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Jiang Y, Southam AD, Trova S, Beke F, Alhazmi B, Francis T, Radotra A, di Maio A, Drayson MT, Bunce CM, Khanim FL. Valproic acid disables the Nrf2 anti-oxidant response in acute myeloid leukaemia cells enhancing reactive oxygen species-mediated killing. Br J Cancer 2022; 126:275-286. [PMID: 34686779 PMCID: PMC8770569 DOI: 10.1038/s41416-021-01570-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/27/2021] [Accepted: 09/28/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND We previously demonstrated the in vitro killing of AML cells by the combination of the lipid-lowering agent bezafibrate (BEZ) and the contraceptive hormone medroxyprogesterone acetate (MPA). A phase II trial demonstrated in vivo safety and efficacy of BEZ and MPA (BaP) in elderly, relapsed/refractory AML and high-risk myelodysplastic syndrome (MDS) patients. However, we observed dose-limiting toxicities in a second trial that attempted to improve outcomes via escalation of BaP doses. Thus we sought to identify a third repurposed drug that potentiates activity of low dose BaP (BaP 0.1 mM). METHODS AND RESULTS We demonstrate that addition of a commonly used anti-epileptic, valproic acid (VAL) to low dose BaP (BaP 0.1 mM)(VBaP) enhanced killing of AML cell lines/primary AML cells to levels similar to high dose BaP (BaP 0.5 mM). Similarly, addition of VAL to BaP 0.1 mM enhanced reactive oxygen species (ROS), lipid peroxidation and inhibition of de novo fatty acid synthesis. Overexpression of Nrf2 in K562 and KG1a completely inhibited ROS production and rescued cells from VAL/BaP 0.1 mM/VBaP killing. CONCLUSIONS Given the good safety data of low-dose BaP in elderly/relapsed/refractory AML patients, and that VAL alone is well-tolerated, we propose VBaP as a novel therapeutic combination for AML.
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Affiliation(s)
- Yao Jiang
- grid.6572.60000 0004 1936 7486School of Biomedical Sciences, Institute of Clinical Sciences, University of Birmingham, Birmingham, UK
| | - Andrew D. Southam
- grid.6572.60000 0004 1936 7486School of Biosciences, University of Birmingham, Birmingham, UK
| | - Sandro Trova
- grid.6572.60000 0004 1936 7486School of Biosciences, University of Birmingham, Birmingham, UK
| | - Flavio Beke
- grid.5335.00000000121885934CRUK Cancer Institute, University of Cambridge, Cambridge, UK
| | - Bader Alhazmi
- grid.6572.60000 0004 1936 7486School of Biomedical Sciences, Institute of Clinical Sciences, University of Birmingham, Birmingham, UK
| | - Thomas Francis
- grid.13097.3c0000 0001 2322 6764Centre for Human & Applied Physiological Sciences, School of Basic & Medical Biosciences, King’s College London, London, UK
| | - Anshul Radotra
- grid.412570.50000 0004 0400 5079University Hospitals Coventry and Warwickshire, Clifford Bridge Rd, Coventry, UK
| | - Alessandro di Maio
- grid.6572.60000 0004 1936 7486School of Biosciences, University of Birmingham, Birmingham, UK
| | - Mark T. Drayson
- grid.6572.60000 0004 1936 7486Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - Chris M. Bunce
- grid.6572.60000 0004 1936 7486School of Biosciences, University of Birmingham, Birmingham, UK
| | - Farhat L. Khanim
- grid.6572.60000 0004 1936 7486School of Biomedical Sciences, Institute of Clinical Sciences, University of Birmingham, Birmingham, UK
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Björk C, Subramanian N, Liu J, Acosta JR, Tavira B, Eriksson AB, Arner P, Laurencikiene J. An RNAi Screening of Clinically Relevant Transcription Factors Regulating Human Adipogenesis and Adipocyte Metabolism. Endocrinology 2021; 162:6272286. [PMID: 33963396 PMCID: PMC8197287 DOI: 10.1210/endocr/bqab096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Indexed: 12/13/2022]
Abstract
CONTEXT Healthy hyperplasic (many but smaller fat cells) white adipose tissue (WAT) expansion is mediated by recruitment, proliferation and/or differentiation of new fat cells. This process (adipogenesis) is controlled by transcriptional programs that have been mostly identified in rodents. OBJECTIVE A systemic investigation of adipogenic human transcription factors (TFs) that are relevant for metabolic conditions has not been revealed previously. METHODS TFs regulated in WAT by obesity, adipose morphology, cancer cachexia, and insulin resistance were selected from microarrays. Their role in differentiation of human adipose tissue-derived stem cells (hASC) was investigated by RNA interference (RNAi) screen. Lipid accumulation, cell number, and lipolysis were measured for all screened factors (148 TFs). RNA (RNAseq), protein (Western blot) expression, insulin, and catecholamine responsiveness were examined in hASC following siRNA treatment of selected target TFs. RESULTS Analysis of TFs regulated by metabolic conditions in human WAT revealed that many of them belong to adipogenesis-regulating pathways. The RNAi screen identified 39 genes that affected fat cell differentiation in vitro, where 11 genes were novel. Of the latter JARID2 stood out as being necessary for formation of healthy fat cell metabolic phenotype by regulating expression of multiple fat cell phenotype-specific genes. CONCLUSION This comprehensive RNAi screening in hASC suggests that a large proportion of WAT TFs that are impacted by metabolic conditions might be important for hyperplastic adipose tissue expansion. The screen also identified JARID2 as a novel TF essential for the development of functional adipocytes.
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Affiliation(s)
- Christel Björk
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
| | - Narmadha Subramanian
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
| | - Jianping Liu
- Karolinska High Throughput Center, Department of Medical Biochemistry and Biophysics (MBB), Division of Functional Genomics, Karolinska Institutet, Stockholm SE-171 77, Sweden
| | - Juan Ramon Acosta
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
| | - Beatriz Tavira
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
| | - Anders B Eriksson
- Karolinska High Throughput Center, Department of Medical Biochemistry and Biophysics (MBB), Division of Functional Genomics, Karolinska Institutet, Stockholm SE-171 77, Sweden
| | - Peter Arner
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
| | - Jurga Laurencikiene
- Lipid laboratory, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, SE-14186, Sweden
- Correspondence: Jurga Laurencikiene, PhD, Karolinska Institutet, Lipid laboratory, Dept. of Medicine Huddinge (MedH), NEO, Hälsovägen 9/Blickagången 16, 14183 Huddinge, Sweden.
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Pang B, Zhang J, Zhang X, Yuan J, Shi Y, Qiao L. Inhibition of lipogenesis and induction of apoptosis by valproic acid in prostate cancer cells via the C/EBPα/SREBP-1 pathway. Acta Biochim Biophys Sin (Shanghai) 2021; 53:354-364. [PMID: 33471067 DOI: 10.1093/abbs/gmab002] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Indexed: 12/13/2022] Open
Abstract
Lipid metabolism reprogramming is now accepted as a new hallmark of cancer. Hence, targeting the lipogenesis pathway may be a potential avenue for cancer treatment. Valproic acid (VPA) emerges as a promising drug for cancer therapy; however, the underlying mechanisms are not yet fully understood. In this study, we aimed to investigate the effects and mechanisms of VPA on cell viability, lipogenesis, and apoptosis in human prostate cancer PC-3 and LNCaP cells. The results showed that VPA significantly reduced lipid accumulation and induced apoptosis of PC-3 and LNCaP cells. Moreover, the expression of CCAAT/enhancer-binding protein α (C/EBPα), as well as sterol regulatory element-binding protein 1 (SREBP-1) and its downstream effectors, including fatty acid synthase (FASN), acetyl CoA carboxylase 1 (ACC1), and anti-apoptotic B-cell lymphoma 2 (Bcl-2), was markedly decreased in PC-3 and LNCaP cells after VPA administration. Mechanistically, the overexpression of C/EBPα rescued the levels of SREBP-1, FASN, ACC1, and Bcl-2, enhanced lipid accumulation, and attenuated apoptosis of VPA-treated PC-3 cells. Conversely, knockdown of C/EBPα by siRNA further decreased lipid accumulation, enhanced apoptosis, and reduced the levels of SREBP-1, FASN, ACC1, and Bcl-2. In addition, SREBP-1a and 1c enhanced the expressions of FASN and ACC1, but only SREBP-1a had a significant effect on Bcl-2 expression in VPA-treated PC-3 cells. Based on the results, we concluded that VPA significantly inhibits cell viability via decreasing lipogenesis and inducing apoptosis via the C/EBPα/SREBP-1 pathway in prostate cancer cells. Therefore, VPA that targets lipid metabolism and apoptosis is a promising candidate for PCa chemotherapy.
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Affiliation(s)
- Bo Pang
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin 300134, China
| | - Juanjuan Zhang
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin 300134, China
| | - Xi Zhang
- School of Ophthalmology & Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou 325035, China
| | - Jihong Yuan
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin 300134, China
| | - Yanan Shi
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin 300134, China
| | - Ling Qiao
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin 300134, China
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Maeda T, Wakisaka S. Deficiency of C1q/TNF-related protein 3 (CTRP3) decreases adipose tissue weight in diet-induced obesity mice. Mol Biol Rep 2020; 47:9219-9224. [PMID: 33057992 DOI: 10.1007/s11033-020-05905-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 10/07/2020] [Indexed: 11/30/2022]
Abstract
Adipokines are important regulators of lipid and glucose metabolism. A family of adiponectin paralogs is known as C1q and tumor necrosis factor (TNF)-related proteins (CTRPs). One line of Ctrp3-deficient mice shows reduced liver size in response to obesity. We generated and characterized another line of Ctrp3 knockout (KO) mice to reveal novel physiological functions of CTRP3. Interestingly, high fat diet (HFD)-fed Ctrp3 KO mice displayed a decrease in the epididymal white adipose tissue (WAT) weight to total body weight ratio. Histologically, adipocyte size was significantly smaller in the epididymal WAT of HFD-fed Ctrp3 KO mice than wild-type (WT) controls. The expression of several genes involved in lipogenesis, lipolysis and adipogenesis in the epididymal WAT of Ctrp3 KO mice fed a HFD was decreased. The present findings provide new insight into the role of CTRP3 as adipokine in the regulation of adipose tissue in obesity.
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Affiliation(s)
- Takashi Maeda
- Department of Anatomy and Cell Biology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Satoshi Wakisaka
- Department of Anatomy and Cell Biology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
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Promotion of lipogenesis by PPARγ-activated FXR expression in adipocytes. Biochem Biophys Res Commun 2020; 527:49-55. [DOI: 10.1016/j.bbrc.2020.04.075] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 04/15/2020] [Indexed: 12/11/2022]
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Watanabe K, Yokota K, Yoshida K, Matsumoto A, Iwamoto S. Kbtbd11 contributes to adipocyte homeostasis through the activation of upstream stimulatory factor 1. Heliyon 2019; 5:e02777. [PMID: 31844712 PMCID: PMC6895693 DOI: 10.1016/j.heliyon.2019.e02777] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 09/17/2019] [Accepted: 10/29/2019] [Indexed: 12/27/2022] Open
Abstract
The present study aimed to investigate the transcriptional regulation of Kbtbd11 in adipose tissue. To elucidate the physiological role of Kbtbd11 gene expression, adipose Kbtbd11 mRNA expression levels were estimated under various feeding states in wild-type mice. Kbtbd11 expression increased in a time-dependent manner in the adipose tissue in mice fed on chow diet, whereas the promotion of Kbtbd11 mRNA expression by refeeding was attenuated in mice fed on high-fat (HF) diet, suggesting the suppression of Kbtbd11 mRNA expression under HF diets and that changes in mRNA levels were associated with regulation of the transcription activity of Kbtbd11 by some transcription factors. To investigate the transcriptional regulation of Kbtbd11, the fragment upstream of either mouse Kbtbd11 or human KBTBD11 promoter was inserted into a luciferase vector. Luciferase reporter assays revealed that both mouse and human KBTBD11 promoter activity was increased by USF1. Direct USF1 binding to the Ebox in the Kbtbd11 promoter was confirmed by electrophoretic mobility shift and chromatin immunoprecipitation assays. In addition, the adipocyte differentiation marker levels increased instantly in Kbtbd11-overexpressing Usf1 knockdown cells than in Usf1 knockdown cells. These results imply an association of between Kbtbd11 with Usf1 expression and suggest the involvement of Kbtbd11 in a novel adipogenesis pathway.
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Yang Y, Liu F, Lu R, Jia J. Berberine Inhibits Adipogenesis in Porcine Adipocytes
via
AMP‐Activated Protein Kinase‐Dependent and ‐Independent Mechanisms. Lipids 2019; 54:667-678. [DOI: 10.1002/lipd.12200] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 09/20/2019] [Accepted: 10/08/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Yongqing Yang
- College of Life ScienceShanxi Normal University The First Gongyuan Road, Linfen Shanxi Province 041000 People's Republic of China
| | - Fenglan Liu
- College of Life ScienceShanxi Normal University The First Gongyuan Road, Linfen Shanxi Province 041000 People's Republic of China
| | - Rongsheng Lu
- College of Life ScienceShanxi Normal University The First Gongyuan Road, Linfen Shanxi Province 041000 People's Republic of China
| | - Junli Jia
- College of Life ScienceShanxi Normal University The First Gongyuan Road, Linfen Shanxi Province 041000 People's Republic of China
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L-PGDS-produced PGD 2 in premature, but not in mature, adipocytes increases obesity and insulin resistance. Sci Rep 2019; 9:1931. [PMID: 30760783 PMCID: PMC6374461 DOI: 10.1038/s41598-018-38453-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 12/28/2018] [Indexed: 12/12/2022] Open
Abstract
Lipocalin-type prostaglandin (PG) D synthase (L-PGDS) is responsible for the production of PGD2 in adipocytes and is selectively induced by a high-fat diet (HFD) in adipose tissue. In this study, we investigated the effects of HFD on obesity and insulin resistance in two distinct types of adipose-specific L-PGDS gene knockout (KO) mice: fatty acid binding protein 4 (fabp4, aP2)-Cre/L-PGDSflox/flox and adiponectin (AdipoQ)-Cre/L-PGDSflox/flox mice. The L-PGDS gene was deleted in adipocytes in the premature stage of the former strain and after maturation of the latter strain. The L-PGDS expression and PGD2 production levels decreased in white adipose tissue (WAT) under HFD conditions only in the aP2-Cre/L-PGDSflox/flox mice, but were unchanged in the AdipoQ-Cre/L-PGDSflox/flox mice. When fed an HFD, aP2-Cre/L-PGDSflox/flox mice significantly reduced body weight gain, adipocyte size, and serum cholesterol and triglyceride levels. In WAT of the HFD-fed aP2-Cre/L-PGDSflox/flox mice, the expression levels of the adipogenic, lipogenic, and M1 macrophage marker genes were decreased, whereas those of the lipolytic and M2 macrophage marker genes were enhanced or unchanged. Insulin sensitivity was improved in the HFD-fed aP2-Cre/L-PGDSflox/flox mice. These results indicate that PGD2 produced by L-PGDS in premature adipocytes is involved in the regulation of body weight gain and insulin resistance under nutrient-dense conditions.
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Wang D, Zheng J, Liu X, Xue Y, Liu L, Ma J, He Q, Li Z, Cai H, Liu Y. Knockdown of USF1 Inhibits the Vasculogenic Mimicry of Glioma Cells via Stimulating SNHG16/miR-212-3p and linc00667/miR-429 Axis. MOLECULAR THERAPY-NUCLEIC ACIDS 2019; 14:465-482. [PMID: 30743215 PMCID: PMC6369224 DOI: 10.1016/j.omtn.2018.12.017] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 11/19/2018] [Accepted: 12/03/2018] [Indexed: 12/16/2022]
Abstract
The anti-angiogenic treatment of malignant glioma cells is an effective method to treat high-grade gliomas. However, due to the presence of vasculogenic mimicry (VM), the anti-angiogenic treatment of gliomas is not significantly effective in improving overall patient median survival. Therefore, this study investigated the mechanism of mimic formation of angiogenesis in gliomas. The results of this experiment indicate that the expression of upstream transcription factor 1 (USF1) is upregulated in glioma tissues and cells. USF1 knockdown inhibits the proliferation, migration, invasion, VM, and expression of VM-associated proteins in glioma cells by stimulating SNHG16 and linc00667. These two long non-coding RNAs (lncRNAs) regulate ALHD1A1 through the competing endogenous RNA (ceRNA) mechanism influencing the VM of glioma. This study is the first to demonstrate that the USF1/SNHG16/miR-212-3p/ALDH1A1 (aldehyde dehydrogenase-1) and USF1/linc00667/miR-429/ALDH1A1 axis regulates the VM of glioma cells, and these findings might provide a novel strategy for glioma treatment.
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Affiliation(s)
- Di Wang
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China
| | - Jian Zheng
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China
| | - Xiaobai Liu
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China
| | - Yixue Xue
- Department of Neurobiology, College of Basic Medicine, China Medical University, Shenyang 110122, China; Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang 110122, China; Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang 110122, China
| | - Libo Liu
- Department of Neurobiology, College of Basic Medicine, China Medical University, Shenyang 110122, China; Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang 110122, China; Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang 110122, China
| | - Jun Ma
- Department of Neurobiology, College of Basic Medicine, China Medical University, Shenyang 110122, China; Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang 110122, China; Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang 110122, China
| | - Qianru He
- Department of Neurobiology, College of Basic Medicine, China Medical University, Shenyang 110122, China; Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang 110122, China; Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang 110122, China
| | - Zhen Li
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China
| | - Heng Cai
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China
| | - Yunhui Liu
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang 110004, China; Liaoning Clinical Medical Research Center in Nervous System Disease, Shenyang 110004, China; Key Laboratory of Neuro-oncology in Liaoning Province, Shenyang 110004, China.
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Prostaglandin D 2 enhances lipid accumulation through suppression of lipolysis via DP2 (CRTH2) receptors in adipocytes. Biochem Biophys Res Commun 2017. [PMID: 28623133 DOI: 10.1016/j.bbrc.2017.06.053] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Prostaglandin (PG) D2 enhanced lipid accumulation in adipocytes. However, its molecular mechanism remains unclear. In this study, we investigated the regulatory mechanisms of PGD2-elevated lipid accumulation in mouse adipocytic 3T3-L1 cells. The Gi-coupled DP2 (CRTH2) receptors (DP2R), one of the two-types of PGD2 receptors were dominantly expressed in adipocytes. A DP2R antagonist, CAY10595, but not DP1 receptor antagonist, BWA868C cleared the PGD2-elevated intracellular triglyceride level. While, a DP2R agonist, 15R-15-methyl PGD2 (15R) increased the mRNA levels of the adipogenic and lipogenic genes, and decreased the glycerol release level. In addition, the forskolin-mediated increase of cAMP-dependent protein kinase A (PKA) activity and phosphorylation of hormone-sensitive lipase (HSL) was repressed by the co-treatment with 15R. Moreover, the lipolysis was enhanced in the adipocyte-differentiated DP2R gene-knockout mouse embryonic fibroblasts. These results indicate that PGD2 suppressed the lipolysis by repression of the cAMP-PKA-HSL axis through DP2R in adipocytes.
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Baba S, Ueno Y, Kikuchi T, Tanaka R, Fujimori K. A Limonoid Kihadanin B from Immature Citrus unshiu Peels Suppresses Adipogenesis through Repression of the Akt-FOXO1-PPARγ Axis in Adipocytes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:9607-9615. [PMID: 27977180 DOI: 10.1021/acs.jafc.6b04521] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Citrus limonoids are secondary metabolites and exhibit a variety of biological activities. In this study, we elucidated the suppression of adipogenesis by a Citrus limonoid kihadanin B and determined its molecular mechanism in mouse 3T3-L1 adipocytes. Kihadanin B was purified from the peels of immature Citrus unshiu by HPLC, and its chemical structure was determined by NMR and mass spectrometry. Kihadanin B reduced the lipid accumulation with the reduction of the expression levels of the adipogenic and lipogenic genes, but did not affect lipolysis in adipocytes. Phosphorylation levels of Akt and a forkhead transcriptional factor, FOXO1, a repressor of PPARγ, were lowered by kihadanin B. Furthermore, kihadanin B increased the binding level of FOXO1 to the PPARγ gene promoter in adipocytes. These results indicate that a Citrus limonoid kihadanin B repressed the adipogenesis by decreasing lipid accumulation through the suppression of the Akt-FOXO1-PPARγ axis in 3T3-L1 adipocytes.
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Affiliation(s)
- Shizuka Baba
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences , 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Yasuaki Ueno
- Laboratory of Medicinal Chemistry, Osaka University of Pharmaceutical Sciences , 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Takashi Kikuchi
- Laboratory of Medicinal Chemistry, Osaka University of Pharmaceutical Sciences , 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Reiko Tanaka
- Laboratory of Medicinal Chemistry, Osaka University of Pharmaceutical Sciences , 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Ko Fujimori
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences , 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
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Nakao Y, Yoshihara H, Fujimori K. Suppression of Very Early Stage Of Adipogenesis by Baicalein, a Plant-Derived Flavonoid through Reduced Akt-C/EBPα-GLUT4 Signaling-Mediated Glucose Uptake in 3T3-L1 Adipocytes. PLoS One 2016; 11:e0163640. [PMID: 27669565 PMCID: PMC5036867 DOI: 10.1371/journal.pone.0163640] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 09/12/2016] [Indexed: 01/06/2023] Open
Abstract
Baicalein has been used as a Chinese medicine, and is an abundant plant flavonoid present in fruits and vegetables. Here, we examined the effects of baicalein in adipogenesis and investigated its molecular mechanism in adipocytes. Baicalein lowered the intracellular lipid accumulation and decreased the transcription levels of the adipocyte-specific genes in mouse 3T3-L1 adipocytes. Glucose uptake mediated by glucose transporter 4 (GLUT4) was reduced, causing down-regulation of the intracellular lipid accumulation. These reductions were also observed even when baicalein was added in only early stage of adipogenesis (0-2 days) of 6-day-adipogenesis. Chromatin immunoprecipitation assay showed that baicalein decreased the binding level of C/EBPα protein to the promoter region of the GLUT4 gene. Phosphorylation of Akt at 1 h after the initiation of adipogenesis was inhibited by the treatment with baicalein. Inhibition during only the first 1.5 h after the initiation of adipogenesis by baicalein or an Akt inhibitor was enough to decrease the lipid contents in the cells undergoing adipocyte differentiation for 6 days. These results indicate that baicalein decreased the intracellular lipid accumulation by down-regulation of glucose uptake via repression of Akt-C/EBPα-GLUT4 signaling in the very early stage of adipogenesis of 3T3-L1 adipocytes.
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Affiliation(s)
- Yukari Nakao
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka, 569–1094, Japan
| | - Hideto Yoshihara
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka, 569–1094, Japan
| | - Ko Fujimori
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka, 569–1094, Japan
- * E-mail:
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Gambo Y, Matsumura M, Fujimori K. Triiodothyronine enhances accumulation of intracellular lipids in adipocytes through thyroid hormone receptor α via direct and indirect mechanisms. Mol Cell Endocrinol 2016; 431:1-11. [PMID: 27132806 DOI: 10.1016/j.mce.2016.04.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 04/25/2016] [Accepted: 04/27/2016] [Indexed: 01/16/2023]
Abstract
Triiodothyronine (T3) enhanced the expression of adipogenic and lipogenic genes with elevation of the intracellular lipids through thyroid hormone receptor (TR) α in mouse 3T3-L1 cells. However, the transcription of the SREBP-1c and HSL genes was decreased by T3. Such T3-mediated alterations were negated by TRα siRNA. Chromatin immunoprecipitation assay showed that the binding of TRα to the TR-responsive element (TRE) of the FAS promoter was elevated by T3. In contrast, the ability of TRα to bind to the TRE of the SREBP-1c promoter was decreased by T3. In addition, the binding of SREBP-1c to the SRE of the HSL promoter was lowered by T3. These results indicate that T3 increased the accumulation of intracellular lipids by enhancing the expression of the FAS gene through direct binding of TRα to the FAS promoter and simultaneously lowered the amount of lipolysis via reduced binding of T3-decreased SREBP-1c to the HSL promoter.
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Affiliation(s)
- Yurina Gambo
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Miki Matsumura
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan
| | - Ko Fujimori
- Laboratory of Biodefense and Regulation, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
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Xue J, Ideraabdullah FY. An assessment of molecular pathways of obesity susceptible to nutrient, toxicant and genetically induced epigenetic perturbation. J Nutr Biochem 2015; 30:1-13. [PMID: 27012616 DOI: 10.1016/j.jnutbio.2015.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 08/20/2015] [Accepted: 09/09/2015] [Indexed: 12/12/2022]
Abstract
In recent years, the etiology of human disease has greatly improved with the inclusion of epigenetic mechanisms, in particular as a common link between environment and disease. However, for most diseases we lack a detailed interpretation of the epigenetic regulatory pathways perturbed by environment and causal mechanisms. Here, we focus on recent findings elucidating nutrient-related epigenetic changes linked to obesity. We highlight studies demonstrating that obesity is a complex disease linked to disruption of epigenetically regulated metabolic pathways in the brain, adipose tissue and liver. These pathways regulate (1) homeostatic and hedonic eating behaviors, (2) adipocyte differentiation and fat accumulation, and (3) energy expenditure. By compiling these data, we illustrate that obesity-related phenotypes are repeatedly linked to disruption of critical epigenetic mechanisms that regulate key metabolic genes. These data are supported by genetic mutation of key epigenetic regulators, and many of the diet-induced epigenetic mechanisms of obesity are also perturbed by exposure to environmental toxicants. Identifying similarly perturbed epigenetic mechanisms in multiple experimental models of obesity strengthens the translational applications of these findings. We also discuss many of the ongoing challenges to understanding the role of environmentally induced epigenetic pathways in obesity and suggest future studies to elucidate these roles. This assessment illustrates our current understanding of molecular pathways of obesity that are susceptible to environmental perturbation via epigenetic mechanisms. Thus, it lays the groundwork for dissecting the complex interactions between diet, genes and toxicants that contribute to obesity and obesity-related phenotypes.
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Affiliation(s)
- Jing Xue
- Nutrition Research Institute, University of North Carolina at Chapel Hill, 500 Laureate Way, Kannapolis, NC 28081, USA
| | - Folami Y Ideraabdullah
- Nutrition Research Institute, University of North Carolina at Chapel Hill, 500 Laureate Way, Kannapolis, NC 28081, USA; Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, 120 Mason Farm Rd, Chapel Hill, NC 27599, United States; Department of Nutrition, 120 Mason Farm Rd, Chapel Hill, NC 27599, United States.
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