1
|
He W, Liu X, Feng Y, Ding H, Sun H, Li Z, Shi B. Dietary fat supplementation relieves cold temperature-induced energy stress through AMPK-mediated mitochondrial homeostasis in pigs. J Anim Sci Biotechnol 2024; 15:56. [PMID: 38584279 PMCID: PMC11000307 DOI: 10.1186/s40104-024-01014-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/14/2024] [Indexed: 04/09/2024] Open
Abstract
BACKGROUND Cold stress has negative effects on the growth and health of mammals, and has become a factor restricting livestock development at high latitudes and on plateaus. The gut-liver axis is central to energy metabolism, and the mechanisms by which it regulates host energy metabolism at cold temperatures have rarely been illustrated. In this study, we evaluated the status of glycolipid metabolism and oxidative stress in pigs based on the gut-liver axis and propose that AMP-activated protein kinase (AMPK) is a key target for alleviating energy stress at cold temperatures by dietary fat supplementation. RESULTS Dietary fat supplementation alleviated the negative effects of cold temperatures on growth performance and digestive enzymes, while hormonal homeostasis was also restored. Moreover, cold temperature exposure increased glucose transport in the jejunum. In contrast, we observed abnormalities in lipid metabolism, which was characterized by the accumulation of bile acids in the ileum and plasma. In addition, the results of the ileal metabolomic analysis were consistent with the energy metabolism measurements in the jejunum, and dietary fat supplementation increased the activity of the mitochondrial respiratory chain and lipid metabolism. As the central nexus of energy metabolism, the state of glycolipid metabolism and oxidative stress in the liver are inconsistent with that in the small intestine. Specifically, we found that cold temperature exposure increased glucose transport in the liver, which fully validates the idea that hormones can act on the liver to regulate glucose output. Additionally, dietary fat supplementation inhibited glucose transport and glycolysis, but increased gluconeogenesis, bile acid cycling, and lipid metabolism. Sustained activation of AMPK, which an energy receptor and regulator, leads to oxidative stress and apoptosis in the liver; dietary fat supplementation alleviates energy stress by reducing AMPK phosphorylation. CONCLUSIONS Cold stress reduced the growth performance and aggravated glycolipid metabolism disorders and oxidative stress damage in pigs. Dietary fat supplementation improved growth performance and alleviated cold temperature-induced energy stress through AMPK-mediated mitochondrial homeostasis. In this study, we highlight the importance of AMPK in dietary fat supplementation-mediated alleviation of host energy stress in response to environmental changes.
Collapse
Affiliation(s)
- Wei He
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Xinyu Liu
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Ye Feng
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Hongwei Ding
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Haoyang Sun
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Zhongyu Li
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China
| | - Baoming Shi
- College of Animal Science and Technology, Northeast Agricultural University, 600 Changjiang Street, Harbin, 150030, PR China.
| |
Collapse
|
2
|
Athari SZ, Farajdokht F, Keyhanmanesh R, Mohaddes G. AMPK Signaling Pathway as a Potential Therapeutic Target for Parkinson's Disease. Adv Pharm Bull 2024; 14:120-131. [PMID: 38585465 PMCID: PMC10997932 DOI: 10.34172/apb.2024.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 09/30/2023] [Accepted: 10/08/2023] [Indexed: 04/09/2024] Open
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disease caused by the loss of dopaminergic neurons. Genetic factors, inflammatory responses, oxidative stress, metabolic disorders, cytotoxic factors, and mitochondrial dysfunction are all involved in neuronal death in neurodegenerative diseases. The risk of PD can be higher in aging individuals due to decreased mitochondrial function, energy metabolism, and AMP-activated protein kinase (AMPK) function. The potential of AMPK to regulate neurodegenerative disorders lies in its ability to enhance antioxidant capacity, reduce oxidative stress, improve mitochondrial function, decrease mitophagy and macroautophagy, and inhibit inflammation. In addition, it has been shown that modulating the catalytic activity of AMPK can protect the nervous system. This article reviews the mechanisms by which AMPK activation can modulate PD.
Collapse
Affiliation(s)
- Seyed Zanyar Athari
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fereshteh Farajdokht
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Rana Keyhanmanesh
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Gisou Mohaddes
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Biomedical Education, California Health Sciences University, College of Osteopathic Medicine, Clovis, CA, USA
| |
Collapse
|
3
|
Yung MMH, Siu MKY, Ngan HYS, Chan DW, Chan KKL. Orchestrated Action of AMPK Activation and Combined VEGF/PD-1 Blockade with Lipid Metabolic Tunning as Multi-Target Therapeutics against Ovarian Cancers. Int J Mol Sci 2022; 23:ijms23126857. [PMID: 35743298 PMCID: PMC9224484 DOI: 10.3390/ijms23126857] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 06/06/2022] [Accepted: 06/17/2022] [Indexed: 02/06/2023] Open
Abstract
Ovarian cancer is one of the most lethal gynecological malignancies worldwide, and chemoresistance is a critical obstacle in the clinical management of the disease. Recent studies have suggested that exploiting cancer cell metabolism by applying AMP-activated protein kinase (AMPK)-activating agents and distinctive adjuvant targeted therapies can be a plausible alternative approach in cancer treatment. Therefore, the perspectives about the combination of AMPK activators together with VEGF/PD-1 blockade as a dual-targeted therapy against ovarian cancer were discussed herein. Additionally, ferroptosis, a non-apoptotic regulated cell death triggered by the availability of redox-active iron, have been proposed to be governed by multiple layers of metabolic signalings and can be synergized with immunotherapies. To this end, ferroptosis initiating therapies (FITs) and metabolic rewiring and immunotherapeutic approaches may have substantial clinical potential in combating ovarian cancer development and progression. It is hoped that the viewpoints deliberated in this review would accelerate the translation of remedial concepts into clinical trials and improve the effectiveness of ovarian cancer treatment.
Collapse
Affiliation(s)
- Mingo M. H. Yung
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; (M.M.H.Y.); (M.K.Y.S.); (H.Y.S.N.)
| | - Michelle K. Y. Siu
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; (M.M.H.Y.); (M.K.Y.S.); (H.Y.S.N.)
| | - Hextan Y. S. Ngan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; (M.M.H.Y.); (M.K.Y.S.); (H.Y.S.N.)
| | - David W. Chan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; (M.M.H.Y.); (M.K.Y.S.); (H.Y.S.N.)
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
- Correspondence: or (D.W.C.); (K.K.L.C.); Tel.: +852-3917-9367 or +852-3943-6053 (D.W.C.); +852-2255-4260 (K.K.L.C.); Fax: +852-2816-1947 or +852-2603-5123 (D.W.C.); +852-2255-0947 (K.K.L.C.)
| | - Karen K. L. Chan
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; (M.M.H.Y.); (M.K.Y.S.); (H.Y.S.N.)
- Correspondence: or (D.W.C.); (K.K.L.C.); Tel.: +852-3917-9367 or +852-3943-6053 (D.W.C.); +852-2255-4260 (K.K.L.C.); Fax: +852-2816-1947 or +852-2603-5123 (D.W.C.); +852-2255-0947 (K.K.L.C.)
| |
Collapse
|
4
|
Hydroquinone destabilizes BIM mRNA through upregulation of p62 in chronic myeloid leukemia cells. Biochem Pharmacol 2022; 199:115017. [DOI: 10.1016/j.bcp.2022.115017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 03/19/2022] [Accepted: 03/21/2022] [Indexed: 11/21/2022]
|
5
|
Inhibition of Non-Small Cell Lung Cancer Proliferation and Survival by Rosemary Extract Is Associated with Activation of ERK and AMPK. Life (Basel) 2021; 12:life12010052. [PMID: 35054445 PMCID: PMC8779065 DOI: 10.3390/life12010052] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 12/21/2021] [Accepted: 12/26/2021] [Indexed: 12/24/2022] Open
Abstract
Non-small cell lung cancer (NSCLC) represents an aggressive form of lung cancer which often develops resistance to chemo- and radiotherapy emphasizing a need to identify novel treatment agents to combat it. Many plants contain compounds with anti-inflammatory, antimicrobial, antidiabetic, and anticancer properties and some plant-derived chemicals are used in the treatment of cancer. A limited number of in vitro and in vivo animal studies provide evidence of anticancer effects of rosemary (Rosmarinus officinalis) extract (RE); however, no studies have explored its role in H1299 NSCLC cells, and its underlying mechanism(s) of action are not understood. The current study examined the effects of RE on H1299 cell proliferation, survival, and migration using specific assays. Additionally, immunoblotting was used to investigate the effects of RE treatment on signalling molecules implicated in cell growth and survival. Treatment with RE dose-dependently inhibited H1299 proliferation with an IC50 value of 19 µg/mL. Similarly, RE dose-dependently reduced cell survival, and this reduction correlated with increased levels of cleaved poly (ADP-ribose) polymerase (PARP), a marker of apoptosis. RE was also able to inhibit cell migration as assessed with a wound healing assay. These cellular effects of RE were associated with an increase in phosphorylated levels of extracellular signal-regulated kinase (ERK), AMP-activated protein kinase (AMPK), and its downstream targets ACC, the mTORC1 protein raptor, and decreased p70S6K phosphorylation. More studies are required to fully examine the effects of RE against NSCLC.
Collapse
|
6
|
Na YR, Jung D, Song J, Park JW, Hong JJ, Seok SH. Pyruvate dehydrogenase kinase is a negative regulator of interleukin-10 production in macrophages. J Mol Cell Biol 2021; 12:543-555. [PMID: 31900478 PMCID: PMC7493030 DOI: 10.1093/jmcb/mjz113] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/11/2019] [Accepted: 11/09/2019] [Indexed: 02/07/2023] Open
Abstract
Interleukin-10 (IL-10) is the most potent anti-inflammatory cytokine in the body and plays an essential role in determining outcomes of many inflammatory diseases. Cellular metabolism is a critical determinant of immune cell function; however, it is currently unclear whether metabolic processes are specifically involved in IL-10 production. In this study, we aimed to find the central metabolic molecule regulating IL-10 production of macrophages, which are the main producers of IL-10. Transcriptomic analysis identified that metabolic changes were predominantly enriched in Kupffer cells at the early inflammatory phase of a mouse endotoxemia model. Among them, pyruvate dehydrogenase kinase (PDK)-dependent acute glycolysis was negatively involved in IL-10 production. Inhibition or knockdown of PDK selectively increased macrophage IL-10 expression. Mechanistically, PDK inhibition increased IL-10 production via profound phosphorylation of adenosine monophosphate (AMP)-activated protein kinase alpha 1 (AMPKα1) by restricting glucose uptake in lipopolysaccharide-stimulated macrophages. AMPKα1 consequently activated p38 mitogen-activated protein kinase, c-Jun N-terminal kinase, and cyclic AMP-responsive element-binding protein to regulate IL-10 production. Our study uncovers a previously unknown regulatory mechanism of IL-10 in activated macrophages involving an immunometabolic function of PDK.
Collapse
Affiliation(s)
- Yi Rang Na
- Macrophage Lab, Department of Microbiology and Immunology and Institute of Endemic Disease, Seoul National University College of Medicine, Chongno-gu, Seoul 03080, Republic of Korea
| | - Daun Jung
- Macrophage Lab, Department of Microbiology and Immunology and Institute of Endemic Disease, Seoul National University College of Medicine, Chongno-gu, Seoul 03080, Republic of Korea
| | - Juha Song
- Macrophage Lab, Department of Microbiology and Immunology and Institute of Endemic Disease, Seoul National University College of Medicine, Chongno-gu, Seoul 03080, Republic of Korea
| | - Jong-Wan Park
- Department of Biomedical Science, BK21-Plus Education Program, Seoul National University College of Medicine, Jongno-gu, Seoul 03080, Republic of Korea.,Department of Pharmacology, Seoul National University College of Medicine, Jongno-gu, Seoul 03080, Republic of Korea.,Cancer Research Institute and Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Jongno-gu, Seoul 03080, Republic of Korea
| | - Jung Joo Hong
- National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju 28116, Republic of Korea
| | - Seung Hyeok Seok
- Macrophage Lab, Department of Microbiology and Immunology and Institute of Endemic Disease, Seoul National University College of Medicine, Chongno-gu, Seoul 03080, Republic of Korea
| |
Collapse
|
7
|
Mollaei M, Hassan ZM, Khorshidi F, Langroudi L. Chemotherapeutic drugs: Cell death- and resistance-related signaling pathways. Are they really as smart as the tumor cells? Transl Oncol 2021; 14:101056. [PMID: 33684837 PMCID: PMC7938256 DOI: 10.1016/j.tranon.2021.101056] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/05/2021] [Accepted: 02/22/2021] [Indexed: 02/07/2023] Open
Abstract
Chemotherapeutic drugs kill cancer cells or control their progression all over the patient's body, while radiation- and surgery-based treatments perform in a particular site. Based on their mechanisms of action, they are classified into different groups, including alkylating substrates, antimetabolite agents, anti-tumor antibiotics, inhibitors of topoisomerase I and II, mitotic inhibitors, and finally, corticosteroids. Although chemotherapeutic drugs have brought about more life expectancy, two major and severe complications during chemotherapy are chemoresistance and tumor relapse. Therefore, we aimed to review the underlying intracellular signaling pathways involved in cell death and resistance in different chemotherapeutic drug families to clarify the shortcomings in the conventional single chemotherapy applications. Moreover, we have summarized the current combination chemotherapy applications, including numerous combined-, and encapsulated-combined-chemotherapeutic drugs. We further discussed the possibilities and applications of precision medicine, machine learning, next-generation sequencing (NGS), and whole-exome sequencing (WES) in promoting cancer immunotherapies. Finally, some of the recent clinical trials concerning the application of immunotherapies and combination chemotherapies were included as well, in order to provide a practical perspective toward the future of therapies in cancer cases.
Collapse
Affiliation(s)
- Mojtaba Mollaei
- Department of Immunology, School of Medicine, Tarbiat Modares University, Tehran, Iran.
| | | | - Fatemeh Khorshidi
- Department of Immunology, School of Medicine, Tarbiat Modares University, Tehran, Iran; Department of Immunology, Pasteur Institute of Iran, Tehran, Iran
| | - Ladan Langroudi
- Department of Immunology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| |
Collapse
|
8
|
Zhao J, Li G, Zhao X, Lin X, Gao Y, Raimundo N, Li GL, Shang W, Wu H, Song L. Down-regulation of AMPK signaling pathway rescues hearing loss in TFB1 transgenic mice and delays age-related hearing loss. Aging (Albany NY) 2020; 12:5590-5611. [PMID: 32240104 PMCID: PMC7185105 DOI: 10.18632/aging.102977] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 03/03/2020] [Indexed: 04/08/2023]
Abstract
AMP-activated protein kinase (AMPK) integrates the regulation of cell growth and metabolism. AMPK activation occurs in response to cellular energy decline and mitochondrial dysfunction triggered by reactive oxygen species (ROS). In aged Tg-mtTFB1 mice, a mitochondrial deafness mouse model, hearing loss is accompanied with cochlear pathology including reduced endocochlear potential (EP) and loss of spiral ganglion neurons (SGN), inner hair cell (IHC) synapses and outer hair cells (OHC). Accumulated ROS and increased apoptosis signaling were also detected in cochlear tissues, accompanied by activation of AMPK. To further explore the role of AMPK signaling in the auditory phenotype, we used genetically knocked out AMPKα1 as a rescue to Tg-mtTFB1 mice and observed: improved ABR wave I, EP and IHC function, normal SGNs, IHC synapses morphology and OHC survivals, with decreased ROS, reduced pro-apoptotic signaling (Bax) and increased anti-apoptotic signaling (Bcl-2) in the cochlear tissues, indicating that reduced AMPK attenuated apoptosis via ROS-AMPK-Bcl2 pathway in the cochlea. To conclude, AMPK hyperactivation causes accelerated presbycusis in Tg-mtTFB1 mice by redox imbalance and dysregulation of the apoptosis pathway. The effects of AMPK downregulation on pro-survival function and reduction of oxidative stress indicate AMPK serves as a target to rescue or relieve mitochondrial hearing loss.
Collapse
Affiliation(s)
- Jingjing Zhao
- Department of Otolaryngology, Head and Neck Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Gen Li
- Department of Otolaryngology, Head and Neck Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Xuan Zhao
- Navy Clinical Medical School, Anhui Medical University, Hefei, China
| | - Xin Lin
- Department of Otorhinolaryngology, Head and Neck Surgery, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Yunge Gao
- Department of Otolaryngology, Head and Neck Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Nuno Raimundo
- Institute of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Geng-Lin Li
- Department of Otorhinolaryngology, Eye and ENT Hospital, Fudan University, Shanghai, China
| | - Wei Shang
- Navy Clinical Medical School, Anhui Medical University, Hefei, China
- In Vitro Fertility (IVF) Center Department of Obstetrics and Gynecology, the Sixth Medical Center of PLA General Hospital, Beijing, China
| | - Hao Wu
- Department of Otolaryngology, Head and Neck Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Lei Song
- Department of Otolaryngology, Head and Neck Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| |
Collapse
|
9
|
Shim YS, Lee S, Park HW, Park SR. Sestrin2 Mediates IL-4-induced IgE Class Switching by Enhancing Germline ε Transcription in B Cells. Immune Netw 2020; 20:e19. [PMID: 32395371 PMCID: PMC7192835 DOI: 10.4110/in.2020.20.e19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Revised: 12/23/2019] [Accepted: 12/27/2019] [Indexed: 02/06/2023] Open
Abstract
Sestrin2 (Sesn2), a metabolic regulator, accumulates in response to a diverse array of cellular stresses. Sesn2 regulates cellular metabolism by inhibiting the mammalian target of rapamycin complex 1 through the AMP-activated protein kinase (AMPK) signaling pathway. Recently, researchers reported that Sesn2 regulates the differentiation and function of innate immune cells and T cells; however, the role of Sesn2 in B cells is largely unknown. In this study, we investigated the role of Sesn2 in Ig class switching and Ig production in mouse B cells. We observed that mouse B cells express Sesn2 mRNA. Interestingly, the expression of germline ε transcripts (GLTε) was selectively decreased in lipopolysaccharide-stimulated Sesn2−/− splenocytes. Overexpression of Sesn2 increased GLTε promoter activity in B cells. In addition, AICAR (an activator of AMPK) selectively increased IL-4-induced GLTε expression and surface IgE (sIgE) expression in splenocytes. Furthermore, AICAR selectively enhanced IL-4-induced GLTε expression, sIgE expression, and IgE production by anti-CD40-stimulated B cells. We observed that ovalbumin (OVA)-specific IgE concentration was reduced in OVA-challenged Sesn2−/− mice. Taken together, these results indicate that Sesn2-AMPK signaling selectively enhances IL-4-induced IgE class switching and IgE production by B cells, suggesting that this could be a therapeutic strategy targeting Sesn2 in IgE-mediated allergic diseases.
Collapse
Affiliation(s)
- You-Sun Shim
- Department of Microbiology, Myunggok Medical Research Institute, College of Medicine, Konyang University, Daejeon 35365, Korea
| | - Solji Lee
- Department of Cell Biology, College of Medicine, Konyang University, Daejeon 35365, Korea
| | - Hwan-Woo Park
- Department of Cell Biology, College of Medicine, Konyang University, Daejeon 35365, Korea
| | - Seok-Rae Park
- Department of Microbiology, Myunggok Medical Research Institute, College of Medicine, Konyang University, Daejeon 35365, Korea
| |
Collapse
|
10
|
Rottlerin is a pan phosphodiesterase inhibitor and can induce neurodifferentiation in IMR-32 human neuroblastoma cells. Eur J Pharmacol 2019; 857:172448. [DOI: 10.1016/j.ejphar.2019.172448] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 06/08/2019] [Accepted: 06/12/2019] [Indexed: 01/05/2023]
|
11
|
Kim HJ, You MK, Lee YH, Kim HJ, Adhikari D, Kim HA. Red pepper seed water extract inhibits preadipocyte differentiation and induces mature adipocyte apoptosis in 3T3-L1 cells. Nutr Res Pract 2018; 12:494-502. [PMID: 30515277 PMCID: PMC6277307 DOI: 10.4162/nrp.2018.12.6.494] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/08/2018] [Accepted: 08/20/2018] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND/OBJECTIVES Reducing the number of adipocytes by inducing apoptosis of mature adipocytes as well as suppressing differentiation of preadipocytes plays an important role in preventing obesity. This study examines the anti-adipogenic and pro-apoptotic effect of red pepper seed water extract (RPS) prepared at 4℃ (RPS4) in 3T3-L1 cells. MATERIALS/METHODS Effect of RPS4 or its fractions on lipid accumulation was determined in 3T3-L1 cells using oil red O (ORO) staining. The expressions of AMP-activated protein kinase (AMPK) and adipogenic associated proteins [peroxisome proliferator-activated receptor-γ (PPAR-γ), CCAAT/enhancer-binding proteins α (C/EBP α), sterol regulatory element binding protein-1c (SREBP-1c), fatty acid synthase (FAS), and acetyl-CoA carboxylase (ACC)] were measured in 3T3-L1 cells treated with RPS4. Apoptosis and the expression of Akt and Bcl-2 family proteins [B-cell lymphoma 2 (Bcl-2), Bcl-2-associated death promoter (Bad), Bcl-2 like protein 4 (Bax), Bal-2 homologous antagonist/killer (Bak)] were measured in mature 3T3-L1 cells treated with RPS4. RESULTS Treatment of RPS4 (0-75 µg/mL) or its fractions (0-50 µg/mL) for 24 h did not have an apparent cytotoxicity on pre and mature 3T3-L1 cells. RPS4 significantly suppressed differentiation and cellular lipid accumulation by increasing the phosphorylation of AMPK and reducing the expression of PPAR-γ, C/EBP α, SREBP-1c, FAS, and ACC. In addition, all fractions except ethyl acetate fraction significantly suppressed cellular lipid accumulation. RPS4 induced the apoptosis of mature adipocytes by hypophosphorylating Akt, increasing the expression of the pro-apoptotic proteins, Bak, Bax, and Bad, and reducing the expression of the anti-apoptotic proteins, Bcl-2 and p-Bad. CONCLUSIONS These finding suggest that RPS4 can reduce the numbers as well as the size of adipocytes and might useful for preventing and treating obesity.
Collapse
Affiliation(s)
| | - Mi-Kyoung You
- Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA
| | - Young-Hyun Lee
- Department of Food and Nutrition, Mokpo National University, 1666, Yeongsan-ro, Cheonggye-myeon, Muan-gun, Jeonnam 58554, Korea
| | - Hyun-Jung Kim
- College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Jeonnam 58554, Korea
| | - Deepak Adhikari
- College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Jeonnam 58554, Korea
| | - Hyeon-A Kim
- Department of Food and Nutrition, Mokpo National University, 1666, Yeongsan-ro, Cheonggye-myeon, Muan-gun, Jeonnam 58554, Korea
| |
Collapse
|
12
|
Le DDT, Jung S, Quynh NTN, Sandag Z, Lee BS, Kim S, Lee H, Lee H, Lee MS. Inhibitory role of AMP‑activated protein kinase in necroptosis of HCT116 colon cancer cells with p53 null mutation under nutrient starvation. Int J Oncol 2018; 54:702-712. [PMID: 30431068 DOI: 10.3892/ijo.2018.4634] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 10/12/2018] [Indexed: 11/06/2022] Open
Abstract
Simultaneous induction of other types of programmed cell death, alongside apoptosis, in cancer cells may be considered an attractive strategy for the development of more effective anticancer therapies. The present study aimed to investigate the role of AMP‑activated protein kinase (AMPK) in nutrient/serum starvation‑induced necroptosis, which is a programmed form of necrosis, in the presence or absence of p53. The present study detected higher cell proliferation and lower cell death rates in the HCT116 human colon cancer cell line containing a p53 null mutation (HCT116 p53‑/‑) compared with in HCT116 cells harboring wild‑type p53 (HCT116 p53+/+), as determined using a cell viability assay. Notably, western blot analysis revealed a relatively lower level of necroptosis in HCT116 p53‑/‑ cells compared with in HCT116 p53+/+ cells. Investigating the mechanism, it was revealed that necroptosis may be induced in HCT116 p53+/+ cells by significantly increasing reactive oxygen species (ROS) and decreasing mitochondrial membrane potential (MMP), whereas little alterations were detected in HCT116 p53‑/‑ cells. Unexpectedly, a much lower level of ATP was detected in HCT116 p53‑/‑ cells compared with in HCT116 p53+/+ cells. Accordingly, AMPK phosphorylation on the Thr172 residue was markedly increased in HCT116 p53‑/‑ cells. Furthermore, western blot analysis and ROS measurements indicated that AMPK inhibition, using dorsomorphin dihydrochloride, accelerated necroptosis by increasing ROS generation in HCT116 p53‑/‑ cells. However, AMPK activation by AICAR did not suppress necroptosis in HCT116 p53+/+ cells. In conclusion, these data strongly suggested that AMPK activation may be enhanced in HCT116 p53‑/‑ cells under serum‑depleted conditions via a drop in cellular ATP levels. In addition, activated AMPK may be at least partially responsible for the inhibition of necroptosis in HCT116 p53‑/‑ cells, but not in HCT116 p53+/+cells.
Collapse
Affiliation(s)
- Dan-Diem Thi Le
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Samil Jung
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Nguyen Thi Ngoc Quynh
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Zolzaya Sandag
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Beom Suk Lee
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Subeen Kim
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Hyegyeong Lee
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Hyojeong Lee
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Myeong-Sok Lee
- Department of Biological Science, Sookmyung Women's University, Seoul 04310, Republic of Korea
| |
Collapse
|
13
|
miR-1273g silences MAGEA3/6 to inhibit human colorectal cancer cell growth via activation of AMPK signaling. Cancer Lett 2018; 435:1-9. [DOI: 10.1016/j.canlet.2018.07.031] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/23/2018] [Accepted: 07/23/2018] [Indexed: 12/23/2022]
|
14
|
Hatamipour M, Ramezani M, Tabassi SAS, Johnston TP, Ramezani M, Sahebkar A. Demethoxycurcumin: A naturally occurring curcumin analogue with antitumor properties. J Cell Physiol 2018; 233:9247-9260. [PMID: 30076727 DOI: 10.1002/jcp.27029] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 06/25/2018] [Indexed: 12/12/2022]
Abstract
The eradication of cancer in a patient remains an elusive challenge despite advances in early detection and diagnosis, chemo- and immunotherapy, pinpoint radiation treatments, and expert surgical intervention. Although significant gains have been made in our understanding of cancer cell biology, a definite cure for most cancers does not exist at present. Thus, it is not surprising that the research and medical communities continue to explore the importance and therapeutic potential of natural products in their multimodality cancer treatment approach. Curcuminoids found in turmeric are one such class of natural products that have been extensively investigated for their potential to halt the progression of cancer cell proliferation and, more important, to stop metastasis from occurring. In this review, we examine one curcuminoid (demethoxycurcumin [DMC]) largely because of its increased stability and better aqueous solubility at physiological pH, unlike the more well-known curcuminoid (curcumin), which is largely unabsorbed after oral ingestion. The present review will focus on the signaling pathways that DMC utilizes to modulate the growth, invasion, and metastasis of cancer cells in an effort to provide enhanced mechanistic insight into DMC's action as it pertains to brain, ovarian, breast, lung, skin, and prostate cancer. Additionally, this review will attempt to provide an overview of DMC's mechanism of action by modulating apoptosis, cell cycle, angiogenesis, metastasis, and chemosensitivity. Lastly, it is hoped that increased understanding will be gained concerning DMC's interactive role with microRNA-551a, 5' adenosine monophosphate-activated protein kinase, nuclear factor-κB, Wnt inhibitory factor-1, and heat shock protein 70 to affect the progression of cancer.
Collapse
Affiliation(s)
- Mahdi Hatamipour
- Nanotechnology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahin Ramezani
- Nanotechnology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Thomas P Johnston
- Division of Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, Missouri
| | - Mahnaz Ramezani
- Immunology of Infectious Diseases Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Amirhosein Sahebkar
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.,Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| |
Collapse
|
15
|
Tang J, He A, Yan H, Jia G, Liu G, Chen X, Cai J, Tian G, Shang H, Zhao H. Damage to the myogenic differentiation of C2C12 cells by heat stress is associated with up-regulation of several selenoproteins. Sci Rep 2018; 8:10601. [PMID: 30006533 PMCID: PMC6045685 DOI: 10.1038/s41598-018-29012-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 07/04/2018] [Indexed: 01/05/2023] Open
Abstract
This study was conducted to profile the selenoprotein encoding genes or proteins in mouse C2C12 cells and integrate their roles in the skeletal cell damage induced by heat stress (HS). Cells were cultured at 37.0 °C or 41.5 °C for 4, 6 or 8 days. The mRNA expression of 24 selenoprotein encoding genes and abundance of 5 selenoproteins were investigated. HS suppressed myogenic differentiation and impaired the development of muscle myotubes. HS down-regulated (P < 0.01) mRNA abundance of MYOD and MYOGENIN, and decreased (P < 0.01) MYOGENIN protein expression, HS elevated (P < 0.01) HSP70 and (P < 0.01) the ratio of BCL-2 to BAX at both mRNA and protein level. Meanwhile, HS up-regulated (P < 0.01–0.05) expressions of 18, 11 and 8 selenoprotein encoding genes after 4, 6 and 8 days of hyperthermia, and only down-regulated (P < 0.01) DIO2 after 6 and 8 days of hyperthermia, respectively. Furthermore, HS influenced expression of selenoproteins and up-regulated (P < 0.01–0.05) GPX1, GPX4 and SEPN1 after 6 days of HS. The damage to development of mouse skeletal muscle myotubes by HS accompanied with the up-regulation of both selenoprotein encoding genes and proteins, which suggested a potential protective effect of selenoprotein on hyperthermia associated damage in C2C12 cells.
Collapse
Affiliation(s)
- Jiayong Tang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China.,Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Aihua He
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Hui Yan
- Department of Animal Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Gang Jia
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Guangmang Liu
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Xiaoling Chen
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Jingyi Cai
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Gang Tian
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Haiying Shang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Hua Zhao
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China. .,Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China.
| |
Collapse
|
16
|
Casselbrant A, Söfteland JM, Hellström M, Malinauskas M, Oltean M. Luminal Polyethylene Glycol Alleviates Intestinal Preservation Injury Irrespective of Molecular Size. J Pharmacol Exp Ther 2018; 366:29-36. [DOI: 10.1124/jpet.117.247023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
|
17
|
Weng JR, Dokla EME, Bai LY, Chen CS, Chiu SJ, Shieh TM. A 5′ AMP-Activated Protein Kinase Enzyme Activator, Compound 59, Induces Autophagy and Apoptosis in Human Oral Squamous Cell Carcinoma. Basic Clin Pharmacol Toxicol 2018; 123:21-29. [DOI: 10.1111/bcpt.12976] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/24/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Jing-Ru Weng
- Department of Marine Biotechnology and Resources; National Sun Yat-sen University; Kaohsiung Taiwan
| | - Eman M. E. Dokla
- Pharmaceutical Chemistry Department; Faculty of Pharmacy; Ain Shams University; Abbassia Cairo Egypt
| | - Li-Yuan Bai
- College of Medicine; China Medical University; Taichung Taiwan
- Division of Hematology and Oncology; Department of Internal Medicine; China Medical University Hospital; Taichung Taiwan
| | - Ching-Shih Chen
- Institute of Biological Chemistry; Academia Sinica; Taipei Taiwan
- Institute of New Drug Development; China Medical University; Taichung Taiwan
| | - Shih-Jiuan Chiu
- School of Pharmacy; Taipei Medical University; Taipei Taiwan
| | - Tzong-Ming Shieh
- Department of Dental Hygiene; China Medical University; Taichung Taiwan
| |
Collapse
|
18
|
Chen MB, Liu YY, Xing ZY, Zhang ZQ, Jiang Q, Lu PH, Cao C. Itraconazole-Induced Inhibition on Human Esophageal Cancer Cell Growth Requires AMPK Activation. Mol Cancer Ther 2018; 17:1229-1239. [PMID: 29592879 DOI: 10.1158/1535-7163.mct-17-1094] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/11/2018] [Accepted: 03/22/2018] [Indexed: 11/16/2022]
Abstract
We here evaluated the antiesophageal cancer cell activity by the antifungal drug itraconazole. Our results show that μg/mL concentrations of itraconazole potently inhibited survival and proliferation of established (TE-1 and Eca-109) and primary human esophageal cancer cells. Itraconazole activated AMPK signaling, which was required for subsequent esophageal cancer cell death. Pharmacologic AMPK inhibition, AMPKα1 shRNA, or dominant negative mutation (T172A) almost completely abolished itraconazole-induced cytotoxicity against esophageal cancer cells. Significantly, itraconazole induced AMPK-dependent autophagic cell death (but not apoptosis) in esophageal cancer cells. Furthermore, AMPK activation by itraconazole induced multiple receptor tyrosine kinases (RTKs: EGFR, PDGFRα, and PDGFRβ), lysosomal translocation, and degradation to inhibit downstream Akt activation. In vivo, itraconazole oral gavage potently inhibited Eca-109 tumor growth in SCID mice. It was yet ineffective against AMPKα1 shRNA-expressing Eca-109 tumors. The in vivo growth of the primary human esophageal cancer cells was also significantly inhibited by itraconazole administration. AMPK activation, RTK degradation, and Akt inhibition were observed in itraconazole-treated tumors. Together, itraconazole inhibits esophageal cancer cell growth via activating AMPK signaling. Mol Cancer Ther; 17(6); 1229-39. ©2018 AACR.
Collapse
Affiliation(s)
- Min-Bin Chen
- Department of Radiotherapy & Oncology, Kunshan First People's Hospital Affiliated to Jiangsu University, Kunshan, China
| | - Yuan-Yuan Liu
- Clinical Research and Lab Center, Kunshan First People's Hospital Affiliated to Jiangsu University, Kunshan, China
| | - Zhao-Yu Xing
- The Department of Urology, the Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Zhi-Qing Zhang
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Qin Jiang
- The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, China.
| | - Pei-Hua Lu
- Department of Medical Oncology, Wuxi People's Hospital Affiliated to Nanjing Medical University, Wuxi, China.
| | - Cong Cao
- Institute of Neuroscience, Soochow University, Suzhou, China. .,The Affiliated Eye Hospital of Nanjing Medical University, Nanjing, China.,The Municipal Hospital of Suzhou, North District, Suzhou, China
| |
Collapse
|
19
|
Loss of BIM increases mitochondrial oxygen consumption and lipid oxidation, reduces adiposity and improves insulin sensitivity in mice. Cell Death Differ 2017; 25:217-225. [PMID: 29053141 DOI: 10.1038/cdd.2017.168] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 08/10/2017] [Accepted: 09/12/2017] [Indexed: 12/12/2022] Open
Abstract
BCL-2 proteins are known to engage each other to determine the fate of a cell after a death stimulus. However, their evolutionary conservation and the many other reported binding partners suggest an additional function not directly linked to apoptosis regulation. To identify such a function, we studied mice lacking the BH3-only protein BIM. BIM-/- cells had a higher mitochondrial oxygen consumption rate that was associated with higher mitochondrial complex IV activity. The consequences of increased oxygen consumption in BIM-/- mice were significantly lower body weights, reduced adiposity and lower hepatic lipid content. Consistent with reduced adiposity, BIM-/- mice had lower fasting blood glucose, improved insulin sensitivity and hepatic insulin signalling. Lipid oxidation was increased in BIM-/- mice, suggesting a mechanism for their metabolic phenotype. Our data suggest a role for BIM in regulating mitochondrial bioenergetics and metabolism and support the idea that regulation of metabolism and cell death are connected.
Collapse
|
20
|
Masoudkabir F, Sarrafzadegan N, Gotay C, Ignaszewski A, Krahn AD, Davis MK, Franco C, Mani A. Cardiovascular disease and cancer: Evidence for shared disease pathways and pharmacologic prevention. Atherosclerosis 2017; 263:343-351. [PMID: 28624099 PMCID: PMC6207942 DOI: 10.1016/j.atherosclerosis.2017.06.001] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 05/08/2017] [Accepted: 06/01/2017] [Indexed: 12/21/2022]
Abstract
Cardiovascular disease (CVD) and cancer are leading causes of mortality and morbidity worldwide. Strategies to improve their treatment and prevention are global priorities and major focus of World Health Organization's joint prevention programs. Emerging evidence suggests that modifiable risk factors including diet, sedentary lifestyle, obesity and tobacco use are central to the pathogenesis of both diseases and are reflected in common genetic, cellular, and signaling mechanisms. Understanding this important biological overlap is critical and may help identify novel therapeutic and preventative strategies for both disorders. In this review, we will discuss the shared genetic and molecular factors central to CVD and cancer and how the strategies commonly used for the prevention of atherosclerotic vascular disease can be applied to cancer prevention.
Collapse
Affiliation(s)
- Farzad Masoudkabir
- Cardiac Primary Prevention Research Center, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Nizal Sarrafzadegan
- Isfahan Cardiovascular Research Center, Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran; School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada.
| | - Carolyn Gotay
- School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada; Cancer Control Research Program, British Columbia Cancer Research Centre, Vancouver, British Columbia, Canada
| | - Andrew Ignaszewski
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Andrew D Krahn
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Margot K Davis
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Christopher Franco
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Arya Mani
- Yale Cardiovascular Genetics Program, Yale Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| |
Collapse
|
21
|
Haikala HM, Anttila JM, Klefström J. MYC and AMPK-Save Energy or Die! Front Cell Dev Biol 2017; 5:38. [PMID: 28443281 PMCID: PMC5386972 DOI: 10.3389/fcell.2017.00038] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 03/27/2017] [Indexed: 12/12/2022] Open
Abstract
MYC sustains non-stop proliferation by altering metabolic machinery to support growth of cell mass. As part of the metabolic transformation MYC promotes lipid, nucleotide and protein synthesis by hijacking citric acid cycle to serve biosynthetic processes, which simultaneously exhausts ATP production. This leads to the activation of cellular energy sensing protein, AMP-activated protein kinase (AMPK). Cells with normal growth control can stop cell proliferation machinery to replenish ATP reservoirs whereas MYC prevents such break by blocking the cell cycle exit. The relentless cell cycle activation, accompanied by sustained metabolic stress and AMPK activity, switches the energy-saving AMPK to pro-apoptotic AMPK. The AMPK-involving metabolic side of MYC apoptosis may provide novel avenues for therapeutic development. Here we first review the role of anabolic MYC and catabolic AMPK pathways in context of cancer and then discuss how the concomitant activity of both pathways in tumor cells may result in targetable synthetic lethal vulnerabilities.
Collapse
Affiliation(s)
- Heidi M Haikala
- Research Programs Unit/Translational Cancer Biology, Cancer Cell Circuitry Laboratory, Institute of Biomedicine, University of HelsinkiHelsinki, Finland
| | - Johanna M Anttila
- Research Programs Unit/Translational Cancer Biology, Cancer Cell Circuitry Laboratory, Institute of Biomedicine, University of HelsinkiHelsinki, Finland
| | - Juha Klefström
- Research Programs Unit/Translational Cancer Biology, Cancer Cell Circuitry Laboratory, Institute of Biomedicine, University of HelsinkiHelsinki, Finland
| |
Collapse
|
22
|
Wang C, Liang C, Feng W, Xia X, Chen F, Qiao E, Zhang X, Chen D, Ling Z, Yang H. ICT1 knockdown inhibits breast cancer cell growth via induction of cell cycle arrest and apoptosis. Int J Mol Med 2017; 39:1037-1045. [PMID: 28290601 DOI: 10.3892/ijmm.2017.2913] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 01/23/2017] [Indexed: 11/05/2022] Open
Abstract
The protein encoded by immature colon carcinoma transcript 1 (ICT1) is a component of the human mitochondrial ribosome, and is reported to be implicated in cell proliferation, viability and apoptosis of HeLa cells. This study was conducted to investigate the role of ICT1 in human breast cancer. Oncomine database was used to investigate ICT1 expression in human breast cancer tissues compared to normal tissues. The results showed that ICT1 was highly overexpressed in various human breast cancer subtypes. Then short hairpin RNA (shRNA)-mediated knockdown of ICT1 was performed in human breast cancer ZR-75-30 and T-47D cells. A series of functional analysis, including MTT, colony formation and flow cytometry assays were conducted after ICT1 knockdown. Our results demonstrated that knockdown of ICT1 significantly suppressed cell viability and proliferation through cell cycle arrest at the G2/M phase and induced apoptosis in breast cancer cells. Furthermore, knockdown of ICT1 altered signaling pathways associated with cell growth and apoptosis, including phospho‑BAD (Ser112), phospho-PRAS40 (Thr246) and induction of phospho‑AMPKα (Thr172). Additionally, it was further confirmed by western blot analysis that ICT1 knockdown altered the expression of apoptosis- or cell cycle‑related proteins such as Bcl-2, caspase-3, CDK1, CDK2 and cyclin B. In conclusion, targeting ICT1 in breast cancer cells may provide a new strategy for breast cancer gene therapy.
Collapse
Affiliation(s)
- Chen Wang
- Department of Oncology, First Clinical Medical College, Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Chenlu Liang
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Weiliang Feng
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Xianghou Xia
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Feng Chen
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Enqi Qiao
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Xiping Zhang
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Daobao Chen
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Zhiqiang Ling
- Department of Breast Surgery, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Hongjian Yang
- Department of Oncology, First Clinical Medical College, Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| |
Collapse
|
23
|
Hu K, Gong X, Ai Q, Lin L, Dai J, Cai L, Jiang R, Ge P, Zhang L. Endogenous AMPK acts as a detrimental factor in fulminant hepatitis via potentiating JNK-dependent hepatocyte apoptosis. Cell Death Dis 2017; 8:e2637. [PMID: 28252653 PMCID: PMC5386558 DOI: 10.1038/cddis.2017.62] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 01/19/2017] [Accepted: 01/24/2017] [Indexed: 02/06/2023]
Abstract
The energy sensor AMP-activated protein kinase (AMPK) is crucial for energy homeostasis. Recent studies have revealed that AMPK is involved in various energy-intensive pathological processes such as inflammation and apoptosis. The physiological functions of hepatic AMPK have been well studied, but the pathological significance of AMPK in liver disorders remains largely unknown. In the present study, the phosphorylation status and the roles of AMPK were investigated in mice with lipopolysaccharide (LPS)/d-galactosamine (D-Gal)-induced fulminant hepatitis. The experimental data indicated that the phosphorylation of hepatic AMPK increased in mice with LPS/D-Gal-induced fulminant hepatitis. Pretreatment with the AMPK inhibitor compound C enhanced the early production of pro-inflammatory cytokines but suppressed the late activation of the caspase cascade, reduced the number of TUNEL-positive cells, decreased the elevation of aminotransferases, alleviated the histological abnormalities and improved the survival rate of LPS/D-Gal-insulted mice. Pretreatment with compound C suppressed LPS/D-Gal-induced phosphorylation of JNK. Inhibition of JNK alleviated LPS/D-Gal-induced liver injury, but the level of p53 remained unchanged in mice exposed to LPS/D-Gal. Post-insult treatment with the AMPK activator A-769662 further increased the phosphorylation levels of AMPK and JNK, enhanced hepatocyte apoptosis and deteriorated liver injury, all of these effects could be reversed by co-administration of the AMPK inhibitor or JNK inhibitor. Interestingly, post-insult treatment with the AMPK inhibitor also resulted in beneficial outcomes. These data suggested that AMPK might be a late detrimental factor in LPS/D-Gal-induced hepatitis via potentiating JNK-dependent hepatocyte apoptosis and AMPK might become a pharmacological target for the intervention of fulminant hepatitis.
Collapse
Affiliation(s)
- Kai Hu
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
| | - Xianqiong Gong
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China.,Hepatology Center, Xiamen Hospital of Traditional Chinese Medicine, Xiamen, Fujian Province, China
| | - Qing Ai
- Department of Physiology, Chongqing Medical University, Chongqing, China
| | - Ling Lin
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
| | - Jie Dai
- Hospital of Chongqing University of Arts and Sciences, Chongqing, China
| | - Lu Cai
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, China
| | - Rong Jiang
- Laboratory of Stem cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Pu Ge
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
| | - Li Zhang
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China.,Laboratory of Stem cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| |
Collapse
|
24
|
AMPK and PKA interaction in the regulation of survival of liver cancer cells subjected to glucose starvation. Oncotarget 2017; 7:17815-28. [PMID: 26894973 PMCID: PMC4951252 DOI: 10.18632/oncotarget.7404] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 01/29/2016] [Indexed: 01/12/2023] Open
Abstract
The signaling pathways that govern survival response in hepatic cancer cells subjected to nutritional restriction have not been clarified yet. In this study we showed that liver cancer cells undergoing glucose deprivation both arrested in G0/G1 and died mainly by apoptosis. Treatment with the AMPK activator AICAR phenocopied the effect of glucose deprivation on cell survival, whereas AMPK silencing in HepG2/C3A, HuH-7 or SK-Hep-1 cells blocked the cell cycle arrest and the increase in apoptotic death induced by glucose starvation. Both AMPK and PKA were promptly activated after glucose withdrawal. PKA signaling had a dual role during glucose starvation: whereas it elicited an early decreased in cell viability, it later improved this parameter. We detected AMPK phosphorylation (AMPKα(Ser173)) by PKA, which was increased in glucose starved cells and was associated with diminution of AMPK activation. To better explore this inhibitory effect, we constructed a hepatocarcinoma derived cell line which stably expressed an AMPK mutant lacking that PKA phosphorylation site: AMPKα1(S173C). Expression of this mutant significantly decreased viability in cells undergoing glucose starvation. Furthermore, after 36 h of glucose deprivation, the index of AMPKα1(S173C) apoptotic cells doubled the apoptotic index observed in control cells. Two main remarks arise: 1. AMPK is the central signaling kinase in the scenario of cell cycle arrest and death induced by glucose starvation in hepatic cancer cells; 2. PKA phosphorylation of Ser173 comes out as a strong control point that limits the antitumor effects of AMPK in this situation.
Collapse
|
25
|
The Anticancer Agent, Di-2-Pyridylketone 4,4-Dimethyl-3-Thiosemicarbazone (Dp44mT), Up-Regulates the AMPK-Dependent Energy Homeostasis Pathway in Cancer Cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:2916-2933. [DOI: 10.1016/j.bbamcr.2016.09.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 08/22/2016] [Accepted: 09/14/2016] [Indexed: 11/19/2022]
|
26
|
Chen L, Chen Q, Deng G, Kuang S, Lian J, Wang M, Zhu H. AMPK activation by GSK621 inhibits human melanoma cells in vitro and in vivo. Biochem Biophys Res Commun 2016; 480:515-521. [PMID: 27751856 DOI: 10.1016/j.bbrc.2016.10.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Accepted: 10/14/2016] [Indexed: 12/15/2022]
Abstract
Recent studies suggest that forced activation of AMP-activated protein kinase (AMPK) could inhibit melanoma cell proliferation. In this report, we evaluated the anti-melanoma cell activity by a novel small-molecular AMPK activator, GSK621. Treatment of GSK621 decreased survival and proliferation of human melanoma cells (A375, WM-115 and SK-Mel-2 lines), which was accompanied by activation of caspase-3/-9 and apoptosis. Reversely, caspase inhibitors attenuated GSK621-induced cytotoxicity against melanoma cells. Significantly, GSK621 was more potent than other AMPK activators (A769662, Compound 13 and AICAR) in inhibiting melanoma cells. Intriguingly, same GSK621 treatment was non-cytotoxic or pro-apoptotic against human melanocytes. Molecularly, we showed that activation of AMPK mediated GSK621's activity against melanoma cells. AMPKα1 shRNA knockdown or dominant negative mutation (T172A) dramatically attenuated GSK621-induced melanoma cell lethality. Further studies revealed that MEK-ERK activation might be the primary resistance factor of GSK621. MEK-ERK inhibition, either genetically or pharmacologically, significantly sensitized melanoma cells to GSK-621. Remarkably, intraperitoneal (i.p.) injection of GSK621 inhibited A375 tumor growth in SCID mice. Co-administration of MEK-ERK inhibitor MEK162 further sensitized GSK621-induced anti-A375 tumor activity in vivo. Together, the results imply that targeted activation of AMPK by GSK621 inhibits melanoma cell survival and proliferation. MEK-ERK inhibition may further sensitize GSK621's anti-melanoma cell activity in vitro and in vivo.
Collapse
Affiliation(s)
- Lezi Chen
- Department of Plastic and Peripheral Vascular Surgery, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Quan Chen
- Guangzhou Institute of Dermatology, Guangzhou, China
| | - Guosan Deng
- Department of Plastic and Peripheral Vascular Surgery, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China.
| | - Shifeng Kuang
- Department of Plastic and Peripheral Vascular Surgery, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China.
| | - Jihong Lian
- Department of Plastic and Peripheral Vascular Surgery, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Mian Wang
- Department of Plastic and Peripheral Vascular Surgery, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Huilan Zhu
- Guangzhou Institute of Dermatology, Guangzhou, China
| |
Collapse
|
27
|
Sabnis HS, Bradley HL, Tripathi S, Yu WM, Tse W, Qu CK, Bunting KD. Synergistic cell death in FLT3-ITD positive acute myeloid leukemia by combined treatment with metformin and 6-benzylthioinosine. Leuk Res 2016; 50:132-140. [PMID: 27760406 DOI: 10.1016/j.leukres.2016.10.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 08/23/2016] [Accepted: 10/04/2016] [Indexed: 02/08/2023]
Abstract
Current therapy for acute myeloid leukemia (AML) primarily includes high-dose cytotoxic chemotherapy with or without allogeneic stem cell transplantation. Targeting unique cellular metabolism of cancer cells is a potentially less toxic approach. Monotherapy with mitochondrial inhibitors like metformin have met with limited success since escape mechanisms such as increased glycolytic ATP production, especially in hyperglycemia, can overcome the metabolic blockade. As an alternative strategy for metformin therapy, we hypothesized that the combination of 6-benzylthioinosine (6-BT), a broad-spectrum metabolic inhibitor, and metformin could block this drug resistance mechanism. Metformin treatment alone resulted in significant suppression of ROS and mitochondrial respiration with increased glycolysis accompanied by modest cytotoxicity (10-25%). In contrast, 6-BT monotherapy resulted in inhibition of glucose uptake, decreased glycolysis, and decreased ATP with minimal changes in ROS and mitochondrial respiration. The combination of 6-BT with metformin resulted in significant cytotoxicity (60-70%) in monocytic AML cell lines and was associated with inhibition of FLT3-ITD activated STAT5 and reduced c-Myc and GLUT-1 expression. Therefore, although the anti-tumor and metabolic effects of metformin have been limited by the metabolic reprogramming within cells, the novel combination of 6-BT and metformin targets this bypass mechanism resulting in reduced glycolysis, STAT5 inhibition, and increased cell death.
Collapse
Affiliation(s)
- Himalee S Sabnis
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Heath L Bradley
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Shweta Tripathi
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Wen-Mei Yu
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - William Tse
- Department of Medicine, Division of Bone Marrow Transplantation, University of Louisville, Louisville, KY, USA, USA
| | - Cheng-Kui Qu
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Kevin D Bunting
- Department of Pediatrics, Division of Hem/Onc/BMT, Emory University, Atlanta, GA, USA; Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, GA, USA.
| |
Collapse
|
28
|
Bairwa SC, Parajuli N, Dyck JRB. The role of AMPK in cardiomyocyte health and survival. Biochim Biophys Acta Mol Basis Dis 2016; 1862:2199-2210. [PMID: 27412473 DOI: 10.1016/j.bbadis.2016.07.001] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 07/05/2016] [Accepted: 07/05/2016] [Indexed: 01/09/2023]
Abstract
Cellular energy homeostasis is a fundamental process that governs the overall health of the cell and is paramount to cell survival. Central to this is the control of ATP generation and utilization, which is regulated by a complex myriad of enzymatic reactions controlling cellular metabolism. In the cardiomyocyte, ATP generated from substrate catabolism is used for numerous cellular processes including maintaining ionic homeostasis, cell repair, protein synthesis and turnover, organelle turnover, and contractile function. In many instances, cardiovascular disease is associated with impaired cardiac energetics and thus the signalling that regulates pathways involved in cardiomyocyte metabolism may be potential targets for pharmacotherapy designed to help treat cardiovascular disease. An important regulator of cardiomyocyte energy homeostasis is adenosine monophosphate-activated protein kinase (AMPK). AMPK is a serine-threonine kinase that functions primarily as a metabolic sensor to coordinate anabolic and catabolic activities in the cell via the phosphorylation of multiple proteins involved in metabolic pathways. In addition to the direct role that AMPK plays in the regulation of cardiomyocyte metabolism, AMPK can also either directly or indirectly influence other cellular processes such as regulating mitochondrial function, post-translation acetylation, autophagy, mitophagy, endoplasmic reticulum stress, and apoptosis. Thus, AMPK is implicated in the control of a wide variety of cellular processes that can influence cardiomyocyte health and survival. In this review, we will discuss the important role that AMPK plays in regulating cardiac metabolism, as well as the additional cellular processes that may contribute to cardiomyocyte function and survival in the healthy and the diseased heart. This article is part of a Special Issue entitled: The role of post-translational protein modifications on heart and vascular metabolism edited by Jason R.B. Dyck & Jan. F.C. Glatz.
Collapse
Affiliation(s)
- Suresh C Bairwa
- Department of Medicine, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Nirmal Parajuli
- Department of Medicine, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada
| | - Jason R B Dyck
- Department of Medicine, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada; Department of Pediatrics, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, University of Alberta, Edmonton, Alberta, Canada.
| |
Collapse
|
29
|
Liu J, Wu J, Sun A, Sun Y, Yu X, Liu N, Dong S, Yang F, Zhang L, Zhong X, Xu C, Lu F, Zhang W. Hydrogen sulfide decreases high glucose/palmitate-induced autophagy in endothelial cells by the Nrf2-ROS-AMPK signaling pathway. Cell Biosci 2016; 6:33. [PMID: 27222705 PMCID: PMC4877995 DOI: 10.1186/s13578-016-0099-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/26/2016] [Indexed: 12/24/2022] Open
Abstract
Background Excessive autophagy induced by extravagant oxidative stress is the main reason for diabetes-induced vascular endothelial cells dysfunction. Hydrogen sulfide (H2S) has anti-oxidative effects but its regulation on excessive autophagy of vascular endothelial cells is unclear. Methods In this study, aorta of db/db mice (28 weeks old) and rat aortic endothelial cells (RAECs) treated with 40 mM glucose and 500 μM palmitate acted as type II diabetic animal and cellular models, respectively, and 100 μMNaHS was used as an exogenous H2S donor. The apoptosis level was measured by terminal deoxynucleotidyl transferase mediated dUTP nick-end labeling (TUNEL) staining and Hoechst 33342/PI staining. The activities of SOD, CAT and respiratory complexes were also measured. The mRNA levels of SOD and CAT were detected by real-time PCR. AMPK-siRNA was used to detect the effect of AMPK on autophagy. Western blotting was used to detected the protein level. Results H2S production was decreased (p < 0.05, p < 0.01) both in vitro and in vivo; NaHS treatment rescued this impairment (p < 0.05, p < 0.01). The expression of adhesive proteins was increased (p < 0.05, p < 0.01) both in vitro and in vivo; NaHS attenuated (p < 0.05, p < 0.01) these alterations. NaHS could protect endothelial cells against apoptosis induced by type II diabetes (p < 0.05, p < 0.01). Furthermore, the expressions and activities of SOD and CAT were impaired (p < 0.05, p < 0.01) in endothelial cells of diabetes II; NaHS treatment attenuated (p < 0.05) this impairment. NaHS also increased ATP production (p < 0.05) and activities of respiratory complexes (p < 0.05), and the ratio of p-AMPK to AMPK was also decreased by NaHS (p < 0.01). The level of autophagy in endothelial cells was also decreased (p < 0.05, p < 0.01) by NaHS treatment and AMPK-siRNA treatment. The expression of Nrf2 in the nuclei was increased (p < 0.05) by NaHS treatment. Conclusion Exogenous H2S might protect arterial endothelial cells by suppressing excessive autophagy induced by oxidative stress through the Nrf2-ROS-AMPK signaling pathway. Electronic supplementary material The online version of this article (doi:10.1186/s13578-016-0099-1) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Jiaqi Liu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Jichao Wu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Aili Sun
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Yu Sun
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Xiangjing Yu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Ning Liu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Shiyun Dong
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Fan Yang
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Linxue Zhang
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Xin Zhong
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Changqing Xu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Fanghao Lu
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| | - Weihua Zhang
- Department of Pathophysiology, Harbin Medical University, Harbin, 150086 China
| |
Collapse
|
30
|
Yung MMH, Ngan HYS, Chan DW. Targeting AMPK signaling in combating ovarian cancers: opportunities and challenges. Acta Biochim Biophys Sin (Shanghai) 2016; 48:301-17. [PMID: 26764240 PMCID: PMC4886241 DOI: 10.1093/abbs/gmv128] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 10/29/2015] [Indexed: 12/25/2022] Open
Abstract
The development and strategic application of effective anticancer therapies have turned out to be one of the most critical approaches of managing human cancers. Nevertheless, drug resistance is the major obstacle for clinical management of these diseases especially ovarian cancer. In the past years, substantial studies have been carried out with the aim of exploring alternative therapeutic approaches to enhance efficacy of current chemotherapeutic regimes and reduce the side effects caused in order to produce significant advantages in overall survival and to improve patients' quality of life. Targeting cancer cell metabolism by the application of AMP-activated protein kinase (AMPK)-activating agents is believed to be one of the most plausible attempts. AMPK activators such as 5-aminoimidazole-4-carboxamide 1-β-d-ribofuranoside, A23187, metformin, and bitter melon extract not only prevent cancer progression and metastasis but can also be applied as a supplement to enhance the efficacy of cisplatin-based chemotherapy in human cancers such as ovarian cancer. However, because of the undesirable outcomes along with the frequent toxic side effects of most pharmaceutical AMPK activators that have been utilized in clinical trials, attentions of current studies have been aimed at the identification of replaceable reagents from nutraceuticals or traditional medicines. However, the underlying molecular mechanisms of many nutraceuticals in anticancer still remain obscure. Therefore, better understanding of the functional characterization and regulatory mechanism of natural AMPK activators would help pharmaceutical development in opening an area to intervene ovarian cancer and other human cancers.
Collapse
Affiliation(s)
- Mingo M H Yung
- Department of Obstetrics and Gynaecology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Hextan Y S Ngan
- Department of Obstetrics and Gynaecology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - David W Chan
- Department of Obstetrics and Gynaecology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| |
Collapse
|
31
|
Law BYK, Mok SWF, Wu AG, Lam CWK, Yu MXY, Wong VKW. New Potential Pharmacological Functions of Chinese Herbal Medicines via Regulation of Autophagy. Molecules 2016; 21:359. [PMID: 26999089 PMCID: PMC6274228 DOI: 10.3390/molecules21030359] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/29/2016] [Accepted: 03/09/2016] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a universal catabolic cellular process for quality control of cytoplasm and maintenance of cellular homeostasis upon nutrient deprivation and environmental stimulus. It involves the lysosomal degradation of cellular components such as misfolded proteins or damaged organelles. Defects in autophagy are implicated in the pathogenesis of diseases including cancers, myopathy, neurodegenerations, infections and cardiovascular diseases. In the recent decade, traditional drugs with new clinical applications are not only commonly found in Western medicines, but also highlighted in Chinese herbal medicines (CHM). For instance, pharmacological studies have revealed that active components or fractions from Chaihu (Radix bupleuri), Hu Zhang (Rhizoma polygoni cuspidati), Donglingcao (Rabdosia rubesens), Hou po (Cortex magnoliae officinalis) and Chuan xiong (Rhizoma chuanxiong) modulate cancers, neurodegeneration and cardiovascular disease via autophagy. These findings shed light on the potential new applications and formulation of CHM decoctions via regulation of autophagy. This article reviews the roles of autophagy in the pharmacological actions of CHM and discusses their new potential clinical applications in various human diseases.
Collapse
Affiliation(s)
- Betty Yuen Kwan Law
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| | - Simon Wing Fai Mok
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| | - An Guo Wu
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| | - Christopher Wai Kei Lam
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| | - Margaret Xin Yi Yu
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| | - Vincent Kam Wai Wong
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, China.
| |
Collapse
|
32
|
Metformin and AICAR regulate NANOG expression via the JNK pathway in HepG2 cells independently of AMPK. Tumour Biol 2016; 37:11199-208. [PMID: 26939902 DOI: 10.1007/s13277-016-5007-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/25/2016] [Indexed: 12/21/2022] Open
Abstract
NANOG, a marker of stemness, impacts tumor progression and therapeutic resistance in cancer cells. In human hepatocellular carcinoma (HCC), upregulation of NANOG is associated with metastasis and a low survival rate, while its downregulation results in a lower colony formation rate and enhanced chemosensitivity. Metformin, an agent widely used for diabetes treatment, and AICAR, another AMP-activated protein kinase (AMPK) activator, have been reported to inhibit the growth of several types of cancer. Although inhibitory effects of metformin on NANOG in pancreatic cancer cells and of AICAR in mouse embryonic stem cells have been described, the underlying molecular mechanisms remain uncertain in HCC. In this study, we used the HepG2 cell line and found that metformin/AICAR downregulated NANOG expression with decreased cell viability and enhanced chemosensitivity to 5-fluorouracil (5-FU). Moreover, metformin/AICAR inhibited c-Jun N-terminal kinase (JNK) activity, and blockade of either the JNK MAPK pathway or knockdown of JNK1 gene expression reduced NANOG levels. The upregulation of NANOG and phospho-JNK by basic fibroblast growth factor (bFGF) was abrogated by metformin/AICAR. Additionally, although transient upregulation of NANOG within 2 h of treatment with metformin/AICAR was concordant with both JNK and AMPK activation, increased NANOG expression with activation of JNK was also observed following AMPK inhibition with compound C. Taken together, our data suggest that metformin/AICAR regulate NANOG expression via the JNK MAPK pathway in HepG2 cells independently of AMPK, and that this JNK/NANOG signaling pathway may offer new therapeutic strategies for the treatment of HCC.
Collapse
|
33
|
Chen H, Wang JP, Santen RJ, Yue W. Adenosine monophosphate activated protein kinase (AMPK), a mediator of estradiol-induced apoptosis in long-term estrogen deprived breast cancer cells. Apoptosis 2016; 20:821-30. [PMID: 25721362 DOI: 10.1007/s10495-015-1111-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Estrogens stimulate growth of hormone-dependent breast cancer but paradoxically induce tumor regress under certain circumstances. We have shown that long-term estrogen deprivation (LTED) enhances the sensitivity of hormone dependent breast cancer cells to estradiol (E2) so that physiological concentrations of estradiol induce apoptosis in these cells. E2-induced apoptosis involve both intrinsic and extrinsic pathways but precise mechanisms remain unclear. We found that exposure of LTED MCF-7 cells to E2 activated AMP activated protein kinase (AMPK). In contrast, E2 inhibited AMPK activation in wild type MCF-7 cells where E2 prevents apoptosis. As a result of AMPK activation, the transcriptional activity of FoxO3, a downstream factor of AMPK, was up-regulated in E2 treatment of LTED. Increased activity of FoxO3 was demonstrated by up-regulation of three FoxO3 target genes, Bim, Fas ligand (FasL), and Gadd45α. Among them, Bim and FasL mediate intrinsic and extrinsic apoptosis respectively and Gadd45α causes cell cycle arrest at the G2/M phase. To further confirm the role of AMPK in apoptosis, we used AMPK activator AICAR in wild type MCF-7 cells and examined apoptosis, proliferation and expression of Bim, FasL, and Gadd45α. The effects of AICAR on these parameters recapitulated those observed in E2-treated LTED cells. Activation of AMPK by AICAR also increased expression of Bax in MCF-7 cells and its localization to mitochondria, which is a required process for apoptosis. These results reveal that AMPK is an important factor mediating E2-induced apoptosis in LTED cells, which is implicative of therapeutic potential for relapsing breast cancer after hormone therapy.
Collapse
Affiliation(s)
- Haiyan Chen
- Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia Health System, P. O. Box 801416, Charlottesville, VA, 22908, USA
| | | | | | | |
Collapse
|
34
|
AMPK Regulation of Cell Growth, Apoptosis, Autophagy, and Bioenergetics. EXPERIENTIA SUPPLEMENTUM (2012) 2016; 107:45-71. [PMID: 27812976 DOI: 10.1007/978-3-319-43589-3_3] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In eukaryotic cells, AMP-activated protein kinase (AMPK) generally promotes catabolic pathways that produce ATP and at the same time inhibits anabolic pathways involved in different processes that consume ATP. As an energy sensor, AMPK is involved in the main cellular functions implicated in cell fate, such as cell growth and autophagy.Recently, AMPK has been connected with apoptosis regulation, although the molecular mechanism by which AMPK induces and/or inhibits cell death is not clear.This chapter reviews the essential role of AMPK in signaling pathways that respond to cellular stress and damage, highlighting the complex and reciprocal regulation between AMPK and their targets and effectors. The therapeutic implications of the role of AMPK in different pathologies such as diabetes, cancer, or mitochondrial dysfunctions are still controversial, and it is necessary to further investigate the molecular mechanisms underlying AMPK activation.
Collapse
|
35
|
Douglas DN, Pu CH, Lewis JT, Bhat R, Anwar-Mohamed A, Logan M, Lund G, Addison WR, Lehner R, Kneteman NM. Oxidative Stress Attenuates Lipid Synthesis and Increases Mitochondrial Fatty Acid Oxidation in Hepatoma Cells Infected with Hepatitis C Virus. J Biol Chem 2015; 291:1974-1990. [PMID: 26627833 DOI: 10.1074/jbc.m115.674861] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Indexed: 12/11/2022] Open
Abstract
Cytopathic effects are currently believed to contribute to hepatitis C virus (HCV)-induced liver injury and are readily observed in Huh7.5 cells infected with the JFH-1 HCV strain, manifesting as apoptosis highly correlated with growth arrest. Reactive oxygen species, which are induced by HCV infection, have recently emerged as activators of AMP-activated protein kinase. The net effect is ATP conservation via on/off switching of metabolic pathways that produce/consume ATP. Depending on the scenario, this can have either pro-survival or pro-apoptotic effects. We demonstrate reactive oxygen species-mediated activation of AMP-activated kinase in Huh7.5 cells during HCV (JFH-1)-induced growth arrest. Metabolic labeling experiments provided direct evidence that lipid synthesis is attenuated, and β-oxidation is enhanced in these cells. A striking increase in nuclear peroxisome proliferator-activated receptor α, which plays a dominant role in the expression of β-oxidation genes after ligand-induced activation, was also observed, and we provide evidence that peroxisome proliferator-activated receptor α is constitutively activated in these cells. The combination of attenuated lipid synthesis and enhanced β-oxidation is not conducive to lipid accumulation, yet cellular lipids still accumulated during this stage of infection. Notably, the serum in the culture media was the only available source for polyunsaturated fatty acids, which were elevated (2-fold) in the infected cells, implicating altered lipid import/export pathways in these cells. This study also provided the first in vivo evidence for enhanced β-oxidation during HCV infection because HCV-infected SCID/Alb-uPA mice accumulated higher plasma ketones while fasting than did control mice. Overall, this study highlights the reprogramming of hepatocellular lipid metabolism and bioenergetics during HCV infection, which are predicted to impact both the HCV life cycle and pathogenesis.
Collapse
Affiliation(s)
- Donna N Douglas
- From the Departments of Surgery,; Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.
| | - Christopher Hao Pu
- From the Departments of Surgery,; Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Jamie T Lewis
- From the Departments of Surgery,; Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | | | | | - Michael Logan
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada; Medical Microbiology and Immunology
| | | | - William R Addison
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada; Medical Microbiology and Immunology
| | | | - Norman M Kneteman
- From the Departments of Surgery,; Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| |
Collapse
|
36
|
Kim SJ, Choung SY. Inhibitory effects of Aster spathulifolius extract on adipogenesis and lipid accumulation in 3T3-L1 preadipocytes. ACTA ACUST UNITED AC 2015; 68:107-18. [PMID: 26471469 DOI: 10.1111/jphp.12485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 07/28/2015] [Indexed: 12/16/2022]
Abstract
OBJECTIVES Aster spathulifolius Maxim (AS), known for its anti-viral and anti-allergic activity, is also known to reduce body weight gain in high fat diet-induced obese rats. But its molecular mechanism of the anti-obesity effects is still unclear. So, we investigated the inhibitory effect of AS extract (ASE) on adipogenesis and lipid accumulation to determine the underlying cellular molecular mechanism. METHODS To perform this study, the contents of intracellular triglyceride were analysed. Real-time polymerase chain reaction and Western blotting were carried out to investigate the expression of adipogenic transcriptional factors. KEY FINDINGS ASE showed the suppression of adipogenic differentiation and the considerable reduction of the lipid accumulation in 3T3-L1 cells. Especially, ASE inhibited the early stage of differentiation via the downregulation of C/EBP-β and C/EBP-δ, which are early adipogenic factors. Major adipogenic factors, such as PPAR-γ and C/EBP-α, were also subsequently inhibited. These findings were supported by Oil Red O staining and intracellular triglyceride levels. A molecular mechanism liking the effect of ASE was identified through the activation of AMPKα pathway. ASE increased protein levels of phosphorylated AMPKα and phosphorylated ACC. CONCLUSIONS ASE showed anti-adipogenic and anti-lipogenic effects through the regulation of adipogenic factors and AMPKα pathway.
Collapse
Affiliation(s)
- Sa-Jic Kim
- Department of Life and Nanopharmaceutical Science of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Se-Young Choung
- Department of Life and Nanopharmaceutical Science of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul, Korea.,Department of Preventive Pharmacy and Toxicology, College of Pharmacy, Kyung Hee University, Seoul, Korea
| |
Collapse
|
37
|
Bodur C, Karakas B, Timucin AC, Tezil T, Basaga H. AMP-activated protein kinase couples 3-bromopyruvate-induced energy depletion to apoptosis via activation of FoxO3a and upregulation of proapoptotic Bcl-2 proteins. Mol Carcinog 2015; 55:1584-1597. [PMID: 26373689 DOI: 10.1002/mc.22411] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Revised: 08/21/2015] [Accepted: 08/31/2015] [Indexed: 01/15/2023]
Abstract
Most tumors primarily rely on glycolysis rather than mitochondrial respiration for ATP production. This phenomenon, also known as Warburg effect, renders tumors more sensitive to glycolytic disturbances compared to normal cells. 3-bromopyruvate is a potent inhibitor of glycolysis that shows promise as an anticancer drug candidate. Although investigations revealed that 3-BP triggers apoptosis through ATP depletion and subsequent AMPK activation, the underlying molecular mechanisms coupling AMPK to apoptosis are poorly understood. We showed that 3-BP leads to a rapid ATP depletion which was followed by growth inhibition and Bax-dependent apoptosis in HCT116 cells. Apoptosis was accompanied with activation of caspase-9 and -3 while pretreatment with a general caspase inhibitor attenuated cell death. AMPK, p38, JNK, and Akt were phosphorylated immediately upon treatment. Pharmacological inhibition and silencing of AMPK largely inhibited 3-BP-induced apoptosis and reversed phosphorylation of JNK. Transcriptional activity of FoxO3a was dramatically increased subsequent to AMPK-mediated phosphorylation of FoxO3a at Ser413. Cell death analysis of cells transiently transfected with wt or AMPK-phosphorylation-deficient FoxO3 expression plasmids verified the contributory role of AMPK-FoxO3a axis in 3-BP-induced apoptosis. In addition, expression of proapoptotic Bcl-2 proteins Bim and Bax were upregulated in an AMPK-dependent manner. Bim was transcriptionally activated in association with FoxO3a activity, while Bax upregulation was abolished in p53-null cells. Together, these data suggest that AMPK couples 3-BP-induced metabolic disruption to intrinsic apoptosis via modulation of FoxO3a-Bim axis and Bax expression. © 2015 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Cagri Bodur
- Molecular Biology, Genetics, and Bioengineering Program, Sabanci University, Tuzla, Istanbul, Turkey.
| | - Bahriye Karakas
- Molecular Biology, Genetics, and Bioengineering Program, Sabanci University, Tuzla, Istanbul, Turkey
| | - Ahmet Can Timucin
- Molecular Biology, Genetics, and Bioengineering Program, Sabanci University, Tuzla, Istanbul, Turkey
| | - Tugsan Tezil
- Molecular Biology, Genetics, and Bioengineering Program, Sabanci University, Tuzla, Istanbul, Turkey
| | - Huveyda Basaga
- Molecular Biology, Genetics, and Bioengineering Program, Sabanci University, Tuzla, Istanbul, Turkey
| |
Collapse
|
38
|
KIM JIHAE, LEE JUNGOK, KIM NAMI, LEE HYEJEONG, LEE YONGWOO, KIM HYUNGIP, KIM SUJIN, PARK SUNHWA, KIM HYEONSOO. Paclitaxel suppresses the viability of breast tumor MCF7 cells through the regulation of EF1α and FOXO3a by AMPK signaling. Int J Oncol 2015; 47:1874-80. [DOI: 10.3892/ijo.2015.3153] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 08/13/2015] [Indexed: 11/06/2022] Open
|
39
|
Panigrahi GK, Yadav A, Srivastava A, Tripathi A, Raisuddin S, Das M. Mechanism of Rhein-Induced Apoptosis in Rat Primary Hepatocytes: Beneficial Effect of Cyclosporine A. Chem Res Toxicol 2015; 28:1133-43. [DOI: 10.1021/acs.chemrestox.5b00063] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gati Krushna Panigrahi
- Food,
Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research—Indian Institute of Toxicology Research (CSIR-IITR), Lucknow 226001, Uttar Pradesh India
- Department
of Medical Elementology and Toxicology, Jamia Hamdard, New Delhi 110062, India
| | - Ashish Yadav
- Food,
Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research—Indian Institute of Toxicology Research (CSIR-IITR), Lucknow 226001, Uttar Pradesh India
| | - Ashish Srivastava
- Food,
Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research—Indian Institute of Toxicology Research (CSIR-IITR), Lucknow 226001, Uttar Pradesh India
| | - Anurag Tripathi
- Food,
Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research—Indian Institute of Toxicology Research (CSIR-IITR), Lucknow 226001, Uttar Pradesh India
| | - S. Raisuddin
- Department
of Medical Elementology and Toxicology, Jamia Hamdard, New Delhi 110062, India
| | - Mukul Das
- Food,
Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research—Indian Institute of Toxicology Research (CSIR-IITR), Lucknow 226001, Uttar Pradesh India
| |
Collapse
|
40
|
Katira A, Tan PH. Adiponectin and its receptor signaling: an anti-cancer therapeutic target and its implications for anti-tumor immunity. Expert Opin Ther Targets 2015; 19:1105-25. [DOI: 10.1517/14728222.2015.1035710] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
41
|
An JY, Zhou LL, Sun P, Pang HG, Li DD, Li Y, Zhang M, Song JN. Role of the AMPK signaling pathway in early brain injury after subarachnoid hemorrhage in rats. Acta Neurochir (Wien) 2015; 157:781-92. [PMID: 25697836 DOI: 10.1007/s00701-015-2370-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 02/05/2015] [Indexed: 12/18/2022]
Abstract
BACKGROUND AMP-activated protein kinase (AMPK) is a key metabolic and stress sensor/effector. Few investigations have been performed to study the role of AMPK in subarachnoid hemorrhage (SAH)-induced early brain injury (EBI). This study was undertaken to investigate the time course of AMPK activation in the early stage of SAH and to evaluate the influence of AICAR (which is known to mimic AMP and activates AMPK) and compound C (a commonly used AMPK inhibitor) on EBI in rats following SAH. METHODS Adult male rats were divided into six groups: control, sham, SAH, SAH + vehicle, SAH + AICAR and SAH + compound C. SAHs were induced by a modified endovascular perforation method. Immunohistochemistry, real-time PCR and Western blot were used to detect the spatial and dynamic expression of AMPK after SAH. Cortical apoptosis and the expressions of apoptosis-related proteins such as FOXO3a (forkhead box, class O, 3a) and Bim (Bcl-2-interacting mediator of cell death) were detected after different drug interventions. RESULTS We found SAH induced prolonged activation of AMPK. Treatment with AICAR markedly induced overactivation of AMPK and upregulation of FOXO3a and Bim. AICAR also significantly exacerbated cerebral apoptosis and neurological impairment following SAH. On the other hand, pre-administration of compound C attenuated EBI in this SAH model by modulating cerebral apoptosis by inhibiting FOXO3a and Bim. CONCLUSIONS Our findings suggest that the AMPK pathway may play an important role in SAH-induced neuronal apoptosis, and the use of AMPK inhibitors can provide neuroprotection in EBI after SAH.
Collapse
Affiliation(s)
- Ji-Yang An
- Department of Neurosurgery, the First Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Wi SM, Lee KY. 5-aminoimidazole-4-carboxamide Riboside Induces Apoptosis Through AMP-activated Protein Kinase-independent and NADPH Oxidase-dependent Pathways. Immune Netw 2014; 14:241-8. [PMID: 25360075 PMCID: PMC4212085 DOI: 10.4110/in.2014.14.5.241] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Revised: 09/15/2014] [Accepted: 09/22/2014] [Indexed: 12/01/2022] Open
Abstract
It is debatable whether AMP-activated protein kinase (AMPK) activation is involved in anti-apoptotic or pro-apoptotic signaling. AICAR treatment increases AMPK-α1 phosphorylation, decreases intracellular reactive oxygen species (ROS) levels, and significantly increases Annexin V-positive cells, DNA laddering, and caspase activity in human myeloid cell. AMPK activation is therefore implicated in apoptosis. However, AMPK-α1-knockdown THP-1 cells are more sensitive to apoptosis than control THP-1 cells are, suggesting that the apoptosis is AMPK-independent. Low doses of AICAR induce cell proliferation, whereas high doses of AICAR suppress cell proliferation. Moreover, these effects are significantly correlated with the downregulation of intracellular ROS, strongly suggesting that AICAR-induced apoptosis is critically associated with the inhibition of NADPH oxidase by AICAR. Collectively, our results demonstrate that in AICAR-induced apoptosis, intracellular ROS levels are far more relevant than AMPK activation.
Collapse
Affiliation(s)
- Sae Mi Wi
- Department of Molecular Cell Biology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| | - Ki-Young Lee
- Department of Molecular Cell Biology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea
| |
Collapse
|
43
|
Dibutyltin promotes oxidative stress and increases inflammatory mediators in BV-2 microglia cells. Toxicol Lett 2014; 230:177-87. [DOI: 10.1016/j.toxlet.2014.03.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 01/29/2014] [Accepted: 03/04/2014] [Indexed: 01/24/2023]
|
44
|
Yu R, Zhang ZQ, Wang B, Jiang HX, Cheng L, Shen LM. Berberine-induced apoptotic and autophagic death of HepG2 cells requires AMPK activation. Cancer Cell Int 2014; 14:49. [PMID: 24991192 PMCID: PMC4079188 DOI: 10.1186/1475-2867-14-49] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Accepted: 04/28/2014] [Indexed: 12/23/2022] Open
Abstract
Background Hepatocellular carcinoma (HCC), the primary liver cancer, is one of the most malignant human tumors with extremely poor prognosis. The aim of this study was to investigate the anti-cancer effect of berberine in a human hepatocellular carcinoma cell line (HepG2), and to study the underlying mechanisms by focusing on the AMP-activated protein kinase (AMPK) signaling cascade. Results We found that berberine induced both apoptotic and autophagic death of HepG2 cells, which was associated with a significant activation of AMPK and an increased expression of the inactive form of acetyl-CoA carboxylase (ACC). Inhibition of AMPK by RNA interference (RNAi) or by its inhibitor compound C suppressed berberine-induced caspase-3 cleavage, apoptosis and autophagy in HepG2 cells, while AICAR, the AMPK activator, possessed strong cytotoxic effects. In HepG2 cells, mammalian target of rapamycin complex 1 (mTORC1) activation was important for cell survival, and berberine inhibited mTORC1 via AMPK activation. Conclusions Together, these results suggested that berberine-induced both apoptotic and autophagic death requires AMPK activation in HepG2 cells.
Collapse
Affiliation(s)
- Rong Yu
- Department of Oncology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China ; Department of Interventional Radiology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China
| | - Zhi-Qing Zhang
- Institute of Neuroscience, Soochow University, Suzhou, Jiangsu 215123, China
| | - Bin Wang
- Department of Oncology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China
| | - Hong-Xin Jiang
- Department of Oncology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China
| | - Lei Cheng
- Department of Interventional Radiology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China
| | - Li-Ming Shen
- Department of Interventional Radiology, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215000, China
| |
Collapse
|
45
|
Russe OQ, Möser CV, Kynast KL, King TS, Olbrich K, Grösch S, Geisslinger G, Niederberger E. LPS inhibits caspase 3-dependent apoptosis in RAW264.7 macrophages induced by the AMPK activator AICAR. Biochem Biophys Res Commun 2014; 447:520-5. [PMID: 24732361 DOI: 10.1016/j.bbrc.2014.04.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 04/06/2014] [Indexed: 12/17/2022]
Abstract
AMP-activated kinase is a cellular energy sensor which is activated in stages of increased ATP consumption. Its activation has been associated with a number of beneficial effects such as decreasing inflammatory processes and the disease progress of diabetes and obesity, respectively. Furthermore, AMPK activation has been linked with induction of cell cycle arrest and apoptosis in cancer and vascular cells, indicating that it might have a therapeutic impact for the treatment of cancer and atherosclerosis. However, the impact of AMPK on the proliferation of macrophages, which also play a key role in the formation of atherosclerotic plaques and in inflammatory processes, has not been focused so far. We have assessed the influence of AICAR- and metformin-induced AMPK activation on cell viability of macrophages with and without inflammatory stimulation, respectively. In cells without inflammatory stimulation, we found a strong induction of caspase 3-dependent apoptosis associated with decreased mTOR levels and increased expression of p21. Interestingly, these effects could be inhibited by co-stimulation with bacterial lipopolysaccharide (LPS) but not by other proinflammatory cytokines suggesting that AICAR induces apoptosis via AMPK in a TLR4-pathway dependent manner. In conclusion, our results revealed that AMPK activation is not only associated with positive effects but might also contribute to risk factors by disturbing important features of macrophages. The fact that LPS is able to restore AMPK-associated apoptosis might indicate an important role of TLR4 agonists in preventing unfavorable cell death of immune cells.
Collapse
Affiliation(s)
- Otto Quintus Russe
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Christine V Möser
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Katharina L Kynast
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Tanya S King
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Katrin Olbrich
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Sabine Grösch
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Gerd Geisslinger
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| | - Ellen Niederberger
- pharmazentrum frankfurt/ZAFES, Institut für Klinische Pharmakologie, Klinikum der Goethe-Universität Frankfurt, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.
| |
Collapse
|
46
|
González-Gironès DM, Moncunill-Massaguer C, Iglesias-Serret D, Cosialls AM, Pérez-Perarnau A, Palmeri CM, Rubio-Patiño C, Villunger A, Pons G, Gil J. AICAR induces Bax/Bak-dependent apoptosis through upregulation of the BH3-only proteins Bim and Noxa in mouse embryonic fibroblasts. Apoptosis 2014; 18:1008-16. [PMID: 23605481 DOI: 10.1007/s10495-013-0850-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
5-Aminoimidazole-4-carboxamide (AICA) riboside (AICAR) is a nucleoside analogue that is phosphorylated to 5-amino-4-imidazolecarboxamide ribotide (ZMP), which acts as an AMP mimetic and activates AMP-activated protein kinase (AMPK). It has been recently described that AICAR triggers apoptosis in chronic lymphocytic leukemia (CLL) cells, and its mechanism of action is independent of AMPK as well as p53. AICAR-mediated upregulation of the BH3-only proteins BIM and NOXA correlates with apoptosis induction in CLL cells. Here we propose mouse embryonic fibroblasts (MEFs) as a useful model to analyze the mechanism of AICAR-induced apoptosis. ZMP formation was required for AICAR-induced apoptosis, though direct Ampk activation with A-769662 failed to induce apoptosis in MEFs. AICAR potently induced apoptosis in Ampkα1 (-/-) /α2 (-/-) MEFs, demonstrating an Ampk-independent mechanism of cell death activation. In addition, AICAR acts independently of p53, as MEFs lacking p53 also underwent apoptosis normally. Notably, MEFs lacking Bax and Bak were completely resistant to AICAR-induced apoptosis, confirming the involvement of the mitochondrial pathway in its mechanism of action. Apoptosis was preceded by ZMP-dependent but Ampk-independent modulation of the mRNA levels of different Bcl-2 family members, including Noxa, Bim and Bcl-2. Bim protein levels were accumulated upon AICAR treatment of MEFs, suggesting its role in the apoptotic process. Strikingly, MEFs lacking both Bim and Noxa displayed high resistance to AICAR. These findings support the notion that MEFs are a useful system to further dissect the mechanism of AICAR-induced apoptosis.
Collapse
Affiliation(s)
- Diana M González-Gironès
- Departament de Ciències Fisiològiques II, Institut d'Investigació Biomèdica de Bellvitge IDIBELL-Universitat de Barcelona, Campus de Bellvitge, Pavelló de Govern, 4ª planta, L'Hospitalet de Llobregat, 08907 Barcelona, Catalonia, Spain
| | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Modulation of cyclins, p53 and mitogen-activated protein kinases signaling in breast cancer cell lines by 4-(3,4,5-trimethoxyphenoxy)benzoic acid. Int J Mol Sci 2014; 15:743-57. [PMID: 24406729 PMCID: PMC3907835 DOI: 10.3390/ijms15010743] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 12/23/2013] [Accepted: 12/30/2013] [Indexed: 12/20/2022] Open
Abstract
Despite the advances in cancer therapy and early detection, breast cancer remains a leading cause of cancer-related deaths among females worldwide. The aim of the current study was to investigate the antitumor activity of a novel compound, 4-(3,4,5-trimethoxyphenoxy)benzoic acid (TMPBA) and its mechanism of action, in breast cancer. Results indicated the relatively high sensitivity of human breast cancer cell-7 and MDA-468 cells towards TMPBA with IC50 values of 5.9 and 7.9 μM, respectively compared to hepatocarcinoma cell line Huh-7, hepatocarcinoma cell line HepG2, and cervical cancer cell line Hela cells. Mechanistically, TMPBA induced apoptotic cell death in MCF-7 cells as indicated by 4′,6-diamidino-2-phenylindole (DAPI) nuclear staining, cell cycle analysis and the activation of caspase-3. Western blot analysis revealed the ability of TMPBA to target pathways mediated by mitogen-activated protein (MAP) kinases, 5′ adenosine monophosphate-activated protein kinase (AMPK), and p53, of which the concerted action underlined its antitumor efficacy. In addition, TMPBA induced alteration of cyclin proteins’ expression and consequently modulated the cell cycle. Taken together, the current study underscores evidence that TMPBA induces apoptosis in breast cancer cells via the modulation of cyclins and p53 expression as well as the modulation of AMPK and mitogen-activated protein kinases (MAPK) signaling. These findings support TMPBA’s clinical promise as a potential candidate for breast cancer therapy.
Collapse
|
48
|
Li KR, Zhang ZQ, Yao J, Zhao YX, Duan J, Cao C, Jiang Q. Ginsenoside Rg-1 protects retinal pigment epithelium (RPE) cells from cobalt chloride (CoCl2) and hypoxia assaults. PLoS One 2013; 8:e84171. [PMID: 24386346 PMCID: PMC3873980 DOI: 10.1371/journal.pone.0084171] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Accepted: 11/20/2013] [Indexed: 12/25/2022] Open
Abstract
Severe retinal ischemia causes persistent visual impairments in eye diseases. Retinal pigment epithelium (RPE) cells are located near the choroidal capillaries, and are easily affected by ischemic or hypoxia. Ginsenoside Rg-1 has shown significant neuroprotective effects. This study was performed to test the cytoprotective effect of ginsenoside Rg-1 in RPE cells against hypoxia and cobalt chloride (CoCl2) assaults, and to understand the underlying mechanisms. We found that Rg-1 pre-administration significantly inhibited CoCl2- and hypoxia-induced RPE cell death and apoptosis. Reactive oxygen specisis (ROS)-dependent p38 and c-Jun NH(2)-terminal kinases (JNK) MAPK activation was required for CoCl2-induced RPE cell death, and Rg-1 pre-treatment significantly inhibited ROS production and following p38/JNK activation. Further, CoCl2 suppressed pro-survival mTOR complex 1 (mTORC1) activation in RPE cells through activating of AMP-activated protein kinase (AMPK), while Rg-1 restored mTORC1 activity through inhibiting AMPK activation. CoCl2-induced AMPK activation was also dependent on ROS production, and anti-oxidant N-acetylcysteine (NAC) prevented AMPK activation and RPE cell death by CoCl2. Our results indicated that Rg-1 could be further investigated as a novel cell-protective agent for retinal ischemia.
Collapse
Affiliation(s)
- Ke-ran Li
- Department of Eye, the Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Zhi-qing Zhang
- Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, China
| | - Jin Yao
- Department of Eye, the Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yu-xia Zhao
- Department of Eye, the Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Jing Duan
- The Center for Safety Evaluation of Drugs, Academic Institute of Pharmaceutical Science, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Cong Cao
- Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, China
| | - Qin Jiang
- Department of Eye, the Affiliated Eye Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| |
Collapse
|
49
|
Pisanti S, Picardi P, Ciaglia E, Margarucci L, Ronca R, Giacomini A, Malfitano AM, Casapullo A, Laezza C, Gazzerro P, Bifulco M. Antiangiogenic effects of N6-isopentenyladenosine, an endogenous isoprenoid end product, mediated by AMPK activation. FASEB J 2013; 28:1132-44. [PMID: 24265487 DOI: 10.1096/fj.13-238238] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
N6-isopentenyladenosine (iPA), an end product of the mevalonate pathway with an isopentenyl chain, is already known to exert a suppressor effect against various tumors. In this work, we investigated whether iPA also directly interferes with the angiogenic process, which is fundamental to tumor growth and progression. To this end, using human umbilical vein endothelial cells (HUVECs) as a suitable in vitro model of angiogenesis, we evaluated their viability, proliferation, migration, invasion, tube formation in response to iPA, and molecular mechanisms involved. Data were corroborated in mice by using a gel plug assay. iPA dose- and time-dependently inhibited all the neoangiogenesis stages, with an IC50 of 0.98 μM. We demonstrated for the first time, by liquid chromatography-coupled tandem mass spectrometry (LC-MS/MS), that iPA was monophosphorylated into 5'-iPA-monophosphate (iPAMP) by the adenosine kinase (ADK) inside the cells. iPAMP is the active form that inhibits angiogenesis through the direct activation of AMP-kinase (AMPK). Indeed, all effects were completely reversed by pretreatment with 5-iodotubercidin (5-Itu), an ADK inhibitor. The isoprenoid intermediate isopentenyl pyrophosphate (IPP), which shares the isopentenyl moiety with iPA, was ineffective in the inhibition of angiogenesis, thus showing that the iPA structure is specific for the observed effects. In conclusion, iPA is a novel AMPK activator and could represent a useful tool for the treatment of diseases where excessive neoangiogenesis is the underlying pathology.
Collapse
Affiliation(s)
- Simona Pisanti
- 2University of Salerno, Via Giovanni Paolo II, 84084 Fisciano, Salerno, Italy. S.P.,
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Son HS, Kwon HY, Sohn EJ, Lee JH, Woo HJ, Yun M, Kim SH, Kim YC. Activation of AMP-activated protein kinase and phosphorylation of glycogen synthase kinase3 β mediate ursolic acid induced apoptosis in HepG2 liver cancer cells. Phytother Res 2013; 27:1714-22. [PMID: 23325562 DOI: 10.1002/ptr.4925] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 12/10/2012] [Accepted: 12/13/2012] [Indexed: 12/16/2023]
Abstract
Despite the antitumour effect of ursolic acid observed in several cancers, the underlying mechanism remains unclear. Thus, in the present study, the roles of AMP-activated protein kinase (AMPK) and glycogen synthase kinase 3 beta (GSK3β) were examined in ursolic acid induced apoptosis in HepG2 hepatocellular carcinoma cells. Ursolic acid significantly exerted cytotoxicity, increased the sub-G1 population and the number of ethidium homodimer and terminal deoxynucleotidyl transferase(TdT) mediated dUTP nick end labeling positive cells in HepG2 cells. Also, ursolic acid enhanced the cleavages of poly-ADP-ribose polymerase (PARP) and caspase3, attenuated the expression of astrocyte elevated gene (AEG1) and survivin in HepG2 cells. Interestingly, ursolic acid increased the phosphorylation of AMPK and coenzyme A carboxylase and also enhanced phosphorylation of GSK3β at inactive form serine 9, whereas ursolic acid attenuated the phosphorylation of AKT and mTOR in HepG2 cells. Conversely, AMPK inhibitor compound C or GSK3β inhibitor SB216763 blocked the cleavages of PARP and caspase 3 induced by ursolic acid in HepG2 cells. Furthermore, proteosomal inhibitor MG132 suppressed AMPK activation, GSK3β phosphorylation, cleaved PARP and deceased AEG-1 induced by ursolic acid in HepG2 cells. Overall, our findings suggest that ursolic acid induced apoptosis in HepG2 cells via AMPK activation and GSK3β phosphorylation as a potent chemopreventive agent.
Collapse
Affiliation(s)
- Hyun-Soo Son
- College of Oriental Medicine, Kyung Hee University, Seoul, 130-701, Korea
| | | | | | | | | | | | | | | |
Collapse
|