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Wei R, Han C, He F, Xiong X, Ye F, Liu H, Li L, Xu H, Wei S, Zeng X. Role of forkhead box protein O1 and insulin on cell proliferation mediated by sirtuin 1 in goose primary hepatocytes. J APPL POULTRY RES 2021. [DOI: 10.1016/j.japr.2021.100144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Correia M, Perestrelo T, Rodrigues AS, Ribeiro MF, Pereira SL, Sousa MI, Ramalho-Santos J. Sirtuins in metabolism, stemness and differentiation. Biochim Biophys Acta Gen Subj 2017; 1861:3444-3455. [DOI: 10.1016/j.bbagen.2016.09.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 08/16/2016] [Accepted: 09/06/2016] [Indexed: 12/20/2022]
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3
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Multiple Integrated Complementary Healing Approaches: Energetics & Light for bone. Med Hypotheses 2016; 86:18-29. [DOI: 10.1016/j.mehy.2015.10.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 10/30/2015] [Indexed: 02/08/2023]
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Upregulation of long non-coding RNA HIF 1α-anti-sense 1 induced by transforming growth factor-β-mediated targeting of sirtuin 1 promotes osteoblastic differentiation of human bone marrow stromal cells. Mol Med Rep 2015; 12:7233-8. [PMID: 26460121 PMCID: PMC4626181 DOI: 10.3892/mmr.2015.4415] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 07/21/2015] [Indexed: 12/02/2022] Open
Abstract
The present study aimed to investigate the regulatory mechanism of long non-coding RNA hypoxia-inducible factor 1α-anti-sense 1 (lncRNA HIF1α-AS1) in osteoblast differentiation as well as its targeting by sirtuin 1 (SIRT1), which may be inhibited by transforming growth factor (TGF)-β in bone marrow stromal cells (BMSCs). Real-time polymerase chain reaction (PCR), western blot analysis, lncRNA PCR arrays and chromatin immunoprecipitation were performed in order to examine the interference of SIRT1 expression by TGF-β, the effects of SIRT1 overexpression on lncRNA HIF1α-AS1 and the regulation of the expression of homeobox (HOX)D10, which promotes BMSC differentiation, by lncRNA HIF1α-AS1. The results showed that TGF-β interfered with SIRT1 expression. Furthermore, lncRNA HIF1α-AS1 was significantly downregulated following overexpression of SIRT1. In addition, low expression of HIF1α-AS1 was sufficient to block the expression of HOXD10. The present study further demonstrated that downregulation of HOXD10 by HIF1α-AS1 interfered with acetylation, and subsequently resulted in the inhibition of osteoblast differentiation. These results suggested that HIF1α-AS1 is an essential mediator of osteoblast differentiation, and may thus represent a gene-therapeutic agent for the treatment of human bone diseases.
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Boeckx C, Benítez-Burraco A. Osteogenesis and neurogenesis: a robust link also for language evolution. Front Cell Neurosci 2015; 9:291. [PMID: 26283924 PMCID: PMC4516893 DOI: 10.3389/fncel.2015.00291] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 07/15/2015] [Indexed: 12/30/2022] Open
Affiliation(s)
- Cedric Boeckx
- Catalan Institute for Advanced Studies and Research Barcelona, Spain ; Linguistics, Universitat de Barcelona Barcelona, Spain
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Benítez-Burraco A, Boeckx C. Possible functional links among brain- and skull-related genes selected in modern humans. Front Psychol 2015; 6:794. [PMID: 26136701 PMCID: PMC4468360 DOI: 10.3389/fpsyg.2015.00794] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 05/26/2015] [Indexed: 12/12/2022] Open
Abstract
The sequencing of the genomes from extinct hominins has revealed that changes in some brain-related genes have been selected after the split between anatomically-modern humans and Neanderthals/Denisovans. To date, no coherent view of these changes has been provided. Following a line of research we initiated in Boeckx and Benítez-Burraco (2014a), we hypothesize functional links among most of these genes and their products, based on the existing literature for each of the gene discussed. The genes we focus on are found mutated in different cognitive disorders affecting modern populations and their products are involved in skull and brain morphology, and neural connectivity. If our hypothesis turns out to be on the right track, it means that the changes affecting most of these proteins resulted in a more globular brain and ultimately brought about modern cognition, with its characteristic generativity and capacity to form and exploit cross-modular concepts, properties most clearly manifested in language.
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Affiliation(s)
| | - Cedric Boeckx
- Catalan Institute for Research and Advanced Studies , Barcelona, Spain ; Department of Linguistics, Universitat de Barcelona , Barcelona, Spain
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LI ZHOUBIN, MARGARITI ANDRIANA, WU YUTAO, YANG FENG, HU JIAN, ZHANG LI, CHEN TING. MicroRNA-199a induces differentiation of induced pluripotent stem cells into endothelial cells by targeting sirtuin 1. Mol Med Rep 2015; 12:3711-3717. [DOI: 10.3892/mmr.2015.3845] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 04/30/2015] [Indexed: 11/06/2022] Open
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Patel DK, Rana D, Aswal VK, Srivastava S, Roy P, Maiti P. Influence of graphene on self-assembly of polyurethane and evaluation of its biomedical properties. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.03.076] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Li Y, Yu C, Shen G, Li G, Shen J, Xu Y, Gong J. Sirt3-MnSOD axis represses nicotine-induced mitochondrial oxidative stress and mtDNA damage in osteoblasts. Acta Biochim Biophys Sin (Shanghai) 2015; 47:306-12. [PMID: 25757953 DOI: 10.1093/abbs/gmv013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Increasing evidence has suggested an important role played by reactive oxygen species in the pathogenesis of osteoporosis. Tobacco smoking is an important risk factor for the development of osteoporosis, and nicotine is one of the major components in tobacco. However, the mechanism by which nicotine promotes osteoporosis is not fully understood. Here, in this study, we found that nicotine-induced mitochondrial oxidative stress and mitochondrial DNA (mtDNA) damage in osteoblasts differentiated from mouse mesenchymal stem cell. The activity of MnSOD, one of the mitochondrial anti-oxidative enzymes, was significantly reduced by nicotine due to the reduced level of Sirt3. Moreover, it was also found that Sirt3 could promote MnSOD activity by deacetylating MnSOD. Finally, Mn(III)tetrakis (4-benzoic acid) porphyrin (MnTBAP, a MnSOD mimetic) was found to markedly reduce the effect of nicotine on osteoblasts. In summary, Sirt3-MnSOD axis was identified as a negative component in nicotine-induced mitochondrial oxidative stress and mtDNA damage, and MnTBAP may serve as a potential therapeutic drug for osteoporosis.
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Affiliation(s)
- Yong Li
- Department of Radiology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Chen Yu
- Department of Orthopaedics, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Guangsi Shen
- Department of Orthopaedics, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Guangfei Li
- Department of Orthopaedics, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Junkang Shen
- Department of Radiology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Youjia Xu
- Department of Orthopaedics, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - Jianping Gong
- Department of Radiology, The Second Affiliated Hospital of Soochow University, Suzhou 215004, China
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Benítez-Burraco A. Biological noise and H2A.Z: a promising connection for language. Front Genet 2015; 5:463. [PMID: 25620980 PMCID: PMC4288338 DOI: 10.3389/fgene.2014.00463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 12/16/2014] [Indexed: 01/25/2023] Open
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Yu X, Zhang L, Wen G, Zhao H, Luong LA, Chen Q, Huang Y, Zhu J, Ye S, Xu Q, Wang W, Xiao Q. Upregulated sirtuin 1 by miRNA-34a is required for smooth muscle cell differentiation from pluripotent stem cells. Cell Death Differ 2014; 22:1170-80. [PMID: 25526086 DOI: 10.1038/cdd.2014.206] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 11/05/2014] [Accepted: 11/06/2014] [Indexed: 12/31/2022] Open
Abstract
microRNA-34a (miR-34a) and sirtuin 1 (SirT1) have been extensively studied in tumour biology and longevity/aging, but little is known about their functional roles in smooth muscle cell (SMC) differentiation from pluripotent stem cells. Using well-established SMC differentiation models, we have demonstrated that miR-34a has an important role in SMC differentiation from murine and human embryonic stem cells. Surprisingly, deacetylase sirtuin 1 (SirT1), one of the top predicted targets, was positively regulated by miR-34a during SMC differentiation. Mechanistically, we demonstrated that miR-34a promoted differentiating stem cells' arrest at G0/G1 phase and observed a significantly decreased incorporation of miR-34a and SirT1 RNA into Ago2-RISC complex upon SMC differentiation. Importantly, we have identified SirT1 as a transcriptional activator in the regulation of SMC gene programme. Finally, our data showed that SirT1 modulated the enrichment of H3K9 tri-methylation around the SMC gene-promoter regions. Taken together, our data reveal a specific regulatory pathway that miR-34a positively regulates its target gene SirT1 in a cellular context-dependent and sequence-specific manner and suggest a functional role for this pathway in SMC differentiation from stem cells in vitro and in vivo.
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Affiliation(s)
- X Yu
- 1] Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK [2] Institute of Bioengineering, Queen Mary University of London, London E1 4NS, UK
| | - L Zhang
- Department of Cardiology, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, Zhejiang 310003, China
| | - G Wen
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - H Zhao
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - L A Luong
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - Q Chen
- 1] Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK [2] Department of Cardiology, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, Zhejiang 310003, China
| | - Y Huang
- 1] Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK [2] Department of Cardiology, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, Zhejiang 310003, China
| | - J Zhu
- Department of Cardiology, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, Zhejiang 310003, China
| | - S Ye
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - Q Xu
- Cardiovascular Division, King's College London British Heart Foundation Centre, London SE5 9NU, UK
| | - W Wang
- Institute of Bioengineering, Queen Mary University of London, London E1 4NS, UK
| | - Q Xiao
- Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
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Srivastava S, Sharma K, Kumar N, Roy P. Bradykinin regulates osteoblast differentiation by Akt/ERK/NFκB signaling axis. J Cell Physiol 2014; 229:2088-105. [PMID: 24825463 DOI: 10.1002/jcp.24668] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 05/09/2014] [Indexed: 12/11/2022]
Abstract
Bradykinin (BK), a well known mediator of pain and inflammation, is also known to be involved in the process of bone resorption. The present study therefore evaluated the role of BK in osteoblast lineage commitment. Our data showed that BK inhibits the migration of bone marrow mesenchymal stem cells, but does not affect their viability. Moreover, BK also inhibits osteoblastic differentiation by significantly downregulating the levels of mRNAs for osteopontin, runX2, col24, osterix, osteocalcin genes and bone mineralization (P < 0.05). Further, BK was found to elicit the BK receptors (BDKR1 and BDKR2) mediated activation of ERK1/2 and Akt pathways, which finally led to the activation of NFκB. BK also promoted the osteoclast differentiation of bone marrow derived preosteoclast cells by upregulating the expression of c-fos, NFATC1, TRAP, clcn7, cathK, and OSCAR genes and increasing TRAP activity through NFκB pathway. In conclusion, our data suggest that BK decreases the differentiation of osteoblasts with concomitant increase in osteoclast formation and thus provides new insight into the mechanism of action of BK in modulating bone resorption.
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Affiliation(s)
- Swati Srivastava
- Molecular Endocrinology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
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Hajifathali A, Saba F, Atashi A, Soleimani M, Mortaz E, Rasekhi M. The role of catecholamines in mesenchymal stem cell fate. Cell Tissue Res 2014; 358:651-65. [PMID: 25173883 DOI: 10.1007/s00441-014-1984-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 07/28/2014] [Indexed: 01/22/2023]
Abstract
Mesenchymal stem cells (MSCs) are multipotent stem cells found in many adult tissues, especially bone marrow (BM) and are capable of differentiation into various lineage cells such as osteoblasts, adipocytes, chondrocytes and myocytes. Moreover, MSCs can be mobilized from connective tissue into circulation and from there to damaged sites to contribute to regeneration processes. MSCs commitment and differentiation are controlled by complex activities involving signal transduction through cytokines and catecholamines. There has been an increasing interest in recent years in the neural system, functioning in the support of stem cells like MSCs. Recent efforts have indicated that the catecholamine released from neural and not neural cells could be affected characteristics of MSCs. However, there have not been review studies of most aspects involved in catecholamines-mediated functions of MSCs. Thus, in this review paper, we will try to describe the current state of catecholamines in MSCs destination and discuss strategies being used for catecholamines for migration of these cells to damaged tissues. Then, the role of the nervous system in the induction of osteogenesis, adipogenesis, chondrogenesis and myogenesis from MSCs is discussed. Recent progress in studies of signaling transduction of catecholamines in determination of the final fate of MSCs is highlighted. Hence, the knowledge of interaction between MSCs with the neural system could be applied towards the development of new diagnostic and treatment alternatives for human diseases.
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Affiliation(s)
- Abbas Hajifathali
- Bone Marrow Transplantation Center, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Boeckx C, Benítez-Burraco A. The shape of the human language-ready brain. Front Psychol 2014; 5:282. [PMID: 24772099 PMCID: PMC3983487 DOI: 10.3389/fpsyg.2014.00282] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 03/17/2014] [Indexed: 12/14/2022] Open
Abstract
Our core hypothesis is that the emergence of our species-specific language-ready brain ought to be understood in light of the developmental changes expressed at the levels of brain morphology and neural connectivity that occurred in our species after the split from Neanderthals–Denisovans and that gave us a more globular braincase configuration. In addition to changes at the cortical level, we hypothesize that the anatomical shift that led to globularity also entailed significant changes at the subcortical level. We claim that the functional consequences of such changes must also be taken into account to gain a fuller understanding of our linguistic capacity. Here we focus on the thalamus, which we argue is central to language and human cognition, as it modulates fronto-parietal activity. With this new neurobiological perspective in place, we examine its possible molecular basis. We construct a candidate gene set whose members are involved in the development and connectivity of the thalamus, in the evolution of the human head, and are known to give rise to language-associated cognitive disorders. We submit that the new gene candidate set opens up new windows into our understanding of the genetic basis of our linguistic capacity. Thus, our hypothesis aims at generating new testing grounds concerning core aspects of language ontogeny and phylogeny.
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Affiliation(s)
- Cedric Boeckx
- Catalan Institute for Advanced Studies and Research (ICREA) Barcelona, Spain ; Department of Linguistics, Universitat de Barcelona Barcelona, Spain
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15
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Srivastava S, Kumar N, Roy P. Role of ERK/NFκB in vanadium (IV) oxide mediated osteoblast differentiation in C3H10t1/2 cells. Biochimie 2014; 101:132-44. [PMID: 24440756 DOI: 10.1016/j.biochi.2014.01.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 01/06/2014] [Indexed: 10/25/2022]
Abstract
Vanadium (V) compounds are reported to have insulin mimicking action, which render them to show excellent osteogenic activity. In the current study we investigated the effect of various vanadium compounds on osteoblast differentiation of mouse mesenchymal stem cells, C3H10t1/2 cells, and analyzed the underlying mechanism of vanadium for this action. Our data showed that treatment of C3H10t1/2 cells with V (IV) oxide complex (at 7-25 μM concentrations) induced osteoblast differentiation maximally as compared to V2O5. On the other hand, ammonium vanadate was found to dampen the osteoblast differentiation process. Based on this data, V (IV) oxide was investigated further to analyze its probable mode of action as an osteoblastic agent. The key factors implicated in osteoblast differentiation i.e., NFκB, ERK ½, AP1 and CRE were examined in response to V (IV) oxide exposure. Exposure to V (IV) oxide caused 2- and 5-folds induction of luciferase activities in cells transfected with SRE-luc and NFκB-luc reporter vectors respectively (p < 0.05). Further, exposure to V (IV) oxide enhanced the phosphorylation of ERK ½, IκB and NFκBp65 proteins. In addition, RT-PCR analysis, alizarin red staining and immunoblot analysis showed that inhibition of osteoblast differentiation in presence of PD98059 and parthenolide (inhibitors of ERK and NFκB pathways respectively) was rescued in presence of V (IV) oxide. These results suggest that V (IV) oxide up regulates osteoblast differentiation through ERK and NFκB pathways and hence could be utilized as an agent for bone formation after further analysis and validation.
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Affiliation(s)
- Swati Srivastava
- Molecular Endocrinology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, Uttarakhand, India
| | - Narender Kumar
- Molecular Endocrinology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, Uttarakhand, India
| | - Partha Roy
- Molecular Endocrinology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, Uttarakhand, India.
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Abstract
Small cell lung cancer (SCLC) accounts for nearly 15% of human lung cancers and is one of the most aggressive solid tumors. The SCLC cells are thought to derive from self-renewing pulmonary neuroendocrine cells by oncogenic transformation. However, whether the SCLC cells possess stemness and plasticity for differentiation as normal stem cells has not been well understood thus far. In this study, we investigated the expressions of multilineage stem cell markers in the cancer cells of SCLC cell line (NCI-H446) and analyzed their clonogenicity, tumorigenicity, and plasticity for inducing differentiation. It has been found that most cancer cells of the cell line expressed multilineage stem cell markers under the routine culture conditions and generated single-cell clones in anchorage-dependent or -independent conditions. These cancer cells could form subcutaneous xenograft tumors and orthotopic lung xenograft tumors in BALB/C-nude mice. Most cells in xenograft tumors expressed stem cell markers and proliferation cell nuclear antigen Ki67, suggesting that these cancer cells remained stemness and highly proliferative ability in vivo. Intriguingly, the cancer cells could be induced to differentiate into neurons, adipocytes, and osteocytes, respectively, in vitro. During the processes of cellular phenotype-conversions, autophagy and apoptosis were two main metabolic events. There is cross-talking between autophagy and apoptosis in the differentiated cancer cells. In addition, the effects of the inhibitor and agonist for Sirtuin1/2 on the inducing osteogenic differentiation indicated that Sirtuin1/2 had an important role in this process. Taken together, these results indicate that most cancer cells of NCI-H446 cell line possess stemness and plasticity for multilineage differentiation. These findings have potentially some translational applications in treatments of SCLC with inducing differentiation therapy.
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Li Y, He J, He X, Li Y, Lindgren U. Nampt expression increases during osteogenic differentiation of multi- and omnipotent progenitors. Biochem Biophys Res Commun 2013; 434:117-23. [PMID: 23537654 DOI: 10.1016/j.bbrc.2013.02.132] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 02/21/2013] [Indexed: 01/02/2023]
Abstract
Despite emerging data showing that metabolic changes occur with stem cell differentiation, the cross-talk between factors governing energy metabolism and epigenetic modification is not understood. Nicotinamide adenine dinucleotide (NAD) participates in both energy metabolism and protein modification processes. Changes of the intracellular NAD concentration have been shown to correlate with differentiation of adult and embryonic stem cells. In the present study, we investigated the expression pattern of Nampt, the rate-limiting enzyme in NAD salvaging pathway, during osteogenic differentiation of the multipotent mouse fibroblast C3H10T1/2 and the omnipotent preosteoblast MC3T3-E1 cells. We found that Nampt was increasingly expressed during differentiation in both cell models. The increase of Nampt was associated with higher NAD concentration and Sirt1 activity. Knockdown of Nampt or addition of its specific inhibitor FK866 leads to lower intracellular NAD concentration and decline in osteogenesis. These findings indicate that osteogenic differentiation correlates with intracellular NAD metabolism in which Nampt plays a regulatory role.
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Affiliation(s)
- Yan Li
- Division of Orthopedics, Department for Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
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