or western diet

Project description:SHP (small heterodimer partner; NR0B2) belongs to the nuclear hormone receptor superfamily, which regulates numerous developmental and metabolic cellular functions. To study physiological function of SHP, we generated congenic SHP-/- mice on C57Bl/6 background. When the congenic SHP-/- mice were challenged with a western diet (harlan, TD.88137) for 22 weeks, they were resistant to diet induced obesity and hepatic steatosis compared to WT controls. However, their hepatic insulin sensitivity was compromised when assessed with phospho-Akt levels after insulin injection. Therefore, we investigated hepatic gene expression using illumina beadchip array to explore mechanisms underneath the unique liver physiology in SHP-/- mice. Livers were collected from C57Bl/6 wild type and C57Bl/6 SHP-/- mice fed chow or western diet. The 1 microgram of total RNA obtained from individual mouse (n=4 per group) and subjected to illumina beadchip gene expression profiling.

2012-05-16 | E-GEOD-38013 | biostudies-arrayexpress

Hepatic gene expression in wild type and SHPKO mice fed chow or western diet

2012-05-17 | GSE38013 | GEO

Changes in hepatic transcriptome profile in α4β7 mAb-treated Western diet-fed mice

Project description:Hepatic transcriptome of junctional adhesion molecule A knockout, F11r–/– mice fed a Western diet (WD) for eight weeks. A cohort of WD-fed mice were treated with IgG or α4β7 mAb for four weeks starting at week four following initiation of the WD.

2022-04-21 | GSE149208 | GEO

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