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Wu N, Zhang H, Deng F, Li R, Zhang W, Chen X, Wen S, Wang N, Zhang J, Yin L, Liao Z, Zhang Z, Zhang Q, Yan Z, Liu W, Wu D, Ye J, Deng Y, Yang K, Luu HH, Haydon RC, He TC. Overexpression of Ad5 precursor terminal protein accelerates recombinant adenovirus packaging and amplification in HEK-293 packaging cells. Gene Ther 2014; 21:629-37. [PMID: 24784448 DOI: 10.1038/gt.2014.40] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/13/2014] [Accepted: 03/21/2014] [Indexed: 12/29/2022]
Abstract
Recombinant adenoviruses are one of the most common vehicles for efficient in vitro and in vivo gene deliveries. Here, we investigate whether exogenous precursor terminal protein (pTP) expression in 293 cells improves the efficiency of adenovirus packaging and amplification. We used a piggyBac transposon-based vector and engineered a stable 293 line that expresses high level of Ad5 pTP, designated as 293pTP. Using the AdBMP6-GLuc that expresses green fluorescent protein (GFP), BMP6 and Gaussia luciferase, we found that the infectivity of AdBMP6-GLuc viral samples packaged in 293pTP cells was titrated up to 19.3 times higher than that packaged in parental 293 cells. AdBMP6-GLuc viral samples packaged in 293pTP cells exhibited significantly higher transduction efficiency in 143B and immortalized mouse embryonic fibroblast (iMEF) cells, as assessed by fluorescence-activated cell sorting analysis of GFP-positive cells, the luciferase activity assay and BMP6-induced osteogenic marker alkaline phosphatase activities in iMEFs. When adenovirus amplification efficiency was analyzed, we found that 293pTP cells infected with AdBMP6-GLuc yielded up to 12.6 times higher titer than that in parental 293 cells, especially at lower multiplicities of infection. These results strongly suggest that exogenous pTP expression may accelerate the packaging and amplification of recombinant adenoviruses. Thus, the engineered 293pTP cells should be a superior packaging line for efficient adenovirus production.
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Qin Y, Deng Y, Ricketts C, Srikantan S, Wang E, Maher E, Dahia PL. The tumor susceptibility gene TMEM127 is mutated in renal cell carcinomas and modulates endolysosomal function. Hum Mol Genet 2014; 23:2428-39. [PMID: 24334765 PMCID: PMC3976335 DOI: 10.1093/hmg/ddt638] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 12/10/2013] [Accepted: 12/10/2013] [Indexed: 11/13/2022] Open
Abstract
TMEM127 is an endosome-associated tumor suppressor gene in pheochromocytomas, neuroendocrine tumors that can co-occur with renal cell carcinomas (RCCs). TMEM127 loss leads to increased mTOR signaling. However, the spectrum of tumors with TMEM127 mutation and how TMEM127 and mTOR interact in tumorigenesis remains unknown. Here, we report that germline TMEM127 mutations occur in RCCs and that some mutant proteins, unlike wild-type (WT) TMEM127, fail to cooperate with activated early endosomal GTPase, Rab5, to inhibit mTOR signaling. Tmem127-null mouse embryonic fibroblasts (MEFs) are deficient in generating early-to-late hybrid endosomes upon constitutive Rab5 activation, a defect rescued by WT, but not mutant, TMEM127. This endosomal dysfunction results in diminished mTOR colocalization with Rab5-positive vesicles. Conversely, active, lysosomal-bound mTOR is increased in Tmem127-null MEFs, which also display enhanced lysosomal biogenesis. Our data map the tumor-suppressive properties of TMEM127 to modulation of mTOR function in the endolysosome, a feature that may contribute to both pheochromocytoma and RCC pathogenesis.
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253
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Deng Y, Cheng J, Jing H, Yi S. Bose-Einstein condensates with cavity-mediated spin-orbit coupling. PHYSICAL REVIEW LETTERS 2014; 112:143007. [PMID: 24765955 DOI: 10.1103/physrevlett.112.143007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Indexed: 06/03/2023]
Abstract
We propose a novel scheme to generate the spin-orbit coupling for a condensate placed inside an optical cavity by using a standing wave and a traveling wave. It is shown that the interplay of the laser lights and the cavity gives rise to rich quantum phases. Our scheme also generates a large synthetic magnetic field for the dressed spin state, which may facilitate the study of the quantum Hall effect in ultracold atomic gases.
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Mei S, Zhang J, Deng Y, Stewart D. Genetic enhancement of mesenchymal stem cells using minicircle-based vehicle shows superior therapeutic benefit in a mouse model of acute lung injury. Cytotherapy 2014. [DOI: 10.1016/j.jcyt.2014.01.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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255
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Yu X, Yu C, Ren Z, Deng Y, Song J, Zhang H, Zhou H. Genetic variants of 17q21 are associated with childhood-onset asthma and related phenotypes in a northeastern Han Chinese population: a case-control study. ACTA ACUST UNITED AC 2014; 83:330-6. [PMID: 24649901 DOI: 10.1111/tan.12342] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 02/01/2014] [Accepted: 02/23/2014] [Indexed: 02/03/2023]
Abstract
A genome-wide association study (GWAS) suggested that variants on chromosome 17q21 were associated with childhood-onset asthma in white populations. Two replication studies had been conducted in southern Han Chinese population in 2009 and 2012. However, these two Chinese replication results were inconsistent. To further confirm the role of 17q21 common variants, an association study of 17q21 single nucleotide polymorphisms (SNPs) with the risk of childhood-onset asthma was performed in a Han population from northeastern China. In this study, rs3894194, rs12603332 and rs11650680 were genotyped in 435 asthmatic children and 601 healthy controls by using a SNaPshot method. Our data showed that the allelic frequency of rs12603332 and rs11650680 showed significant differences between asthmatic cases and healthy controls, with an odds ratio (OR) of 1.36 [95% confidence interval (CI) 1.12-1.65, P=0.002] and an OR of 1.36 (95% CI 1.07-1.74, P=0.01). Genotype distribution analysis also showed the significant associations of the above two loci with childhood asthma under dominant, recessive and additive model (dominant OR=1.57, 95% CI 1.04-2.36, P=0.032; recessive OR=1.41, 95% CI 1.09-1.83, P=0.009; additive OR=1.97, 95% CI 1.24-3.14, P=0.004; recessive OR=1.50, 95% CI 1.13-1.98, P=0.005). Besides, linear regression analysis showed that rs3894194 and rs12603332 were also significantly associated with asthma phenotypes such as log10 -transformed immunoglobulin E (IgE) level (IU/ml) and log10 -transformed eosinophil percentage (dominant, P=0.04; additive, P=0.01; recessive, P=0.04; recessive, P=0.03; additive, P=0.02). Collectively, our findings suggest that orosomucoid 1-like 3 (ORMDL3) locus on chromosome 17q21 is a risk factor for childhood-onset asthma in northeastern Han Chinese population. Further studies will be needed to elucidate the pathogenesis that ORMDL3 locus predisposes to childhood-onset asthma.
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Deng Y, Ng ESK, Kwan YW, Lau CBS, Cheung DWS, Koon JCM, Zhang Z, Zuo Z, Leung PC, Fung KP, Lam FFY. Cerebral vasodilator properties of Danshen and Gegen: a study of their combined efficacy and mechanisms of actions. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2014; 21:391-399. [PMID: 24192211 DOI: 10.1016/j.phymed.2013.09.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 08/07/2013] [Accepted: 09/29/2013] [Indexed: 06/02/2023]
Abstract
Danshen and Gegen are two commonly used Chinese herbal medicines for treatment of cardiovascular diseases. The aim of the present study was to elucidate the combination effects of these two herbs on cerebral vascular tone and their underlying mechanisms of actions. Basilar artery rings were obtained from rats and precontracted with U46619. Cumulative administrations of aqueous extracts of Danshen, Gegen, or the two herbs combined (DG; ratio 7:3) produced concentration-dependent relaxation of the artery rings. Statistical analysis on these findings produced a combination index (CI) of 1.041 at ED50, which indicates the two herbs produced additive vasodilator effects when used as a combined decoction. Removal of the endothelium had no effect on the vasodilator properties of Danshen, Gegen, and DG. However, their maximum effects (Imax) were significantly blunted by a KATP channel inhibitor glibenclamide, a non-selective K(+) channel inhibitor tetraethylammonium (TEA), and by a combination of K(+) channel inhibitors (glibenclamide+TEA+iberiotoxin+4-aminopyridine+barium chloride). In addition, Danshen, Gegen, and DG produced augmentation of KATP currents and inhibited Ca(2+) influx in vascular smooth muscle cells isolated from rat basilar arteries. Furthermore, these agents inhibited CaCl2-induced contraction in the artery rings. In conclusion, the present study showed that Danshen and Gegen produced additive vasodilator effects on rat cerebral basilar arteries. These effects were independent of endothelium-derived relaxant factors (EDRF), but required the opening of KATP channels and inhibition of Ca(2+) influx in the vascular smooth muscle cells. It is suspected that the cerebral vasodilator effects of Danshen and Gegen produced either on their own or in combination, can help patients with obstructive cerebrovascular diseases.
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Xie H, Fan X, Tang X, Wan Y, Chen F, Wang X, Wang Y, Li Y, Tang M, Liu D, Jiang Z, Liu X, Yuan W, Li G, Ye X, Zhou J, Mo X, Deng Y, Wu X. The LIM protein fhlA is essential for heart chamber development in zebrafish embryos. Curr Mol Med 2014; 13:979-92. [PMID: 23438903 DOI: 10.2174/1566524011313060010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 01/08/2013] [Accepted: 02/11/2013] [Indexed: 11/22/2022]
Abstract
Four-and-a-half LIM proteins FHL1-3 play important roles in cardiovascular pathophysiology. However, their roles in heart development remain unclear. Here, we report that fhlA, the zebrafish homolog of human FHL1, was found to be expressed around the 22-somite stage. After 24 hpf, expression was restricted to the heart. fhlA knockdown caused an enlarged cardiac chamber phenotype with up-regulated expression of the cardiac markers, but fhlA overexpression reduced the sizes of the cardiac chambers and down-regulated expression of the markers. The morphology associated with the cmlc2, amhc, and vmhc expression patterns at the 22 somite and 24 hpf stages included a broadened domain in embryos lacking fhlA and a smaller domain in embryos overexpressing fhlA. The changes in the sizes of the chambers were attributed to the changes in the number of ventricular and atrial cells. Loss of fhlA caused a longer heart period and pause between heartbeats in M-modes than in controls, but fhlA overexpression caused shorter systolic and diastolic intervals. Abnormal cardiac chambers and physiological function were found to be largely rescued. We also showed the expression of fhlA in the heart to be increased by retinoic acid (RA) and decreased by the RA synthase inhibitor DEAB. Both fhlA and RA signaling caused a phenotype characterized by the morphological alterations in the chamber sizes, suggesting that the role of fhlA in heart development is probably regulated by RA signaling. Taken together, these results showed that fhlA regulates the size of the heart chamber by reducing the number of cardiac cells.
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Hu S, Yang Y, Wu Q, Rwakaryebe M, Liu Z, Deng Y, Wei S, Zhao T. Results of two different approaches to closure of subaortic ventricular septal defects in children. Eur J Cardiothorac Surg 2014; 46:648-53. [DOI: 10.1093/ejcts/ezu019] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Deng Y, Bi X, Zhou H, You Z, Wang Y, Gu P, Fan X, Fan X. Repair of critical-sized bone defects with anti-miR-31-expressing bone marrow stromal stem cells and poly(glycerol sebacate) scaffolds. Eur Cell Mater 2014; 27:13-24; discussion 24-5. [PMID: 24425157 DOI: 10.22203/ecm.v027a02] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The repair of critical-sized defects (CSDs) is a significant challenge in bone tissue engineering. Combining the use of progenitor cells with gene therapy represents a promising approach for bone regeneration. MicroRNAs play important roles in most gene regulatory networks, regulate the endogenous expression of multiple growth factors and simultaneously modulate stem cell differentiation. Our previous study showed that knocking down miR-31 promotes the osteogenesis of bone marrow stromal stem cells (BMSCs). To investigate the therapeutic potential of cells engineered to express anti-miR-31 for CSD repair, lentiviral vectors encoding negative control, miR-31 precursor and anti-sense sequences were constructed and transduced into osteo-inductive BMSCs. The expression of osteogenic-specific genes, alkaline phosphatase activity and Alizarin Red S staining were investigated to evaluate the effects of miR-31 on the cell fate of BMSCs over a 3-week period. In addition, miR-31-modified BMSCs seeded on poly(glycerol sebacate) (PGS) scaffolds were used to repair 8 mm critical-sized calvarial defects in rats. The results showed that miR-31 suppression significantly increased the expression of osteogenic-specific genes in vitro at the mRNA and protein levels, and that robust new bone formation with high local bone mineral density was observed in the anti-miR groups in vivo. Moreover, the PGS scaffolds carrying anti-miR-31-expressing BMSCs exhibited good biocompatibility and a high regeneration rate (~60%) within in vivo bone defects. Our results suggest that miR-31 gene delivery affects the potential of BMSCs for osteogenic differentiation and bone regeneration and that PGS is a potential substrate for genetically modified, tissue-engineered bone in the repair of large bone defects.
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Cui H, Liu B, Song Z, Fang J, Deng Y, Zhang S, Wang H, Wang Z. Efficacy and safety of long-term tadalafil 5 mg once daily combined with sildenafil 50 mg as needed at the early stage of treatment for patients with erectile dysfunction. Andrologia 2014; 47:20-4. [PMID: 24387078 DOI: 10.1111/and.12216] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/08/2013] [Indexed: 11/30/2022] Open
Abstract
This study aimed to evaluate the efficacy and safety of long-term and low-dose tadalafil combined with sildenafil as needed at the early stage of treatment for erectile dysfunction (ED). We enrolled 180 patients with ED 1 : 1 to tadalafil 5 mg once daily or once-a-day tadalafil 5 mg combined with sildenafil 50 mg as needed. The efficacy measures included the 5-item version of the International Index of Erectile Function (IIEF-5) and the Sexual Encounter Profile (SEP). The safety was assessed by observing drug tolerability and adverse events. Total IIEF-5 scores of patients with severe ED in combined medication group were significantly higher than in tadalafil alone group. Question 2 scores of IIEF-5 of patients with moderate and severe ED in combined medication group were significantly higher than in tadalafil alone group. The significant improvement in question 3 scores of IIEF-5 existed only in patients with severe ED receiving combined medication. The percentage of 'yes' responses to SEP4, SEP5 and partner's SEP3 were improved significantly in combined medication group. There was no difference between two groups in the incidence of adverse events. Our results suggest that combined medication can better improve erectile function, especially for patients with severe ED.
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261
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Keshtov ML, Deng Y, Xie Z, Geng Y, Kuklin SA, Kochurov VS, Khokhlov AR, Koukaras EN, Sharma GD. Synthesis and photovoltaic properties of new donor–acceptor (D–A) copolymers based on benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene donor and different acceptor units (P1 and P2). RSC Adv 2014. [DOI: 10.1039/c4ra05680a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A power conversion efficiency of about 5.26% has been achieved for the device based onP1:PC71BM.
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Lu F, Lao Y, Sun H, Lei C, Deng Y, Luo C, Jiang JR, Shi DS. 195 EFFECTS OF GSK3 INHIBITOR ON THE PLURIPOTENCY MAINTENANCE OF BUFFALO EMBRYONIC STEM-CELL-LIKE CELLS. Reprod Fertil Dev 2014. [DOI: 10.1071/rdv26n1ab195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In this study, to explore the effects and mechanism of Wnt/β-catenin signalling pathway on the maintenance of pluripotency of buffalo embryonic stem-cell-like cells (buffalo ESC-like cells), the GSK3 inhibitors BIO and CHIR99021 were added throughout the experiment – i.e. from buffalo inner cell mass (ICM) culture to ESC-like line generation. The buffalo ICM were respectively cultured in the medium containing 0.5 μg mL–1 BIO and 5 mmol L–1 CHIR99021. The percentage of ICMs attachment and primary colony formation were observed, and found that there was no significant difference in the ICMs attachment rate among of the BIO, CHIR99021, and the control groups (91.18% and 92.98% v. 94.59%; P > 0.05). Treating ICMs with CHIR99021 resulted in more primary colony formation rate compared with the control group (77.71% v. 55.41%; P < 0.05). The proliferation rate of primary colonies of buffalo ESC-like cells was detected by bromodeoxyuridine immunofluorescence techniques. The results show that the proliferation rate of primary colonies in the group of buffalo ESC-like cells treated with CHIR99021 was significantly higher than that of the control group on Day 1, Day 3, Day 4, and Day 5 (P < 0.05), and it was also evidently higher than that of control group only on Day 1 (P < 0.05) in the group of BIO, but there was no significant difference in other days (P > 0.05). The mRNA expression level of proliferation marker PCNA of ESC-like cells was significantly up-regulated in both CHIR99021 and BIO treatment groups (P < 0.05), however, treating buffalo ESC-like cells with CHIR99021 significantly up-regulated the expression of pluripotent gene Oct4 and Sox2 (P < 0.05), but had no effect on pluripotent gene Nanog expression (P > 0.05). Oct4 expression was significantly increased (P < 0.05), and the expression of Sox2 and Nanog were significantly decreased (P < 0.05) in the group of BIO treatment. Furthermore, the relative protein level of β-catenin (the downstream effector of Wnt/β-catenin signalling pathway) and the mRNA expression level of c-Myc (the downstream target gene of Wnt/β-catenin signalling pathway) were significantly increased when buffalo ESC-like cells respectively treated with CHIR99021 and BIO (P < 0.05). In conclusion, treating buffalo ESC-like cells with GSK3 inhibitors CHIR99021 can promote proliferation of buffalo ESC-like cells, maintain their undifferentiated state, and up-regulate the expression levels of β-Catenin and c-Myc in buffalo ESC-like cells. These results indicate that Wnt/β-catenin signalling pathway plays an important role in regulation of self-renewal of buffalo ESC-like cells.
This work was funded by the China High Technology Development Program (2011AA100607), China Natural Science Foundation (31072033), and Guangxi Science Foundation (2012GXNSFFA060004).
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Deng Y, Zhou J, Fang L, Cai Y, Ke J, Xie X, Huang Y, Huang M, Wang J. ALDH1 is an independent prognostic factor for patients with stages II-III rectal cancer after receiving radiochemotherapy. Br J Cancer 2013; 110:430-4. [PMID: 24327017 PMCID: PMC3899780 DOI: 10.1038/bjc.2013.767] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 10/09/2013] [Accepted: 10/25/2013] [Indexed: 01/02/2023] Open
Abstract
Background: About one in five patients with locally advanced rectal cancer (RC) suffers recurrence or distant metastasis after neoadjuvant therapy. We investigated how cancer stem cell markers change after neoadjuvant therapy and how these markers relate to recurrence. Methods: Pretreatment biopsies and postoperative specimens were taken from 64 patients with locally advanced rectal adenocarcinoma who received preoperative radiochemotherapy (RCT) between sampling. Samples were tested immunohistochemically for CD44, LGR5, ALDH1 and CD166; scores were dichotomised as high or low. The median follow-up period was 36 months. Results: High expression of CD44, LGR5, ALDH and CD166 was found in 38%, 5%, 48% and 10%, respectively, before RCT and 86%, 33%, 71% and 52%, respectively, after RCT. CD44 (P=0.001), LGR5 (P=0.049) and CD166 (P=0.003) were significantly upregulated after RCT. Whereas no recurrence was seen during the follow-up in the low ALDH group, 40% of the high ALDH group suffered recurrence. In multivariate COX analysis, postoperative ALDH1 independently predicted poor prognosis in patients with RC who received RCT (P=0.0095). Conclusion: Preoperative RCT upregulates expression of stem cell markers in patients with RC. High post-treatment ALDH1 expression predicts poor prognosis for these patients after neoadjuvant therapy.
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Yin F, Lin J, Mao X, Deng Y, Chen Q. Preparation and Characterization of Bamboo Fibers Coated with Titanium Urushiol and its Composite Materials with Polypropylene. INT POLYM PROC 2013. [DOI: 10.3139/217.2751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Bamboo fibers (BFs) coated with titanium urushiol (BFTiU) was prepared by in situ reaction. Effects of activation time, urushiol concentration, reaction time and butyl titanate concentration etc on the coating ratio of BFTiU were investigated. On the other hand, the BFTiU was characterized by FTIR measurements, scanning electron microscope, thermo gravimetric analysis and differential scanning calorimetry. The results showed that titanium urushiol compound was coated on the BFs by coordination reaction and the coating ratio of BFTiU reached 35% at the optimal preparation condition. It also could be found that BFTiU possessed better heat resistant properties than BFs. Due to titanium urushiol coated on BFs, the elongation at break, the maximum deflection and the bending strength of BFTiU/PP composites were 33%, 30 % and 10% higher than those of BP/PP composites respectively. Particularly, the tensile strength of BFTiU/PP composites was better than that of BP/PP composites at the presence of 70% BFTiU.
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265
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Deng Y, Zhang X, Zhao X, Li Q, Ye Z, Li Z, Liu Y, Zhou Y, Ma H, Pan G, Pei D, Fang J, Wei S. Long-term self-renewal of human pluripotent stem cells on peptide-decorated poly(OEGMA-co-HEMA) brushes under fully defined conditions. Acta Biomater 2013; 9:8840-50. [PMID: 23891809 DOI: 10.1016/j.actbio.2013.07.017] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 07/13/2013] [Accepted: 07/16/2013] [Indexed: 01/07/2023]
Abstract
Realization of the full potential of human induced pluripotent stem cells (hiPSC) in clinical applications requires the development of well-defined culture conditions for their long-term growth and directed differentiation. This paper describes a novel fully defined synthetic peptide-decorated substrate that supports self-renewal of hiPSC in commercially available xeno-free, chemically defined medium. The Au surface was deposited by a poly(OEGMA-co-HEMA) film, using the surface-initiated polymerization method (SIP) with the further step of carboxylation. The hiPSC generated from umbilical cord mesenchymal cells were successfully cultured for 10 passages on the peptide-tethered poly(OEGMA-co-HEMA) brushes for the first time. Cells maintained their characteristic morphology, proliferation and expressed high levels of markers of pluripotency, similar to the cells cultured on Matrigel™. Moreover, the cell adhesion could be tuned by the pattern and peptide concentration on the substrate. This well-defined, xeno-free and safe substrate, which supports long-term proliferation and self-renewal of hiPSC, will not only help to accelerate the translational perspectives of hiPSC, but also provide a platform to elucidate the underlying molecular mechanisms that regulate stem cell proliferation and differentiation via SIP technology.
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266
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Chan LH, Wang W, Yeung W, Deng Y, Yuan P, Mak KK. Hedgehog signaling induces osteosarcoma development through Yap1 and H19 overexpression. Oncogene 2013; 33:4857-66. [PMID: 24141783 DOI: 10.1038/onc.2013.433] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 09/06/2013] [Accepted: 09/13/2013] [Indexed: 02/06/2023]
Abstract
Osteosarcoma is one of the most common bone tumors. However, the genetic basis for its pathogenesis remains elusive. Here, we investigated the roles of Hedgehog (Hh) signaling in osteosarcoma development. Genetically-engineered mice with ubiquitous upregulated Hh signaling specifically in mature osteoblasts develop focal bone overgrowth, which greatly resembles the early stage of osteosarcoma. However, these mice die within three months, which prohibits further analysis of tumor progression. We therefore generated a mouse model with partial upregulated Hh signaling in mature osteoblasts and crossed it into a p53 heterozygous background to potentiate tumor development. We found that these mutant mice developed malignant osteosarcoma with high penetrance. Isolated primary tumor cells were mainly osteoblastic and highly proliferative with many characteristics of human osteosarcomas. Allograft transplantation into immunocompromised mice displayed high tumorigenic potential. More importantly, both human and mouse tumor tissues express high level of yes-associated protein 1 (Yap1), a potent oncogene that is amplified in various cancers. We show that inhibition of Hh signaling reduces Yap1 expression and knockdown of Yap1 significantly inhibits tumor progression. Moreover, long non-coding RNA H19 is aberrantly expressed and induced by upregulated Hh signaling and Yap1 overexpression. Our results demonstrate that aberrant Hh signaling in mature osteoblasts is responsible for the pathogenesis of osteoblastic osteosarcoma through Yap1 and H19 overexpression.
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267
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Schlosser K, Deng Y, Stewart DJ. Circulating Extracellular Microrna-21 Is a Biomarker for Disease Activity in the Monocrotaline Rat Model of Pulmonary Arterial Hypertension. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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268
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Jiang B, Deng Y, Taha M, Wen S, Courtman D, Stewart D. Strain-Specific Differences in the Response to Inhibition of VEGFR2 in the SU5416 Model of Severe Plexogenic Pulmonary Arterial Hypertension. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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269
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Shen Y, Xia F, Liu L, Lin W, Liu Y, Shi M, Ren X, Ding B, Chen Y, Jia H, Wang J, Zhao G, Deng Y. Vagus nerve stimulation in 19 patients with drug-resistant epilepsy in Western China. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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270
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Shen Y, Deng Y, Lin W, Zhao G, Wang J, Xia F, Zhang Z, Feng G, Shi M, Liu L, Ren X, Ding B, Zhao Y, Chen Y, Jia H. Seizure freedom of Epilepsia Partialis Continua (EPC) with vagus nerve stimulation (VNS) therapy: A case report. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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271
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Schlosser K, Muleme H, Taha M, Deng Y, Mei S, Stewart D. Transgenic Overproduction of Circulating Angiopoietin-2 Increases Susceptibility to Endotoxin-Induced Lung Injury in Mice. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.607] [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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Suen C, Deng Y, Stewart DJ. Endothelial Progenitor Cell Therapy Derived Improves Monocrotaline-Induced Pulmonary Arterial Hypertension in Immunodeficient but not Immune Competent Rats. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Drozd K, Deng Y, Jiang B, Lockwood J, Thorn S, Klein R, Stewart D, Beanlands R, deKemp R, DaSilva J, Mielniczuk L. Elevated Fatty Acid and Glucose Uptake in Right Ventricle in a Sugen 5416/Hypoxia Rat Model of Severe Pulmonary Artery Hypertension. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Li Y, Deng Y, Tang Y, Yu H, Gao C, Liu L, Liu L, Yao P. Quercetin protects rat hepatocytes from oxidative damage induced by ethanol and iron by maintaining intercellular liable iron pool. Hum Exp Toxicol 2013; 33:534-41. [PMID: 23928830 DOI: 10.1177/0960327113499168] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Accumulating evidence has shown that ethanol-induced iron overload plays a crucial role in the development and progression of alcoholic liver disease. We designed the present study to investigate the potential protective effect of quercetin, a naturally occurring iron-chelating antioxidant on alcoholic iron overload and oxidative stress. Ethanol-incubated (100 mmol/L) rat primary hepatocytes were co-treated by quercetin (100 µmol/L) and different dose of ferric nitrilotriacetate (Fe-NTA) for 24 h. When the hepatic enzyme releases in the culture medium, redox status of hepatocytes and the intercellular labile iron pool (LIP) level were assayed. Our data showed that Fe-NTA dose dependently induced cellular leakage of aspartate transaminase and lactate dehydrogenase, glutathione depletion, superoxide dismutase inactivation, and overproduction of malondialdehyde) and reactive oxygen species (ROS) of intact and especially ethanol-incubated hepatocytes. The oxidative damage resulted from ethanol, Fe-NTA, and especially their combined treatment was substantially alleviated by quercetin, accompanying the corresponding normalization of intercellular LIP level. Iron in excess, thus, may aggravate ethanol hepatotoxicity through Fenton-active LIP, and quercetin attenuated ethanol-induced iron and oxidative stress. To maintain intercellular LIP contributes to the hepatoprotective effect of quercetin besides its direct ROS-quenching activity.
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Wang X, Liao P, Fan X, Wan Y, Wang Y, Li Y, Jiang Z, Ye X, Mo X, Ocorr K, Deng Y, Wu X, Yuan W. CXXC5 Associates with Smads to Mediate TNF-α Induced Apoptosis. Curr Mol Med 2013; 13:1385-96. [DOI: 10.2174/15665240113139990069] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 06/05/2013] [Accepted: 07/23/2013] [Indexed: 11/22/2022]
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