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Ghasemi SZ, Beigoli S, Memarzia A, Behrouz S, Gholamnezhad Z, Darroudi M, Amin F, Boskabady MH. Paraquat-induced systemic inflammation and oxidative stress in rats improved by Curcuma longa ethanolic extract, curcumin and a PPAR agonist. Toxicon 2023; 227:107090. [PMID: 36965712 DOI: 10.1016/j.toxicon.2023.107090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/14/2023] [Accepted: 03/19/2023] [Indexed: 03/27/2023]
Abstract
The effect of Curcuma longa (Cl) ethanolic extract, nano-curcumin (Cu) and a PPARγ activator, pioglitazone on inhaled paraquat (PQ)-induced systemic inflammation and oxidative stress was examined in the present study. Control rats were exposed to normal saline and PQ groups to 27 and 54 mg/m3 (PQ-L and PQ-H) aerosols. Nine other PQ-H groups were treated with Curcuma longa (Cl, 150 and 600 mg/kg/day), nano-curcumin (Cu, 2 and 8 mg/kg/day), pioglitazone (Pio, 5 and 10 mg/kg), low dose of Pio + Cl and Cu and dexamethasone (0.03 mg/kg/day) for 16 days after PQ exposure period (n = 8). Total and differential WBC counts, malondialdehyde (MDA) and TNF-α levels were increased but thiol, catalase (CAT), superoxide dismutase (SOD), IL-10 and IFN-γ levels were decreased in the blood in the both PQ groups (p < 0.05 to p < 0.001). Treatment with Dexa and both doses of Cl, Cu, and Pio improved all measured variables compared to the PQ-H group (p < 0.05 to p < 0.001). The improvements of most variables in the treated group with low dose of Pio + Cl and Cu were higher than the effects of three agents alone. Systemic inflammation and oxidative stress induced by inhaled PQ were improved by Cl, Cu and Pio. In addition, a synergic effect between Pio with those of Cl and Cu was shown, suggesting PPARγ mediated effects of the plant and its derivative Cu.
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Affiliation(s)
- Seyedeh Zahra Ghasemi
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran; Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran
| | - Sima Beigoli
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran
| | - Arghavan Memarzia
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran
| | - Sepideh Behrouz
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran; Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran
| | - Zahra Gholamnezhad
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran
| | - Majid Darroudi
- Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Fatemeh Amin
- Department of Clinical Biochemistry, Faculty of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Mohammad Hossein Boskabady
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran; Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, 9177948564, Iran.
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Kargozar S, Baino F, Hoseini SJ, Verdi J, Asadpour S, Mozafari M. Curcumin: footprints on cardiac tissue engineering. Expert Opin Biol Ther 2019; 19:1199-1205. [DOI: 10.1080/14712598.2019.1650912] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Saeid Kargozar
- Tissue Engineering Research Group (TERG), Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Francesco Baino
- Applied Science and Technology Department, Institute of Materials Physics and Engineering, Torino, Italy
| | - Seyed Javad Hoseini
- Department of Medical Biotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Javad Verdi
- Tissue Engineering & Applied Cell Sciences Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Shiva Asadpour
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Masoud Mozafari
- Cellular and Molecular Research Centre, Iran University of Medical Sciences, Tehran, Iran
- Department of Tissue Engineering and Regenerative Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
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Ahangari N, Kargozar S, Ghayour-Mobarhan M, Baino F, Pasdar A, Sahebkar A, Ferns GAA, Kim HW, Mozafari M. Curcumin in tissue engineering: A traditional remedy for modern medicine. Biofactors 2019; 45:135-151. [PMID: 30537039 DOI: 10.1002/biof.1474] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 10/12/2018] [Indexed: 01/15/2023]
Abstract
Curcumin is the principal polyphenolic compound present in turmeric with broad applications in tissue engineering and regenerative medicine. It has some important inherent properties with the potential to facilitate tissue healing, including anti-inflammatory, anti-oxidant, and antibacterial activities. Therefore, curcumin has been used for the treatment of various damaged tissues, especially wound injuries. There are different forms of curcumin, among which nano-formulations are of a great importance in regenerative medicine. It is also important to design sophisticated delivery systems for controlled/localized delivery of curcumin to the target tissues and organs. Although there are many reports on the advantages of this compound, further research is required to fully explore its clinical usage. The review describes the physicochemical and biological properties of curcumin and the current state of the evidence on its applications in tissue engineering. © 2018 BioFactors, 45(2):135-151, 2019.
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Affiliation(s)
- Najmeh Ahangari
- Department of Modern Sciences and Technologies, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Saeid Kargozar
- Department of Modern Sciences and Technologies, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Majid Ghayour-Mobarhan
- Department of Modern Sciences and Technologies, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Metabolic Syndrome Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Cardiovascular Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Francesco Baino
- Institute of Materials Physics and Engineering, Applied Science and Technology Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Alireza Pasdar
- Department of Modern Sciences and Technologies, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Division of Applied Medicine, Medical School, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
| | - Amirhossein Sahebkar
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Gordon A A Ferns
- Brighton and Sussex Medical School, Division of Medical Education, Rm 342, Mayfield House, University of Brighton, Brighton, UK
| | - Hae-Won Kim
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, South Korea
- Department of Biomaterials Science, School of Dentistry, Dankook University, Cheonan, South Korea
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine Research Center, Dankook University, Cheonan, South Korea
| | - Masoud Mozafari
- Bioengineering Research Group, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center (MERC), Tehran, Iran
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
- Department of Tissue Engineering and Regenerative Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
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Tian T, Wang Z, Zhang J. Pathomechanisms of Oxidative Stress in Inflammatory Bowel Disease and Potential Antioxidant Therapies. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4535194. [PMID: 28744337 PMCID: PMC5506473 DOI: 10.1155/2017/4535194] [Citation(s) in RCA: 334] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 05/22/2017] [Accepted: 05/31/2017] [Indexed: 12/22/2022]
Abstract
Inflammatory bowel disease (IBD) is a chronic gastrointestinal disease whose incidence has risen worldwide in recent years. Accumulating evidence shows that oxidative stress plays an essential role in the pathogenesis and progression of IBD. This review highlights the generation of reactive oxygen species (ROS) and antioxidant defense mechanisms in the gastrointestinal (GI) tract, the involvement of oxidative stress signaling in the initiation and progression of IBD and its relationships with genetic susceptibility and the mucosal immune response. In addition, potential therapeutic strategies for IBD that target oxidative stress signaling are reviewed and discussed. Though substantial progress has been made in understanding the role of oxidative stress in IBD in humans and experimental animals, the underlying mechanisms are still not well defined. Thus, further studies are needed to validate how oxidative stress signaling is involved in and contributes to the development of IBD.
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Affiliation(s)
- Tian Tian
- College of Life Science and Bioengineering, Beijing Jiaotong University, Beijing 100044, China
| | - Ziling Wang
- College of Life Science and Bioengineering, Beijing Jiaotong University, Beijing 100044, China
| | - Jinhua Zhang
- College of Life Science and Bioengineering, Beijing Jiaotong University, Beijing 100044, China
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Yildirim H, Sunay FB, Sinan S, Köçkar F. In vivo effects of curcumin on the paraoxonase, carbonic anhydrase, glucose-6-phosphate dehydrogenase and β-glucosidase enzyme activities in dextran sulphate sodium-induced ulcerative colitis mice. J Enzyme Inhib Med Chem 2016; 31:1583-90. [DOI: 10.3109/14756366.2016.1158173] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Hatice Yildirim
- Department of Molecular Biology and Genetics, Faculty of Science and Literature, Balikesir University, Balikesir, Turkey and
| | - Fatma Bahar Sunay
- Department of Histology & Embryology, Medical Faculty, Balikesir University, Balikesir, Turkey
| | - Selma Sinan
- Department of Molecular Biology and Genetics, Faculty of Science and Literature, Balikesir University, Balikesir, Turkey and
| | - Feray Köçkar
- Department of Molecular Biology and Genetics, Faculty of Science and Literature, Balikesir University, Balikesir, Turkey and
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He Y, Yue Y, Zheng X, Zhang K, Chen S, Du Z. Curcumin, inflammation, and chronic diseases: how are they linked? Molecules 2015; 20:9183-213. [PMID: 26007179 PMCID: PMC6272784 DOI: 10.3390/molecules20059183] [Citation(s) in RCA: 302] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Revised: 05/11/2015] [Accepted: 05/14/2015] [Indexed: 02/06/2023] Open
Abstract
It is extensively verified that continued oxidative stress and oxidative damage may lead to chronic inflammation, which in turn can mediate most chronic diseases including cancer, diabetes, cardiovascular, neurological, inflammatory bowel disease and pulmonary diseases. Curcumin, a yellow coloring agent extracted from turmeric, shows strong anti-oxidative and anti-inflammatory activities when used as a remedy for the prevention and treatment of chronic diseases. How oxidative stress activates inflammatory pathways leading to the progression of chronic diseases is the focus of this review. Thus, research to date suggests that chronic inflammation, oxidative stress, and most chronic diseases are closely linked, and the antioxidant properties of curcumin can play a key role in the prevention and treatment of chronic inflammation diseases.
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Affiliation(s)
- Yan He
- Institute of Natural Medicine & Green Chemistry, School of Chemical Engineering and Light Industry, Guandong University of Technology, 232 Wai Huan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
| | - Yuan Yue
- Institute of Natural Medicine & Green Chemistry, School of Chemical Engineering and Light Industry, Guandong University of Technology, 232 Wai Huan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
| | - Xi Zheng
- Institute of Natural Medicine & Green Chemistry, School of Chemical Engineering and Light Industry, Guandong University of Technology, 232 Wai Huan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
- Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
| | - Kun Zhang
- Institute of Natural Medicine & Green Chemistry, School of Chemical Engineering and Light Industry, Guandong University of Technology, 232 Wai Huan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
| | - Shaohua Chen
- Department of Otorhinolaryngology, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou 510030, China.
| | - Zhiyun Du
- Institute of Natural Medicine & Green Chemistry, School of Chemical Engineering and Light Industry, Guandong University of Technology, 232 Wai Huan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
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Chang JY, Chiang MF, Lin SR, Lee MH, He H, Chou PY, Chen SJ, Chen YA, Yang LY, Lai FJ, Hsieh CC, Hsieh TH, Sheu HM, Sze CI, Chang NS. TIAF1 self-aggregation in peritumor capsule formation, spontaneous activation of SMAD-responsive promoter in p53-deficient environment, and cell death. Cell Death Dis 2012; 3:e302. [PMID: 22534828 PMCID: PMC3358014 DOI: 10.1038/cddis.2012.36] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 02/10/2012] [Accepted: 02/14/2012] [Indexed: 12/22/2022]
Abstract
Self-aggregation of transforming growth factor β (TGF-β)1-induced antiapoptotic factor (TIAF1) is known in the nondemented human hippocampus, and the aggregating process may lead to generation of amyloid β (Aβ) for causing neurodegeneration. Here, we determined that overexpressed TIAF1 exhibits as aggregates together with Smad4 and Aβ in the cancer stroma and peritumor capsules of solid tumors. Also, TIAF1/Aβ aggregates are shown on the interface between brain neural cells and the metastatic cancer cell mass. TIAF1 is upregulated in developing tumors, but may disappear in established metastatic cancer cells. Growing neuroblastoma cells on the extracellular matrices from other cancer cell types induced production of aggregated TIAF1 and Aβ. In vitro induction of TIAF1 self-association upregulated the expression of tumor suppressors Smad4 and WW domain-containing oxidoreductase (WOX1 or WWOX), and WOX1 in turn increased the TIAF1 expression. TIAF1/Smad4 interaction further enhanced Aβ formation. TIAF1 is known to suppress SMAD-regulated promoter activation. Intriguingly, without p53, self-aggregating TIAF1 spontaneously activated the SMAD-regulated promoter. TIAF1 was essential for p53-, WOX1- and dominant-negative JNK1-induced cell death. TIAF1, p53 and WOX1 acted synergistically in suppressing anchorage-independent growth, blocking cell migration and causing apoptosis. Together, TIAF1 shows an aggregation-dependent control of tumor progression and metastasis, and regulation of cell death.
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Affiliation(s)
- J-Y Chang
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - M-F Chiang
- Department of Neurosurgery, Mackay Memorial Hospital, Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei, Taiwan, ROC
| | - S-R Lin
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - M-H Lee
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - H He
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - P-Y Chou
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - S-J Chen
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - Y-A Chen
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - L-Y Yang
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - F-J Lai
- Department of Dermatology, Chi-Mei Medical Center, Tainan, Taiwan, ROC
| | - C-C Hsieh
- Department of Dermatology, Chi-Mei Medical Center, Tainan, Taiwan, ROC
| | - T-H Hsieh
- Department of Anatomy and Cell Biology, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - H-M Sheu
- Department of Dermatology, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - C-I Sze
- Department of Anatomy and Cell Biology, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
| | - N-S Chang
- Institute of Molecular Medicine, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
- Department of Neurosurgery, Mackay Memorial Hospital, Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei, Taiwan, ROC
- Advanced Optoelectronic Technology Center, National Cheng Kung University College of Medicine, Tainan, Taiwan, ROC
- Center of Infectious Disease and Signal Research, National Cheng Kung University, Tainan, Taiwan, ROC
- Department of Neuroscience and Physiology, SUNY Upstate Medical University, Syracuse, NY, USA
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Hsu LJ, Schultz L, Mattison J, Lin YS, Chang NS. Cloning and characterization of a small-size peptide Zfra that regulates the cytotoxic function of tumor necrosis factor by interacting with JNK1. Biochem Biophys Res Commun 2005; 327:415-23. [PMID: 15629131 DOI: 10.1016/j.bbrc.2004.12.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2004] [Indexed: 11/19/2022]
Abstract
By cDNA library screening, here we isolated an unusual gene transcript encoding a 31-amino-acid zinc finger-like peptide that regulates apoptosis (named Zfra). Northern blotting and RT/PCR showed the transcript is abundant in spleen but absent in several prostate and breast cancer cells. When stably expressed in L929 fibroblasts, Zfra conferred resistance to the cytotoxic effects of TNF and FasL. In contrast, transiently expressed Zfra could enhance or inhibit the cytotoxicity of overexpressed death domain proteins TRADD, FADD, and RIP of the TNF signaling pathway. By GST pull-down assay and co-immunoprecipitation, TNF and UV light were shown to induce Zfra to rapidly self-associate and bind JNK1. While JNK1 is a downstream effector of the TNF signaling, Zfra regulation of the TNF cytotoxic function is likely due to its interaction, in part, with JNK1.
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Affiliation(s)
- Li-Jin Hsu
- Guthrie Research Institute, Laboratory of Molecular Immunology, 1 Guthrie Square, Sayre, PA 18840, USA
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Cao H, Pratt N, Mattison J, Zhao Y, Chang NS. Characterization of an apoptosis inhibitory domain at the C-termini of FE65-like protein. Biochem Biophys Res Commun 2000; 276:843-50. [PMID: 11027557 DOI: 10.1006/bbrc.2000.3527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
TR2(L) is a 56-amino-acid polypeptide that has been shown to block TNF cytotoxicity. FE65-like (FE65L) proteins possess this conserved TR2(L) sequence at their C-termini, whereas variations in the sequences are found in the FE65 proteins. To further analyze the antiapoptotic function of TR2(L), here we utilized an isolated murine partial FE65L cDNA that encodes an N-terminal phosphotyrosine-binding domain (PTB) and the conserved C-terminal TR2(L) sequence. When L929 cells were stably transfected with the FE65L cDNA or its 3' end TR2(L) DNA sequence, these cells became resistant to TNF killing. Replacement of the N-terminal PTB domain with GFP failed to abolish the FE65L-mediated TNF resistance. Ablation of the C-terminal TR2(L) sequence through frame-shift mutation resulted in a complete loss of the FE65L function against TNF. Various protein kinase inhibitors, including lavendustin A, tyrphostin, H7, and staurosporine, which may affect the PTB domain function, could not abolish the FE65L-mediated TNF resistance. A prolonged exposure of L929 cells to these inhibitors for 24 h resulted in cell death, whereas FE65L significantly blocked the cell death. Polyclonal antibodies were generated against a synthetic peptide and shown to interact with a 38-kDa FE65L in L929 cells. Hyaluronidase downregulates the expression of FE65L gene and protein in L929 cells, and this correlates with its enhancement of TNF killing of these cells. Together, our data indicate that the TR2(L) amino acid sequence is an apoptosis-inhibitory domain commonly present in the FE65 and FE65-like family proteins.
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Affiliation(s)
- H Cao
- Laboratory of Molecular Immunology, Guthrie Research Institute, Sayre, Pennsylvania, 18840, USA
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Takahashi MO, Takahashi Y, Iida K, Okimura Y, Kaji H, Abe H, Chihara K. Growth hormone stimulates tyrosine phosphorylation of focal adhesion kinase (p125(FAK)) and actin stress fiber formation in human osteoblast-like cells, Saos2. Biochem Biophys Res Commun 1999; 263:100-6. [PMID: 10486260 DOI: 10.1006/bbrc.1999.1314] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Bone is one of the essential target tissues of growth hormone (GH). In bone remodeling, cell-matrix attachment is important where focal adhesion kinase (FAK) is involved. FAK plays a central role in determining the shape and motility of cells in response to the extracellular matrix stimuli. In the present study, we have demonstrated that GH stimulated tyrosine phosphorylation of FAK in human osteoblast-like cells, Saos2. Moreover, GH rapidly enhanced the formation of actin stress fibers. In Saos2, Jak2 was tyrosine phosphorylated by GH stimulation, and AG490, a Jak2 specific inhibitor, inhibited GH-induced tyrosine phosphorylation of FAK and actin stress fiber reorganization. These results suggest that GH activates FAK via Jak2, and stimulates the formation of actin stress fibers in Saos2. Activation of FAK and actin stress fiber formation induced by GH seem to be important for the physiological role of osteoblast.
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Affiliation(s)
- M O Takahashi
- Third Division, Department of Medicine, Kobe University School of Medicine, Kobe, 650-0017, Japan
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