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Asejeje FO, Akinola KD, Abiola MA. Sodium benzoate exacerbates hepatic oxidative stress and inflammation in lipopolysaccharide-induced liver injury in rats. Immunopharmacol Immunotoxicol 2023; 45:558-564. [PMID: 36927185 DOI: 10.1080/08923973.2023.2191818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 03/12/2023] [Indexed: 03/18/2023]
Abstract
BACKGROUND Liver damage is a global health concern associated with a high mortality rate. Sodium benzoate (SB) is a widely used preservative in the food industry with a wide range of applications. However, there's a lack of scientific reports on its effect on lipopolysaccharide-induced hepatic dysfunction. OBJECTIVE The present study investigated the influence of SB on lipopolysaccharide (LPS)-induced liver injury. MATERIALS AND METHODS Twenty-eight rats were randomly allocated into four groups: control (received distilled water), SB (received 600 mg/kg), LPS (received 0.25 mg/kg), and LPS + SB (received LPS, 0.25 mg/kg, and SB, 600 mg/kg). SB was administered orally for 14 days while LPS was administered intraperitoneally for 7 days. RESULTS Administration of SB to rats with hepatocyte injury exacerbated liver damage with a significant increase in the activities of serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP). We also observed that SB aggravated LPS-mediated hepatic oxidative stress occasioned by a marked decrease in antioxidant status with a concomitant increase in lipid peroxidation. Furthermore, LPS - mediated increase in inflammatory biomarkers as well as histological deterioration in the liver was exacerbated following the administration of SB to rats. CONCLUSION Taken together, the study provides experimental evidence that SB exacerbates hepatic oxidative stress and inflammation in LPS-mediated liver injury.
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Affiliation(s)
- Folake Olubukola Asejeje
- Department of Chemical Sciences, Faculty of Natural Sciences, Ajayi Crowther University, Oyo, Nigeria
| | - Khalid Damilare Akinola
- Department of Chemical Sciences, Faculty of Natural Sciences, Ajayi Crowther University, Oyo, Nigeria
| | - Michael Abayomi Abiola
- Department of Chemical Sciences, Faculty of Natural Sciences, Ajayi Crowther University, Oyo, Nigeria
- Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI, USA
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2
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Rai S, Tapadia MG. Hsc70-4 aggravates PolyQ-mediated neurodegeneration by modulating NF-κB mediated immune response in Drosophila. Front Mol Neurosci 2022; 15:857257. [PMID: 36425218 PMCID: PMC9678916 DOI: 10.3389/fnmol.2022.857257] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 10/11/2022] [Indexed: 10/06/2023] Open
Abstract
Huntington's disease occurs when the stretch of CAG repeats in exon 1 of the huntingtin (htt) gene crosses the permissible limit, causing the mutated protein (mHtt) to form insoluble aggregates or inclusion bodies. These aggregates are non-typically associated with various essential proteins in the cells, thus disrupting cellular homeostasis. The cells try to bring back normalcy by synthesizing evolutionary conserved cellular chaperones, and Hsp70 is one of the families of heat shock proteins that has a significant part in this, which comprises of heat-inducible and cognate forms. Here, we demonstrate that the heat shock cognate (Hsc70) isoform, Hsc70-4/HSPA8, has a distinct role in polyglutamate (PolyQ)-mediated pathogenicity, and its expression is enhanced in the polyQ conditions in Drosophila. Downregulation of hsc70-4 rescues PolyQ pathogenicity with a notable improvement in the ommatidia arrangement and near-normal restoration of optic neurons leading to improvement in phototaxis response. Reduced hsc70-4 also attenuates the augmented immune response by decreasing the expression of NF-κB and the antimicrobial peptides, along with that JNK overactivation is also restored. These lead to the rescue of the photoreceptor cells, indicating a decrease in the caspase activity, thus reverting the PolyQ pathogenicity. At the molecular level, we show the interaction between Hsc70-4, Polyglutamine aggregates, and NF-κB, which may be responsible for the dysregulation of signaling molecules in polyQ conditions. Thus, the present data provides a functional link between Hsc70-4 and NF-κB under polyQ conditions.
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Affiliation(s)
| | - Madhu G. Tapadia
- Cytogenetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi, Uttar Pradesh, India
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3
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Karmazyn M, Pierce GN, Fliegel L. The Remaining Conundrum of the Role of the Na +/H + Exchanger Isoform 1 (NHE1) in Cardiac Physiology and Pathology: Can It Be Rectified? Rev Cardiovasc Med 2022; 23:284. [PMID: 39076631 PMCID: PMC11266974 DOI: 10.31083/j.rcm2308284] [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: 06/08/2022] [Revised: 06/29/2022] [Accepted: 07/08/2022] [Indexed: 07/31/2024] Open
Abstract
The mammalian Na + /H + exchanger (NHE) is a family of ubiquitous membrane proteins present in humans. Isoform one (NHE1) is present on the plasma membrane and regulates intracellular pH by removal of one intracellular proton in exchange for one extracellular sodium thus functioning as an electroneutral process. Human NHE1 has a 500 amino acid membrane domain plus a C-terminal 315 amino acid, regulatory cytosolic tail. It is regulated through a cytosolic regulatory C-terminal tail which is subject to phosphorylation and is modulated by proteins and lipids. Substantial evidence has implicated NHE1 activity in both myocardial ischemia and reperfusion damage and myocardial remodeling resulting in heart failure. Experimental data show excellent cardioprotection with NHE1 inhibitors although results from clinical results have been mixed. In cardiac surgery patients receiving the NHE1 inhibitor cariporide, subgroups showed beneficial effects of treatment. However, in one trial this was associated with a significantly increased incidence of ischemic strokes. This likely reflected both inappropriate dosing regimens as well as overly high drug doses. We suggest that further progress towards NHE1 inhibition as a treatment for cardiovascular disease is warranted through the development of novel compounds to inhibit NHE1 that are structurally different than those previously used in compromised clinical trials. Some novel pyrazinoyl guanidine inhibitors of NHE1 are already in development and the recent elucidation of the three-dimensional structure of the NHE1 protein and identity of the inhibitor binding site may facilitate development. An alternative approach may also be to control the endogenous regulation of activity of NHE1, which is activated in disease.
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Affiliation(s)
- Morris Karmazyn
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Grant N. Pierce
- Institute of Cardiovascular Sciences, Albrechtsen Research Centre, St. Boniface Hospital, and Department of Physiology and Pathophysiology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R2H 2A6, Canada
| | - Larry Fliegel
- Department of Biochemistry, University Alberta, Edmonton, AB T6G 2H7, Canada
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4
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Yang J, Liu Z, Perrett S, Zhang H, Pan Z. PES derivative PESA is a potent tool to globally profile cellular targets of PES. Bioorg Med Chem Lett 2022; 60:128553. [PMID: 35051576 DOI: 10.1016/j.bmcl.2022.128553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/12/2022] [Accepted: 01/12/2022] [Indexed: 11/16/2022]
Abstract
PES (2-phenylethynesulfonamide, pifithrin-μ, PFTμ) is an electrophilic compound that exhibits anticancer properties, protects against chemotherapy-induced peripheral neuropathy in chemotherapy, and shows immunomodulatory, anti-inflammatory and anti-viral activities. PES generally shows higher cytotoxicity towards tumor cells than non-tumor cells. The mechanism of action of PES is unclear but may involve the covalent modification of proteins as PES has been found to be a covalent inhibitor of Hsp70. We developed a new PES derivative PESA with a terminal alkynyl group to perform click-reaction-assisted activity-based protein profiling (click-reaction ABPP) and used this to screen for cellular targets of PES. We found PES and its derivatives PES-Cl and PESA have comparable ability to undergo a Michael addition reaction with GSH and Hsp70, and showed similar cytotoxicity. By fluorescence imaging and proteomics studies we identified over 300 PESA-attached proteins in DOHH2 cells. Some proteins involved in cancer-related redox processes, such as peroxiredoxin 1 (PRDX1), showed higher frequency and abundance in mass spectrometry detection. Our results suggest that cytotoxicity of PES and its derivatives may be related to attack of protein thiols and cellular GSH resulting in breakdown of cellular redox homeostasis. This study provides a powerful new tool compound within the PES class of bioactive compounds and gives insight into the working mechanisms of PES and its derivatives.
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Affiliation(s)
- Jie Yang
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Zhenyan Liu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District Beijing 100101, China
| | - Sarah Perrett
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District Beijing 100101, China; University of the Chinese Academy of Sciences, 19 Yuquan Road Shijingshan District, Beijing 100049, China
| | - Hong Zhang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District Beijing 100101, China; University of the Chinese Academy of Sciences, 19 Yuquan Road Shijingshan District, Beijing 100049, China.
| | - Zhengying Pan
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen 518055, China.
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5
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Effect of heat shock protein 70 modulators on the development of morphine analgesic tolerance in rats. Behav Pharmacol 2020; 31:179-185. [PMID: 31770112 PMCID: PMC7077967 DOI: 10.1097/fbp.0000000000000528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The clinical use of opioid analgesics, such as morphine, is limited by analgesic tolerance, molecular mechanism of which is not well understood. Recently, molecular chaperone heat shock protein 70 (Hsp70) has been demonstrated to play important roles in morphine-induced neuroadaptation. Here, we focused on the involvement of Hsp70 in the development of analgesic tolerance to morphine. Rats were treated with morphine (5, 10, 20 mg/kg, subcutaneously) or saline once daily for 10 consecutive days. Hsp70 modulator N-formyl-3, 4-methylenedioxybenzylidine-γ-butyrolactam [KNK437, 100 mg/kg, intraperitoneally (i.p.)], geranylgeranylacetone (500 mg/kg, i.p.) or pifithrin-μ (20 mg/kg, i.p.) was administered before morphine (10 mg/kg, subcutaneously)/saline treatment. Analgesic effect of morphine was measured using the tail-flick latency test, and Hsp70 protein expression was examined by western blot. Analgesic effect of morphine decreased gradually with the increase in the number of days of morphine injection, indicating development of analgesic tolerance. A significant increase of Hsp70 expression in the periaqueductal gray was observed during the development of analgesic tolerance after repeated morphine injections. The development of morphine analgesic tolerance was suppressed by pre-treatment with Hsp70 transcriptional inhibitor KNK437 or functional antagonist pifithrin-μ, while promoted by pre-treatment with Hsp70 transcriptional inducer geranylgeranylacetone. Our results demonstrated that the development of morphine analgesic tolerance was dual regulated by Hsp70 modulators, suggesting Hsp70 as an interesting and new target for preventing the development of opioid analgesic tolerance.
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Barnoud T, Leung JC, Leu JIJ, Basu S, Poli ANR, Parris JLD, Indeglia A, Martynyuk T, Good M, Gnanapradeepan K, Sanseviero E, Moeller R, Tang HY, Cassel J, Kossenkov AV, Liu Q, Speicher DW, Gabrilovich DI, Salvino JM, George DL, Murphy ME. A Novel Inhibitor of HSP70 Induces Mitochondrial Toxicity and Immune Cell Recruitment in Tumors. Cancer Res 2020; 80:5270-5281. [PMID: 33023943 DOI: 10.1158/0008-5472.can-20-0397] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 08/24/2020] [Accepted: 10/02/2020] [Indexed: 12/13/2022]
Abstract
The protein chaperone HSP70 is overexpressed in many cancers including colorectal cancer, where overexpression is associated with poor survival. We report here the creation of a uniquely acting HSP70 inhibitor (HSP70i) that targets multiple compartments in the cancer cell, including mitochondria. This inhibitor was mitochondria toxic and cytotoxic to colorectal cancer cells, but not to normal colon epithelial cells. Inhibition of HSP70 was efficacious as a single agent in primary and metastatic models of colorectal cancer and enabled identification of novel mitochondrial client proteins for HSP70. In a syngeneic colorectal cancer model, the inhibitor increased immune cell recruitment into tumors. Cells treated with the inhibitor secreted danger-associated molecular patterns (DAMP), including ATP and HMGB1, and functioned effectively as a tumor vaccine. Interestingly, the unique properties of this HSP70i in the disruption of mitochondrial function and the inhibition of proteostasis both contributed to DAMP release. This HSP70i constitutes a promising therapeutic opportunity in colorectal cancer and may exhibit antitumor activity against other tumor types. SIGNIFICANCE: These findings describe a novel HSP70i that disrupts mitochondrial proteostasis, demonstrating single-agent efficacy that induces immunogenic cell death in treated tumors.
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Affiliation(s)
- Thibaut Barnoud
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Jessica C Leung
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Julia I-Ju Leu
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Subhasree Basu
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Adi Narayana Reddy Poli
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Joshua L D Parris
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania.,Department of Graduate Group in Cell and Molecular Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Alexandra Indeglia
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania.,Department of Biochemistry and Molecular Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Tetyana Martynyuk
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Madeline Good
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Keerthana Gnanapradeepan
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania.,Department of Biochemistry and Molecular Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Emilio Sanseviero
- Program in Immunology, Metastasis and Microenvironment, The Wistar Institute, Philadelphia, Pennsylvania
| | - Rebecca Moeller
- Drexel University College of Medicine, Philadelphia, Pennsylvania
| | - Hsin-Yao Tang
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Joel Cassel
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Andrew V Kossenkov
- Program in Gene Expression and Regulation, The Wistar Institute, Philadelphia, Pennsylvania
| | - Qin Liu
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - David W Speicher
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania
| | - Dmitry I Gabrilovich
- Department of Graduate Group in Cell and Molecular Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Joseph M Salvino
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania.
| | - Donna L George
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Maureen E Murphy
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania.
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7
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Li T, Tuo B. Pathophysiology of hepatic Na +/H + exchange (Review). Exp Ther Med 2020; 20:1220-1229. [PMID: 32742358 PMCID: PMC7388279 DOI: 10.3892/etm.2020.8888] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 05/15/2020] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers (NHEs) are a family of membrane proteins that contribute to exchanging one intracellular proton for one extracellular sodium. The family of NHEs consists of nine known members, NHE1-9. Each isoform represents a different gene product that has unique tissue expression, membrane localization, physiological effects, pathological regulation and sensitivity to drug inhibitors. NHE1 was the first to be discovered and is often referred to as the 'housekeeping' isoform of the NHE family. NHEs are not only involved in a variety of physiological processes, including the control of transepithelial Na+ absorption, intracellular pH, cell volume, cell proliferation, migration and apoptosis, but also modulate complex pathological events. Currently, the vast majority of review articles have focused on the role of members of the NHE family in inflammatory bowel disease, intestinal infectious diarrhea and digestive system tumorigenesis, but only a few reviews have discussed the role of NHEs in liver disease. Therefore, the present review described the basic biology of NHEs and highlighted their physiological and pathological effects in the liver.
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Affiliation(s)
- Tingting Li
- Department of Gastroenterology, Affiliated Hospital, Zunyi Medical University, Zunyi, Guizhou 563000, P.R. China
| | - Biguang Tuo
- Department of Gastroenterology, Affiliated Hospital, Zunyi Medical University, Zunyi, Guizhou 563000, P.R. China
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8
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Yoon S, Kim M, Min HK, Lee YU, Kwon DH, Lee M, Lee S, Kook T, Joung H, Nam KI, Ahn Y, Kim YK, Kim J, Park WJ, McMullen JR, Eom GH, Kook H. Inhibition of heat shock protein 70 blocks the development of cardiac hypertrophy by modulating the phosphorylation of histone deacetylase 2. Cardiovasc Res 2020; 115:1850-1860. [PMID: 30596969 DOI: 10.1093/cvr/cvy317] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/22/2018] [Accepted: 12/21/2018] [Indexed: 11/14/2022] Open
Abstract
AIMS Previously, we reported that phosphorylation of histone deacetylase 2 (HDAC2) and the resulting activation causes cardiac hypertrophy. Through further study of the specific binding partners of phosphorylated HDAC2 and their mechanism of regulation, we can better understand how cardiac hypertrophy develops. Thus, in the present study, we aimed to elucidate the function of one such binding partner, heat shock protein 70 (HSP70). METHODS AND RESULTS Primary cultures of rat neonatal ventricular cardiomyocytes and H9c2 cardiomyoblasts were used for in vitro cellular experiments. HSP70 knockout (KO) mice and transgenic (Tg) mice that overexpress HSP70 in the heart were used for in vivo analysis. Peptide-precipitation and immunoprecipitation assay revealed that HSP70 preferentially binds to phosphorylated HDAC2 S394. Forced expression of HSP70 increased phosphorylation of HDAC2 S394 and its activation, but not that of S422/424, whereas knocking down of HSP70 reduced it. However, HSP70 failed to phosphorylate HDAC2 in the cell-free condition. Phosphorylation of HDAC2 S394 by casein kinase 2α1 enhanced the binding of HSP70 to HDAC2, whereas dephosphorylation induced by the catalytic subunit of protein phosphatase 2A (PP2CA) had the opposite effect. HSP70 prevented HDAC2 dephosphorylation by reducing the binding of HDAC2 to PP2CA. HSP70 KO mouse hearts failed to phosphorylate S394 HDAC2 in response to isoproterenol infusion, whereas Tg overexpression of HSP70 increased the phosphorylation and activation of HDAC2. 2-Phenylethynesulfonamide (PES), an HSP70 inhibitor, attenuated cardiac hypertrophy induced either by phenylephrine in neonatal ventricular cardiomyocytes or by aortic banding in mice. PES reduced HDAC2 S394 phosphorylation and its activation by interfering with the binding of HSP70 to HDAC2. CONCLUSION These results demonstrate that HSP70 specifically binds to S394-phosphorylated HDAC2 and maintains its phosphorylation status, which results in HDAC2 activation and the development of cardiac hypertrophy. Inhibition of HSP70 has possible application as a therapeutic.
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MESH Headings
- Animals
- Binding Sites
- Cell Line
- Disease Models, Animal
- Enzyme Activation
- HSP70 Heat-Shock Proteins/antagonists & inhibitors
- HSP70 Heat-Shock Proteins/deficiency
- HSP70 Heat-Shock Proteins/genetics
- HSP70 Heat-Shock Proteins/metabolism
- Histone Deacetylase 2/metabolism
- Hypertrophy, Left Ventricular/enzymology
- Hypertrophy, Left Ventricular/genetics
- Hypertrophy, Left Ventricular/physiopathology
- Hypertrophy, Left Ventricular/prevention & control
- Mice, Inbred C57BL
- Mice, Knockout
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/pathology
- Phosphorylation
- Protein Binding
- Protein Phosphatase 2/metabolism
- Rats
- Rats, Sprague-Dawley
- Signal Transduction
- Sulfonamides/pharmacology
- Ventricular Function, Left/drug effects
- Ventricular Remodeling/drug effects
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Affiliation(s)
- Somy Yoon
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Mira Kim
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Hyun-Ki Min
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Yeong-Un Lee
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Duk-Hwa Kwon
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Miyoung Lee
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
- College of Life Science, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea
| | - Sumin Lee
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Taewon Kook
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Hosouk Joung
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Kwang-Il Nam
- Department of Anatomy, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Youngkeun Ahn
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Young-Kook Kim
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
- Department of Biochemistry, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Jaetaek Kim
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
- Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Woo Jin Park
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
- College of Life Science, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea
| | - Julie R McMullen
- Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Gwang Hyeon Eom
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Medical Research Center for Gene Regulation, Chonnam National University Medical School, Hwasun, Republic of Korea
| | - Hyun Kook
- Department of Pharmacology, Chonnam National University Medical School, Hwasun, Republic of Korea
- Cardiac Remodeling Research Center, Chonnam National University Medical School, Hwasun, Republic of Korea
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9
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Pedersen SF, Counillon L. The SLC9A-C Mammalian Na +/H + Exchanger Family: Molecules, Mechanisms, and Physiology. Physiol Rev 2019; 99:2015-2113. [PMID: 31507243 DOI: 10.1152/physrev.00028.2018] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers play pivotal roles in the control of cell and tissue pH by mediating the electroneutral exchange of Na+ and H+ across cellular membranes. They belong to an ancient family of highly evolutionarily conserved proteins, and they play essential physiological roles in all phyla. In this review, we focus on the mammalian Na+/H+ exchangers (NHEs), the solute carrier (SLC) 9 family. This family of electroneutral transporters constitutes three branches: SLC9A, -B, and -C. Within these, each isoform exhibits distinct tissue expression profiles, regulation, and physiological roles. Some of these transporters are highly studied, with hundreds of original articles, and some are still only rudimentarily understood. In this review, we present and discuss the pioneering original work as well as the current state-of-the-art research on mammalian NHEs. We aim to provide the reader with a comprehensive view of core knowledge and recent insights into each family member, from gene organization over protein structure and regulation to physiological and pathophysiological roles. Particular attention is given to the integrated physiology of NHEs in the main organ systems. We provide several novel analyses and useful overviews, and we pinpoint main remaining enigmas, which we hope will inspire novel research on these highly versatile proteins.
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Affiliation(s)
- S F Pedersen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
| | - L Counillon
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
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10
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Ye Y, Jia X, Bajaj M, Birnbaum Y. Dapagliflozin Attenuates Na +/H + Exchanger-1 in Cardiofibroblasts via AMPK Activation. Cardiovasc Drugs Ther 2019; 32:553-558. [PMID: 30367338 DOI: 10.1007/s10557-018-6837-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE We assessed whether the SGLT-2 inhibitor dapagliflozin (Dapa) attenuates the upregulation of the cardiac Na+/H+ exchanger (NHE-1) in vitro in mouse cardiofibroblasts stimulated with lipopolysaccharides (LPS) and whether this effect is dependent on adenosine monophosphate kinase (AMPK) activation. METHODS Mouse cardiofibroblasts were exposed for 16 h to Dapa (0.4 μM), AMPK activator (A769662 (10 μM)), AMPK inhibitor (compound C (CC) (10 μM)), an SGLT-1 and SGLT-2 inhibitor (phlorizin (PZ) (100 μM)), Dapa+CC, or Dapa+PZ, and then stimulated with LPS (10 ng/ml) for 3 h. NHE-1 mRNA levels were assessed by rt-PCR and total AMPK, phosphorylated-AMPK (P-AMPK), NHE-1, and heat shock protein-70 (Hsp70) protein levels in the whole cell lysate by immunoblotting. In addition, NHE-1 protein levels attached to Hsp70 were assessed by immunoprecipitation. RESULTS Exposure to LPS significantly reduced P-AMPK levels in the cardiofibroblasts. A769662 and Dapa equally increased P-AMPK. The effect was blocked by CC. Phlorizin had no effect on P-AMPK. LPS exposure significantly increased NHE-1 mRNA levels. Both Dapa and A769662 equally attenuated this increase. The effect of Dapa was blocked with CC. Interestingly, none of the compounds significantly affected NHE-1 and Hsp70 protein levels in the whole cell lysate. However, LPS significantly increased the concentration of NHE-1 attached to Hsp70. Both Dapa and A69662 attenuated this association and CC blocked the effect of Dapa. Again, phlorizin had no effect and did not alter the effect of Dapa. CONCLUSIONS Dapa increases P-AMPK in cardiofibroblasts exposed to LPS. Dapa attenuated the increase in NHE-1 mRNA and the association between NHE-1 and Hsp70. This effect was dependent on AMPK.
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Affiliation(s)
- Yumei Ye
- The Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, USA
| | - Xiaoming Jia
- The Section of Cardiology, The Department of Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Mandeep Bajaj
- The Section of Endocrinology, The Department of Medicine, Baylor College of Medicine, Houston, TX, USA
| | - Yochai Birnbaum
- The Section of Cardiology, The Department of Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.
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11
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Sun Y, Gu J, Liu R, Zhou H, Lu L, Dai X, Qian X. IL‐2/IL‐6 ratio correlates with liver function and recovery in acute liver injury patients. APMIS 2019; 127:468-474. [PMID: 30802326 DOI: 10.1111/apm.12944] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 02/07/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Yu Sun
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Jian Gu
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Rui Liu
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Haoming Zhou
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Ling Lu
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Xinzheng Dai
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
| | - Xiaofeng Qian
- Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University Nanjing China
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12
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Natural Compound Oridonin Inhibits Endotoxin-Induced Inflammatory Response of Activated Hepatic Stellate Cells. BIOMED RESEARCH INTERNATIONAL 2018; 2018:6137420. [PMID: 30687752 PMCID: PMC6330820 DOI: 10.1155/2018/6137420] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 09/16/2018] [Accepted: 12/09/2018] [Indexed: 12/17/2022]
Abstract
Hepatic stellate cells (HSCs) play an important role in hepatic fibrogenesis and inflammatory modulation. Endotoxin is dramatically increased in portal venous blood after serious injury and can contribute to liver damage. However, the mechanism underlying endotoxin's effects on HSCs remains largely unknown. Oridonin is a bioactive diterpenoid isolated from Rabdosia rubescens that exhibits anti-inflammatory properties in different tissues. In the present study, we determined the effects of oridonin on endotoxin-induced inflammatory response and signaling pathways in vitro. The production of proinflammatory cytokines in activated human HSCs line LX-2 was measured by ELISA and Western blots. Immunofluorescence and nuclear fractionation assay were used to determine NF-κB activity. Oridonin treatment significantly inhibited LPS-induced proinflammatory cytokines IL-1β, IL-6, and MCP-1 production as well as cell adhesion molecules ICAM-1 and VCAM-1. Additionally, oridonin blocked LPS-induced NF-κB p65 nuclear translocation and DNA binding activity. Oridonin prevented LPS-stimulated NF-κB regulator IKKα/β and IκBα phosphorylation and IκBα degradation. Combined treatment of oridonin and an Hsp70 substrate binding inhibitor synergistically suppressed LPS-stimulated proinflammatory cytokines and NF-κB pathway activation. Therefore, oridonin inhibits LPS-stimulated proinflammatory mediators through IKK/IκBα/NF-κB pathway. Oridonin could be a promising agent for a hepatic anti-inflammatory.
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13
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Caponegro MD, Torres LF, Rastegar C, Rath N, Anderson ME, Robinson JK, Tsirka SE. Pifithrin-μ modulates microglial activation and promotes histological recovery following spinal cord injury. CNS Neurosci Ther 2018; 25:200-214. [PMID: 29962076 DOI: 10.1111/cns.13000] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 05/31/2018] [Accepted: 06/04/2018] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Treatments immediately after spinal cord injury (SCI) are anticipated to decrease neuronal death, disruption of neuronal connections, demyelination, and inflammation, and to improve repair and functional recovery. Currently, little can be done to modify the acute phase, which extends to the first 48 hours post-injury. Efforts to intervene have focused on the subsequent phases - secondary (days to weeks) and chronic (months to years) - to both promote healing, prevent further damage, and support patients suffering from SCI. METHODS We used a contusion model of SCI in female mice, and delivered a small molecule reagent during the early phase of injury. Histological and behavioral outcomes were assessed and compared. RESULTS We find that the reagent Pifithrin-μ (PFT-μ) acts early and directly on microglia in vitro, attenuating their activation. When administered during the acute phase of SCI, PFT-μ resulted in reduced lesion size during the initial inflammatory phase, and reduced the numbers of pro-inflammatory microglia and macrophages. Treatment with PFT-μ during the early stage of injury maintained a stable anti-inflammatory environment. CONCLUSIONS Our results indicate that a small molecule reagent PFT-μ has sustained immunomodulatory effects following a single dose after injury.
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Affiliation(s)
- Michael D Caponegro
- Program in Molecular and Cellular Pharmacology, Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, USA
| | - Luisa F Torres
- Program in Molecular and Cellular Pharmacology, Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, USA
| | - Cyrus Rastegar
- Program in Molecular and Cellular Pharmacology, Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, USA.,Biological Psychology, Department of Psychology, Stony Brook University, Stony Brook, NY, USA
| | - Nisha Rath
- Program in Molecular and Cellular Pharmacology, Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, USA.,Biological Psychology, Department of Psychology, Stony Brook University, Stony Brook, NY, USA
| | - Maria E Anderson
- Biological Psychology, Department of Psychology, Stony Brook University, Stony Brook, NY, USA
| | - John K Robinson
- Biological Psychology, Department of Psychology, Stony Brook University, Stony Brook, NY, USA
| | - Stella E Tsirka
- Program in Molecular and Cellular Pharmacology, Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, USA
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14
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Li M, Song K, Huang X, Fu S, Zeng Q. GDF‑15 prevents LPS and D‑galactosamine‑induced inflammation and acute liver injury in mice. Int J Mol Med 2018; 42:1756-1764. [PMID: 29956733 DOI: 10.3892/ijmm.2018.3747] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 06/22/2018] [Indexed: 11/06/2022] Open
Abstract
Growth differentiation factor‑15 (GDF‑15) is a transforming growth factor (TGF)‑β superfamily member with a poorly characterized biological activity, speculated to be implicated in several diseases. The present study aimed to determine whether GDF‑15 participates in sepsis‑induced acute liver injury in mice. Lipopolysaccharide (LPS) and D‑galactosamine (D‑GalN) were administered to mice to induce acute liver injury. Survival of mice, histological changes in liver tissue, and levels of inflammatory biomarkers in serum and liver tissue were evaluated following treatment with GDF‑15. The underlying mechanism was investigated by western blotting, ELISA, flow cytometry, and reverse transcription‑quantitative polymerase chain reaction using Kupffer cells. The results demonstrated that GDF‑15 prevented LPS/D‑GalN‑induced death, increase in inflammatory cell infiltration and serum alanine aminotransferase and aspartate aminotransferase activities. In addition, GDF‑15 treatment reduced the production of hepatic malondialdehyde and myeloperoxidase, and attenuated the increase of interleukin (IL)‑6, tumor necrosis factor (TNF)‑α, and IL‑1β expression in serum and liver tissue, accompanied by inducible nitric oxide synthase (iNOS) inactivation in the liver. Similar changes in the expression of inflammatory cytokines, IL‑6, TNF‑α and IL‑1β, and iNOS activation were observed in the Kupffer cells. Further mechanistic experiments revealed that GDF‑15 effectively protected against LPS‑induced nuclear factor (NF)‑κB pathway activation by regulating TGFβ‑activated kinase 1 (TAK1) phosphorylation in Kupffer cells. In conclusion, GDF‑15 reduced the activation of pro‑inflammatory factors, and prevented LPS‑induced liver injury, most likely by disrupting TAK1 phosphorylation, and consequently inhibiting the activation of the NF‑κB pathway in the liver.
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Affiliation(s)
- Min Li
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Kui Song
- Department of Hematology, The First Affiliated Hospital of Jishou University, Jishou, Hunan 416000, P.R. China
| | - Xiaowen Huang
- Department of Pediatrics, Boai Hospital of Zhongshan City, Zhongshan, Guangdong 528400, P.R. China
| | - Simao Fu
- Department of Pediatrics, Boai Hospital of Zhongshan City, Zhongshan, Guangdong 528400, P.R. China
| | - Qiyi Zeng
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
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15
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Inhibition of stress-inducible HSP70 impairs mitochondrial proteostasis and function. Oncotarget 2018; 8:45656-45669. [PMID: 28484090 PMCID: PMC5542216 DOI: 10.18632/oncotarget.17321] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 04/03/2017] [Indexed: 12/20/2022] Open
Abstract
Protein quality control is an important component of survival for all cells. The use of proteasome inhibitors for cancer therapy derives from the fact that tumor cells generally exhibit greater levels of proteotoxic stress than do normal cells, and thus cancer cells tend to be more sensitive to proteasome inhibition. However, this approach has been limited in some cases by toxicity to normal cells. Recently, the concept of inhibiting proteostasis in organelles for cancer therapy has been advanced, in part because it is predicted to have reduced toxicity for normal cells. Here we demonstrate that a fraction of the major stress-induced chaperone HSP70 (also called HSPA1A or HSP72, but hereafter HSP70) is abundantly present in mitochondria of tumor cells, but is expressed at quite low or undetectable levels in mitochondria of most normal tissues and non-tumor cell lines. We show that treatment of tumor cells with HSP70 inhibitors causes a marked change in mitochondrial protein quality control, loss of mitochondrial membrane potential, reduced oxygen consumption rate, and loss of ATP production. We identify several nuclear-encoded mitochondrial proteins, including polyadenylate binding protein-1 (PABPC1), which exhibit decreased abundance in mitochondria following treatment with HSP70 inhibitors. We also show that targeting HSP70 function leads to reduced levels of several mitochondrial-encoded RNA species that encode components of the electron transport chain. Our data indicate that small molecule inhibitors of HSP70 represent a new class of organelle proteostasis inhibitors that impair mitochondrial function in cancer cells, and therefore constitute novel therapeutics.
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16
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Protein mediated regulation of the NHE1 isoform of the Na + /H + exchanger in renal cells. A regulatory role of Hsp90 and AKT kinase. Cell Signal 2017; 36:145-153. [DOI: 10.1016/j.cellsig.2017.05.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/28/2017] [Accepted: 05/05/2017] [Indexed: 11/19/2022]
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17
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Affiliation(s)
| | - Larry Fliegel
- a Department of Biochemistry , University of Alberta , Edmonton , AB , Canada
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18
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Kattaia AAA, Abd El-Baset SA, Mohamed EM, Abdul-Maksou RS, Elfakharany YM. Molecular mechanisms underlying histological and biochemical changes induced by nitrate in rat liver and the efficacy of S-Allylcysteine. Ultrastruct Pathol 2016; 41:10-22. [DOI: 10.1080/01913123.2016.1252821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Asmaa A. A. Kattaia
- Department of Histology and Cell Biology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Samia A. Abd El-Baset
- Department of Histology and Cell Biology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Eman M. Mohamed
- Department of Histology and Cell Biology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | | | - Yara M. Elfakharany
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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19
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Amith SR, Vincent KM, Wilkinson JM, Postovit LM, Fliegel L. Defining the Na +/H + exchanger NHE1 interactome in triple-negative breast cancer cells. Cell Signal 2016; 29:69-77. [PMID: 27751915 DOI: 10.1016/j.cellsig.2016.10.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/04/2016] [Accepted: 10/13/2016] [Indexed: 12/30/2022]
Abstract
Mounting evidence supports a major role for the Na+/H+ exchanger NHE1 in cancer progression and metastasis. NHE1 is hyperactive at the onset of oncogenic transformation, resulting in intracellular alkalinization and extracellular microenvironmental acidification. These conditions promote invasion and facilitate metastasis. However, the signal pathways governing the regulation of exchanger activity are still unclear. This is especially important in the aggressively metastatic, triple-negative basal breast cancer subtype. We used affinity chromatography followed by mass spectrometry to identify novel and putative interaction partners of NHE1 in MDA-MB-231 triple-negative breast cancer cells. NHE1 associated with several types of proteins including cytoskeletal proteins and chaperones. We validated protein interactions by co-immunoprecipitation for: 14-3-3, AKT, α-enolase, CHP1, HSP70 and HSP90. Additionally, we used The Cancer Genome Atlas (TCGA) to study NHE1 gene expression in primary patient breast tumours versus adjacent normal tissue. NHE1 expression was elevated in breast tumour samples and, when broken down by breast cancer subtype, NHE1 gene expression was significantly lower in tumours of the basal subtype compared to luminal and HER2+ subtypes. Reverse phase protein array (RPPA) analysis showed that NHE1 expression positively correlated with p90RSK expression in basal, but not luminal, primary tumours. Other proteins were negatively correlated with NHE1 expression in basal breast cancer tumours. Taken together, our data provides the first insight into the signalling molecules that form the NHE1 interactome in triple-negative breast cancer cells. These results will focus our search for novel targeted therapies.
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Affiliation(s)
- Schammim Ray Amith
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
| | - Krista Marie Vincent
- Department of Oncology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada; Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario N6A 3K7, Canada.
| | - Jodi Marie Wilkinson
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
| | - Lynne Marie Postovit
- Department of Oncology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
| | - Larry Fliegel
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
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20
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Wu Y, Zhang M, Liu R, Zhao C. Oxidative Stress-Activated NHE1 Is Involved in High Glucose-Induced Apoptosis in Renal Tubular Epithelial Cells. Yonsei Med J 2016; 57:1252-9. [PMID: 27401659 PMCID: PMC4960394 DOI: 10.3349/ymj.2016.57.5.1252] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 01/14/2016] [Accepted: 02/17/2016] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Diabetic nephropathy (DN) is a prevalent chronic microvascular complication of diabetes mellitus involving disturbances in electrolytes and the acid-base balance caused by a disorder of glucose metabolism. NHE1 is a Na⁺/H⁺ exchanger responsible for keeping intracellular pH (pHi) balance and cell growth. Our study aimed to investigate roles of NHE1 in high glucose (HG)-induced apoptosis in renal tubular epithelial cells. MATERIALS AND METHODS Renal epithelial tubular cell line HK-2 was cultured in medium containing 5 mM or 30 mM glucose. Then, cell apoptosis, oxidative stress, NHE1 expression, and pHi were evaluated. NHE1 siRNA and inhibitor were used to evaluate its role in cell apoptosis. RESULTS HG significantly increased cell apoptosis and the production of reactive oxygen species (ROS) and 8-OHdG (p<0.05). Meanwhile, we found that HG induced the expression of NHE1 and increased the pHi from 7.0 to 7.6 after 48 h of incubation. However, inhibiting NHE1 using its specific siRNA or antagonist DMA markedly reduced cell apoptosis stimulated by HG. In addition, suppressing cellular oxidative stress using antioxidants, such as glutathione and N-acetyl cysteine, significantly reduced the production of ROS, accompanied by a decrease in NHE1. We also found that activated cyclic GMP-Dependent Protein Kinase Type I (PKG) signaling promoted the production of ROS, which contributed to the regulation of NHE1 functions. CONCLUSION Our study indicated that HG activates PKG signaling and elevates the production of ROS, which was responsible for the induction of NHE1 expression and dysfunction, as well as subsequent cell apoptosis, in renal tubular epithelial cells.
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Affiliation(s)
- Yiqing Wu
- Department of Nephrology, Tianjin Union Medicine Center, Tianjin, China
| | - Min Zhang
- Department of Nephrology, Tianjin Union Medicine Center, Tianjin, China
| | - Rui Liu
- Department of Rehabilitation, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Chunjie Zhao
- Department of Cardiology, Tianjin Union Medicine Center, Tianjin, China.
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21
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Kumar S, Stokes J, Singh UP, Scissum Gunn K, Acharya A, Manne U, Mishra M. Targeting Hsp70: A possible therapy for cancer. Cancer Lett 2016; 374:156-166. [PMID: 26898980 PMCID: PMC5553548 DOI: 10.1016/j.canlet.2016.01.056] [Citation(s) in RCA: 154] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 01/28/2016] [Accepted: 01/31/2016] [Indexed: 01/13/2023]
Abstract
In all organisms, heat-shock proteins (HSPs) provide an ancient defense system. These proteins act as molecular chaperones by assisting proper folding and refolding of misfolded proteins and aid in the elimination of old and damaged cells. HSPs include Hsp100, Hsp90, Hsp70, Hsp40, and small HSPs. Through its substrate-binding domains, Hsp70 interacts with wide spectrum of molecules, ranging from unfolded to natively folded and aggregated proteins, and provides cytoprotective role against various cellular stresses. Under pathophysiological conditions, the high expression of Hsp70 allows cells to survive with lethal injuries. Increased Hsp70, by interacting at several points on apoptotic signaling pathways, leads to inhibition of apoptosis. Elevated expression of Hsp70 in cancer cells may be responsible for tumorigenesis and for tumor progression by providing resistance to chemotherapy. In contrast, inhibition or knockdown of Hsp70 reduces the size of tumors and can cause their complete regression. Moreover, extracellular Hsp70 acts as an immunogen that participates in cross presentation of MHC-I molecules. The goals of this review are to examine the roles of Hsp70 in cancer and to present strategies targeting Hsp70 in the development of cancer therapeutics.
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Affiliation(s)
- Sanjay Kumar
- Cancer Biology Research and Training Program, Department of Biological Sciences, Alabama State University, AL 36101, USA
| | - James Stokes
- Cancer Biology Research and Training Program, Department of Biological Sciences, Alabama State University, AL 36101, USA
| | - Udai P Singh
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC 29208, USA
| | - Karyn Scissum Gunn
- Cancer Biology Research and Training Program, Department of Biological Sciences, Alabama State University, AL 36101, USA
| | - Arbind Acharya
- Centre of Advance Study in Zoology, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India
| | - Upender Manne
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Manoj Mishra
- Cancer Biology Research and Training Program, Department of Biological Sciences, Alabama State University, AL 36101, USA.
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22
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Emery SM, Dobrowsky RT. Promoting Neuronal Tolerance of Diabetic Stress: Modulating Molecular Chaperones. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2016; 127:181-210. [PMID: 27133150 DOI: 10.1016/bs.irn.2016.03.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The etiology of diabetic peripheral neuropathy (DPN) involves an interrelated series of metabolic and vascular insults that ultimately contribute to sensory neuron degeneration. In the quest to pharmacologically manage DPN, small-molecule inhibitors have targeted proteins and pathways regarded as "diabetes specific" as well as others whose activity are altered in numerous disease states. These efforts have not yielded any significant therapies, due in part to the complicating issue that the biochemical contribution of these targets/pathways to the progression of DPN does not occur with temporal and/or biochemical uniformity between individuals. In a complex, chronic neurodegenerative disease such as DPN, it is increasingly appreciated that effective disease management may not necessarily require targeting a pathway or protein considered to contribute to disease progression. Alternatively, it may prove sufficiently beneficial to pharmacologically enhance the activity of endogenous cytoprotective pathways to aid neuronal tolerance to and recovery from glucotoxic stress. In pursuing this paradigm shift, we have shown that modulating the activity and expression of molecular chaperones such as heat shock protein 70 (Hsp70) may provide translational potential for the effective medical management of insensate DPN. Considerable evidence supports that modulating Hsp70 has beneficial effects in improving inflammation, oxidative stress, and glucose sensitivity. Given the emerging potential of modulating Hsp70 to manage DPN, the current review discusses efforts to characterize the cytoprotective effects of this protein and the benefits and limitations that may arise in drug development efforts that exploit its cytoprotective activity.
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Affiliation(s)
- S M Emery
- The University of Kansas, Lawrence, KS, United States
| | - R T Dobrowsky
- The University of Kansas, Lawrence, KS, United States.
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23
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Pretreatment with lipopolysaccharide attenuates diethylnitrosamine-caused liver injury in mice via TLR4-dependent induction of Kupffer cell M2 polarization. Immunol Res 2016; 62:137-45. [PMID: 25846584 DOI: 10.1007/s12026-015-8644-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this study, we found that pretreatment with low dose of lipopolysaccharide (LPS), also known as lipoglycans and endotoxin, obviously attenuated liver injury caused by diethylnitrosamine (DEN) in mice. This protective effect was described by decreased ALT, TNF-α, and IL-1β and increased TGF-β production. However, Toll-like receptor 4-deficient (TLR4(-/-)) or macrophages depletion abolished this protection in mice, which revealed Kupffer cells (KCs) and TLR4 to be crucial for the prevention of LPS against DEN-induced damage. Further study revealed that LPS pretreatment induced the KCs to M2 polarization and impaired the signaling of MAPKs and NF-κB that mediated the production of inflammatory cytokines. Moreover, T regulatory cells (Tregs) were also recruited to the liver, which may mediate immunosuppression and participate in the prevention of DEN-induced injury. Our results suggested that LPS protected against DEN-induced hepatitis via induction of M2 Kupffer cells and recruitment of Tregs, which contributes to liver tolerance in TLR4-dependent mechanism.
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24
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Ma J, Pan P, Anyika M, Blagg BSJ, Dobrowsky RT. Modulating Molecular Chaperones Improves Mitochondrial Bioenergetics and Decreases the Inflammatory Transcriptome in Diabetic Sensory Neurons. ACS Chem Neurosci 2015; 6:1637-48. [PMID: 26161583 DOI: 10.1021/acschemneuro.5b00165] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
We have previously demonstrated that modulating molecular chaperones with KU-32, a novobiocin derivative, ameliorates physiologic and bioenergetic deficits of diabetic peripheral neuropathy (DPN). Replacing the coumarin core of KU-32 with a meta-fluorinated biphenyl ring system created KU-596, a novobiocin analogue (novologue) that showed neuroprotective activity in a cell-based assay. The current study sought to determine whether KU-596 offers similar therapeutic potential for treating DPN. Administration of 2-20 mg/kg of KU-596 improved diabetes induced hypoalgesia and sensory neuron bioenergetic deficits in a dose-dependent manner. However, the drug could not improve these neuropathic deficits in diabetic heat shock protein 70 knockout (Hsp70 KO) mice. To gain further insight into the mechanisms by which KU-596 improved DPN, we performed transcriptomic analysis of sensory neuron RNA obtained from diabetic wild-type and Hsp70 KO mice using RNA sequencing. Bioinformatic analysis of the differentially expressed genes indicated that diabetes strongly increased inflammatory pathways and that KU-596 therapy effectively reversed these increases independent of Hsp70. In contrast, the effects of KU-596 on decreasing the expression of genes regulating the production of reactive oxygen species were more Hsp70-dependent. These data indicate that modulation of molecular chaperones by novologue therapy offers an effective approach toward correcting nerve dysfunction in DPN but that normalization of inflammatory pathways alone by novologue therapy seems to be insufficient to reverse sensory deficits associated with insensate DPN.
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Affiliation(s)
- Jiacheng Ma
- Department of Pharmacology and Toxicology and ‡̂Department
of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Pan Pan
- Department of Pharmacology and Toxicology and ‡̂Department
of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Mercy Anyika
- Department of Pharmacology and Toxicology and ‡̂Department
of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Brian S. J. Blagg
- Department of Pharmacology and Toxicology and ‡̂Department
of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
| | - Rick T. Dobrowsky
- Department of Pharmacology and Toxicology and ‡̂Department
of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
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25
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Liao RJ, Tong LJ, Huang C, Cao WW, Wang YZ, Wang J, Chen XF, Zhu WZ, Zhang W. Rescue of cardiac failing and remodelling by inhibition of protein phosphatase 1γ is associated with suppression of the alternative splicing factor-mediated splicing of Ca2+/calmodulin-dependent protein kinase δ. Clin Exp Pharmacol Physiol 2015; 41:976-85. [PMID: 25224648 DOI: 10.1111/1440-1681.12308] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 08/24/2014] [Accepted: 08/31/2014] [Indexed: 11/25/2022]
Abstract
Our previous studies showed that protein phosphatase 1γ (PP1γ) exacerbates cardiomyocyte apoptosis through promotion of Ca(2+)/calmodulin-dependent protein kinase δ (CaMKIIδ) splicing. Here we determine the role of PP1γ in abdominal aorta constriction-induced hypertrophy and remodelling in rat hearts. Systolic blood pressure and echocardiographic measurements were used to evaluate the model of cardiac hypertrophy. Sirius red staining and invasive haemodynamic/cardiac index measurements were used to evaluate the effects of PP1γ or inhibitor 1 of PP1 transfection. Western blot, reverse transcription polymerase chain reaction and co-immunoprecipitation were applied to investigate the molecular mechanisms. Transfection of PP1γ increased the value of the heart mass index, left ventricular mass index and cardiac fibrosis, and simultaneously decreased the value of maximal left ventricular pressure increase and decline rate, ejection fraction, fractional shortening, and left ventricular end-diastolic pressure, as well as left ventricular systolic pressure. Transfection of inhibitor 1 of PP1, however, showed opposite effects on the aforementioned indexes. Overexpression of PP1γ potentiated CaMKIIδC production and decreased CaMKIIδB production in the hypertrophic heart. In contrast, inhibition of PP1γ re-balanced the CaMKIIδ splicing. Furthermore, CaMKII activity was found to be augmented or attenuated by PP1γ overexpression or inhibition, respectively. Further mechanistic studies showed that abdominal aorta constriction stress specifically increased the association of alternative splicing factor with PP1γ, but not with PP1β. Overexpression of PP1γ, but not inhibitor 1 of PP1, further potentiated this association. These results suggest that PP1γ alters the cardiac hypertrophy and remodelling likely through promotion of the alternative splicing factor-mediated splicing of CaMKIIδ.
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Affiliation(s)
- Ru-Jia Liao
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, China
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26
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Liu Z, Guo J, Sun H, Huang Y, Zhao R, Yang X. α-Lipoic acid attenuates LPS-induced liver injury by improving mitochondrial function in association with GR mitochondrial DNA occupancy. Biochimie 2015; 116:52-60. [PMID: 26133658 DOI: 10.1016/j.biochi.2015.06.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Accepted: 06/22/2015] [Indexed: 12/21/2022]
Abstract
α-Lipoic acid (LA) has been demonstrated to be a key regulator of energy metabolism. However, whether LA can protect the liver from inflammation, as well as the underlying mechanism involved, are still largely unclear. In the present study, mice treated with lipopolysaccharide (LPS) and injected with LA were used as a model. Liver injury, energy metabolism and mitochondrial regulation were investigated to assess the protective effect of LA on the liver and explore the possible mechanisms involved. Our results showed that LA attenuated liver injury, as evidenced by the decreased plasma alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels after LA treatment compared with the LPS-treated group. The hepatic ATP and NADH levels, expression levels of most mitochondrial DNA (mtDNA)-encoded genes as well as mitochondrial complex I, IV and V activities were all significantly increased in the LA-treated group compared with the LPS-treated group. Levels of Sirt3 protein, which is essential for the regulation of mitochondrial metabolism, were also increased in the LA-treated group. Regarding the regulation of mtDNA-encoded genes expression, we observed no obvious change in the methylation status of the mtDNA D-loop region. However, compared to the LPS-treated group, LA treatment increased glucocorticoid receptor (GR) protein expression in the liver, as well as the level of GR occupancy on the mtDNA D-loop region. Our study demonstrates that LA exerts a liver-protective effect in an inflammation state by improving mitochondrial function. Furthermore, to the best of our knowledge, we demonstrate for the first time that GR may be involved in this effect via an enhanced binding to the mtDNA transcriptional control region, thereby regulating the expression of mtDNA-encoded genes.
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Affiliation(s)
- Zhiqing Liu
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Jun Guo
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Hailin Sun
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Yanping Huang
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Ruqian Zhao
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Xiaojing Yang
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, PR China.
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Huang C, Tong L, Lu X, Wang J, Yao W, Jiang B, Zhang W. Methylene Blue Attenuates iNOS Induction Through Suppression of Transcriptional Factor Binding Amid iNOS mRNA Transcription. J Cell Biochem 2015; 116:1730-40. [DOI: 10.1002/jcb.25132] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 02/06/2015] [Indexed: 12/26/2022]
Affiliation(s)
- Chao Huang
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Lijuan Tong
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Xu Lu
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Jia Wang
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Wenjuan Yao
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Bo Jiang
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
| | - Wei Zhang
- Department of Pharmacology; School of Pharmacy; Nantong University; #19 Qixiu Road Nantong Jiangsu Province 226001 China
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28
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Pasqua T, Filice E, Mazza R, Quintieri AM, Carmela Cerra M, Iannacone R, Melfi D, Indiveri C, Gattuso A, Angelone T. Cardiac and hepatic role of r-AtHSP70: basal effects and protection against ischemic and sepsis conditions. J Cell Mol Med 2015; 19:1492-503. [PMID: 25904190 PMCID: PMC4511348 DOI: 10.1111/jcmm.12491] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 10/15/2014] [Indexed: 12/14/2022] Open
Abstract
Heat shock proteins (HSPs), highly conserved in all organisms, act as molecular chaperones activated by several stresses. The HSP70 class of stress-induced proteins is the most studied subtype in cardiovascular and inflammatory disease. Because of the high similarity between plant and mammalian HSP70, the aim of this work was to evaluate whether recombinant HSP70 of plant origin (r-AtHSP70) was able to protect rat cardiac and hepatic function under ischemic and sepsis conditions. We demonstrated for the first time that, in ex vivo isolated and perfused rat heart, exogenous r-AtHSP70 exerted direct negative inotropic and lusitropic effects via Akt/endothelial nitric oxide synthase pathway, induced post-conditioning cardioprotection via Reperfusion Injury Salvage Kinase and Survivor Activating Factor Enhancement pathways, and did not cause hepatic damage. In vivo administration of r-AtHSP70 protected both heart and liver against lipopolysaccharide-dependent sepsis, as revealed by the reduced plasma levels of interleukin-1β, tumour necrosis factor alpha, aspartate aminotransferase and alanine aminotransferase. These results suggest exogenous r-AtHSP70 as a molecular modulator able to protect myocardial function and to prevent cardiac and liver dysfunctions during inflammatory conditions.
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Affiliation(s)
- Teresa Pasqua
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Elisabetta Filice
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Rosa Mazza
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Anna Maria Quintieri
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Maria Carmela Cerra
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy.,National Institute of Cardiovascular Research, Bologna, Italy
| | - Rina Iannacone
- ALSIA-Research Center Metapontum Agrobios, Metaponto (MT), Italy
| | - Donato Melfi
- ALSIA-Research Center Metapontum Agrobios, Metaponto (MT), Italy
| | - Cesare Indiveri
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Alfonsina Gattuso
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy
| | - Tommaso Angelone
- Department of Biology, Ecology and Earth Sciences, University of Calabria, Arcavacata di Rende (CS), Italy.,National Institute of Cardiovascular Research, Bologna, Italy
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Huang C, Lu X, Wang J, Tong L, Jiang B, Zhang W. Inhibition of endogenous heat shock protein 70 attenuates inducible nitric oxide synthase induction via disruption of heat shock protein 70/Na(+) /H(+) exchanger 1-Ca(2+) -calcium-calmodulin-dependent protein kinase II/transforming growth factor β-activated kinase 1-nuclear factor-κB signals in BV-2 microglia. J Neurosci Res 2015; 93:1192-202. [PMID: 25691123 DOI: 10.1002/jnr.23571] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 12/24/2014] [Accepted: 01/08/2015] [Indexed: 12/16/2022]
Abstract
Inducible nitric oxide synthase (iNOS) critically contributes to inflammation and host defense. The inhibition of heat shock protein 70 (Hsp70) prevents iNOS induction in lipopolysaccharide (LPS)-stimulated macrophages. However, the role and mechanism of endogenous Hsp70 in iNOS induction in microglia remains unclear. This study addresses this issue in BV-2 microglia, showing that Hsp70 inhibition or knockdown prevents LPS-induced iNOS protein expression and nitric oxide production. Real-time PCR experiments showed that LPS-induced iNOS mRNA transcription was blocked by Hsp70 inhibition. Further studies revealed that the inhibition of Hsp70 attenuated LPS-stimulated nuclear translocation and phosphorylation of nuclear factor (NF)-κB as well as the degradation of inhibitor of κB (IκB)-α and phosphorylation of IκB kinase β (IKKβ). This prevention effect of Hsp70 inhibition on IKKβ-NF-κB activation was found to be dependent on the Ca(2+) /calcium-calmodulin-dependent protein kinase II (CaMKII)/transforming growth factor β-activated kinase 1 (TAK1) signals based on the following observations: 1) chelation of intracellular Ca(2+) or inhibition of CaMKII reduced LPS-induced increases in TAK1 phosphorylation and 2) Hsp70 inhibition reduced LPS-induced increases in CaMKII/TAK1 phosphorylation, intracellular pH value, [Ca(2+) ]i , and CaMKII/TAK1 association. Mechanistic studies showed that Hsp70 inhibition disrupted the association between Hsp70 and Na(+) /H(+) exchanger 1 (NHE1), which is an important exchanger responsible for Ca(2+) influx in LPS-stimulated cells. These studies demonstrate that the inhibition of endogenous Hsp70 attenuates the induction of iNOS, which likely occurs through the disruption of NHE1/Hsp70-Ca(2+) -CaMKII/TAK1-NF-κB signals in BV-2 microglia, providing further insight into the functions of Hsp70 in the CNS.
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Affiliation(s)
- Chao Huang
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
| | - Xu Lu
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
| | - Jia Wang
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
| | - Lijuan Tong
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
| | - Bo Jiang
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
| | - Wei Zhang
- Department of Pharmacology, School of Medicine, Nantong University, Nantong, Jiangsu, People's Republic of China
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30
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Heat shock protein 70 in Alzheimer's disease. BIOMED RESEARCH INTERNATIONAL 2014; 2014:435203. [PMID: 25431764 PMCID: PMC4241292 DOI: 10.1155/2014/435203] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 08/16/2014] [Accepted: 09/07/2014] [Indexed: 12/31/2022]
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disease that caused dementia which has no effective treatment. Growing evidence has demonstrated that AD is a “protein misfolding disorder” that exhibits common features of misfolded, aggregation-prone proteins and selective cell loss in the mature nervous system. Heat shock protein 70 (HSP70) attracts extensive attention worldwide, because it plays a crucial role in preventing protein misfolding and inhibiting aggregation and represents a class of proteins potentially involved in AD pathogenesis. Numerous studies have indicated that HSP70 could suppress the progression of AD with in vitro and in vivo experiments. Thus, targeting HSP70 and the related compounds might represent a promising strategy for the treatment of AD.
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31
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Huang C, Wang Y, Wang J, Yao W, Chen X, Zhang W. TSG (2,3,4' ,5-tetrahydroxystilbene 2-O-β-D-glucoside) suppresses induction of pro-inflammatory factors by attenuating the binding activity of nuclear factor-κB in microglia. J Neuroinflammation 2013; 10:129. [PMID: 24144353 PMCID: PMC3854509 DOI: 10.1186/1742-2094-10-129] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 09/30/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Induction of pro-inflammatory factors is one of the characteristics of microglia activation and can be regulated by numerous active components of Chinese traditional herbs. Suppression of pro-inflammatory factors is beneficial to alleviate microglia-mediated cell injury. The present study aims to investigate the effect and possible mechanism of 2,3,4',5-tetrahydroxystilbene 2-O-β-D-glucoside (TSG) on LPS-mediated induction of pro-inflammatory factors in microglia. METHODS Western blot, ELISA, and Hoechst 33258 were used to measure the protein expression, TNF-α/IL-6 content, and apoptotic nuclei, respectively. The mRNA level was measured by real time-PCR. Nitric oxide (NO) content, lactate dehydrogenase (LDH) content, and NF-κB binding activity were assayed by commercial kits. RESULTS TSG reduced iNOS protein expression as well as TNF-α, IL-6, and NO content in LPS-stimulated BV-2 cells. TSG attenuated the increase in apoptotic nuclei, caspase-3 cleavage, and LDH content induced by BV-2 cell-derived conditioned medium in primary hippocampal neurons. Mechanistic studies showed that TSG reduced the mRNA level of iNOS, TNF-α, and IL-6. TSG failed to suppress IκB-α degradation, NF-κB phosphorylation and nuclear translocation, and ERK1/2, JNK, and p38 phosphorylation. TSG, however, markedly reduced the binding of NF-κB to its DNA element. Chromatin immunoprecipitation (ChIP) assays confirmed that TSG reduced NF-κB binding to the iNOS promoter. These findings were ascertained in primary microglia where the LPS-induced increase in iNOS expression, NO content, apoptotic nuclei, and NF-κB binding to its DNA element were diminished by TSG. CONCLUSIONS These studies demonstrate that TSG attenuates LPS-mediated induction of pro-inflammatory factors in microglia through reducing the binding activity of NF-κB. This might help us to further understand the pharmacological role of TSG in inflammatory response in the central nervous system.
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Affiliation(s)
| | | | | | | | | | - Wei Zhang
- Department of Pharmacology, School of Medicine, Nantong University, 19 Qixiu Road, Nantong 226001, Jiangsu, China.
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