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Nie MS, Li XH, Zhang S, Zeng DD, Cai YR, Peng DX, Jiang T, Shi JP, Li J. Screening for anti-influenza virus compounds from traditional Mongolian medicine by GFP-based reporter virus. Front Cell Infect Microbiol 2024; 14:1431979. [PMID: 39071166 PMCID: PMC11272615 DOI: 10.3389/fcimb.2024.1431979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 06/25/2024] [Indexed: 07/30/2024] Open
Abstract
Introduction Screening for effective antiviral compounds from traditional Mongolian medicine not only aids in the research of antiviral mechanisms of traditional medicines, but is also of significant importance for the development of new antiviral drugs targeting influenza A virus. Our study aimed to establish high-throughput, rapid screening methods for antiviral compounds against influenza A virus from abundant resources of Mongolian medicine. Methods The use of GFP-based reporter viruses plays a pivotal role in antiviral drugs screening by enabling rapid and precise identification of compounds that inhibit viral replication. Herein, a GFP-based reporter influenza A virus was used to identify potent anti-influenza compounds within traditional Mongolian medicine. Results Our study led to the discovery of three active compounds: Cardamonin, Curcumin, and Kaempferide, all of which exhibited significant antiviral properties in vitro. Subsequent analysis confirmed that their effectiveness was largely due to the stimulation of the antiviral signaling pathways of host cells, rather than direct interference with the viral components, such as the viral polymerase. Discussion This study showcased the use of GFP-based reporter viruses in high-throughput screening to unearth antiviral agents from traditional Mongolian medicine, which contains rich antiviral compounds and deserves further exploration. Despite certain limitations, fluorescent reporter viruses present substantial potential for antiviral drug screening research due to their high throughput and efficiency.
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Affiliation(s)
- Mao-Shun Nie
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Xiao-He Li
- College of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Sen Zhang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China
| | - Dan-Dan Zeng
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China
| | - Yu-Rong Cai
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China
| | - Da-Xin Peng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Tao Jiang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China
| | - Jian-Ping Shi
- College of Traditional Chinese Medicine, Inner Mongolia Medical University, Hohhot, China
| | - Jing Li
- College of Basic Medical Sciences, Inner Mongolia Medical University, Hohhot, China
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China
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2
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Bai B, Wan C, Xiao Z, Li D, Liu L, Zhang K, Zhang T, Zhang Q. High Homocysteine-Thiolactone Leads to Reduced MENIN Protein Expression and an Impaired DNA Damage Response: Implications for Neural Tube Defects. Mol Neurobiol 2024:10.1007/s12035-024-04033-7. [PMID: 38386135 DOI: 10.1007/s12035-024-04033-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 02/10/2024] [Indexed: 02/23/2024]
Abstract
DNA damage is associated with hyperhomocysteinemia (HHcy) and neural tube defects (NTDs). Additionally, HHcy is a risk factor for NTDs. Therefore, this study examined whether DNA damage is involved in HHcy-induced NTDs and investigated the underlying pathological mechanisms involved. Embryonic day 9 (E9) mouse neuroectoderm cells (NE4C) and homocysteine-thiolactone (HTL, active metabolite of Hcy)-induced NTD chicken embryos were studied by Western blotting, immunofluorescence. RNA interference or gene overexpression techniques were employed to investigate the impact of Menin expression changes on the DNA damage. Chromatin immunoprecipitation-quantitative polymerase chain reaction was used to investigate the epigenetic regulation of histone modifications. An increase in γH2AX (a DNA damage indicator) was detected in HTL-induced NTD chicken embryos and HTL-treated NE4C, accompanied by dysregulation of phospho-Atr-Chk1-nucleotide excision repair (NER) pathway. Further investigation, based on previous research, revealed that disruption of NER was subject to the epigenetic regulation of low-expressed Menin-H3K4me3. Overexpression of Menin or supplementation with folic acid in HTL-treated NE4C reversed the adverse effects caused by high HTL. Additionally, by overexpressing the Mars gene, we tentatively propose a mechanism whereby HTL regulates Menin expression through H3K79hcy, which subsequently influences H3K4me3 modifications, reflecting an interaction between histone modifications. Finally, in 10 human fetal NTDs with HHcy, we detected a decrease in the expression of Menin-H3K4me3 and disorder in the NER pathway, which to some extent validated our proposed mechanism. The present study demonstrated that the decreased expression of Menin in high HTL downregulated H3K4me3 modifications, further weakening the Atr-Chk1-NER pathway, resulting in the occurrence of NTDs.
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Affiliation(s)
- Baoling Bai
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China
| | - Chunlei Wan
- Department of Pediatrics, Tongzhou Maternal and Child Health Care Hospital, Beijing, 101101, China
| | - Zonghui Xiao
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China
| | - Dan Li
- Department of Pediatrics, Tongzhou Maternal and Child Health Care Hospital, Beijing, 101101, China
| | - Lingyun Liu
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China
| | - Kexin Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China
| | - Ting Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China.
| | - Qin Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Yabao Road 2, Beijing, 100020, China.
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Trelford CB, Dagnino L, Di Guglielmo GM. Transforming growth factor-β in tumour development. Front Mol Biosci 2022; 9:991612. [PMID: 36267157 PMCID: PMC9577372 DOI: 10.3389/fmolb.2022.991612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/15/2022] [Indexed: 11/14/2022] Open
Abstract
Transforming growth factor-β (TGFβ) is a ubiquitous cytokine essential for embryonic development and postnatal tissue homeostasis. TGFβ signalling regulates several biological processes including cell growth, proliferation, apoptosis, immune function, and tissue repair following injury. Aberrant TGFβ signalling has been implicated in tumour progression and metastasis. Tumour cells, in conjunction with their microenvironment, may augment tumourigenesis using TGFβ to induce epithelial-mesenchymal transition, angiogenesis, lymphangiogenesis, immune suppression, and autophagy. Therapies that target TGFβ synthesis, TGFβ-TGFβ receptor complexes or TGFβ receptor kinase activity have proven successful in tissue culture and in animal models, yet, due to limited understanding of TGFβ biology, the outcomes of clinical trials are poor. Here, we review TGFβ signalling pathways, the biology of TGFβ during tumourigenesis, and how protein quality control pathways contribute to the tumour-promoting outcomes of TGFβ signalling.
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Affiliation(s)
- Charles B. Trelford
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Lina Dagnino
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
- Department of Oncology, Children’s Health Research Institute and Lawson Health Research Institute, London, ON, Canada
| | - Gianni M. Di Guglielmo
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
- *Correspondence: Gianni M. Di Guglielmo,
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4
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Wusiman W, Zhang Z, Ding Q, Liu M. The pathophyiological role of aminoacyl-tRNA synthetases in digestive system diseases. Front Physiol 2022; 13:935576. [PMID: 36017335 PMCID: PMC9396140 DOI: 10.3389/fphys.2022.935576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 07/05/2022] [Indexed: 12/24/2022] Open
Abstract
Aminoacyl-tRNA synthetases (ARSs) catalyze the ligation of amino acids to their cognate transfer RNAs and are indispensable enzymes for protein biosynthesis in all the cells. Previously, ARSs were considered simply as housekeeping enzymes, however, they are now known to be involved in a variety of physiological and pathological processes, such as tumorigenesis, angiogenesis, and immune response. In this review, we summarize the role of ARSs in the digestive system, including the esophagus, stomach, small intestine, colon, as well as the auxiliary organs such as the pancreas, liver, and the gallbladder. Furthermore, we specifically focus on the diagnostic and prognostic value of ARSs in cancers, aiming to provide new insights into the pathophysiological implications of ARSs in tumorigenesis.
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Affiliation(s)
- Wugelanmu Wusiman
- Department of Gastroenterology, Institute of Liver and Gastrointestinal Diseases, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zerui Zhang
- Department of Gastroenterology, Institute of Liver and Gastrointestinal Diseases, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qiang Ding
- Department of Gastroenterology, Institute of Liver and Gastrointestinal Diseases, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Mei Liu
- Department of Gastroenterology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- *Correspondence: Mei Liu,
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Trelford CB, Di Guglielmo GM. Canonical and Non-canonical TGFβ Signaling Activate Autophagy in an ULK1-Dependent Manner. Front Cell Dev Biol 2021; 9:712124. [PMID: 34760883 PMCID: PMC8573198 DOI: 10.3389/fcell.2021.712124] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 10/04/2021] [Indexed: 12/12/2022] Open
Abstract
The mechanism(s) in which transforming growth factor beta 1 (TGFβ) modulates autophagy in cancer remain unclear. Here, we characterized the TGFβ signaling pathways that induce autophagy in non-small cell lung cancer cells, using cells lines stably expressing GFP-LC3-RFP-LC3ΔG constructs that measure autophagic flux. We demonstrated that TGFβ1 increases Unc 51-like kinase 1 (ULK1) protein levels, 5' adenosine monophosphate-activated protein kinase (AMPK)-dependent ULK1 phosphorylation at serine (S) 555 and ULK1 complex formation but decreases mechanistic target of rapamycin (mTOR) activity on ULK1. Further analysis revealed that the canonical Smad4 pathway and the non-canonical TGFβ activated kinase 1/tumor necrosis factor receptor-associated factor 6/P38 mitogen activated protein kinase (TAK1-TRAF6-P38 MAPK) pathway are important for TGFβ1-induced autophagy. The TAK1-TRAF6-P38 MAPK pathway was essential for downregulating mTOR S2448 phosphorylation, ULK1 S555 phosphorylation and autophagosome formation. Furthermore, although siRNA-mediated Smad4 silencing did not alter mTOR-dependent ULK1 S757 phosphorylation, it did reduce AMPK-dependent ULK1 S555 phosphorylation and autophagosome formation. Additionally, Smad4 silencing and inhibiting the TAK1-TRAF6-P38 MAPK pathway decreased autophagosome-lysosome co-localization in the presence of TGFβ. Our results suggest that the Smad4 and TAK1-TRAF6-P38 MAPK signaling pathways are essential for TGFβ-induced autophagy and provide specific targets for the inhibition of TGFβ in tumor cells that utilize autophagy in their epithelial-mesenchymal transition program.
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Affiliation(s)
| | - Gianni M. Di Guglielmo
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
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6
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Tawfik A, Elsherbiny NM, Zaidi Y, Rajpurohit P. Homocysteine and Age-Related Central Nervous System Diseases: Role of Inflammation. Int J Mol Sci 2021; 22:ijms22126259. [PMID: 34200792 PMCID: PMC8230490 DOI: 10.3390/ijms22126259] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 06/02/2021] [Accepted: 06/07/2021] [Indexed: 02/07/2023] Open
Abstract
Hyperhomocysteinemia (HHcy) is remarkably common among the aging population. The relation between HHcy and the development of neurodegenerative diseases, such as Alzheimer's disease (AD) and eye diseases, and age-related macular degeneration (AMD) and diabetic retinopathy (DR) in elderly people, has been established. Disruption of the blood barrier function of the brain and retina is one of the most important underlying mechanisms associated with HHcy-induced neurodegenerative and retinal disorders. Impairment of the barrier function triggers inflammatory events that worsen disease pathology. Studies have shown that AD patients also suffer from visual impairments. As an extension of the central nervous system, the retina has been suggested as a prominent site of AD pathology. This review highlights inflammation as a possible underlying mechanism of HHcy-induced barrier dysfunction and neurovascular injury in aging diseases accompanied by HHcy, focusing on AD.
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Affiliation(s)
- Amany Tawfik
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA; (N.M.E.); (Y.Z.); (P.R.)
- James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA
- Department of Cellular Biology and Anatomy, Medical College of Georgia (MCG), Augusta University, Augusta, GA 30912, USA
- Department of Ophthalmology, MCG, Augusta University, Augusta, GA 30912, USA
- Eye Research Institue, Oakland University, Rochester, MI 48309, USA
- Correspondence: ; Tel.: +1-706-721-2582; Fax: +1-706-721-9415
| | - Nehal M. Elsherbiny
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA; (N.M.E.); (Y.Z.); (P.R.)
- James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA
- Department of Biochemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Yusra Zaidi
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA; (N.M.E.); (Y.Z.); (P.R.)
- James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA
| | - Pragya Rajpurohit
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA; (N.M.E.); (Y.Z.); (P.R.)
- James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA
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7
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Ngowi EE, Sarfraz M, Afzal A, Khan NH, Khattak S, Zhang X, Li T, Duan SF, Ji XY, Wu DD. Roles of Hydrogen Sulfide Donors in Common Kidney Diseases. Front Pharmacol 2020; 11:564281. [PMID: 33364941 PMCID: PMC7751760 DOI: 10.3389/fphar.2020.564281] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 09/30/2020] [Indexed: 12/15/2022] Open
Abstract
Hydrogen sulfide (H2S) plays a key role in the regulation of physiological processes in mammals. The decline in H2S level has been reported in numerous renal disorders. In animal models of renal disorders, treatment with H2S donors could restore H2S levels and improve renal functions. H2S donors suppress renal dysfunction by regulating autophagy, apoptosis, oxidative stress, and inflammation through multiple signaling pathways, such as TRL4/NLRP3, AMP-activated protein kinase/mammalian target of rapamycin, transforming growth factor-β1/Smad3, extracellular signal-regulated protein kinases 1/2, mitogen-activated protein kinase, and nuclear factor kappa B. In this review, we summarize recent developments in the effects of H2S donors on the treatment of common renal diseases, including acute/chronic kidney disease, renal fibrosis, unilateral ureteral obstruction, glomerulosclerosis, diabetic nephropathy, hyperhomocysteinemia, drug-induced nephrotoxicity, metal-induced nephrotoxicity, and urolithiasis. Novel H2S donors can be designed and applied in the treatment of common renal diseases.
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Affiliation(s)
- Ebenezeri Erasto Ngowi
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- Department of Biological Sciences, Faculty of Science, Dar es Salaam University College of Education, Dar es Salaam, Tanzania
| | - Muhammad Sarfraz
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- Kaifeng Municipal Key Laboratory of Cell Signal Transduction, Henan Provincial Engineering Centre for Tumor Molecular Medicine, Henan University, Kaifeng, China
- Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Attia Afzal
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Nazeer Hussain Khan
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- College of Pharmacy, Henan University, Kaifeng, China
| | - Saadullah Khattak
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
| | - Xin Zhang
- College of Pharmacy, Henan University, Kaifeng, China
- Institute for Innovative Drug Design and Evaluation, School of Pharmacy, Henan University, Kaifeng, China
| | - Tao Li
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
| | - Shao-Feng Duan
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- College of Pharmacy, Henan University, Kaifeng, China
- Institute for Innovative Drug Design and Evaluation, School of Pharmacy, Henan University, Kaifeng, China
| | - Xin-Ying Ji
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- Diseases and Bio-Safety, School of Basic Medical Sciences, Henan University, Kaifeng, China
| | - Dong-Dong Wu
- School of Basic Medical Sciences, Henan University, Kaifeng, China
- Henan International Joint Laboratory for Nuclear Protein Regulation, Henan University, Kaifeng, China
- School of Stomatology, Henan University, Kaifeng, China
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8
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Wang D, Zhao R, Qu YY, Mei XY, Zhang X, Zhou Q, Li Y, Yang SB, Zuo ZG, Chen YM, Lin Y, Xu W, Chen C, Zhao SM, Zhao JY. Colonic Lysine Homocysteinylation Induced by High-Fat Diet Suppresses DNA Damage Repair. Cell Rep 2019; 25:398-412.e6. [PMID: 30304680 DOI: 10.1016/j.celrep.2018.09.022] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 08/15/2018] [Accepted: 09/07/2018] [Indexed: 02/05/2023] Open
Abstract
Colorectal cancer (CRC) onset is profoundly affected by Western diet. Here, we report that high-fat (HF) diet-induced, organ-specific colonic lysine homocysteinylation (K-Hcy) increase might promote CRC onset by impeding DNA damage repair. HF chow induced elevated methionyl-tRNA synthetase (MARS) expression and K-Hcy levels and DNA damage accumulation in the mouse and rat colon, resulting in a phenotype identical to that of CRC tissues. Moreover, the increased copy number of MARS, whose protein product promotes K-Hcy, correlated with increased CRC risk in humans. Mechanistically, MARS preferentially bound to and modified ataxia-telangiectasia and Rad3-related protein (ATR), inhibited ATR and its downstream effectors checkpoint kinase-1 and p53, and relieved cell-cycle arrest and decreased DNA damage-induced apoptosis by disrupting the binding of ATR-interacting protein to ATR. Inhibiting K-Hcy by targeting MARS reversed these effects and suppressed oncogenic CRC cell growth. Our study reveals a mechanism of Western-diet-associated CRC and highlights an intervention approach for reversing diet-induced oncogenic effects.
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Affiliation(s)
- Dan Wang
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China; Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China; Department of Neonatology and Department of Colorectal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Rui Zhao
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China
| | - Yuan-Yuan Qu
- Department of Urology, Fudan University Shanghai Cancer Center, Shanghai 200438, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200438, China
| | - Xin-Yu Mei
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China
| | - Xuan Zhang
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China
| | - Qian Zhou
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China
| | - Yang Li
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China
| | - Shao-Bo Yang
- Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China
| | - Zhi-Gui Zuo
- Department of Neonatology and Department of Colorectal Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Yi-Ming Chen
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Yan Lin
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China; Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China
| | - Wei Xu
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China; Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China; Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Chao Chen
- Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China
| | - Shi-Min Zhao
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China; Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China; Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China.
| | - Jian-Yuan Zhao
- Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences and Institutes of Biomedical Sciences, Shanghai 200438, China; Key Laboratory of Reproduction Regulation of NPFPC, Collaborative Innovation Center for Genetics and Development and Children's Hospital of Fudan University, Shanghai 200438, China; Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China.
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Majumder S, Ren L, Pushpakumar S, Sen U. Hydrogen sulphide mitigates homocysteine-induced apoptosis and matrix remodelling in mesangial cells through Akt/FOXO1 signalling cascade. Cell Signal 2019; 61:66-77. [PMID: 31085234 PMCID: PMC6561819 DOI: 10.1016/j.cellsig.2019.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/28/2019] [Accepted: 05/02/2019] [Indexed: 12/17/2022]
Abstract
Cellular damage and accumulation of extracellular matrix (ECM) protein in the glomerulo-interstitial space are the signatures of chronic kidney disease (CKD). Hyperhomocysteinemia (HHcy), a high level of homocysteine (Hcy) is associated with CKD and further contributes to kidney damage. Despite a large number of studies, the signalling mechanism of Hcy-mediated cellular damage and ECM remodelling in kidney remains inconclusive. Hcy metabolizes to produce hydrogen sulphide (H2S), and a number of studies have shown that H2S mitigates the adverse effect of HHcy in a variety of diseases involving several signalling molecules, including forkhead box O (FOXO) protein. FOXO is a group of transcription factor that includes FOXO1, which plays important roles in cell growth and proliferation. On the other hand, a cell survival factor, Akt regulates FOXO under normal condition. However, the involvement of Akt/FOXO1 pathway in Hcy-induced mesangial cell damage remains elusive, and whether H2S plays any protective roles has yet to be clearly defined. We treated mouse mesangial cells with or without H2S donor, GYY4137 and FOXO1 inhibitor, AS1842856 in HHcy condition and determined the involvement of Akt/FOXO1 signalling cascades. Our results indicated that Hcy inactivated Akt and activated FOXO1 by dephosphorylating both the signalling molecules and induced FOXO1 nuclear translocation followed by activation of the FOXO1 transcription factor. These led to the induction of cellular apoptosis and synthesis of excessive ECM protein, in part, due to increased ROS production, loss of mitochondrial membrane potential (ΔΨm), reduction in intracellular ATP concentration, increased MMP-2, -9, -14 mRNA and protein expression, and Col I, IV and fibronectin protein expression. Interestingly, GYY4137 or AS1842856 treatment prevented these changes by modulating Akt/FOXO1 axis in HHcy. We conclude that GYY4137 and/or AS1842856 mitigates HHcy induced mesangial cell damage and ECM remodelling by regulating Akt/FOXO1 pathway.
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Affiliation(s)
- Suravi Majumder
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, United States of America
| | - Lu Ren
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN, United States of America
| | - Sathnur Pushpakumar
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, United States of America
| | - Utpal Sen
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, United States of America.
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10
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Homocysteine enhances neural stem cell autophagy in in vivo and in vitro model of ischemic stroke. Cell Death Dis 2019; 10:561. [PMID: 31332165 PMCID: PMC6646339 DOI: 10.1038/s41419-019-1798-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 06/27/2019] [Accepted: 07/03/2019] [Indexed: 12/20/2022]
Abstract
The elevated level of the amino acid metabolite homocysteine (Hcy) is known as a risk factor for ischemic stroke. The molecular mechanisms responsible for neurotoxicity of Hcy remain largely unknown in ischemic brains. The previous studies have shown that Hcy decreases the proliferation and viability of neural stem cells (NSCs) in vivo and in vitro. Autophagy is required for the maintenance of NSCs homeostasis. In the current study, we hypothesized that the toxic effect of Hcy on NSCs may involve the changes in autophagy level following cerebral ischemia/reperfusion injury. The results showed that Hcy reduced cell viability, increased LDH release, and induced nonapoptotic cell death in primary NSCs exposed to oxygen–glucose deprivation)/reoxygenation (OGD/R). Treatment with autophagy inhibitor 3-methyladenine (3MA) partly reversed the decrease in the viability and prevented LDH release triggered by Hcy combined with OGD/R. Increased punctate LC3 dots co-localizing with Nestin-stained NSCs were also observed in the subventricular zone of Hcy-treated MCAO animals, which were partially blocked by 3MA. In vitro studies further revealed that Hcy induced the formation of autophagosomes, markedly increased the expression of the autophagic markers and decreased p-ERK, p-PI3K, p-AKT, and p-mTOR levels. In addition, MHY1485, an activator of mTOR, reduced Hcy-induced increase in LC3 and Beclin 1 protein levels, meanwhile ERK and PI3K activators (TPA, curcumin for ERK and IGF-1 for PI3K, respectively) enhanced Hcy-triggered mTOR inhibition in OGD/R NSCs. Our findings suggest that Hcy may cause excessive autophagy by downregulation of both PI3K-AKT- and ERK- dependent mTOR signaling, thereby facilitates the toxicity of Hcy on NSCs in ischemic brains.
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Wang F, Qi X, Li Z, Jin S, Xie Y, Zhong H. lncRNA CADM1-AS1 inhibits cell-cycle progression and invasion via PTEN/AKT/GSK-3β axis in hepatocellular carcinoma. Cancer Manag Res 2019; 11:3813-3828. [PMID: 31118799 PMCID: PMC6503201 DOI: 10.2147/cmar.s197673] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 03/24/2019] [Indexed: 12/17/2022] Open
Abstract
Purpose: CADM1-AS1 (cell adhesion molecule 1 antisense RNA 1, long non-coding RNA), was firstly characterized in renal clear cell carcinoma, and exhibits a tumor suppressor role. However, its clinical relevance and exact effects in hepatocellular carcinoma (HCC) remain unknown. Therefore, in this study, we aimed to assess the clinical significance and function of CADM1-AS1 in HCC. Methods: We detected CADM1-AS1 expression in liver cancer tissue samples and cell lines, and analyzed the association between CADM1-AS1 expression and clinical parameters in 90 liver cancer patients. Moreover, we conducted gain-of-function and loss-of-function studies in liver cancer cell to explore the biological function and molecular mechanism of CADM1-AS1. Results: CADM1-AS1 expression was reduced in HCC. Clinical data showed that this downregulation was associated with advanced tumor stage, high TNM stage and reduced survival in HCC patients. CADM1-AS1 overexpression inhibited HCC cells proliferation, migration and invasion, while inducing G0/G1 phase arrest. Meanwhile, we revealed that CADM1-AS1 inhibited the phosphorylation of AKT and GSK-3β. Furthermore, our study showed that CADM1-AS1 decreased the cell cycle associated proteins expression of cyclinD, cyclinE, CDK2 CDK4, CDK6, and enhanced the levels of p15, p21 and p27. More importantly, SC79, a specific activator for AKT;, apparently attenuated the effects of CADM1-AS1 on above cell-cycle associated proteins, confirming that CADM1-AS1 inhibited cell cycles through the AKT signaling pathway. And we also found the CADM1-AS1 has antitumor effect in vivo by a xenograft HCC mouse model. In conclusion, the present findings show that the CADM1-AS1 inhibits proliferation of HCC by inhibiting AKT/GSK-3β signaling pathway, then upregulate p15, p21, p27 expression and downregulate cyclin, CDK expression to inhibit the G0/G1 to S phase transition both in vitro and in vivo. Conclusion: CADM1-AS1 functions as a tumor-suppressive lncRNA. This study reveals a molecular pathway involving PTEN/AKT/GSK-3β which regulates HCC cell-cycle progression.
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Affiliation(s)
- Fan Wang
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China
| | - Xun Qi
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China.,First Hospital of China Medical University, Key Laboratory of Imaging Diagnosis and Interventional Radiology of Liaoning Province, Shenyang, Liaoning, 110001, People's Republic of China
| | - Zixuan Li
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China.,First Hospital of China Medical University, Key Laboratory of Imaging Diagnosis and Interventional Radiology of Liaoning Province, Shenyang, Liaoning, 110001, People's Republic of China
| | - Shiqi Jin
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China
| | - Yang Xie
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China
| | - Hongshan Zhong
- Department of Radiology, First Hospital of China Medical University, Shenyang 110001, Liaoning, People's Republic of China.,First Hospital of China Medical University, Key Laboratory of Imaging Diagnosis and Interventional Radiology of Liaoning Province, Shenyang, Liaoning, 110001, People's Republic of China
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Zhao M, Yuan MM, Yuan L, Huang LL, Liao JH, Yu XL, Su C, Chen YH, Yang YY, Yu H, Xu DX. Chronic folate deficiency induces glucose and lipid metabolism disorders and subsequent cognitive dysfunction in mice. PLoS One 2018; 13:e0202910. [PMID: 30153273 PMCID: PMC6112663 DOI: 10.1371/journal.pone.0202910] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 08/10/2018] [Indexed: 12/11/2022] Open
Abstract
Previous studies have shown that folate levels were decreased in patients with type 2 diabetes (T2D) and further lowered in T2D patients with cognitive impairment. However, whether folate deficiency could cause T2D and subsequent cognitive dysfunction is still unknown. The present study aimed to explore the effects of chronic folate deficiency (CFD) on glucose and lipid metabolism and cognitive function in mice. Seven-week-old mice were fed with either a CFD or control diet for 25 weeks. Serum folate was significantly reduced, whereas serum total homocysteine was significantly increased in the CFD group. Moreover, CFD induced obesity after a 6-week diet treatment, glucose intolerance and insulin resistance after a 16-week-diet treatment. In addition, CFD reduced the hepatic p-Akt/Akt ratio in response to acute insulin administration. Moreover, CFD increased serum triglyceride levels, upregulated hepatic Acc1 and Fasn mRNA expression, and downregulated hepatic Cd36 and ApoB mRNA expression. After a 24-week diet treatment, CFD induced anxiety-related activities and impairment of spatial learning and memory performance. This study demonstrates that folate deficiency could induce obesity, glucose and lipid metabolism disorders and subsequent cognitive dysfunction.
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Affiliation(s)
- Mei Zhao
- School of Nursing, Anhui Medical University, Hefei, China
- Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China
| | - Man Man Yuan
- School of Nursing, Anhui Medical University, Hefei, China
| | - Li Yuan
- School of Nursing, Anhui Medical University, Hefei, China
| | - Li Li Huang
- School of Nursing, Anhui Medical University, Hefei, China
| | - Jian Hong Liao
- School of Nursing, Anhui Medical University, Hefei, China
| | - Xiao Ling Yu
- School of Nursing, Anhui Medical University, Hefei, China
| | - Chang Su
- School of Nursing, Anhui Medical University, Hefei, China
| | - Yuan Hua Chen
- Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China
- Department of Histology and Embryology, Anhui Medical University, Hefei, China
| | - Yu Ying Yang
- School of Nursing, Anhui Medical University, Hefei, China
| | - Huan Yu
- School of Nursing, Anhui Medical University, Hefei, China
| | - De Xiang Xu
- Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China
- Department of Toxicology, Anhui Medical University, Hefei, China
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Shamaladevi N, Araki S, Lyn DA, Ayyathurai R, Gao J, Lokeshwar VB, Navarrete H, Lokeshwar BL. The andean anticancer herbal product BIRM causes destabilization of androgen receptor and induces caspase-8 mediated-apoptosis in prostate cancer. Oncotarget 2018; 7:84201-84213. [PMID: 27705939 PMCID: PMC5356655 DOI: 10.18632/oncotarget.12393] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 09/25/2016] [Indexed: 12/17/2022] Open
Abstract
BIRM is an anticancer herbal formulation from Ecuador. Previous study established its antitumor and antimetastatic activity against prostate cancer models. The activity of BIRM against human prostate cancer (PCa) cells was investigated to uncover its mechanism of antitumor activity. In androgen receptor (AR)-expressing PCa cells BIRM was 2.5-fold (250%) more cytotoxic in presence of androgen (DHT) compared to cells grown in the absence of DHT. In AR-positive cells (LAPC-4 and LNCaP) BIRM caused a dose and time-dependent down-regulation of AR and increased apoptosis. Exposing cells to BIRM did not affect the synthesis of AR and AR promoter activity but increased degradation of AR via proteasome-pathway. BIRM caused destabilization of HSP90-AR association in LAPC-4 cells. It induced apoptosis in PCa cells by activation of caspase-8 via death receptor and FADD-mediated pathways. A synthetic inhibitor of Caspase-8 cleavage (IETD-CHO) aborted BIRM-induced apoptosis. The effect of BIRM on AKT-mediated survival pathway in both AR+ and AR- negative (PC-3 and DU145) showed decreased levels of p-AKTser 473 in all PCa cell lines. BIRM dosed by oral gavage in mice bearing PC-3ML tumors showed selective efficacy on tumor growth; before tumors are established but limited efficacy when treated on existing tumors. Moreover, BIRM inhibited the LNCaP tumor generated by orthotropic implantation into dorsal prostate of nude mice. Partial purification of BIRM by liquid-liquid extraction and further fractionation by HPLC showed 4-fold increased specific activity on PCa cells. These results demonstrate a mechanistic basis of anti-tumor activity of the herbal extract BIRM.
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Affiliation(s)
- Nagarajarao Shamaladevi
- Departments of Urology and Sylvester Cancer Center, Miller School of Medicine, University of Miami, Miami FL, USA
| | - Shinako Araki
- Departments of Urology and Sylvester Cancer Center, Miller School of Medicine, University of Miami, Miami FL, USA.,Okayama University Graduate School of Medicine, Okayama, Japan
| | - Dominic A Lyn
- Departments of Urology and Sylvester Cancer Center, Miller School of Medicine, University of Miami, Miami FL, USA
| | | | - Jie Gao
- Georgia Cancer Center and Department of Medicine, Augusta University, Augusta GA, USA
| | - Vinata B Lokeshwar
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta GA, USA
| | - Hugo Navarrete
- Herbarium QCA, Pontificia Universidad Catolica del-Ecuador, Quito, Ecuador
| | - Bal L Lokeshwar
- Georgia Cancer Center and Department of Medicine, Augusta University, Augusta GA, USA
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Lan D, Xu N, Sun J, Li Z, Liao R, Zhang H, Liang X, Yi W. Electroacupuncture mitigates endothelial dysfunction via effects on the PI3K/Akt signalling pathway in high fat diet-induced insulin-resistant rats. Acupunct Med 2018; 36:162-169. [PMID: 29502072 DOI: 10.1136/acupmed-2016-011253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/22/2017] [Indexed: 01/06/2023]
Abstract
OBJECTIVE To investigate the effect of electroacupuncture (EA) on endothelial dysfunction related to high fat diet (HFD)-induced insulin resistance through the phosphatidylinositol 3-kinase (PI3K)-protein kinase B (Akt) signalling pathway. METHODS Twenty-four male Sprague-Dawley rats were fed a regular diet (Control group, n=8) or a HFD (n=16) for 12 weeks to induce an insulin resistance model. HFD-fed rats were divided into two groups that remained untreated (HFD group, n=8) or received electroacupuncture (HFD+EA group, n=8). EA was applied at PC6, ST36, SP6 and BL23. At the end of the experiment, fasting blood glucose (FBG), serum insulin (FINS), serum C-peptide (C-P) and homeostatic model assessment of insulin resistance (HOMA-IR) indices were determined. Pancreatic islet samples were subjected to histopathological examination. The thoracic aorta was immunostained with anti-rat insulin receptor substrate (IRS)-1, Akt and endothelial nitric oxide synthase (eNOS) antibodies. mRNA and protein expression of IRS-1, PI3K, Akt2 and eNOS in the vascular endothelium were determined by real-time PCR and Western blot analysis, respectively. RESULTS The bodyweight increase of the HFD+EA group was smaller than that of the untreated HFD group. Compared with the HFD group, the levels of FBG, FINS, C-P and HOMA-IR in the HFD+EA group decreased significantly (P<0.01). Histopathological evaluation indicated that EA improved pancreatic islet inflammation. The expression of endothelial markers, such as IRS-1, PI3K, Akt2 and eNOS, decreased in the HFD group, while EA treatment appeared to ameliorate the negative impact of diet. CONCLUSION EA may improve insulin resistance and attenuate endothelial dysfunction, and therefore could play a potential role in the prevention or treatment of diabetic complications and cardiovascular disease through the PI3K/Akt signalling pathway.
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Affiliation(s)
- Danchun Lan
- Department of Acupuncture and Moxibustion, Foshan Hospital of TCM, Foshan, Guangdong, China
| | - Nenggui Xu
- Clinical Medical College of Acupuncture and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jian Sun
- Department of Acupuncture and Moxibustion, Guangdong Provincial Hospital of TCM, Guangzhou, China
| | - Zhixing Li
- Department of Soft Tissue Traumatology, Shenzhen Hospital of Chinese Medicine, Shenzhen, China
| | - Rongzhen Liao
- Department of Orthopedics, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Hongtao Zhang
- Clinical Medical College of Acupuncture and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaoli Liang
- Clinical Medical College of Acupuncture and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Wei Yi
- Clinical Medical College of Acupuncture and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China
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Wang J, Li XM, Bai Z, Chi BX, Wei Y, Chen X. Curcumol induces cell cycle arrest in colon cancer cells via reactive oxygen species and Akt/ GSK3β/cyclin D1 pathway. JOURNAL OF ETHNOPHARMACOLOGY 2018; 210:1-9. [PMID: 28684297 DOI: 10.1016/j.jep.2017.06.037] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 02/10/2017] [Accepted: 06/10/2017] [Indexed: 06/07/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Curcuma kwangsiensis S. G. Lee & C. F. Liang (Guangxi ezhu, in Chinese) belongs to the Zingiberaceae family, has been used as a traditionally Chinese medicine nearly 2000 year. Curcumol is one of the guaiane-type sesquiterpenoid hemiketal isolated from medicine plant Curcuma kwangsiensis S. G. Lee & C. F. Liang, which has been reported possesses anti-cancer effects. Our previous study found that the most contribution to inhibit nasopharyngeal carcinoma cell growth was curcumol. AIM OF THE STUDY To assess the effect of curcumol on cell cycle arrest against human colon cancer cells (CRC) cells (LoVo and SW480) and explore its mechanism in vitro and in vivo. MATERIALS AND METHODS Curcumol was dissolved in absolute ethyl alcohol. The concentration of absolute ethyl alcohol in the control group or in experimental samples was always 1/500 (v/v) of the final medium volume. LoVo and SW480 cells were treated with different concentrations of curcumol (0, 53, 106, 212 and 424μM). And then the cell cycle of each group was examined by flow cytometry. The protein levels of PI3K, p-Akt, cyclin D1, cyclin E, CDK2, CDK4 and GSK3β were determined by Western blot. The mRNA expression of PI3K, Akt, cyclin D1, CDK4, P27, p21, and P16 in the treated cells were analyzed by real-time RT-PCR. In addition, the antitumor activity of curcumol was evaluated in nude mice bearing orthotopic tumor implants. RESULTS Curcumol induced cell cycle arrest in G1/S phase. RT-qPCR and Western blot data showed that curcumol enhanced the expression of GSK3β, P27, p21 and P16, and decreased the levels of PI3K, phosphorylated Akt (p-Akt), cyclin D1, CDK4, cyclin E and CDK2. Furthermore, curcumol induced reactive oxygen species (ROS) generation in LoVo cells, and ROS scavenger N-acetylcysteine (NAC) significantly reversed curcumol-induced cell growth inhibition. Besides, curcumol also prevented the growth of human colon cancer cells xenografts in nude mouse, accompanied by the reduction of PI3K, Akt, cyclin D1, CDK4, cycln E and significant increase of GSK3β. CONCLUSIONS Curcumol caused cell cycle arrest at the G0/G1 phase by ROS production and Akt/ GSK3β/cyclin D1 pathways inactivation, indicating the potential of curcumol in the prevention of colon cancer carcinogenesis.
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Affiliation(s)
- Juan Wang
- Xiangya Hospital Central South University, Chang sha 410008, China; College of Pharmacy, Guilin Medical University, Guilin 541004, China
| | - Xu-Mei Li
- College of Pharmacy, Guilin Medical University, Guilin 541004, China
| | - Zhun Bai
- Intensive Care Unit, Zhuzhou Central Hospital, Zhuzhou 412007, China
| | - Bi-Xia Chi
- Digestive System Department, The Frist People's Hospital of YueYang, Yueyang 414000, China
| | - Yan Wei
- College of Pharmacy, Guilin Medical University, Guilin 541004, China
| | - Xu Chen
- College of Pharmacy, Guilin Medical University, Guilin 541004, China.
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Ding H, Mei Q, Gan HZ, Cao LY, Liu XC, Xu JM. Effect of homocysteine on intestinal permeability in rats with experimental colitis, and its mechanism. Gastroenterol Rep (Oxf) 2014; 2:215-20. [PMID: 24787389 PMCID: PMC4124268 DOI: 10.1093/gastro/gou022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVE To investigate the effect of homocysteine (Hcy) on intestinal permeability in rats with TNBS/ethanol-induced colitis and elucidate its mechanism. METHODS Sprague-Dawley rats were divided into four groups: normal, normal + Hcy injection, TNBS model, and TNBS model + Hcy injection. Experimental colitis was induced by trinitrobenzene sulfonic acid (TNBS) in 50% ethanol; rats were injected subcutaneously with Hcy from the first day after the induction of experimental colitis on 30 consecutive days. To determine the severity of colitis, the disease activity index (DAI) was evaluated; colon tissues were collected for the detection of the activity of myeloperoxidase (MPO) and the contents of MDA, IL-1β, IL-6, TNF-α, MMP-2, and MMP-9. Intestinal epithelial permeability was assessed with Evans blue (EB) dye. The levels of Hcy in plasma and colon mucosa were measured by high-performance liquid chromatography-fluorescence detection (HPLC-FD). RESULTS Compared with the normal group, the DAI scoring and MPO activity, contents of MDA, IL-1β, IL-6, TNF-α, MMP-2, MMP-9 in the colon and EB in the small intestine were significantly increased in the TNBS group (P < 0.01). Compared with the TNBS model group, the DAI scoring, plasma and colonic mucosa Hcy levels, MPO activity and contents of MDA, IL-1β, IL-6, TNF-α, MMP-2, MMP-9 in colon and EB in small intestine were significantly increased in the TNBS-induced colitis rats with simultaneous Hcy injection (P < 0.01). CONCLUSION Hcy can increase intestinal permeability and aggravate inflammatory damage in rats with TNBS-induced colitis, the underlying mechanisms of which may be attributed to its effects of promoting the expression of MMP-2 and MMP-9, leading to injury of the intestinal barrier.
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Affiliation(s)
- Hao Ding
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Qiao Mei
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Hui-Zhong Gan
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Li-Yu Cao
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Xiao-Chang Liu
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jian-Ming Xu
- Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University and The Key Laboratory of Digestive Diseases of Anhui Province, Hefei, China Department of Pathology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
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Kim S, Lee JC, Cho ES, Kwon J. COMP-Ang1 promotes chondrogenic and osteogenic differentiation of multipotent mesenchymal stem cells through the Ang1/Tie2 signaling pathway. J Orthop Res 2013; 31:1920-8. [PMID: 23893855 DOI: 10.1002/jor.22453] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Accepted: 07/01/2013] [Indexed: 02/04/2023]
Abstract
Mesenchymal stem cells (MSCs) are pleiotrophic cells that differentiate to chondrocytes, osteoblasts, or adipocytes, as a result of crosstalk by specific signaling pathways including MAPK pathway. Recently cartilage oligomeric matrix protein angiopoietin1 (COMP-Ang1), an Ang1 variant which is more potent than native Ang1 in phosphorylating Tie2 receptor was developed. The Ang1/Tie2 signaling system not only plays a pivotal role in vessel growth, remodeling, and maturation, but also protective and recruit effect on MSCs. Thus, the aim of the present study was to investigate the differentiate effect of Ang1/Tie2 signaling on MSCs in the presence of chondrogenic, osteogenic and adipogenic induction medium, and to determine the possible mechanisms. Our results clearly demonstrated that MSCs cultured in each induction medium with COMP-Ang1 revealed strongly chondrogenic and osteogenic morphological change (3.5- and 2-fold, respectively) as well as up-regulate each gene, except for adipogenic differentiation. Accordingly, we found that phosphorylation of Tie2 expression lead to phosphorylation of p38 and AKT and then accelerating each differentiation of MSCs to chondrocytes and osteoblasts. Therefore, our findings suggest that COMP-Ang1 present a portal to promote MSCs differentiation to chondrocytes and osteoblasts through Ang1/Tie2 signaling pathway and provide insights into novel therapies for bone diseases.
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Affiliation(s)
- Sokho Kim
- Department of Laboratory Animal Medicine, College of Veterinary Medicine, Jeonju, 561-156, Republic of Korea
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Methyl donor deficiency affects small-intestinal differentiation and barrier function in rats. Br J Nutr 2012; 109:667-77. [DOI: 10.1017/s0007114512001869] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Dietary methyl donors and their genetic determinants are associated with Crohn's disease risk. We investigated whether a methyl-deficient diet (MDD) may affect development and functions of the small intestine in rat pups from dams subjected to the MDD during gestation and lactation. At 1 month before pregnancy, adult females were fed with either a standard food or a diet without vitamin B12, folate and choline. A global wall hypotrophy was observed in the distal small bowel (MDD animals 0·30 mm v. controls 0·58 mm; P< 0·001) with increased crypt apoptosis (3·37 v. 0·4 %; P< 0·001), loss of enterocyte differentiation in the villus and a reduction in intestinal alkaline phosphatase production. Cleaved caspase-3 immunostaining (MDD animals 3·37 % v. controls 0·4 %, P< 0·001) and the Apostain labelling index showed increased crypt apoptosis (3·5 v. 1·4 %; P= 0·018). Decreased proliferation was observed in crypts of the proximal small bowel with a reduced number of minichromosome maintenance 6 (MDD animals 52·83 % v. controls 83·17 %; P= 0·048) and proliferating cell nuclear antigen-positive cells (46·25 v. 59 %; P= 0·05). This lack of enterocyte differentiation in the distal small bowel was associated with an impaired expression of β-catenin and a decreased β-catenin–E-cadherin interaction. The MDD affected the intestinal barrier in the proximal small bowel by decreasing Paneth cell number after immunostaining for lysosyme (MDD animals 8·66 % v. controls 21·66 %) and by reducing goblet cell number and mucus production after immunostaining for mucin-2 (crypts 8·66 v. 15·33 %; villus 7 v. 17 %). The MDD has dual effects on the small intestine by producing dramatic effects on enterocyte differentiation and barrier function in rats.
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Hyperhomocysteinemia selectively alters expression and stoichiometry of intermediate filament and induces glutamate‐ and calcium‐mediated mechanisms in rat brain during development. Int J Dev Neurosci 2009; 28:21-30. [DOI: 10.1016/j.ijdevneu.2009.10.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Accepted: 10/02/2009] [Indexed: 01/17/2023] Open
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Yang XF, Fang P, Meng S, Jan M, Xiong X, Yin Y, Wang H. The FOX transcription factors regulate vascular pathology, diabetes and Tregs. Front Biosci (Schol Ed) 2009; 1:420-36. [PMID: 19482711 DOI: 10.2741/s35] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A small number of upstream master genes in "higher hierarchy" controls the expression of a large number of downstream genes and integrates the signaling pathways underlying the pathogenesis of cardiovascular diseases with or without autoimmune inflammatory mechanisms. In this brief review, we organize our analysis of recent progress in characterization of forkhead (FOX) transcription factor family members in vascular pathology, diabetes and regulatory T cells into the following sections: (1) Overview of the FOX transcription factor superfamily; (2) Vascular pathology of mice deficient in FOX transcription factors; (3) Roles of FOX transcription factors in endothelial cell pathology; (4) Roles of FOX transcription factors in vascular smooth muscle cells; (5) Roles of FOX transcription factors in the pathogenesis of diabetes; and (6) Immune system phenotypes of mice deficient in FOX transcription factors. Advances in these areas suggest that the FOX transcription factor family plays important roles in vascular development and in the pathogenesis of autoimmune inflammatory cardiovascular diseases.
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Affiliation(s)
- Xiao-Feng Yang
- Department of Pharmacology and Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA 19140, USA.
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Hamelet J, Noll C, Ripoll C, Paul JL, Janel N, Delabar JM. Effect of hyperhomocysteinemia on the protein kinase DYRK1A in liver of mice. Biochem Biophys Res Commun 2009; 378:673-7. [PMID: 19059382 DOI: 10.1016/j.bbrc.2008.11.126] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2008] [Accepted: 11/25/2008] [Indexed: 10/21/2022]
Abstract
Hyperhomocysteinemia due to cystathionine beta synthase (CBS)-deficiency confers diverse clinical manifestations, notably liver diseases. Even if hyperhomocysteinemia in liver of CBS-deficient mice, a murine model of hyperhomocysteinemia, promotes mitochondrial oxidative stress and pro-apoptotic signals, protective signals may counteract these pro-apoptotic signals, leading to chronic inflammation. As DYRK1A, a serine/threonine kinase, has been described as a candidate antiapoptotic factor, we have analyzed the expression of DYRK1A in liver of CBS-deficient mice. We found that DYRK1A protein level was reduced in liver of CBS-deficient mice, which was not observed at the gene expression level. Moreover, the use of primary hepatocytes/Kupffer cells co-culture showed that degradation of DYRK1A induced by hyperhomocysteinemia requires calpain activation. Our results demonstrate a deleterious effect of hyperhomocysteinemia on DYRK1A protein expression, and emphasize the role of hyperhomocysteinemia on calpain activation.
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Affiliation(s)
- Julien Hamelet
- EA 3508 - case 7104, Univ Paris Diderot, 75205 Paris cedex 13, France
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The forkhead transcription factors play important roles in vascular pathology and immunology. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 665:90-105. [PMID: 20429418 DOI: 10.1007/978-1-4419-1599-3_7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Transcription factor families are a small number of upstream master genes in "higher hierarchy" that control the expression of a large number of downstream genes. These transcription factors have been found to integrate the signaling pathways underlying the pathogenesis of cardiovascular diseases with or without autoimmune inflammatory mechanisms. In this chapter, we organize our analysis of recent progress in characterization of forkhead (Fox) transcription factor family members in vascular pathology and immune regulation into the following sections: (1) Introduction of the FOX transcription factor superfamily; (2) FOX transcription factors and endotheial cell pathology; (3) FOX transcription factors and vascular smooth muscle cells; and (4) FOX transcription factors, inflammation and immune system. Advances in these areas suggest that the FOX transcription factor family is important in regulating vascular development and the pathogenesis of autoimmune inflammatory cardiovascular diseases.
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Moshal KS, Zeldin DC, Sithu SD, Sen U, Tyagi N, Kumar M, Hughes WM, Metreveli N, Rosenberger DSE, Singh M, Vacek TP, Rodriguez WE, Ayotunde A, Tyagi SC. Cytochrome P450 (CYP) 2J2 gene transfection attenuates MMP-9 via inhibition of NF-kappabeta in hyperhomocysteinemia. J Cell Physiol 2008; 215:771-81. [PMID: 18181170 DOI: 10.1002/jcp.21356] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Hyperhomocysteinemia (HHcy) is associated with atherosclerotic events involving the modulation of arachidonic acid (AA) metabolism and the activation of matrix metalloproteinase-9 (MMP-9). Cytochrome P450 (CYP) epoxygenase-2J2 (CYP2J2) is abundant in the heart endothelium, and its AA metabolites epoxyeicosatrienoic acids (EETs) mitigates inflammation through NF-kappabeta. However, the underlying molecular mechanisms for MMP-9 regulation by CYP2J2 in HHcy remain obscure. We sought to determine the molecular mechanisms by which P450 epoxygenase gene transfection or EETs supplementation attenuate homocysteine (Hcy)-induced MMP-9 activation. CYP2J2 was over-expressed in mouse aortic endothelial cells (MAECs) by transfection with the pcDNA3.1/CYP2J2 vector. The effects of P450 epoxygenase transfection or exogenous supplementation of EETs on NF-kappabeta-mediated MMP-9 regulation were evaluated using Western blot, in-gel gelatin zymography, electromobility shift assay, immunocytochemistry. The result suggested that Hcy downregulated CYP2J2 protein expression and dephosphorylated PI3K-dependent AKT signal. Hcy induced the nuclear translocation of NF-kappabeta via downregulation of IKbetaalpha (endogenous cytoplasmic inhibitor of NF-kappabeta). Hcy induced MMP-9 activation by increasing NF-kappabeta-DNA binding. Moreover, P450 epoxygenase transfection or exogenous addition of 8,9-EET phosphorylated the AKT and attenuated Hcy-induced MMP-9 activation. This occurred, in part, by the inhibition of NF-kappabeta nuclear translocation, NF-kappabeta-DNA binding and activation of IKbetaalpha. The study unequivocally suggested the pivotal role of EETs in the modulation of Hcy/MMP-9 signal.
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Affiliation(s)
- Karni S Moshal
- Department of Physiology and Biophysics, School of Medicine University of Louisville, Louisville, Kentucky 40202, USA
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Carter CJ. Multiple genes and factors associated with bipolar disorder converge on growth factor and stress activated kinase pathways controlling translation initiation: implications for oligodendrocyte viability. Neurochem Int 2007; 50:461-90. [PMID: 17239488 DOI: 10.1016/j.neuint.2006.11.009] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Accepted: 11/27/2006] [Indexed: 02/06/2023]
Abstract
Famine and viral infection, as well as interferon therapy have been reported to increase the risk of developing bipolar disorder. In addition, almost 100 polymorphic genes have been associated with this disease. Several form most of the components of a phosphatidyl-inositol signalling/AKT1 survival pathway (PIK3C3, PIP5K2A, PLCG1, SYNJ1, IMPA2, AKT1, GSK3B, TCF4) which is activated by growth factors (BDNF, NRG1) and also by NMDA receptors (GRIN1, GRIN2A, GRIN2B). Various other protein products of genes associated with bipolar disorder either bind to or are affected by phosphatidyl-inositol phosphate products of this pathway (ADBRK2, HIP1R, KCNQ2, RGS4, WFS1), are associated with its constituent elements (BCR, DUSP6, FAT, GNAZ) or are downstream targets of this signalling cascade (DPYSL2, DRD3, GAD1, G6PD, GCH1, KCNQ2, NOS3, SLC6A3, SLC6A4, SST, TH, TIMELESS). A further pathway relates to endoplasmic reticulum-stress (HSPA5, XBP1), caused by problems in protein glycosylation (ALG9), growth factor receptor sorting (PIK3C3, HIP1R, SYBL1), or aberrant calcium homoeostasis (WFS1). Key processes relating to these pathways appear to be under circadian control (ARNTL, CLOCK, PER3, TIMELESS). DISC1 can also be linked to many of these pathways. The growth factor pathway promotes protein synthesis, while the endoplasmic reticulum stress pathway, and other stress pathways activated by viruses and cytokines (IL1B, TNF, Interferons), oxidative stress or starvation, all factors associated with bipolar disorder risk, shuts down protein synthesis via control of the EIF2 alpha and beta translation initiation complex. For unknown reasons, oligodendrocytes appear to be particularly prone to defects in the translation initiation complex (EIF2B) and the convergence of these environmental and genomic signalling pathways on this area might well explain their vulnerability in bipolar disorder.
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Shah DI, Singh M. Possible role of Akt to improve vascular endothelial dysfunction in diabetic and hyperhomocysteinemic rats. Mol Cell Biochem 2006; 295:65-74. [PMID: 16841179 DOI: 10.1007/s11010-006-9273-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2006] [Accepted: 06/26/2006] [Indexed: 10/24/2022]
Abstract
The study has been designed to investigate the effect of demethylasterroquinone B1 (DAQ B1), an activator of Akt, in diabetes mellitus (DM) and hyperhomocysteinemia (HHcy)-induced vascular endothelial dysfunction. Streptozotocin (55 mg kg(-1), i.v.) and methionine (1.7% w/w, p.o., 4 weeks) were administered to rats to produce DM (serum glucose >140 mg dl(-1)) and HHcy (serum homocysteine >10 microM), respectively. Vascular endothelial dysfunction was assessed using isolated aortic ring preparation, electron microscopy of thoracic aorta and serum concentration of nitrite/nitrate. The expression of messenger RNA for p22phox and eNOS was assessed by reverse transcription-polymerase chain reaction. Serum thiobarbituric acid reactive substances (TBARS) and aortic superoxide anion were estimated to assess oxidative stress. DAQ B1 (5 mg kg(-1), p.o.) or atorvastatin (30 mg kg(-1), p.o.) in diabetic and hyperhomocysteinemic rats significantly reduced serum glucose and homocysteine concentration. DAQ B1 or atorvastatin markedly improved acetylcholine-induced endothelium-dependent relaxation, vascular endothelial lining, serum nitrite/nitrate concentration and serum TBARS in diabetic and hyperhomocysteinemic rats. However, this ameliorative effect of DAQ B1 has been prevented by L-NAME (25 mg kg(-1), i.p.), an inhibitor of eNOS. Therefore, it may be concluded that DAQ B1-induced activation of Akt may activate eNOS and consequently reduce oxidative stress to improve vascular endothelial dysfunction.
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MESH Headings
- Acetylcholine/pharmacology
- Animals
- Aorta/drug effects
- Aorta/enzymology
- Aorta/ultrastructure
- Blood Glucose/metabolism
- Diabetes Mellitus, Experimental/chemically induced
- Diabetes Mellitus, Experimental/enzymology
- Diabetes Mellitus, Experimental/physiopathology
- Endothelium, Vascular/enzymology
- Endothelium, Vascular/physiopathology
- Endothelium, Vascular/ultrastructure
- Gene Expression Regulation, Enzymologic/drug effects
- Homocysteine/blood
- Hyperhomocysteinemia/chemically induced
- Hyperhomocysteinemia/enzymology
- Hyperhomocysteinemia/physiopathology
- Male
- NADPH Oxidases/genetics
- NADPH Oxidases/metabolism
- Nitrates/blood
- Nitric Oxide Synthase Type III/genetics
- Nitric Oxide Synthase Type III/metabolism
- Nitrites/blood
- Proto-Oncogene Proteins c-akt/agonists
- Proto-Oncogene Proteins c-akt/metabolism
- Quinones/pharmacology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Superoxides/metabolism
- Thiobarbituric Acid Reactive Substances/analysis
- Vasodilation/drug effects
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Affiliation(s)
- Dhvanit I Shah
- Department of Pharmaceutical Sciences & Drug Research, Faculty of Medicine, Punjabi University, Patiala, 147002
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Yanagihara M, Sasaki-Takahashi N, Sugahara T, Yamamoto S, Shinomi M, Yamashita I, Hayashida M, Yamanoha B, Numata A, Yamori T, Andoh T. Leptosins isolated from marine fungus Leptoshaeria species inhibit DNA topoisomerases I and/or II and induce apoptosis by inactivation of Akt/protein kinase B. Cancer Sci 2005; 96:816-24. [PMID: 16271076 PMCID: PMC11159085 DOI: 10.1111/j.1349-7006.2005.00117.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
DNA topoisomerases (topo) I and II are molecular targets of several potent anticancer agents. Thus, inhibitors of these enzymes are potential candidates or model compounds for anticancer drugs. Leptosins (Leps) F and C, indole derivatives, were isolated from a marine fungus, Leptoshaeria sp. as cytotoxic substances. In vitro cytotoxic effects of Lep were measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide-based viability assay. Lep F inhibited the activity of topos I and II, whereas Lep C inhibited topo I in vitro. Interestingly both of the compounds were found to be catalytic inhibitors of topo I, as evidenced by the lack of stabilization of reaction intermediate cleavable complex (CC), as camptothecin (CPT) does stabilize. Furthermore, Lep C inhibited the CC stabilization induced by CPT in vitro. In vivo band depletion analysis demonstrated that Lep C likewise appeared not to stabilize CC, and inhibited CC formation by CPT, indicating that Lep C is also a catalytic inhibitor of topo I in vivo. Cell cycle analysis of Lep C-treated cells showed that Lep C appeared to inhibit the progress of cells from G(1) to S phase. Lep C induced apoptosis in RPMI8402 cells, as revealed by the accumulation of cells in sub-G(1) phase, activation of caspase-3 and the nucleosomal degradation of chromosomal DNA. Furthermore, Leps F and C inhibited the Akt pathway, as demonstrated by dose-dependent and time-dependent dephosphorylation of Akt (Ser473). Our study shows that Leps are a group of anticancer chemotherapeutic agents with single or dual catalytic inhibitory activities against topos I and II.
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Affiliation(s)
- Miyako Yanagihara
- Department of Bioinformatics, Soka University, Hachioji, Tokyo, Japan
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