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Zhang S, Li J, Zhai Y, Xu J, Wang Y, Ding X, Qiu X. Serum untargeted metabolomics analysis of the preventive mechanism of TAETEA Prebiotea on non-alcoholic fatty liver in rats. J Pharm Biomed Anal 2024; 247:116218. [PMID: 38810332 DOI: 10.1016/j.jpba.2024.116218] [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: 03/12/2024] [Revised: 05/01/2024] [Accepted: 05/11/2024] [Indexed: 05/31/2024]
Abstract
Pu-erh tea belongs to the six tea categories of black tea, according to the processing technology and quality characteristics, is divided into two types of raw tea and ripe tea. Raw tea is made from fresh leaves of tea as raw materials, through the process of greening, kneading, sun drying, steam molding and other processes made of tightly pressed tea. Ripe tea is made from Yunnan large-leafed sun green tea, using a specific process, post-fermentation (rapid post-fermentation or slow post-fermentation) processing of loose tea and tightly pressed tea. TAETEA Prebiotea is Puerh Ripe Tea, TAETEA Prebiotea has the effect of increasing insulin level and improving hyperglycemia in mice, and it also has the effect of regulating blood lipids, which can reduce the level of serum total cholesterol (TC) and triglycerides (TG), increase the level of high-density lipoprotein cholesterol (HDL-C), and improve the metabolism of lipids. Therefore, further experiments were conducted by us, and TAETEA Prebiotea was formulated into a suitable dose for the intervention of non alcoholic fatty liver disease (NAFLD) model rats, and at the end of the experiments, the samples of each group of experiments were analyzed and detected by the method of UHPLC-Q-Exactive LC-MS liquid-mass spectrometry methodology, and the relevant metabolites as well as metabolic pathways were analyzed by the method of Non targeted metabolomics analysis. As a result, 71 differential metabolites could be screened, of which 35 differential metabolites were up-regulated after intervention and 36 differential metabolites were down-regulated after intervention. Based on the KEGG pathway enrichment and Pathway Impact bubble diagram analysis, glycine, serine, threonine metabolism, arginine and proline metabolism, protein digestion and absorption, and central carbon metabolism in cancer may be the main metabolic pathways in which TAETEA Prebiotea exerted preventive effects on NAFLD rats, C00148 (Proline), C00300 (Creatine) and C00719 (Betaine) are the differential metabolites that play important regulatory roles.
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Affiliation(s)
- Shijiao Zhang
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Jiahang Li
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Yingfan Zhai
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Jiachen Xu
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Yixin Wang
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Xiaochen Ding
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China
| | - Xiangjun Qiu
- College of Basic Medicine and Forensic Medicine, Henan University of Science and Technology, Luoyang, Henan 471023, People's Republic of China.
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Choi JW, Park GH, Choi HJ, Lee JW, Kwon HY, Choi MY, Jeong JB. Anti‑obesity and immunostimulatory activity of Chrysosplenium flagelliferum in mouse preadipocytes 3T3‑L1 cells and mouse macrophage RAW264.7 cells. Exp Ther Med 2024; 28:315. [PMID: 38911047 PMCID: PMC11190883 DOI: 10.3892/etm.2024.12604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 05/22/2024] [Indexed: 06/25/2024] Open
Abstract
Chrysosplenium flagelliferum (CF) is known for its anti-inflammatory, antioxidant and antibacterial activities. However, there is a lack of research on its other pharmacological properties. In the present study, the bifunctional roles of CF in 3T3-L1 and RAW264.7 cells were investigated, focusing on its anti-obesity and immunostimulatory effects. In 3T3-L1 cells, CF effectively mitigated the accumulation of lipid droplets and triacylglycerol. Additionally, CF downregulated the peroxisome proliferator-activated receptor (PPAR)-γ and CCAAT/enhancer-binding protein α protein levels; however, this effect was impeded by the knockdown of β-catenin using β-catenin-specific small interfering RNA. Consequently, CF-mediated inhibition of lipid accumulation was also decreased. CF increased the protein levels of adipose triglyceride lipase and phosphorylated hormone-sensitive lipase, while decreasing those of perilipin-1. Moreover, CF elevated the protein levels of phosphorylated AMP-activated protein kinase and PPARγ coactivator 1-α. In RAW264.7 cells, CF enhanced the production of pro-inflammatory mediators, such as nitric oxide (NO), inducible NO synthase, interleukin (IL)-1β, IL-6 and tumor necrosis factor-α, and increased their phagocytic capacities. Inhibition of Toll-like receptor (TLR)-4 significantly reduced the effects of CF on the production of pro-inflammatory mediators and phagocytosis, indicating its crucial role in facilitating these effects. CF-induced increase in the production of pro-inflammatory mediators was controlled by the activation of c-Jun N-terminal kinase (JNK) and nuclear factor (NF)-κB pathways, and TLR4 inhibition attenuated the phosphorylation of these kinases. The results of the pesent study suggested that CF inhibits lipid accumulation by suppressing adipogenesis and inducing lipolysis and thermogenesis in 3T3-L1 cells, while stimulating macrophage activation via the activation of JNK and NF-κB signaling pathways mediated by TLR4 in RAW264.7 cells. Therefore, CF simultaneously exerts both anti-obesity and immunostimulatory effects.
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Affiliation(s)
- Jeong Won Choi
- Department of Forest Science, Andong National University, Andong, Gyeongsangbuk 36729, Republic of Korea
| | - Gwang Hun Park
- Forest Medicinal Resources Research Center, National Institute of Forest Science, Yeongju, Gyeongsangbuk 36040, Republic of Korea
| | - Hyeok Jin Choi
- Department of Forest Science, Andong National University, Andong, Gyeongsangbuk 36729, Republic of Korea
| | - Jae Won Lee
- Department of Forest Science, Andong National University, Andong, Gyeongsangbuk 36729, Republic of Korea
| | - Hae-Yun Kwon
- Forest Medicinal Resources Research Center, National Institute of Forest Science, Yeongju, Gyeongsangbuk 36040, Republic of Korea
| | - Min Yeong Choi
- Forest Medicinal Resources Research Center, National Institute of Forest Science, Yeongju, Gyeongsangbuk 36040, Republic of Korea
| | - Jin Boo Jeong
- Department of Forest Science, Andong National University, Andong, Gyeongsangbuk 36729, Republic of Korea
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Zhao H, Zhao H, Li M, Tang Y, Xiao X, Cai Y, He F, Huang H, Zhang Y, Li J. Twin defect-rich Pt ultrathin nanowire nanozymes alleviate inflammatory skin diseases by scavenging reactive oxygen species. Redox Biol 2024; 70:103055. [PMID: 38290385 PMCID: PMC10844124 DOI: 10.1016/j.redox.2024.103055] [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: 11/26/2023] [Revised: 12/28/2023] [Accepted: 01/22/2024] [Indexed: 02/01/2024] Open
Abstract
Nanozymes with superior antioxidant properties offer new hope for treating oxidative stress-related inflammatory skin diseases. However, lacking sufficient catalytic activity or having complex material designs limit the application of current metallic nanozymes in inflammatory skin diseases. Here, we report a simple and effective twin-defect platinum nanowires (Pt NWs) enzyme with multiple mimetic enzymes and broad-spectrum ROS scavenging capability for the treatment of inflammatory skin diseases in mice (including psoriasis and rosacea). Pt NWs with simultaneous superoxide dismutase, glutathione peroxidase and catalase mimetic enzyme properties exhibit cytoprotective effects against ROS-mediated damage at extremely low doses and significantly improve treatment outcomes in psoriasis- and rosacea-like mice. Meanwhile, these ultrasmall sizes of Pt NWs allow the nanomaterials to effectively penetrate the skin and do not produce significant biotoxicity. Therefore, Pt NWs have potential applications in treating diseases related to oxidative stress or inflammation.
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Affiliation(s)
- He Zhao
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Han Zhao
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Mengfan Li
- College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China
| | - Yan Tang
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Xin Xiao
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yisheng Cai
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Fanping He
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Hongwen Huang
- College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China
| | - Yiya Zhang
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
| | - Ji Li
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory of Aging Biology, Xiangya Hospital, Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
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Ezzati‐Mobaser S, Yarahmadi S, Dadkhah Nikroo N, Maleki MH, Yousefi Z, Golpour P, Nourbakhsh M, Nourbakhsh M. Adipose triglyceride lipase gene expression in peripheral blood mononuclear cells of subjects with obesity and its association with insulin resistance, inflammation and lipid accumulation in liver. Obes Sci Pract 2024; 10:e716. [PMID: 38263987 PMCID: PMC10804332 DOI: 10.1002/osp4.716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 09/27/2023] [Accepted: 10/12/2023] [Indexed: 01/25/2024] Open
Abstract
Introduction Adipose triglyceride lipase (ATGL) is a crucial enzyme responsible for the release of fatty acids from various tissues. The expression of ATGL is regulated by insulin and this enzyme is linked to Insulin resistance (IR). On the other hand, ATGL-mediated lipolysis is connected to macrophage function and thus, ATGL is involved in inflammation and the pathogenesis of lipid-related disorders. This study aimed to investigate the correlation between ATGL, obesity, Metabolic Syndrome (MetS), and inflammation. Methods A total of 100 participants, including 50 individuals with obesity and 50 healthy participants, were recruited for this study and underwent comprehensive clinical evaluations. Blood samples were collected to measure plasma lipid profiles, glycemic indices, and liver function tests. Additionally, peripheral blood mononuclear cells (PBMCs) were isolated and used for the assessment of the gene expression of ATGL, using real-time PCR. Furthermore, PBMCs were cultured and exposed to lipopolysaccharides (LPS) with simultaneous ATGL inhibition, and the gene expression of inflammatory cytokines, along with the secretion of prostaglandin E2 (PGE2), were measured. Results The gene expression of ATGL was significantly elevated in PBMCs obtained from participants with obesity and was particularly higher in those diagnosed with MetS. It exhibited a correlation with insulin levels and Homeostatic Model Assessment for IR (HOMA-IR), and it was associated with lipid accumulation in the liver. Stimulation with LPS increased ATGL expression in PBMCs, while inhibition of ATGL attenuated the inflammatory responses induced by LPS. Conclusions Obesity and MetS were associated with dysregulation of ATGL. ATGL might play a role in the upregulation of inflammatory cytokines and act as a significant contributor to the development of metabolic abnormalities related to obesity.
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Affiliation(s)
| | - Sahar Yarahmadi
- Department of BiochemistryFaculty of MedicineIran University of Medical SciencesTehranIran
| | - Nikta Dadkhah Nikroo
- Metabolic Disorders Research CenterEndocrinology and Metabolism Molecular‐Cellular Sciences InstituteTehran University of Medical SciencesTehranIran
| | - Mohammad Hasan Maleki
- Department of BiochemistrySchool of MedicineShiraz University of Medical SciencesShirazIran
| | - Zeynab Yousefi
- Department of Clinical BiochemistryFaculty of Medical SciencesTarbiat Modares UniversityTehranIran
| | - Pegah Golpour
- Department of BiochemistryFaculty of MedicineShahid Sadoughi University of Medical SciencesTehranIran
| | - Mona Nourbakhsh
- Hazrat Aliasghar HospitalSchool of MedicineIran University of Medical SciencesTehranIran
| | - Mitra Nourbakhsh
- Finetech in Medicine Research CenterIran University of Medical SciencesTehranIran
- Department of BiochemistryFaculty of MedicineIran University of Medical SciencesTehranIran
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Shu H, Zhang J, Cheng D, Zhao X, Ma Y, Zhang C, Zhang Y, Jia Z, Liu Z. The Role of Proton-Coupled Amino Acid Transporter 2 (SLC36A2) in Cold-Induced Thermogenesis of Mice. Nutrients 2023; 15:3552. [PMID: 37630739 PMCID: PMC10458080 DOI: 10.3390/nu15163552] [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: 07/10/2023] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023] Open
Abstract
Brown adipocytes mainly utilize glucose and fatty acids to produce energy, which play key roles in thermogenesis. Furthermore, brown adipocytes also utilize other substrates, such as amino acids, for energy expenditure in various conditions. Here, we report the new physiological roles of proton-coupled amino acid transporters, SLC36A2 and SLC36A3, on global energy metabolism. The relative mRNA expression levels of both Slc36a2 and Slc36a3 were all highest in brown adipose tissue. We then generated global Slc36a2 and Slc36a3 knockout mice to investigate their functions in metabolism. Neither loss of Slc36a2 nor Slc36a3 affected the body weight and body composition of the mice. Slc36a2 knockout mice exhibited increased oxygen consumption during the daytime. After cold treatment, inhibition of Slc36a2 significantly decreased the mass of brown adipose tissue compared to wildtype mice, while it lowered the expression level of Cpt1a. Moreover, the serum lipid levels and liver mass were also decreased in Slc36a2 knockout mice after cold treatment. On the contrary, Slc36a3 knockout impaired glucose tolerance and up-regulated serum LDL-cholesterol concentration. Thus, SLC36A2 and SLC36A3 play central and different roles in the energy metabolism of the mice.
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Affiliation(s)
| | | | | | | | | | | | | | - Zhihao Jia
- Cambridge-Suda Genomic Resource Center, Suzhou Medical College, Soochow University, Suzhou 215123, China; (H.S.); (J.Z.); (Y.M.); (Y.Z.)
| | - Zhiwei Liu
- Cambridge-Suda Genomic Resource Center, Suzhou Medical College, Soochow University, Suzhou 215123, China; (H.S.); (J.Z.); (Y.M.); (Y.Z.)
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Shen ZL, Chen WH, Liu Z, Yu DY, Chen WZ, Zang WF, Zhang P, Yan XL, Yu Z. A novel insight into the key gene signature associated with the immune landscape in the progression of sarcopenia. Exp Gerontol 2023; 179:112244. [PMID: 37343810 DOI: 10.1016/j.exger.2023.112244] [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: 04/06/2023] [Revised: 06/04/2023] [Accepted: 06/18/2023] [Indexed: 06/23/2023]
Abstract
Sarcopenia is an age-related skeletal muscle disorder that causes falls, disability and death in the elderly, but its exact mechanism remains unknown. In this study, we merged three GEO datasets into the expression profiles of 118 samples and screened 22 differentially expressed genes (DEGs) as candidate genes. Pathway analysis demonstrated that the functional enrichment of DEGs is mainly in the cellular response to insulin stimulus, PPAR signaling pathway and other metabolism-related pathways. Then, we identified six key genes by machine learning, which were confirmed to be closely associated with sarcopenia by bioinformatics analysis. It was experimentally verified that SCD1 exhibits the most substantial alterations in the progression of sarcopenia with disturbed lipid metabolism and myosteatosis. In addition, the immune microenvironment of sarcopenia was found to be affected by these key genes, with Th17 cells down-regulated and NK cells up-regulated. Sarcopenic patients consequently presented a more significant systemic inflammatory state with higher CAR (p = 0.028) and PAR (p = 0.018). For the first time, we identified key genes in sarcopenia with high-throughput data and demonstrated that key genes can regulate the progression of sarcopenia by affecting the immune microenvironment. Among them, SCD1 may influence lipid metabolism and myosteatosis process. Screening of key genes and analyzing of immune microenvironment provide a more accurate target for treating sarcopenia.
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Affiliation(s)
- Zi-Le Shen
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China
| | - Wen-Hao Chen
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China; Department of Gastrointestinal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Zhang Liu
- Department of Cardio-Thoracic Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China
| | - Ding-Ye Yu
- Department of General Surgery, Huadong Hospital, Fudan University, Shanghai 200040, China
| | - Wei-Zhe Chen
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China
| | - Wang-Fu Zang
- Department of Cardio-Thoracic Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China
| | - Peng Zhang
- Department of Cardio-Thoracic Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China.
| | - Xia-Lin Yan
- Department of Colorectal Anal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China.
| | - Zhen Yu
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China; Department of Gastrointestinal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China.
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Al Saedi A, Debruin DA, Hayes A, Hamrick M. Lipid metabolism in sarcopenia. Bone 2022; 164:116539. [PMID: 36007811 DOI: 10.1016/j.bone.2022.116539] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 07/10/2022] [Accepted: 08/18/2022] [Indexed: 11/29/2022]
Abstract
Sarcopenia is an age-related disease associated with loss of muscle mass and strength. This geriatric syndrome predisposes elderly individuals to a disability, falls, fractures, and death. Fat infiltration in muscle is one of the hallmarks of sarcopenia and aging. Alterations in fatty acid (FA) metabolism are evident in aging, type 2 diabetes, and obesity, with the accumulation of lipids inside muscle cells contributing to muscle insulin resistance and ceramide accumulation. These lipids include diacylglycerol, lipid droplets, intramyocellular lipids, intramuscular triglycerides, and polyunsaturated fatty acids (PUFAs). In this review, we examine the regulation of lipid metabolism in skeletal muscle, including lipid metabolization and storage, intervention, and the types of lipases expressed in skeletal muscle responsible for the breakdown of adipose triglyceride fats. In addition, we address the role of FAs in sarcopenia and the potential benefits of PUFAs.
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Affiliation(s)
- Ahmed Al Saedi
- Australian Institute for Musculoskeletal Science (AIMSS), The University of Melbourne and Western Health, St. Albans, VIC, Australia; Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, St. Albans, VIC, Australia; Institute of Health and Sport (IHeS), Victoria University, Melbourne, VIC, Australia.
| | - Danielle A Debruin
- Australian Institute for Musculoskeletal Science (AIMSS), The University of Melbourne and Western Health, St. Albans, VIC, Australia; Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, St. Albans, VIC, Australia; Institute of Health and Sport (IHeS), Victoria University, Melbourne, VIC, Australia
| | - Alan Hayes
- Australian Institute for Musculoskeletal Science (AIMSS), The University of Melbourne and Western Health, St. Albans, VIC, Australia; Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, St. Albans, VIC, Australia; Institute of Health and Sport (IHeS), Victoria University, Melbourne, VIC, Australia
| | - Mark Hamrick
- Department of Cellular Biology & Anatomy, Medical College of Georgia, Augusta University, Laney Walker Blvd. CB2915, Augusta, GA 30912, USA
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Naryzhnaya NV, Koshelskaya OA, Kologrivova IV, Suslova TE, Kharitonova OA, Andreev SL, Gorbunov AS, Kurbatov BK, Boshchenko AA. Production of Reactive Oxygen Species by Epicardial Adipocytes Is Associated with an Increase in Postprandial Glycemia, Postprandial Insulin, and a Decrease in Serum Adiponectin in Patients with Severe Coronary Atherosclerosis. Biomedicines 2022; 10:biomedicines10082054. [PMID: 36009601 PMCID: PMC9405686 DOI: 10.3390/biomedicines10082054] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 12/26/2022] Open
Abstract
Purpose. This work investigates the relations between the production of reactive oxygen species (ROS) by epicardial adipose tissue (EAT) adipocytes and parameters of glucose/insulin metabolism, circulating adipokines levels, and severity of coronary atherosclerosis in patients with coronary artery disease (CAD); establishing significant determinants describing changes in ROS EAT in this category of patients. Material and methods. This study included 19 patients (14 men and 5 women, 53−72 y.o., 6 patients with diabetes mellitus type 2; 5 patients with prediabetes), with CAD, who underwent coronary artery bypass graft surgery. EAT adipocytes were isolated by the enzymatic method from intraoperative explants obtained during coronary artery bypass grafting. The size of EAT adipocytes and ROS level were determined. Results. The production of ROS by EAT adipocytes demonstrated a direct correlation with the level of postprandial glycemia (rs = 0.62, p < 0.05), and an inverse correlation with serum adiponectin (rs = −0.50, p = 0.026), but not with general and abdominal obesity, EAT thickness, and dyslipidemia. Regression analysis demonstrated that the increase in ROS of EAT adipocytes occurs due to the interaction of the following factors: postprandial glycemia (β = 0.95), postprandial insulin (β = 0.24), and reduced serum adiponectin (β = −0.20). EAT adipocytes in patients with diabetes and prediabetes manifested higher ROS production than in patients with normoglycemia. Although there was no correlation between the production of ROS by EAT adipocytes and Gensini score in the total group of patients, higher rates of oxidative stress were observed in EAT adipocytes from patients with a Gensini score greater than median Gensini score values (≥70.55 points, Gr.B), compared to patients with less severe coronary atherosclerosis (<70.55 points, Gr.A). Of note, the frequency of patients with diabetes and prediabetes was higher among the patients with the most severe coronary atherosclerosis (Gr.B) than in the Gr.A. Conclusions. Our data have demonstrated for the first time that systemic impairments of glucose/insulin metabolism and a decrease in serum adiponectin are significant independent determinants of oxidative stress intensity in EAT adipocytes in patients with severe coronary atherosclerosis. The possible input of the interplay between oxidative stress in EAT adipocytes and metabolic disturbances to the severity of coronary atherosclerosis requires further investigation.
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Baicalin ameliorates alcohol-induced hepatic steatosis by suppressing SREBP1c elicited PNPLA3 competitive binding to ATGL. Arch Biochem Biophys 2022; 722:109236. [DOI: 10.1016/j.abb.2022.109236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 03/17/2022] [Accepted: 04/11/2022] [Indexed: 11/15/2022]
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Fang JY, Huang TH, Chen WJ, Aljuffali IA, Hsu CY. Rhubarb hydroxyanthraquinones act as antiobesity agents to inhibit adipogenesis and enhance lipolysis. Biomed Pharmacother 2021; 146:112497. [PMID: 34891117 DOI: 10.1016/j.biopha.2021.112497] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/24/2021] [Accepted: 12/01/2021] [Indexed: 12/21/2022] Open
Abstract
Rhubarb as an herbal medicine has been shown to exhibit antiadipogenic activity. This study evaluated and compared the lipid-lowering activity of five rhubarb hydroxyanthraquinones (HAQs), including chrysophanol, aloe emodin, emodin, physcion, and rhein, aiming to identify candidate compounds for obesity treatment. Examination of the antiobesity effects of HAQs in 3T3-L1 adipocytes and high-fat diet (HFD)-induced obese rats showed that these anthraquinone compounds inhibited lipid accumulation in 3T3-L1 cells before and after differentiation. Emodin and rhein showed greater inhibition than the other compounds; dosage at 50 μM reduced intracellular triglyceride (TG) by about 30% in the differentiated adipocytes. Both compounds also revealed lipolytic effects to increase glycerol release from adipocytes. Adipokine overexpression induced by differentiation was downregulated by emodin and rhein through mitogen-activated protein kinase (MAPK) signaling. Despite their structural similarity, emodin and rhein exhibited different mechanisms on adipogenesis and lipid metabolism. Rhein restrained lipid deposition by controlling adipogenic transcriptional factors and lipolytic lipases during differentiation. The lipid-lowering effects of emodin did not use these pathways but reduced levels of lipogenic enzymes. HFD consumption in rats significantly increased body weight, visceral fat mass and adipocyte size, which were attenuated by intraperitoneal delivery of emodin or rhein. Rhein showed greater amelioration of obesity than emodin, decreasing plasma cholesterol by 29% and 14%, respectively. HAQs also suppressed cytokine upregulation in the liver and adipose tissues of obese rats. Rhein is a potential antiobesity agent through its ability to regulate obesity-associated adipogenesis, lipolysis and inflammation.
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Affiliation(s)
- Jia-You Fang
- Pharmaceutics Laboratory, Graduate Institute of Natural Products, Chang Gung University, Kweishan, Taoyuan, Taiwan; Research Center for Food and Cosmetic Safety and Research Center for Chinese Herbal Medicine, Chang Gung University of Science and Technology, Kweishan, Taoyuan, Taiwan; Department of Anesthesiology, Chang Gung Memorial Hospital, Kweishan, Taoyuan, Taiwan
| | - Tse-Hung Huang
- Research Center for Food and Cosmetic Safety and Research Center for Chinese Herbal Medicine, Chang Gung University of Science and Technology, Kweishan, Taoyuan, Taiwan; Department of Traditional Chinese Medicine, Chang Gung Memorial Hospital, Keelung, Taiwan; School of Traditional Chinese Medicine, Chang Gung University, Kweishan, Taoyuan, Taiwan; School of Nursing, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan
| | - Wei-Jhang Chen
- Pharmaceutics Laboratory, Graduate Institute of Natural Products, Chang Gung University, Kweishan, Taoyuan, Taiwan
| | - Ibrahim A Aljuffali
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, SaudiArabia
| | - Ching-Yun Hsu
- Research Center for Food and Cosmetic Safety and Research Center for Chinese Herbal Medicine, Chang Gung University of Science and Technology, Kweishan, Taoyuan, Taiwan; Department of Nutrition and Health Sciences, Chang Gung University of Science and Technology, Kweishan, Taoyuan, Taiwan.
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Quarta S, Scoditti E, Carluccio MA, Calabriso N, Santarpino G, Damiano F, Siculella L, Wabitsch M, Verri T, Favari C, Del Rio D, Mena P, De Caterina R, Massaro M. Coffee Bioactive N-Methylpyridinium Attenuates Tumor Necrosis Factor (TNF)-α-Mediated Insulin Resistance and Inflammation in Human Adipocytes. Biomolecules 2021; 11:biom11101545. [PMID: 34680177 PMCID: PMC8534185 DOI: 10.3390/biom11101545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/12/2021] [Accepted: 10/15/2021] [Indexed: 12/05/2022] Open
Abstract
Although coffee consumption has been historically associated with negative health outcomes, recent evidence suggests a lower risk of metabolic syndrome, obesity and diabetes among regular coffee drinkers. Among the plethora of minor organic compounds assessed as potential mediators of coffee health benefits, trigonelline and its pyrolysis product N-methylpyridinium (NMP) were preliminary shown to promote glucose uptake and exert anti-adipogenic properties. Against this background, we aimed at characterizing the effects of trigonelline and NMP in inflamed and dysfunctional human adipocytes. Human Simpson-Golabi-Behmel syndrome (SGBS) adipocytes were treated with NMP or, for comparison, trigonelline, for 5 h before stimulation with tumor necrosis factor (TNF)-α. NMP at concentrations as low as 1 µmol/L reduced the stimulated expression of several pro-inflammatory mediators, including C-C Motif chemokine ligand (CCL)-2, C-X-C Motif chemokine ligand (CXCL)-10, and intercellular adhesion Molecule (ICAM)-1, but left the induction of prostaglandin G/H synthase (PTGS)2, interleukin (IL)-1β, and colony stimulating factor (CSF)1 unaffected. Furthermore, NMP restored the downregulated expression of adiponectin (ADIPOQ). These effects were functionally associated with downregulation of the adhesion of monocytes to inflamed adipocytes. Under the same conditions, NMP also reversed the TNF-α-mediated suppression of insulin-stimulated Ser473 Akt phosphorylation and attenuated the induction of TNF-α-stimulated lipolysis restoring cell fat content. In an attempt to preliminarily explore the underlying mechanisms of its action, we show that NMP restores the expression of the master regulator of adipocyte differentiation peroxisome proliferator-activated receptor (PPAR)γ and downregulates activation of the pro-inflammatory mitogen-activated protein jun N-terminal kinase (JNK). In conclusion, NMP reduces adipose dysfunction in pro-inflammatory activated adipocytes. These data suggest that bioactive NMP in coffee may improve the inflammatory and dysmetabolic milieu associated with obesity.
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Affiliation(s)
- Stefano Quarta
- Department of Biological and Environmental Sciences and Technologies (DISTEBA), University of Salento, 73100 Lecce, Italy; (S.Q.); (F.D.); (L.S.); (T.V.)
| | - Egeria Scoditti
- Institute of Clinical Physiology (IFC), National Research Council (CNR), 73100 Lecce, Italy; (E.S.); (M.A.C.); (N.C.)
| | - Maria Annunziata Carluccio
- Institute of Clinical Physiology (IFC), National Research Council (CNR), 73100 Lecce, Italy; (E.S.); (M.A.C.); (N.C.)
| | - Nadia Calabriso
- Institute of Clinical Physiology (IFC), National Research Council (CNR), 73100 Lecce, Italy; (E.S.); (M.A.C.); (N.C.)
| | - Giuseppe Santarpino
- Cardiovascular Center, Paracelsus Medical University, 90471 Nuremberg, Germany;
- GVM Care & Research, Città di Lecce Hospital, 73100 Lecce, Italy
- Cardiac Surgery Unit, Department of Experimental and Clinical Medicine, University “Magna Graecia”, 88100 Catanzaro, Italy
| | - Fabrizio Damiano
- Department of Biological and Environmental Sciences and Technologies (DISTEBA), University of Salento, 73100 Lecce, Italy; (S.Q.); (F.D.); (L.S.); (T.V.)
| | - Luisa Siculella
- Department of Biological and Environmental Sciences and Technologies (DISTEBA), University of Salento, 73100 Lecce, Italy; (S.Q.); (F.D.); (L.S.); (T.V.)
| | - Martin Wabitsch
- Division of Pediatric Endocrinology, Diabetes and Obesity, Department of Pediatrics and Adolescent Medicine, University of Ulm, 89075 Ulm, Germany;
| | - Tiziano Verri
- Department of Biological and Environmental Sciences and Technologies (DISTEBA), University of Salento, 73100 Lecce, Italy; (S.Q.); (F.D.); (L.S.); (T.V.)
| | - Claudia Favari
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, 43125 Parma, Italy; (C.F.); (D.D.R.); (P.M.)
| | - Daniele Del Rio
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, 43125 Parma, Italy; (C.F.); (D.D.R.); (P.M.)
| | - Pedro Mena
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, 43125 Parma, Italy; (C.F.); (D.D.R.); (P.M.)
| | - Raffaele De Caterina
- Cardiology Division, Pisa University Hospital, 56126 Pisa, Italy
- Fondazione Villa Serena per la Ricerca, Città Sant’Angelo, 65013 Pescara, Italy
- Correspondence: (R.D.C.); (M.M.); Tel.: +39-050-996-751 (R.D.C.); +39-083-229-8860 (M.M.)
| | - Marika Massaro
- Institute of Clinical Physiology (IFC), National Research Council (CNR), 73100 Lecce, Italy; (E.S.); (M.A.C.); (N.C.)
- Correspondence: (R.D.C.); (M.M.); Tel.: +39-050-996-751 (R.D.C.); +39-083-229-8860 (M.M.)
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12
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Yin H, Li W, Mo L, Deng S, Lin W, Ma C, Luo Z, Luo C, Hong H. Adipose triglyceride lipase promotes the proliferation of colorectal cancer cells via enhancing the lipolytic pathway. J Cell Mol Med 2021; 25:3963-3975. [PMID: 33621408 PMCID: PMC8051714 DOI: 10.1111/jcmm.16349] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 01/04/2021] [Accepted: 01/28/2021] [Indexed: 12/15/2022] Open
Abstract
Abnormal lipid metabolism is the sign of tumour cells. Previous researches have revealed that the lipolytic pathway may contribute to the progression of colorectal cancer (CRC). However, adipose triglyceride lipase (ATGL) role in CRC cells remains unclear. Here, we find that elevated ATGL positively correlates with CRC clinical stages and negatively associates with overall survival. Overexpression of ATGL significantly promotes CRC cell proliferation, while knockdown of ATGL inhibits the proliferation and promotes the apoptosis of CRC cells in vitro. Moreover, in vivo experiments, ATGL promotes the growth of CRC cells. Mechanistically, ATGL enhances the carcinogenic function of CRC cells via promoting sphingolipid metabolism and CoA biosynthesis pathway‐related gene levels by degrading triglycerides, which provides adequate nutrition for the progression of CRC. Our researches clarify for the first time that ATGL is a novel oncogene in CRC and may provide an important prognostic factor and therapeutic target for CRC.
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Affiliation(s)
- Haofan Yin
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Wentao Li
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Laiming Mo
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Shaotuan Deng
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Weijia Lin
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Caiqi Ma
- Reproductive Medical Center, Guangzhou Women and Children's Medical Center of Sun Yat-sen University, Guangzhou, China
| | - Zhaofan Luo
- Department of Clinical Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, China
| | - Chuanghua Luo
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Honghai Hong
- Department of Clinical Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
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13
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Ren H, Liu TC, Lu Y, Zhang K, Xu Y, Zhou P, Tang X. A comparison study of the influence of milk protein versus whey protein in high-protein diets on adiposity in rats. Food Funct 2021; 12:1008-1019. [PMID: 33502407 DOI: 10.1039/d0fo01960g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
High-protein diets are known to reduce weight and fat deposition. However, there have been only a few studies on the efficacy of different types of high-protein diets in preventing obesity. Therefore, the emphasis of this study lies in comparing the efficacy of two high-protein diets (milk protein and whey protein) in preventing obesity and exploring specific mechanisms. Eighty Sprague Dawley rats were divided into two groups and fed with milk protein concentrate (MPC) and whey protein concentrate (WPC) for 12 weeks. Each group was divided into four levels: two low-fat regimens with either low or high protein content (L-14%, L-40%) and two high-fat regimens with either low or high protein content (H-14%, H-40%). The studies we have performed showed that rats treated with MPC at the 40% protein level had significantly reduced body weight, fat weight and fat ratio gain induced by a high-fat diet, while the protein level in the WPC group had no effect on body weight or body fat in rats fed with a high-fat diet. What is more, rats fed with MPC at the H-40% energy level showed a significant decrease in plasma triglyceride, total cholesterol and low-density lipoprotein cholesterol levels and a significant increase in plasma high-density lipoprotein cholesterol levels compared with the H-14% energy level group. In contrast, in the WPC groups, increasing the protein content in high-fat diets had no significant influence on plasma lipid levels. The results of the amino acid composition of the two proteins and plasma showed that the MPC diet of 40% protein level increased the transsulfuration pathway in rats, thereby increasing the level of H2S. This research work has shown that not all types of high-protein diets can effectively prevent obesity induced by high-fat diets, as effectiveness depends on the amino acid composition of the protein.
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Affiliation(s)
- Haoyi Ren
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China.
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14
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Ow JR, Cadez MJ, Zafer G, Foo JC, Li HY, Ghosh S, Wollmann H, Cazenave-Gassiot A, Ong CB, Wenk MR, Han W, Choi H, Kaldis P. Remodeling of whole-body lipid metabolism and a diabetic-like phenotype caused by loss of CDK1 and hepatocyte division. eLife 2020; 9:63835. [PMID: 33345777 PMCID: PMC7771968 DOI: 10.7554/elife.63835] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 12/19/2020] [Indexed: 12/13/2022] Open
Abstract
Cell cycle progression and lipid metabolism are well-coordinated processes required for proper cell proliferation. In liver diseases that arise from dysregulated lipid metabolism, hepatocyte proliferation is diminished. To study the outcome of CDK1 loss and blocked hepatocyte proliferation on lipid metabolism and the consequent impact on whole-body physiology, we performed lipidomics, metabolomics, and RNA-seq analyses on a mouse model. We observed reduced triacylglycerides in liver of young mice, caused by oxidative stress that activated FOXO1 to promote the expression of Pnpla2/ATGL. Additionally, we discovered that hepatocytes displayed malfunctioning β-oxidation, reflected by increased acylcarnitines (ACs) and reduced β-hydroxybutyrate. This led to elevated plasma free fatty acids (FFAs), which were transported to the adipose tissue for storage and triggered greater insulin secretion. Upon aging, chronic hyperinsulinemia resulted in insulin resistance and hepatic steatosis through activation of LXR. Here, we demonstrate that loss of hepatocyte proliferation is not only an outcome but also possibly a causative factor for liver pathology.
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Affiliation(s)
- Jin Rong Ow
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Matias J Cadez
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore
| | - Gözde Zafer
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore
| | - Juat Chin Foo
- Singapore Lipidomics Incubator (SLING), Life Sciences Institute, National University of Singapore (NUS), Singapore, Singapore
| | - Hong Yu Li
- Laboratory of Metabolic Medicine, Singapore Bioimaging Consortium (SBIC), A*STAR, Singapore, Singapore
| | - Soumita Ghosh
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore
| | - Heike Wollmann
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Amaury Cazenave-Gassiot
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore.,Singapore Lipidomics Incubator (SLING), Life Sciences Institute, National University of Singapore (NUS), Singapore, Singapore
| | - Chee Bing Ong
- Biological Resource Centre (BRC), A*STAR, Singapore, Singapore
| | - Markus R Wenk
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore.,Singapore Lipidomics Incubator (SLING), Life Sciences Institute, National University of Singapore (NUS), Singapore, Singapore
| | - Weiping Han
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore.,Laboratory of Metabolic Medicine, Singapore Bioimaging Consortium (SBIC), A*STAR, Singapore, Singapore
| | - Hyungwon Choi
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore
| | - Philipp Kaldis
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore, Singapore.,Department of Clinical Sciences, Lund University, Clinical Research Centre (CRC), Malmö, Sweden
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15
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Sun J, Li H, Luo X, Lu R, Ji H. Identification and characterization of two isoforms of acyl-coenzyme A oxidase 1 gene and their expression in fasting-induced grass carp Ctenopharyngodon idella adipocyte lipolysis. FISH PHYSIOLOGY AND BIOCHEMISTRY 2020; 46:1645-1652. [PMID: 32601856 DOI: 10.1007/s10695-020-00816-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
Acyl-coenzyme A oxidases 1 (ACOX1) is the first rate-limiting enzyme responsible for peroxisomal β-oxidation. In the present study, two mRNA variants, ACOX1a and ACOX1b, transcribed from a single gene, were for the first time isolated and characterized from grass carp Ctenopharyngodon idella, both encoding putative peptides of 660 amino acids. Analysis of the exon-intron structures clarified that grass carp ACOX1a and ACOX1b comprise 14 coding exons and correspond to 3a and 3b isoforms of exon 3 splicing variants. Both ACOX1a and ACOX1b mRNAs were expressed in a wide range of tissues, but the abundance of each ACOX1 mRNA showed the tissue-dependent expression patterns. Time-course analysis of ACOX1 expressions indicated that the level of ACOX1a mRNA reached an almost maximal level at day 2, while that of ACOX1b mRNA reached an almost maximal level at day 8 during grass carp primary preadipocyte differentiation. In fasting-induced adipocyte lipolysis, only ACOX1a showed a significant increase in adipocyte, indicating that two ACOX1 isoforms may serve somewhat different roles in the peroxisomal β-oxidation. These results suggested that grass carp ACOX1a and ACOX1b were differently modulated by fasting in adipocyte. In addition, we found that mitochondrial β-oxidation might dominate at the early stage of fasting in adipocytes, indicating that mitochondria and peroxisomes might possess different capacities in fasting-induced adipocytes fatty acid oxidation.
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Affiliation(s)
- Jian Sun
- College of Animal Science and Technology, Northwest Agriculture and Forestry University, Yangling, 712100, China
| | - Handong Li
- College of Animal Science and Technology, Northwest Agriculture and Forestry University, Yangling, 712100, China
| | - Xiaolong Luo
- College of Animal Science and Technology, Northwest Agriculture and Forestry University, Yangling, 712100, China
| | - Ronghua Lu
- College of Fisheries, Henan Normal University, Xinxiang, 453007, China.
| | - Hong Ji
- College of Animal Science and Technology, Northwest Agriculture and Forestry University, Yangling, 712100, China.
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16
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Xie H, Heier C, Kien B, Vesely PW, Tang Z, Sexl V, Schoiswohl G, Strießnig-Bina I, Hoefler G, Zechner R, Schweiger M. Adipose triglyceride lipase activity regulates cancer cell proliferation via AMP-kinase and mTOR signaling. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158737. [PMID: 32404277 PMCID: PMC7397471 DOI: 10.1016/j.bbalip.2020.158737] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 04/15/2020] [Accepted: 05/06/2020] [Indexed: 12/25/2022]
Abstract
Aberrant fatty acid (FA) metabolism is a hallmark of proliferating cells, including untransformed fibroblasts or cancer cells. Lipolysis of intracellular triglyceride (TG) stores by adipose triglyceride lipase (ATGL) provides an important source of FAs serving as energy substrates, signaling molecules, and precursors for membrane lipids. To investigate if ATGL-mediated lipolysis impacts cell proliferation, we modified ATGL activity in murine embryonic fibroblasts (MEFs) and in five different cancer cell lines to determine the consequences on cell growth and metabolism. Genetic or pharmacological inhibition of ATGL in MEFs causes impaired FA oxidation, decreased ROS production, and a substrate switch from FA to glucose leading to decreased AMPK-mTOR signaling and higher cell proliferation rates. ATGL expression in these cancer cells is low when compared to MEFs. Additional ATGL knockdown in cancer cells did not significantly affect cellular lipid metabolism or cell proliferation whereas the ectopic overexpression of ATGL increased lipolysis and reduced proliferation. In contrast to ATGL silencing, pharmacological inhibition of ATGL by Atglistatin© impeded the proliferation of diverse cancer cell lines, which points at an ATGL-independent effect. Our data indicate a crucial role of ATGL-mediated lipolysis in the regulation of cell proliferation. The observed low ATGL activity in cancer cells may represent an evolutionary selection process and mechanism to sustain high cell proliferation rates. As the increasing ATGL activity decelerates proliferation of five different cancer cell lines this may represent a novel therapeutic strategy to counteract uncontrolled cell growth.
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Affiliation(s)
- Hao Xie
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Christoph Heier
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Benedikt Kien
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria
| | - Paul W Vesely
- Institute of Pathology, Medical University of Graz, Graz 8010, Austria
| | - Zhiyuan Tang
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong 226001, China
| | - Veronika Sexl
- Institute of Pharmacology and Toxicology, University of Veterinary Medicine, Vienna 1210, Austria
| | | | | | - Gerald Hoefler
- Institute of Pathology, Medical University of Graz, Graz 8010, Austria
| | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria; BioTechMed-Graz, Mozartgasse 12/II, Graz 8010, Austria.
| | - Martina Schweiger
- Institute of Molecular Biosciences, University of Graz, Graz 8010, Austria.
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17
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Dave DT, Patel BM. Mitochondrial Metabolism in Cancer Cachexia: Novel Drug Target. Curr Drug Metab 2020; 20:1141-1153. [PMID: 31418657 DOI: 10.2174/1389200220666190816162658] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 07/23/2019] [Accepted: 07/25/2019] [Indexed: 12/15/2022]
Abstract
BACKGROUND Cancer cachexia is a metabolic syndrome prevalent in the majority of the advanced cancers and is associated with complications such as anorexia, early satiety, weakness, anaemia, and edema, thereby reducing performance and impairing quality of life. Skeletal muscle wasting is a characteristic feature of cancer-cachexia and mitochondria is responsible for regulating total protein turnover in skeletal muscle tissue. METHODS We carried out exhaustive search for cancer cachexia and role of mitochondria in the same in various databases. All the relevant articles were gathered and the pertinent information was extracted out and compiled which was further structured into different sub-sections. RESULTS Various findings on the mitochondrial alterations in connection to its disturbed normal physiology in various models of cancer-cachexia have been recently reported, suggesting a significant role of the organelle in the pathogenesis of the complications involved in the disorder. It has also been reported that reduced mitochondrial oxidative capacity is due to reduced mitochondrial biogenesis as well as altered balance between fusion and fission protein activities. Moreover, autophagy in mitochondria (termed as mitophagy) is reported to play an important role in cancer cachexia. CONCLUSION The present review aims to put forth the changes occurring in mitochondria and hence explore possible targets which can be exploited in cancer-induced cachexia for treatment of such a debilitating condition.
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Affiliation(s)
- Dhwani T Dave
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Sarkhej-Gandhinagar Highway, Ahmedabad 382481, Gujarat, India
| | - Bhoomika M Patel
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Sarkhej-Gandhinagar Highway, Ahmedabad 382481, Gujarat, India
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18
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Aquilano K, Sciarretta F, Turchi R, Li BH, Rosina M, Ceci V, Guidobaldi G, Arena S, D'Ambrosio C, Audano M, Salvatori I, Colella B, Faraonio R, Panebianco C, Pazienza V, Caruso D, Mitro N, Di Bartolomeo S, Scaloni A, Li JY, Lettieri-Barbato D. Low-protein/high-carbohydrate diet induces AMPK-dependent canonical and non-canonical thermogenesis in subcutaneous adipose tissue. Redox Biol 2020; 36:101633. [PMID: 32863211 PMCID: PMC7358542 DOI: 10.1016/j.redox.2020.101633] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/02/2020] [Accepted: 07/03/2020] [Indexed: 02/07/2023] Open
Abstract
Low-protein/high-carbohydrate (LPHC) diet has been suggested to promote metabolic health and longevity in adult humans and animal models. However, the complex molecular underpinnings of how LPHC diet leads to metabolic benefits remain elusive. Through a multi-layered approach, here we observed that LPHC diet promotes an energy-dissipating response consisting in the parallel recruitment of canonical and non-canonical (muscular) thermogenic systems in subcutaneous white adipose tissue (sWAT). In particular, we measured Ucp1 induction in association with up-regulation of actomyosin components and several Serca (Serca1, Serca2a, Serca2b) ATPases. In beige adipocytes, we observed that AMPK activation is responsible for transducing the amino acid lowering in an enhanced fat catabolism, which sustains both Ucp1-and Serca-dependent energy dissipation. Limiting AMPK activation counteracts the expression of brown fat and muscular genes, including Ucp1 and Serca, as well as mitochondrial oxidative genes. We observed that mitochondrial reactive oxygen species are the upstream molecules controlling AMPK-mediated metabolic rewiring in amino acid-restricted beige adipocytes. Our findings delineate a novel metabolic phenotype of responses to amino acid shortage, which recapitulates some of the benefits of cool temperature in sWAT. In conclusion, this highlights LPHC diet as a valuable and practicable strategy to prevent metabolic diseases through the enhancement of mitochondrial oxidative metabolism and the recruitment of different energy dissipating routes in beige adipocytes. LPHC diet promotes brown- and muscular-like features in sWAT. In vitro amino acid shortage mimics the effects of LPHC diet. AMPK controls canonical and non-canonical thermogenesis in sWAT. L-Cys replenishment limits the AMPK-mediated adaptive responses in sWAT.
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Affiliation(s)
- Katia Aquilano
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy.
| | | | - Riccardo Turchi
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy
| | - Bo-Han Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Marco Rosina
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy
| | - Veronica Ceci
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy
| | - Giulio Guidobaldi
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy
| | - Simona Arena
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, Naples, Italy
| | - Chiara D'Ambrosio
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, Naples, Italy
| | - Matteo Audano
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | | | - Barbara Colella
- Department of Biosciences and Territory, University of Molise, Pesche, IS, Italy
| | - Raffaella Faraonio
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Concita Panebianco
- Gastroenterology Unit, Fondazione-IRCCS "Casa Sollievo Della Sofferenza" Hospital, San Giovanni Rotondo, FG, Italy
| | - Valerio Pazienza
- Gastroenterology Unit, Fondazione-IRCCS "Casa Sollievo Della Sofferenza" Hospital, San Giovanni Rotondo, FG, Italy
| | - Donatella Caruso
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Nico Mitro
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | | | - Andrea Scaloni
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, Naples, Italy
| | - Jing-Ya Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Daniele Lettieri-Barbato
- Department Biology, University of Rome Tor Vergata, Via Della Ricerca Scientifica, Rome, Italy; IRCCS Fondazione Santa Lucia, Rome, Italy.
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19
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Adipose Tissue and FoxO1: Bridging Physiology and Mechanisms. Cells 2020; 9:cells9040849. [PMID: 32244542 PMCID: PMC7226803 DOI: 10.3390/cells9040849] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/23/2020] [Accepted: 03/30/2020] [Indexed: 12/22/2022] Open
Abstract
Forkhead box O class proteins (FoxOs) are expressed nearly in all tissues and are involved in different functions such as energy metabolism, redox homeostasis, differentiation, and cell cycle arrest. The plasticity of FoxOs is demonstrated by post-translational modifications that determine diverse levels of transcriptional regulations also controlled by their subcellular localization. Among the different members of the FoxO family, we will focus on FoxO1 in adipose tissue, where it is abundantly expressed and is involved in differentiation and transdifferentiation processes. The capability of FoxO1 to respond differently in dependence of adipose tissue subtype underlines the specific involvement of the transcription factor in energy metabolism and the “browning” process of adipocytes. FoxO1 can localize to nuclear, cytoplasm, and mitochondrial compartments of adipocytes responding to different availability of nutrients and source of reactive oxygen species (ROS). Specifically, fasted state produced-ROS enhance the nuclear activity of FoxO1, triggering the transcription of lipid catabolism and antioxidant response genes. The enhancement of lipid catabolism, in combination with ROS buffering, allows systemic energetic homeostasis and metabolic adaptation of white/beige adipocytes. On the contrary, a fed state induces FoxO1 to accumulate in the cytoplasm, but also in the mitochondria where it affects mitochondrial DNA gene expression. The importance of ROS-mediated signaling in FoxO1 subcellular localization and retrograde communication will be discussed, highlighting key aspects of FoxO1 multifaceted regulation in adipocytes.
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Fasano C, Disciglio V, Bertora S, Lepore Signorile M, Simone C. FOXO3a from the Nucleus to the Mitochondria: A Round Trip in Cellular Stress Response. Cells 2019; 8:cells8091110. [PMID: 31546924 PMCID: PMC6769815 DOI: 10.3390/cells8091110] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 09/16/2019] [Accepted: 09/18/2019] [Indexed: 12/25/2022] Open
Abstract
Cellular stress response is a universal mechanism that ensures the survival or negative selection of cells in challenging conditions. The transcription factor Forkhead box protein O3 (FOXO3a) is a core regulator of cellular homeostasis, stress response, and longevity since it can modulate a variety of stress responses upon nutrient shortage, oxidative stress, hypoxia, heat shock, and DNA damage. FOXO3a activity is regulated by post-translational modifications that drive its shuttling between different cellular compartments, thereby determining its inactivation (cytoplasm) or activation (nucleus and mitochondria). Depending on the stress stimulus and subcellular context, activated FOXO3a can induce specific sets of nuclear genes, including cell cycle inhibitors, pro-apoptotic genes, reactive oxygen species (ROS) scavengers, autophagy effectors, gluconeogenic enzymes, and others. On the other hand, upon glucose restriction, 5′-AMP-activated protein kinase (AMPK) and mitogen activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) -dependent FOXO3a mitochondrial translocation allows the transcription of oxidative phosphorylation (OXPHOS) genes, restoring cellular ATP levels, while in cancer cells, mitochondrial FOXO3a mediates survival upon genotoxic stress induced by chemotherapy. Interestingly, these target genes and their related pathways are diverse and sometimes antagonistic, suggesting that FOXO3a is an adaptable player in the dynamic homeostasis of normal and stressed cells. In this review, we describe the multiple roles of FOXO3a in cellular stress response, with a focus on both its nuclear and mitochondrial functions.
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Affiliation(s)
- Candida Fasano
- National Institute of Gastroenterology, "S. de Bellis" Research Hospital, 70013 Castellana Grotte (Bari), Italy.
| | - Vittoria Disciglio
- National Institute of Gastroenterology, "S. de Bellis" Research Hospital, 70013 Castellana Grotte (Bari), Italy.
| | - Stefania Bertora
- National Institute of Gastroenterology, "S. de Bellis" Research Hospital, 70013 Castellana Grotte (Bari), Italy.
| | - Martina Lepore Signorile
- National Institute of Gastroenterology, "S. de Bellis" Research Hospital, 70013 Castellana Grotte (Bari), Italy.
- Department of Molecular Medicine, Sapienza University of Rome, 00161 Roma, Italy.
| | - Cristiano Simone
- National Institute of Gastroenterology, "S. de Bellis" Research Hospital, 70013 Castellana Grotte (Bari), Italy.
- Division of Medical Genetics, Department of Biomedical Sciences and Human Oncology (DIMO), University of Bari Aldo Moro, 70124 Bari, Italy.
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Aquilano K, Ceci V, Gismondi A, De Stefano S, Iacovelli F, Faraonio R, Di Marco G, Poerio N, Minutolo A, Minopoli G, Marcone A, Fraziano M, Tortolici F, Sennato S, Casciardi S, Potestà M, Bernardini R, Mattei M, Falconi M, Montesano C, Rufini S, Canini A, Lettieri-Barbato D. Adipocyte metabolism is improved by TNF receptor-targeting small RNAs identified from dried nuts. Commun Biol 2019; 2:317. [PMID: 31453381 PMCID: PMC6704100 DOI: 10.1038/s42003-019-0563-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 07/30/2019] [Indexed: 01/22/2023] Open
Abstract
There is a growing interest in therapeutically targeting the inflammatory response that underlies age-related chronic diseases including obesity and type 2 diabetes. Through integrative small RNA sequencing, we show the presence of conserved plant miR159a and miR156c in dried nuts having high complementarity with the mammalian TNF receptor superfamily member 1a (Tnfrsf1a) transcript. We detected both miR159a and miR156c in exosome-like nut nanovesicles (NVs) and demonstrated that such NVs reduce Tnfrsf1a protein and dampen TNF-α signaling pathway in adipocytes. Synthetic single-stranded microRNAs (ss-miRs) modified with 2'-O-methyl group function as miR mimics. In plants, this modification naturally occurs on nearly all small RNAs. 2'-O-methylated ss-miR mimics for miR156c and miR159a decreased Tnfrsf1a protein and inflammatory markers in hypertrophic as well as TNF-α-treated adipocytes and macrophages. miR156c and miR159a mimics effectively suppress inflammation in mice, highlighting a potential role of plant miR-based, single-stranded oligonucleotides in treating inflammatory-associated metabolic diseases.
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Affiliation(s)
- Katia Aquilano
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Veronica Ceci
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Angelo Gismondi
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Susanna De Stefano
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
| | | | - Raffaella Faraonio
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | | | - Noemi Poerio
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | | | - Giuseppina Minopoli
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Antonia Marcone
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | | | - Flavia Tortolici
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Simona Sennato
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Rome, Italy
| | - Stefano Casciardi
- Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, National Institute for Insurance against Accidents at Work (INAIL) Research, Rome, Italy
| | - Marina Potestà
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Roberta Bernardini
- Interdepartmental Service Center-Station for Anima Technology (STA), University of Rome Tor Vergata, Rome, Italy
| | - Maurizio Mattei
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
- Interdepartmental Service Center-Station for Anima Technology (STA), University of Rome Tor Vergata, Rome, Italy
| | - Mattia Falconi
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Carla Montesano
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Stefano Rufini
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Antonella Canini
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Daniele Lettieri-Barbato
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
- IRCCS Fondazione Santa Lucia, 00143 Rome, Italy
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22
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Sun J, Huang X, Ji S, Ji H. Two faces of PPARα/NFκB signaling pathway in inflammatory responses to adipocytes lipolysis in grass carp Ctenopharyngodon idella. FISH & SHELLFISH IMMUNOLOGY 2019; 90:244-249. [PMID: 31029776 DOI: 10.1016/j.fsi.2019.04.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 04/18/2019] [Accepted: 04/24/2019] [Indexed: 06/09/2023]
Abstract
Adipose tissue plays an important role in energy reservation, also be considered as vital immunological organ in animals. Adipocytes are the basic unit of adipose tissue, while little is known about the relationship between lipid metabolism and inflammatory response in fish adipocytes so far. In this study, forskolin was used to induce adipocyte lipolysis, and 5 μM forskolin and 30 μM forskolin both triggered lipolysis by increasing ATGL expression. Consequently, 30 μM Forskolin instead of 5 μM Forskolin induced the expression of NF-κB and its target pro-inflammatory cytokine genes including MCP-1, IL-6 and TNF-α. Further study found that low grade rate of lipolysis activated PPARα gene, and its inhibitory effect on the mRNA expression of NF-κB and its target genes inhibited the adipocyte inflammation. On the contrary, high grade rate of lipolysis increased the expression levels of NF-κB and its target genes, while their expression were attenuated by inhibition of reactive oxygen species (ROS) using α-tocopherol, suggesting that ROS generated due to the PPARα-mediated oxidation of released fatty acids from lipolysis may contribute to adipocyte inflammation. These results indicated that PPARα has dose effect in inflammatory responses to adipocyte lipolysis in grass carp. Taken together, grass carp adipocytes have immune activity. The inflammatory response is linked to the grade rate of adipocyte lipolysis in grass carp adipocytes, and excessive adipocyte lipolysis may promote a dynamic immune response in adipose tissue. This is the first study showing the regulatory effects of lipolysis on immune functions in fish adipocytes.
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Affiliation(s)
- Jian Sun
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - XiaoCheng Huang
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - ShangHong Ji
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - Hong Ji
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China.
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Lettieri-Barbato D, Ioannilli L, Aquilano K, Ciccarone F, Rosina M, Ciriolo MR. FoxO1 localizes to mitochondria of adipose tissue and is affected by nutrient stress. Metabolism 2019; 95:84-92. [PMID: 30974111 DOI: 10.1016/j.metabol.2019.04.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 04/04/2019] [Accepted: 04/05/2019] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Mitochondria play pivotal roles in orchestrating signaling pathways in order to guarantee metabolic homeostasis under different stimuli. It has been demonstrated that the mito-nuclear communication is fundamental for facing physiological and/or stress-mediated cellular response through the activation of nuclear transcription factors. Here, we focused on the Forkhead box protein O1 (FoxO1) transcription factor that belongs to the FoxOs family proteins and is considered a "nutrients sensor" modulating the expression of nutrient-stress response genes. METHODS In vitro and in vivo experimental systems, including 3T3-L1 white, X-9 beige and T37i brown adipocytes and different fat depots from C57BL/6 mice were used. The mitochondrial localization of FoxO1 was demonstrated by western blot analysis, confocal microscopy and chromatin immunoprecipitation assay, after sub-cellular compartment isolation. RT-qPCR analysis was used to evaluate the expression of antioxidant and mitochondrial genes after modulation of FoxO1 activity/localization. Treatment with diverse reactive oxygen species (ROS) species/sources were performed and assessed by cytofluorimetric analysis. RESULTS We demonstrated that FoxO1 not exclusively localizes to cytosol and nucleus of adipocytes but also to mitochondria where it binds to mitochondrial DNA. We also proved that mitochondrial FoxO1 is phosphorylated upon normal feeding condition. Mitochondrial FoxO1 responds to starvation leaving mitochondrial compartment by ROS-mediated activation of the mitochondrial phosphatase PTPMT1. Indeed, FoxO1 de-phosphorylation and mito-to-nucleus shuttling was observed under starvation. Moreover, we provided evidence that ROS species/sources are able to differently modulate the mitochondrial localization of FoxO1. CONCLUSION The ability to localize at different cell compartments, including mitochondria, highlights a different layer of regulation of FoxO1 necessary for assuring a fast and efficient nutrient-stress response in white/beige adipose tissue. FoxO1 could be thus endorsed in the list of transcription factors involved in the mito-nuclear communication where ROS can act as upstream signals.
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Affiliation(s)
- Daniele Lettieri-Barbato
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Laura Ioannilli
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Katia Aquilano
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Fabio Ciccarone
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Marco Rosina
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Maria Rosa Ciriolo
- Dept. of Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica, 00133 Rome, Italy; IRCCS San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy.
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24
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Abstract
Background Thermogenic adipocytes reorganize their metabolism during cold exposure. Metabolic reprogramming requires readily available bioenergetics substrates, such as glucose and fatty acids, to increase mitochondrial respiration and produce heat via the uncoupling protein 1 (UCP1). This condition generates a finely-tuned production of mitochondrial reactive oxygen species (ROS) that support non-shivering thermogenesis. Scope of review Herein, the findings underlining the mechanisms that regulate ROS production and control of the adaptive responses tuning thermogenesis in adipocytes are described. Furthermore, this review describes the metabolic responses to substrate availability and the consequence of mitochondrial failure to switch fuel oxidation in response to changes in nutrient availability. A framework to control mitochondrial ROS threshold to maximize non-shivering thermogenesis in adipocytes is provided. Major conclusions Thermogenesis synchronizes fuel oxidation with an acute and transient increase of mitochondrial ROS that promotes the activation of redox-sensitive thermogenic signaling cascade and UCP1. However, an overload of substrate flux to mitochondria causes a massive and damaging mitochondrial ROS production that affects mitochondrial flexibility. Finding novel thermogenic redox targets and manipulating ROS concentration in adipocytes appears to be a promising avenue of research for improving thermogenesis and counteracting metabolic diseases. Mitochondrial ROS support non-shivering thermogenesis. Thermogenic ROS are tightly related to mitochondrial metabolic reorganization. Uncontrolled mitochondrial ROS production is causative of metabolic inflexibility.
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25
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Limongi D, Baldelli S, Checconi P, Marcocci ME, De Chiara G, Fraternale A, Magnani M, Ciriolo MR, Palamara AT. GSH-C4 Acts as Anti-inflammatory Drug in Different Models of Canonical and Cell Autonomous Inflammation Through NFκB Inhibition. Front Immunol 2019; 10:155. [PMID: 30787932 PMCID: PMC6372722 DOI: 10.3389/fimmu.2019.00155] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 01/17/2019] [Indexed: 01/06/2023] Open
Abstract
An imbalance in GSH/GSSG ratio represents a triggering event in pro-inflammatory cytokine production and inflammatory response. However, the molecular mechanism(s) through which GSH regulates macrophage and cell autonomous inflammation remains not deeply understood. Here, we investigated the effects of a derivative of GSH, the N-butanoyl glutathione (GSH-C4), a cell permeable compound, on lipopolisaccharide (LPS)-stimulated murine RAW 264.7 macrophages, and human macrophages. LPS alone induces a significant production of pro-inflammatory cytokines, such as IL-1β, IL-6, and TNF-α and a significant decrement of GSH content. Such events were significantly abrogated by treatment with GSH-C4. Moreover, GSH-C4 was highly efficient in buffering cell autonomous inflammatory status of aged C2C12 myotubes and 3T3-L1 adipocytes by suppressing the production of pro-inflammatory cytokines. We found that inflammation was paralleled by a strong induction of the phosphorylated form of NFκB, which translocates into the nucleus; a process that was also efficiently inhibited by the treatment with GSH-C4. Overall, the evidence suggests that GSH decrement is required for efficient activation of an inflammatory condition and, at the same time, GSH-C4 can be envisaged as a good candidate to abrogate such process, expanding the anti-inflammatory role of this molecule in chronic inflammatory states.
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Affiliation(s)
- Dolores Limongi
- Department of Human Sciences and Promotion of the Quality of Life, IRCCS San Raffaele Pisana, San Raffaele Roma Open University, Rome, Italy
| | - Sara Baldelli
- Department of Human Sciences and Promotion of the Quality of Life, IRCCS San Raffaele Pisana, San Raffaele Roma Open University, Rome, Italy
| | - Paola Checconi
- Department of Human Sciences and Promotion of the Quality of Life, IRCCS San Raffaele Pisana, San Raffaele Roma Open University, Rome, Italy
| | - Maria Elena Marcocci
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy
| | - Giovanna De Chiara
- Institute of Translational Pharmacology, National Research Council Rome, Rome, Italy
| | | | - Mauro Magnani
- University of Urbino Carlo Bo, Department of Biomolecular Sciences, Urbino, Italy
| | - Maria Rosa Ciriolo
- Department of Biology, University of Rome "Tor Vergata", Rome, Italy.,IRCCS San Raffaele Pisana, Rome, Italy
| | - Anna Teresa Palamara
- Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy.,IRCCS San Raffaele Pisana, Rome, Italy.,Institute Pasteur-Fondazione Cenci Bolognetti, Rome, Italy
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26
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Abstract
SIGNIFICANCE It is increasingly clear that proline metabolism plays an important role in metabolic reprogramming, not only in cancer but also in related fields such as aging, senescence, and development. Although first focused on proline catabolism, recent studies from a number of laboratories have emphasized the regulatory effects of proline synthesis and proline cycling. Recent Advances: Although proline dehydrogenase/proline oxidase (PRODH/POX) has been known as a tumor protein 53 (P53)-activated source of redox signaling for initiating apoptosis and autophagy, senescence has been added to the responses. On the biosynthetic side, two well-recognized oncogenes, c-MYC and phosphoinositide 3-kinase (PI3K), markedly upregulate enzymes of proline synthesis; mechanisms affected include augmented redox cycling and maintenance of pyridine nucleotides. The reprogramming has been shown to shift in clonogenesis and/or metastasis. CRITICAL ISSUES Although PRODH/POX generates reactive oxygen species (ROS) for signaling, the cellular endpoint is variable and dependent on metabolic context; the switches for these responses remain unknown. On the synthetic side, the enzymes require more complete characterization in various cancers, and demonstration of coupling of proline metabolites to other pathways may require studies of protein-protein interactions, membrane transporters, and shuttles. FUTURE DIRECTIONS The proline metabolic axis can serve as a scaffold on which a variety of regulatory mechanisms are integrated. Once understood as a central mechanism in cancer metabolism, proline metabolism may be a good target for adjunctive cancer therapy.
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Affiliation(s)
- James M Phang
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute at Frederick, NIH , Frederick, Maryland
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27
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Of mice and men: The physiological role of adipose triglyceride lipase (ATGL). Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1864:880-899. [PMID: 30367950 PMCID: PMC6439276 DOI: 10.1016/j.bbalip.2018.10.008] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 12/12/2022]
Abstract
Adipose triglyceride lipase (ATGL) has been discovered 14 years ago and revised our view on intracellular triglyceride (TG) mobilization – a process termed lipolysis. ATGL initiates the hydrolysis of TGs to release fatty acids (FAs) that are crucial energy substrates, precursors for the synthesis of membrane lipids, and ligands of nuclear receptors. Thus, ATGL is a key enzyme in whole-body energy homeostasis. In this review, we give an update on how ATGL is regulated on the transcriptional and post-transcriptional level and how this affects the enzymes' activity in the context of neutral lipid catabolism. In depth, we highlight and discuss the numerous physiological functions of ATGL in lipid and energy metabolism. Over more than a decade, different genetic mouse models lacking or overexpressing ATGL in a cell- or tissue-specific manner have been generated and characterized. Moreover, pharmacological studies became available due to the development of a specific murine ATGL inhibitor (Atglistatin®). The identification of patients with mutations in the human gene encoding ATGL and their disease spectrum has underpinned the importance of ATGL in humans. Together, mouse models and human data have advanced our understanding of the physiological role of ATGL in lipid and energy metabolism in adipose and non-adipose tissues, and of the pathophysiological consequences of ATGL dysfunction in mice and men. Summary of mouse models with genetic or pharmacological manipulation of ATGL. Summary of patients with mutations in the human gene encoding ATGL. In depth discussion of the role of ATGL in numerous physiological processes in mice and men.
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Hints on ATGL implications in cancer: beyond bioenergetic clues. Cell Death Dis 2018; 9:316. [PMID: 29472527 PMCID: PMC5833653 DOI: 10.1038/s41419-018-0345-z] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/22/2018] [Accepted: 01/23/2018] [Indexed: 12/21/2022]
Abstract
Among metabolic rearrangements occurring in cancer cells, lipid metabolism alteration has become a hallmark, aimed at sustaining accelerated proliferation. In particular, fatty acids (FAs) are dramatically required by cancer cells as signalling molecules and membrane building blocks, beyond bioenergetics. Along with de novo biosynthesis, free FAs derive from dietary sources or from intracellular lipid droplets, which represent the storage of triacylglycerols (TAGs). Adipose triglyceride lipase (ATGL) is the rate-limiting enzyme of lipolysis, catalysing the first step of intracellular TAGs hydrolysis in several tissues. However, the roles of ATGL in cancer are still neglected though a putative tumour suppressor function of ATGL has been envisaged, as its expression is frequently reduced in different human cancers (e.g., lung, muscle, and pancreas). In this review, we will introduce lipid metabolism focusing on ATGL functions and regulation in normal cell physiology providing also speculative perspectives on potential non-energetic functions of ATGL in cancer. In particular, we will discuss how ATGL is implicated, mainly through the peroxisome proliferator-activated receptor-α (PPAR-α) signalling, in inflammation, redox homoeostasis and autophagy, which are well-known processes deregulated during cancer formation and/or progression.
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Adipose triglyceride lipase decrement affects skeletal muscle homeostasis during aging through FAs-PPARα-PGC-1α antioxidant response. Oncotarget 2018; 7:23019-32. [PMID: 27056902 PMCID: PMC5029607 DOI: 10.18632/oncotarget.8552] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 03/28/2016] [Indexed: 12/25/2022] Open
Abstract
During aging skeletal muscle shows an accumulation of oxidative damage as well as intramyocellular lipid droplets (IMLDs). However, although the impact of these modifications on muscle tissue physiology is well established, the direct effectors critical for their occurrence are poorly understood. Here we show that during aging the main lipase of triacylglycerols, ATGL, significantly declines in gastrocnemius and its downregulation in C2C12 myoblast leads to the accumulation of lipid droplets. Indeed, we observed an increase of oxidative damage to proteins in terms of carbonylation, S-nitrosylation and ubiquitination that is dependent on a defective antioxidant cell response mediated by ATGL-PPARα-PGC-1α. Overall our findings describe a pivotal role for ATGL in the antioxidant/anti-inflammatory response of muscle cells highlighting this lipase as a therapeutic target for fighting the progressive decline in skeletal muscle mass and strength.
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30
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Tang H, Pang S. Proline Catabolism Modulates Innate Immunity in Caenorhabditis elegans. Cell Rep 2017; 17:2837-2844. [PMID: 27974198 DOI: 10.1016/j.celrep.2016.11.038] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 09/28/2016] [Accepted: 11/10/2016] [Indexed: 11/16/2022] Open
Abstract
Metabolic pathways are regulated to fuel or instruct the immune responses to pathogen threats. However, the regulatory roles for amino acid metabolism in innate immune responses remains poorly understood. Here, we report that mitochondrial proline catabolism modulates innate immunity in Caenorhabditis elegans. Modulation of proline catabolic enzymes affects host susceptibility to bacterial pathogen Pseudomonas aeruginosa. Mechanistically, proline catabolism governs reactive oxygen species (ROS) homeostasis and subsequent activation of SKN-1, a critical transcription factor regulating xenobiotic stress response and pathogen defense. Intriguingly, proline catabolism-mediated activation of SKN-1 requires cell-membrane dual-oxidase Ce-Duox1/BLI-3, highlighting the importance of interaction between mitochondrial and cell-membrane components in host defense. Our findings reveal how animals utilize metabolism of a single amino acid to defend against a pathogen and identify proline catabolism as a component of innate immune signaling.
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Affiliation(s)
- Haiqing Tang
- School of Life Sciences, Chongqing University, Chongqing 401331, China.
| | - Shanshan Pang
- School of Life Sciences, Chongqing University, Chongqing 401331, China.
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31
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Tian Y, Du W, Cao S, Wu Y, Dong N, Wang Y, Xu Y. Systematic analyses of glutamine and glutamate metabolisms across different cancer types. CHINESE JOURNAL OF CANCER 2017; 36:88. [PMID: 29116024 PMCID: PMC5678792 DOI: 10.1186/s40880-017-0255-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 10/26/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND Glutamine and glutamate are known to play important roles in cancer biology. However, no detailed information is available in terms of their levels of involvement in various biological processes across different cancer types, whereas such knowledge could be critical for understanding the distinct characteristics of different cancer types. Our computational study aimed to examine the functional roles of glutamine and glutamate across different cancer types. METHODS We conducted a comparative analysis of gene expression data of cancer tissues versus normal control tissues of 11 cancer types to understand glutamine and glutamate metabolisms in cancer. Specifically, we developed a linear regression model to assess differential contributions by glutamine and/or glutamate to each of seven biological processes in cancer versus control tissues. RESULTS While our computational predictions were consistent with some of the previous observations, multiple novel predictions were made: (1) glutamine is generally not involved in purine synthesis in cancer except for breast cancer, and is similarly not involved in pyridine synthesis except for kidney cancer; (2) glutamine is generally not involved in ATP production in cancer; (3) glutamine's contribution to nucleotide synthesis is minimal if any in cancer; (4) glutamine is not involved in asparagine synthesis in cancer except for bladder and lung cancers; and (5) glutamate does not contribute to serine synthesis except for bladder cancer. CONCLUSIONS We comprehensively predicted the roles of glutamine and glutamate metabolisms in selected metabolic pathways in cancer tissues versus control tissues, which may lead to novel approaches to therapeutic development targeted at glutamine and/or glutamate metabolism. However, our predictions need further functional validation.
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Affiliation(s)
- Yuan Tian
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
| | - Wei Du
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Sha Cao
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Yue Wu
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Ning Dong
- The First Hospital, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
| | - Yan Wang
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
| | - Ying Xu
- College of Computer Science and Technology, Jilin University, Changchun, 130012 Jilin P. R. China
- College of Public Health, Jilin University, Changchun, 130012 Jilin P. R. China
- Computational Systems Biology Lab, Department of Biochemistry and Molecular Biology and Institute of Bioinformatics, University of Georgia, 120 E Green St, Athens, GA 30602 USA
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32
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Lettieri-Barbato D, D'Angelo F, Sciarretta F, Tatulli G, Tortolici F, Ciriolo MR, Aquilano K. Maternal high calorie diet induces mitochondrial dysfunction and senescence phenotype in subcutaneous fat of newborn mice. Oncotarget 2017; 8:83407-83418. [PMID: 29137352 PMCID: PMC5663524 DOI: 10.18632/oncotarget.19948] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 07/26/2017] [Indexed: 12/25/2022] Open
Abstract
Mitochondrial dysfunction, inflammation and senescence-like features are observed in adipose depots in aging and obesity. Herein, we evaluated how maternal high calorie diet (HCD) may impact on subcutaneous adipose tissue (sAT) of the newborn mice. Adult C57BL/6J mice were randomly divided in three groups: normal calorie diet (NCD), HCD and HCD supplemented with niacin 8 weeks before mating. Mothers and pups were then sacrificed and metabolic and molecular analyses were carried out on sAT. HCD induced mitochondria dysfunction in mothers without inflammation and senescence, whereas in pups we also revealed the occurrence of senescent phenotype. The mitochondrial dysfunction-associated senescence in pups was accompanied by a drop in NAD+/NADH ratio and alteration in the NAD+-dependent enzymes PARP1 and SIRT1. Importantly, maternal dietary supplementation with niacin during gestation and lactation restrained NAD+/NADH decrease imposed by HCD limiting inflammatory cytokine production and senescence phenotype in newborn sAT. Given the fundamental role of sAT in buffering nutrient overload and avoiding pathogenic ectopic fat accumulation, we suggest that NAD+ boosting strategies during maternal HCD could be helpful in limiting sAT dysfunction in newborn.
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Affiliation(s)
- Daniele Lettieri-Barbato
- Department of Biology, University of Rome Tor Vergata, Rome, Italy.,IRCCS San Raffaele Pisana, Rome, Italy
| | - Fabiana D'Angelo
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | | | | | - Flavia Tortolici
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Maria Rosa Ciriolo
- Department of Biology, University of Rome Tor Vergata, Rome, Italy.,IRCCS San Raffaele Pisana, Rome, Italy
| | - Katia Aquilano
- Department of Biology, University of Rome Tor Vergata, Rome, Italy.,IRCCS San Raffaele Pisana, Rome, Italy
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Li Y, Ma Z, Jiang S, Hu W, Li T, Di S, Wang D, Yang Y. A global perspective on FOXO1 in lipid metabolism and lipid-related diseases. Prog Lipid Res 2017; 66:42-49. [PMID: 28392404 DOI: 10.1016/j.plipres.2017.04.002] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 03/29/2017] [Accepted: 04/05/2017] [Indexed: 02/07/2023]
Abstract
Lipid metabolism is a complex physiological process that is involved in nutrient adjustment, hormone regulation, and homeostasis. An unhealthy lifestyle and chronic nutrient overload can cause lipid metabolism disorders, which may lead to serious lipid-related diseases, including obesity, non-alcoholic fatty liver disease (NAFLD), and type 2 diabetes mellitus (T2DM). Therefore, tools for preventing dysfunctional lipid metabolism are urgently needed. The transcription factor forkhead box protein O1 (FOXO1) is involved in lipid metabolism and plays a critical role in the development of lipid-related diseases. In this review, we provide a global perspective on the role of FOXO1 in lipid metabolism and lipid-related diseases. The information included here may be useful for the design of future studies and advancing investigations of FOXO1 as a therapeutic target.
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Affiliation(s)
- Yue Li
- Department of Thoracic and Cardiovascular Surgery, Affiliated Drum Tower Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing 210008, Jiangsu, China; Department of Biomedical Engineering, The Fourth Military Medical University, 169 Changle West Road, Xi'an 710032, China
| | - Zhiqiang Ma
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, 1 Xinsi Road, Xi'an 710038, China
| | - Shuai Jiang
- Department of Aerospace Medicine, The Fourth Military Medical University, 169 Changle West Road, Xi'an 710032, China
| | - Wei Hu
- Department of Biomedical Engineering, The Fourth Military Medical University, 169 Changle West Road, Xi'an 710032, China
| | - Tian Li
- Department of Biomedical Engineering, The Fourth Military Medical University, 169 Changle West Road, Xi'an 710032, China
| | - Shouyin Di
- Department of Thoracic Surgery, Tangdu Hospital, The Fourth Military Medical University, 1 Xinsi Road, Xi'an 710038, China
| | - Dongjin Wang
- Department of Thoracic and Cardiovascular Surgery, Affiliated Drum Tower Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing 210008, Jiangsu, China.
| | - Yang Yang
- Department of Thoracic and Cardiovascular Surgery, Affiliated Drum Tower Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing 210008, Jiangsu, China; Department of Biomedical Engineering, The Fourth Military Medical University, 169 Changle West Road, Xi'an 710032, China.
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Chen W, Jiang Y, Han J, Hu J, He T, Yan T, Huang N, Zhang Q, Mei H, Liao Y, Huang Y, Chen B. Atgl deficiency induces podocyte apoptosis and leads to glomerular filtration barrier damage. FEBS J 2017; 284:1070-1081. [PMID: 28194887 DOI: 10.1111/febs.14038] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 01/16/2017] [Accepted: 02/10/2017] [Indexed: 12/31/2022]
Abstract
Abnormal lipid metabolism, renal lipid accumulation and lipotoxicity are associated with the pathological features of glomerulopathy. However, the mechanisms by which lipid accumulation leads to the development or progression of this disease have not been fully elucidated. In this work, we have identified a role for the rate-limiting enzyme in lipolysis, adipose triglyceride lipase (ATGL; also called patatin-like phospholipase domain-containing protein 2), in renal lipid metabolism and kidney disease. ATGL-deficient (Atgl(-/-)) mice displayed albuminuria, accompanied by ectopic deposition of fat in the kidney. Magnetic resonance imaging demonstrated that the contrast agent gadopentetic acid was retained in kidney tissue, suggesting defects in the glomerular filtration barrier. Furthermore, transmission electron microscopy revealed lipid deposits in the podocyte, along with foot process fusion and morphological changes suggestive of apoptosis. Indeed, shRNA-mediated depletion of ATGL promoted podocyte apoptosis, accompanied by increased levels of intracellular reactive oxygen species (ROS) and F-actin fibre redistribution. These effects could be partially reversed by treatment with the antioxidant N-acetylcysteine. These data suggest that ATGL deficiency induces renal lipid accumulation, proteinuria and glomerular filtration barrier dysfunction and implicate increased intracellular ROS levels in inducing podocyte F-actin rearrangement, foot process fusion and apoptosis that underlie these pathological features. ENZYMES Adipose triglyceride lipase, EC3.1.1.3.
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Affiliation(s)
- Wen Chen
- Department of Endocrinology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Youzhao Jiang
- Department of Endocrinology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Jian Han
- Department of Gynaecology and Obstetrics, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jiongyu Hu
- Department of Endocrinology, Southwest Hospital, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
| | - Ting He
- Department of Burns and Plastic Surgery, the General Hospital of the Chinese People's Armed Police Forces, Beijing, China
| | - Tiantian Yan
- Institute of Burn Research, Southwest Hospital, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
| | - Na Huang
- Department of Endocrinology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Qiong Zhang
- Institute of Burn Research, Southwest Hospital, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
| | - Hao Mei
- Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, CT, USA
| | - Yong Liao
- Department of Endocrinology, 169th Hospital of PLA, Hengyang, Hunan, China
| | - Yuesheng Huang
- Institute of Burn Research, Southwest Hospital, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
| | - Bing Chen
- Department of Endocrinology, Southwest Hospital, Third Military Medical University, Chongqing, China
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Roy D, Mondal S, Khurana A, Jung DB, Hoffmann R, He X, Kalogera E, Dierks T, Hammond E, Dredge K, Shridhar V. Loss of HSulf-1: The Missing Link between Autophagy and Lipid Droplets in Ovarian Cancer. Sci Rep 2017; 7:41977. [PMID: 28169314 PMCID: PMC5294412 DOI: 10.1038/srep41977] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 12/28/2016] [Indexed: 12/13/2022] Open
Abstract
Defective autophagy and deranged metabolic pathways are common in cancer; pharmacologic targeting of these two pathways could provide a viable therapeutic option. However, how these pathways are regulated by limited availability of growth factors is still unknown. Our study shows that HSulf-1 (endosulfatase), a known tumor suppressor which attenuates heparin sulfate binding growth factor signaling, also regulates interplay between autophagy and lipogenesis. Silencing of HSulf-1 in OV202 and TOV2223 cells (ovarian cancer cell lines) resulted in increased lipid droplets (LDs), reduced autophagic vacuoles (AVs) and less LC3B puncta. In contrast, HSulf-1 proficient cells exhibit more AVs and reduced LDs. Increased LDs in HSulf-1 depleted cells was associated with increased ERK mediated cPLA2S505 phosphorylation. Conversely, HSulf-1 expression in SKOV3 cells reduced the number of LDs and increased the number of AVs compared to vector controls. Furthermore, pharmacological (AACOCF3) and ShRNA mediated downregulation of cPLA2 resulted in reduced LDs, and increased autophagy. Finally, in vivo experiment using OV202 Sh1 derived xenograft show that AACOCF3 treatment effectively attenuated tumor growth and LD biogenesis. Collectively, these results show a reciprocal regulation of autophagy and lipid biogenesis by HSulf-1 in ovarian cancer.
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Affiliation(s)
- Debarshi Roy
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | - Susmita Mondal
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | - Ashwani Khurana
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | - Deok-Beom Jung
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | - Robert Hoffmann
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | - Xiaoping He
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
| | | | - Thomas Dierks
- Department of Chemistry, Biochemistry I, Bielefeld University, Bielefeld, Germany
| | | | - Keith Dredge
- Zucero Therapeutics. Brisbane, Queensland, Australia
| | - Viji Shridhar
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, USA
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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.
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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
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37
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Lettieri Barbato D, Tatulli G, Aquilano K, Ciriolo MR. Mitochondrial Hormesis links nutrient restriction to improved metabolism in fat cell. Aging (Albany NY) 2016; 7:869-81. [PMID: 26540513 PMCID: PMC4637211 DOI: 10.18632/aging.100832] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Fasting promotes longevity by reprogramming metabolic and stress resistance pathways. However, although the impact on adipose tissue physiology through hormonal inputs is well established, the direct role of fasting on adipose cells is poorly understood. Herein we show that white and beige adipocytes, as well as mouse epididymal and subcutaneous adipose depots, respond to nutrient scarcity by acquiring a brown-like phenotype. Indeed, they improve oxidative metabolism through modulating the expression of mitochondrial-and nuclear-encoded oxidative phosphorylation genes as well as mitochondrial stress defensive proteins (UCP1, SOD2). Such adaptation is placed in a canonical mitohormetic response that proceeds via mitochondrial reactive oxygen species (mtROS) production and redistribution of FoxO1 transcription factor into nucleus. Nuclear FoxO1 (nFoxO1) mediates retrograde communication by inducing the expression of mitochondrial oxidative and stress defensive genes. Collectively, our findings describe an unusual white/beige fat cell response to nutrient availability highlighting another health-promoting mechanism of fasting.
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Affiliation(s)
| | | | - Katia Aquilano
- Department of Biology, University of Rome "Tor Vergata", 00133 Rome, Italy.,IRCCS San Raffaele Roma, 00163 Rome, Italy
| | - Maria R Ciriolo
- Department of Biology, University of Rome "Tor Vergata", 00133 Rome, Italy
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38
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Shih SC, Ho TC, Chen SL, Tsao YP. Pigment Epithelium Derived Factor Peptide Protects Murine Hepatocytes from Carbon Tetrachloride-Induced Injury. PLoS One 2016; 11:e0157647. [PMID: 27384427 PMCID: PMC4934881 DOI: 10.1371/journal.pone.0157647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 06/02/2016] [Indexed: 12/31/2022] Open
Abstract
Fibrogenesis is induced by repeated injury to the liver and reactive regeneration and leads eventually to liver cirrhosis. Pigment epithelium derived factor (PEDF) has been shown to prevent liver fibrosis induced by carbon tetrachloride (CCl4). A 44 amino acid domain of PEDF (44-mer) was found to have a protective effect against various insults to several cell types. In this study, we investigated the capability of synthetic 44-mer to protect against liver injury in mice and in primary cultured hepatocytes. Acute liver injury, induced by CCl4, was evident from histological changes, such as cell necrosis, inflammation and apoptosis, and a concomitant reduction of glutathione (GSH) and GSH redox enzyme activities in the liver. Intraperitoneal injection of the 44-mer into CCl4-treated mice abolished the induction of AST and ALT and markedly reduced histological signs of liver injury. The 44-mer treatment can reduce hepatic oxidative stress as evident from lower levels of lipid hydroperoxide, and higher levels of GSH. CCl4 caused a reduction of Bcl-xL, PEDF and PPARγ, which was markedly restored by the 44-mer treatment. Consequently, the 44-mer suppressed liver fibrosis induced by repeated CCl4 injury. Furthermore, our observations in primary culture of rat hepatocytes showed that PEDF and the 44-mer protected primary rat hepatocytes against apoptosis induced by serum deprivation and TGF-β1. PEDF/44-mer induced cell protective STAT3 phosphorylation. Pharmacological STAT3 inhibition prevented the antiapoptotic action of PEDF/44-mer. Among several PEDF receptor candidates that may be responsible for hepatocyte protection, we demonstrated that PNPLA2 was essential for PEDF/44-mer-mediated STAT3 phosphorylation and antiapoptotic activity by using siRNA to selectively knockdown PNPLA2. In conclusion, the PEDF 44-mer protects hepatocytes from single and repeated CCl4 injury. This protective effect may stem from strengthening the counter oxidative stress capacity and induction of hepatoprotective factors.
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Affiliation(s)
- Shou-Chuan Shih
- Mackay Medical College, New Taipei City, Taiwan
- Department of Internal Medicine, Mackay Memorial Hospital, Taipei, Taiwan
- * E-mail: (SCS); (YPT)
| | - Tsung-Chuan Ho
- Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan
| | - Show-Li Chen
- Department of Microbiology, School of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yeou-Ping Tsao
- Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan
- Department of Ophthalmology, Mackay Memorial Hospital, Taipei, Taiwan
- * E-mail: (SCS); (YPT)
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39
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Lettieri Barbato D, Aquilano K. Feast and famine: Adipose tissue adaptations for healthy aging. Ageing Res Rev 2016; 28:85-93. [PMID: 27223996 DOI: 10.1016/j.arr.2016.05.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/16/2016] [Accepted: 05/16/2016] [Indexed: 12/18/2022]
Abstract
Proper adipose tissue function controls energy balance with favourable effects on metabolic health and longevity. The molecular and metabolic asset of adipose tissue quickly and dynamically readapts in response to nutrient fluctuations. Once delivered into cells, nutrients are managed by mitochondria that represent a key bioenergetics node. A persistent nutrient overload generates mitochondrial exhaustion and uncontrolled reactive oxygen species ((mt)ROS) production. In adipocytes, metabolic/molecular reorganization is triggered culminating in the acquirement of a hypertrophic and hypersecretory phenotype that accelerates aging. Conversely, dietary regimens such as caloric restriction or time-controlled fasting endorse mitochondrial functionality and (mt)ROS-mediated signalling, thus promoting geroprotection. In this perspective view, we argued some important molecular and metabolic aspects related to adipocyte response to nutrient stress. Finally we delineated hypothetical routes by which molecularly and metabolically readapted adipose tissue promotes healthy aging.
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40
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Liisberg U, Myrmel LS, Fjære E, Rønnevik AK, Bjelland S, Fauske KR, Holm JB, Basse AL, Hansen JB, Liaset B, Kristiansen K, Madsen L. The protein source determines the potential of high protein diets to attenuate obesity development in C57BL/6J mice. Adipocyte 2016; 5:196-211. [PMID: 27386160 DOI: 10.1080/21623945.2015.1122855] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 10/28/2015] [Accepted: 11/12/2015] [Indexed: 10/22/2022] Open
Abstract
The notion that the obesogenic potential of high fat diets in rodents is attenuated when the protein:carbohydrate ratio is increased is largely based on studies using casein or whey as the protein source. We fed C57BL/6J mice high fat-high protein diets using casein, soy, cod, beef, chicken or pork as protein sources. Casein stood out as the most efficient in preventing weight gain and accretion of adipose mass. By contrast, mice fed diets based on pork or chicken, and to a lesser extent mice fed cod or beef protein, had increased adipose tissue mass gain relative to casein fed mice. Decreasing the protein:carbohydrate ratio in diets with casein or pork as protein sources led to accentuated fat mass accumulation. Pork fed mice were more obese than casein fed mice, and relative to casein, the pork-based feed induced substantial accumulation of fat in classic interscapular brown adipose tissue accompanied by decreased UCP1 expression. Furthermore, intake of a low fat diet with casein, but not pork, as a protein source reversed diet-induced obesity. Compared to pork, casein seems unique in maintaining the classical brown morphology in interscapular brown adipose tissue with high UCP1 expression. This was accompanied by increased expression of genes involved in a futile cycling of fatty acids. Our results demonstrate that intake of high protein diets based on other protein sources may not have similar effects, and hence, the obesity protective effect of high protein diets is clearly modulated by protein source.
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Affiliation(s)
- Ulrike Liisberg
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Lene Secher Myrmel
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Even Fjære
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Alexander K. Rønnevik
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Susanne Bjelland
- National Institute of Nutrition and Seafood Research, Bergen, Norway
| | | | - Jacob Bak Holm
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | | | - Jacob B. Hansen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Bjørn Liaset
- National Institute of Nutrition and Seafood Research, Bergen, Norway
| | | | - Lise Madsen
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
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41
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Park CE. Comparison of the Usefulness of Diagnostic Tests for Rheumatoid Arthritis. KOREAN JOURNAL OF CLINICAL LABORATORY SCIENCE 2015. [DOI: 10.15324/kjcls.2015.47.4.168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Chang-Eun Park
- Deptartment Biomedical Laboratory Science, Namseoul University, Cheonan 31020, Korea
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42
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Hancock CN, Liu W, Alvord WG, Phang JM. Co-regulation of mitochondrial respiration by proline dehydrogenase/oxidase and succinate. Amino Acids 2015; 48:859-872. [PMID: 26660760 PMCID: PMC4752965 DOI: 10.1007/s00726-015-2134-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 11/05/2015] [Indexed: 02/03/2023]
Abstract
Proline dehydrogenase/oxidase (PRODH/POX) is a mitochondrial protein critical to multiple stress pathways. Because of the roles of PRODH/POX in signaling, and its shared localization to the mitochondrial inner membrane with the electron transport chain (ETC), we investigated whether there was a direct relationship between PRODH/POX and regulation of the ETC. We found that PRODH/POX binds directly to CoQ1 and that CoQ1-dependent PRODH/POX activity required functional Complex III and Complex IV. PRODH/POX supported respiration in living cells during nutrient stress; however, expression of PRODH/POX resulted in an overall decrease in respiratory fitness. Effects on respiratory fitness were inhibited by DHP and NAC, indicating that these effects were mediated by PRODH/POX-dependent reactive oxygen species (ROS) generation. PRODH/POX expression resulted in a dose-dependent down-regulation of Complexes I–IV of the ETC, and this effect was also mitigated by the addition of DHP and NAC. We found that succinate was an uncompetitive inhibitor of PRODH/POX activity, inhibited ROS generation by PRODH/POX, and alleviated PRODH/POX effects on respiratory fitness. The findings demonstrate novel cross-talk between proline and succinate respiration in vivo and provide mechanistic insights into observations from previous animal studies. Our results suggest a potential regulatory loop between PRODH/POX and succinate in regulation of mitochondrial respiration.
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Affiliation(s)
- Chad N Hancock
- Metabolism and Cancer Susceptibility Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, NCI-Frederick, 1050 Boyles Street, Bldg. 538, Rm. 144, Frederick, MD, 21702-1201, USA.
| | - Wei Liu
- Metabolism and Cancer Susceptibility Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, NCI-Frederick, 1050 Boyles Street, Bldg. 538, Rm. 144, Frederick, MD, 21702-1201, USA
| | - W Gregory Alvord
- Data Management Services, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
| | - James M Phang
- Metabolism and Cancer Susceptibility Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, NCI-Frederick, 1050 Boyles Street, Bldg. 538, Rm. 144, Frederick, MD, 21702-1201, USA.
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43
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Schoiswohl G, Stefanovic-Racic M, Menke MN, Wills RC, Surlow BA, Basantani MK, Sitnick MT, Cai L, Yazbeck CF, Stolz DB, Pulinilkunnil T, O'Doherty RM, Kershaw EE. Impact of Reduced ATGL-Mediated Adipocyte Lipolysis on Obesity-Associated Insulin Resistance and Inflammation in Male Mice. Endocrinology 2015; 156. [PMID: 26196542 PMCID: PMC4588821 DOI: 10.1210/en.2015-1322] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Emerging evidence suggests that impaired regulation of adipocyte lipolysis contributes to the proinflammatory immune cell infiltration of metabolic tissues in obesity, a process that is proposed to contribute to the development and exacerbation of insulin resistance. To test this hypothesis in vivo, we generated mice with adipocyte-specific deletion of adipose triglyceride lipase (ATGL), the rate-limiting enzyme catalyzing triacylglycerol hydrolysis. In contrast to previous models, adiponectin-driven Cre expression was used for targeted ATGL deletion. The resulting adipocyte-specific ATGL knockout (AAKO) mice were then characterized for metabolic and immune phenotypes. Lean and diet-induced obese AAKO mice had reduced adipocyte lipolysis, serum lipids, systemic lipid oxidation, and expression of peroxisome proliferator-activated receptor alpha target genes in adipose tissue (AT) and liver. These changes did not increase overall body weight or fat mass in AAKO mice by 24 weeks of age, in part due to reduced expression of genes involved in lipid uptake, synthesis, and adipogenesis. Systemic glucose and insulin tolerance were improved in AAKO mice, primarily due to enhanced hepatic insulin signaling, which was accompanied by marked reduction in diet-induced hepatic steatosis as well as hepatic immune cell infiltration and activation. In contrast, although adipocyte ATGL deletion reduced AT immune cell infiltration in response to an acute lipolytic stimulus, it was not sufficient to ameliorate, and may even exacerbate, chronic inflammatory changes that occur in AT in response to diet-induced obesity.
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Affiliation(s)
- Gabriele Schoiswohl
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Maja Stefanovic-Racic
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Marie N Menke
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Rachel C Wills
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Beth A Surlow
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Mahesh K Basantani
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Mitch T Sitnick
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Lingzhi Cai
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Cynthia F Yazbeck
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Donna B Stolz
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Thomas Pulinilkunnil
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Robert M O'Doherty
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Erin E Kershaw
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
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Lettieri Barbato D, Tatulli G, Vegliante R, Cannata SM, Bernardini S, Ciriolo MR, Aquilano K. Dietary fat overload reprograms brown fat mitochondria. Front Physiol 2015; 6:272. [PMID: 26483700 PMCID: PMC4586425 DOI: 10.3389/fphys.2015.00272] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 09/14/2015] [Indexed: 12/18/2022] Open
Abstract
Chronic nutrient overload accelerates the onset of several aging-related diseases reducing life expectancy. Although the mechanisms by which overnutrition affects metabolic processes in many tissues are known, its role on BAT physiology is still unclear. Herein, we investigated the mitochondrial responses in BAT of female mice exposed to high fat diet (HFD) at different steps of life. Although adult mice showed an unchanged mitochondrial amount, both respiration and OxPHOS subunits were strongly affected. Differently, offspring pups exposed to HFD during pregnancy and lactation displayed reduced mitochondrial mass but high oxidative efficiency that, however, resulted in increased bioenergetics state of BAT rather than augmented uncoupling respiration. Interestingly, the metabolic responses triggered by HFD were accompanied by changes in mitochondrial dynamics characterized by decreased content of the fragmentation marker Drp1 both in mothers and offspring pups. HFD-induced inactivation of the FoxO1 transcription factor seemed to be the up-stream modulator of Drp1 levels in brown fat cells. Furthermore, HFD offspring pups weaned with normal diet only partially reverted the mitochondrial dysfunctions caused by HFD. Finally these mice failed in activating the thermogenic program upon cold exposure. Collectively our findings suggest that maternal dietary fat overload irreversibly commits BAT unresponsiveness to physiological stimuli such as cool temperature and this dysfunction in the early stage of life might negatively modulate health and lifespan.
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Affiliation(s)
| | | | - Rolando Vegliante
- Department of Biology, University of Rome "Tor Vergata," Rome, Italy
| | - Stefano M Cannata
- Department of Biology, University of Rome "Tor Vergata," Rome, Italy
| | - Sergio Bernardini
- Department of Biology, University of Rome "Tor Vergata," Rome, Italy
| | - Maria R Ciriolo
- Department of Biology, University of Rome "Tor Vergata," Rome, Italy ; IRCCS San Raffaele Roma Rome, Italy
| | - Katia Aquilano
- Department of Biology, University of Rome "Tor Vergata," Rome, Italy ; IRCCS San Raffaele Roma Rome, Italy
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The interplay between inflammation and metabolism in rheumatoid arthritis. Cell Death Dis 2015; 6:e1887. [PMID: 26379192 PMCID: PMC4650442 DOI: 10.1038/cddis.2015.246] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Accepted: 07/29/2015] [Indexed: 12/29/2022]
Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by extensive synovitis resulting in erosions of articular cartilage and marginal bone that lead to joint destruction. The autoimmune process in RA depends on the activation of immune cells, which use intracellular kinases to respond to external stimuli such as cytokines, immune complexes, and antigens. An intricate cytokine network participates in inflammation and in perpetuation of disease by positive feedback loops promoting systemic disorder. The widespread systemic effects mediated by pro-inflammatory cytokines in RA impact on metabolism and in particular in lymphocyte metabolism. Moreover, RA pathobiology seems to share some common pathways with atherosclerosis, including endothelial dysfunction that is related to underlying chronic inflammation. The extent of the metabolic changes and the types of metabolites seen may be good markers of cytokine-mediated inflammatory processes in RA. Altered metabolic fingerprints may be useful in predicting the development of RA in patients with early arthritis as well as in the evaluation of the treatment response. Evidence supports the role of metabolomic analysis as a novel and nontargeted approach for identifying potential biomarkers and for improving the clinical and therapeutical management of patients with chronic inflammatory diseases. Here, we review the metabolic changes occurring in the pathogenesis of RA as well as the implication of the metabolic features in the treatment response.
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Lettieri Barbato D, Tatulli G, Maria Cannata S, Bernardini S, Aquilano K, Ciriolo MR. Glutathione Decrement Drives Thermogenic Program In Adipose Cells. Sci Rep 2015; 5:13091. [PMID: 26260892 PMCID: PMC4531326 DOI: 10.1038/srep13091] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 07/17/2015] [Indexed: 01/21/2023] Open
Abstract
Adipose tissue metabolically adapts to external stimuli. We demonstrate that the induction of the thermogenic program in white adipocytes, through cold exposure in mice or in vitro adrenergic stimulation, is accompanied by a decrease in the intracellular content of glutathione (GSH). Moreover, the treatment with a GSH depleting agent, buthionine sulfoximine (BSO), recapitulates the effect of cold exposure resulting in the induction of thermogenic program. In particular, BSO treatment leads to enhanced uncoupling respiration as demonstrated by increased expression of thermogenic genes (e.g. Ucp1, Ppargc1a), augmented oxygen consumption and decreased mitochondrial transmembrane potential. Buffering GSH decrement by pre-treatment with GSH ester prevents the up-regulation of typical markers of uncoupling respiration. We demonstrate that FoxO1 activation is responsible for the conversion of white adipocytes into a brown phenotype as the “browning” effects of BSO are completely abrogated in cells down-regulating FoxO1. In mice, the BSO-mediated up-regulation of uncoupling genes results in weight loss that is at least in part ascribed to adipose tissue mass reduction. The induction of thermogenic program has been largely proposed to counteract obesity-related diseases. Based on these findings, we propose GSH as a novel therapeutic target to increase energy expenditure in adipocytes.
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Affiliation(s)
- Daniele Lettieri Barbato
- Dept. Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Giuseppe Tatulli
- Scientific Institute for Research Hospitalization and Health Care and Università Telematica San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy
| | - Stefano Maria Cannata
- Dept. Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Sergio Bernardini
- Dept. Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Katia Aquilano
- 1] Dept. Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome, Italy [2] Scientific Institute for Research Hospitalization and Health Care and Università Telematica San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy
| | - Maria R Ciriolo
- 1] Dept. Biology, University of Rome "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome, Italy [2] Scientific Institute for Research Hospitalization and Health Care and Università Telematica San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy
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Aquilano K, Lettieri Barbato D, Rosa CM. The multifaceted role of nitric oxide synthases in mitochondrial biogenesis and cell differentiation. Commun Integr Biol 2015; 8:e1017158. [PMID: 26479127 PMCID: PMC4594549 DOI: 10.1080/19420889.2015.1017158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 12/04/2014] [Indexed: 10/25/2022] Open
Abstract
Nitric oxide (NO) is physiologically synthetized by a family of enzymes called NO synthases (NOSs). NO is a pleiotropic second messenger having a fundamental role in several cellular processes including cell differentiation. Being a high reactive molecule, NO must be synthetized in close proximity to the effector/target. For this reason, the subcellular localization of NOSs is tightly regulated by different post-translation mechanisms. Recently, in murine C2C12 myoblasts, we have demonstrated that mitochondrial biogenesis, an essential event for cell differentiation, can be effective only if the site of NO production is located at nuclear level, where NO favors the CREB-dependent expression of PGC-1α gene. The increase of NO flux in nuclei is elicited by the up-regulation and redistribution of neuronal NOS (nNOS) toward nuclei. Herein we show that an upregulation of endothelial NOS (eNOS) occurs during adipocyte differentiation in 3T3-L1 cells. However, differently to differentiating myocytes, a concomitant redistribution of eNOS toward nuclei was not detected. We also observed that, upon treatment with the NO synthesis inhibitor L-NAME, mitochondrial biogenesis as well as triglyceride accumulation that normally occurs during adipogenesis were not impeded. The absence of eNOS in nuclei together with the ineffectiveness of L-NAME suggest that, at least during 3T3-L1 differentiation, NO is not fundamental for the induction of mitochondrial biogenesis and adipogenesis.
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Affiliation(s)
- Katia Aquilano
- Department of Biology; University of Rome "Tor Vergata" ; Rome, Italy ; IRCCS San Raffaele ; Rome, Italy
| | | | - Ciriolo Maria Rosa
- Department of Biology; University of Rome "Tor Vergata" ; Rome, Italy ; IRCCS San Raffaele ; Rome, Italy
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A novel autoregulatory loop between the Gcn2-Atf4 pathway and (L)-Proline [corrected] metabolism controls stem cell identity. Cell Death Differ 2015; 22:1094-105. [PMID: 25857264 PMCID: PMC4572871 DOI: 10.1038/cdd.2015.24] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 02/07/2015] [Accepted: 02/16/2015] [Indexed: 12/23/2022] Open
Abstract
Increasing evidence indicates that metabolism is implicated in the control of stem cell identity. Here, we demonstrate that embryonic stem cell (ESC) behaviour relies on a feedback loop that involves the non-essential amino acid L-Proline (L-Pro) in the modulation of the Gcn2-Eif2α-Atf4 amino acid starvation response (AAR) pathway that in turn regulates L-Pro biosynthesis. This regulatory loop generates a highly specific intrinsic shortage of L-Pro that restricts proliferation of tightly packed domed-like ESC colonies and safeguards ESC identity. Indeed, alleviation of this nutrient stress condition by exogenously provided L-Pro induces proliferation and modifies the ESC phenotypic and molecular identity towards that of mesenchymal-like, invasive pluripotent stem cells. Either pharmacological inhibition of the prolyl-tRNA synthetase by halofuginone or forced expression of Atf4 antagonises the effects of exogenous L-Pro. Our data provide unprecedented evidence that L-Pro metabolism and the nutrient stress response are functionally integrated to maintain ESC identity.
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Wang Y, Zhang Y, Zhu Y, Zhang P. Lipolytic inhibitor G0/G1 switch gene 2 inhibits reactive oxygen species production and apoptosis in endothelial cells. Am J Physiol Cell Physiol 2015; 308:C496-504. [PMID: 25588877 DOI: 10.1152/ajpcell.00317.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
G0/G1 switch gene 2 (G0S2), a novel target gene of peroxisome proliferator-activated receptor, is highly expressed in fat tissues. G0S2 acts as proapoptotic factor toward human cancer cells. Endothelial cell (EC) apoptosis may be an initiating event in the development of atherosclerosis. However, the expression and function of G0S2 in vascular ECs remain unknown. Here, we reported for the first time that G0S2 is expressed in arterial ECs. Ectopic expression of G0S2 increased neutral lipid accumulation in cultured ECs. However, G0S2 prevented ECs from serum-free starvation stress- and hydrogen peroxide (H2O2)-induced apoptosis. G0S2 blocked the H2O2-induced dissipation of mitochondrial membrane potential. G0S2 decreased the release of cytochrome c from mitochondria into the cytosol, followed by activation of caspase-9 and caspase-3. The anti-apoptotic effect of G0S2 was Bcl-2 and adipose triglyceride lipase independent. In contrast, gene silence of G0S2 increased serum-free starvation stress-induced EC apoptosis and decreased the formation of capillary-like structures. We further found that G0S2 couples with the F0F1-ATP synthase in ECs. Levels of ATP were elevated, whereas reactive oxygen species levels were reduced in G0S2-expressing ECs. G0S2 can inhibit endothelial denudation secondary to H2O2-induced injury to ECs in vivo. These results indicate that G0S2 acts as a prosurvival molecule in ECs. Taken together, our results indicate that G0S2 has a protective function in ECs and may be a potential target for the treatment of cardiovascular diseases associated with reactive oxygen species-induced EC injury, such as atherosclerosis and restenosis.
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Affiliation(s)
- Yinfang Wang
- Department of Physiology and Pathophysiology, Fudan University Shanghai Medical College, Shanghai, China
| | - Yahui Zhang
- Department of Pathophysiology, Hubei University of Medicine, Hubei, China; and
| | - Yichun Zhu
- Department of Physiology and Pathophysiology, Fudan University Shanghai Medical College, Shanghai, China
| | - Peng Zhang
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
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Abstract
PURPOSE OF REVIEW Proline metabolism impacts a number of regulatory targets in both animals and plants and is especially important in cancer. Glutamine, a related amino acid, is considered second in importance only to glucose as a substrate for tumors. But proline and glutamine are interconvertible and linked in their metabolism. In animals, proline and glutamine have specific regulatory functions and their respective physiologic sources. A comparison of the metabolism of proline and glutamine would help us understand the importance of these two nonessential amino acids in cancer metabolism. RECENT FINDINGS The regulatory functions of proline metabolism proposed 3 decades ago have found relevance in many areas. For cancer, these functions play a role in apoptosis, autophagy and in response to nutrient and oxygen deprivation. Importantly, proline-derived reactive oxygen species served as a driving signal for reprogramming. This model has been applied by others to metabolic regulation for the insulin-prosurvival axis, induction of adipose triglyceride lipase for lipid metabolism and regulation of embryonic stem cell development. Of special interest, modulatory proteins such as parkinson protein 7 and oral cancer overexpressed 1 interact with pyrroline-5-carboxylate reductase, a critical component of the proline regulatory axis. Although the interconvertibility of proline and glutamine has been long established, recent findings showed that the proto-oncogene, cellular myelocytomatosis oncogene, upregulates glutamine utilization (glutaminase) and routes glutamate to proline biosynthesis (pyrroline-5-carboxylate synthase, pyrroline-5-carboxylate reductases). Additionally, collagen, which contains large amounts of proline, may be metabolized to serve as a reservoir for proline. This metabolic relationship as well as the new regulatory targets of proline metabolism invites an elucidation of the differential effects of these nonessential amino acids and their production, storage and mobilization. SUMMARY Mechanisms by which the proline regulatory axis modulates the cancer phenotype are being revealed. Proline can be synthesized from glutamine as well as derived from collagen degradation. The metabolism of proline serves as a source of energy during stress, provides signaling reactive oxygen species for epigenetic reprogramming and regulates redox homeostasis.
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Affiliation(s)
- James M Phang
- Metabolism and Cancer Susceptibility Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, Maryland, USA
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