126
|
Chen C, Sidharta S, Koh W, Yuan J, Ma S, Heng D, Tan K, Yoong J. FORECASTING HOSPITAL UTILIZATION AND COST OF FUTURE ELDERLY IN SINGAPORE. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
127
|
Chan W, Lautenschlager N, Dow B, Ma S, Wong C, Lam L. HOME-BASED EXERCISE FOR DEPRESSIVE SYMPTOMS AMONG CARERS OF PERSONS WITH DEMENTIA: INTERIM FINDINGS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
128
|
Collins G, Noy A, de Vos S, Thieblemont C, Martin P, Flowers C, Morschhauser F, Ma S, Coleman M, Peles S, Smith S, Barrientos J, Smith A, Munneke B, Dimery I, Beaupre D, Chen R. Safety and efficacy of single-agent ibrutinib in patients with relapsed/refractory (R/R) marginal zone lymphoma (MZL): A multicenter, open-label, phase 2 study. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_76] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
129
|
Xie Z, Zhang J, Ma S, Huang X, Huang Y. Effect of Chinese herbal medicine treatment on plasma lipid profile and hepatic lipid metabolism in Hetian broiler. Poult Sci 2017; 96:1918-1924. [DOI: 10.3382/ps/pew456] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 12/04/2016] [Indexed: 12/27/2022] Open
|
130
|
Zhang G, Zhu Y, Qin W, Yu L, Wu G, Ma S, Wang F, Qin R, Yang X, Tao K, Yue S, Zhao G, Yang Z, Yuan J, Dou K, Yuan J. Combined Kidney Transplantation and Splenic Fossa Auxiliary Heterotopic Liver Transplantation in a Highly Sensitized Recipient: A Case Report. Transplant Proc 2017; 48:3191-3196. [PMID: 27932179 DOI: 10.1016/j.transproceed.2016.09.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/23/2016] [Accepted: 09/01/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND Combined kidney and auxiliary orthotopic liver transplantation from the same donor is used to treat highly sensitized renal transplant recipients. Auxiliary liver can protect the transplanted kidney against hyperacute rejection. METHODS In the current case, combined kidney and splenic fossa auxiliary heterotopic liver transplantation was performed from the same donor for a highly sensitized recipient without preoperative preconditioning. No postoperative hyperacute rejection occurred. RESULTS Seven days after surgery, preexisting antibody levels rose and decreased after treatment; meanwhile, the function of transplanted kidney returned to normal. During 24 months of follow-up, the grafts showed good blood perfusion and functioned well. The levels of preexisting antibodies, donor-specific antibodies (DSA) and C1q-fixing human leukocyte antigen (C1q-HLA) antibodies, all decreased. CONCLUSIONS Combined kidney and splenic fossa auxiliary heterotopic liver transplantation can be used in renal transplantation for highly sensitized recipients.
Collapse
|
131
|
Li Q, Ma S, Bishai D, Hyder AA. Potential gains in life expectancy by improving road safety in China. Public Health 2017; 144S:S57-S61. [PMID: 28288733 DOI: 10.1016/j.puhe.2016.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 11/19/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Road traffic injuries (RTI) cause a significant number of injuries and deaths in China every year; the World Health Organization estimated 261,367 deaths due to RTI in 2013. As a result of the ongoing growth of China's economy, road construction and motorisation, RTI are expected to impose a heavy health burden in the future. However, the public and policy makers have not widely perceived RTI as a public health issue commensurate with its consequences, in part, due to a lack of intuitive indicator measuring the health impact. STUDY DESIGN Employs the cause-eliminating life table technique to provide a measure of the burden of RTI based on data from a nationally representative surveillance system in China. METHODS Previous studies have used indicators such as event counts, rates and disability-adjusted life years to measure the health impact of RTI; but this study uses potential gains in life expectancy to measure this impact. RESULTS Eliminating RTI could lead to a gain of 0.52 years in life expectancy in 2012, meaning that on average Chinese people could live a half year more than they would in the presence of RTI. Males have a substantially higher RTI death rate and consequently could have a gain in life expectancy more than twice as large as females (male 0.72 years vs female 0.28 years). The gain in rural areas (0.65 years) is twice that in urban areas (0.32 years). CONCLUSIONS The significant gain in life expectancy signals the urgency for public actions to improve road safety; the disparity in the burden across regions and sexes indicate a great opportunity for targeted interventions to protect health and save lives.
Collapse
|
132
|
Xiong Y, Xu W, Yang H, Wang P, Ma S, Zhao S, Ye D, Guan K. P08.65 The mechanisms of oncometabolites in epigenetic control, DNA repair, neural development and gliomagenesis. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
133
|
Chan HF, Ma S, Tian J, Leong KW. High-throughput screening of microchip-synthesized genes in programmable double-emulsion droplets. NANOSCALE 2017; 9:3485-3495. [PMID: 28239692 PMCID: PMC5428077 DOI: 10.1039/c6nr08224f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The rapid advances in synthetic biology and biotechnology are increasingly demanding high-throughput screening technology, such as screening of the functionalities of synthetic genes for optimization of protein expression. Compartmentalization of single cells in water-in-oil (W/O) emulsion droplets allows screening of a vast number of individualized assays, and recent advances in automated microfluidic devices further help realize the potential of droplet technology for high-throughput screening. However these single-emulsion droplets are incompatible with aqueous phase analysis and the inner droplet environment cannot easily communicate with the external phase. We present a high-throughput, miniaturized screening platform for microchip-synthesized genes using microfluidics-generated water-in-oil-in-water (W/O/W) double emulsion (DE) droplets that overcome these limitations. Synthetic gene variants of fluorescent proteins are synthesized with a custom-built microarray inkjet synthesizer, which are then screened for expression in Escherichia coli (E. coli) cells. Bacteria bearing individual fluorescent gene variants are encapsulated as single cells into DE droplets where fluorescence signals are enhanced by 100 times within 24 h of proliferation. Enrichment of functionally-correct genes by employing an error correction method is demonstrated by screening DE droplets containing fluorescent clones of bacteria with the red fluorescent protein (rfp) gene. Permeation of isopropyl β-d-1-thiogalactopyranoside (IPTG) through the thin oil layer from the external solution initiates target gene expression. The induced expression of the synthetic fluorescent proteins from at least ∼100 bacteria per droplet generates detectable fluorescence signals to enable fluorescence-activated cell sorting (FACS) of the intact droplets. This technology obviates time- and labor-intensive cell culture typically required in conventional bulk experiment.
Collapse
|
134
|
Ma S, Goldstein M, Pitman AJ, Haghdadi N, MacGill I. Pricing the urban cooling benefits of solar panel deployment in Sydney, Australia. Sci Rep 2017; 7:43938. [PMID: 28262843 PMCID: PMC5338272 DOI: 10.1038/srep43938] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 01/31/2017] [Indexed: 11/09/2022] Open
Abstract
Cities import energy, which in combination with their typically high solar absorption and low moisture availability generates the urban heat island effect (UHI). The UHI, combined with human-induced warming, makes our densely populated cities particularly vulnerable to climate change. We examine the utility of solar photovoltaic (PV) system deployment on urban rooftops to reduce the UHI, and we price one potential value of this impact. The installation of PV systems over Sydney, Australia reduces summer maximum temperatures by up to 1 °C because the need to import energy is offset by local generation. This offset has a direct environmental benefit, cooling local maximum temperatures, but also a direct economic value in the energy generated. The indirect benefit associated with the temperature changes is between net AUD$230,000 and $3,380,000 depending on the intensity of PV systems deployment. Therefore, even very large PV installations will not offset global warming, but could generate enough energy to negate the need to import energy, and thereby reduce air temperatures. The energy produced, and the benefits of cooling beyond local PV installation sites, would reduce the vulnerability of urban populations and infrastructure to temperature extremes.
Collapse
|
135
|
Yu X, Huang Y, Guo Q, Wang Y, Ma H, Zhao Y, Wang Y, Yu X, Tan G, Ma S, Wu X, Xu M, Zhang S, Shang H, Xin S, Zhang X, Wang J, Li L, Wu S, Zhao S, Yang J, Wen H, Sun H, Xiong Y, Wang Y, He J, Liu Q, Li J, Jiang J, Xue F, Han W, Wang Z, Wang Y, Hu Y, Wang L. Clinical motivation and the surgical safety checklist. Br J Surg 2017; 104:472-479. [PMID: 28158915 DOI: 10.1002/bjs.10446] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 08/09/2016] [Accepted: 11/03/2016] [Indexed: 12/17/2022]
Abstract
Abstract
Background
Although the surgical safety checklist (SSC) has been adopted worldwide, its efficacy can be diminished by poor clinical motivation. Systematic methods for improving implementation are lacking.
Methods
A multicentre prospective study was conducted in 2015 in four academic/teaching hospitals to investigate changes during revision of the SSC for content, staffing and workflow. All modifications were based on feedback from medical staff. Questionnaires were used to monitor dynamic changes in surgeons', nurses' and anaesthetists' perceptions.
Results
Complete information was obtained from 30 654 operations in which the newly developed SSC system was used. Implementation quality was evaluated in 1852 operations before, and 1822 after the changes. The revised SSC content was simplified from 34 to 22 items. Anaesthetists achieved widespread recommendation as SSC coordinators. Completion rates of all stages reached over 80·0 per cent at all sites (compared with 10·2–59·5 per cent at the sign-out stage in the baseline survey). There was a significant change in doctors who participated (for example, surgeon: from 24·6 to 64·5 per cent at one site). The rates of hasty (15·1–33·7 per cent) or casual (0·4–4·4 per cent) checking decreased to less than 6·0 per cent overall. Perceptions about the SSC were studied from 2211 forms. They improved, with a converging trend among the three different professions, to a uniform 80·0 per cent agreeing on the need for its regular use.
Conclusion
Medical staff members are both the users and owners of the SSC. High-quality SSC implementation can be achieved by clinically motivated adaptation.
Collapse
|
136
|
Ma S, Wang J, Liu L, Xia L, Tao R. Identification of temporal genes involved in the mechanisms of spinal cord injury. Spinal Cord 2017; 55:355-361. [PMID: 28071686 DOI: 10.1038/sc.2016.183] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 10/24/2016] [Accepted: 11/17/2016] [Indexed: 11/09/2022]
Abstract
OBJECTIVES As a high-cost neurological disability, spinal cord injury (SCI) can result in permanent paralysis and loss of sensation. To identify the temporal genes involved in the pathogenesis of SCI, we analysed the expression profile of GSE45006. METHODS GSE45006 was downloaded from Gene Expression Omnibus, including 20 SCI samples (samples at 1 day, 3 days, 1 week, 2 weeks and 8 weeks after injury, four repetitions for each time point) and 4 normal samples. The Bayesian Estimation of Temporal Regulation (BETR) and randomForest packages were used to screen the temporal genes and the top 100 temporal genes, respectively. Then, the gplots package and Pearson correlation analysis separately were used to perform hot map analysis and expression pattern clustering for the top 100 temporal genes. Using the clusterProfiler package and TargetMine tool, their potential functions were analysed by enrichment analyses. Moreover, interaction relationships between these temporal genes and pathways were investigated by pathway-gene crosslinking networks. RESULTS In total, 1907 temporal genes were identified. The top 100 temporal genes were obtained and divided into six clusters. Most of the gene functions were enriched in biological process categories. ARG1 and NOS3 in cluster 4 were enriched in biological process of arginine catabolic process. TGFβ2, TGFβ3, ALDH2 and ALDH3A2 were correlated with numerous pathways in the pathway-gene crosslinking network. Pathways related to TGFβ2 and TGFβ3 were connected to pathways related to ARG1 and NOS3 via ARG1. CONCLUSION Several temporal genes, including TGFβ2, TGFβ3, ALDH2, ALDH3A2, ARG1 and NOS3, might be involved in SCI.
Collapse
|
137
|
Ma S, Gobis K, Swindell WR, Chaudhuri R, Bojanowski R, Bojanowski K. Synthesis and activity of the salicylic acid ester of bakuchiol in psoriasis-surrogate keratinocytes and skin substitutes. Clin Exp Dermatol 2017; 42:251-260. [PMID: 28052368 DOI: 10.1111/ced.13024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/31/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Topical retinoids are effective in retarding skin ageing and restoring homeostasis in skin conditions such as psoriasis. However their adverse effects (AEs), which include irritation (retinoid dermatitis), photosensitivity and teratogenicity, limit their use and patient compliance. Development of retinoid analogues with minimal AEs would allow a broader and more compliant use. AIM To synthesise a novel molecule, bakuchiol salicylate (bakusylan), with a modulatory gene expression profile similar to retinoids, using as reference three prescription retinoids: tretinoin, tazarotene and adapalene. METHODS We hypothesized that because bakuchiol salicylate has a structure entirely different from existing retinoids, there would be at least a partial uncoupling of AEs from the skin-normalizing activity of this retinoid. This hypothesis was tested at the transcriptional level in psoriatic cytokine-treated cultures of keratinocytes and organotypic skin substitutes, using DNA microarrays and custom PCR arrays. RESULTS Evaluation of the gene expression profile of bakuchiol salicylate revealed elimination of several components of the retinoid-like proinflammatory response and teratogenic signature, without a substantial loss of normalizing potential. A possible mechanism of action, consisting of keratinocyte desensitization to psoriatic cytokine signalling through inhibition of the signal transducer and regulator of transcription (STAT)1/3/interferon inflammatory signal transduction axis was also identified. CONCLUSION Bipartite materials obtained by merging two skin-active entities with specific, complementary bioactivities, such as bakuchiol and salicylic acid, may yield a new class of functional retinoids.
Collapse
|
138
|
Yan T, Wang T, Ma S, Wang K, Wang J, Song J, He W, Bai J, Jin L. The efficacy and safety of preoperative chemotherapy for patients with nonsmall cell lung cancer: A meta-analysis. Indian J Cancer 2017; 54:223-227. [DOI: 10.4103/ijc.ijc_60_17] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
139
|
Yu M, Qi R, Chen C, Yin J, Ma S, Shi W, Wu Y, Ge J, Jiang Y, Tang L, Xu Y, Li Y. Immunogenicity of recombinantLactobacillus casei-expressing F4 (K88) fimbrial adhesin FaeG in conjunction with a heat-labile enterotoxin A (LTAK63) and heat-labile enterotoxin B (LTB) of enterotoxigenicEscherichia colias an oral adjuvant in mice. J Appl Microbiol 2016; 122:506-515. [DOI: 10.1111/jam.13352] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 11/01/2016] [Accepted: 11/13/2016] [Indexed: 12/01/2022]
|
140
|
Zheng Y, Zhang H, Wang Y, Li X, Lu P, Dong F, Pang Y, Ma S, Cheng H, Hao S, Tang F, Yuan W, Zhang X, Cheng T. Loss of Dnmt3b accelerates MLL-AF9 leukemia progression. Leukemia 2016; 30:2373-2384. [PMID: 27133822 DOI: 10.1038/leu.2016.112] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/20/2016] [Accepted: 04/25/2016] [Indexed: 12/11/2022]
Abstract
Acute myeloid leukemia (AML) is a heterogeneous hematopoietic disorder with a poor prognosis. Abnormal DNA methylation is involved in the initiation and progression of AML. The de novo methyltransferases Dnmt3a and Dnmt3b are responsible for the generation of genomic methylation patterns. While DNMT3A is frequently mutated in hematological malignancies, DNMT3B is rarely mutated. Although it has been previously reported that Dnmt3b functions as a tumor suppressor in a mouse model of Myc-induced lymphomagenesis, its function in AML is yet to be determined. In this study, we demonstrated that deletion of Dnmt3b accelerated the progression of MLL-AF9 leukemia by increasing stemness and enhancing cell cycle progression. Gene profiling analysis revealed upregulation of the oncogenic gene set and downregulation of the cell differentiation gene set. Furthermore, loss of Dnmt3b was able to synergize with Dnmt3a deficiency in leukemia development. Taken together, these results demonstrate that Dnmt3b plays a tumor suppressive role in MLL-AF9 AML progression, thereby providing new insights into the roles of DNA methylation in leukemia development.
Collapse
|
141
|
Wang H, Ma S, Xue L, Li Y, Wang J, He X, Zhu Z, Dong C. miR-488 determines coat pigmentation by down-regulating the pigment-producing gene pro-opiomelanocortin. CELLULAR AND MOLECULAR BIOLOGY (NOISY-LE-GRAND, FRANCE) 2016; 62:37-43. [PMID: 27894398 DOI: 10.14715/cmb/2016.62.12.7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Accepted: 11/26/2016] [Indexed: 11/18/2022]
Abstract
Coat color is a key economic trait in wool- and fur-producing animals. Coat color is controlled by complex mechanisms. Pro-opiomelanocortin (POMC) is a gene involved in pigment formation. Previous studies suggested that miR-488 might target the POMC mRNA. This study aimed to determine whether miR-488 could affect coat color by regulating POMC and to explore the regulatory roles of miR-488 on coat color in mammals. A dual fluorescence report vector containing the 3'-UTR of POMC was built to determine whether miR-488 could post-transcriptionally regulate POMC expression. Then, a eukaryotic vector expressing miR-488 was built and transfected into mouse keratinocytes to confirm the regulatory mechanism in vitro. Compared with gray mice, the expression of POMC mRNA was 3.36-fold higher in black mice and 1.29-fold higher in brown mice. The results showed that miR-488 could control mice coat color by combining with the 3'-UTR seed sequence of POMC mRNA to achieve the degradation of POMC mRNA, therefore playing a role in POMC expression. This study revealed the roles of miR-488 in animal coat color and enriches our knowledge about the determination of coat color in mammals.
Collapse
|
142
|
Moran M, Zhao Y, Ma S, Kirova Y, Fourquet A, Chen P, Hoffman K, Hunt K, Wong J, Halasz L, Freedman G, Prosnitz R, Yassa M, Nguyen D, Hijal T, Haffty B, Wai E, Truong P. Radiation Boost for Ductal Carcinoma In Situ After Whole-Breast Radiation Therapy (WBRT) Improves Local Control: Analysis From 10 Pooled Academic Institutions. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
143
|
Zhang S, Zhu L, Xia B, Chen E, Zhao Q, Chen X, Wang L, Jiang H, Ma S. Frequency and abundance of plasma T790M mutation associated with failure patterns of EGFR-mutant NSCLC treated with tyrosine kinase inhibitors. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw363.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
144
|
Ren H, Ferguson K, Wong E, Chow V, Ma S. The consequences of somatic sex chromosomal abnormalities on meiosis and sperm production in infertile men. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
145
|
Shi Y, Li N, Ren H, Guo X, Li Q, Ma S, Wang D. Prognostic role of s-phase kinase-associated protein 2 in breast cancer: A meta-analysis. Indian J Cancer 2016; 52 Suppl 3:E153-7. [PMID: 27453413 DOI: 10.4103/0019-509x.186559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE Emerging evidence has shown that the F-box protein S-phase kinase-associated protein 2 (Skp2) plays an important role in the pathogenesis of breast cancer (BC). Our study aimed to evaluate the prognostic value of Skp2 in BC patients using meta-analysis based on the published studies. MATERIALS AND METHODS Eligible studies were identified by searching the online databases such as PubMed, EMBASE, and Web of Science up to October 2015. Hazard ratios (HRs) with 95% confidence intervals (CIs) were calculated to clarify the correlation between Skp2 expression and indicators of BC clinical outcomes, including overall survival (OS), disease-free survival (DFS), and BC-specific survival. RESULTS In total, nine studies with 1820 BC patients were included for final analysis. The meta-analysis suggested that Skp2 overexpression was associated with poor OS (HR = 2.58, 95% CI: 1.83-3.63, P = 0.000) and poor DFS (HR = 2.12, 95% CI: 1.48-3.05, P = 0.000) in BC patients. CONCLUSIONS This meta-analysis indicates that enhanced Skp2 is an independent prognostic factor for poor cancer survival.
Collapse
|
146
|
Ma S, Henson ES, Chen Y, Gibson SB. Ferroptosis is induced following siramesine and lapatinib treatment of breast cancer cells. Cell Death Dis 2016; 7:e2307. [PMID: 27441659 PMCID: PMC4973350 DOI: 10.1038/cddis.2016.208] [Citation(s) in RCA: 379] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 05/25/2016] [Accepted: 06/01/2016] [Indexed: 12/11/2022]
Abstract
Ferroptosis is an iron-dependent, oxidative cell death, and is distinct from apoptosis, necrosis and autophagy. In this study, we demonstrated that lysosome disrupting agent, siramesine and a tyrosine kinase inhibitor, lapatinib synergistically induced cell death and reactive oxygen species (ROS) in MDA MB 231, MCF-7, ZR-75 and SKBr3 breast cancer cells over a 24 h time course. Furthermore, the iron chelator deferoxamine (DFO) significantly reduced cytosolic ROS and cell death following treatment with siramesine and lapatinib. Furthermore, we determined that FeCl3 levels were elevated in cells treated with siramesine and lapatinib indicating an iron-dependent cell death, ferroptosis. To confirm this, we treated cells with a potent inhibitor of ferroptosis, ferrastatin-1 that effectively inhibited cell death following siramesine and lapatinib treatment. The increase levels of iron could be due to changes in iron transport. We found that the expression of transferrin, which is responsible for the transport of iron into cells, is increased following treatment with lapatinib alone or in combination with siramesine. Knocking down of transferrin resulted in decreased cell death and ROS after treatment. In addition, ferroportin-1 (FPN) is an iron transport protein, responsible for removal of iron from cells. We found its expression is decreased after treatment with siramesine alone or in combination with lapatinib. Overexpression FPN resulted in decreased ROS and cell death whereas knockdown of FPN increased cell death after siramesine and lapatinib treatment. This indicates a novel induction of ferroptosis through altered iron regulation by treating breast cancer cells with a lysosome disruptor and a tyrosine kinase inhibitor.
Collapse
|
147
|
Ma S, Molina M. Two-Sex Branching Processes with Offspring and Mating in a Random Environment. J Appl Probab 2016. [DOI: 10.1239/jap/1261670684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We introduce a class of discrete-time two-sex branching processes where the offspring probability distribution and the mating function are governed by an environmental process. It is assumed that the environmental process is formed by independent but not necessarily identically distributed random vectors. For such a class, we determine some relationships among the probability generating functions involved in the mathematical model and derive expressions for the main moments. Also, by considering different probabilistic approaches we establish several results concerning the extinction probability. A simulated example is presented as an illustration.
Collapse
|
148
|
Louie K, Minor A, Ng R, Poon K, Chow V, Ma S. Evaluation of DNA methylation at imprinted DMRs in the spermatozoa of oligozoospermic men in association with MTHFR C677T genotype. Andrology 2016; 4:825-31. [PMID: 27369467 DOI: 10.1111/andr.12240] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 05/17/2016] [Accepted: 05/20/2016] [Indexed: 11/30/2022]
Abstract
Altered DNA methylation has been previously identified in the spermatozoa of infertile men; however, the origins of these errors are poorly understood. DNA methylation is an epigenetic modification which is thought to play a fundamental role in male germline development. DNA methylation reactions rely on the cellular availability of methyl donors, which are primarily products of folate metabolism, where a key enzyme is methylenetetrahydrofolate reductase (MTHFR). The MTHFR C677T single nucleotide polymorphism (SNP) reduces enzyme activity and may potentially alter DNA methylation processes during germline development. The objective of this study was to determine whether altered DNA methylation in spermatozoa is associated with the MTHFR C677T SNP. DNA methylation was evaluated at the H19, IG-GTL2, and MEST imprinted differentially methylated regions in the spermatozoa of 53 men - 44 oligozoospermic men and nine fertile men with normal sperm parameters via bisulfite sequencing of sperm clones. The 44 infertile men were stratified by severity of oligozoospermia - three normal (>15 million spermatozoa/mL), eight moderate (5-15 million spermatozoa/mL), 23 severe (1-5 million spermatozoa/mL), and 10 very severe (<1 million spermatozoa/mL). MTHFR C677T SNP genotyping was conducted in a subset of 44 peripheral blood samples via restriction fragment length polymorphism. A total of three men - severe oligozoospermic and CT genotype - were found to be altered, which is defined as having ≥50% of their clones altered, where an altered clone was in turn defined as ≥50% of CpGs with incorrect DNA methylation patterns. The incidence of three altered men within the CT subgroup, however, was not significantly higher than the incidence in the CC subgroup. Taken together, altered DNA methylation in spermatozoa was not significantly associated with the MTHFR C677T SNP; however, there was a trend for higher incidence of alterations among severe oligozoospermic infertile men with CT genotypes.
Collapse
|
149
|
Yang B, Ma S, Wang YB, Xu B, Zhao H, He YY, Li CW, Zhang J, Cao YK, Feng QZ. Resveratrol exerts protective effects on anoxia/reoxygenation injury in cardiomyocytes via miR-34a/Sirt1 signaling pathway. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2016; 20:2734-2741. [PMID: 27383330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE In this study, we investigated the regulation of resveratrol (RV) on miR-34a alteration due to ARI and further studied the involvement of miR-34a/Sirt1 signaling pathway in ROS generation and cell survival after ARI. MATERIALS AND METHODS In-vitro anoxia and reoxygenation injury (ARI) model based on rat heart-derived H9c2 cells was established. The expression of miR-34a and Sirt1 in H9c2 cells with or without RV pretreatment was measured. Flow cytometric analysis of intracellular reactive oxygen species (ROS) generation, CCK-8 assay of cell viability and Western blot analysis of active caspase-3 expression were performed to study the role of miR-34a/Sirt1 signaling pathway in RV modulated ARI injury protection. RESULTS Pretreatment with RV substantially restored Sirt1 expression in cardiomyocytes in a dose-dependent manner in the in-vitro ARI model. MiR-34a level was significantly increased due to ARI. But pretreatment with RV significantly suppressed its upregulation. MiR-34a overexpression significantly reduced the effect of RV on restoring Sirt1 expression in ARI. Both miR-34a overexpression and Sirt1 knockdown significantly reduced the effect of RV on reducing ROS generation and also abrogated the effect of RV on enhancing cell viability and reducing cell apoptosis. CONCLUSIONS The present study demonstrated that RV has a suppressive effect on miR-34a upregulation in ARI and the miR-34a/Sirt1 axis is an important signaling pathway modulating the protective effect of RV on cardiomyocytes in ARI. Nonetheless, future in vivo studies are required to validate this mechanism.
Collapse
|
150
|
Noviani M, Thumboo J, Lee C, Soh I, Ma S, Leung Y. SAT0463 The Prevalence of Knee Osteoarthritis Estimated by Validated Screening Questionnaire in The General Population of Singapore. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|