1
|
Wilhelmsen I, Combriat T, Dalmao-Fernandez A, Stokowiec J, Wang C, Olsen PA, Wik JA, Boichuk Y, Aizenshtadt A, Krauss S. The effects of TGF-β-induced activation and starvation of vitamin A and palmitic acid on human stem cell-derived hepatic stellate cells. Stem Cell Res Ther 2024; 15:223. [PMID: 39044210 PMCID: PMC11267759 DOI: 10.1186/s13287-024-03852-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Accepted: 07/14/2024] [Indexed: 07/25/2024] Open
Abstract
BACKGROUND Hepatic stellate cells (HSC) have numerous critical roles in liver function and homeostasis, while they are also known for their importance during liver injury and fibrosis. There is therefore a need for relevant in vitro human HSC models to fill current knowledge gaps. In particular, the roles of vitamin A (VA), lipid droplets (LDs), and energy metabolism in human HSC activation are poorly understood. METHODS In this study, human pluripotent stem cell-derived HSCs (scHSCs), benchmarked to human primary HSC, were exposed to 48-hour starvation of retinol (ROL) and palmitic acid (PA) in the presence or absence of the potent HSC activator TGF-β. The interventions were studied by an extensive set of phenotypic and functional analyses, including transcriptomic analysis, measurement of activation-related proteins and cytokines, VA- and LD storage, and cell energy metabolism. RESULTS The results show that though the starvation of ROL and PA alone did not induce scHSC activation, the starvation amplified the TGF-β-induced activation-related transcriptome. However, TGF-β-induced activation alone did not lead to a reduction in VA or LD stores. Additionally, reduced glycolysis and increased mitochondrial fission were observed in response to TGF-β. CONCLUSIONS scHSCs are robust models for activation studies. The loss of VA and LDs is not sufficient for scHSC activation in vitro, but may amplify the TGF-β-induced activation response. Collectively, our work provides an extensive framework for studying human HSCs in healthy and diseased conditions.
Collapse
Affiliation(s)
- Ingrid Wilhelmsen
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway.
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway.
| | - Thomas Combriat
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Andrea Dalmao-Fernandez
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
- Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, Oslo, 0316, Norway
| | - Justyna Stokowiec
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Chencheng Wang
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
- Department of Transplantation Medicine, Institute for Surgical Research, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
| | - Petter Angell Olsen
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Jonas Aakre Wik
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Yuliia Boichuk
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Aleksandra Aizenshtadt
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| | - Stefan Krauss
- Department of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, Nydalen, Oslo, 0424, Norway
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1110, Blindern, Oslo, 0317, Norway
| |
Collapse
|
2
|
Czuba LC, Isoherranen N. LX-2 Stellate Cells Are a Model System for Investigating the Regulation of Hepatic Vitamin A Metabolism and Respond to Tumor Necrosis Factor α and Interleukin 1 β. Drug Metab Dispos 2024; 52:442-454. [PMID: 38485281 PMCID: PMC11023816 DOI: 10.1124/dmd.124.001679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/05/2024] [Indexed: 04/18/2024] Open
Abstract
Hepatic stellate cells (HSCs) are the major site of vitamin A (retinol) esterification and subsequent storage as retinyl esters within lipid droplets. However, retinyl esters become depleted in many pathophysiological states, including acute and chronic liver injuries. Recently, using a liver slice culture system as a model of acute liver injury and fibrogenesis, a time-dependent increase and decrease in the apparent formation of the bioactive retinoid all-trans-retinoic acid (atRA) and retinyl palmitate was measured, respectively. This coincided with temporal changes in the gene expression of retinoid-metabolizing enzymes and binding proteins, that preceded HSC activation. However, the underlying mechanisms that promote early changes in retinoid metabolism remain unresolved. We hypothesized that LX-2 cells could be applied to investigate differences in quiescent and activated HSC retinoid metabolism. We demonstrate that the hypermetabolic state of activated stellate cells relative to quiescent stellate cells may be attributed to induction of STRA6, RBP4, and CYP26A1, thereby reducing intracellular concentrations of atRA. We further hypothesized that paracrine and autocrine cytokine signaling regulates HSC vitamin A metabolism in both quiescent and activated cells. In quiescent cells, tumor necrosis factor α dose-dependently downregulated LRAT and CRBP1 mRNA, with EC50 values of 30-50 pg/mL. Likewise, interleukin-1β decreased LRAT and CRBP1 gene expression but with less potency. In activated stellate cells, multiple enzymes were downregulated, suggesting that the full effects of altered hepatic vitamin A metabolism in chronic conditions require both paracrine and autocrine signaling events. Further, this study suggests the potential for cell type-specific autocrine effects in hepatic retinoid signaling. SIGNIFICANCE STATEMENT: HSCs are the major site of vitamin A storage and important determinants of retinol metabolism during liver fibrogenesis. Here, two LX-2 culture methods were applied as models of hepatic retinoid metabolism to demonstrate the effects of activation status and dose-dependent cytokine exposure on the expression of genes involved in retinoid metabolism. This study suggests that compared to quiescent cells, activated HSCs are hypermetabolic and have reduced apparent formation of retinoic acid, which may alter downstream retinoic acid signaling.
Collapse
Affiliation(s)
- Lindsay C Czuba
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington (L.C.C., N.I.) and Department of Pharmaceutical Sciences, University of Kentucky, College of Pharmacy, Lexington, Kentucky (L.C.C.)
| | - Nina Isoherranen
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington (L.C.C., N.I.) and Department of Pharmaceutical Sciences, University of Kentucky, College of Pharmacy, Lexington, Kentucky (L.C.C.)
| |
Collapse
|
3
|
Ganguin AA, Skorup I, Streb S, Othman A, Luciani P. Formation and Investigation of Cell-Derived Nanovesicles as Potential Therapeutics against Chronic Liver Disease. Adv Healthc Mater 2023; 12:e2300811. [PMID: 37669775 DOI: 10.1002/adhm.202300811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 08/04/2023] [Indexed: 09/07/2023]
Abstract
A new therapeutic approach using cell-derived nanovesicles (cdNVs) is offered here to overcome the lack of effective treatments for liver fibrosis, a reversible chronic liver disease. To achieve this goal the formation and purification of cdNVs from untreated, quiescent-like, or activated LX-2 cells, an immortalized human hepatic stellate cell (HSC) line with key features of transdifferentiated HSCs are established. Analysis of the genotype and phenotype of naïve and transdifferentiated LX-2 cells activated through transforming growth factor beta 1, following treatment with cdNVs, reveals a concentration-dependent fibrosis regression. The beneficial fibrosis-resolving effects of cdNVs are linked to their biomolecular corona. Liposomes generated using lipids extracted from cdNVs exhibit a reduced antifibrotic response in perpetuated LX-2 cells and show a reduced cellular uptake. However, incubation with soluble factors collected during purification results in a new corona, thereby restoring fibrosis regression activity. Overall, cdNVs display encouraging therapeutic properties, making them a promising candidate for the development of liver fibrosis resolving therapeutics.
Collapse
Affiliation(s)
- Aymar Abel Ganguin
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, 3012, Switzerland
| | - Ivo Skorup
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, 3012, Switzerland
| | - Sebastian Streb
- Functional Genomics Center Zurich (FGCZ), University of Zurich/ETH Zurich, Zurich, 8057, Switzerland
| | - Alaa Othman
- Functional Genomics Center Zurich (FGCZ), University of Zurich/ETH Zurich, Zurich, 8057, Switzerland
| | - Paola Luciani
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, 3012, Switzerland
| |
Collapse
|
4
|
Yi Q, Yang J, Wu Y, Wang Y, Cao Q, Wen W. Immune microenvironment changes of liver cirrhosis: emerging role of mesenchymal stromal cells. Front Immunol 2023; 14:1204524. [PMID: 37539053 PMCID: PMC10395751 DOI: 10.3389/fimmu.2023.1204524] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 06/21/2023] [Indexed: 08/05/2023] Open
Abstract
Cirrhosis is a progressive and diffuse liver disease characterized by liver tissue fibrosis and impaired liver function. This condition is brought about by several factors, including chronic hepatitis, hepatic steatosis, alcohol abuse, and other immunological injuries. The pathogenesis of liver cirrhosis is a complex process that involves the interaction of various immune cells and cytokines, which work together to create the hepatic homeostasis imbalance in the liver. Some studies have indicated that alterations in the immune microenvironment of liver cirrhosis are closely linked to the development and prognosis of the disease. The noteworthy function of mesenchymal stem cells and their paracrine secretion lies in their ability to promote the production of cytokines, which in turn enhance the self-repairing capabilities of tissues. The objective of this review is to provide a summary of the alterations in liver homeostasis and to discuss intercellular communication within the organ. Recent research on MSCs is yielding a blueprint for cell typing and biomarker immunoregulation. Hopefully, as MSCs researches continue to progress, novel therapeutic approaches will emerge to address cirrhosis.
Collapse
Affiliation(s)
- Qiuyun Yi
- National Center for Liver Cancer, Third Affiliated Hospital of Naval Medical University, Shanghai, China
- International Cooperation Laboratory on Signal Transduction, Third Affiliated Hospital of Naval Medical University (Second Military Medical University), Shanghai, China
| | - Jinxian Yang
- National Center for Liver Cancer, Third Affiliated Hospital of Naval Medical University, Shanghai, China
- International Cooperation Laboratory on Signal Transduction, Third Affiliated Hospital of Naval Medical University (Second Military Medical University), Shanghai, China
| | - Ying Wu
- Department of Breast and Thyroid Surgery, Changhai Hospital, Naval Military Medical University, Shanghai, China
| | - Ying Wang
- Department of Laboratory Diagnosis, Third Affiliated Hospital of Naval Medical University (Second Military Medical University), Shanghai, China
| | - Qiqi Cao
- National Center for Liver Cancer, Third Affiliated Hospital of Naval Medical University, Shanghai, China
- International Cooperation Laboratory on Signal Transduction, Third Affiliated Hospital of Naval Medical University (Second Military Medical University), Shanghai, China
| | - Wen Wen
- National Center for Liver Cancer, Third Affiliated Hospital of Naval Medical University, Shanghai, China
- Department of Laboratory Diagnosis, Third Affiliated Hospital of Naval Medical University (Second Military Medical University), Shanghai, China
| |
Collapse
|
5
|
Kim KE, Lee J, Shin HJ, Jeong EA, Jang HM, Ahn YJ, An HS, Lee JY, Shin MC, Kim SK, Yoo WG, Kim WH, Roh GS. Lipocalin-2 activates hepatic stellate cells and promotes nonalcoholic steatohepatitis in high-fat diet-fed Ob/Ob mice. Hepatology 2023; 77:888-901. [PMID: 35560370 PMCID: PMC9936980 DOI: 10.1002/hep.32569] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/19/2022] [Accepted: 05/08/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND AIMS In obesity and type 2 diabetes mellitus, leptin promotes insulin resistance and contributes to the progression of NASH via activation of hepatic stellate cells (HSCs). However, the pathogenic mechanisms that trigger HSC activation in leptin-deficient obesity are still unknown. This study aimed to determine how HSC-targeting lipocalin-2 (LCN2) mediates the transition from simple steatosis to NASH. APPROACH AND RESULTS Male wild-type (WT) and ob/ob mice were fed a high-fat diet (HFD) for 20 weeks to establish an animal model of NASH with fibrosis. Ob/ob mice were subject to caloric restriction or recombinant leptin treatment. Double knockout (DKO) mice lacking both leptin and lcn2 were also fed an HFD for 20 weeks. In addition, HFD-fed ob/ob mice were treated with gadolinium trichloride to deplete Kupffer cells. The LX-2 human HSCs and primary HSCs from ob/ob mice were used to investigate the effects of LCN2 on HSC activation. Serum and hepatic LCN2 expression levels were prominently increased in HFD-fed ob/ob mice compared with normal diet-fed ob/ob mice or HFD-fed WT mice, and these changes were closely linked to liver fibrosis and increased hepatic α-SMA/matrix metalloproteinase 9 (MMP9)/signal transducer and activator of transcription 3 (STAT3) protein levels. HFD-fed DKO mice showed a marked reduction of α-SMA protein compared with HFD-fed ob/ob mice. In particular, the colocalization of LCN2 and α-SMA was increased in HSCs from HFD-fed ob/ob mice. In primary HSCs from ob/ob mice, exogenous LCN2 treatment induced HSC activation and MMP9 secretion. By contrast, LCN2 receptor 24p3R deficiency or a STAT3 inhibitor reduced the activation and migration of primary HSCs. CONCLUSIONS LCN2 acts as a key mediator of HSC activation in leptin-deficient obesity via α-SMA/MMP9/STAT3 signaling, thereby exacerbating NASH.
Collapse
Affiliation(s)
- Kyung Eun Kim
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Jaewoong Lee
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Hyun Joo Shin
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Eun Ae Jeong
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Hye Min Jang
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Yu Jeong Ahn
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Hyeong Seok An
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Jong Youl Lee
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Meong Cheol Shin
- College of Pharmacy , Research Institute of Pharmaceutical Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Soo Kyoung Kim
- Department of Internal Medicine , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Won Gi Yoo
- Department of Parasitology and Tropical Medicine , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| | - Won Ho Kim
- Division of Cardiovascular Diseases , Center for Biomedical Sciences , Korea National Institute of Health , Cheongju , Republic of Korea
| | - Gu Seob Roh
- Department of Anatomy and Convergence Medical Science , College of Medicine , Institute of Health Sciences , Gyeongsang National University , Jinju , Republic of Korea
| |
Collapse
|
6
|
Metabolic Reprogramming of Liver Fibrosis. Cells 2021; 10:cells10123604. [PMID: 34944111 PMCID: PMC8700241 DOI: 10.3390/cells10123604] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 12/12/2022] Open
Abstract
Liver fibrosis is an excessive and imbalanced deposition of fibrous extracellular matrix (ECM) that is associated with the hepatic wound-healing response. It is also the common mechanism that contributes to the impairment of the liver function that is observed in many chronic liver diseases (CLD). Despite the efforts, no effective therapy against fibrosis exists yet. Worryingly, due to the growing obesity pandemic, fibrosis incidence is on the rise. Here, we aim to summarize the main components and mechanisms involved in the progression of liver fibrosis, with special focus on the metabolic regulation of key effectors of fibrogenesis, hepatic stellate cells (HSCs), and their role in the disease progression. Hepatic cells that undergo metabolic reprogramming require a tightly controlled, fine-tuned cellular response, allowing them to meet their energetic demands without affecting cellular integrity. Here, we aim to discuss the role of ribonucleic acid (RNA)-binding proteins (RBPs), whose dynamic nature being context- and stimuli-dependent make them very suitable for the fibrotic situation. Thus, we will not only summarize the up-to-date literature on the metabolic regulation of HSCs in liver fibrosis, but also on the RBP-dependent post-transcriptional regulation of this metabolic switch that results in such important consequences for the progression of fibrosis and CLD.
Collapse
|
7
|
Suzuki M, Wang T, Garretto D, Isasi CR, Cardoso WV, Greally JM, Quadro L. Disproportionate Vitamin A Deficiency in Women of Specific Ethnicities Linked to Differences in Allele Frequencies of Vitamin A-Related Polymorphisms. Nutrients 2021; 13:nu13061743. [PMID: 34063790 PMCID: PMC8223783 DOI: 10.3390/nu13061743] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 11/16/2022] Open
Abstract
Background: While the current national prevalence rate of vitamin A deficiency (VAD) is estimated to be less than 1%, it is suggested that it varies between different ethnic groups and races within the U.S. We assessed the prevalence of VAD in pregnant women of different ethnic groups and tested these prevalence rates for associations with the vitamin A-related single nucleotide polymorphism (SNP) allele frequencies in each ethnic group. Methods: We analyzed two independent datasets of serum retinol levels with self-reported ethnicities and the differences of allele frequencies of the SNPs associated with vitamin A metabolism between groups in publicly available datasets. Results: Non-Hispanic Black and Hispanic pregnant women showed high VAD prevalence in both datasets. Interestingly, the VAD prevalence for Hispanic pregnant women significantly differed between datasets (p = 1.973 × 10−10, 95%CI 0.04–0.22). Alleles known to confer the risk of low serum retinol (rs10882272 C and rs738409 G) showed higher frequencies in the race/ethnicity groups with more VAD. Moreover, minor allele frequencies of a set of 39 previously reported SNPs associated with vitamin A metabolism were significantly different between the populations of different ancestries than those of randomly selected SNPs (p = 0.030). Conclusions: Our analysis confirmed that VAD prevalence varies between different ethnic groups/races and may be causally associated with genetic variants conferring risk for low retinol levels. Assessing genetic variant information prior to performing an effective nutrient supplementation program will help us plan more effective food-based interventions.
Collapse
Affiliation(s)
- Masako Suzuki
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Tao Wang
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Diana Garretto
- Department of Obstetrics and Gynecology and Women's Health, Stony Brook University Medical Center, Stony Brook, NY 11794, USA
| | - Carmen R Isasi
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Wellington V Cardoso
- Columbia Center for Human Development, Department of Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - John M Greally
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Loredana Quadro
- Department of Food Science and Rutgers Center for Lipid Research, and New Jersey Institute for Food, Nutrition, and Health, Rutgers University, New Brunswick, NJ 08901, USA
| |
Collapse
|
8
|
Hepatic Stellate Cell Activation and Inactivation in NASH-Fibrosis-Roles as Putative Treatment Targets? Biomedicines 2021; 9:biomedicines9040365. [PMID: 33807461 PMCID: PMC8066583 DOI: 10.3390/biomedicines9040365] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 03/25/2021] [Accepted: 03/27/2021] [Indexed: 02/07/2023] Open
Abstract
Hepatic fibrosis is the primary predictor of mortality in patients with non-alcoholic steatohepatitis (NASH). In this process, the activated hepatic stellate cells (HSCs) constitute the principal cells responsible for the deposition of a fibrous extracellular matrix, thereby driving the hepatic scarring. HSC activation, migration, and proliferation are controlled by a complex signaling network involving growth factors, lipotoxicity, inflammation, and cellular stress. Conversely, the clearance of activated HSCs is a prerequisite for the resolution of the extracellular fibrosis. Hence, pathways regulating the fate of the HSCs may represent attractive therapeutic targets for the treatment and prevention of NASH-associated hepatic fibrosis. However, the development of anti-fibrotic drugs for NASH patients has not yet resulted in clinically approved therapeutics, underscoring the complex biology and challenges involved when targeting the intricate cellular signaling mechanisms. This narrative review investigated the mechanisms of activation and inactivation of HSCs with a focus on NASH-associated hepatic fibrosis. Presenting an updated overview, this review highlights key cellular pathways with potential value for the development of future treatment modalities.
Collapse
|
9
|
The mechanism and role of intracellular α-ketoglutarate reduction in hepatic stellate cell activation. Biosci Rep 2021; 40:222269. [PMID: 32124915 PMCID: PMC7069903 DOI: 10.1042/bsr20193385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 02/18/2020] [Accepted: 02/26/2020] [Indexed: 12/24/2022] Open
Abstract
Background: The activation of hepatic stellate cells (HSCs) plays a central role in liver fibrosis. α-ketoglutarate is a natural metabolite and previous studies have shown that increase in intracellular α-ketoglutarate can inhibit HSC activation. Aim: The aim of the present study is to determine the changes and role of intracellular α-ketoglutarate in HSC activation and clarify its mechanism of action. Methods: A human HSC cell line (LX-2) and the primary mouse HSC were used in the present study. We detected the changes of intracellular α-ketoglutarate levels and the expression of enzymes involved in the metabolic processes during HSC activation. We used siRNA to determine the role of intracellular α-ketoglutarate in HSC activation and elucidate the mechanism of the metabolic changes. Results: Our results demonstrated that intracellular α-ketoglutarate levels decreased with an HSC cell line and primary mouse HSC activation, as well as the expression of isocitrate dehydrogenase 2 (IDH2), an enzyme that catalyzes the production of α-ketoglutarate. In addition, knockdown of IDH2 efficiently promoted the activation of HSCs, which was able to be reversed by introduction of an α-ketoglutarate analogue. Furthermore, we demonstrated that α-ketoglutarate regulated HSC activation is independent of transforming growth factor-β1 (TGF-β1). Conclusions: Our findings demonstrated that decrease in IDH2 expression limits the production of α-ketoglutarate during HSC activation and in turn promotes the activation of HSCs through a TGF-β1 independent pathway. The present study suggests that IDH2 and α-ketoglutarate may be potential new targets for the prevention and treatment of liver fibrosis.
Collapse
|
10
|
Payen VL, Lavergne A, Alevra Sarika N, Colonval M, Karim L, Deckers M, Najimi M, Coppieters W, Charloteaux B, Sokal EM, El Taghdouini A. Single-cell RNA sequencing of human liver reveals hepatic stellate cell heterogeneity. JHEP Rep 2021; 3:100278. [PMID: 34027339 PMCID: PMC8121977 DOI: 10.1016/j.jhepr.2021.100278] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 02/11/2021] [Accepted: 02/28/2021] [Indexed: 02/07/2023] Open
Abstract
Background & Aims The multiple vital functions of the human liver are performed by highly specialised parenchymal and non-parenchymal cells organised in complex collaborative sinusoidal units. Although crucial for homeostasis, the cellular make-up of the human liver remains to be fully elucidated. Here, single-cell RNA-sequencing was used to unravel the heterogeneity of human liver cells, in particular of hepatocytes (HEPs) and hepatic stellate cells (HSCs). Method The transcriptome of ~25,000 freshly isolated human liver cells was profiled using droplet-based RNA-sequencing. Recently published data sets and RNA in situ hybridisation were integrated to validate and locate newly identified cell populations. Results In total, 22 cell populations were annotated that reflected the heterogeneity of human parenchymal and non-parenchymal liver cells. More than 20,000 HEPs were ordered along the portocentral axis to confirm known, and reveal previously undescribed, zonated liver functions. The existence of 2 subpopulations of human HSCs with unique gene expression signatures and distinct intralobular localisation was revealed (i.e. portal and central vein-concentrated GPC3+ HSCs and perisinusoidally located DBH+ HSCs). In particular, these data suggest that, although both subpopulations collaborate in the production and organisation of extracellular matrix, GPC3+ HSCs specifically express genes involved in the metabolism of glycosaminoglycans, whereas DBH+ HSCs display a gene signature that is reminiscent of antigen-presenting cells. Conclusions This study highlights metabolic zonation as a key determinant of HEP transcriptomic heterogeneity and, for the first time, outlines the existence of heterogeneous HSC subpopulations in the human liver. These findings call for further research on the functional implications of liver cell heterogeneity in health and disease. Lay summary This study resolves the cellular landscape of the human liver in an unbiased manner and at high resolution to provide new insights into human liver cell biology. The results highlight the physiological heterogeneity of human hepatic stellate cells. A cell atlas from the near-native transcriptome of >25,000 human liver cells is presented. Hepatocytes were ordered along the portocentral axis to reveal previously undescribed gene expression patterns and zonated liver functions. Two subpopulations of human hepatic stellate cells (HSCs) are reported, characterised by different spatial distribution in the native tissue. Characteristic gene signatures of HSC subpopulations are suggestive of far-reaching functional differences.
Collapse
Key Words
- BSA, bovine serum albumin
- CC, cholangiocyte
- CV, central vein
- DEG, differentially expressed gene
- EC, endothelial cell
- ECM, extracellular matrix
- Extracellular matrix
- FFPE, formaldehyde-fixed paraffin embedded
- GAG, glycosaminoglycan
- GEO, Gene Expression Omnibus
- GO, gene ontology
- HEP, hepatocyte
- HLA, human leukocyte antigen
- HRP, horseradish peroxidase
- HSC, hepatic stellate cell
- Hepatocyte
- ISH, in situ hybridisation
- KLR, killer lectin-like receptor
- LP, lymphoid cell
- Liver cell atlas
- MP, macrophage
- MZ, midzonal
- PC, pericentral
- PP, periportal
- PV, portal vein
- TBS, Tris buffered saline
- TSA, tyramide signal amplification
- UMAP, uniform manifold approximation and projection
- UMI, unique molecular identifier
- VIM, vimentin
- Zonation
- scRNA-seq, single-cell RNA-sequencing
Collapse
Affiliation(s)
- Valéry L. Payen
- Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Brussels, Belgium
- Laboratory of Advanced Drug Delivery and Biomaterials (ADDB), LDRI Institute, Université catholique de Louvain, Brussels, Belgium
| | - Arnaud Lavergne
- Genomics Platform, GIGA Institute, Université de Liège, Liège, Belgium
| | - Niki Alevra Sarika
- Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Brussels, Belgium
- Laboratory of Advanced Drug Delivery and Biomaterials (ADDB), LDRI Institute, Université catholique de Louvain, Brussels, Belgium
| | - Megan Colonval
- Genomics Platform, GIGA Institute, Université de Liège, Liège, Belgium
| | - Latifa Karim
- Genomics Platform, GIGA Institute, Université de Liège, Liège, Belgium
| | - Manon Deckers
- Genomics Platform, GIGA Institute, Université de Liège, Liège, Belgium
| | - Mustapha Najimi
- Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Brussels, Belgium
| | - Wouter Coppieters
- Genomics Platform, GIGA Institute, Université de Liège, Liège, Belgium
| | | | - Etienne M. Sokal
- Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Brussels, Belgium
- Corresponding authors. Address: Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Avenue Mounier 52 Box B1.52.03, 1200 Brussels, Belgium.
| | - Adil El Taghdouini
- Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Brussels, Belgium
- Corresponding authors. Address: Laboratory of Pediatric Hepatology and Cell Therapy (PEDI), IREC Institute, Université catholique de Louvain, Avenue Mounier 52 Box B1.52.03, 1200 Brussels, Belgium.
| |
Collapse
|
11
|
Abstract
Hepatic stellate cells (HSCs) are resident non-parenchymal liver pericytes whose plasticity enables them to regulate a remarkable range of physiologic and pathologic responses. To support their functions in health and disease, HSCs engage pathways regulating carbohydrate, mitochondrial, lipid, and retinoid homeostasis. In chronic liver injury, HSCs drive hepatic fibrosis and are implicated in inflammation and cancer. To do so, the cells activate, or transdifferentiate, from a quiescent state into proliferative, motile myofibroblasts that secrete extracellular matrix, which demands rapid adaptation to meet a heightened energy need. Adaptations include reprogramming of central carbon metabolism, enhanced mitochondrial number and activity, endoplasmic reticulum stress, and liberation of free fatty acids through autophagy-dependent hydrolysis of retinyl esters that are stored in cytoplasmic droplets. As an archetype for pericytes in other tissues, recognition of the HSC's metabolic drivers and vulnerabilities offer the potential to target these pathways therapeutically to enhance parenchymal growth and modulate repair.
Collapse
Affiliation(s)
- Parth Trivedi
- Division of Liver Diseases, The Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Shuang Wang
- Division of Liver Diseases, The Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Scott L Friedman
- Division of Liver Diseases, The Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| |
Collapse
|
12
|
Li B, Liu J, Xin X, Zhang L, Zhou J, Xia C, Zhu W, Yu H. MiR-34c promotes hepatic stellate cell activation and Liver Fibrogenesis by suppressing ACSL1 expression. Int J Med Sci 2021; 18:615-625. [PMID: 33437196 PMCID: PMC7797556 DOI: 10.7150/ijms.51589] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/02/2020] [Indexed: 12/19/2022] Open
Abstract
Normally, there are multiple microRNAs involved in the pathogenesis of liver fibrosis. In our work, we aimed at identifying the role of miR-34c in the hepatic stellate cell (HSC) activation and liver fibrosis and its potential mechanism. Our results have shown that during natural activation of HSC, the level of miR-34c was increased significantly whereas acyl-CoA synthetase long-chain family member-1(ACSL1), which is a key enzyme can affect fatty acid(FA) synthesis, was decreased. A double fluorescence reporter assay further confirmed that ACSL1 is a direct target gene of miR-34c. Moreover, the inhibition of miR-34C can attenuate the synthesis of collagen in HSC-T6. In our rescue assay, ACSL1 expression was 1.49-fold higher compared to normal control cells which were transfected with the miR-34c inhibitor in a stable low expression ACSL1 cell line. While at the same time, α-SMA and Col1α expression decreased by 18.22% and 2.58%, respectively. Moreover, we performed an in vivo model using dimethylnitrosamine (DMN) in conjunction with the miR-34c agomir, combined with the treatment of DMN and the miR-34c agomir can increase liver fibrosis. Meanwhile, the degree of hepatic fibrosis was increased and lipid droplets reduced dramatically in rats and HSC-T6 cell treated with miR-34c mimics alone compared to untreated groups. Our results indicate that miR-34c plays an essential role in liver fibrosis by targeting ACSL1 closely associated with lipid droplets, and it might be used as a potential therapeutic target.
Collapse
Affiliation(s)
- Binbin Li
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| | - Jiaxuan Liu
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| | - Xuan Xin
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
- Department of Pathology, No. 960 Hospital of People' Liberation Army, Jinan 250031, China
| | - Lifen Zhang
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| | - Jiaming Zhou
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
- Department of Pathological Anatomy, Nantong University, Nantong 226001, China
| | - Chunyan Xia
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| | - Weijian Zhu
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| | - Hongyu Yu
- Department of Pathology, Changzheng Hospital, Navy Medical University (Second Military Medical University), Shanghai 200003, China
| |
Collapse
|
13
|
Playing Jekyll and Hyde-The Dual Role of Lipids in Fatty Liver Disease. Cells 2020; 9:cells9102244. [PMID: 33036257 PMCID: PMC7601321 DOI: 10.3390/cells9102244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/27/2020] [Accepted: 10/01/2020] [Indexed: 12/12/2022] Open
Abstract
Lipids play Jekyll and Hyde in the liver. On the one hand, the lipid-laden status of hepatic stellate cells is a hallmark of healthy liver. On the other hand, the opposite is true for lipid-laden hepatocytes—they obstruct liver function. Neglected lipid accumulation in hepatocytes can progress into hepatic fibrosis, a condition induced by the activation of stellate cells. In their resting state, these cells store substantial quantities of fat-soluble vitamin A (retinyl esters) in large lipid droplets. During activation, these lipid organelles are gradually degraded. Hence, treatment of fatty liver disease is treading a tightrope—unsophisticated targeting of hepatic lipid accumulation might trigger problematic side effects on stellate cells. Therefore, it is of great importance to gain more insight into the highly dynamic lipid metabolism of hepatocytes and stellate cells in both quiescent and activated states. In this review, part of the special issue entitled “Cellular and Molecular Mechanisms underlying the Pathogenesis of Hepatic Fibrosis 2020”, we discuss current and highly versatile aspects of neutral lipid metabolism in the pathogenesis of non-alcoholic fatty liver disease (NAFLD).
Collapse
|
14
|
Wagner C, Hois V, Pajed L, Pusch LM, Wolinski H, Trauner M, Zimmermann R, Taschler U, Lass A. Lysosomal acid lipase is the major acid retinyl ester hydrolase in cultured human hepatic stellate cells but not essential for retinyl ester degradation. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158730. [PMID: 32361002 PMCID: PMC7279957 DOI: 10.1016/j.bbalip.2020.158730] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 04/22/2020] [Accepted: 04/25/2020] [Indexed: 02/07/2023]
Abstract
Vitamin A is stored as retinyl esters (REs) in lipid droplets of hepatic stellate cells (HSCs). To date, two different pathways are known to facilitate the breakdown of REs: (i) Hydrolysis of REs by neutral lipases, and (ii) whole lipid droplet degradation in autolysosomes by acid hydrolysis. In this study, we evaluated the contribution of neutral and acid RE hydrolases to the breakdown of REs in human HSCs. (R)-Bromoenol lactone (R-BEL), inhibitor of adipose triglyceride lipase (ATGL) and patatin-like phospholipase domain-containing 3 (PNPLA3), the hormone-sensitive lipase (HSL) inhibitor 76-0079, as well as the serine-hydrolase inhibitor Orlistat reduced neutral RE hydrolase activity of LX-2 cell-lysates between 20 and 50%. Interestingly, in pulse-chase experiments, R-BEL, 76-0079, as well as Orlistat exerted little to no effect on cellular RE breakdown of LX-2 cells as well as primary human HSCs. In contrast, Lalistat2, a specific lysosomal acid lipase (LAL) inhibitor, virtually blunted acid in vitro RE hydrolase activity of LX-2 cells. Accordingly, HSCs isolated from LAL-deficient mice showed RE accumulation and were virtually devoid of acidic RE hydrolase activity. In pulse-chase experiments however, LAL-deficient HSCs, similar to LX-2 cells and primary human HSCs, were not defective in degrading REs. In summary, results demonstrate that ATGL, PNPLA3, and HSL contribute to neutral RE hydrolysis of human HSCs. LAL is the major acid RE hydrolase in HSCs. Yet, LAL is not limiting for RE degradation under serum-starvation. Together, results suggest that RE breakdown of HSCs is facilitated by (a) so far unknown, non-Orlistat inhibitable RE-hydrolase(s).
Collapse
Affiliation(s)
- Carina Wagner
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Victoria Hois
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Laura Pajed
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Lisa-Maria Pusch
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Heimo Wolinski
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria
| | - Michael Trauner
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Ulrike Taschler
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria.
| | - Achim Lass
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Heinrichstraße 31/II, A-8010 Graz, Austria; BioTechMed-Graz, Graz, Austria.
| |
Collapse
|
15
|
Lee H, Kim J, Choi Y, Cho DW. Application of Gelatin Bioinks and Cell-Printing Technology to Enhance Cell Delivery Capability for 3D Liver Fibrosis-on-a-Chip Development. ACS Biomater Sci Eng 2020; 6:2469-2477. [DOI: 10.1021/acsbiomaterials.9b01735] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hyungseok Lee
- Department of Mechanical and Biomedical Engineering, Kangwon National University (KNU), 1 Gangwondaehak-gil, Seoksa-dong, Chuncheon-si, Gangwon-do, 24341, South Korea
| | - Jongmin Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Hyogok-dong, Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, South Korea
| | - Yeongjin Choi
- Materials Processing Innovation Research Division, Department of Advanced Biomaterials Research, Korea Institute of Materials Science (KIMS), 797 Changwon-daero, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51508, South Korea
| | - Dong-Woo Cho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Hyogok-dong, Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, South Korea
| |
Collapse
|
16
|
Khomich O, Ivanov AV, Bartosch B. Metabolic Hallmarks of Hepatic Stellate Cells in Liver Fibrosis. Cells 2019; 9:E24. [PMID: 31861818 PMCID: PMC7016711 DOI: 10.3390/cells9010024] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 12/09/2019] [Accepted: 12/18/2019] [Indexed: 12/17/2022] Open
Abstract
Liver fibrosis is a regenerative process that occurs after injury. It is characterized by the deposition of connective tissue by specialized fibroblasts and concomitant proliferative responses. Chronic damage that stimulates fibrogenic processes in the long-term may result in the deposition of excess matrix tissue and impairment of liver functions. End-stage fibrosis is referred to as cirrhosis and predisposes strongly to the loss of liver functions (decompensation) and hepatocellular carcinoma. Liver fibrosis is a pathology common to a number of different chronic liver diseases, including alcoholic liver disease, non-alcoholic fatty liver disease, and viral hepatitis. The predominant cell type responsible for fibrogenesis is hepatic stellate cells (HSCs). In response to inflammatory stimuli or hepatocyte death, HSCs undergo trans-differentiation to myofibroblast-like cells. Recent evidence shows that metabolic alterations in HSCs are important for the trans-differentiation process and thus offer new possibilities for therapeutic interventions. The aim of this review is to summarize current knowledge of the metabolic changes that occur during HSC activation with a particular focus on the retinol and lipid metabolism, the central carbon metabolism, and associated redox or stress-related signaling pathways.
Collapse
Affiliation(s)
- Olga Khomich
- INSERM, U1052, Cancer Research Center of Lyon (CRCL), Université de Lyon (UCBL1), CNRS UMR_5286, Centre Léon Bérard, CEDEX 03, 69424 Lyon, France;
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Alexander V. Ivanov
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Birke Bartosch
- INSERM, U1052, Cancer Research Center of Lyon (CRCL), Université de Lyon (UCBL1), CNRS UMR_5286, Centre Léon Bérard, CEDEX 03, 69424 Lyon, France;
| |
Collapse
|
17
|
Synergy of Phospholipid-Drug Formulations Significantly Deactivates Profibrogenic Human Hepatic Stellate Cells. Pharmaceutics 2019; 11:pharmaceutics11120676. [PMID: 31842373 PMCID: PMC6969915 DOI: 10.3390/pharmaceutics11120676] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 12/06/2019] [Accepted: 12/09/2019] [Indexed: 02/06/2023] Open
Abstract
The pivotal role of hepatic stellate cells (HSCs) in orchestrating the bidirectional process of progression and regression of liver fibrosis makes them an ideal target for exploring new antifibrotic therapies. Essential phospholipids (EPLs), with their polyenylphosphatidylcholine (PPC) fraction, either alone or combined with other hepatoprotective substances such as silymarin, are recommended in hepatic impairment, but a scientific rationale for their use is still lacking. Herein, we compared the ability of EPLs to restore quiescent-like features in HSCs with that of dilinoleoylphosphatidylcholine (DLPC), PPC fraction’s main component. Specifically, we screened at the cellular level the antifibrotic effects of PPC formulations in the presence and absence of silymarin, by using LX-2 cells (pro-fibrogenic HSCs) and by assessing the main biochemical hallmarks of the activated and deactivated states of this cell line. We also proved the formulations’ direct effect on the motional order of cell membranes of adherent cells. LX-2 cells, examined for lipid droplets as a quiescence marker, showed that PPCs led to a more prominent deactivation than DLPC. This result was confirmed by a reduction of collagen and α-SMA expression, and by a profound alteration in the cell membrane fluidity. PPC–silymarin formulations deactivated HSCs with a significant synergistic effect. The remarkable bioactivity of PPCs in deactivating fibrogenic HSCs paves the way for the rational design of new therapeutics aimed at managing hepatic fibrosis.
Collapse
|
18
|
Okeigwe I, Bulun S, Liu S, Rademaker AW, Coon JS, Kujawa S, Robins J, Yin P. PLIN2 Functions As a Novel Link Between Progesterone Signaling and Metabolism in Uterine Leiomyoma Cells. J Clin Endocrinol Metab 2019; 104:6256-6264. [PMID: 31504629 PMCID: PMC6823729 DOI: 10.1210/jc.2019-00762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/16/2019] [Indexed: 11/19/2022]
Abstract
CONTEXT Uterine leiomyoma (fibroids) are the most common tumors in women. Recently, perilipin-2 (PLIN2) was identified as a critical target gene of the progesterone receptor; however, its function in the pathogenesis of fibroids is unknown. OBJECTIVE To determine the function of PLIN2 in leiomyoma cells. DESIGN Tissue and primary cells from leiomyoma and myometrium were analyzed. PLIN2 function in leiomyoma was assessed using small interfering RNA. RNA-sequencing was performed to identify genome-wide effects of PLIN2 depletion. Metabolic activity was measured using the Seahorse XF96 analyzer. Real-time quantitative PCR and immunoblotting were also performed. SETTING Laboratory. PATIENTS OR OTHER PARTICIPANTS Forty-one premenopausal women undergoing surgery for fibroids. MAIN OUTCOME MEASURES Gene expression, oxygen consumption rate (OCR), extracellular acidification rate (ECAR), and cell proliferation. RESULTS PLIN2 gene expression was 2.4-fold lower in leiomyoma compared with adjacent myometrium, suggesting a link between PLIN2 deficiency and fibroids. A total of 3877 genes were differentially expressed after PLIN2 knockdown. Gene ontology analysis identified metabolism as the second-highest biological process affected by PLIN2 depletion. OCR (mitochondrial respiration) and ECAR (glycolysis) were significantly upregulated after PLIN2 knockdown; PLIN2-depleted cells had a greater basal metabolic activity and higher metabolic stress response. Cell proliferation was also significantly increased after PLIN2 knockdown. CONCLUSIONS PLIN2 depletion increases mitochondrial respiration and glycolysis, suggesting that PLIN2 is a critical regulator of metabolic function in leiomyoma cells. PLIN2 deficiency also reprograms leiomyoma cells to a proproliferative phenotype. These findings introduce metabolomics as an area to explore to better understand leiomyoma tumorigenesis.
Collapse
Affiliation(s)
- Ijeoma Okeigwe
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Serdar Bulun
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Shimeng Liu
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Alfred W Rademaker
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - John S Coon
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Stacy Kujawa
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Jared Robins
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Ping Yin
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
- Correspondence and Reprint Requests: Ping Yin, MD, PhD, Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, 303 East Superior Street, Suite 4-121, Chicago, Illinois 60611. E-mail:
| |
Collapse
|
19
|
Wu Y, Li Z, Xiu AY, Meng DX, Wang SN, Zhang CQ. Carvedilol attenuates carbon tetrachloride-induced liver fibrosis and hepatic sinusoidal capillarization in mice. DRUG DESIGN DEVELOPMENT AND THERAPY 2019; 13:2667-2676. [PMID: 31534314 PMCID: PMC6681906 DOI: 10.2147/dddt.s210797] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/30/2019] [Indexed: 12/24/2022]
Abstract
Aim To investigate the effect of carvedilol on liver fibrosis and hepatic sinusoidal capillarization in mice with carbon tetrachloride (CCl4)-induced fibrosis. Methods A liver fibrosis mouse model was induced by intraperitoneal CCl4 injection for 8 weeks. The mice were divided into five experimental groups: the normal group, the oil group, the CCl4 group, the CCl4+carvedilol (5 mg/kg/d) group, and the CCl4+carvedilol (10 mg/kg/d) group. The extent of liver fibrosis was evaluated by histopathological staining, and the changes in fenestrations of hepatic sinus endothelial cells were observed by scanning electron microscope (SEM). The expression of α-smooth muscle actin (α-SMA) and vascular endothelial markers was detected by immunohistochemistry and Western blot assays. The effect of carvedilol on cell apoptosis was studied via Terminal deoxynucleotidyl Transferase Mediated dUTP Nick End Labeling (TUNEL) assay, and the serum levels of matrix metalloproteinase-8 (MMP-8), vascular endothelial growth factor (VEGF), and angiopoietin-2 were detected through a Luminex assay. Results Liver fibrosis in CCl4-treated mice was attenuated by reduced accumulation of collagen and the reaction of inflammation with carvedilol treatment. Carvedilol reduced the activation of hepatic stellate cells (HSCs) and increased the number of apoptotic cells. The expression of α-SMA, CD31, CD34 and VWF (von Willebrand factor) was significantly decreased after carvedilol treatment. In addition, the number of fenestrae in the hepatic sinusoid showed notable differences between the groups, and the serum levels of MMP-8, VEGF and angiopoietin-2 were increased in the mice with liver fibrosis and reduced by carvedilol treatment. Conclusion The study demonstrated that carvedilol could prevent further development of liver fibrosis and hepatic sinusoidal capillarization in mice with CCl4-induced fibrosis.
Collapse
Affiliation(s)
- Ying Wu
- Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| | - Zhen Li
- Department of Health Digestion, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| | - Ai-Yuan Xiu
- Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| | - Dong-Xiao Meng
- Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| | - Si-Ning Wang
- Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| | - Chun-Qing Zhang
- Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong Province, People's Republic of China
| |
Collapse
|
20
|
Bi Y, Liu X, Si C, Hong Y, Lu Y, Gao P, Yang Y, Zhang X, Wang Y, Xiong H, Duan Z, Chen Y, Hong F. Transplanted adult human hepatic stem/progenitor cells prevent histogenesis of advanced hepatic fibrosis in mice induced by carbon tetrachloride. Am J Transl Res 2019; 11:2350-2358. [PMID: 31105841 PMCID: PMC6511762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/24/2019] [Indexed: 06/09/2023]
Abstract
Transplantation of adult human hepatic stem/progenitor cells (hHSPCs) has been considered as an alternative therapy, replacing donor liver transplantation to treat liver cirrhosis. This study assessed the antifibrotic effects of hHSPCs in mice with fibrosis induced by carbon tetrachloride (CCl4) and examined the actions of hHSPCs on the fibrogenic activity of human hepatic stellate cells (HSCs) in a coculture system. Isolated hHSPCs expressed stem/progenitor cell phenotypic markers. Mice were given CCl4 (twice weekly for 7 weeks) and hHSPC transplantation weekly. CCl4 induced advanced fibrosis (bridging fibrosis and cirrhosis) in mice, which was prevented by hHSPC transplantation. The liver of hHSPC-transplanted mice showed only occasional short septa and focal parenchymal fibrosis, and a 50% reduction in hepatic collagen, assessed by Sirius red stain histomorphometry. Moreover, the proteins for α-smooth muscle actin (α-SMA) and collagen I were decreased. While α-SMA, collagen α1(I), and tissue inhibitor of metalloproproteinase-1 mRNAs were decreased, matrix metalloproteinase (MMP)-1 mRNA was increased, consistent with decreased fibrogenesis. MMP-2 and transforming growth factor-β were not affected. Alanine aminotransferase and aspartate aminotransferase were lower, suggesting improvement of liver function/damage. In coculture, hHSPCs elicited changes of α-SMA and fibrogenic molecules in HSCs similar to those observed in vivo, providing evidence for a functional link between hHSPCs and HSCs. A decreased HSC proliferation was noted. Thus, transplantation of hHSPCs prevents histogenesis of advanced liver fibrosis caused by CCl4. hHSPCs mediate downregulation of HSC activation coincident with modulation of fibrogenic molecule expression, leading to suppression of fibrogenesis both in vivo and in vitro.
Collapse
Affiliation(s)
- Yanzhen Bi
- Difficult and Complicated Liver Diseases and Artificial Liver Center, Beijing Youan Hospital, Capital Medical UniversityBeijing 100069, China
- Beijing Municipal Key Laboratory of Liver Failure and Artificial Liver Treatment ResearchBeijing 100069, China
| | - Xiyu Liu
- The Thoracic Surgery Department, Affiliated Hospital of Guilin Medical UniversityGuilin 541001, China
| | - Chuanping Si
- Institute of Liver Diseases, Affiliated Hospital of Jining Medical UniversityJining 272000, China
| | - Ye Hong
- University of TurkuTurku 20014, Finland
| | - Yongke Lu
- Department of Health Sciences, College of Public Health, East Tennessee State UniversityJohnson 37614, TN, USA
| | - Pengfei Gao
- College of Pharmacy, Dali UniversityDali 671000, China
| | - Yonghong Yang
- Institute of Liver Diseases, Affiliated Hospital of Jining Medical UniversityJining 272000, China
| | - Xiaobei Zhang
- Institute of Liver Diseases, Affiliated Hospital of Jining Medical UniversityJining 272000, China
| | - Yibo Wang
- Institute of Liver Diseases, Affiliated Hospital of Jining Medical UniversityJining 272000, China
| | - Huabao Xiong
- Department of Medicine, Precision Immunology Institute, Icahn School of Medicine at Mount SinaiNew York, NY 10029, USA
| | - Zhongping Duan
- Difficult and Complicated Liver Diseases and Artificial Liver Center, Beijing Youan Hospital, Capital Medical UniversityBeijing 100069, China
- Beijing Municipal Key Laboratory of Liver Failure and Artificial Liver Treatment ResearchBeijing 100069, China
| | - Yu Chen
- Difficult and Complicated Liver Diseases and Artificial Liver Center, Beijing Youan Hospital, Capital Medical UniversityBeijing 100069, China
- Beijing Municipal Key Laboratory of Liver Failure and Artificial Liver Treatment ResearchBeijing 100069, China
| | - Feng Hong
- Institute of Liver Diseases, Affiliated Hospital of Jining Medical UniversityJining 272000, China
| |
Collapse
|
21
|
Verma A, Bennett J, Örme AM, Polycarpou E, Rooney B. Cocaine addicted to cytoskeletal change and a fibrosis high. Cytoskeleton (Hoboken) 2019; 76:177-185. [PMID: 30623590 DOI: 10.1002/cm.21510] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 12/05/2018] [Accepted: 12/18/2018] [Indexed: 12/17/2022]
Abstract
Cocaine is one of the most widely abused illicit drugs due to its euphoric and addictive properties. Cocaine-mediated cognitive impairments are the result of dynamic cytoskeletal rearrangements involved in mediating structural and behavioural plasticity. Cytoskeletal changes initiated following cocaine abuse are regulated by the Rho family of GTPases with significant downstream activity in key actin binding proteins. Moreover, signalling via the endoplasmic reticulum chaperone protein, sigma-1 receptor has highlighted the possibility of cocaine regulated pathology in other organ systems. However, the question of whether upstream stimulation of such a high affinity binding receptor is directly involved in cocaine-mediated cytoskeletal changes at present remains unknown. In this review, we describe the functional role of key cytoskeletal regulators in response to cocaine-induced signalling cues. In addition, we ascertain the extent of whether global cytoskeletal modulators involved in cocaine-induced neurological stimulation can be used as a platform for future studies into elucidating its fibrotic potential within the hepatic microenvironment. A focus on aspects still poorly understood relating to the nonneuronal pathological impact of cocaine is discussed in the sphere of hepatic dysregulation. Lastly, we suggest that cocaine may mediate its pathological capacity via the sigma1 receptor in regulating hepatoxicity, hepatic stellate cells activity, cytoskeletal dynamics, and the transcriptional regulation of key hepato-fibrogenic modulators.
Collapse
Affiliation(s)
- Avnish Verma
- Kingston University, Department of Applied and Human Sciences, School of Life Sciences, Pharmacy and Chemistry, Surrey, United Kingdom
| | - Jason Bennett
- Centre for Cell Signalling and Inflammation, Department of Medicine, Imperial College London, London, United Kingdom
| | - Ayşe Merve Örme
- Kingston University, Department of Applied and Human Sciences, School of Life Sciences, Pharmacy and Chemistry, Surrey, United Kingdom
| | - Elena Polycarpou
- Kingston University, Department of Applied and Human Sciences, School of Life Sciences, Pharmacy and Chemistry, Surrey, United Kingdom
| | - Brian Rooney
- Kingston University, Department of Applied and Human Sciences, School of Life Sciences, Pharmacy and Chemistry, Surrey, United Kingdom
| |
Collapse
|
22
|
Jophlin LL, Koutalos Y, Chen C, Shah V, Rockey DC. Hepatic stellate cells retain retinoid-laden lipid droplets after cellular transdifferentiation into activated myofibroblasts. Am J Physiol Gastrointest Liver Physiol 2018; 315:G713-G721. [PMID: 30024770 PMCID: PMC6293250 DOI: 10.1152/ajpgi.00251.2017] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Loss of retinyl ester (RE)-rich lipid droplets (LDs) from hepatic stellate cells (HSCs) is cited as a key event in their cellular transdifferentiation to activated, pro-fibrotic myofibroblasts; however, it remains unclear if changes in LD morphology or RE content are causal for transdifferentiation. To better understand LD dynamics in vitro within a common model of HSC activation, we used novel approaches preserving LD morphology and allowing for quantitation of RE. The size and quantity of LDs within in vitro and in vivo bile duct ligation (BDL)-activated HSCs were quantitated using adipocyte differentiation-related protein (ADRP) labeling and oil red o (ORO) staining (gold standard), and RE content was determined using fluorescence microscopy. We found during HSC activation in vitro that LD number differed significantly when measured by ADRP and ORO, respectively ( day 1: 56 vs. 5, P = 0.03; day 4: 101 vs. 39, P = 0.03; day 14: 241 vs. 12, P = 0.02). Ex vivo HSCs activated in vivo contained the same number of LDs as day 4 in vitro activated HSCs (118 vs. 101, P = 0.54). Decline in LD RE occurred beyond day 4 in vitro and day 1 ex vivo , after HSC transdifferentiation was underway. Lastly, in situ HSCs examined using electron microscopy show LDs tend to be smaller but are ultimately retained in BDL injured livers. Therefore, we conclude that during HSC transdifferentiation, LDs are not lost but are retained, decreasing in size. Additionally, RE content declines after transdifferentiation is underway. These data suggest that these LD changes are not causal for HSC transdifferentiation. NEW & NOTEWORTHY Loss of retinoid-laden lipid droplets from hepatic stellate cells has long been held as a hallmark of their transdifferentiation into activated myofibroblasts, the dominant cells that drive hepatic fibrosis. This study demonstrates that stellate cells activated in culture and after liver injury in vivo retain their lipid droplets and that these droplets become smaller and more numerous, with decreases in droplet retinoid concentration occurring only after cellular transdifferentiation is underway.
Collapse
Affiliation(s)
- Loretta L. Jophlin
- 1Department of Medicine, Medical University of South Carolina, Charleston, South Carolina,3Department of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
| | - Yiannis Koutalos
- 2Department of Ophthalmology, Medical University of South Carolina, Charleston, South Carolina
| | - Chunhe Chen
- 2Department of Ophthalmology, Medical University of South Carolina, Charleston, South Carolina
| | - Vijay Shah
- 3Department of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
| | - Don C. Rockey
- 1Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| |
Collapse
|
23
|
Dwivedi DK, Jena GB. Glibenclamide protects against thioacetamide-induced hepatic damage in Wistar rat: investigation on NLRP3, MMP-2, and stellate cell activation. Naunyn Schmiedebergs Arch Pharmacol 2018; 391:1257-1274. [PMID: 30066023 DOI: 10.1007/s00210-018-1540-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 07/13/2018] [Indexed: 02/07/2023]
Abstract
Glibenclamide (GLB), most widely used in the treatment of type II diabetes mellitus, inhibits K+ATP channel in pancreatic-β cells and releases insulin, while thioacetamide (TAA) is a well-known hepatotoxicant and most recommended for the induction of acute and chronic liver disease. The purpose of this study was to evaluate the hepatoprotective potential of GLB against TAA-induced hepatic damage in Wistar rats. TAA (200 mg/kg, ip, twice weekly) and GLB (1.25, 2.5, and 5 mg/kg/day, po) were administered for 6 consecutive weeks. Different biochemical, DNA damage, histopathological, TEM, immunohistochemical, and western blotting parameters were evaluated. GLB treatment has no effects on the TAA-induced significant decrease in body and liver weights. TAA treatment significantly increased liver index and treatment with GLB has no effect the same. TAA treatment altered the liver morphology, whereas treatment with GLB normalized the alteration in morphology. Further, significant increase in oxidative stress, apoptosis, and DNA damage was found in TAA-treated animals and GLB treatment significantly reduced these effects. TAA-induced plasma transaminases and serum ALP levels were significantly restored by GLB. Furthermore, histopathological findings showed the presence of lymphocyte infiltration, collagen deposition, bridging fibrosis, degeneration of portal triad, and necrosis in TAA-treated animals and GLB intervention significantly reduced the same. TEM images revealed that GLB significantly normalized the hepatic stellate cell morphology as well as restored the number of lipid droplets. GLB treatment significantly downregulated the expressions of TGF-β1, α-SMA, NLRP3, ASC, caspase-1, and IL-1β, and upregulated MMP-2 and catalase against TAA-induced liver damage. The outcomes of the present study confirmed that GLB ameliorated the liver damage induced by TAA.
Collapse
Affiliation(s)
- Durgesh Kumar Dwivedi
- Facility for Risk Assessment and Intervention Studies, Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Sector-67, S.A.S., Nagar, Punjab, 160062, India
| | - G B Jena
- Facility for Risk Assessment and Intervention Studies, Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, Sector-67, S.A.S., Nagar, Punjab, 160062, India.
| |
Collapse
|
24
|
Hong Y, Li S, Wang J, Li Y. In vitro inhibition of hepatic stellate cell activation by the autophagy-related lipid droplet protein ATG2A. Sci Rep 2018; 8:9232. [PMID: 29915313 PMCID: PMC6006255 DOI: 10.1038/s41598-018-27686-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 05/18/2018] [Indexed: 02/07/2023] Open
Abstract
Clinical studies have found that moderate intake of retinol or oleic acid can enlarge the lipid droplets of hepatic stellate cells and suppress their activation. However, the link between lipid droplets and cell activation is unknown. This study compared the dynamics of lipid droplet-associated protein expression between activated and reverted stellate cells. Reversion of the activated human stellate cell line LX-2 and inhibition of primary mouse stellate cell activation were induced by retinol or oleic acid, which resulted in larger lipid droplets and the downregulation of cell activation markers. Quantitative proteomics and immunoblotting were performed to compare lipid-droplet protein profiles between activated and reverted LX-2 cells. Compared to expression in activated cells, 50 lipid-droplet proteins were upregulated, whereas 28 were downregulated upon reversion. ATG2A was significantly enriched in lipid droplets of retinol/oleic acid-treated LX-2 cells and quiescent primary stellate cells. Reduced expression of α-SMA, increased expression of perilipin-3, enlarged lipid droplets, and suppression of autophagic flux were observed in ATG2A-deficient LX2 cells. Lipid-droplet protein profile changes during the reversion of activated stellate cells might provide new insights into the molecular mechanisms linking lipid droplets to liver fibrosis. ATG2A could represent a potential new drug target for hepatic fibrosis.
Collapse
Affiliation(s)
- Yun Hong
- First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China. .,Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
| | - Sirui Li
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jifeng Wang
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Youming Li
- First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.
| |
Collapse
|
25
|
de Oliveira da Silva B, Alberici LC, Ramos LF, Silva CM, da Silveira MB, Dechant CRP, Friedman SL, Sakane KK, Gonçalves LR, Moraes KCM. Altered global microRNA expression in hepatic stellate cells LX-2 by angiotensin-(1-7) and miRNA-1914-5p identification as regulator of pro-fibrogenic elements and lipid metabolism. Int J Biochem Cell Biol 2018. [PMID: 29524604 DOI: 10.1016/j.biocel.2018.02.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The development of new therapeutic strategies to control or reverse hepatic fibrosis requires thorough knowledge about its molecular and cellular basis. It is known that the heptapeptide angiotensin-(1-7) [ang-(1-7)] can reduce hepatic fibrosis and steatosis in vivo; therefore, it is important to uncover the mechanisms regulating its activity and cellular model of investigation. Ang-(1-7) is a peptide of the renin-angiotensin system (RAS), and here we investigated its modulatory effect on the expression pattern of microRNAs (miRNAs) in hepatic stellate cells (HSCs) LX-2, which transdifferentiate into fibrogenic and proliferative cells. We compared the miRNA profiles between quiesced, activated and ang-(1-7)-treated activated HSCs to identify miRNAs that may regulate their transdifferentiation. Thirteen miRNAs were pointed, and cellular and molecular analyses identified miRNA-1914-5p as a molecule that contributes to the effects of ang-(1-7) on lipid metabolism and on the pro-fibrotic environment control. In our cellular model, we also analyzed the regulators of fatty acid metabolism. Specifically, miRNA-1914-5p regulates the expression of malonyl-CoA decarboxylase (MLYCD) and phosphatidic acid phosphohydrolase (PAP or Lipin-1). Additionally, Lipin-1 was closely correlated with mRNA expression of peroxisome proliferator-activated receptors (PPAR)-α and -γ, which also contribute to lipid homeostasis and to the reduction of TGF-β1 expression. These findings provide a novel link between RAS and lipid metabolism in controlling HSCs activation.
Collapse
Affiliation(s)
- Brenda de Oliveira da Silva
- Núcleo de Pesquisa em Biologia, Universidade Federal de Ouro Preto, UFOP, Ouro Preto, MG, Brazil; Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil
| | - Luciane Carla Alberici
- Department of Physics and Chemistry, Faculty of Pharmaceutical Sciences of Ribeirão Preto, Universidade de São Paulo, USP, Ribeirão Preto, SP, Brazil
| | - Letícia Ferreira Ramos
- Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil
| | - Caio Mateus Silva
- Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil
| | - Marina Bonfogo da Silveira
- Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil
| | - Carlos R P Dechant
- Department of Physics and Chemistry, Faculty of Pharmaceutical Sciences of Ribeirão Preto, Universidade de São Paulo, USP, Ribeirão Preto, SP, Brazil
| | - Scott L Friedman
- Division of Liver Diseases, Department of Medicine, Mount Sinai School of Medicine, New York, NY, USA
| | - Kumiko Koibuchi Sakane
- Institute of Research and Development of Universidade do Vale do Paraíba, UNIVAP, São José dos Campos, SP, Brazil
| | - Letícia Rocha Gonçalves
- Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil
| | - Karen C M Moraes
- Molecular Biology Laboratory, Department of Biology, Bioscience Institute, Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Rio Claro, SP, Brazil.
| |
Collapse
|
26
|
Kim KM, Han CY, Kim JY, Cho SS, Kim YS, Koo JH, Lee JM, Lim SC, Kang KW, Kim JS, Hwang SJ, Ki SH, Kim SG. Gα 12 overexpression induced by miR-16 dysregulation contributes to liver fibrosis by promoting autophagy in hepatic stellate cells. J Hepatol 2018; 68:493-504. [PMID: 29080810 PMCID: PMC5818314 DOI: 10.1016/j.jhep.2017.10.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 10/10/2017] [Accepted: 10/11/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Hepatic stellate cells (HSCs) have a role in liver fibrosis. Guanine nucleotide-binding α-subunit 12 (Gα12) converges signals from G-protein-coupled receptors whose ligand levels are elevated in the environment during liver fibrosis; however, information is lacking on the effect of Gα12 on HSC trans-differentiation. This study investigated the expression of Gα12 in HSCs and the molecular basis of the effects of its expression on liver fibrosis. METHODS Gα12 expression was assessed by immunostaining, and immunoblot analyses of mouse fibrotic liver tissues and primary HSCs. The role of Gα12 in liver fibrosis was estimated using a toxicant injury mouse model with Gα12 gene knockout and/or HSC-specific Gα12 delivery using lentiviral vectors, in addition to primary HSCs and LX-2 cells using microRNA (miR) inhibitors, overexpression vectors, or adenoviruses. miR-16, Gα12, and LC3 were also examined in samples from patients with fibrosis. RESULTS Gα12 was overexpressed in activated HSCs and fibrotic liver, and was colocalised with desmin. In a carbon tetrachloride-induced fibrosis mouse model, Gα12 ablation prevented increases in fibrosis and liver injury. This effect was attenuated by HSC-specific lentiviral delivery of Gα12. Moreover, Gα12 activation promoted autophagy accompanying c-Jun N-terminal kinase-dependent ATG12-5 conjugation. In addition, miR-16 was found to be a direct inhibitor of the de novo synthesis of Gα12. Modulations of miR-16 altered autophagy in HSCs. In a fibrosis animal model or patients with severe fibrosis, miR-16 levels were lower than in their corresponding controls. Consistently, cirrhotic patient liver tissues showed Gα12 and LC3 upregulation in desmin-positive areas. CONCLUSIONS miR-16 dysregulation in HSCs results in Gα12 overexpression, which activates HSCs by facilitating autophagy through ATG12-5 formation. This suggests that Gα12 and its regulatory molecules could serve as targets for the amelioration of liver fibrosis. LAY SUMMARY Guanine nucleotide-binding α-subunit 12 (Gα12) is upregulated in activated hepatic stellate cells (HSCs) as a consequence of the dysregulation of a specific microRNA that is abundant in HSCs, facilitating the progression of liver fibrosis. This event is mediated by c-Jun N-terminal kinase-dependent ATG12-5 formation and the promotion of autophagy. We suggest that Gα12 and its associated regulators could serve as new targets in HSCs for the treatment of liver fibrosis.
Collapse
Affiliation(s)
- Kyu Min Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Chang Yeob Han
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Ji Young Kim
- College of Pharmacy, Chosun University, Gwangju 61452, Republic of Korea
| | - Sam Seok Cho
- College of Pharmacy, Chosun University, Gwangju 61452, Republic of Korea
| | - Yun Seok Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Ja Hyun Koo
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Jung Min Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Sung Chul Lim
- College of Medicine, Chosun University, Gwangju 61452, Republic of Korea
| | - Keon Wook Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Jae-Sung Kim
- Departments of Surgery University of Florida, Gainesville, FL 32611, USA
| | - Se Jin Hwang
- College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Sung Hwan Ki
- College of Pharmacy, Chosun University, Gwangju 61452, Republic of Korea
| | - Sang Geon Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 08826, Republic of Korea.
| |
Collapse
|
27
|
Lin J, Zheng S, Attie AD, Keller MP, Bernlohr DA, Blaner WS, Newberry EP, Davidson NO, Chen A. Perilipin 5 and liver fatty acid binding protein function to restore quiescence in mouse hepatic stellate cells. J Lipid Res 2018; 59:416-428. [PMID: 29317465 DOI: 10.1194/jlr.m077487] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 12/07/2017] [Indexed: 12/23/2022] Open
Abstract
Hepatic stellate cell (HSC) activation occurs along with decreased Perilipin5 (Plin5) and liver fatty acid-binding protein (L-Fabp) expression and coincident lipid droplet (LD) depletion. Conversely, the activated phenotype is reversible in WT HSCs upon forced expression of Plin5. Here, we asked if L-Fabp expression is required for Plin5-mediated rescue of the quiescent phenotype. Lentiviral Plin5 transduction of passaged L-Fabp-/- HSCs failed to reverse activation markers or restore lipogenic gene expression and LD formation. However, adenoviral L-Fabp infection of lentiviral Plin5 transduced L-Fabp-/- HSCs restored both the quiescent phenotype and LD formation, an effect also mediated by adenoviral intestine-Fabp or adipocyte-Fabp. Expression of exogenous Plin5 in activated WT HSCs induced a transcriptional program of lipogenic gene expression including endogenous L-Fabp, but none of the other FABPs. We further demonstrated that selective, small molecule inhibition of endogenous L-Fabp also eliminated the ability of exogenous Plin5 to rescue LD formation and reverse activation of WT HSCs. This functional coordination of L-Fabp with Plin5 was 5'-AMP-activated protein kinase (AMPK)-dependent and was eliminated by AMPK inhibition. Taken together, our results indicate that L-Fabp is required for Plin5 to activate a transcriptional program that restores LD formation and reverses HSC activation.
Collapse
Affiliation(s)
- Jianguo Lin
- Department of Pathology, School of Medicine, Saint Louis University, St. Louis, MO.,Department of Neurology, Guangdong Second Provincial General Hospital, Guangzhou, China
| | - Shizhong Zheng
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Alan D Attie
- Department of Biochemistry, Molecular Biology and Biophysics, University of Wisconsin, Madison, WI, 53706
| | - Mark P Keller
- Department of Biochemistry, Molecular Biology and Biophysics, University of Wisconsin, Madison, WI, 53706
| | - David A Bernlohr
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455
| | | | - Elizabeth P Newberry
- Gastroenterology Division, Washington University School of Medicine, St. Louis, MO 63110
| | - Nicholas O Davidson
- Gastroenterology Division, Washington University School of Medicine, St. Louis, MO 63110
| | - Anping Chen
- Department of Pathology, School of Medicine, Saint Louis University, St. Louis, MO
| |
Collapse
|
28
|
Chen J, Yu Y, Li S, Liu Y, Zhou S, Cao S, Yin J, Li G. MicroRNA-30a ameliorates hepatic fibrosis by inhibiting Beclin1-mediated autophagy. J Cell Mol Med 2017; 21:3679-3692. [PMID: 28766848 PMCID: PMC5706581 DOI: 10.1111/jcmm.13278] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 05/18/2017] [Indexed: 12/21/2022] Open
Abstract
We explored the role of microRNA-30a (miR-30a) and the mechanism involved in hepatic fibrosis. MiR-30a overexpression was achieved by miR-30a mimics transfection in hepatic stellate cells (HSCs) (HSC-T6, LX-2), and miR-30a agomir (ago-miR-30a) treatment in mice. MiR-30a levels were measured using TaqMan miRNA assay system, and the localization of miR-30a was detected by fluorescence in situ hybridization (FISH). The interaction of miR-30a and Beclin1 was confirmed by dual-luciferase reporter assay. Autophagic flux was analysed using tandem mRFP-GFP-LC3 fluorescence microscopy, electron microscopy and Western blot of LC3-II/I ratio. MiR-30a was notably down-regulated in activated HSCs and LX-2-exosomes induced by TGF-β1; overexpression of miR-30a down-regulated extracellular matrix (ECM), such as α-SMA, TIMP-1, and Collagen I expression, and suppressed cell viability in HSCs. MiR-30a was significantly down-regulated in hepatic fibrosis mice and overexpression of miR-30a prevented BDL-induced fibrogenesis, concomitant with the down-regulation of ECM. MiR-30a inhibited HSCs autophagy and increased lipid accumulation in HSCs and in mice fibrotic hepatic tissues. MiR-30a inhibited its downstream effector of Beclin1 by direct targeting its 3'-UTR region. Moreover, Knock-down of Beclin1 by small interfering RNA (siRNA) inhibited HSC autophagy and activation in LX-2 cells. In conclusion, miR-30a is down-regulated in hepatic fibrosis models and its overexpression prevents liver fibrogenesis by directly suppressing Beclin1-mediated autophagy; therefore, miR-30a may be a new potential therapeutic target for controlling hepatic fibrosis.
Collapse
Affiliation(s)
- Jianliang Chen
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
- Department of General SurgeryPeople's HospitalJingjiangJiangsu ProvinceChina
| | - Yue Yu
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
| | - Shu Li
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
| | - Yuting Liu
- Department of Pediatric SurgeryHuai'an First Hospital Affiliated to Nanjing Medical UniversityHuai'anJiangsu ProvinceChina
| | - Shu Zhou
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
| | - Shouji Cao
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
| | - Jie Yin
- Department of Respiratory MedicineJinling HospitalNanjingJiangsu ProvinceChina
| | - Guoqiang Li
- Department of Liver SurgeryThe First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina
- Key Laboratory of Living Donor Liver Transplantation of Ministry of Public HealthNanjingJiangsu ProvinceChina
| |
Collapse
|
29
|
AQP3 is regulated by PPARγ and JNK in hepatic stellate cells carrying PNPLA3 I148M. Sci Rep 2017; 7:14661. [PMID: 29116096 PMCID: PMC5676689 DOI: 10.1038/s41598-017-14557-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/11/2017] [Indexed: 01/30/2023] Open
Abstract
Aquaglyceroporins (AQPs) allow the movement of glycerol that is required for triglyceride formation in hepatic stellate cells (HSC), as key cellular source of fibrogenesis in the liver. The genetic polymorphism I148M of the patatin-like phospholipase domain-containing 3 (PNPLA3) is associated with hepatic steatosis and its progression to steatohepatitis (NASH), fibrosis and cancer. We aimed to explore the role of AQP3 for HSC activation and unveil its potential interactions with PNPLA3. HSC were isolated from human liver, experiments were performed in primary HSC and human HSC line LX2. AQP3 was the only aquaglyceroporin present in HSC and its expression decreased during activation. The PPARγ agonist, rosiglitazone, recovered AQP3 expression also in PNPLA3 I148M carrying HSC. When PNPLA3 was silenced, AQP3 expression increased. In liver sections from patients with NASH, the decreased amount of AQP3 was proportional to the severity of fibrosis and presence of the PNPLA3 I148M variant. In PNPLA3 I148M cells, the blockade of JNK pathway upregulated AQP3 in synergism with PPARγ. In conclusion, we demonstrated profound reduction of AQP3 in HSC carrying the PNPLA3 I148M variant in parallel to decreased PPARγ activation, which could be rescued by rosiglitazone and blockade of JNK.
Collapse
|
30
|
Nielsen MFB, Mortensen MB, Detlefsen S. Identification of markers for quiescent pancreatic stellate cells in the normal human pancreas. Histochem Cell Biol 2017; 148:359-380. [PMID: 28540429 DOI: 10.1007/s00418-017-1581-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/13/2017] [Indexed: 12/16/2022]
Abstract
Pancreatic stellate cells (PSCs) play a central role as source of fibrogenic cells in pancreatic cancer and chronic pancreatitis. In contrast to quiescent hepatic stellate cells (qHSCs), a specific marker for quiescent PSCs (qPSCs) that can be used in formalin-fixed and paraffin embedded (FFPE) normal human pancreatic tissue has not been identified. The aim of this study was to identify a marker enabling the identification of qPSCs in normal human FFPE pancreatic tissue. Immunohistochemical (IHC), double-IHC, immunofluorescence (IF) and double-IF analyses were carried out using a tissue microarray consisting of cores with normal human pancreatic tissue. Cores with normal human liver served as control. Antibodies directed against adipophilin, α-SMA, CD146, CRBP-1, cytoglobin, desmin, GFAP, nestin, S100A4 and vinculin were examined, with special emphasis on their expression in periacinar cells in the normal human pancreas and perisinusoidal cells in the normal human liver. The immunolabelling capacity was evaluated according to a semiquantitative scoring system. Double-IF of the markers of interest together with markers for other periacinar cells was performed. Moreover, the utility of histochemical stains for the identification of human qPSCs was examined, and their ultrastructure was revisited by electron microscopy. Adipophilin, CRBP-1, cytoglobin and vinculin were expressed in qHSCs in the liver, whereas cytoglobin and adipophilin were expressed in qPSCs in the pancreas. Adipophilin immunohistochemistry was highly dependent on the preanalytical time interval (PATI) from removal of the tissue to formalin fixation. Cytoglobin, S100A4 and vinculin were expressed in periacinar fibroblasts (FBs). The other examined markers were negative in human qPSCs. Our data indicate that cytoglobin and adipophilin are markers of qPSCs in the normal human pancreas. However, the use of adipophilin as a qPSC marker may be limited due to its high dependence on optimal PATI. Cytoglobin, on the other hand, is a sensitive marker for qPSCs but is expressed in FBs as well.
Collapse
Affiliation(s)
- Michael Friberg Bruun Nielsen
- Department of Pathology, Odense University Hospital, J.B. Winsløws Vej 15, 5000, Odense C, Denmark.,Department of Clinical Research, University of Southern Denmark, J.B. Winsløws Vej 19, 5000, Odense C, Denmark
| | - Michael Bau Mortensen
- Department of Clinical Research, University of Southern Denmark, J.B. Winsløws Vej 19, 5000, Odense C, Denmark.,Department of Surgery, HPB Section, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark
| | - Sönke Detlefsen
- Department of Pathology, Odense University Hospital, J.B. Winsløws Vej 15, 5000, Odense C, Denmark. .,Department of Clinical Research, University of Southern Denmark, J.B. Winsløws Vej 19, 5000, Odense C, Denmark.
| |
Collapse
|
31
|
Chen M, Liu J, Yang L, Ling W. AMP-activated protein kinase regulates lipid metabolism and the fibrotic phenotype of hepatic stellate cells through inhibition of autophagy. FEBS Open Bio 2017; 7:811-820. [PMID: 28593136 PMCID: PMC5458462 DOI: 10.1002/2211-5463.12221] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/21/2017] [Accepted: 03/27/2017] [Indexed: 12/20/2022] Open
Abstract
Hepatic stellate cells (HSCs) are the principal hepatic cell type responsible for liver fibrosis. Although AMP-activated protein kinase (AMPK) is known to regulate the activation of HSCs, little is known about its underlying molecular mechanisms. In the present study, we demonstrate that AMPK activation by 5-aminoimidazole-4-carboxamide-1-4-ribofuranoside (AICAR) restricts the fibrotic potential elicited by transforming growth factor β (TGF-β) in LX-2 cells through modulation of autophagy. AICAR treatment activated the mechanistic target of rapamycin/Akt pathway and thus inhibited autophagy flux and lipid droplet degradation in lysosomes induced by TGF-β. Pretreatment with the autophagy inducer rapamycin reversed the effects of AMPK, further confirming that AICAR inhibited TGF-β-induced HSC activation via the regulation of autophagy flux. Our study indicates that AICAR exerts its anti-fibrotic and anti-lipid depletion effect, at least in part, by inhibiting TGF-β-induced autophagy flux.
Collapse
Affiliation(s)
- Ming Chen
- Department of Nutrition School of Public Health Sun Yat-Sen University Guangzhou Guangdong China.,Guangdong Provincial Key Laboratory of Food, Nutrition and Health Guangzhou Guangdong China
| | - Jiaxing Liu
- Department of Nutrition School of Public Health Sun Yat-Sen University Guangzhou Guangdong China.,Guangdong Provincial Key Laboratory of Food, Nutrition and Health Guangzhou Guangdong China
| | - Lili Yang
- Department of Nutrition School of Public Health Sun Yat-Sen University Guangzhou Guangdong China.,Guangdong Provincial Key Laboratory of Food, Nutrition and Health Guangzhou Guangdong China
| | - Wenhua Ling
- Department of Nutrition School of Public Health Sun Yat-Sen University Guangzhou Guangdong China.,Guangdong Provincial Key Laboratory of Food, Nutrition and Health Guangzhou Guangdong China
| |
Collapse
|
32
|
Natarajan SK, Rasineni K, Ganesan M, Feng D, McVicker BL, McNiven MA, Osna NA, Mott JL, Casey CA, Kharbanda KK. Structure, Function and Metabolism of Hepatic and Adipose Tissue Lipid Droplets: Implications in Alcoholic Liver Disease. Curr Mol Pharmacol 2017; 10:237-248. [PMID: 26278390 PMCID: PMC4820363 DOI: 10.2174/1874467208666150817111727] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 08/07/2015] [Accepted: 08/07/2015] [Indexed: 02/08/2023]
Abstract
For more than 30 years, lipid droplets (LDs) were considered as an inert bag of lipid for storage of energy-rich fat molecules. Following a paradigm shift almost a decade ago, LDs are presently considered an active subcellular organelle especially designed for assembling, storing and subsequently supplying lipids for generating energy and membrane synthesis (and in the case of hepatocytes for VLDL secretion). LDs also play a central role in many other cellular functions such as viral assembly and protein degradation. Here, we have explored the structural and functional changes that occur in hepatic and adipose tissue LDs following chronic ethanol consumption in relation to their role in the pathogenesis of alcoholic liver injury.
Collapse
Affiliation(s)
| | - Karuna Rasineni
- Research Service, VA Nebraska-Western Iowa Health Care System (VA NWIHCS). 0
| | - Murali Ganesan
- Research Service, VA Nebraska-Western Iowa Health Care System (VA NWIHCS). 0
| | - Dan Feng
- Research Service, VA Nebraska-Western Iowa Health Care System (VA NWIHCS). 0
| | - Benita L McVicker
- Research Service, VA Nebraska-Western Iowa Health Care System (VA NWIHCS). 0
| | - Mark A McNiven
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota. United States
| | - Natalia A Osna
- Research Service, VA Nebraska-Western Iowa Health Care System (VA NWIHCS). 0
| | - Justin L Mott
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center. 0
| | - Carol A Casey
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center. 0
| | - Kusum K Kharbanda
- Veterans Affairs Nebraska Western Iowa Health Care System, Research Service (151), 4101 Woolworth Avenue, Omaha, Nebraska, 68105. United States
| |
Collapse
|
33
|
Perilipin 5 restores the formation of lipid droplets in activated hepatic stellate cells and inhibits their activation. J Transl Med 2016; 96:791-806. [PMID: 27135793 DOI: 10.1038/labinvest.2016.53] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 02/10/2016] [Accepted: 03/07/2016] [Indexed: 12/15/2022] Open
Abstract
Hepatic stellate cells (HSC) are major effectors during hepatic fibrogenesis. The activation of HSC is coupled to the loss of lipid droplets (LDs), which are specialized organelles composed of neutral lipids surrounded by perilipins. LDs have emerged as a focal point of interest in understanding the metabolic regulation of intrahepatic lipids during lipid-mediated liver fibrogenesis. Perilipin 5 (Plin5) is a newly identified LD protein in the perilipin family, which plays a key role in regulating aspects of intracellular trafficking, signaling, and cytoskeletal organization in hepatocytes. Recent work in Plin5 knockout mice suggests a role in high fat diet-induced hepatic lipotoxicity. The current report is to evaluate the impact of Plin5 on HSC activation and to elucidate the underlying mechanisms. We now show that high fat diet-induced liver fibrosis is accompanied by an approximate 75% reduction in Plin5 in HSC, and that spontaneous activation of primary HSC produces temporally coincident loss of Plin5 expression and LD depletion. As modulating lipid content in HSC is a suggested strategy for inhibition of HSC activation and treatment of hepatic fibrosis, we asked whether exogenous Plin5 expression in primary HSC would reverse the activation phenotype and promote LD formation. Recombinant lentiviral Plin5 expression in primary mouse HSC restored the formation of LDs, increased lipid content by inducing expression of pro-lipogenic genes and suppressing expression of pro-lipolytic genes, and suppressed HSC activation (~two fold reduction in expression of procollagen and α-smooth muscle actin, two unique biomarkers for activated HSC). In addition, the expression of exogenous Plin5 in HSC attenuated cellular oxidative stress by reducing cellular reactive oxygen species, elevating cellular glutathione, and inducing gene expression of glutamate-cysteine ligase. Taken together, our results indicate that expression of Plin5 plays a critical role in the formation of LDs, the elevation of lipid content in HSC, and the inhibition of the activation of HSC.
Collapse
|
34
|
Nwosu ZC, Alborzinia H, Wölfl S, Dooley S, Liu Y. Evolving Insights on Metabolism, Autophagy, and Epigenetics in Liver Myofibroblasts. Front Physiol 2016; 7:191. [PMID: 27313533 PMCID: PMC4887492 DOI: 10.3389/fphys.2016.00191] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 05/12/2016] [Indexed: 12/14/2022] Open
Abstract
Liver myofibroblasts (MFB) are crucial mediators of extracellular matrix (ECM) deposition in liver fibrosis. They arise mainly from hepatic stellate cells (HSCs) upon a process termed “activation.” To a lesser extent, and depending on the cause of liver damage, portal fibroblasts, mesothelial cells, and fibrocytes may also contribute to the MFB population. Targeting MFB to reduce liver fibrosis is currently an area of intense research. Unfortunately, a clog in the wheel of antifibrotic therapies is the fact that although MFB are known to mediate scar formation, and participate in liver inflammatory response, many of their molecular portraits are currently unknown. In this review, we discuss recent understanding of MFB in health and diseases, focusing specifically on three evolving research fields: metabolism, autophagy, and epigenetics. We have emphasized on therapeutic prospects where applicable and mentioned techniques for use in MFB studies. Subsequently, we highlighted uncharted territories in MFB research to help direct future efforts aimed at bridging gaps in current knowledge.
Collapse
Affiliation(s)
- Zeribe C Nwosu
- Molecular Hepatology Section, Department of Medicine II, Medical Faculty Mannheim, University of Heidelberg Mannheim, Germany
| | - Hamed Alborzinia
- Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg Heidelberg, Germany
| | - Stefan Wölfl
- Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg Heidelberg, Germany
| | - Steven Dooley
- Molecular Hepatology Section, Department of Medicine II, Medical Faculty Mannheim, University of Heidelberg Mannheim, Germany
| | - Yan Liu
- Molecular Hepatology Section, Department of Medicine II, Medical Faculty Mannheim, University of Heidelberg Mannheim, Germany
| |
Collapse
|
35
|
Shearn CT, Fritz KS, Shearn AH, Saba LM, Mercer KE, Engi B, Galligan JJ, Zimniak P, Orlicky DJ, Ronis MJ, Petersen DR. Deletion of GSTA4-4 results in increased mitochondrial post-translational modification of proteins by reactive aldehydes following chronic ethanol consumption in mice. Redox Biol 2015; 7:68-77. [PMID: 26654979 PMCID: PMC4683459 DOI: 10.1016/j.redox.2015.11.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 11/23/2015] [Accepted: 11/25/2015] [Indexed: 12/21/2022] Open
Abstract
Chronic alcohol consumption induces hepatic oxidative stress resulting in production of highly reactive electrophilic α/β-unsaturated aldehydes that have the potential to modify proteins. A primary mechanism of reactive aldehyde detoxification by hepatocytes is through GSTA4-driven enzymatic conjugation with GSH. Given reports that oxidative stress initiates GSTA4 translocation to the mitochondria, we hypothesized that increased hepatocellular damage in ethanol (EtOH)-fed GSTA4−/− mice is due to enhanced mitochondrial protein modification by reactive aldehydes. Chronic ingestion of EtOH increased hepatic protein carbonylation in GSTA4−/− mice as evidenced by increased 4-HNE and MDA immunostaining in the hepatic periportal region. Using mass spectrometric analysis of biotin hydrazide conjugated carbonylated proteins, a total of 829 proteins were identified in microsomal, cytosolic and mitochondrial fractions. Of these, 417 were novel to EtOH models. Focusing on mitochondrial fractions, 1.61-fold more carbonylated proteins were identified in EtOH-fed GSTA4−/− mice compared to their respective WT mice ingesting EtOH. Bioinformatic KEGG pathway analysis of carbonylated proteins from the mitochondrial fractions revealed an increased propensity for modification of proteins regulating oxidative phosphorylation, glucose, fatty acid, glutathione and amino acid metabolic processes in GSTA4−/− mice. Additional analysis revealed sites of reactive aldehyde protein modification on 26 novel peptides/proteins isolated from either SV/GSTA4−/− PF or EtOH fed mice. Among the peptides/proteins identified, ACSL, ACOX2, MTP, and THIKB contribute to regulation of fatty acid metabolism and ARG1, ARLY, and OAT, which regulate nitrogen and ammonia metabolism having direct relevance to ethanol-induced liver injury. These data define a role for GSTA4-4 in buffering hepatic oxidative stress associated with chronic alcohol consumption and that this GST isoform plays an important role in protecting against carbonylation of mitochondrial proteins. We demonstrate increased mitochondrial carbonylation in GSTA4-4 KO mice chronically fed EtOH. Using LC-MS we identify 829 total carbonylated proteins (417 novel to murine ALD). Pathway analysis revealed a propensity for adduction of fatty acid metabolic and electron transport proteins. Using MS/MS, 26 novel adducted peptides were identified. Reactive aldehyde modification of proteins contributes to pathogenesis of ALD.
Collapse
Affiliation(s)
- Colin T Shearn
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.
| | - Kristofer S Fritz
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, United States
| | | | - Laura M Saba
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, United States
| | - Kelly E Mercer
- Department of Pediatrics, Arkansas Children's Nutrition Center, Little Rock, AR, United States
| | - Bridgette Engi
- Department of Pediatrics, Arkansas Children's Nutrition Center, Little Rock, AR, United States
| | - James J Galligan
- Department of Biochemistry, Vanderbilt, Nashville, TN, United States
| | - Piotr Zimniak
- Department of Pediatrics, Arkansas Children's Nutrition Center, Little Rock, AR, United States
| | - David J Orlicky
- Department of Pathology, School of Medicine, University of Colorado Anschutz Medical Center, Aurora, CO, United States
| | - Martin J Ronis
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Dennis R Petersen
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Anschutz Medical Campus, Aurora, CO, United States
| |
Collapse
|
36
|
Eichmann TO, Grumet L, Taschler U, Hartler J, Heier C, Woblistin A, Pajed L, Kollroser M, Rechberger G, Thallinger GG, Zechner R, Haemmerle G, Zimmermann R, Lass A. ATGL and CGI-58 are lipid droplet proteins of the hepatic stellate cell line HSC-T6. J Lipid Res 2015; 56:1972-84. [PMID: 26330055 PMCID: PMC4583087 DOI: 10.1194/jlr.m062372] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 12/31/2022] Open
Abstract
Lipid droplets (LDs) of hepatic stellate cells (HSCs) contain large amounts of vitamin A [in the form of retinyl esters (REs)] as well as other neutral lipids such as TGs. During times of insufficient vitamin A availability, RE stores are mobilized to ensure a constant supply to the body. To date, little is known about the enzymes responsible for the hydrolysis of neutral lipid esters, in particular of REs, in HSCs. In this study, we aimed to identify LD-associated neutral lipid hydrolases by a proteomic approach using the rat stellate cell line HSC-T6. First, we loaded cells with retinol and FAs to promote lipid synthesis and deposition within LDs. Then, LDs were isolated and lipid composition and the LD proteome were analyzed. Among other proteins, we found perilipin 2, adipose TG lipase (ATGL), and comparative gene identification-58 (CGI-58), known and established LD proteins. Bioinformatic search of the LD proteome for α/β-hydrolase fold-containing proteins revealed no yet uncharacterized neutral lipid hydrolases. In in vitro activity assays, we show that rat (r)ATGL, coactivated by rat (r)CGI-58, efficiently hydrolyzes TGs and REs. These findings suggest that rATGL and rCGI-58 are LD-resident proteins in HSCs and participate in the mobilization of both REs and TGs.
Collapse
Affiliation(s)
- Thomas O Eichmann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Lukas Grumet
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Ulrike Taschler
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Jürgen Hartler
- Bioinformatics, Institute for Knowledge Discovery, Graz University of Technology, Graz, Austria
| | - Christoph Heier
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Aaron Woblistin
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Laura Pajed
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Manfred Kollroser
- Institute of Forensic Medicine, Medical University of Graz, Graz, Austria
| | - Gerald Rechberger
- Institute of Molecular Biosciences, University of Graz, Graz, Austria BioTechMed-Graz, Graz, Austria OMICS Center, Graz, Austria
| | - Gerhard G Thallinger
- Bioinformatics, Institute for Knowledge Discovery, Graz University of Technology, Graz, Austria BioTechMed-Graz, Graz, Austria OMICS Center, Graz, Austria
| | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Günter Haemmerle
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Achim Lass
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| |
Collapse
|
37
|
El Taghdouini A, Najimi M, Sancho-Bru P, Sokal E, van Grunsven LA. In vitro reversion of activated primary human hepatic stellate cells. FIBROGENESIS & TISSUE REPAIR 2015; 8:14. [PMID: 26251672 PMCID: PMC4527231 DOI: 10.1186/s13069-015-0031-z] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 07/15/2015] [Indexed: 01/10/2023]
Abstract
Background Liver fibrosis is characterized by the excessive formation and accumulation of matrix proteins as a result of wound healing in the liver. A main event during fibrogenesis is the activation of the liver resident quiescent hepatic stellate cell (qHSC). Recent studies suggest that reversion of the activated HSC (aHSC) phenotype into a quiescent-like phenotype could be a major cellular mechanism underlying fibrosis regression in the liver, thereby offering new therapeutic perspectives for the treatment of liver fibrosis. Whether human HSCs have the ability to undergo a similar reversion in phenotype is currently unknown. The aim of the present study is to identify experimental conditions that can revert the in vitro activated phenotype of primary human HSCs and consequently to map the molecular events associated with this reversion process by gene expression profiling. Results We find that epidermal growth factor (EGF) and fibroblast growth factor 2 (FGF2) synergistically downregulate the expression of ACTA2 and LOX in primary human aHSCs. Their combination with oleic acid, palmitic acid, and retinol further potentiates a more quiescent-like phenotype as demonstrated by the abundant presence of retinyl ester-positive intra-cytoplasmic lipid droplets, low expression levels of activation markers, and a reduced basal as well as cytokine-stimulated proliferation and matrix metalloproteinase activity. Gene expression profiling experiments reveal that these in vitro reverted primary human HSCs (rHSCs) display an intermediary phenotype that is distinct from qHSCs and aHSCs. Interestingly, this intermediary phenotype is characterized by the increased expression of several previously identified signature genes of in vivo inactivated mouse HSCs such as CXCL1, CXCL2, and CTSS, suggesting also a potential role for these genes in promoting a quiescent-like phenotype in human HSCs. Conclusions We provide evidence for the ability of human primary aHSCs to revert in vitro to a transitional state through synergistic action of EGF, FGF2, dietary fatty acids and retinol, and provide a first phenotypic and genomic characterization of human in vitro rHSCs. Electronic supplementary material The online version of this article (doi:10.1186/s13069-015-0031-z) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Adil El Taghdouini
- Liver Cell Biology Lab, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090 Brussels, Belgium
| | - Mustapha Najimi
- Laboratory of Pediatric Hepatology and Cell Therapy, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | - Pau Sancho-Bru
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Etienne Sokal
- Laboratory of Pediatric Hepatology and Cell Therapy, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | - Leo A van Grunsven
- Liver Cell Biology Lab, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090 Brussels, Belgium
| |
Collapse
|
38
|
O’Mahony F, Wroblewski K, O’Byrne SM, Jiang H, Clerkin K, Benhammou J, Blaner WS, Beaven SW. Liver X receptors balance lipid stores in hepatic stellate cells through Rab18, a retinoid responsive lipid droplet protein. Hepatology 2015; 62:615-26. [PMID: 25482505 PMCID: PMC4458237 DOI: 10.1002/hep.27645] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/02/2014] [Indexed: 12/11/2022]
Abstract
UNLABELLED Liver X receptors (LXRs) are determinants of hepatic stellate cell (HSC) activation and liver fibrosis. Freshly isolated HSCs from Lxrαβ(-/-) mice have increased lipid droplet (LD) size, but the functional consequences of this are unknown. Our aim was to determine whether LXRs link cholesterol to retinoid storage in HSCs and how this impacts activation. Primary HSCs from Lxrαβ(-/-) and wild-type mice were profiled by gene array during in vitro activation. Lipid content was quantified by high-performance liquid chromatography and mass spectroscopy. Primary HSCs were treated with nuclear receptor ligands, transfected with small interfering RNA and plasmid constructs, and analyzed by immunocytochemistry. Lxrαβ(-/-) HSCs have increased cholesterol and retinyl esters. The retinoid increase drives intrinsic retinoic acid receptor signaling, and activation occurs more rapidly in Lxrαβ(-/-) HSCs. We identify Rab18 as a novel retinoic acid-responsive, LD-associated protein that helps mediate stellate cell activation. Rab18 mRNA, protein, and membrane insertion increase during activation. Both Rab18 guanosine triphosphatase activity and isoprenylation are required for stellate cell LD loss and induction of activation markers. These phenomena are accelerated in Lxrαβ(-/-) HSCs, where there is greater retinoic acid flux. Conversely, Rab18 knockdown retards LD loss in culture and blocks activation, just like the functional mutants. Rab18 is also induced with acute liver injury in vivo. CONCLUSION Retinoid and cholesterol metabolism are linked in stellate cells by the LD-associated protein Rab18. Retinoid overload helps explain the profibrotic phenotype of Lxrαβ(-/-) mice, and we establish a pivotal role for Rab18 GTPase activity and membrane insertion in wild-type stellate cell activation. Interference with Rab18 may have significant therapeutic benefit in ameliorating liver fibrosis.
Collapse
Affiliation(s)
- Fiona O’Mahony
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Kevin Wroblewski
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Sheila M. O’Byrne
- Department of Medicine, Columbia University, New York, NY 10032, USA
| | - Hongfeng Jiang
- Department of Medicine, Columbia University, New York, NY 10032, USA
| | - Kara Clerkin
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Jihane Benhammou
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, USA
| | - William S. Blaner
- Department of Medicine, Columbia University, New York, NY 10032, USA
| | - Simon W. Beaven
- Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, USA
| |
Collapse
|
39
|
Abstract
Hepatic stellate cells are resident perisinusoidal cells distributed throughout the liver, with a remarkable range of functions in normal and injured liver. Derived embryologically from septum transversum mesenchyme, their precursors include submesothelial cells that invade the liver parenchyma from the hepatic capsule. In normal adult liver, their most characteristic feature is the presence of cytoplasmic perinuclear droplets that are laden with retinyl (vitamin A) esters. Normal stellate cells display several patterns of intermediate filaments expression (e.g., desmin, vimentin, and/or glial fibrillary acidic protein) suggesting that there are subpopulations within this parental cell type. In the normal liver, stellate cells participate in retinoid storage, vasoregulation through endothelial cell interactions, extracellular matrix homeostasis, drug detoxification, immunotolerance, and possibly the preservation of hepatocyte mass through secretion of mitogens including hepatocyte growth factor. During liver injury, stellate cells activate into alpha smooth muscle actin-expressing contractile myofibroblasts, which contribute to vascular distortion and increased vascular resistance, thereby promoting portal hypertension. Other features of stellate cell activation include mitogen-mediated proliferation, increased fibrogenesis driven by connective tissue growth factor, and transforming growth factor beta 1, amplified inflammation and immunoregulation, and altered matrix degradation. Evolving areas of interest in stellate cell biology seek to understand mechanisms of their clearance during fibrosis resolution by either apoptosis, senescence, or reversion, and their contribution to hepatic stem cell amplification, regeneration, and hepatocellular cancer.
Collapse
Affiliation(s)
- Juan E Puche
- Division of Liver Diseases, Icahn School of Medicine at Mount Sinai Hospital, New York, New York, New York
| | | | | |
Collapse
|
40
|
Elpek G&O. Cellular and molecular mechanisms in the pathogenesis of liver fibrosis: An update. World J Gastroenterol 2014; 20:7260-7276. [PMID: 24966597 PMCID: PMC4064072 DOI: 10.3748/wjg.v20.i23.7260] [Citation(s) in RCA: 251] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2013] [Revised: 02/08/2014] [Accepted: 05/26/2014] [Indexed: 02/06/2023] Open
Abstract
There have been considerable recent advances towards a better understanding of the complex cellular and molecular network underlying liver fibrogenesis. Recent data indicate that the termination of fibrogenic processes and the restoration of deficient fibrolytic pathways may allow the reversal of advanced fibrosis and even cirrhosis. Therefore, efforts have been made to better clarify the cellular and molecular mechanisms that are involved in liver fibrosis. Activation of hepatic stellate cells (HSCs) remains a central event in fibrosis, complemented by other sources of matrix-producing cells, including portal fibroblasts, fibrocytes and bone marrow-derived myofibroblasts. These cells converge in a complex interaction with neighboring cells to provoke scarring in response to persistent injury. Defining the interaction of different cell types, revealing the effects of cytokines on these cells and characterizing the regulatory mechanisms that control gene expression in activated HSCs will enable the discovery of new therapeutic targets. Moreover, the characterization of different pathways associated with different etiologies aid in the development of disease-specific therapies. This article outlines recent advances regarding the cellular and molecular mechanisms involved in liver fibrosis that may be translated into future therapies. The pathogenesis of liver fibrosis associated with alcoholic liver disease, non-alcoholic fatty liver disease and viral hepatitis are also discussed to emphasize the various mechanisms involved in liver fibrosis.
Collapse
|
41
|
Mezaki Y, Morii M, Hebiguchi T, Yoshikawa K, Yamaguchi N, Miura M, Imai K, Yoshino H, Senoo H. Differential increases in the expression of intermediate filament proteins and concomitant morphological changes of transdifferentiating rat hepatic stellate cells observed in vitro. Acta Histochem Cytochem 2013; 46:137-43. [PMID: 24194627 PMCID: PMC3813821 DOI: 10.1267/ahc.13007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 08/30/2013] [Indexed: 01/17/2023] Open
Abstract
The primary function of hepatic stellate cells (HSCs) is the storage of vitamin A. However, they are also responsible for liver fibrosis and are therapeutic targets for treatment of liver cirrhosis. Among the many molecular markers that define quiescent or activated states of HSCs, the characteristics of type III intermediate filaments are of particular interest. Whereas vimentin and desmin are upregulated in activated HSCs, glial fibrillary acidic protein is downregulated in activated HSCs. The functional differences between vimentin and desmin are poorly understood. By time-course quantifications of several molecular markers for HSC activation, we observed that the expression of vimentin preceded that of desmin during the transdifferentiation of HSCs. The immunoreactivity of vimentin in transdifferentiated HSCs was more intense in perinuclear regions compared to that of desmin. We propose that the delayed expression of desmin following the expression of vimentin and the peripheral localization of desmin compared to vimentin are both related to the more extended phenotype of transdifferentiating HSCs observed in vitro.
Collapse
Affiliation(s)
- Yoshihiro Mezaki
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| | - Mayako Morii
- Department of Pediatric Surgery, Akita University Graduate School of Medicine
| | - Taku Hebiguchi
- Department of Pediatric Surgery, Akita University Graduate School of Medicine
| | - Kiwamu Yoshikawa
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| | - Noriko Yamaguchi
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| | - Mitsutaka Miura
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| | - Katsuyuki Imai
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| | - Hiroaki Yoshino
- Department of Pediatric Surgery, Akita University Graduate School of Medicine
| | - Haruki Senoo
- Department of Cell Biology and Morphology, Akita University Graduate School of Medicine
| |
Collapse
|
42
|
Chen A, Tang Y, Davis V, Hsu FF, Kennedy SM, Song H, Turk J, Brunt EM, Newberry EP, Davidson NO. Liver fatty acid binding protein (L-Fabp) modulates murine stellate cell activation and diet-induced nonalcoholic fatty liver disease. Hepatology 2013; 57:2202-12. [PMID: 23401290 PMCID: PMC3665693 DOI: 10.1002/hep.26318] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Accepted: 01/31/2013] [Indexed: 12/12/2022]
Abstract
UNLABELLED Activation of hepatic stellate cells (HSCs) is crucial to the development of fibrosis in nonalcoholic fatty liver disease. Quiescent HSCs contain lipid droplets (LDs), whose depletion upon activation induces a fibrogenic gene program. Here we show that liver fatty acid-binding protein (L-Fabp), an abundant cytosolic protein that modulates fatty acid (FA) metabolism in enterocytes and hepatocytes, also modulates HSC FA utilization and in turn regulates the fibrogenic program. L-Fabp expression decreased 10-fold following HSC activation, concomitant with depletion of LDs. Primary HSCs isolated from L-FABP(-/-) mice contain fewer LDs than wild-type (WT) HSCs, and exhibit up-regulated expression of genes involved in HSC activation. Adenoviral L-Fabp transduction inhibited activation of passaged WT HSCs and increased both the expression of prolipogenic genes and also augmented intracellular lipid accumulation, including triglyceride and FA, predominantly palmitate. Freshly isolated HSCs from L-FABP(-/-) mice correspondingly exhibited decreased palmitate in the free FA pool. To investigate whether L-FABP deletion promotes HSC activation in vivo, we fed L-FABP(-/-) and WT mice a high-fat diet supplemented with trans-fatty acids and fructose (TFF). TFF-fed L-FABP(-/-) mice exhibited reduced hepatic steatosis along with decreased LD abundance and size compared to WT mice. In addition, TFF-fed L-FABP(-/-) mice exhibited decreased hepatic fibrosis, with reduced expression of fibrogenic genes, compared to WT mice. CONCLUSION L-FABP deletion attenuates both diet-induced hepatic steatosis and fibrogenesis, despite the observation that L-Fabp paradoxically promotes FA and LD accumulation and inhibits HSC activation in vitro. These findings highlight the importance of cell-specific modulation of hepatic lipid metabolism in promoting fibrogenesis in nonalcoholic fatty liver disease. (Hepatology 2013).
Collapse
Affiliation(s)
- Anping Chen
- Departments of Pathology, School of Medicine, Saint Louis University, Saint Louis, MO. 63104
| | - Youcai Tang
- Departments of Pathology, School of Medicine, Saint Louis University, Saint Louis, MO. 63104
| | - Victoria Davis
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - Fong-Fu Hsu
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - Susan M. Kennedy
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - Haowei Song
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - John Turk
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - Elizabeth M. Brunt
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO. 63110
| | - Elizabeth P. Newberry
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110
| | - Nicholas O. Davidson
- Department of Medicine, Washington University School of Medicine, St. Louis, MO. 63110,Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO. 63110,Corresponding author: Tel: 314-362-2027; Fax: 314-362-2033;
| |
Collapse
|
43
|
Heid H, Rickelt S, Zimbelmann R, Winter S, Schumacher H, Dörflinger Y. Lipid droplets, perilipins and cytokeratins--unravelled liaisons in epithelium-derived cells. PLoS One 2013; 8:e63061. [PMID: 23704888 PMCID: PMC3660578 DOI: 10.1371/journal.pone.0063061] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2012] [Accepted: 03/27/2013] [Indexed: 11/18/2022] Open
Abstract
Lipid droplets (LDs) are spherical accumulations of apolar lipids and other hydrophobic substances and are generally surrounded by a thin cortical layer of specific amphiphilic proteins (APs). These APs segregate the LDs from the mostly polar components of the cytoplasm. We have studied LDs in epithelium-derived cell cultures and in particular characterized proteins from the perilipin (PLIN) gene family - in mammals consisting of the proteins Perilipin, Adipophilin, TIP47, S3-12 and MLDP/OXPAT (PLIN 1-5). Using a large number of newly generated and highly specific mono- and polyclonal antibodies specific for individual APs, and using improved LD isolation methods, we have enriched and characterized APs in greater detail and purity. The majority of lipid-AP complexes could be obtained in the top layer fractions of density gradient centrifugation separations of cultured cells, but APs could also be detected in other fractions within such separations. The differently sized LD complexes were analyzed using various biochemical methods and mass spectrometry as well as immunofluorescence and electron- in particular immunoelectron-microscopy. Moreover, by immunoprecipitation, protein-protein binding assays and by immunoelectron microscopy we identified a direct linkage between LD-binding proteins and the intermediate-sized filaments (IF) cytokeratins 8 and 18 (also designated as keratins K8 and K18). Specifically, in gradient fractions of higher density supposedly containing small LDs, we received as co-precipitations cytidylyl-, palmitoyl- and cholesterol transferases and other specific enzymes involved in lipid metabolism. So far, common proteomic studies have used LDs from top layer fractions only and did not report on these transferases and other enzymes. In addition to findings of short alternating hydrophobic/hydrophilic segments within the PLIN protein family, we propose and discuss a model for the interaction of LD-coating APs with IF proteins.
Collapse
Affiliation(s)
- Hans Heid
- Helmholtz Group for Cell Biology, German Cancer Research Center (DKFZ), Heidelberg, Germany.
| | | | | | | | | | | |
Collapse
|
44
|
Chen Y, Choi SS, Michelotti GA, Chan IS, Swiderska M, Karaca GF, Xie G, Moylan CA, Garibaldi F, Premont R, Suliman HB, Piantodosi CA, Diehl AM. Hedgehog controls hepatic stellate cell fate by regulating metabolism. Gastroenterology 2012; 143:1319-1329.e11. [PMID: 22885334 PMCID: PMC3480563 DOI: 10.1053/j.gastro.2012.07.115] [Citation(s) in RCA: 195] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 07/24/2012] [Accepted: 07/29/2012] [Indexed: 12/16/2022]
Abstract
BACKGROUND & AIMS The pathogenesis of cirrhosis, a disabling outcome of defective liver repair, involves deregulated accumulation of myofibroblasts derived from quiescent hepatic stellate cells (HSCs), but the mechanisms that control transdifferentiation of HSCs are poorly understood. We investigated whether the Hedgehog (Hh) pathway controls the fate of HSCs by regulating metabolism. METHODS Microarray, quantitative polymerase chain reaction, and immunoblot analyses were used to identify metabolic genes that were differentially expressed in quiescent vs myofibroblast HSCs. Glycolysis and lactate production were disrupted in HSCs to determine if metabolism influenced transdifferentiation. Hh signaling and hypoxia-inducible factor 1α (HIF1α) activity were altered to identify factors that alter glycolytic activity. Changes in expression of genes that regulate glycolysis were quantified and localized in biopsy samples from patients with cirrhosis and liver samples from mice following administration of CCl(4) or bile duct ligation. Mice were given systemic inhibitors of Hh to determine if they affect glycolytic activity of the hepatic stroma; Hh signaling was also conditionally disrupted in myofibroblasts to determine the effects of glycolytic activity. RESULTS Transdifferentiation of cultured, quiescent HSCs into myofibroblasts induced glycolysis and caused lactate accumulation. Increased expression of genes that regulate glycolysis required Hh signaling and involved induction of HIF1α. Inhibitors of Hh signaling, HIF1α, glycolysis, or lactate accumulation converted myofibroblasts to quiescent HSCs. In diseased livers of animals and patients, numbers of glycolytic stromal cells were associated with the severity of fibrosis. Conditional disruption of Hh signaling in myofibroblasts reduced numbers of glycolytic myofibroblasts and liver fibrosis in mice; similar effects were observed following administration of pharmacologic inhibitors of Hh. CONCLUSIONS Hedgehog signaling controls the fate of HSCs by regulating metabolism. These findings might be applied to diagnosis and treatment of patients with cirrhosis.
Collapse
Affiliation(s)
- Yuping Chen
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Steve S. Choi
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA,Section of Gastroenterology, Department of Medicine, Durham Veterans Affairs Medical Center, Durham, North Carolina, USA
| | - Gregory A. Michelotti
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Isaac S. Chan
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Marzena Swiderska
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Gamze F. Karaca
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Guanhua Xie
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Cynthia A. Moylan
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA,Section of Gastroenterology, Department of Medicine, Durham Veterans Affairs Medical Center, Durham, North Carolina, USA
| | - Francesca Garibaldi
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Richard Premont
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Hagir B. Suliman
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Claude A. Piantodosi
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA,Department of Anesthesiology, Duke University, Durham, North Carolina, USA,Department of Pathology, Duke University, Durham, North Carolina, USA
| | - Anna Mae Diehl
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, North Carolina.
| |
Collapse
|
45
|
Tanaka S, Takasawa A, Fukasawa Y, Hasegawa T, Sawada N. An undifferentiated embryonal sarcoma of the liver containing adipophilin-positive vesicles in an adult with massive sinusoidal invasion. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2012; 5:824-829. [PMID: 23071865 PMCID: PMC3466983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 08/23/2012] [Indexed: 06/01/2023]
Abstract
Undifferentiated embryonal sarcoma of the liver (UESL) is a malignant mesenchymal tumor that occurs typically in children and rarely in adults. Here we describe a case of UESL in a 51-year-old woman who presented with a cystic lesion in the liver. Because it grew slowly, the anterior segment of the liver was resected to check the lesion. Histologically, the lesion looked like a telangiectatic hepatic adenoma. Two years after resection, the tumor recurred, and she died 3 years later due to liver failure. The autopsy revealed that these lesions were UESL with massive sinusoidal invasion, and a review of the case indicated the primary lesion was also UESL. We also confirmed these tumor cells by staining with CD56, alpha-smooth muscle actin (SMA), and adipophilin, suggesting that they have a character similar to that of stellate cells in the space of Disse. The histological result of our patient revealed atypical UESL. Therefore, UESL should be considered when a hepatic lesion with degeneration is seen, even in an adult. In addition, the immunohistochemical appearance of this case implies that UESL is perhaps derived from stellate cells or stellate cells with myofibroblast differentiation in the space of Disse.
Collapse
Affiliation(s)
- Satoshi Tanaka
- Department of Pathology, Sapporo Medical University School of Medicine Chuou-ku, Minami-1, Sapporo, Japan.
| | | | | | | | | |
Collapse
|
46
|
Imai Y, Boyle S, Varela GM, Caron E, Yin X, Dhir R, Dhir R, Graham MJ, Ahima RS. Effects of perilipin 2 antisense oligonucleotide treatment on hepatic lipid metabolism and gene expression. Physiol Genomics 2012; 44:1125-31. [PMID: 23012396 DOI: 10.1152/physiolgenomics.00045.2012] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the most common liver disease worldwide. We previously showed that Perilipin 2 (Plin2), a member of lipid droplet protein family, is markedly increased in fatty liver, and its reduction in the liver of diet-induced obese mice by antisense oligonucleotide (ASO) decreased steatosis and enhanced insulin sensitivity. Plin2-ASO treatment markedly suppressed lipogenic gene expression. To gain a better understanding of the biological role of Plin2 in liver, we performed microarray analysis to determine genes differentially regulated by Plin2-ASO compared with a control (scrambled) oligonucleotide (Cont). Male C57BL/6J mice on a high-fat diet were treated with Plin2- or Cont-ASO for 4 wk. Plin2-ASO decreased hepatic triglycerides, and this was associated with changes in expression of 1,363 genes. We analyzed the data for functional clustering and validated the expression of representative genes using real-time PCR. On the high-fat diet, Plin2-ASO decreased the expression of enzymes involved in fatty acid metabolism (acsl1, lipe) and steroid metabolism (hmgcr, hsd3b5, hsd17b2), suggesting that Plin2 affects hepatic lipid metabolism at the transcriptional level. Plin2-ASO also increased the expression of genes involved in regulation of hepatocyte proliferation (afp, H19), mitosis (ccna2, incenp, sgol1), and extracellular matrix (col1a1, col3a1, mmp8). Plin2-ASO had similar effects on gene expression in chow-fed mice. Together, these results indicate that Plin2 has diverse metabolic and structural roles in the liver, and its downregulation promotes hepatic fibrosis and proliferation.
Collapse
Affiliation(s)
- Yumi Imai
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, and the Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104-5160, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Hernández-Gea V, Ghiassi-Nejad Z, Rozenfeld R, Gordon R, Fiel MI, Yue Z, Czaja MJ, Friedman SL. Autophagy releases lipid that promotes fibrogenesis by activated hepatic stellate cells in mice and in human tissues. Gastroenterology 2012; 142:938-46. [PMID: 22240484 PMCID: PMC3439519 DOI: 10.1053/j.gastro.2011.12.044] [Citation(s) in RCA: 485] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 12/29/2011] [Accepted: 12/31/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS The pathogenesis of liver fibrosis involves activation of hepatic stellate cells, which is associated with depletion of intracellular lipid droplets. When hepatocytes undergo autophagy, intracellular lipids are degraded in lysosomes. We investigated whether autophagy also promotes loss of lipids in hepatic stellate cells to provide energy for their activation and extended these findings to other fibrogenic cells. METHODS We analyzed hepatic stellate cells from C57BL/6 wild-type, Atg7(F/F), and Atg7(F/F)-GFAP-Cre mice, as well as the mouse stellate cell line JS1. Fibrosis was induced in mice using CCl(4) or thioacetamide (TAA); liver tissues and stellate cells were analyzed. Autophagy was blocked in fibrogenic cells from liver and other tissues using small interfering RNAs against Atg5 or Atg7 and chemical antagonists. Human pulmonary fibroblasts were isolated from samples of lung tissue from patients with idiopathic pulmonary fibrosis or from healthy donors. RESULTS In mice, induction of liver injury with CCl(4) or TAA increased levels of autophagy. We also observed features of autophagy in activated stellate cells within injured human liver tissue. Loss of autophagic function in cultured mouse stellate cells and in mice following injury reduced fibrogenesis and matrix accumulation; this effect was partially overcome by providing oleic acid as an energy substrate. Autophagy also regulated expression of fibrogenic genes in embryonic, lung, and renal fibroblasts. CONCLUSIONS Autophagy of activated stellate cells is required for hepatic fibrogenesis in mice. Selective reduction of autophagic activity in fibrogenic cells in liver and other tissues might be used to treat patients with fibrotic diseases.
Collapse
Affiliation(s)
- Virginia Hernández-Gea
- Division of Liver Diseases, Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029-6574, USA
| | | | | | | | | | | | | | | |
Collapse
|
48
|
Yin P, Roqueiro D, Huang L, Owen JK, Xie A, Navarro A, Monsivais D, Coon V JS, Kim JJ, Dai Y, Bulun SE. Genome-wide progesterone receptor binding: cell type-specific and shared mechanisms in T47D breast cancer cells and primary leiomyoma cells. PLoS One 2012; 7:e29021. [PMID: 22272226 PMCID: PMC3260146 DOI: 10.1371/journal.pone.0029021] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 11/18/2011] [Indexed: 01/16/2023] Open
Abstract
Background Progesterone, via its nuclear receptor (PR), exerts an overall tumorigenic effect on both uterine fibroid (leiomyoma) and breast cancer tissues, whereas the antiprogestin RU486 inhibits growth of these tissues through an unknown mechanism. Here, we determined the interaction between common or cell-specific genome-wide binding sites of PR and mRNA expression in RU486-treated uterine leiomyoma and breast cancer cells. Principal Findings ChIP-sequencing revealed 31,457 and 7,034 PR-binding sites in breast cancer and uterine leiomyoma cells, respectively; 1,035 sites overlapped in both cell types. Based on the chromatin-PR interaction in both cell types, we statistically refined the consensus progesterone response element to G•ACA• • •TGT•C. We identified two striking differences between uterine leiomyoma and breast cancer cells. First, the cis-regulatory elements for HSF, TEF-1, and C/EBPα and β were statistically enriched at genomic RU486/PR-targets in uterine leiomyoma, whereas E2F, FOXO1, FOXA1, and FOXF sites were preferentially enriched in breast cancer cells. Second, 51.5% of RU486-regulated genes in breast cancer cells but only 6.6% of RU486-regulated genes in uterine leiomyoma cells contained a PR-binding site within 5 kb from their transcription start sites (TSSs), whereas 75.4% of RU486-regulated genes contained a PR-binding site farther than 50 kb from their TSSs in uterine leiomyoma cells. RU486 regulated only seven mRNAs in both cell types. Among these, adipophilin (PLIN2), a pro-differentiation gene, was induced via RU486 and PR via the same regulatory region in both cell types. Conclusions Our studies have identified molecular components in a RU486/PR-controlled gene network involved in the regulation of cell growth, cell migration, and extracellular matrix function. Tissue-specific and common patterns of genome-wide PR binding and gene regulation may determine the therapeutic effects of antiprogestins in uterine fibroids and breast cancer.
Collapse
Affiliation(s)
- Ping Yin
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Damian Roqueiro
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Lei Huang
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Jonas K. Owen
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Anna Xie
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Antonia Navarro
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Diana Monsivais
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - John S. Coon V
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - J. Julie Kim
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Yang Dai
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois, United States of America
- * E-mail: (YD); (SEB)
| | - Serdar E. Bulun
- Division of Reproductive Biology Research, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
- * E-mail: (YD); (SEB)
| |
Collapse
|
49
|
Sauvant P, Cansell M, Atgié C. Vitamin A and lipid metabolism: relationship between hepatic stellate cells (HSCs) and adipocytes. J Physiol Biochem 2011; 67:487-96. [PMID: 21626400 DOI: 10.1007/s13105-011-0101-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 05/11/2011] [Indexed: 12/23/2022]
Abstract
Vitamin A or retinol plays a major role in the regulation of cellular homeostasis. Retinyl palmitate remains the main chemical form of vitamin A storage and is mainly located in hepatic stellate cells (HSCs) in lipid droplets resembling those found in adipose cells. White adipose tissue (WAT), is essentially involved in the regulation of lipid metabolism, through its role in lipid storage, and might also be considered as a vitamin A storage and metabolism site. WAT contains all the intracellular equipment for vitamin A metabolism and signaling pathways which allows retinol to be metabolized into retinoic acid, known to control genomic expression in WAT. The description of molecular mechanisms involved in the activation of HSCs and the differentiation of preadipocytes reveal similar cellular and molecular mechanisms. Indeed HSCs and adipocytes share a common expression of key transcription factors like PPAR-γ and RXR known to influence perilipin expression, which play fundamental roles in lipid droplet metabolism. Both cells are also sources of important endocrine signaling secretions influencing the expression of these transcription factors. The morphological and functional characteristics of HSCs and adipocytes, including the metabolism of vitamin A and other lipids and their related signaling pathways, are summarized and compared in this review. We highlight the complexity of the interrelationship between lipids and vitamin A metabolism and the role of the complex communication existing between HSCs and WAT in diseases such as non-alcoholic fatty liver disease which is the hepatic manifestation of the metabolic syndrome.
Collapse
Affiliation(s)
- Patrick Sauvant
- UMR 5248 CBMN Chimie et Biologie des Membranes et des Nanoobjets, CNRS, Université de Bordeaux, Institut Polytechnique de Bordeaux, Allée Geoffroy de St Hilaire, Pessac, Bordeaux, France.
| | | | | |
Collapse
|