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Shao X, Shi Y, Wang Y, Zhang L, Bai P, Wang J, Aniwan A, Lin Y, Zhou S, Yu P. Single-Cell Sequencing Reveals the Expression of Immune-Related Genes in Macrophages of Diabetic Kidney Disease. Inflammation 2024; 47:227-243. [PMID: 37777674 DOI: 10.1007/s10753-023-01906-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/30/2023] [Accepted: 09/13/2023] [Indexed: 10/02/2023]
Abstract
Diabetic kidney disease (DKD) is characterized by macrophage infiltration, which requires further investigation. This study aims to identify immune-related genes (IRGs) in macrophage and explore their potential as therapeutic targets. This study analyzed isolated glomerular cells from three diabetic mice and three control mice. A total of 59 glomeruli from normal kidney samples and 66 from DKD samples were acquired from four kidney transcriptomic profiling datasets. Bioinformatics analysis was conducted using both single-cell RNA (scRNA) and bulk RNA sequencing data to investigate inflammatory responses in DKD. Additionally, the "AUCell" function was used to investigate statistically different gene sets. The significance of each interaction pair was determined by assigning a probability using "CellChat." The study also analyzed the biological diagnostic importance of immune hub genes for DKD and validated the expression of these immune genes in mice models. The top 2000 highly variable genes (HVGs) were identified after data normalization. Subsequently, a total of eight clusters were identified. It is worth mentioning that macrophages showed the highest percentage increase among all cell types in the DKD group. Furthermore, the present study observed significant differences in gene sets related to inflammatory responses and complement pathways. The study also identified several receptor-ligand pairs and co-stimulatory interactions between endothelial cells and macrophages. Notably, SYK, ITGB2, FCER1G, and VAV1 were identified as immunological markers of DKD with promising predictive ability. This study identified distinct cell clusters and four marker genes. SYK, ITGB2, FCER1G, and VAV1 may be important roles. Consequently, the present study extends our understanding regarding IRGs in DKD and provides a foundation for future investigations into the underlying mechanisms.
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Affiliation(s)
- Xian Shao
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Yueyue Shi
- Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300134, China
| | - Yao Wang
- Clinical Medical College & Affiliated Hospital of Chengdu University, Chengdu University, Chengdu, Sichuan, 610081, People's Republic of China
| | - Li Zhang
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Pufei Bai
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - JunMei Wang
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Ashanjiang Aniwan
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Yao Lin
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Saijun Zhou
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China
| | - Pei Yu
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, 300134, China.
- Tianjin Key Laboratory of Metabolic Diseases, Tianjin Medical University, Tianjin, 300134, China.
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Kobayashi A, Azuma K, Takeiwa T, Kitami T, Horie K, Ikeda K, Inoue S. A FRET-based respirasome assembly screen identifies spleen tyrosine kinase as a target to improve muscle mitochondrial respiration and exercise performance in mice. Nat Commun 2023; 14:312. [PMID: 36697396 PMCID: PMC9877034 DOI: 10.1038/s41467-023-35865-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 01/04/2023] [Indexed: 01/27/2023] Open
Abstract
Aerobic muscle activities predominantly depend on fuel energy supply by mitochondrial respiration, thus, mitochondrial activity enhancement may become a therapeutic intervention for muscle disturbances. The assembly of mitochondrial respiratory complexes into higher-order "supercomplex" structures has been proposed to be an efficient biological process for energy synthesis, although there is controversy in its physiological relevance. We here established Förster resonance energy transfer (FRET) phenomenon-based live imaging of mitochondrial respiratory complexes I and IV interactions using murine myoblastic cells, whose signals represent in vivo supercomplex assembly of complexes I, III, and IV, or respirasomes. The live FRET signals were well correlated with supercomplex assembly observed by blue native polyacrylamide gel electrophoresis (BN-PAGE) and oxygen consumption rates. FRET-based live cell screen defined that the inhibition of spleen tyrosine kinase (SYK), a non-receptor protein tyrosine kinase that belongs to the SYK/ zeta-chain-associated protein kinase 70 (ZAP-70) family, leads to an increase in supercomplex assembly in murine myoblastic cells. In parallel, SYK inhibition enhanced mitochondrial respiration in the cells. Notably, SYK inhibitor administration enhances exercise performance in mice. Overall, this study proves the feasibility of FRET-based respirasome assembly assay, which recapitulates in vivo mitochondrial respiration activities.
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Affiliation(s)
- Ami Kobayashi
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan.,Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Kotaro Azuma
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan
| | - Toshihiko Takeiwa
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan
| | - Toshimori Kitami
- Laboratory for Metabolic Networks, RIKEN Center for Integrative Medical Sciences, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan
| | - Kuniko Horie
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, 1397-1 Yamane, Hidaka-shi, Saitama, 350-1241, Japan
| | - Kazuhiro Ikeda
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, 1397-1 Yamane, Hidaka-shi, Saitama, 350-1241, Japan
| | - Satoshi Inoue
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan. .,Division of Systems Medicine and Gene Therapy, Saitama Medical University, 1397-1 Yamane, Hidaka-shi, Saitama, 350-1241, Japan.
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3
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Su X, Sun ZH, Ren Q, Liu JR, Yin L, Liang N, Meng L, Sun RX. The effect of spleen tyrosine kinase inhibitor R406 on diabetic retinopathy in experimental diabetic rats. Int Ophthalmol 2020; 40:2371-2383. [PMID: 32462561 DOI: 10.1007/s10792-020-01422-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 05/11/2020] [Indexed: 12/11/2022]
Abstract
PURPOSE To investigate the effect of spleen tyrosine kinase (Syk) inhibitor R406 on diabetic retinopathy (DR) in diabetic mellitus (DM) rats. METHODS Rats were randomized into Normal, DM, DM + 5 mg/kg R406 and DM + 10 mg/kg R406 groups. DM rats were established via injection of streptozotocin (STZ). One week after model establishment, rats in treatment groups received 5 mg/kg or 10 mg/kg R406 by gavage administration for 12 weeks consecutively, followed by the detection with hematoxylin-eosin (HE) staining, Evans blue angiography, retinal trypsin digestion assay, Western blotting, immunohistochemistry, TUNEL assay, immunofluorescence assay and quantitative reverse transcriptase real-time polymerase chain reaction (qRT-PCR). RESULTS The retina of DM rats presented different degree of edema, disordered and loose structure, swollen cells with enlarged intercellular space, and dilated and congested capillaries. Besides, the retinal vessels of DM rats showed high fluorescence leakage. However, R406 alleviated the above-mentioned conditions, which was much better with high concentration of R406 (10 mg/kg). R406 also reversed the down-regulations of occludin, claudin-5, ZO-1 and the up-regulation of and VEGF in retinal tissues of DM rats; inhibited retinal cell apoptosis; strengthened retinal cell proliferation; and reduced expressions of IL-1β, IL-6, TNF-α and nuclear p65 NF-κB in retinal tissues. The improvement in all these indexes was much more significant in rats of DM + 10 mg/kg R406 group than in rats of DM + 5 mg/kg R406 group. CONCLUSION Syk inhibitor R406 could attenuate retinal inflammation in DR rats via the repression of NF-κB activation.
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Affiliation(s)
- Xian Su
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Zhao-Hui Sun
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Qian Ren
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Jun-Ru Liu
- Department of Ophthalmology, The Third Hospital of Shijiazhuang City, Shijiazhuang, 050011, Hebei Province, China
| | - Li Yin
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Na Liang
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Ling Meng
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China
| | - Rui-Xue Sun
- Department of Ophthalmology, The First Hospital of Shijiazhuang City, No. 12, Pingan North Street, Shijiazhuang, 050000, Hebei Province, China.
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Zhang J, Yan J. Protective Effect of Ginkgolic Acid in Attenuating LDL Induced Inflammation Human Peripheral Blood Mononuclear Cells via Altering the NF-κB Signaling Pathway. Front Pharmacol 2019; 10:1241. [PMID: 31780924 PMCID: PMC6856219 DOI: 10.3389/fphar.2019.01241] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 09/27/2019] [Indexed: 12/12/2022] Open
Abstract
Oxidized low-density lipoprotein (ox-LDL) is considered as the significant maker of inflammatory reaction. ox-LDL was reported to play a crucial role in the pathogenesis of atherosclerosis (AS). In the current study, we scrutinize the suppressive effect of ginkgolic acid against ox-LDL induced an oxidative and inflammatory response in human microvascular endothelial cells (HMEC-1) and human peripheral blood mononuclear cells (nPBMCs) and explore the mechanism of action. HMEC-1 cells are treated with ox-LDL in the presence of different concentration of ginkgolic acid. MTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was performed for the estimation of cell viability effect. Reactive oxygen species (ROS), inflammatory cytokines, and NF-κB activity are also estimated. For the hPBMCs assay, the cells were isolated from the healthy volunteers and cultured. The cells were further divided into different group and received the ginkgolic acid. Additionally, ROS, inflammatory marker such as prostaglandin E2 (PGE2), lipoxygenase (LOX), nitric oxide (NO), cyclooxygenase (COX) protein expression, and mRNA expression of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and vascular cell adhesion protein 1 (VCAM-1) were estimated in the ox-LDL treated group. The result exhibited that ginkgolic acid treatment induced the cell viability boosting in ox-LDL treatment and intracellular ROS significantly decreased by ginkgolic acid. Pro-inflammatory cytokines also downregulated via ginkgolic acid. Moreover, ginkgolic acid reduced the ox-LDL-induced NF-κB. The mRNA and protein expression of TNF-α, IL-6, and VCAM-1 considerably increased in the ox-LDL treated group and ginkgolic acid significantly reduced the mRNA and protein expression. An inflammatory marker such as PGE2, LOX, and NO were increased in the ox-LDL treated group and ginkgolic acid treated group exhibited the reduction of an inflammatory marker. Based on the result, we can conclude that ginkgolic acid significantly reduced and reversed the ox-LDL-induced modulation, suggesting its anti-inflammatory effect via the NF-κB pathway.
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Affiliation(s)
- Juan Zhang
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jifeng Yan
- Heart Center of Henan Provincial People’s Hospital, Central China Fuwai Hospital, Zhengzhou, China
- Central China Fuwai Hospital of ZhengZhou University, ZhengZhou, China
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5
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Wang X, Liu R, Qu X, Yu H, Chu H, Zhang Y, Zhu W, Wu X, Gao H, Tao B, Li W, Liang J, Li G, Yang W. α-Ketoglutarate-Activated NF-κB Signaling Promotes Compensatory Glucose Uptake and Brain Tumor Development. Mol Cell 2019; 76:148-162.e7. [PMID: 31447391 DOI: 10.1016/j.molcel.2019.07.007] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/25/2019] [Accepted: 07/08/2019] [Indexed: 12/12/2022]
Abstract
The rapid proliferation of cancer cells and dysregulated vasculature within the tumor leads to limited nutrient accessibility. Cancer cells often rewire their metabolic pathways for adaption to nutrient stress, and the underlying mechanism remains largely unknown. Glutamate dehydrogenase 1 (GDH1) is a key enzyme in glutaminolysis that converts glutamate to α-ketoglutarate (α-KG). Here, we show that, under low glucose, GDH1 is phosphorylated at serine (S) 384 and interacts with RelA and IKKβ. GDH1-produced α-KG directly binds to and activates IKKβ and nuclear factor κB (NF-κB) signaling, which promotes glucose uptake and tumor cell survival by upregulating GLUT1, thereby accelerating gliomagenesis. In addition, GDH1 S384 phosphorylation correlates with the malignancy and prognosis of human glioblastoma. Our finding reveals a unique role of α-KG to directly regulate signal pathway, uncovers a distinct mechanism of metabolite-mediated NF-κB activation, and also establishes the critical role of α-KG-activated NF-κB in brain tumor development.
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Affiliation(s)
- Xiongjun Wang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Precise Genome Engineering Center, School of Life Sciences, Guangzhou University, Guangzhou 510006, China
| | - Ruilong Liu
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiujuan Qu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang 110001, China
| | - Hua Yu
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Huiying Chu
- Laboratory of Molecular Modeling, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yajuan Zhang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Wencheng Zhu
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Xueyuan Wu
- Department of Radiation Oncology, First Affiliated Hospital of Wenzhou Medical College, Wenzhou, Zhejiang 325000, China
| | - Hong Gao
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Bangbao Tao
- Department of Neurosurgery, XinHua Hospital School of Medicine, Shanghai Jiaotong University, Shanghai 200092, China
| | - Wenfeng Li
- Department of Radiation Oncology, First Affiliated Hospital of Wenzhou Medical College, Wenzhou, Zhejiang 325000, China
| | - Ji Liang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Guohui Li
- Laboratory of Molecular Modeling, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Weiwei Yang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Key Laboratory of Molecular Andrology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China.
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Dubey NK, Wei HJ, Yu SH, Williams DF, Wang JR, Deng YH, Tsai FC, Wang PD, Deng WP. Adipose-derived Stem Cells Attenuates Diabetic Osteoarthritis via Inhibition of Glycation-mediated Inflammatory Cascade. Aging Dis 2019; 10:483-496. [PMID: 31164994 PMCID: PMC6538220 DOI: 10.14336/ad.2018.0616] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 06/16/2018] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus (DM) is well-known to exert complications such as retinopathy, cardiomyopathy and neuropathy. However, in recent years, an elevated osteoarthritis (OA) complaints among diabetics have been observed, portending the risk of diabetic OA. Since formation of advanced glycation end products (AGE) is believed to be the etiology of various diseases under hyperglycemic conditions, we firstly established that streptozotocin-induced DM could potentiate the development of OA in C57BL/6J mouse model, and further explored the intra-articularly administered adipose-derived stem cell (ADSC) therapy focusing on underlying AGE-associated mechanism. Our results demonstrated that hyperglycemic mice exhibited OA-like structural impairments including a proteoglycan loss and articular cartilage fibrillations in knee joint. Highly expressed levels of carboxymethyl lysine (CML), an AGE and their receptors (RAGE), which are hallmarks of hyperglycemic microenvironment were manifested. The elevated oxidative stress in diabetic OA knee-joint was revealed through increased levels of malondialdehyde (MDA). Further, oxidative stress-activated nuclear factor kappa B (NF-κB), the marker of proinflammatory signalling pathway was also accrued; and levels of matrix metalloproteinase-1 and 13 were upregulated. However, ADSC treatment attenuated all OA-like changes by 4 weeks, and dampened levels of CML, RAGE, MDA, NF-κB, MMP-1 and 13. These results suggest that during repair and regeneration, ADSCs inhibited glycation-mediated inflammatory cascade and rejuvenated cartilaginous tissue, thereby promoting knee-joint integrity in diabetic milieu.
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Affiliation(s)
- Navneet Kumar Dubey
- 1Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan.,2Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Hong-Jian Wei
- 2Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,3School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,4School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Sung-Hsun Yu
- 2Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - David F Williams
- 5Wake Forest Institute of Regenerative Medicine, Winston-Salem, NC, USA
| | - Joseph R Wang
- 6Department of Periodontics, College of Dental Medicine, Columbia University, New York, USA
| | - Yue-Hua Deng
- 7Department of Life Science, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Feng-Chou Tsai
- 8Stem Cell Research Center, Cosmetic Clinic Group, Taipei, Taiwan
| | - Peter D Wang
- 4School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,9Department of Dentistry, Taipei Medical University Hospital, Taipei, Taiwan
| | - Win-Ping Deng
- 2Stem Cell Research Center, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,4School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.,10Graduate Institute of Basic Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
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7
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Panahi G, Pasalar P, Zare M, Rizzuto R, Meshkani R. High glucose induces inflammatory responses in HepG2 cells via the oxidative stress-mediated activation of NF-κB, and MAPK pathways in HepG2 cells. Arch Physiol Biochem 2018; 124:468-474. [PMID: 29364751 DOI: 10.1080/13813455.2018.1427764] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECTIVE The aim of this study was to investigate the effects of high glucose (HG) on inflammation in HepG2 cells. METHODS The molecular mechanisms linking HG to inflammation was assessed in HepG2 cells exposed to HG (33 mM). RESULTS The results showed that HG significantly enhanced TNF-α, IL-6 and PAI-1 expression in HepG2 cells. Increased expression of cytokines was accompanied by enhanced phosphorylation of JNK, P38, ERK and IKKα/IKKβ. In addition, JNK, ERK, P38 and NF-kB inhibitors could significantly attenuate HG-induced expression of TNF-α, IL-6 and PAI-1. Furthermore, HG could promote the generation of reactive oxygen species (ROS), while N-acetyl cysteine, a ROS scavenger, had an inhibitory effect on the expression of TNF-α, IL-6 and PAI-1 in HG-treated cells. CONCLUSIONS Our results indicated that HG-induced inflammation is mediated through the generation of ROS and activation of the MAPKs and NF-kB signalling pathways in HepG2 cells.
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Affiliation(s)
- Ghodratollah Panahi
- a Department of Biochemistry, Faculty of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Parvin Pasalar
- a Department of Biochemistry, Faculty of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Mina Zare
- b Recombinant Protein Laboratory, Department of Biochemistry , Shiraz University of Medical Sciences , Shiraz , Iran
| | - Rosario Rizzuto
- c Department of Biomedical Sciences , University of Padova , Padua , Italy
| | - Reza Meshkani
- a Department of Biochemistry, Faculty of Medicine , Tehran University of Medical Sciences , Tehran , Iran
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8
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Lee KTD, Chiang MH, Chen PH, Ho ML, Lee HZ, Lee HE, Wang YH. The effect of low-level laser irradiation on hyperglycemia-induced inflammation in human gingival fibroblasts. Lasers Med Sci 2018; 34:913-920. [DOI: 10.1007/s10103-018-2675-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 10/25/2018] [Indexed: 01/09/2023]
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9
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Levistilide A Ameliorates NLRP3 Expression Involving the Syk-p38/JNK Pathway and Peripheral Obliterans in Rats. Mediators Inflamm 2018; 2018:7304096. [PMID: 30158835 PMCID: PMC6109531 DOI: 10.1155/2018/7304096] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 06/23/2018] [Accepted: 07/19/2018] [Indexed: 12/20/2022] Open
Abstract
Background Inflammation is one of the most important pathogeneses of thromboangiitis obliterans (TAO). The NLRP3 inflammasome plays a vital role in the body's immune response and disease development. It can be activated by numerous types of pathogens or danger signals. As the core of the inflammatory response, the NLRP3 inflammasome may provide a new target for the treatment of various inflammatory diseases. Levistilide A (LA) is a phthalide dimer isolated from umbelliferous plants. Its pharmacological effect is largely unknown. This study revealed the effects of LA on endothelial cell activation, NLRP3, IL-1β, TNF-α, IL-32, and CCL-2, VCAM-1, MCP-1, and the spleen tyrosine kinase (Syk)--p38/JNK signaling axis and its effect on vasculitis in rats. Results LA inhibited endothelial activation and the expression of IL-1β, TNF-α, IL-32, CCL-2, VCAM-1, and MCP-1. LA directly obstructed Syk phosphorylation and activity in a dose-dependent manner, inhibited the activity of p38 and JNK, and reduced the expression of NLRP3 in human umbilical vein endothelial cells and vascular tissue of rats with vasculitis. Conclusion LA suppressed NLRP3 gene expression by blocking the Syk--p38/JNK pathway and reduced damage to the rats' limbs in the thromboangiitis obliterans model.
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10
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Qiao Y, Tian X, Men L, Li S, Chen Y, Xue M, Hu Y, Zhou P, Long G, Shi Y, Liu R, Liu Y, Qi Z, Cui Y, Shen Y. Spleen tyrosine kinase promotes NLR family pyrin domain containing 3 inflammasome‑mediated IL‑1β secretion via c‑Jun N‑terminal kinase activation and cell apoptosis during diabetic nephropathy. Mol Med Rep 2018; 18:1995-2008. [PMID: 29901140 PMCID: PMC6072182 DOI: 10.3892/mmr.2018.9164] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 05/18/2018] [Indexed: 12/31/2022] Open
Abstract
Diabetic nephropathy (DN) is a serious complication of diabetes and can cause an increased mortality risk. It was previously reported that NLR family pyrin domain containing 3 (NLRP3) inflammasome is involved in the pathogenesis of diabetes. However, the underlying mechanism is not clearly understood. In the present study, the effects of spleen tyrosine kinase (Syk) and c-Jun N-terminal kinase (JNK) on the NLRP3 inflammasome were examined in vivo and in vitro. Sprague-Dawley rats were injected intraperitoneally with streptozotocin (65 mg/kg) to induce diabetes. HK2 cells and rat glomerular mesangial cells (RGMCs) were examined to detect the expression of JNK and NLRP3 inflammasome-associated proteins following treatment with a Syk inhibitor or Syk-small interfering (si)RNA in a high glucose condition. In the present study, it was revealed that the protein and mRNA expression levels of NLRP3 inflammasome-associated molecules and the downstream mature interleukin (IL)-1β were upregulated in vivo and in vitro. The Syk inhibitor and Syk-siRNA suppressed high glucose-induced JNK activation, and subsequently downregulated the activation of the NLRP3 inflammasome and mature IL-1β in HK2 cells and RGMCs. Furthermore, high glucose-induced apoptosis of HK2 cells was reduced by the Syk inhibitor BAY61-3606. Therefore, the present results determined that high glucose-induced activation of the NLRP3 inflammasome is mediated by Syk/JNK activation, which subsequently increased the protein expression level of IL-1β and mature IL-1β. The present study identified that the Syk/JNK/NLRP3 signaling pathway may serve a vital role in the pathogenesis of DN.
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Affiliation(s)
- Yingchun Qiao
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Xixi Tian
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Li Men
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Shengyu Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Yufeng Chen
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Meiting Xue
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Yahui Hu
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Pengfei Zhou
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Guangfeng Long
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Yue Shi
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Ruiqing Liu
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Yunde Liu
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Zhi Qi
- Department of Histology and Embryology, School of Medicine, Nankai University, Tianjin 300071, P.R. China
| | - Yujie Cui
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Yanna Shen
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
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Bonilla-Ramírez L, Jiménez-Del-Río M, Vélez-Pardo C. Glucose promotes resistance in lymphocytes against oxidative stress-induced apoptosis through signaling and metabolic pathways. Implications for Parkinson’s disease. IATREIA 2017. [DOI: 10.17533/udea.iatreia.v30n2a02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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12
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Ma TKW, McAdoo SP, Tam FWK. Spleen Tyrosine Kinase: A Crucial Player and Potential Therapeutic Target in Renal Disease. Nephron Clin Pract 2016; 133:261-9. [PMID: 27476075 DOI: 10.1159/000446879] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 04/24/2016] [Indexed: 02/06/2023] Open
Abstract
Spleen tyrosine kinase (Syk), a 72 kDa cytoplasmic non-receptor protein-tyrosine kinase, plays an important role in signal transduction in a variety of cell types. Ever since its discovery in the early 1990s, there has been accumulating evidence to suggest a pathogenic role of Syk in various allergic disorders, autoimmune diseases and malignancies. Additionally, there is emerging data from both pre-clinical and clinical studies that Syk is implicated in the pathogenesis of proliferative glomerulonephritis (GN), including anti-glomerular basement membrane disease, anti-neutrophil cytoplasmic antibody-associated GN, lupus nephritis and immunoglobulin A nephropathy (IgAN). Moreover, recent animal studies have shed light on the importance of Syk in mediating acute renal allograft rejection, Epstein Barr virus-associated post-transplant lymphoproliferative disease and kidney fibrosis. Fostamatinib, an oral Syk inhibitor, has undergone clinical testing in rheumatoid arthritis, refractory immune thrombocytopenic purpura, leukemia and lymphoma. The recent STOP-IgAN trial showed that the addition of non-selective immunosuppressive therapy to intensive supportive care did not improve clinical outcomes in high-risk IgAN patients. A Syk-targeted approach may be beneficial and is currently being evaluated in a phase II randomized controlled trial. In this review, we will discuss the pathogenic role of Syk and potential use of Syk inhibitor in a variety of renal diseases.
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Affiliation(s)
- Terry King-Wing Ma
- Renal and Vascular Inflammation Section, Department of Medicine, Imperial College London, Hammersmith Hospital, London, UK
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13
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Tang ST, Zhang Q, Tang HQ, Wang CJ, Su H, Zhou Q, Wei W, Zhu HQ, Wang Y. Effects of glucagon-like peptide-1 on advanced glycation endproduct-induced aortic endothelial dysfunction in streptozotocin-induced diabetic rats: possible roles of Rho kinase- and AMP kinase-mediated nuclear factor κB signaling pathways. Endocrine 2016; 53:107-16. [PMID: 26758998 DOI: 10.1007/s12020-015-0852-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Accepted: 12/28/2015] [Indexed: 01/12/2023]
Abstract
Interaction between advanced glycation endproducts (AGEs) and receptor for AGEs (RAGE) as well as downstream pathways leads to vascular endothelial dysfunction in diabetes. Glucagon-like peptide-1 (GLP-1) has been reported to attenuate endothelial dysfunction in the models of atherosclerosis. However, whether GLP-1 exerts protective effects on aortic endothelium in diabetic animal model and the underlying mechanisms are still not well defined. Experimental diabetes was induced through administration with combination of high-fat diet and intraperitoneal injection of streptozotocin. Rats were randomly divided into four groups, including controls, diabetes, diabetes + sitagliptin (30 mg/kg/day), diabetes + exenatide (3 μg/kg/12 h). Eventually, endothelial damage, markers of inflammation and oxidative stress, were measured. After 12 weeks administration, diabetic rats received sitagliptin and exenatide showed significant elevation of serum NO level and reduction of ET-1 as well as inflammatory cytokines levels. Moreover, sitagliptin and exenatide significantly inhibited aortic oxidative stress level and improved aortic endothelial function in diabetic rats. Importantly, these drugs inhibited the protein expression level in AGE/RAGE-induced RhoA/ROCK/NF-κB/IκBα signaling pathways and activated AMPK in diabetic aorta. Finally, the target proteins of p-eNOS, iNOS, and ET-1, which reflect endothelial function, were also changed by these drugs. Our present study indicates that sitagliptin and exenatide administrations can improve endothelial function in diabetic aorta. Of note, RAGE/RhoA/ROCK and AMPK mediated NF-κB signaling pathways may be the intervention targets of these drugs to protect aortic endothelium.
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Affiliation(s)
- Song-Tao Tang
- Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China
- Laboratory of Molecular Biology, Department of Biochemistry, Anhui Medical University, 81 Meishan Road, Hefei, Zip code: 230032, Anhui Province, China
- Department of Endocrinology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Qiu Zhang
- Department of Endocrinology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Hai-Qin Tang
- Department of Geriatrics, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Chang-Jiang Wang
- Department of Endocrinology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Huan Su
- Laboratory of Molecular Biology, Department of Biochemistry, Anhui Medical University, 81 Meishan Road, Hefei, Zip code: 230032, Anhui Province, China
| | - Qing Zhou
- Laboratory of Molecular Biology, Department of Biochemistry, Anhui Medical University, 81 Meishan Road, Hefei, Zip code: 230032, Anhui Province, China
| | - Wei Wei
- Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China
| | - Hua-Qing Zhu
- Laboratory of Molecular Biology, Department of Biochemistry, Anhui Medical University, 81 Meishan Road, Hefei, Zip code: 230032, Anhui Province, China.
| | - Yuan Wang
- Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China.
- Laboratory of Molecular Biology, Department of Biochemistry, Anhui Medical University, 81 Meishan Road, Hefei, Zip code: 230032, Anhui Province, China.
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Garufi A, Trisciuoglio D, Cirone M, D'Orazi G. ZnCl2 sustains the adriamycin-induced cell death inhibited by high glucose. Cell Death Dis 2016; 7:e2280. [PMID: 27362798 PMCID: PMC5108333 DOI: 10.1038/cddis.2016.178] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 05/14/2016] [Accepted: 05/30/2016] [Indexed: 12/15/2022]
Abstract
Hyperglycemia, the condition of high blood glucose, is typical of diabetes and obesity and represents a significant clinical problem. The relationship between hyperglycemia and cancer risk has been established by several studies. Moreover, hyperglycemia has been shown to reduce cancer cell response to therapies, conferring resistance to drug-induced cell death. Therefore, counteracting the negative effects of hyperglycemia may positively improve the cancer cell death induced by chemotherapies. Recent studies showed that zinc supplementation may have beneficial effects on glycemic control. Here we aimed at evaluating whether ZnCl2 could counteract the high-glucose (HG) effects and consequently restore the drug-induced cancer cell death. At the molecular level we found that the HG-induced expression of genes known to be involved in chemoresistance (such as HIF-1α, GLUT1, and HK2 glycolytic genes, as well as NF-κB activity) was reduced by ZnCl2 treatment. In agreement, the adryamicin (ADR)-induced apoptotic cancer cell death was significantly impaired by HG and efficiently re-established by ZnCl2 cotreatment. Mechanistically, the ADR-induced c-Jun N-terminal kinase/stress-activated protein kinase (JNK/SAPK) phosphorylation, inhibited by HG, was efficiently restored by ZnCl2. The JNK involvement in apoptotic cell death was assessed by the use of JNK dominant-negative expression vector that indeed impaired the ZnCl2 ability to restore drug-induced cell death in HG condition. Altogether, these findings indicate that ZnCl2 supplementation efficiently restored the drug-induced cancer cell death, inhibited by HG, by both sustaining JNK activation and counteracting the glycolytic pathway.
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Affiliation(s)
- A Garufi
- Department of Research, Advanced Diagnostics, and Technological Innovation, Regina Elena National Cancer Institute, Rome, Italy.,Department of Medical, Oral and Biotechnological Sciences, Tumor Biology Section, University 'G. d'Annunzio', Chieti, Italy
| | - D Trisciuoglio
- Department of Research, Advanced Diagnostics, and Technological Innovation, Regina Elena National Cancer Institute, Rome, Italy
| | - M Cirone
- Department of Experimental Medicine, Pasteur-Fondazione Cenci Bolognetti Institute, Sapienza University, Rome, Italy
| | - G D'Orazi
- Department of Research, Advanced Diagnostics, and Technological Innovation, Regina Elena National Cancer Institute, Rome, Italy.,Department of Medical, Oral and Biotechnological Sciences, Tumor Biology Section, University 'G. d'Annunzio', Chieti, Italy
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15
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De Melo EN, Deda L, Har R, Reich HN, Scholey JW, Daneman D, Moineddin R, Motran L, Elia Y, Cherney DZI, Sochett EB, Mahmud FH. The urinary inflammatory profile in gluten free diet-adherent adolescents with type 1 diabetes and celiac disease. J Diabetes Complications 2016; 30:295-9. [PMID: 26790575 DOI: 10.1016/j.jdiacomp.2015.11.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 10/28/2015] [Accepted: 11/23/2015] [Indexed: 11/26/2022]
Abstract
AIMS Our objective was to characterize urinary cytokine/chemokine excretion in adolescents with type 1 diabetes (T1D) and celiac disease (CD) adhering to gluten free diet (GFD) compared to matched T1D patients and healthy control (HC) group from an existing cohort. METHODS Eighteen T1D+CD+GFD patients aged 10-16years were identified and matched 2:1 for age, sex, diabetes duration and glycated hemoglobin to 36 T1D subjects and 36 HC. T1D+CD+GFD patients were adherent with a GFD. Urine and serum levels of cytokines/chemokines as well as baseline clinical and laboratory variables were assessed. RESULTS T1D+CD+GFD patients exhibited lower levels of urinary IL-1B, IL-4, IL-5 (p<0.05) and IFN-γ, IL-8 and G-CSF levels (p<0.07) compared with T1D patients. Urinary biomarker levels between T1D+CD+GFD and HC were mostly similar. In contrast, urinary FGF-2, Flt-3, IL-1B, IL-1RA, IL-4, IL-5, IL-9, IL-10, IL-12p40, IL-15, MIP-1β, and TNF-β (p<0.05) were higher in T1D patients compared to HC. Similar levels of inflammatory markers were seen in the serum for all 3 groups. CONCLUSIONS T1D+CD+GFD patients demonstrated decreased urinary inflammatory cytokine/chemokines compared to T1D and some similar to HC, which is suggestive of a potential modulatory role of treated CD on urinary markers.
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Affiliation(s)
- Emilia N De Melo
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - Livia Deda
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - Ronnie Har
- Division of Nephrology, Toronto General Hospital, University of Health Network, University of Toronto, 585 University Avenue, Toronto, ON, Canada
| | - Heather N Reich
- Division of Nephrology, Toronto General Hospital, University of Health Network, University of Toronto, 585 University Avenue, Toronto, ON, Canada
| | - James W Scholey
- Division of Nephrology, Toronto General Hospital, University of Health Network, University of Toronto, 585 University Avenue, Toronto, ON, Canada
| | - Denis Daneman
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - Rahim Moineddin
- Department of Family and Community Medicine, University of Toronto, 500 University Avenue, Toronto, ON, Canada
| | - Laura Motran
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - Yesmino Elia
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - David Z I Cherney
- Division of Nephrology, Toronto General Hospital, University of Health Network, University of Toronto, 585 University Avenue, Toronto, ON, Canada
| | - Etienne B Sochett
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada
| | - Farid H Mahmud
- Department of Pediatrics, Division of Endocrinology, Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, ON, Canada.
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16
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Zhou B, Feng B, Qin Z, Zhao Y, Chen Y, Shi Z, Gong Y, Zhang J, Yuan F, Mu J. Activation of farnesoid X receptor downregulates visfatin and attenuates diabetic nephropathy. Mol Cell Endocrinol 2016; 419:72-82. [PMID: 26450152 DOI: 10.1016/j.mce.2015.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 09/29/2015] [Accepted: 10/01/2015] [Indexed: 02/07/2023]
Abstract
Visfatin, a recently discovered adipocytokine, has been shown to have an important role in the pathogenesis of diabetic nephropathy (DN). The farnesoid X receptor (FXR), a ligand-activated nuclear receptor, plays a protective role in DN. The regulation between FXR and visfatin and their interaction in DN has not been well established. In this study, we reported that FXR agonist GW4064 reduced high glucose induced human mesangial cells (HMCs) inflammation, fibrosis and proliferation by downregulating visfatin expression, which can be blunted by exogenous visfatin treatment. Moreover, luciferase reporter assay showed FXR regulated visfatin transcription activity probably by binding to the -1607 bp and -1192 bp region of the visfatin promoter. In vivo study also showed that GW4064 ameliorated the progression of DN in db/db mice with a decreased visfatin expression. These findings suggest that FXR activation delayed the progression of diabetic nephropathy and this effect is through downregulating visfatin.
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Affiliation(s)
- Baoshang Zhou
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Bing Feng
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Zhexue Qin
- Department of Cardiology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Youguang Zhao
- Department of Urology, Chengdu Military General Hospital, Chengdu 610083, China
| | - Yu Chen
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Zhengmin Shi
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Yi Gong
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Jing Zhang
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Fahuan Yuan
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
| | - Jiao Mu
- Department of Nephrology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
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Vandenbriele C, Sun Y, Criel M, Cludts K, Van kerckhoven S, Izzi B, Vanassche T, Verhamme P, Hoylaerts MF. Dextran sulfate triggers platelet aggregation via direct activation of PEAR1. Platelets 2015; 27:365-72. [DOI: 10.3109/09537104.2015.1111321] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Christophe Vandenbriele
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Yi Sun
- Cell Surface Signalling Laboratory, Wellcome Trust Sanger Institute, Cambridge CB10 1HH, UK
| | - Maarten Criel
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Katrien Cludts
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Soetkin Van kerckhoven
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Benedetta Izzi
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Thomas Vanassche
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Peter Verhamme
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Marc F. Hoylaerts
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
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18
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The RCAN1 inhibits NF-κB and suppresses lymphoma growth in mice. Cell Death Dis 2015; 6:e1929. [PMID: 26492364 PMCID: PMC4632290 DOI: 10.1038/cddis.2015.260] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 07/21/2015] [Accepted: 08/12/2015] [Indexed: 11/28/2022]
Abstract
Nuclear factor-κB (NF-κB) has a vital role in cell survival. Inhibition of NF-κB has been proven to be an efficient therapeutic pathway for various cancers. Activation of NF-κB is mainly through serine residues' phosphorylation of inhibitor of κBα (IκBα) by IKK complex. Phosphorylation at tyrosine 42 is an alternative pathway in regulation of IκBα and NF-κB signaling, though little is known about the underlying mechanism. Here we identified regulator of calcineurin 1 (RCAN1) as a novel endogenous inhibitor of NF-κB signaling pathway. RCAN1 can interact with IκBα and affect the phosphorylation of IκBα at tyrosine 42. Overexpression of RCAN1 by adenovirus reduced cell viability in lymphoma Raji cells and restrained the growth of lymphoma transplants in mice. We further found that N terminus 1–103aa of RCAN1 is sufficient to inhibit NF-κB and reduce cell viability of lymphoma cells. Our study implicated a novel therapeutic approach for lymphoma by RCAN1 through inhibition of NF-κB signaling.
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19
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Glucagon-like peptide-1 receptor agonist liraglutide inhibits endothelin-1 in endothelial cell by repressing nuclear factor-kappa B activation. Cardiovasc Drugs Ther 2014; 27:371-80. [PMID: 23657563 DOI: 10.1007/s10557-013-6463-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
PURPOSE The increase in endothelin-1 (ET-1) and the decrease in endothelial nitric oxide synthase (eNOS) both induce vasoconstriction and lead to molecular changes associated with diabetes mellitus and atherosclerosis. Glucagon-like peptide-1 (GLP-1) activation stimulates insulin secretion and may prevent atherosclerosis by increasing eNOS synthesis. However, there is paucity of information on the effect of GLP-1 activation on ET-1 expression. This study was conducted to address this issue. METHODS AND RESULTS Human umbilical vein endothelial cells (HUVECs) were incubated with different concentrations of liraglutide, a GLP-1 agonist, and the expression of ET-1 and eNOS and activity of NF-κB were measured. Liraglutide, in a concentration-dependent manner, was observed to promote eNOS expression and to inhibit ET-1 expression both at mRNA and protein levels. Liraglutide also inhibited NF-κB phosphorylation and its translocation from cytoplasm to the nucleus. To ascertain the role of NF-κB activation in the altered expression of ET-1 and eNOS, we treated HUVECs with phorbol 12-myristate 13-acetate (PMA). PMA activated NF-κB and reversed the effects of liraglutide on eNOS and ET-1 expression. The effects of PMA on eNOS and ET-1 expression were reproduced in experiments wherein cells were treated with TNF-α. Further, we measured the generation of IL-6, apowerful pro-inflammatory molecule released by endothelial cells, as a measure of cellular function. PMA increased IL-6 generation, and this effect was blocked by liraglutide. CONCLUSIONS Our observations suggest liraglutide suppresses ET-1 expression by inhibiting the phosphorylation of NF-κB. This mechanism may underlie the potential anti-atherosclerotic effects of GLP-1 agonists. Of note, these effects of liraglutide were seen in an in vitro setting wherein cellular glucose concentrations were elevated.
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SUN LI, LI WEIPING, LI WEIZU, XIONG LI, LI GUIPING, MA RONG. Astragaloside IV prevents damage to human mesangial cells through the inhibition of the NADPH oxidase/ROS/Akt/NF-κB pathway under high glucose conditions. Int J Mol Med 2014; 34:167-76. [DOI: 10.3892/ijmm.2014.1741] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 04/01/2014] [Indexed: 11/06/2022] Open
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Abstract
At least 468 individual genes have been manipulated by molecular methods to study their effects on the initiation, promotion, and progression of atherosclerosis. Most clinicians and many investigators, even in related disciplines, find many of these genes and the related pathways entirely foreign. Medical schools generally do not attempt to incorporate the relevant molecular biology into their curriculum. A number of key signaling pathways are highly relevant to atherogenesis and are presented to provide a context for the gene manipulations summarized herein. The pathways include the following: the insulin receptor (and other receptor tyrosine kinases); Ras and MAPK activation; TNF-α and related family members leading to activation of NF-κB; effects of reactive oxygen species (ROS) on signaling; endothelial adaptations to flow including G protein-coupled receptor (GPCR) and integrin-related signaling; activation of endothelial and other cells by modified lipoproteins; purinergic signaling; control of leukocyte adhesion to endothelium, migration, and further activation; foam cell formation; and macrophage and vascular smooth muscle cell signaling related to proliferation, efferocytosis, and apoptosis. This review is intended primarily as an introduction to these key signaling pathways. They have become the focus of modern atherosclerosis research and will undoubtedly provide a rich resource for future innovation toward intervention and prevention of the number one cause of death in the modern world.
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Affiliation(s)
- Paul N Hopkins
- Cardiovascular Genetics, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.
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22
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Chen F, Qian LH, Deng B, Liu ZM, Zhao Y, Le YY. Resveratrol protects vascular endothelial cells from high glucose-induced apoptosis through inhibition of NADPH oxidase activation-driven oxidative stress. CNS Neurosci Ther 2013; 19:675-81. [PMID: 23731528 DOI: 10.1111/cns.12131] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 04/26/2013] [Accepted: 04/27/2013] [Indexed: 01/09/2023] Open
Abstract
INTRODUCTION Hyperglycemia-induced oxidative stress has been implicated in diabetic vascular complications in which NADPH oxidase is a major source of reactive oxygen species (ROS) generation. Resveratrol is a naturally occurring polyphenol, which has vasoprotective effects in diabetic animal models and inhibits high glucose (HG)-induced oxidative stress in endothelial cells. AIMS We aimed to examine whether HG-induced NADPH oxidase activation and ROS production contribute to glucotoxicity to endothelial cells and the effect of resveratrol on glucotoxicity. RESULTS Using a murine brain microvascular endothelial cell line bEnd3, we found that NADPH oxidase inhibitor (apocynin) and resveratrol both inhibited HG-induced endothelial cell apoptosis. HG-induced elevation of NADPH oxidase activity and production of ROS were inhibited by apocynin, suggesting that HG induces endothelial cell apoptosis through NADPH oxidase-mediated ROS production. Mechanistic studies revealed that HG upregulated NADPH oxidase subunit Nox1 but not Nox2, Nox4, and p22(phox) expression through NF-κB activation, which resulted in elevation of NADPH oxidase activity and consequent ROS production. Resveratrol prevented HG-induced endothelial cell apoptosis through inhibiting HG-induced NF-κB activation, NADPH oxidase activity elevation, and ROS production. CONCLUSIONS HG induces endothelial cell apoptosis through NF-κB/NADPH oxidase/ROS pathway, which was inhibited by resveratrol. Our findings provide new potential therapeutic targets against brain vascular complications of diabetes.
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Affiliation(s)
- Feng Chen
- Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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Xie X, Peng J, Chang X, Huang K, Huang J, Wang S, Shen X, Liu P, Huang H. Activation of RhoA/ROCK regulates NF-κB signaling pathway in experimental diabetic nephropathy. Mol Cell Endocrinol 2013; 369:86-97. [PMID: 23376009 DOI: 10.1016/j.mce.2013.01.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 01/10/2013] [Accepted: 01/13/2013] [Indexed: 10/27/2022]
Abstract
Both RhoA/ROCK and NF-κB signaling pathways play important roles in the pathogenesis of diabetic nephropathy (DN). However, it remains unknown whether and how RhoA/ROCK regulates NF-κB signaling in diabetic kidneys. In cultured glomerular mesangial cells (GMCs), the high glucose-activated NF-κB nuclear translocation and DNA binding activity were attenuated by ROCK inhibitor Y27632 or dominant-negative RhoA mutant, indicating that RhoA/ROCK signaling regulates high glucose-activated NF-κB pathway. Furthermore, NF-κB-regulated inflammatory factors ICAM-1 and TGF-β1 were markedly increased in high glucose-treated GMCs, leading to accumulation of fibronectin (FN), an important component of extracellular matrix (ECM), This effect was also effectively attenuated by Y27632 or dominant-negative RhoA mutant. In STZ-induced diabetic rats, treatment with ROCK inhibitor fasudil suppressed the RhoA/ROCK activation and NF-κB nuclear translocation, and significantly reduced the renal FN, ICAM-1 and TGF-β1 protein levels. Thus, the RhoA/ROCK pathway may regulate NF-κB to upregulate inflammatory genes and mediate the development of DN.
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Affiliation(s)
- Xi Xie
- Laboratory of Pharmacology & Toxicology, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China
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Chen YY, Chen J, Hu JW, Yang ZL, Shen YL. Enhancement of lipopolysaccharide-induced toll-like receptor 2 expression and inflammatory cytokine secretion in HUVECs under high glucose conditions. Life Sci 2013; 92:582-8. [PMID: 23369747 DOI: 10.1016/j.lfs.2013.01.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 12/05/2012] [Accepted: 01/15/2013] [Indexed: 12/11/2022]
Abstract
AIMS Endothelial inflammatory responses mediated by toll-like receptors (TLRs) play an important role in atherogenesis. We aimed to investigate the exacerbation of an inflammatory response in human umbilical vein endothelial cells (HUVECs) under high glucose conditions. MAIN METHODS HUVECs were exposed to normal glucose (5.5 mmol/L) and high glucose (25, 50 mmol/L), alone or with lipopolysaccharide (LPS 0, 10, 100, or 1000 μg/L). Then concentrations of TNF-α and IL-6 in the culture supernatants were determined. The expression of toll-like receptor 2 (TLR2), TLR4 and NF-κB was evaluated by Western blot and RT-PCR analysis. KEY FINDINGS Compared with the normal glucose group, exposure of HUVECs to 50 mmol/L of glucose or 1000 μg/L of LPS significantly increased the concentrations of TNF-α and IL-6 in the culture supernatants. Neither 25 mmol/L of glucose nor low concentration of LPS (≤100 μg/L) alone had an effect on TNF-α and IL-6 release, or TLR2 expression, but they stimulated the inflammatory response and TLR2 expression under high glucose conditions (25 mmol/L) in combination. LPS (100 μg/L) did not alter the TLR4 expression in HUVECs under high glucose condition. Co-incubation with glucose and LPS increased the nuclear NF-κB expression in endothelial cells. Both NF-κB inhibitor and ROS scavenger could inhibit the enhancement of LPS-induced TLR2 expression and inflammatory cytokine secretion under high glucose conditions. SIGNIFICANCE We show in vitro data on the potential role of high glucose in increasing LPS-induced TLR2 expression and inflammatory cytokine secretion in HUVECs, offering a new insight into the pathophysiological pathways involved in atherosclerosis.
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Affiliation(s)
- Ying-ying Chen
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou 310058, China
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Shah A, Xia L, Goldberg H, Lee KW, Quaggin SE, Fantus IG. Thioredoxin-interacting protein mediates high glucose-induced reactive oxygen species generation by mitochondria and the NADPH oxidase, Nox4, in mesangial cells. J Biol Chem 2013; 288:6835-48. [PMID: 23329835 DOI: 10.1074/jbc.m112.419101] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Thioredoxin-interacting protein (TxNIP) is up-regulated by high glucose and is associated with oxidative stress. It has been implicated in hyperglycemia-induced β-cell dysfunction and apoptosis. As high glucose and oxidative stress mediate diabetic nephropathy (DN), the contribution of TxNIP was investigated in renal mesangial cell reactive oxygen species (ROS) generation and collagen synthesis. To determine the role of TxNIP, mouse mesangial cells (MC) cultured from wild-type C3H and TxNIP-deficient Hcb-19 mice were incubated in HG. Confocal microscopy was used to measure total and mitochondrial ROS production (DCF and MitoSOX) and collagen IV. Trx and NADPH oxidase activities were assayed and NADPH oxidase isoforms, Nox2 and Nox4, and antioxidant enzymes were determined by immunoblotting. C3H MC exposed to HG elicited a significant increase in cellular and mitochondrial ROS as well as Nox4 protein expression and NADPH oxidase activation, whereas Hcb-19 MC showed no response. Trx activity was attenuated by HG only in C3H MC. These defects in Hcb-19 MC were not due to increased antioxidant enzymes or scavenging of ROS, but associated with decreased ROS generation. Adenovirus-mediated overexpression of TxNIP in Hcb-19 MC and TxNIP knockdown with siRNA in C3H confirmed the specific role of TxNIP. Collagen IV accumulation in HG was markedly reduced in Hcb-19 cells. TxNIP is a critical component of the HG-ROS signaling pathway, required for the induction of mitochondrial and total cell ROS and the NADPH oxidase isoform, Nox4. TxNIP is a potential target to prevent DN.
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Affiliation(s)
- Anu Shah
- Department of Medicine and Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario M5T 3L9, Canada
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Francés DE, Ingaramo PI, Ronco MT, Carnovale CE. Diabetes, an inflammatory process: Oxidative Stress and TNF-alpha involved in hepatic complication. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jbise.2013.66079] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Koo TY, Kim YJ, Yang WS, Park JS, Han NJ, Lee JM, Park SK. Mycophenolic acid regulates spleen tyrosine kinase to repress tumour necrosis factor-alpha-induced monocyte chemotatic protein-1 production in cultured human aortic endothelial cells. Cell Biol Int 2012; 37:19-28. [PMID: 23319318 DOI: 10.1002/cbin.10003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 09/14/2012] [Indexed: 11/08/2022]
Abstract
Atherosclerosis develops from cascades of inflammatory processes. Spleen tyrosine kinase (Syk) and monocyte chemotatic protein-1 (MCP-1) play important roles in the pathogenesis of atherosclerosis. Mycophenolic acid (MPA) has an anti-inflammatory effect. We have investigated whether MPA regulates Syk to repress tumour necrosis factor-α (TNF-α)-induced MCP-1 production in cultured human aortic endothelial cells. Expression of MCP-1 mRNA and its protein were measured by real time RT-PCR and ELISA, respectively. Reactive oxygen species (ROS) production were measured using 2'7'-dichlorofluorescein diacetate. Activation of AP-1 and NF-κB were assessed by electrophoretic mobility shift assay. Tyrosine phosphorylation of Syk was examined by Western blot analysis. TNF-α increased MCP-1 at both mRNA and protein levels. TNF-α-induced MCP-1 mRNA expression was inhibited by N-acetylcysteine (NAC), Syk inhibitor, Syk-siRNA and MPA. TNF-α-induced MCP-1 protein production was also inhibited by Syk inhibitor and MPA. TNF-α increased DNA binding activity of AP-1 and NF-κB, whereas both AP-1 and NF-κB decoy oligodeoxynucleotides downregulated TNF-α-induced MCP-1 mRNA expression. TNF-α increased ROS generation, which was inhibited by NAC and MPA, but not by Syk inhibitor. TNF-α increased tyrosine phosphorylation of Syk, which was attenuated by NAC and MPA. MPA and Syk inhibitor attenuated TNF-α-induced DNA binding activity of NF-κB and AP-1. TNF-α induced MCP-1 expression via activation of AP-1 and NF-κB. AP-1 and NF-κB were mediated through ROS, followed by Syk. MPA exerts anti-inflammatory effect by inhibiting MCP-1 expression via suppression of ROS and Syk.
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Affiliation(s)
- Tai Yeon Koo
- Division of Nephrology, Department of Internal Medicine, Asan Medical Center, University of Ulsan, Seoul, Republic of Korea
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Yang WS, Chang JW, Han NJ, Lee SK, Park SK. Spleen tyrosine kinase mediates high glucose-induced transforming growth factor-β1 up-regulation in proximal tubular epithelial cells. Exp Cell Res 2012; 318:1867-76. [PMID: 22659134 DOI: 10.1016/j.yexcr.2012.05.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Revised: 04/23/2012] [Accepted: 05/16/2012] [Indexed: 11/18/2022]
Abstract
The role of spleen tyrosine kinase (Syk) in high glucose-induced intracellular signal transduction has yet to be elucidated. We investigated whether Syk is implicated in high glucose-induced transforming growth factor-β1 (TGF-β1) up-regulation in cultured human proximal tubular epithelial cells (HK-2 cell). High glucose increased TGF-β1 gene expression through Syk, extracellular signal-regulated kinase (ERK), AP-1 and NF-κB. High glucose-induced AP-1 DNA binding activity was decreased by Syk inhibitors and U0126 (an ERK inhibitor). Syk inhibitors suppressed high glucose-induced ERK activation, whereas U0126 had no effect on Syk activation. High glucose-induced NF-κB DNA binding activity was also decreased by Syk inhibitors. High glucose increased nuclear translocation of p65 without serine phosphorylation of IκBα and without degradation of IκBα, but with an increase in tyrosine phosphorylation of IκBα that may account for the activation of NF-κB. Both Syk inhibitors and Syk-siRNA attenuated high glucose-induced IκBα tyrosine phosphorylation and p65 nuclear translocation. Depletion of p21-activated kinase 2 (Pak2) by transfection of Pak2-siRNA abolished high glucose-induced Syk activation. In summary, high glucose-induced TGF-β1 gene transcription occurred through Pak2, Syk and subsequent ERK/AP-1 and NF-κB pathways. This suggests that Syk might be implicated in the diabetic kidney disease.
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Affiliation(s)
- Won Seok Yang
- Division of Nephrology, Department of Internal Medicine, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea
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29
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Deiuliis JA, Kampfrath T, Ying Z, Maiseyeu A, Rajagopalan S. Lipoic acid attenuates innate immune infiltration and activation in the visceral adipose tissue of obese insulin resistant mice. Lipids 2011; 46:1021-32. [PMID: 21861137 DOI: 10.1007/s11745-011-3603-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 07/19/2011] [Indexed: 01/04/2023]
Abstract
Visceral adipose inflammation mediated by innate and adaptive immune alterations plays a critical role in diet-induced obesity and insulin resistance (IR). The dietary supplement α-lipoic acid (αLA) has been shown to ameliorate inflammatory processes in macrophages, however the relative significance of these effects in the context of visceral adipose inflammation and IR remain unknown. In this study we investigated its effects via both intraperitoneal and oral administration in lean and obese transgenic mice expressing yellow fluorescent protein (YFP) under control of a monocyte specific promoter (c-fms(YFP+)). αLA significantly improved indices of insulin-resistance concomitant with a decrease in total (YFP(+)CD11b(+)) and activated (YFP(+)CD11b(+)CD11c(+)) visceral adipose tissue macrophages. Histologically, the visceral adipose tissue of obese mice receiving αLA had fewer "crown-like structures," a hallmark of adipose inflammation in murine obesity. Monocyte adhesion assessed by intravital microscopy of cremasteric venules was attenuated by αLA. In cultured WT and toll-like receptor 4 (TLR4) null primary mouse macrophages, αLA significantly decreased basal CCR-2, MCP-1 and TNF-α expression levels. LPS treatment resulted in increased TNFα, MCP-1, and IL-6 expression while αLA partially abrogated the LPS effect on MCP-1 and TNFα; Interestingly, CCR-2 was not coordinately regulated. AαLA prevented LPS-induced nuclear factor kappa B (NFκB) activation in the same cultured macrophages. These data suggest that αLA may modulate visceral adipose inflammation, a critical determinant of IR via TLR4 and NF-κB pathways.
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Affiliation(s)
- J A Deiuliis
- Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA.
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Hou CL, Zhang W, Wei Y, Mi JH, Li L, Zhou ZH, Zeng W, Ying DJ. Zinc finger protein A20 overexpression inhibits monocyte homing and protects endothelial cells from injury induced by high glucose. GENETICS AND MOLECULAR RESEARCH 2011; 10:1050-9. [PMID: 21710455 DOI: 10.4238/vol10-2gmr1102] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Diabetes mellitus causes vascular lesions and may ultimately lead to atherosclerosis. One of the earliest steps in the development of atherosclerotic lesions is the adhesion of monocytes to endothelial cells of the vessel wall. It is currently unknown whether zinc finger protein A20 is able to protect endothelial cells from injury caused by high levels of glucose and monocyte homing. In our study, adhesion of monocytes to the vessel wall endothelium was detected by measuring the rolling velocity of monocytes along human umbilical vein endothelial cells (HUVECs). Activation of NF-κB was analyzed through Western blot. HUVEC apoptosis was monitored by TUNEL in situ end-labeling and flow cytometry. High glucose concentrations (25 mM) stimulated monocytes, reducing the velocity at which they roll along HUVECs. Stimulation of monocytes with high levels of glucose also induced HUVEC apoptosis. Overexpression of the zinc finger protein A20 inhibited monocyte recruitment, NF-κB activation, P-selectin expression, and HUVEC apoptosis induced by high glucose levels. We conclude that zinc finger protein A20 can protect HUVECs from injury induced by high levels of glucose and potentially could be used to develop treatments against diabetic vascular lesions.
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Affiliation(s)
- C L Hou
- Department of Anatomy, The Key Lab of Biomechanics, The Third Military Medical University, Chongqing, China
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31
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Lim JC, Lim SK, Park MJ, Kim GY, Han HJ, Park SH. Cannabinoid receptor 1 mediates high glucose-induced apoptosis via endoplasmic reticulum stress in primary cultured rat mesangial cells. Am J Physiol Renal Physiol 2011; 301:F179-88. [PMID: 21325497 DOI: 10.1152/ajprenal.00032.2010] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The endocannabinoid system in animals and humans is involved in the onset of diverse diseases, including obesity and diabetic nephropathy, which is a major end-stage renal disease characterized by high glucose (HG)-induced apoptosis of mesangial cells. Endocannabinoids induce physiological and behavioral effects by activating two specific receptors, cannabinoid receptor 1 (CB(1)R) and cannabinoid receptor 2 (CB(2)R). However, the pathophysiology of CB(1)R in diabetic nephropathy has not been elucidated. We investigated the effects of HG on CB(1)R expression and its signaling pathways in primary cultured rat mesangial cells. HG significantly increased CB(1)R mRNA and protein levels in a time-dependent manner and induced CB(1)R internalization. NF-κB and cPLA(2) were involved in the HG-induced increase in CB(1)R levels. Using a CB(1)R antagonist (AM251) and CB(1) siRNA transfection, we showed that HG-induced CB(1)R is linked to apoptosis. Specifically, HG inhibited the expression of GRP78, but induced increases in endoplasmic reticulum (ER) stress proteins, including phosphorylated (p)-protein kinase-like ER-associated kinase, p-eukaryotic initiation factor 2α, p-activating transcription factor-4, and C/EBP homologous protein. In addition, HG increased the Bax/Bcl-2 ratio and increased the amounts of cleaved poly(ADP-ribose) polymerase and caspase-3. These apoptotic effects were prevented by AM251 and by the downregulation of CB(1)R expression by small interfering RNA. We propose a mechanism by which blockade of CB(1)R attenuates HG-induced apoptosis in rat mesangial cells. Our findings suggest that blockade of CB(1)R may be a potential therapy in diabetic nephropathy.
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Affiliation(s)
- Jae Cheong Lim
- Bio-therapy Human Resources Center, Dept. of Veterinary Physiology, College of Veterinary Medicine, Chonnam National University, Kwangju 500-757, Korea
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Aggarwal BB. Targeting inflammation-induced obesity and metabolic diseases by curcumin and other nutraceuticals. Annu Rev Nutr 2010; 30:173-99. [PMID: 20420526 DOI: 10.1146/annurev.nutr.012809.104755] [Citation(s) in RCA: 285] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Extensive research within the past two decades has revealed that obesity, a major risk factor for type 2 diabetes, atherosclerosis, cancer, and other chronic diseases, is a proinflammatory disease. Several spices have been shown to exhibit activity against obesity through antioxidant and anti-inflammatory mechanisms. Among them, curcumin, a yellow pigment derived from the spice turmeric (an essential component of curry powder), has been investigated most extensively as a treatment for obesity and obesity-related metabolic diseases. Curcumin directly interacts with adipocytes, pancreatic cells, hepatic stellate cells, macrophages, and muscle cells. There, it suppresses the proinflammatory transcription factors nuclear factor-kappa B, signal transducer and activators of transcription-3, and Wnt/beta-catenin, and it activates peroxisome proliferator-activated receptor-gamma and Nrf2 cell-signaling pathways, thus leading to the downregulation of adipokines, including tumor necrosis factor, interleukin-6, resistin, leptin, and monocyte chemotactic protein-1, and the upregulation of adiponectin and other gene products. These curcumin-induced alterations reverse insulin resistance, hyperglycemia, hyperlipidemia, and other symptoms linked to obesity. Other structurally homologous nutraceuticals, derived from red chili, cinnamon, cloves, black pepper, and ginger, also exhibit effects against obesity and insulin resistance.
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Affiliation(s)
- Bharat B Aggarwal
- Cytokine Research Laboratory, Department of Experimental Therapeutics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA.
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Lim SK, Han HJ, Kim KY, Park SH. Both B1R and B2R act as intermediate signaling molecules in high glucose-induced stimulation of glutamate uptake in ARPE cells. J Cell Physiol 2009; 221:677-87. [DOI: 10.1002/jcp.21906] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lo CS, Chen CH, Hsieh TJ, Lin KD, Hsiao PJ, Shin SJ. Local action of endogenous renal tubular atrial natriuretic peptide. J Cell Physiol 2009; 219:776-86. [PMID: 19229880 DOI: 10.1002/jcp.21728] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Up-regulation of atrial natriuretic peptide (ANP) mRNA in the kidneys in several disorders has been demonstrated; however, evidence that ANP synthesized by the kidney exerts a local function has never been produced. Therefore, we investigated whether endogenous ANP could modulate high glucose-stimulated TGF-beta1, collagen type I and nuclear factor-kappaB (NF-kappaB) in NRK-52E cells using transfection of ANP and ANP small interfering RNA (siANP). NRK-52E cells were grown with or without transfection with ANP plasmid; cells were also transfected with ANP siRNA or control siRNA. These cells were then stimulated with a high glucose concentration to modulate ANP, TGF-beta1, collagen type I, NF-kappaB and IkappaB-alpha, and the results showed that ANP, TGF-beta1, collagen type I and NF-kappaB significantly increased in untransfected cells, and the transfection of ANP significantly attenuated high glucose-activated TGF-beta1, collagen I and NF-kappaB expression. ANP siRNA knocked-down ANP but significantly increased TGF-beta1 and collagen I under normal glucose conditions; ANP siRNA decreased IkappaB-alpha but strongly enhanced high glucose-activated TGF-beta1, collagen type I and NF-kappaB. In contrast, medium from ANP-transfected cells attenuated high glucose-activated TGF-beta1 and collagen type I expression in NRK-52E cells transfected with siANP. In conclusion, our results demonstrated that siANP increased activation of TGF-beta1, collagen type I and NF-kappaB in NRK-52E cells under high glucose conditions, and medium from ANP-transfected cells attenuated high glucose-activated TGF-beta1 and collagen type I. This is the first study to demonstrate the auto/paracrine action of endogenous ANP in renal tubular cells on the attenuation of hyperglycemia-activated TGF-beta1 and NF-kappaB expression. J. Cell. Physiol. 219: 776-786, 2009. (c) 2009 Wiley-Liss, Inc.
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Affiliation(s)
- Chao-Sheng Lo
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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