1
|
Zhou AL, Ward RE. Dietary milk polar lipids modulate gut barrier integrity and lipid metabolism in C57BL/6J mice during systemic inflammation induced by Escherichia coli lipopolysaccharide. J Dairy Sci 2024:S0022-0302(24)00863-4. [PMID: 38825111 DOI: 10.3168/jds.2024-24759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 04/22/2024] [Indexed: 06/04/2024]
Abstract
The focus of this work is the role milk polar lipids play in affecting gut permeability, systemic inflammation, and lipid metabolism during acute and chronic inflammation induced by a single subcutaneous injection of lipopolysaccharide. Three groups of C57BL/6J mice were fed: modified AIN-93G diet with moderate level of fat (CO); CO with milk gangliosides (GG); CO with milk phospholipids (MPL). The MPL did not prevent a gut permeability increase upon LPS stress but increased the expression of tight junction proteins zonula occludens-1 and occludin in colon mucosa. The GG prevented the gut permeability increase upon LPS stress. The MPL decreased absolute and relative liver mass and decreased hepatic gene expression of acetyl-CoA carboxylase 2 and 3-hydroxy-3-methylglutaryl-CoA reductase. The GG increased hepatic gene expression of acetyl-CoA acyltransferase 2. In conclusion, milk GG protected the intestinal barrier integrity but had little effect on systemic inflammation and lipid metabolism; milk MPL, conversely, had complex effects on gut permeability, did not affect systemic inflammation, and had beneficial effect on hepatic lipid metabolism.
Collapse
Affiliation(s)
- Albert Lihong Zhou
- Nutrition, Dietetics and Food Sciences, Utah State University, 8700 Old Main Hill, Logan, UT 84322, USA
| | - Robert E Ward
- Nutrition, Dietetics and Food Sciences, Utah State University, 8700 Old Main Hill, Logan, UT 84322, USA.
| |
Collapse
|
2
|
Feng T, Zhang W, Li Z. Potential Mechanisms of Gut-Derived Extracellular Vesicle Participation in Glucose and Lipid Homeostasis. Genes (Basel) 2022; 13:genes13111964. [PMID: 36360201 PMCID: PMC9689624 DOI: 10.3390/genes13111964] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/24/2022] [Accepted: 10/26/2022] [Indexed: 01/19/2023] Open
Abstract
The intestine participates in the regulation of glucose and lipid metabolism in multiple facets. It is the major site of nutrient digestion and absorption, provides the interface as well as docking locus for gut microbiota, and harbors hormone-producing cells scattered throughout the gut epithelium. Intestinal extracellular vesicles are known to influence the local immune response, whereas their roles in glucose and lipid homeostasis have barely been explored. Hence, this current review summarizes the latest knowledge of cargo substances detected in intestinal extracellular vesicles, and connects these molecules with the fine-tuning regulation of glucose and lipid metabolism in liver, muscle, pancreas, and adipose tissue.
Collapse
Affiliation(s)
- Tiange Feng
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing 100191, China
| | - Weizhen Zhang
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing 100191, China
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
- Correspondence: (W.Z.); (Z.L.); Tel.: +1-734-615-0360 (W.Z.); +1-207-396-8050 (Z.L.)
| | - Ziru Li
- MaineHealth Institute for Research, MaineHealth, Scarborough, ME 04074, USA
- Correspondence: (W.Z.); (Z.L.); Tel.: +1-734-615-0360 (W.Z.); +1-207-396-8050 (Z.L.)
| |
Collapse
|
3
|
Hua K, Wang M, Jin Y, Gao Y, Luo R, Bi D, Zhou R, Jin H. P38 MAPK pathway regulates the expression of resistin in porcine alveolar macrophages via Ets2 during Haemophilus parasuis stimulation. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2022; 128:104327. [PMID: 34863954 DOI: 10.1016/j.dci.2021.104327] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/30/2021] [Accepted: 11/30/2021] [Indexed: 06/13/2023]
Abstract
Haemophilus parasuis is a widespread bacterial pathogen causing acute systemic inflammation and leading to the sudden death of piglets. Resistin, a multifunctional peptide hormone previously demonstrated to influence the inflammation in porcine, was extremely increased in H. parasuis-infected tissues. However, the mechanism of resistin expression regulation in porcine, especially during pathogen infection, remains unclear. In the present study, we explored for the first time the transcription factor and signaling pathway mediating the expression of pig resistin during H. parasuis stimulation. We found that H. parasuis induced the expression of pig resistin in a time- and dose-dependent manner via the transcription factor Ets2 in porcine alveolar macrophages during H. parasuis stimulation. Moreover, the expression of Ets2 was mediated by the activation of the p38 MAPK pathway induced by H. parasuis, thus promoting resistin production. These results revealed a novel view of the molecular mechanism of pig resistin production during acute inflammation induced by pathogenic bacteria.
Collapse
Affiliation(s)
- Kexin Hua
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Mingyang Wang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Yishun Jin
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Yuan Gao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Rui Luo
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Dingren Bi
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Rui Zhou
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China
| | - Hui Jin
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, China; College of Veterinary Medicine, Huazhong Agricultural University, China; Hubei Provincial Key Laboratory of Preventive Veterinary Medicine, Huazhong Agricultural University, China.
| |
Collapse
|
4
|
Jakkawanpitak C, Inafuku M, Oku H, Hutadilok-Towatana N, Bunkrongcheap R, Sermwittayawong N, Aiemchareon P, Sermwittayawong D. Mechanism of the fungal-like particles in the inhibition of adipogenesis in 3T3-L1 adipocytes. Sci Rep 2021; 11:18869. [PMID: 34552185 PMCID: PMC8458348 DOI: 10.1038/s41598-021-98385-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 09/01/2021] [Indexed: 02/08/2023] Open
Abstract
The dynamic ability of adipocytes in adipose tissue to store lipid in response to changes in the nutritional input and inflammatory elicitors has a major impact on human health. Previously, we established laminarin-coated beads or LCB as an inflammatory elicitor for adipocytes. However, it was not clear whether LCB inhibits lipid accumulation in adipocytes. Here, we show that LCB acts in the early stage of adipogenesis through both interleukin-1 receptor-associated kinases (IRAK) and spleen tyrosine kinase (SYK) pathways, resulting in the activation of the AMP-activated protein kinase (AMPK) and nuclear factor-κB (NF-κB) complexes, which subsequently cause cell cycle arrest, downregulation of the key transcription factors and enzymes responsible for adipogenesis, inhibition of adipogenesis, and stimulation of an inflammatory response. While LCB could effectively block lipid accumulation during the early stage of adipogenesis, it could stimulate an inflammatory response at any stage of differentiation. Additionally, our results raise a possibility that toll-like receptor 2 (TLR2) and C-type lectin domain family 7 member A (CLEC7A/Dectin-1) might be potential β-glucan receptors on the fat cells. Together, we present the mechanism of LCB, as fungal-like particles, that elicits an inflammatory response and inhibits adipogenesis at the early stage of differentiation.
Collapse
Affiliation(s)
- Chanawee Jakkawanpitak
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand
| | - Masashi Inafuku
- Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903-0213, Japan
| | - Hirosuke Oku
- Molecular Biotechnology Group, Center of Molecular Biosciences, Tropical Biosphere Research Center, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903-0213, Japan
| | - Nongporn Hutadilok-Towatana
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand
| | - Ruthaiwan Bunkrongcheap
- College of Innovation and Management, Songkhla Rajabhat University, Muang District, Songkhla, 90000, Thailand
| | - Natthawan Sermwittayawong
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand
| | - Piyapat Aiemchareon
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand
- Functional Food and Nutrition Program, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand
| | - Decha Sermwittayawong
- Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, 90110, Songkhla, Thailand.
| |
Collapse
|
5
|
Temporal dynamics of a CSF1R signaling gene regulatory network involved in epilepsy. PLoS Comput Biol 2021; 17:e1008854. [PMID: 33819288 PMCID: PMC8057615 DOI: 10.1371/journal.pcbi.1008854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 04/20/2021] [Accepted: 03/04/2021] [Indexed: 01/16/2023] Open
Abstract
Colony Stimulating Factor 1 Receptor (CSF1R) is a potential target for anti-epileptic drugs. However, inhibition of CSF1R is not well tolerated by patients, thereby prompting the need for alternative targets. To develop a framework for identification of such alternatives, we here develop a mathematical model of a pro-inflammatory gene regulatory network (GRN) involved in epilepsy and centered around CSF1R. This GRN comprises validated transcriptional and post-transcriptional regulations involving STAT1, STAT3, NFκB, IL6R, CSF3R, IRF8, PU1, C/EBPα, TNFR1, CSF1 and CSF1R. The model was calibrated on mRNA levels of all GRN components in lipopolysaccharide (LPS)-treated mouse microglial BV-2 cells, and allowed to predict that STAT1 and STAT3 have the strongest impact on the expression of the other GRN components. Microglial BV-2 cells were selected because, the modules from which the GRN was deduced are enriched for microglial marker genes. The function of STAT1 and STAT3 in the GRN was experimentally validated in BV-2 cells. Further, in silico analysis of the GRN dynamics predicted that a pro-inflammatory stimulus can induce irreversible bistability whereby the expression level of GRN components occurs as two distinct states. The irreversibility of the switch may enforce the need for chronic inhibition of the CSF1R GRN in order to achieve therapeutic benefit. The cell-to-cell heterogeneity driven by the bistability may cause variable therapeutic response. In conclusion, our modeling approach uncovered a GRN controlling CSF1R that is predominantly regulated by STAT1 and STAT3. Irreversible inflammation-induced bistability and cell-to-cell heterogeneity of the GRN provide a theoretical foundation to the need for chronic GRN control and the limited potential for disease modification via inhibition of CSF1R. Epilepsy is associated with the induction of complex molecular inflammatory processes. A better understanding of these molecular mechanisms is crucial to optimize therapeutic options. Here, we identified a gene regulatory network (GRN) involved in epilepsy that is controlled by inflammation and which regulates the expression and function of Colony Stimulating Factor 1 receptor (CSF1R), a therapeutic target for anti-epileptic drugs. Using mathematical modeling and experiments with cultured cells, we found that two of eleven components of the network, namely STAT1 and STAT3, exert a tight control on all other components. In addition, we found that inflammation can induce an irreversible switch in the expression of all components of the network, and can cause high cell-to-cell variability. Our findings provide a framework explaining why chronic, not acute, anti-inflammatory treatment is necessary to modulate the network and why drugs targeting CSF1R have limited therapeutic potential.
Collapse
|
6
|
Resistin: Potential biomarker and therapeutic target in atherosclerosis. Clin Chim Acta 2020; 512:84-91. [PMID: 33248946 DOI: 10.1016/j.cca.2020.11.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022]
Abstract
Resistin, a cysteine-rich secretory protein, has a pleiotropic role in humans. Resistin usually presents as trimer or hexamer in plasma, and targets specific receptors Toll Like Receptor 4 (TLR4) or Adenylyl Cyclase-Associated Protein 1 (CAP1). Upon binding to TLR4 and CAP1, resistin can trigger various intracellular signal transduction pathways to induce vascular inflammation, lipid accumulation, and plaque vulnerability. These pro-atherosclerotic effects of resistin appear in various cell types, including endothelial cells, vessel smooth muscle cells and macrophages, which cause diverse damages to cardiovascular system from dyslipidemia, atherosclerosis rupture and ventricular remodeling. In this review, we gather recent evidence about the pro- atherosclerotic effects of resistin and highlight it as a candidate therapeutic or diagnostic target for cardiovascular disease.
Collapse
|
7
|
Zhou J, Li H, Xia X, Herrera A, Pollock N, Reebye V, Sodergren MH, Dorman S, Littman BH, Doogan D, Huang KW, Habib R, Blakey D, Habib NA, Rossi JJ. Anti-inflammatory Activity of MTL-CEBPA, a Small Activating RNA Drug, in LPS-Stimulated Monocytes and Humanized Mice. Mol Ther 2019; 27:999-1016. [PMID: 30852139 PMCID: PMC6520465 DOI: 10.1016/j.ymthe.2019.02.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/19/2019] [Accepted: 02/20/2019] [Indexed: 12/24/2022] Open
Abstract
Excessive or inappropriate inflammatory responses can cause serious and even fatal diseases. The CCAAT/enhancer-binding protein alpha (CEBPA) gene encodes C/EBPα, a transcription factor that plays a fundamental role in controlling maturation of the myeloid lineage and is also expressed during the late phase of inflammatory responses when signs of inflammation are decreasing. MTL-CEBPA, a small activating RNA targeting for upregulation of C/EBPα, is currently being evaluated in a phase 1b trial for treatment of hepatocellular carcinoma. After dosing, subjects had reduced levels of pro-inflammatory cytokines, and we therefore hypothesized that MTL-CEBPA has anti-inflammatory potential. The current study was conducted to determine the effects of C/EBPα saRNA - CEBPA-51 - on inflammation in vitro and in vivo after endotoxin challenge. CEBPA-51 led to increased expression of the C/EBPα gene and inhibition of pro-inflammatory cytokines in THP-1 monocytes previously stimulated by E. coli-derived lipopolysaccharide (LPS). Treatment with MTL-CEBPA in an LPS-challenged humanized mouse model upregulated C/EBPα mRNA, increased neutrophils, and attenuated production of several key pro-inflammatory cytokines, including TNF-α, IL-6, IL-1β, and IFN-γ. In addition, a Luminex analysis of mouse serum revealed that MTL-CEBPA reduced pro-inflammatory cytokines and increased the anti-inflammatory cytokine IL-10. Collectively, the data support further investigation of MTL-CEBPA in acute and chronic inflammatory diseases where this mechanism has pathogenic importance.
Collapse
Affiliation(s)
- Jiehua Zhou
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Haitang Li
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Xin Xia
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Alberto Herrera
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Nicolette Pollock
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Vikash Reebye
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Mikael H Sodergren
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Stephanie Dorman
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Bruce H Littman
- Translational Medicine Associates, LLC, Savannah, GA 31302, USA
| | | | - Kai-Wen Huang
- Department of Surgery and Hepatitis Research Center, National Taiwan University Hospital, College of Medicine, Taipei 10617, Taiwan
| | | | | | - Nagy A Habib
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK; MiNA Therapeutics, Ltd., London W12 0BZ, UK.
| | - John J Rossi
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA.
| |
Collapse
|
8
|
de Cossío LF, Fourrier C, Sauvant J, Everard A, Capuron L, Cani PD, Layé S, Castanon N. Impact of prebiotics on metabolic and behavioral alterations in a mouse model of metabolic syndrome. Brain Behav Immun 2017; 64:33-49. [PMID: 28027925 DOI: 10.1016/j.bbi.2016.12.022] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 12/09/2016] [Accepted: 12/22/2016] [Indexed: 02/08/2023] Open
Abstract
Mounting evidence shows that the gut microbiota, an important player within the gut-brain communication axis, can affect metabolism, inflammation, brain function and behavior. Interestingly, gut microbiota composition is known to be altered in patients with metabolic syndrome (MetS), who also often display neuropsychiatric symptoms. The use of prebiotics, which beneficially alters the microbiota, may therefore be a promising way to potentially improve physical and mental health in MetS patients. This hypothesis was tested in a mouse model of MetS, namely the obese and type-2 diabetic db/db mice, which display emotional and cognitive alterations associated with changes in gut microbiota composition and hippocampal inflammation compared to their lean db/+ littermates. We assessed the impact of chronic administration (8weeks) of prebiotics (oligofructose) on both metabolic (body weight, food intake, glucose homeostasis) and behavioral (increased anxiety-like behavior and impaired spatial memory) alterations characterizing db/db mice, as well as related neurobiological correlates, with particular attention to neuroinflammatory processes. Prebiotic administration improved excessive food intake and glycemic dysregulations (glucose tolerance and insulin resistance) in db/db mice. This was accompanied by an increase of plasma anti-inflammatory cytokine IL-10 levels and hypothalamic mRNA expression of the anorexigenic cytokine IL-1β, whereas unbalanced mRNA expression of hypothalamic orexigenic (NPY) and anorexigenic (CART, POMC) peptides was unchanged. We also detected signs of improved blood-brain-barrier integrity in the hypothalamus of oligofructose-treated db/db mice (normalized expression of tight junction proteins ZO-1 and occludin). On the contrary, prebiotic administration did not improve behavioral alterations and associated reduction of hippocampal neurogenesis displayed by db/db mice, despite normalization of increased hippocampal IL-6 mRNA expression. Of note, we found a relationship between the effect of treatment on dentate gyrus neurons and spatial memory. These findings may prove valuable for introducing novel approaches to treat some of the comorbidities associated with MetS.
Collapse
Affiliation(s)
- Lourdes Fernández de Cossío
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Célia Fourrier
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Julie Sauvant
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Amandine Everard
- Université catholique de Louvain, Louvain Drug Research Institute, WELBIO (Walloon Excellence in Life Sciences and Biotechnology), Metabolism and Nutrition Research Group, 1200 Brussels, Belgium
| | - Lucile Capuron
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Patrice D Cani
- Université catholique de Louvain, Louvain Drug Research Institute, WELBIO (Walloon Excellence in Life Sciences and Biotechnology), Metabolism and Nutrition Research Group, 1200 Brussels, Belgium
| | - Sophie Layé
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France
| | - Nathalie Castanon
- INRA, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France; Université de Bordeaux, Nutrition and Integrative Neurobiology, UMR 1286, 33076 Bordeaux, France.
| |
Collapse
|
9
|
Crowell KT, Soybel DI, Lang CH. Inability to replete white adipose tissue during recovery phase of sepsis is associated with increased autophagy, apoptosis, and proteasome activity. Am J Physiol Regul Integr Comp Physiol 2017; 312:R388-R399. [PMID: 28100477 DOI: 10.1152/ajpregu.00498.2016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/30/2016] [Accepted: 01/13/2017] [Indexed: 12/20/2022]
Abstract
Adipose tissue is an important energy depot and endocrine organ, and the degree of adiposity impacts the host response to infection. However, little is known regarding the mechanisms by which white adipose tissue (WAT) is lost acutely and then restored after the resolution of sepsis. Therefore, the signaling pathways governing protein synthesis, autophagy, apoptosis, and the ubiquitin-proteasome were investigated to identify potential mechanisms mediating the acute (24 h) loss of WAT after cecal ligation and puncture as well as the failure to replenish WAT during recovery (day 10). While whole body fat mass was decreased equally in pair-fed control and septic mice at 5 days after cecal ligation and puncture, fat mass remained 35% lower in septic mice at day 10 During sepsis-recovery, protein synthesis in epididymal WAT was increased compared with control values, and this increase was associated with an elevation in eukaryotic translation initiation factor (eIF)2Bε but no change in mammalian target of rapamycin complex 1 activity (eIF4E-binding protein-1 or S6 kinase 1 phosphorylation). Protein breakdown was increased during sepsis-recovery, as evidenced by the elevation in ubiquitin-proteasome activity. Moreover, indexes of autophagy (light chain 3B-II, autophagy-related protein 5/12, and beclin) were increased during sepsis-recovery and associated with increased AMP-activated kinase-dependent Ser555-phosphorylated Unc-51-like autophagy activating kinase-1. Apoptosis was increased, as suggested by the increased cleavage of caspase-3 and poly(ADP-ribose) polymerase. These changes were associated with increased inflammasome activity (increased NLR family, pyrin domain containing 3; TMS1; and caspase-1 cleavage) and the endoplasmic reticulum stress response (increased eIF2α and activating transcription factor-4) and browning (uncoupling protein-1) in epididymal WAT. Our data suggest that WAT stores remain depleted during recovery from sepsis due to sustained inflammation and elevations in protein and cellular degradation, despite the increase in protein synthesis.
Collapse
Affiliation(s)
- Kristen T Crowell
- Department of Surgery, Penn State College of Medicine, Hershey, Pennsylvania
| | - David I Soybel
- Department of Surgery, Penn State College of Medicine, Hershey, Pennsylvania.,Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania; and.,Department of Nutritional Sciences, Penn State University, University Park, Pennsylvania
| | - Charles H Lang
- Department of Surgery, Penn State College of Medicine, Hershey, Pennsylvania .,Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania; and
| |
Collapse
|
10
|
Hamada J, Onuma H, Ochi F, Hirai H, Takemoto K, Miyoshi A, Matsushita M, Kadota Y, Ohashi J, Kawamura R, Takata Y, Nishida W, Hashida S, Ishii E, Osawa H. Endoplasmic reticulum stress induced by tunicamycin increases resistin messenger ribonucleic acid through the pancreatic endoplasmic reticulum eukaryotic initiation factor 2α kinase-activating transcription factor 4-CAAT/enhancer binding protein-α homologous protein pathway in THP-1 human monocytes. J Diabetes Investig 2015; 7:312-23. [PMID: 27330716 PMCID: PMC4847884 DOI: 10.1111/jdi.12434] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 09/09/2015] [Accepted: 09/23/2015] [Indexed: 01/06/2023] Open
Abstract
AIMS/INTRODUCTION Resistin, secreted from adipocytes, causes insulin resistance in mice. In humans, the resistin gene is mainly expressed in monocytes and macrophages. Tunicamycin is known to induce endoplasmic reticulum (ER) stress, and reduce resistin gene expression in 3T3-L1 mouse adipocytes. The aim of the present study was to examine whether ER stress affects resistin gene expression in human monocytes. MATERIALS AND METHODS The relationship between resistin messenger ribonucleic acid (mRNA) and ER stress markers mRNA was analyzed by reverse transcription polymerase chain reaction in isolated monocytes of 30 healthy volunteers. The effect of endotoxin/lipopolysaccharides or tunicamycin on resistin gene expression was analyzed in THP-1 human monocytes. Signaling pathways leading to resistin mRNA were assessed by the knockdown using small interfering RNA or overexpression of key molecules involved in unfolded protein response. RESULTS Resistin mRNA was positively associated with immunoglobulin heavy chain-binding protein (BiP) or CAAT/enhancer binding protein-α homologous protein (CHOP) mRNA in human isolated monocytes. In THP-1 cells, lipopolysaccharides increased mRNA of BiP, pancreatic endoplasmic reticulum eukaryotic initiation factor 2α kinase (PERK) and CHOP, as well as resistin. Tunicamycin also increased resistin mRNA. This induction appeared to be dose- and time-dependent. Tunicamycin-induced resistin mRNA was inhibited by chemical chaperone, 4-phenylbutyric acid. The knockdown of either PERK, activating transcription factor 4 (ATF4) or CHOP reduced tunicamycin-induced resistin mRNA. Conversely, overexpression of ATF4 or CHOP increased resistin mRNA. CONCLUSIONS Endoplasmic reticulum stress induced by tunicamycin increased resistin mRNA through the PERK-ATF4-CHOP pathway in THP-1 human monocytes. ER stress could lead to insulin resistance through enhanced resistin gene expression in human monocytes.
Collapse
Affiliation(s)
- Junpei Hamada
- Department of Pediatrics Ehime University Graduate School of Medicine Ehime Japan
| | - Hiroshi Onuma
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Fumihiro Ochi
- Department of Pediatrics Ehime University Graduate School of Medicine Ehime Japan
| | - Hiroki Hirai
- Department of Pediatrics Ehime University Graduate School of Medicine Ehime Japan
| | - Koji Takemoto
- Department of Pediatrics Ehime University Graduate School of Medicine Ehime Japan
| | - Akiko Miyoshi
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Manami Matsushita
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Yuko Kadota
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Jun Ohashi
- Department of Biological Sciences Tokyo University Graduate School of Science Tokyo Japan
| | - Ryoichi Kawamura
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Yasunori Takata
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Wataru Nishida
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| | - Seiichi Hashida
- Institute for Health Sciences Tokushima Bunri University Tokushima Japan
| | - Eiichi Ishii
- Department of Pediatrics Ehime University Graduate School of Medicine Ehime Japan
| | - Haruhiko Osawa
- Department of Diabetes and Molecular Genetics Ehime University Graduate School of Medicine Ehime Japan
| |
Collapse
|