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Dobish KK, Wittorf KJ, Swenson SA, Bean DC, Gavile CM, Woods NT, Ghosal G, Hyde RK, Buckley SM. FBXO21 mediated degradation of p85α regulates proliferation and survival of acute myeloid leukemia. Leukemia 2023; 37:2197-2208. [PMID: 37689825 PMCID: PMC10624613 DOI: 10.1038/s41375-023-02020-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 08/18/2023] [Accepted: 08/31/2023] [Indexed: 09/11/2023]
Abstract
Acute myeloid leukemia (AML) is a heterogeneous disease characterized by clonal expansion of myeloid blasts in the bone marrow (BM). Despite advances in therapy, the prognosis for AML patients remains poor, and there is a need to identify novel molecular pathways regulating tumor cell survival and proliferation. F-box ubiquitin E3 ligase, FBXO21, has low expression in AML, but expression correlates with survival in AML patients and patients with higher expression have poorer outcomes. Silencing FBXO21 in human-derived AML cell lines and primary patient samples leads to differentiation, inhibition of tumor progression, and sensitization to chemotherapy agents. Additionally, knockdown of FBXO21 leads to up-regulation of cytokine signaling pathways. Through a mass spectrometry-based proteomic analysis of FBXO21 in AML, we identified that FBXO21 ubiquitylates p85α, a regulatory subunit of the phosphoinositide 3-kinase (PI3K) pathway, for degradation resulting in decreased PI3K signaling, dimerization of free p85α and ERK activation. These findings reveal the ubiquitin E3 ligase, FBXO21, plays a critical role in regulating AML pathogenesis, specifically through alterations in PI3K via regulation of p85α protein stability.
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Affiliation(s)
- Kasidy K Dobish
- Department of Internal Medicine, Division of Hematology & Hematopoietic Malignancies, University of Utah, Salt Lake City, UT, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, USA
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Karli J Wittorf
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, USA
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Samantha A Swenson
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Dalton C Bean
- Department of Internal Medicine, Division of Hematology & Hematopoietic Malignancies, University of Utah, Salt Lake City, UT, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
- Department of Oncological Sciences, University of Utah, Salt Lake City, USA
| | - Catherine M Gavile
- Department of Internal Medicine, Division of Hematology & Hematopoietic Malignancies, University of Utah, Salt Lake City, UT, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
| | - Nicholas T Woods
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE, USA
| | - Gargi Ghosal
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, USA
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - R Katherine Hyde
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Shannon M Buckley
- Department of Internal Medicine, Division of Hematology & Hematopoietic Malignancies, University of Utah, Salt Lake City, UT, USA.
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.
- Department of Oncological Sciences, University of Utah, Salt Lake City, USA.
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Chemistry and the Potential Antiviral, Anticancer, and Anti-Inflammatory Activities of Cardiotonic Steroids Derived from Toads. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27196586. [PMID: 36235123 PMCID: PMC9571018 DOI: 10.3390/molecules27196586] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/30/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022]
Abstract
Cardiotonic steroids (CTS) were first documented by ancient Egyptians more than 3000 years ago. Cardiotonic steroids are a group of steroid hormones that circulate in the blood of amphibians and toads and can also be extracted from natural products such as plants, herbs, and marines. It is well known that cardiotonic steroids reveal effects against congestive heart failure and atrial fibrillation; therefore, the term "cardiotonic" has been coined. Cardiotonic steroids are divided into two distinct groups: cardenolides (plant-derived) and bufadienolides (mainly of animal origin). Cardenolides have an unsaturated five-membered lactone ring attached to the steroid nucleus at position 17; bufadienolides have a doubly unsaturated six-membered lactone ring. Cancer is a leading cause of mortality in humans all over the world. In 2040, the global cancer load is expected to be 28.4 million cases, which would be a 47% increase from 2020. Moreover, viruses and inflammations also have a very nebative impact on human health and lead to mortality. In the current review, we focus on the chemistry, antiviral and anti-cancer activities of cardiotonic steroids from the naturally derived (toads) venom to combat these chronic devastating health problems. The databases of different research engines (Google Scholar, PubMed, Science Direct, and Sci-Finder) were screened using different combinations of the following terms: “cardiotonic steroids”, “anti-inflammatory”, “antiviral”, “anticancer”, “toad venom”, “bufadienolides”, and “poison chemical composition”. Various cardiotonic steroids were isolated from diverse toad species and exhibited superior anti-inflammatory, anticancer, and antiviral activities in in vivo and in vitro models such as marinobufagenin, gammabufotalin, resibufogenin, and bufalin. These steroids are especially difficult to identify. However, several compounds and their bioactivities were identified by using different molecular and biotechnological techniques. Biotechnology is a new tool to fully or partially generate upscaled quantities of natural products, which are otherwise only available at trace amounts in organisms.
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Morenikeji OB, Bernard K, Strutton E, Wallace M, Thomas BN. Evolutionarily Conserved Long Non-coding RNA Regulates Gene Expression in Cytokine Storm During COVID-19. Front Bioeng Biotechnol 2021; 8:582953. [PMID: 33520952 PMCID: PMC7844208 DOI: 10.3389/fbioe.2020.582953] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/27/2020] [Indexed: 01/08/2023] Open
Abstract
Coronavirus is a family of viruses including alpha-, beta-, gamma-, delta-coronaviruses. Only alpha- and betacoronaviruses have been observed to infect humans. Past outbreaks of SARS-CoV and MERS-CoV, both betacoronavirus, are the result of a spillover from animals. Recently, a new strain termed SARS-CoV-2 emerged in December 2019 in Wuhan, China. Severe cases of COVID-19, the disease caused by SARS-CoV-2, lead to acute respiratory distress syndrome (ARDS). One contributor to the development of ARDS is cytokine storm, an overwhelming inflammatory immune response. Long non-coding RNAs (lncRNAs) are genetic regulatory elements that, among many functions, alter gene expression and cellular processes. lncRNAs identified to be pertinent in COVID-19 cytokine storm have the potential to serve as disease markers or drug targets. This project aims to computationally identify conserved lncRNAs potentially regulating gene expression in cytokine storm during COVID-19. We found 22 lncRNAs that can target 10 cytokines overexpressed in COVID-19 cytokine storm, 8 of which targeted two or more cytokine storm cytokines. In particular, the lncRNA non-coding RNA activated by DNA damage (NORAD), targeted five out of the ten identified cytokine storm cytokines, and is evolutionarily conserved across multiple species. These lncRNAs are ideal candidates for further in vitro and in vivo analysis.
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Affiliation(s)
| | - Kahleel Bernard
- Department of Biology, Hamilton College, Clinton, NY, United States
| | - Ellis Strutton
- Department of Biology, Hamilton College, Clinton, NY, United States
| | | | - Bolaji N Thomas
- Department of Biomedical Sciences, Rochester Institute of Technology, Rochester, NY, United States
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QTL Mapping of Intestinal Neutrophil Variation in Threespine Stickleback Reveals Possible Gene Targets Connecting Intestinal Inflammation and Systemic Health. G3-GENES GENOMES GENETICS 2020; 10:613-622. [PMID: 31843804 PMCID: PMC7003091 DOI: 10.1534/g3.119.400685] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Selection, via host immunity, is often required to foster beneficial microbial symbionts and suppress deleterious pathogens. In animals, the host immune system is at the center of this relationship. Failed host immune system-microbial interactions can result in a persistent inflammatory response in which the immune system indiscriminately attacks resident microbes, and at times the host cells themselves, leading to diseases such as Ulcerative Colitis, Crohn’s Disease, and Psoriasis. Host genetic variation has been linked to both microbiome diversity and to severity of such inflammatory disease states in humans. However, the microbiome and inflammatory states manifest as quantitative traits, which encompass many genes interacting with one another and the environment. The mechanistic relationships among all of these interacting components are still not clear. Developing natural genetic models of host-microbe interactions is therefore fundamental to understanding the complex genetics of these and other diseases. Threespine stickleback (Gasterosteus aculeatus) fish are a tractable model for attacking this problem because of abundant population-level genetic and phenotypic variation in the gut inflammatory response. Previous work in our laboratory identified genetically divergent stickleback populations exhibiting differences in intestinal neutrophil activity. We took advantage of this diversity to genetically map variation in an emblematic element of gut inflammation - intestinal neutrophil recruitment - using an F2-intercross mapping framework. We identified two regions of the genome associated with increased intestinal inflammation containing several promising candidate genes. Within these regions we found candidates in the Coagulation/Complement System, NFkB and MAPK pathways along with several genes associated with intestinal diseases and neurological diseases commonly accompanying intestinal inflammation as a secondary symptom. These findings highlight the utility of using naturally genetically diverse ‘evolutionary mutant models’ such as threespine stickleback to better understand interactions among host genetic diversity and microbiome variation in health and disease states.
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Lee MKS, Al-Sharea A, Shihata WA, Bertuzzo Veiga C, Cooney OD, Fleetwood AJ, Flynn MC, Claeson E, Palmer CS, Lancaster GI, Henstridge DC, Hamilton JA, Murphy AJ. Glycolysis Is Required for LPS-Induced Activation and Adhesion of Human CD14 +CD16 - Monocytes. Front Immunol 2019; 10:2054. [PMID: 31555280 PMCID: PMC6742687 DOI: 10.3389/fimmu.2019.02054] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 08/14/2019] [Indexed: 01/09/2023] Open
Abstract
Monocytes in humans consist of 3 subsets; CD14+CD16- (classical), CD14+CD16+ (intermediate) and CD14dimCD16+ (non-classical), which exhibit distinct and heterogeneous responses to activation. During acute inflammation CD14+CD16- monocytes are significantly elevated and migrate to the sites of injury via the adhesion cascade. The field of immunometabolism has begun to elucidate the importance of the engagement of specific metabolic pathways in immune cell function. Yet, little is known about monocyte metabolism and the role of metabolism in mediating monocyte activation and adherence to vessels. Accordingly, we aimed to determine whether manipulating the metabolism of CD14+CD16- monocytes alters their ability to become activated and adhere. We discovered that LPS stimulation increased the rate of glycolysis in human CD14+CD16- monocytes. Inhibition of glycolysis with 2-deoxy-D-glucose blunted LPS-induced activation and adhesion of monocytes. Mechanistically, we found that increased glycolysis was regulated by mTOR-induced glucose transporter (GLUT)-1. Furthermore, enhanced glycolysis increased accumulation of reactive oxygen species (ROS) and activation of p38 MAPK, which lead to activation and adhesion of monocytes. These findings reveal that glycolytic metabolism is critical for the activation of CD14+CD16- monocytes and contributes to our understanding of the interplay between metabolic substrate preference and immune cell function.
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Affiliation(s)
- Man K. S. Lee
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Diabetes, Monash University, Melbourne, VIC, Australia
| | - Annas Al-Sharea
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
- Department of Diabetes, Monash University, Melbourne, VIC, Australia
| | - Waled A. Shihata
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Camilla Bertuzzo Veiga
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Olivia D. Cooney
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Andrew J. Fleetwood
- Department of Medicine, The Royal Melbourne Hospital, Parkville, VIC, Australia
- Australian Institute of Musculoskeletal Science, University of Melbourne and Western Health, St. Albans, VIC, Australia
| | - Michelle C. Flynn
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Ellen Claeson
- Faculty of Medicine and Health Sciences, Linköping University, Linköping, Sweden
| | - Clovis S. Palmer
- Department of Infectious Disease, Burnet Institute, Melbourne, VIC, Australia
| | - Graeme I. Lancaster
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Darren C. Henstridge
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - John A. Hamilton
- Department of Medicine, The Royal Melbourne Hospital, Parkville, VIC, Australia
- Australian Institute of Musculoskeletal Science, University of Melbourne and Western Health, St. Albans, VIC, Australia
| | - Andrew J. Murphy
- Division of Immunometabolism, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
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Walsh KB, Zhang X, Zhu X, Wohleb E, Woo D, Lu L, Adeoye O. Intracerebral hemorrhage induces monocyte-related gene expression within six hours: Global transcriptional profiling in swine ICH. Metab Brain Dis 2019; 34:763-774. [PMID: 30796715 PMCID: PMC6910870 DOI: 10.1007/s11011-019-00399-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 02/13/2019] [Indexed: 12/12/2022]
Abstract
Intracerebral hemorrhage (ICH) is a severe neurological disorder with no proven treatment. Our prior research identified a significant association with monocyte level and ICH mortality. To advance our understanding, we sought to identify gene expression after ICH using a swine model to test the hypothesis that ICH would induce peripheral blood mononuclear cell (PBMC) gene expression. In 10 pigs with ICH, two PBMC samples were drawn from each with the first immediately prior to ICH induction and the second six hours later. RNA-seq was performed with subsequent bioinformatics analysis using Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and Ingenuity® Pathway Analysis (IPA). There were 182 significantly upregulated and 153 significantly down-regulated differentially expressed genes (DEGs) after ICH. Consistent with findings in humans, significant GO and KEGG pathways were primarily related to inflammation and the immune response. Five genes, all upregulated post-ICH and known to be associated with monocyte activation, were repeatedly DEGs in the significant KEGG pathways: CD14, TLR4, CXCL8, IL-18, and CXCL2. In IPA, the majority of upregulated disease/function categories were related to inflammation and immune cell activation. TNF and LPS were the most significantly activated upstream regulators, and ERK was the most highly connected node in the top network. ICH induced changes in PBMC gene expression within 6 h of onset related to inflammation, the immune response, and, more specifically, monocyte activation. Further research is needed to determine if these changes affect outcomes and may represent new therapeutic targets.
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Affiliation(s)
- Kyle B Walsh
- University of Cincinnati Gardner Neuroscience Institute, Cincinnati, OH, USA.
- Department of Emergency Medicine, University of Cincinnati, College of Medicine, 231 Albert Sabin Way, Cincinnati, OH, 45267-0769, USA.
| | - Xiang Zhang
- Department of Environmental Health, University of Cincinnati, Cincinnati, OH, USA
| | - Xiaoting Zhu
- Division of Biomedical Informatics, Cincinnati Children's Research Foundation, Cincinnati, OH, USA
- Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, USA
| | - Eric Wohleb
- Department of Pharmacology and Systems Physiology, University of Cincinnati, Cincinnati, OH, USA
- University of Cincinnati Neurobiology Research Center, Cincinnati, OH, USA
| | - Daniel Woo
- University of Cincinnati Gardner Neuroscience Institute, Cincinnati, OH, USA
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Long Lu
- Division of Biomedical Informatics, Cincinnati Children's Research Foundation, Cincinnati, OH, USA
- Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, USA
| | - Opeolu Adeoye
- University of Cincinnati Gardner Neuroscience Institute, Cincinnati, OH, USA
- Department of Emergency Medicine, University of Cincinnati, College of Medicine, 231 Albert Sabin Way, Cincinnati, OH, 45267-0769, USA
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Walsh KB, Zhang X, Zhu X, Wohleb E, Woo D, Lu L, Adeoye O. Intracerebral Hemorrhage Induces Inflammatory Gene Expression in Peripheral Blood: Global Transcriptional Profiling in Intracerebral Hemorrhage Patients. DNA Cell Biol 2019; 38:660-669. [PMID: 31120332 DOI: 10.1089/dna.2018.4550] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
To perform global transcriptome profiling using RNA-seq in the peripheral blood of intracerebral hemorrhage (ICH) patients. In 11 patients with ICH, peripheral blood was collected within 24 h of symptom onset or last known well, and a second blood draw occurred 72 h (±6) after the first. RNA-seq identified differentially expressed genes (DEGs) between the first and second samples. Biological pathway enrichment analysis was performed with Ingenuity® Pathway Analysis (IPA). A total of 16,640 genes were identified and 218 were significant DEGs after ICH (false discovery rate <0.1). IPA identified 97 disease and functional categories that were significantly upregulated (z-score >2) post-ICH; 46 categories were specifically related to immune cell activation, 22 to general cellular activation processes, and 4 to other inflammation-related responses. In the canonical pathway and network analysis, inflammatory mediators of particular importance included interleukin-8, NF-κB, ERK1/2, and members of the integrin class. ICH induced peripheral blood gene expression at 72 to 96 h compared with 0 to 24 h from symptom onset. DEGs that were highly expressed included those related to inflammation and activation of the immune response. Further research is needed to determine whether these changes affect outcomes and may represent new therapeutic targets.
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Affiliation(s)
- Kyle B Walsh
- 1 University of Cincinnati Gardner Neuroscience Institute, Cincinnati, Ohio.,2 Department of Emergency Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Xiang Zhang
- 3 Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio
| | - Xiaoting Zhu
- 4 Division of Biomedical Informatics, Cincinnati Children's Research Foundation, Cincinnati, Ohio
| | - Eric Wohleb
- 5 Department of Pharmacology and Systems Physiology, University of Cincinnati, Cincinnati, Ohio.,6 University of Cincinnati Neurobiology Research Center, Cincinnati, Ohio
| | - Daniel Woo
- 1 University of Cincinnati Gardner Neuroscience Institute, Cincinnati, Ohio.,7 Department of Neurology and Rehabilitation Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Long Lu
- 4 Division of Biomedical Informatics, Cincinnati Children's Research Foundation, Cincinnati, Ohio
| | - Opeolu Adeoye
- 1 University of Cincinnati Gardner Neuroscience Institute, Cincinnati, Ohio.,2 Department of Emergency Medicine, University of Cincinnati, Cincinnati, Ohio
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Jia YN, Peng YL, Zhao YP, Cheng XF, Zhou Y, Chai CL, Zeng LS, Pan MH, Xu L. Comparison of the Hepatoprotective Effects of the Three Main Stilbenes from Mulberry Twigs. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:5521-5529. [PMID: 31012578 DOI: 10.1021/acs.jafc.8b07245] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The purpose of this study was to compare the hepatoprotective effects of Oxy (oxyresveratrol), Res (resveratrol), and MulA (mulberroside A) (80 mg/kg body weight/d, i.g.) on acute liver injury (ALI) induced by lipopolysaccharide (LPS)/d-galactosamine (d-GalN) in mice. After 7 h of LPS (50 μg/kg body weight, i.p.) and d-GalN (500 mg/kg body weight, i.p.) exposure, the activities of serum transaminases and antioxidant enzymes were determined. The expressions of the Kelch-like ECH-associated protein 1 (Keap1)-nuclear factor erythroid 2-related factor 2 (Nrf2) signal pathway, the nuclear factor-kappa B (NF-κB) signal pathway, and the mitogen-activated protein kinase (MAPK) signal pathway related proteins were evaluated by Western blot assays. Histopathological analysis was performed by hematoxylin-eosin (H&E) staining on the separated livers of mice. The results showed that treatment with Oxy, Res, and MulA could significantly decreases the levels of alanine transaminase (ALT) and aspartate transaminase (AST) ( P < 0.01). MulA was the most effective ingredient among the three, and the ALT and AST levels were reduced at 90.3 ± 1.3% and 93.9 ± 1.1% compared with the LPS/D-GalN treated group ( P < 0.01). Meanwhile, the stilbenes curbed the expression of inflammatory factors, NF-κB pathway activation, and MAPKs phosphorylation and upregulated antioxidant enzymes, Nrf2, NAD (P) H:quinone oxidoreductase (NQO1), and heme oxygenase-1 (HO-1) expression levels. Stilbenes might protect the ALI caused by LPS/d-GalN through inhibiting the negative effectiveness of oxidation stress and inflammation. The protective performance of MulA was better than those of Oxy and Res, and we hypothesize that it might be due to the mediation of the specific metabolic pathway of the MulA in vivo. All of these results implied that stilbenes in mulberry twigs might be promising as natural additives.
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Affiliation(s)
- Ya-Nan Jia
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
| | - Ya-Lin Peng
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - Yi-Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - Xi-Fei Cheng
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - You Zhou
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - Chun-Li Chai
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - Ling-Shu Zeng
- Chongqing Sericulture Science and Technology Research Institute , No. 1 Shangba Road, Dongyang Street , Beibei District, Chongqing 400700 , China
| | - Min-Hui Pan
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
| | - Li Xu
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology , Southwest University , Chongqing 400715 , China
- Key Laboratory of Sericultural Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, College of Biotechnology, Southwest University , Chongqing 400715 , China
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Khalaf FK, Dube P, Mohamed A, Tian J, Malhotra D, Haller ST, Kennedy DJ. Cardiotonic Steroids and the Sodium Trade Balance: New Insights into Trade-Off Mechanisms Mediated by the Na⁺/K⁺-ATPase. Int J Mol Sci 2018; 19:E2576. [PMID: 30200235 PMCID: PMC6165267 DOI: 10.3390/ijms19092576] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 08/24/2018] [Accepted: 08/26/2018] [Indexed: 02/06/2023] Open
Abstract
In 1972 Neal Bricker presented the "trade-off" hypothesis in which he detailed the role of physiological adaptation processes in mediating some of the pathophysiology associated with declines in renal function. In the late 1990's Xie and Askari published seminal studies indicating that the Na⁺/K⁺-ATPase (NKA) was not only an ion pump, but also a signal transducer that interacts with several signaling partners. Since this discovery, numerous studies from multiple laboratories have shown that the NKA is a central player in mediating some of these long-term "trade-offs" of the physiological adaptation processes which Bricker originally proposed in the 1970's. In fact, NKA ligands such as cardiotonic steroids (CTS), have been shown to signal through NKA, and consequently been implicated in mediating both adaptive and maladaptive responses to volume overload such as fibrosis and oxidative stress. In this review we will emphasize the role the NKA plays in this "trade-off" with respect to CTS signaling and its implication in inflammation and fibrosis in target organs including the heart, kidney, and vasculature. As inflammation and fibrosis exhibit key roles in the pathogenesis of a number of clinical disorders such as chronic kidney disease, heart failure, atherosclerosis, obesity, preeclampsia, and aging, this review will also highlight the role of newly discovered NKA signaling partners in mediating some of these conditions.
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Affiliation(s)
- Fatimah K Khalaf
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Prabhatchandra Dube
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Amal Mohamed
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Jiang Tian
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Deepak Malhotra
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - Steven T Haller
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
| | - David J Kennedy
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Health Education Building RM 205, 3000 Arlington Ave, Toledo, OH 43614, USA.
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10
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Sheng L, Jena PK, Hu Y, Liu HX, Nagar N, Kalanetra KM, French SW, French SW, Mills DA, Wan YJY. Hepatic inflammation caused by dysregulated bile acid synthesis is reversible by butyrate supplementation. J Pathol 2017; 243:431-441. [PMID: 28892150 DOI: 10.1002/path.4983] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 08/14/2017] [Accepted: 09/06/2017] [Indexed: 12/16/2022]
Abstract
Dysregulated bile acid (BA) synthesis or reduced farnesoid X receptor (FXR) levels are found in patients having metabolic diseases, autoimmune hepatitis, and liver cirrhosis or cancer. The objective of this study was to establish the relationship between butyrate and dysregulated BA synthesis-induced hepatitis as well as the effect of butyrate in reversing the liver pathology. Wild-type (WT) and FXR knockout (KO) male mice were placed on a control (CD) or western diet (WD) for 15 months. In the presence or absence of butyrate supplementation, feces obtained from 15-month-old WD-fed FXR KO mice, which had severe hepatitis and liver tumors, were transplanted to 7-month-old WD-fed FXR KO for 3 months. Hepatic phenotypes, microbiota profile, and BA composition were analyzed. Butyrate-generating bacteria and colonic butyrate concentration were reduced due to FXR inactivation and further reduced by WD intake. In addition, WD-fed FXR KO male mice had the highest concentration of hepatic β-muricholic acid (β-MCA) and bacteria-generated deoxycholic acid (DCA) accompanied by serious hepatitis. Moreover, dysregulated BA and reduced SCFA signaling co-existed in both human liver cancers and WD-fed FXR KO mice. Microbiota transplantation using butyrate-deficient feces derived from 15-month-old WD-fed FXR KO mice increased hepatic lymphocyte numbers as well as hepatic β-MCA and DCA concentrations. Furthermore, butyrate supplementation reduced hepatic β-MCA as well as DCA and eliminated hepatic lymphocyte infiltration. In conclusion, reduced butyrate contributes to the development of hepatitis in the FXR KO mouse model. In addition, butyrate reverses dysregulated BA synthesis and its associated hepatitis. Copyright © 2017 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Lili Sheng
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA
| | - Prasant Kumar Jena
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA
| | - Ying Hu
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA
| | - Hui-Xin Liu
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA
| | - Nidhi Nagar
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA.,Department of Biological Sciences, California State University, East Bay, Hayward, CA, USA
| | - Karen M Kalanetra
- Department of Food Science and Technology, Department of Viticulture and Enology, University of California, Davis, CA, USA
| | | | - Samuel Wheeler French
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - David A Mills
- Department of Food Science and Technology, Department of Viticulture and Enology, University of California, Davis, CA, USA
| | - Yu-Jui Yvonne Wan
- Department of Medical Pathology and Laboratory Medicine, University of California, Davis, Sacramento, CA, USA
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Tcherniuk S, Cenac N, Comte M, Frouard J, Errazuriz-Cerda E, Galabov A, Morange PE, Vergnolle N, Si-Tahar M, Alessi MC, Riteau B. Formyl Peptide Receptor 2 Plays a Deleterious Role During Influenza A Virus Infections. J Infect Dis 2016; 214:237-47. [PMID: 27034344 DOI: 10.1093/infdis/jiw127] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 03/25/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The pathogenesis of influenza A virus (IAV) infections is a multifactorial process that includes the replication capacity of the virus and a harmful inflammatory response to infection. Formyl peptide receptor 2 (FPR2) emerges as a central receptor in inflammatory processes controlling resolution of acute inflammation. Its role in virus pathogenesis has not been investigated yet. METHODS We used pharmacologic approaches to investigate the role of FPR2 during IAV infection in vitro and in vivo. RESULTS In vitro, FPR2 expressed on A549 cells was activated by IAV, which harbors its ligand, annexin A1, in its envelope. FPR2 activation by IAV promoted viral replication through an extracellular-regulated kinase (ERK)-dependent pathway. In vivo, activating FPR2 by administering the agonist WKYMVm-NH2 decreased survival and increased viral replication and inflammation after IAV infection. This effect was abolished by treating the mice with U0126, a specific ERK pathway inhibitor, showing that, in vivo, the deleterious role of FPR2 also occurs through an ERK-dependent pathway. In contrast, administration of the FPR2 antagonist WRW4 protected mice from lethal IAV infections. CONCLUSIONS These data show that viral replication and IAV pathogenesis depend on FPR2 signaling and suggest that FPR2 may be a promising novel strategy to treat influenza.
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Affiliation(s)
- Sergey Tcherniuk
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR_S 1062 INRA, UMR_INRA 1260, France Aix Marseille Université
| | - Nicolas Cenac
- IRSD, Université de Toulouse, INSERM, INRA, INP-ENVT, Université de Toulouse 3 Paul Sabatier
| | | | | | | | - Angel Galabov
- Bulgarian Academy of Sciences, Stephan Angeloff Institute of Microbiology, Sofia
| | - Pierre-Emmanuel Morange
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR_S 1062 INRA, UMR_INRA 1260, France Aix Marseille Université
| | - Nathalie Vergnolle
- IRSD, Université de Toulouse, INSERM, INRA, INP-ENVT, Université de Toulouse 3 Paul Sabatier
| | - Mustapha Si-Tahar
- Inserm U1100 - Centre d'études des pathologies respiratoires Université F. Rabelais, Tours, France
| | - Marie-Christine Alessi
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR_S 1062 INRA, UMR_INRA 1260, France Aix Marseille Université
| | - Béatrice Riteau
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR_S 1062 INRA, UMR_INRA 1260, France Aix Marseille Université
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12
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Seo MJ, Lee YJ, Hwang JH, Kim KJ, Lee BY. The inhibitory effects of quercetin on obesity and obesity-induced inflammation by regulation of MAPK signaling. J Nutr Biochem 2015; 26:1308-16. [PMID: 26277481 DOI: 10.1016/j.jnutbio.2015.06.005] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/27/2015] [Accepted: 06/13/2015] [Indexed: 12/20/2022]
Abstract
Quercetin is a flavonoid found in fruits, vegetables, leaves and grains. It has inhibitory, antiviral, antiasthma, anticancer and antiinflammatory effects. Research has suggested that obesity is linked to metabolic disorders. In this study, we examined the inhibitory effect of quercetin on lipid accumulation and obesity-induced inflammation using 3T3-L1, RAW264.7, zebrafish and mouse models. Quercetin suppressed protein levels of the key adipogenic factors C/EBPβ, C/EBPα, PPARγ and FABP4 and the TG-synthesis enzymes lipin1, DGAT1 and LPAATθ. Activation of m-TOR and p70S6K, which are related to insulin and adipogenesis, was down-regulated during adipogenesis in 3T3-L1 cells. Recent research suggested that MAPK signaling factors were involved in adipogenesis and inflammation and that the adipokines MCP-1 and TNF-α attracted macrophages into adipose tissue. Our data showed that quercetin inhibited the MAPK signaling factors ERK1/2, JNK and p38MAPK and MCP-1 and TNF-α in adipocytes and macrophages. Quercetin also inhibited secretion of the inflammatory cytokines IL-1β and IL-6 and stimulated that of IL-10, an antiinflammatory cytokine. In this study, we confirmed the inhibitory effects of quercetin in adipogenesis and inflammation using a mouse model. In mice, quercetin reduced body weight (almost 40%) and suppressed expression of adipogenic, lipogenic and inflammation-related cytokines. Our data demonstrated that quercetin inhibits lipid accumulation and obesity-induced inflammation in the cell and animal models. Our study suggested that quercetin may represent a potential therapeutic agent for other metabolic disorders by regulating obesity and obesity-induced inflammation.
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Affiliation(s)
- Min-Jung Seo
- Department of Food Science and Biotechnology, CHA University, Seongnam, Kyonggi 463-400, South Korea
| | - Yeon-Joo Lee
- Department of Food Science and Biotechnology, CHA University, Seongnam, Kyonggi 463-400, South Korea
| | - Ji-Hyun Hwang
- Department of Food Science and Biotechnology, CHA University, Seongnam, Kyonggi 463-400, South Korea
| | - Kui-Jin Kim
- Department of Medicine, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA 02129, USA
| | - Boo-Yong Lee
- Department of Food Science and Biotechnology, CHA University, Seongnam, Kyonggi 463-400, South Korea.
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Abstract
UNLABELLED In addition to transporting ions, the multisubunit Na(+),K(+)-ATPase also functions by relaying cardiotonic steroid (CTS)-binding-induced signals into cells. In this study, we analyzed the role of Na(+),K(+)-ATPase and, in particular, of its ATP1A1 α subunit during coronavirus (CoV) infection. As controls, the vesicular stomatitis virus (VSV) and influenza A virus (IAV) were included. Using gene silencing, the ATP1A1 protein was shown to be critical for infection of cells with murine hepatitis virus (MHV), feline infectious peritonitis virus (FIPV), and VSV but not with IAV. Lack of ATP1A1 did not affect virus binding to host cells but resulted in inhibited entry of MHV and VSV. Consistently, nanomolar concentrations of the cardiotonic steroids ouabain and bufalin, which are known not to affect the transport function of Na(+),K(+)-ATPase, inhibited infection of cells with MHV, FIPV, Middle East respiratory syndrome (MERS)-CoV, and VSV, but not IAV, when the compounds were present during virus inoculation. Cardiotonic steroids were shown to inhibit entry of MHV at an early stage, resulting in accumulation of virions close to the cell surface and, as a consequence, in reduced fusion. In agreement with an early block in infection, the inhibition of VSV by CTSs could be bypassed by low-pH shock. Viral RNA replication was not affected when these compounds were added after virus entry. The antiviral effect of ouabain could be relieved by the addition of different Src kinase inhibitors, indicating that Src signaling mediated via ATP1A1 plays a crucial role in the inhibition of CoV and VSV infections. IMPORTANCE Coronaviruses (CoVs) are important pathogens of animals and humans, as demonstrated by the recent emergence of new human CoVs of zoonotic origin. Antiviral drugs targeting CoV infections are lacking. In the present study, we show that the ATP1A1 subunit of Na(+),K(+)-ATPase, an ion transporter and signaling transducer, supports CoV infection. Targeting ATP1A1 either by gene silencing or by low concentrations of the ATP1A1-binding cardiotonic steroids ouabain and bufalin resulted in inhibition of infection with murine, feline, and MERS-CoVs at an early entry stage. Infection with the control virus VSV was also inhibited. Src signaling mediated by ATP1A1 was shown to play a crucial role in the inhibition of virus entry by ouabain and bufalin. These results suggest that targeting the Na(+),K(+)-ATPase using cardiotonic steroids, several of which are FDA-approved compounds, may be an attractive therapeutic approach against CoV and VSV infections.
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Lee HJ, Shin YK, Park HT. Mitogen Activated Protein Kinase Family Proteins and c-jun Signaling in Injury-induced Schwann Cell Plasticity. Exp Neurobiol 2014; 23:130-7. [PMID: 24963277 PMCID: PMC4065826 DOI: 10.5607/en.2014.23.2.130] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 05/21/2014] [Accepted: 05/21/2014] [Indexed: 12/31/2022] Open
Abstract
Schwann cells (SCs) in the peripheral nerves myelinate axons during postnatal development to allow saltatory conduction of nerve impulses. Well-organized structures of myelin sheathes are maintained throughout life unless nerves are insulted. After peripheral nerve injury, unidentified signals from injured nerves drive SC dedifferentiation into an immature state. Dedifferentiated SCs participate in axonal regeneration by producing neurotrophic factors and removing degenerating nerve debris. In this review, we focus on the role of mitogen activated protein kinase family proteins (MAP kinases) in SC dedifferentiation. In addition, we will highlight neuregulin 1 and the transcription factor c-jun as upstream and downstream signals for MAP kinases in SC responses to nerve injury.
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Affiliation(s)
- Hye Jeong Lee
- Department of Pharmacology, Mitochondria Hub Regulation Center (MHRC), College of Medicine, Dong-A University, Busan 602-714, Korea
| | - Yoon Kyung Shin
- Department of Physiology, Mitochondria Hub Regulation Center (MHRC), College of Medicine, Dong-A University, Busan 602-714, Korea
| | - Hwan Tae Park
- Department of Physiology, Mitochondria Hub Regulation Center (MHRC), College of Medicine, Dong-A University, Busan 602-714, Korea
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15
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Liu Q, Wang J, Liang Q, Wang D, Luo Y, Li J, Janicki JS, Fan D. Sparstolonin B attenuates hypoxia-reoxygenation-induced cardiomyocyte inflammation. Exp Biol Med (Maywood) 2014; 239:376-84. [PMID: 24477822 DOI: 10.1177/1535370213517620] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Myocardial ischemia-reperfusion (MIR) injury is characterized by a rapid increase in cytokines and chemokines and an infiltration of inflammatory cells. Toll-like receptors (TLRs) 2 and 4 mediate these inflammatory responses. Herein we investigated the ability of Sparstolonin B (SsnB), a new selective TLR2/4 antagonist, to inhibit the TLR2/4-mediated inflammatory responses during cardiomyocyte hypoxia-reoxygenation injury as well as the responsible mechanisms. Lactate dehydrogenase (LDH) assay was performed to measure the cytotoxicity of SsnB on H9c2 cardiomyocytes. Quantitative real-time PCR (qRT-PCR) confirmed that TLR2 and TLR4 expression was elevated during hypoxia-reoxygenation, and that their up-regulation in cardiomyocytes was significantly inhibited by SsnB (P < 0.05). Both the mRNA and protein levels of monocyte chemotactic protein-1 and high mobility group box 1 were up-regulated during hypoxia-reoxygenation and were significantly attenuated by SsnB (P < 0.05). Next we found that extracellular signal-regulated kinase 1 or 2 (ERK1/2) and c-Jun NH2-terminal kinase (JNK) signaling pathways were activated during hypoxia-reoxygenation and SsnB significantly inhibited their activation (P < 0.05). Moreover, transwell migration assays revealed that the migration of mouse macrophages to hypoxia-reoxygenation injured cardiomyocytes was significantly reduced by SsnB (P < 0.05). In conclusion, our data indicate that the new selective TLR2 and TLR4 antagonist, SsnB, can substantially attenuate hypoxia-reoxygenation-induced inflammation of cardiomyocytes via inhibiting ERK1/2 and JNK signaling pathways. Accordingly, SsnB has the potential to serve as a therapeutic agent for the prevention of MIR injury.
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Affiliation(s)
- Qing Liu
- Department of Cell Biology and Anatomy, University of South Carolina School of Medicine, Columbia, SC 29209, USA
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16
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Morikawa T, Sueyoshi M, Chaipech S, Matsuda H, Nomura Y, Yabe M, Matsumoto T, Ninomiya K, Yoshikawa M, Pongpiriyadacha Y, Hayakawa T, Muraoka O. Suppressive effects of coumarins from Mammea siamensis on inducible nitric oxide synthase expression in RAW264.7 cells. Bioorg Med Chem 2012; 20:4968-77. [DOI: 10.1016/j.bmc.2012.06.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 06/16/2012] [Accepted: 06/18/2012] [Indexed: 01/20/2023]
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17
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Chen Y, Guo Q, Zhang B, Kang M, Xie Q, Wu Y. Bufalin enhances the antitumor effect of gemcitabine in pancreatic cancer. Oncol Lett 2012. [PMID: 23205102 DOI: 10.3892/ol.2012.783] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Bufalin, an active component of the Chinese medicine chan'su, has been reported to have an inhibitory effect on the growth of various types of cancer cells. In the present study, we investigated whether gemcitabine combined with bufalin enhanced the antitumor efficacy in pancreatic cancer. Three pancreatic cancer cell lines (Bxpc-3, Mia PaCa-2 and Panc-1) were treated with gemcitabine and/or bufalin in vitro. The combination treatment demonstrated greater inhibition of cellular growth and apoptosis. The activity of apoptosis signal-regulating kinase 1 (ASK1)/JNK was upregulated in gemcitabine-induced apoptosis when combined with bufalin. We also observed that tumor growth was significantly inhibited by the combination therapy in a tumor-bearing mouse model, and upregulation of ASK1 activity was validated by immunohistochemical staining. These results suggest that bufalin may be a potential chemotherapeutic agent for pancreatic cancer, which could enhance the antitumor efficacy of gemcitabine when used in combination, possibly through the activation of ASK1/JNK.
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Affiliation(s)
- Ying Chen
- Department of Surgery, Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
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18
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Sae-Wong C, Matsuda H, Tewtrakul S, Tansakul P, Nakamura S, Nomura Y, Yoshikawa M. Suppressive effects of methoxyflavonoids isolated from Kaempferia parviflora on inducible nitric oxide synthase (iNOS) expression in RAW 264.7 cells. JOURNAL OF ETHNOPHARMACOLOGY 2011; 136:488-495. [PMID: 21251970 DOI: 10.1016/j.jep.2011.01.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Revised: 12/03/2010] [Accepted: 01/10/2011] [Indexed: 05/30/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The rhizomes of Kaempferia parviflora Wall. ex Baker have been traditionally used in Thailand to treat abscesses, gout, and peptic ulcers. AIM Previously, we reported that the chloroform fraction of a Kaempferia parviflora extract had an inhibitory effect on rat paw-edema. In the present study, we isolated the constituents of this fraction and investigated the anti-inflammatory mechanism against nitric oxide (NO) production, tumor necrosis factor-α (TNF-α) and the expression of inducible nitric oxide synthase (iNOS) as well as phosphorylated extracellular signal-regulated kinase (p-ERK), and phosphorylated c-Jun N-terminal kinase (p-JNK). In addition, effects of trimethylapigenin (4) on the enzyme activities of protein kinases possibly leading to iNOS expression were examined to clarify the targets. MATERIALS AND METHODS The chloroform fraction was isolated using silica gel column chromatography and HPLC. Isolated compounds were tested against NO and TNF-α using RAW264.7 cells. Cytotoxicity and iNOS, p-ERK and p-JNK expression were also examined. RESULTS Three active components, 5,7-dimethoxyflavone (2), trimethylapigenin (4), and tetramethylluteolin (5), markedly inhibited the production of NO in lipopolysaccharide (LPS)-activated RAW264.7 cells. Compounds 2, 4, and 5 moderately inhibited production of TNF-α. Compounds 2, 4, and 5 strongly inhibited expression of iNOS mRNA and iNOS protein in a dose-dependent manner, but did not inhibit p-ERK or p-JNK protein expression. The most active compound, 4, did not inhibit the enzyme activity of inhibitor of κB kinases or mitogen-activated protein kinases, but inhibited that of spleen tyrosine kinase (SYK). CONCLUSION The mechanism responsible for the anti-inflammatory activity of methoxyflavonoids from the chloroform fraction of the rhizomes of Kaempferia parviflora is mainly the inhibition of iNOS expression, and the inhibition of SYK by 4 may be involved in the suppression of LPS-induced signaling in macrophages.
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Affiliation(s)
- Chutha Sae-Wong
- Faculty of Pharmaceutical Sciences, Prince of Songkla University, Songkhla, Thailand
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19
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Xu GX, Wang TT. Apoptosis of lens epithelial cells induced by cinobufagin in vitro. Int J Ophthalmol 2010; 3:128-31. [PMID: 22553535 DOI: 10.3980/j.issn.2222-3959.2010.02.08] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Accepted: 05/17/2010] [Indexed: 11/02/2022] Open
Abstract
AIM To investigate the in vitro effects and mechanism of action of cinobufacini on apoptosis of lens epithelial cells (LEC). METHODS Rabbit LEC were cultured for 72 hours with cinobufacini at different concentrations(0.0 [control], 0.1, 0.2, 0.3mg/L). The inhibition ratio of cinobufacini acting on LEC was analyzed by ethyl thiazolyl tetrazolium(MTT); the changes in DNA structure, by electrophoresis, and the apoptosis rate, by flow cytometry. The mRNA expression of apoptosis-related genes bcl-2 and bax was examined using the reverse transcription-polymerase chain reaction (RT-PCR). RESULTS At concentrations of 0.1mg/L-0.3mg/L, cinobufacini inhibited LEC proliferation. The inhibition ratio increased as the concentration of the drug increased. The typical DNA-ladders on electrophoretic gels were observed for extracts of LEC in the treated groups. The higher the drug concentration (0.1, 0.2, and 0.3mg/L) was, the higher the apoptosis rate (20.47±0.65%, 27.14±0.95%, and 33.49±0.77%, respectively) would be. The apoptosis rates in these groups were significantly different from those of the control group (P<0.01). With the drug concentration increasing, the mRNA expression levels of the pro-apoptotic bax increased, whereas those of the anti-apoptotic bcl-2 decreased. CONCLUSION Cinobufacini can notably induce apoptosis of LEC by decreasing the ratio of bcl-2 to baxin vitro. With its low toxicity, this medication may be effective in the prevention and treatment of posterior capsule opacification.
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Affiliation(s)
- Guo-Xing Xu
- Ophthalmic Institute of Fujian Province, the First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, Fujian Province, China
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Dowell ML, Lavoie TL, Lakser OJ, Dulin NO, Fredberg JJ, Gerthoffer WT, Seow CY, Mitchell RW, Solway J. MEK modulates force-fluctuation-induced relengthening of canine tracheal smooth muscle. Eur Respir J 2010; 36:630-7. [PMID: 20110395 DOI: 10.1183/09031936.00160209] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Tidal breathing, and especially deep breathing, is known to antagonise bronchoconstriction caused by airway smooth muscle (ASM) contraction; however, this bronchoprotective effect of breathing is impaired in asthma. Force fluctuations applied to contracted ASM in vitro cause it to relengthen, force-fluctuation-induced relengthening (FFIR). Given that breathing generates similar force fluctuations in ASM, FFIR represents a likely mechanism by which breathing antagonises bronchoconstriction. Thus it is of considerable interest to understand what modulates FFIR, and how ASM might be manipulated to exploit this phenomenon. It was demonstrated previously that p38 mitogen-activated protein kinase (MAPK) signalling regulates FFIR in ASM strips. Here, it was hypothesised that the MAPK kinase (MEK) signalling pathway also modulates FFIR. In order to test this hypothesis, changes in FFIR were measured in ASM treated with the MEK inhibitor, U0126 (1,4-diamino-2,3-dicyano-1,4-bis[2-aminophenylthio]butadiene). Increasing concentrations of U0126 caused greater FFIR. U0126 reduced extracellular signal-regulated kinase 1/2 phosphorylation without affecting isotonic shortening or 20-kDa myosin light chain and p38 MAPK phosphorylation. However, increasing concentrations of U0126 progressively blunted phosphorylation of high-molecular-weight caldesmon (h-caldesmon), a downstream target of MEK. Thus changes in FFIR exhibited significant negative correlation with h-caldesmon phosphorylation. The present data demonstrate that FFIR is regulated through MEK signalling, and suggest that the role of MEK is mediated, in part, through caldesmon.
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Affiliation(s)
- M L Dowell
- Section of Pulmonary Medicine, Dept of Pediatrics, The University of Chicago, 5841 S. Maryland Avenue, MC4064, Chicago, IL 60637, USA.
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Effect of nitric oxide donor and gamma irradiation on modifications of ERK and JNK in murine peritoneal macrophages. J Cell Commun Signal 2008; 1:219-26. [PMID: 18523870 DOI: 10.1007/s12079-008-0021-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Accepted: 04/29/2008] [Indexed: 01/13/2023] Open
Abstract
Mitogen activated protein kinases (MAPKs) play an important role in activation, differentiation and proliferation of macrophages. Macrophages, upon activation, produce large amounts of nitric oxide that inhibit the growth of variety of microorganisms and tumor cells. This nitric oxide which is known to interfere with tyrosine phosphorylation may result in changes in the pattern of activation of MAPKs. In a previous study we have found that tyrosine phosphorylation of MAPKs was completely abolished in the presence of nitric oxide donor and radiation but this did not affect the function of macrophages. In this study the other post translational modifications namely nitration and ubiquitination of JNK and ERK have been looked at. Both ERK and JNK were found to be nitrated. However, there was no increase in ubiquitination of ERK and JNK, indicating that ubiquitination, in this case was not a natural consequence of nitration and may serve in signaling. Additionally, when the nitration was extensive, phosphorylation was also inhibited. The activation of substrates of ERK and JNK were looked at to determine the consequences of such modifications. Inhibition of phosphorylation and extensive nitration of JNK did not prevent activation of its substrate, c-jun. This study indicates that ERK and JNK may be under regulation by different type of modifications in macrophages.
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Up-regulation of the Cbl family of ubiquitin ligases is involved in ATRA and bufalin-induced cell adhesion but not cell differentiation. Biochem Biophys Res Commun 2007; 367:183-9. [PMID: 18164258 DOI: 10.1016/j.bbrc.2007.12.120] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Accepted: 12/19/2007] [Indexed: 11/22/2022]
Abstract
The Casitas B-lineage Lymphoma (Cbl) family of ubiquitin ligases is multifunctional proteins that play important roles in different cell signaling pathways. It has been reported that c-Cbl and Cbl-b mRNAs are up-regulated during TPA-induced U937 and HL-60 cell differentiation. But the mechanism of the up-regulation and the roles of the Cbl family of ubiquitin ligases still remain unclear. In the present study, we demonstrated that bufalin enhanced all-trans retinoic acid (ATRA) induced differentiation of HL-60 cells, accompanied by up-regulation of the Cbl family of ubiquitin ligases. CsA, an inhibitor of calcium mobilization, reversed this up-regulation. Pretreatment with CsA and PS-341 did not affect the expression of CD11b, but suppressed the percentage of adherent cells. Lipid raft localization of Cbl-b enhanced cell adhesion, while C-terminal deletion partially suppressed the effect. Moreover, the expression of the adhesion-related kinases Pyk2 and Paxillin was up-regulated in parallel with the increase of Cbl proteins. These results suggested that up-regulation of c-Cbl and Cbl-b was involved in the regulation of ATRA and bufalin-induced HL-60 cell adhesion rather than cell differentiation, which might be mediated by lipid raft localization, ubiquitin ligase activity and C-terminal structure of Cbl proteins. Meanwhile, up-regulation of proline-rich tyrosine kinase (Pyk2) and Paxillin might also be implicated in this regulation.
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Schoner W, Scheiner-Bobis G. Endogenous and exogenous cardiac glycosides: their roles in hypertension, salt metabolism, and cell growth. Am J Physiol Cell Physiol 2007; 293:C509-36. [PMID: 17494630 DOI: 10.1152/ajpcell.00098.2007] [Citation(s) in RCA: 337] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Cardiotonic steroids (CTS), long used to treat heart failure, are endogenously produced in mammals. Among them are the hydrophilic cardenolide ouabain and the more hydrophobic cardenolide digoxin, as well as the bufadienolides marinobufagenin and telecinobufagin. The physiological effects of endogenous ouabain on blood pressure and cardiac activity are consistent with the "Na(+)-lag" hypothesis. This hypothesis assumes that, in cardiac and arterial myocytes, a CTS-induced local increase of Na(+) concentration due to inhibition of Na(+)/K(+)-ATPase leads to an increase of intracellular Ca(2+) concentration ([Ca(2+)](i)) via a backward-running Na(+)/Ca(2+) exchanger. The increase in [Ca(2+)](i) then activates muscle contraction. The Na(+)-lag hypothesis may best explain short-term and inotropic actions of CTS. Yet all data on the CTS-induced alteration of gene expression are consistent with another hypothesis, based on the Na(+)/K(+)-ATPase "signalosome," that describes the interaction of cardiac glycosides with the Na(+) pump as machinery activating various signaling pathways via intramembrane and cytosolic protein-protein interactions. These pathways, which may be activated simultaneously or selectively, elevate [Ca(2+)](i), activate Src and the ERK1/2 kinase pathways, and activate phosphoinositide 3-kinase and protein kinase B (Akt), NF-kappaB, and reactive oxygen species. A recent development indicates that new pharmaceuticals with antihypertensive and anticancer activities may be found among CTS and their derivatives: the antihypertensive rostafuroxin suppresses Na(+) resorption and the Src-epidermal growth factor receptor-ERK pathway in kidney tubule cells. It may be the parent compound of a new principle of antihypertensive therapy. Bufalin and oleandrin or the cardenolide analog UNBS-1450 block tumor cell proliferation and induce apoptosis at low concentrations in tumors with constitutive activation of NF-kappaB.
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Affiliation(s)
- Wilhelm Schoner
- Institut für Biochemie und Endokrinologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Frankfurter Str 100, Giessen, Germany.
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Borges de Oliveira-Junior E, Thomazzi SM, Rehder J, Antunes E, Condino-Neto A. Effects of BAY 41-2272, an activator of nitric oxide-independent site of soluble guanylate cyclase, on human NADPH oxidase system from THP-1 cells. Eur J Pharmacol 2007; 567:43-9. [PMID: 17499238 DOI: 10.1016/j.ejphar.2007.04.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2007] [Revised: 04/05/2007] [Accepted: 04/12/2007] [Indexed: 11/17/2022]
Abstract
We investigated the effects of the 5-cyclopropyl-2-[1-(2-fluoro-benzyl)-1H-pyrazolo[3,4-b] pyridin-3-yl]-pyrimidin-4-ylamine (BAY 41-2272) on the NADPH oxidase activity, gp91(phox) gene expression, cyclic guanosine-3',5'-monophosphate (cGMP) and cyclic adenosine-3',5'-monophosphate (cAMP) levels in the human myelomonocytic THP-1 cell line. THP-1 cells treated with BAY 41-2272 (0.3-10 microM) for 48 h significantly increased the superoxide anion (O(2)(*-)) release. This increase was not affected when cells were pre-treated with the specific cGMP-phosphodiesterase inhibitor zaprinast, the soluble guanylate cyclase inhibitor 1H-[1,2,4] oxidiazolo[4,3-alpha] quinoxalin-1-one (ODQ), the adenylate cyclase inhibitor 9-(tetrahydro-2-furanyl) adenine (SQ 22,536) or the nitric oxide synthase inhibitor N(omega)-nitro-l-arginine methyl ester (l-NAME). In addition, BAY 41-2272 (3 and 10 microM; 48 h) was able to increase gp91(phox) gene expression on THP-1 cells. The pre-treatment with zaprinast, 3-isobutyl-l-methyl-xanthine (IBMX; 0.5 mM), ODQ, SQ 22,536 or l-NAME caused no additional effect on the expression of gp91(phox) evoked by BAY 41-2272. Treatment of THP-1 cells with BAY 41-2272 caused a significant increase in cGMP and cAMP levels. Our findings show that BAY 41-2272 caused a significant increase on the O(2)(*-) release and gp91(phox) gene expression by THP-1 cells, and an elevation of intracellular cGMP and cAMP levels. However, we could not detect a clear correlation between both O(2)(*-) release and gp91(phox) gene expression with activation of cGMP and cAMP signaling pathways.
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25
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Seo GS, Lee SH, Choi SC, Choi EY, Oh HM, Choi EJ, Park DS, Kim SW, Kim TH, Nah YH, Kim S, Kim SH, You SH, Jun CD. Iron chelator induces THP-1 cell differentiation potentially by modulating intracellular glutathione levels. Free Radic Biol Med 2006; 40:1502-12. [PMID: 16632111 DOI: 10.1016/j.freeradbiomed.2005.12.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2005] [Revised: 11/12/2005] [Accepted: 12/19/2005] [Indexed: 11/21/2022]
Abstract
Iron chelators have been implicated to modulate certain inflammatory mediators and regulate inflammatory processes. Here we report that iron chelator deferoxamine (DFO) induces differentiation of monocytic THP-1 cells into functional macrophages. DFO rapidly phosphorylated both extracellular signal-regulated kinase (ERK) and p38 kinase. Blockade of ERK signaling by the MEK1/2 inhibitor PD098059 abolished DFO-induced class A scavenger receptor (SR-A) expression and phagocytic activity, indicating that ERK cascades mediate the induction of THP-1 differentiation. In contrast, in cells treated with the p38 inhibitor SB203580 or transfected with the dominant-negative variant of p38 kinase, DFO-mediated ERK activation became more prominent, and the induction of SR-A expression and phagocytic activity were significantly increased. Interestingly, differentiation by DFO was associated with decrease in cellular glutathione (GSH) level. Both MAPK inhibitors did not influence the GSH level; however, treatment with ferric citrate (Fe3+) or N-acetyl-cysteine, a major precursor of GSH, markedly recovered GSH level to a normal extent, along with the significant decrease of differentiation. Collectively, these results indicate that oxidative stress by DFO and the resulting activation of ERK cascade play dominant roles in the process of THP-1 differentiation, while p38 acts as a negative signal transmitter.
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Affiliation(s)
- Geom-Seog Seo
- Digestive Disease Research Institute, Wonkwang University School of Medicine, Iksan, Chonbuk 570-749, Korea
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26
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Lewthwaite JC, Bastow ER, Lamb KJ, Blenis J, Wheeler-Jones CPD, Pitsillides AA. A specific mechanomodulatory role for p38 MAPK in embryonic joint articular surface cell MEK-ERK pathway regulation. J Biol Chem 2006; 281:11011-8. [PMID: 16464862 DOI: 10.1074/jbc.m510680200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mechanisms regulating cell behavior and extracellular matrix composition in response to mechanical stimuli remain unresolved. Our previous studies have established that the MEK-ERK cascade plays a specific role in the mechano-dependent joint formation process by promoting the assembly of pericellular matrices reliant upon hyaluronan (HA) for their integrity. Here we demonstrate: (i) novel cross-talk between p38 MAPK and MEK-ERK signaling pathways that is specific for mechanical stimuli and (ii) a role for p38 MAPK in facilitating HA production by cells derived from the articular surface of embryonic chick tibiotarsal joints. We find that p38 MAPK blockade restricts pericellular assembly of HA-rich matrices and reduces basal as well as mechanical strain-induced release of HA. p38 MAPK blockers potentiated early strain-induced increases but restricted sustained increases in MEK/ERK phosphorylation at later times; c-Fos hyperphosphorylation at threonine 325 was found to parallel this p38 MAPK-mediated modulation of ERK activation. In contrast, p38 MAPK inhibitors had no detectable effect on the ERK activation induced by fibroblast growth factor 2 or pervanadate, a phosphatase inhibitor, and MEK inhibitors did not influence p38 MAPK phosphorylation, confirming both the specificity and unidirectionality of p38 MAPK-ERK cross-talk. Immunochemical and immunoblotting studies revealed constitutive p38 MAPK activation in cells at, or derived from, developing articular joint surfaces. Unlike the MEK-ERK pathway, however, p38 MAPK was not further stimulated by mechanical stimulation in vitro. Thus, p38 MAPK specifically facilitates ERK activation and downstream signaling in response to mechanical stimuli. These results suggest that constitutively active p38 MAPK serves an essential, permissive role in mechanically induced changes in ERK activation and in the accumulation of HA-rich extracellular matrices that serve a key role in joint development.
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Affiliation(s)
- Jo C Lewthwaite
- Department of Veterinary Basic Sciences, Royal Veterinary College, University of London, Royal College Street, London NW1 0TU, United Kingdom
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27
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Nadra I, Mason JC, Philippidis P, Florey O, Smythe CDW, McCarthy GM, Landis RC, Haskard DO. Proinflammatory Activation of Macrophages by Basic Calcium Phosphate Crystals via Protein Kinase C and MAP Kinase Pathways. Circ Res 2005; 96:1248-56. [PMID: 15905460 DOI: 10.1161/01.res.0000171451.88616.c2] [Citation(s) in RCA: 286] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Basic calcium phosphate (BCP) crystal deposition underlies the development of arterial calcification. Inflammatory macrophages colocalize with BCP deposits in developing atherosclerotic lesions and in vitro can promote calcification through the release of TNF alpha. Here we have investigated whether BCP crystals can elicit a proinflammatory response from monocyte-macrophages. BCP microcrystals were internalized into vacuoles of human monocyte-derived macrophages in vitro. This was associated with secretion of proinflammatory cytokines (TNFα, IL-1β and IL-8) capable of activating cultured endothelial cells and promoting capture of flowing leukocytes under shear flow. Critical roles for PKC, ERK1/2, JNK, but not p38 intracellular signaling pathways were identified in the secretion of TNF alpha, with activation of ERK1/2 but not JNK being dependent on upstream activation of PKC. Using confocal microscopy and adenoviral transfection approaches, we determined a specific role for the PKC-alpha isozyme. The response of macrophages to BCP crystals suggests that pathological calcification is not merely a passive consequence of chronic inflammatory disease but may lead to a positive feed-back loop of calcification and inflammation driving disease progression.
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Affiliation(s)
- Imad Nadra
- British Heart Foundation Cardiovascular Medicine Unit, Eric Bywaters Centre for Vascular Inflammation, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London, UK
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28
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Marvar PJ, Nurkiewicz TR, Boegehold MA. Reduced Arteriolar Responses to Skeletal Muscle Contraction after Ingestion of a High Salt Diet. J Vasc Res 2005; 42:226-36. [PMID: 15855795 DOI: 10.1159/000085461] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2003] [Accepted: 02/28/2005] [Indexed: 11/19/2022] Open
Abstract
We previously reported that in skeletal muscle arterioles of rats fed a very high salt (HS; 7%) diet, the bioavailability of endothelium-derived nitric oxide (NO) is reduced through scavenging by reactive oxygen species. Because arteriolar NO can play an important role in local blood flow control, we investigated whether arteriolar responses to increased tissue metabolism become compromised in skeletal muscle of salt-fed rats. Consumption of a HS (4%) diet for 4 weeks had no effect on arteriolar diameters, volume flow or shear stress in resting spinotrapezius muscle. Arteriolar responses to a modest elevation in metabolic demand (0.5 Hz contraction) were not different from those in rats fed a normal diet, but diameter responses to a greater elevation in metabolic demand (4 Hz contraction) were significantly less in HS rats than in rats fed a normal diet. In both groups, the NO synthase inhibitor N(G)-monomethyl-L-arginine reduced resting arteriolar diameters and flow by a similar amount and had little or no effect on arteriolar diameter or flow responses to muscle contraction. Arterioles in HS rats exhibited an increase in overall oxidant activity (tetranitroblue tetrazolium reduction) but not in superoxide activity (dihydroethidine oxidation). Reactive oxygen species scavengers (2,2,6,6-tetramethylpiperidine-N-oxyl and catalase) did not normalize the reduced arteriolar responses to muscle contraction in HS rats. These findings suggest that increased oxidant activity in the arteriolar network of salt-fed rats is not due to accumulation of superoxide anion and that neither this oxidant activity nor reduced NO availability can account for the blunted active arteriolar dilation in rats fed a 4% salt diet.
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Affiliation(s)
- Paul J Marvar
- Department of Physiology and Pharmacology, and Center for Interdisciplinary Research in Cardiovascular Sciences, West Virginia University School of Medicine, Morgantown, WV 265056-9229, USA
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Drenjancevic-Peric I, Lombard JH. Reduced Angiotensin II and Oxidative Stress Contribute to Impaired Vasodilation in Dahl Salt-Sensitive Rats on Low-Salt Diet. Hypertension 2005; 45:687-91. [PMID: 15710779 DOI: 10.1161/01.hyp.0000154684.40599.03] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigated the role of impaired angiotensin II (Ang II) modulation in contributing to reduced vascular relaxation in isolated middle cerebral arteries (MCA) (100 to 200 μm in diameter) of normotensive Dahl salt-sensitive (SS) rats maintained on low salt (LS) diet (0.4% NaCl) for 9 to 10 weeks. MCA from SS rats on LS diet (n=6 to 9) constricted in response to reduction of perfusate and superfusate PO
2
to 35 to 40 mm Hg or acetylcholine (ACh). Vasodilator responses to reduced PO
2
and ACh were restored in SS.13
BN
consomic rats that are 98% genetically identical to SS rats, but exhibit normal regulation of their renin-angiotensin system (RAS). This restored dilation could be prevented by feeding SS.13
BN
rats high-salt (HS) diet (4% NaCl) for 3 days to suppress Ang II. A continuous intravenous infusion of a subpressor dose (3 ng/kg per minute) of Ang II for 3 days restored vasodilator responses to ACh and reduced PO
2
in SS.13
BN
rats on HS diet and in SS rats on LS diet. Superoxide scavenging with tempol (100 μmol/L) restored vasodilator responses to ACh and reduced PO
2
in MCA of SS rats on LS diet, but did not affect vasodilator responses in MCA of SS.13
BN
rats on LS diet. These data indicate that exposure to chronically low Ang II levels leads to impaired vascular relaxation in SS rats, even when the animals are on LS diet and normotensive. This impaired relaxation appears to be mediated by increased levels of oxidative stress in the arteries.
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30
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Minami N, Mori N, Nagasaka M, Harada T, Kurosawa H, Kanazawa M, Kohzuki M. Effect of high-salt diet or chronic captopril treatment on exercise capacity in normotensive rats. Clin Exp Pharmacol Physiol 2004; 31:197-201. [PMID: 15053813 DOI: 10.1111/j.1440-1681.2004.03980.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
1. We investigated whether chronic suppression of the renin-angiotensin system, which is known to be associated with reductions in microvascular density and vasodilator responsiveness of skeletal muscle, could affect exercise capacity in normotensive rats. 2. Rats were placed on normal rat chow, normal rat chow with captopril (100 mg/kg per day) or a high-salt diet (HS; 4%) for 4 weeks. Following these interventions, rats with indwelling carotid artery catheters were submitted to stepwise increasing exercise on a motor treadmill at a speed of 10, 20 and 30 m/min for 4 min while blood lactate was measured. 3. Blood lactate after exercise at a speed of 20 m/min was significantly higher and the duration during which rats were able to run at a speed of 30 m/min was significantly shorter in captopril-treated rats and rats fed an HS diet compared with control rats. 4. We conclude that chronic treatment with captopril or HS diet could reduce the exercise capacity in inactive normotensive rats, probably through chronic inhibition of the renin-angiotensin system.
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Affiliation(s)
- Naoyoshi Minami
- Department of Internal Medicine and Rehabilitation Science, Tohoku University Graduate School of Medicine, Sendai, Japan.
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31
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Lai WC, Zhou M, Shankavaram U, Peng G, Wahl LM. Differential regulation of lipopolysaccharide-induced monocyte matrix metalloproteinase (MMP)-1 and MMP-9 by p38 and extracellular signal-regulated kinase 1/2 mitogen-activated protein kinases. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:6244-9. [PMID: 12794156 DOI: 10.4049/jimmunol.170.12.6244] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Signal transduction events in monocyte matrix metalloproteinase (MMP) production have been shown to include a PGE(2)-cAMP-dependent step. To determine earlier pathway components, we examined the role of mitogen-activated protein kinases (MAPKs) in the regulation of monocyte MMP-1 and MMP-9, two major MMPs induced by LPS. Stimulation with LPS resulted in the activation of the extracellular signal-regulated kinase 1 and 2 (ERK1/2) and mitogen-activated kinase p38. The p38-specific inhibitor SB203580 suppressed p38 activity and MMP-1 mRNA and protein, but increased ERK activity and MMP-9 mRNA and protein. In contrast, the MAPK kinase 1/2-specific inhibitor PD98059 inhibited MMP-1 and MMP-9. However, both MAPK inhibitors decreased the production of cyclooxygenase-2 and PGE(2), but only the inhibition of MMP-1 by SB203580 was reversed by PGE(2) or dibutyryl cAMP. Examination of the effect of these MAPK inhibitors on the promoters of MMP-1 and MMP-9 revealed that PD98059 inhibited the binding of transcription factors to all of the MMP promoter-specific complementary oligonucleotides tested. However, SB203580 only inhibited the binding of MMP-1-specific CREB and SP 1 oligonucleotides, which was reversed by PGE(2). Additionally, SB203580 enhanced transcription factor binding to the oligonucleotides complementary to a NF-kappaB site in the promoter of MMP-9. Thus, LPS induction of MMP-1 production by monocytes is regulated by both ERK1/2 and p38, whereas MMP-9 stimulation occurred mainly through the ERK1/2 pathway. Moreover, p38 regulates MMP-1 mainly through a PGE(2)-dependent pathway, whereas ERK1/2-mediated MMP-1 and MMP-9 production involves the activation of additional MMP promoter sites through a PGE(2)-independent mechanism.
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Affiliation(s)
- Wan-Ching Lai
- Immunopathology Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
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Drenjancevic-Peric I, Frisbee JC, Lombard JH. Skeletal muscle arteriolar reactivity in SS.BN13 consomic rats and Dahl salt-sensitive rats. Hypertension 2003; 41:1012-5. [PMID: 12682080 DOI: 10.1161/01.hyp.0000067061.26899.3e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Previous studies have demonstrated that angiotensin II is a crucial factor in maintaining normal vascular reactivity. In this study, we tested the hypothesis that altered reactivity to vasoactive stimuli in Dahl salt-sensitive (S) rats on a high salt diet could be prevented by introgression of chromosome 13 from the normotensive Brown Norway strain, which carries a normally functioning renin gene. Dahl S and consomic SS.BN13 rats were fed a low salt (0.4%) or high salt diet (4%) for 4 to 6 days or 4 weeks. Arteriolar responses to elevated superfusion solution PO2, acetylcholine, and sodium nitroprusside were assessed by videomicroscopy in the cremaster muscle. Arteriolar dilation to sodium nitroprusside was normal in both strains. Arteriolar constriction to elevated PO2 was enhanced in Dahl S and SS.BN13 rats on a high salt diet compared with responses in rats on a low salt diet. Arterioles of Dahl S rats on a high salt diet had an impaired dilation to acetylcholine, whereas dilator responses to acetylcholine were restored in SS.BN13 rats regardless of elevated salt intake. These data suggest that (1) restitution of normal renin control mechanisms by chromosomal transfer contributes to the recovery of dilator responses in SS.BN13 rats versus Dahl S rats but does not affect constrictor responses to oxygen, and (2) factors in the Dahl S genetic background contribute to an enhanced sensitivity of arterioles to elevated PO2 independent of elevated blood pressure.
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Affiliation(s)
- Ines Drenjancevic-Peric
- Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wis 53226, USA
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Dmitrieva RI, Doris PA. Cardiotonic steroids: potential endogenous sodium pump ligands with diverse function. Exp Biol Med (Maywood) 2002; 227:561-9. [PMID: 12192097 DOI: 10.1177/153537020222700803] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
The highly conserved cardiotonic steroid (CS) binding site present on the ubiquitous membrane sodium pump, sodium, potassium-ATPase, appears to have been conserved by no force other than its capacity to bind CS: a family that includes plant-derived cardiac glycosides and putative endogenous vertebrate counterparts. Binding of ligand is inhibited by increased extracellular potassium. This implies functional coordination because inhibition of the sodium pump would be counterproductive when extracellular potassium is elevated. The interesting biology of the CS binding site continues to stimulate investigations into the identity of endogenous ligands, their role as pump regulators at the cellular level, and as mediators of body fluid balance and blood pressure regulation. In addition to inhibition of sodium and potassium transport, there is considerable recent evidence suggesting that the sodium pump may act as a cell signaling receptor activated by CS binding and responding by coordination of intracellular signaling pathways that can be dependent on and also independent of the reduction in transmembrane ion flux resulting directly from pump inhibition. This signaling may influence cell survival, growth, and differentiation. Recent insight into the biology of pump regulation by CS is reviewed.
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Affiliation(s)
- Renata I Dmitrieva
- Institute of Molecular Medicine, University of Texas, Houston, Texas 77030, USA
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Roach SK, Schorey JS. Differential regulation of the mitogen-activated protein kinases by pathogenic and nonpathogenic mycobacteria. Infect Immun 2002; 70:3040-52. [PMID: 12010996 PMCID: PMC128028 DOI: 10.1128/iai.70.6.3040-3052.2002] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Mycobacteria are the etiologic agents of numerous diseases which account for significant morbidity and mortality in humans and other animal species. Many mycobacteria are intramacrophage pathogens and therefore the macrophage response to infection, which includes synthesis of cytokines such as tumor necrosis factor alpha (TNF-alpha) and production of nitric oxide, has important consequences for host immunity. However, very little is known about the macrophage cell signaling pathways initiated upon infection or how pathogenic mycobacteria may modulate the macrophage responses. Using primary murine bone marrow macrophages, we established that p38 and extracellular signal-regulated kinases 1 and 2 of the mitogen-activated protein kinase (MAPK) pathways are activated upon infection with different species of mycobacteria. However, we observed decreased MAPK activity over time in macrophages infected with pathogenic Mycobacterium avium strains relative to infections with nonpathogenic mycobacteria. Furthermore, macrophages infected with M. avium produced lower levels of TNF-alpha, interleukin 1beta, and inducible nitric oxide synthase 2 than macrophages infected with nonpathogenic species. Inhibitor studies indicate that the MAPKs are required for the Mycobacterium-mediated induction of these effector proteins. Our data indicate that MAPKs are activated in macrophages upon invasion by mycobacteria and that this activation is diminished in macrophages infected with pathogenic strains of M. avium, resulting in decreased production of important immune effector proteins. The decreased MAPK activation associated with M. avium infections suggests a novel point of immune intervention by this mycobacterial species.
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Affiliation(s)
- Shannon K Roach
- Department of Biology, Center of Tropical Disease Research and Training, University of Notre Dame, Notre Dame, Indiana 46617, USA.
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35
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Diament D, Brunialti MKC, Romero EC, Kallas EG, Salomao R. Peripheral blood mononuclear cell activation induced by Leptospira interrogans glycolipoprotein. Infect Immun 2002; 70:1677-83. [PMID: 11895929 PMCID: PMC127819 DOI: 10.1128/iai.70.4.1677-1683.2002] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Leptospira interrogans glycolipoprotein (GLP) has been implicated in pathological and functional derangement seen in leptospirosis. The goal of this study was to evaluate GLP's ability to induce cellular activation, as assessed by cytokine production and expression of surface activation markers. GLP extracted from either pathogenic L. interrogans serovar Copenhageni or nonpathogenic Leptospira biflexa serovar Patoc (GLPp) was used to stimulate peripheral blood mononuclear cell cultures from healthy donors. Supernatant cytokine levels were measured by enzyme-linked immunosorbent assay. Expression of CD69 and HLA-DR on lymphocytes and monocytes, as well as lipopolysaccharide (LPS) binding, were measured by flow cytometry. At 6 h of incubation, GLP induced a significant rise in tumor necrosis factor alpha levels, which dropped progressively until 72 h of incubation. Interleukin-10 peak levels were obtained at between 24 and 48 h, with sustained levels until 72 h of incubation. The response magnitude was proportional to the GLP dose. CD69 expression on T lymphocytes and monocytes increased significantly, as did HLA-DR expression on monocytes. GLPp induced no CD69 or HLA-DR expression. GLP did not block biotinylated LPS binding to monocytes, suggesting that different pathways are used to induce cell activation. In conclusion, GLP induces cellular activation and may play a major role in the pathogenesis of leptospirosis.
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Affiliation(s)
- Decio Diament
- Escola Paulista de Medicina, Federal University of São Paulo, Instituto de Infectologia Emilio Ribas, São Paulo, Brazil
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36
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Coyne C, Baravick J, Howell T, Baravick E, Willetto C, Fenwick BW. Biochemical mechanisms that interact with membrane-associated IL-1 RII (60-kDa decoy) receptors in populations of adherent macrophages and vascular endothelium. Cell Signal 2001; 13:765-76. [PMID: 11602187 DOI: 10.1016/s0898-6568(01)00196-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of this investigation was to identify the potential biochemical mechanisms that alter the integrity of membrane-associated IL-1 RII (decoy) receptor complexes expressed by populations of adherent macrophages and vascular endothelium. The initial research strategy utilized to achieve this objective involved delineating the ability of macrophage activation or exposure of macrophages and vascular endothelium to a spectrum of enzyme proteases to influence the expression of membrane-associated IL-1 RII (decoy) or generate soluble fragments of this receptor complex. Results from these investigations revealed that stimulated macrophages displayed proportional increases in both the expression of membrane-associated IL-1 RII (decoy) and release of soluble receptor fragments. Exposure of macrophages and vascular endothelium to the reference proteases discovered the ability of cathepsin-D to biochemically deplete membrane-associated IL-1 RII (decoy) in addition to generating soluble fragments of this receptor complex. Complementary investigations isolated a carboxyl/aspartate protease from activated macrophages utilizing pepstatin-A affinity chromatography. Exposure of vascular endothelium to pepstatin-A binding proteins resulted in a detectable depletion of membrane-associated IL-1 RII (decoy) and generation of soluble receptor fragments. Evaluation of pepstatin-A binding proteins by SDS-PAGE identified a primary protein fraction with a molecular mass of 47-52 kDa that closely correlates with the known molecular size of leukocyte cathepsin-D fractions. Macrophage pepstatin-A binding protein fractions evaluated by nondenaturing haemoglobin-substrate PAGE (Hb-PAGE) analysis detected a lucent proteolytic band at 47-52 kDa. Macrophage pepstatin-A binding proteins also hydrolyzed a synthetic enzyme-specific substrate that selectively recognizes cathepsin-D biochemical activity. In conclusion, the leukocyte carboxyl/aspartate protease cathepsin-D can biochemically alter the integrity and generate soluble fragments of membrane-associated IL-1 RII (60-kDa decoy) receptor complexes expressed by macrophages and vascular endothelium.
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Affiliation(s)
- C Coyne
- Veterinary Pharmacology Research Laboratory, Veterinary Research Programme, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS 39762, USA.
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Kurosawa M, Tani Y, Nishimura S, Numazawa S, Yoshida T. Distinct PKC isozymes regulate bufalin-induced differentiation and apoptosis in human monocytic cells. Am J Physiol Cell Physiol 2001; 280:C459-64. [PMID: 11171564 DOI: 10.1152/ajpcell.2001.280.3.c459] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bufalin, an Na(+)-K(+)-ATPase inhibitor, simultaneously induced cell differentiation and apoptosis in human monocytic leukemia THP-1 cells. In this study, we investigated the regulatory role of protein kinase C (PKC) isozymes in bufalin-induced cell differentiation and apoptosis. A PKC-specific but isozyme-nonselective inhibitor, Ro-31-8220, and a cPKC selective inhibitor, Gö-6976, caused significant attenuation of bufalin-induced interleukin-1beta (IL-1beta) gene expression, a mature monocytic marker, indicating that cPKC participates in the bufalin-induced cell differentiation. On the other hand, cPKCbeta- and nPKCdelta-defective THP-1/TPA cells displayed strong resistance to the bufalin-induced DNA ladder formation. Rottlerin, an nPKCdelta-specific inhibitor, partially attenuated preapoptotic effects of bufalin, such as the limited proteolysis of nPKCdelta and poly(ADP-ribose) polymerase and the cell staining by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling, suggesting that nPKCdelta is involved, at least in part, in bufalin-induced apoptosis. In contrast, Gö-6976 and rottlerin significantly augmented bufalin-induced apoptosis and differentiation, respectively. The findings suggest that bufalin-induced cell differentiation and apoptosis are interlinked and that distinct PKC isozymes are involved in the fate of the cell.
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Affiliation(s)
- M Kurosawa
- Department of Biochemical Toxicology, School of Pharmaceutical Sciences, Showa University, Tokyo 142-8555, Japan
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Affiliation(s)
- K. Murali Krishna Rao
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia
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