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Li R, Liu Y, Li J, Kragh PM, Callesen H. 98 EFFECT OF ZONA PELLUCIDA ON PORCINE PARTHENOGENETICALLY ACTIVATED EMBRYOS. Reprod Fertil Dev 2012. [DOI: 10.1071/rdv24n1ab98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The need for zona pellucida (ZP) during pre-implantation embryo development is still debated. In porcine parthenogenetically activated (PA) embryos, we have previously shown a different distribution in cell numbers on Day 6 blastocysts cultured with or without ZP (Li et al. 2010 Reprod. Fertil. Dev. 22, 234). In the present study, we expanded this study to include also the timing of early development and the resulting quality and robustness (for vitrification) of porcine PA embryos. Parthenogenetic activation was made first by an electric pulse (1.26 kV cm–1, 80 μs) and then by incubation with 5 μg mL–1 cytochalasin B and 10 μg mL–1 cycloheximide in PZM-3 medium for 4 h. ZP was removed by 3.3 mg mL–1 pronase. Both zona-intact (PAZI) and zona-free (PAZF) embryos were cultured individually for 6 days either in time-lapse incubator (Embryoscope D, Unisense A/S, Aarhus, Denmark) for 15-min observations (Exp. 1; 60 oocytes, 2 replicates) or in standard a incubator for blastocyst quality studies on Day 6 (Exp. 2; 524 oocytes, 11 replicates) or for cryo-tolerance studies with vitrification using Cryotop on Day 4, followed by warming and 2 days further culture (Exp. 3; 449 oocytes, 4 replicates). The timing of morulae was recorded when they completed compaction. Good blastocysts were defined when they expanded to 1.5 times larger than oocytes and formed regular blastocoel cavity with uniform colour and distribution of cells. Timing data were analysed by Student's t-test, while development rates and survival rates were analysed by chi-squared test. Exp. 1: after activation, 42 blastocysts formed on Day 6, during which the timing of development was monitored (Table 1). PAZF embryos developed faster than PAZI, especially during the first 3 cell cycles. Exp. 2: after activation, 212 and 197 blastocysts formed on Day 6 with or without ZP, respectively. Both rates of total blastocysts and good blastocysts of PAZI embryos were significantly higher than those of PAZF embryos (80.1 ± 2.7% vs 69.9 ± 1.1%, 61.9 ± 3.3% vs 49.5 ± 2.5%, respectively), but no difference was found in all blastocyst's cell numbers between PAZI and PAZF (48.2 ± 2.3 and 47.9 ± 3.2, respectively). Exp. 3: after activation, 107 PAZI and 44 PAZF embryos were vitrified on Day 4. More PAZI than PAZF embryos survived (60.8 ± 8.3% vs 30.4 ± 11.9%; P < 0.05). In conclusion, removal of ZP can increase the speed of development of porcine PA embryos, especially at the timing of embryonic genome activation (5-cell stage). Furthermore, the zona pellucida can benefit the blastocyst formation and cryo-tolerance for PA embryos, perhaps by creating a more stable microenvironement.
Table 1.Timing of developmental stages of porcine PA embryos with (PAZI) or without (PAZF) zona pellucida*
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777
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Schmidt M, Winter KD, Li J, Kragh PM, Du Y, Lin L, Liu Y, Li R, Vajta G, Callesen H. 22 MALFORMATIONS FOUND BY AUTOPSY OF CLONED AND TRANSGENIC PIGLETS OF DIFFERENT BREEDS. Reprod Fertil Dev 2012. [DOI: 10.1071/rdv24n1ab22] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Viability of cloned and transgenic piglets is seriously compromised and one obvious reason could be malformations. The aim of the present study was therefore to describe gross pathological conditions in dead pre-weaned piglets born after transfer to Large White (LW) recipients of cloned (LW donor cells) or transgenic (Yucatan or Göttingen donor cells) embryos. Donor cells were fibroblasts and the Göttingen and Yucatan cells were made transgenic with 1 of 5 genes known to dispose for different human diseases. Handmade cloning was used to produce embryos that after 5 to 6 days of in vitro culture were transferred surgically to 108 LW sows 4 days after their natural heat. Of these, 21 sows delivered cloned LW piglets, whereas 17 and 16 sows, respectively, delivered transgenic Göttingen and Yucatan piglets. Stillborn and dead pre-weaned piglets were necropsied and malformations registered. Data were analysed by Fisher's exact test with a significance level of P < 0.05. In the 54 litters, total litter size ranged from 1 to 22 piglets (mean 5.4 ± 0.5) and the overall mortality rate until weaning on day 28 was 59%. Malformations were found in piglets from 38 litters where an average of 35% of the piglets showed malformations (between 8 and 100%). In those litters, 1 to 7 piglets had 1, 2, or several malformations (Table 1). The malformation rate in the autopsied transgenic Göttingen was 58% and in Yucatan 46%; these were significantly higher than in the autopsied cloned LW piglets with 18%. Some of the malformations seemed to be related to breed and/or transgene; for instance, heart malformations were most frequent in Yucatan litters (70%) independent of the transgene, whereas gallbladder and gonad malformations were more frequent in various litters with the same transgene. These results show that the use of cloning in pigs results in a considerable loss of piglets due to malformations and transgenic transformation of the cells used for cloning superimpose on this problem. In combination, these elements could seriously compromise the use of pigs as a model for human diseases and the choice of breeds and also transgenes for this kind of work should be considered carefully. However, further improvements in production of cloned/transgenic embryos may ultimately reduce the incidence of malformations.
Table 1.Number of malformations in 54 litters of cloned or transgenic piglets
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778
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Isom SC, Stevens JR, Li R, Spate LD, Spollen WG, Prather RS. 143 TRANSCRIPTIONAL PROFILING BY HIGH-THROUGHPUT SEQUENCING OF PORCINE PRE- AND PERI-IMPLANTATION EMBRYOS. Reprod Fertil Dev 2012. [DOI: 10.1071/rdv24n1ab143] [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
Significant embryo mortality occurs at or around the time of implantation or attachment in virtually all mammalian species studied to date, even in naturally conceived embryos. Embryos resulting from assisted reproductive technologies (ART) are even more susceptible to peri-implantation failure. Herein we describe our effort to characterise the transcriptomes of embryonic disc (ED) and trophoblast (TE) cells from porcine embryos derived from AI, IVF, parthenogenetic oocyte activation (PA) and somatic cell nuclear transfer (NT) on Days 10, 12 and 14 of gestation. The IVF, PA and somatic cell NT embryos were generated using in vitro–matured oocytes, cultured overnight in vitro and then transferred at the 1- to 2-cell stage into appropriately synchronized recipient gilts. On the appropriate collection day, embryos were flushed from the uterus and ED was separated from TE by mechanical dissection. Double-stranded cDNA from the collected samples was sequenced using the GAII platform from Illumina (San Diego, CA, USA). The resulting sequencing reads were aligned to a custom swine transcriptome database (see Isom et al. 2010). A generalized linear model was fit for each of 41 693 genomic regions, for ED and TE samples separately, accounting for embryo type, gestation day and their interaction and using total lane read count as a normalizing offset. Genes with significant embryo type differences (controlling the false discovery rate at 0.10) were subsequently tested for differences between IVF and each of AI, PA and NT. Those genes with significant post hoc differences (either up- or down-regulated compared with IVF) were characterised in terms of gene ontologies and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways using a gene set enrichment test. Bone morphogenetic protein signalling was down-regulated (KEGG; P = 0.0099; adjusted to control for FDR at 0.05) in the ED of IVF embryos when compared with AI embryos. In TE cells from IVF embryos, ubiquitin-mediated proteolysis and ErbB signalling (adj P = 0.031 for both pathways) were aberrantly regulated when compared with AI embryos. Of particular interest is the observation that expression of genes involved in chromatin modification (GO:BiologicalProcess; q-value = 0.00005) and epigenetic regulation of transcription (q = 0.00007) was very significantly disrupted in inner cell mass cells from NT embryos compared with IVF embryos. Surprisingly, no such disruption of the epigenetic machinery was observed in the TE cells from NT embryos. In summary, we have used high-throughput sequencing technologies to compare gene expression profiles of various ART embryo types during peri-implantation development. We expect that these data will provide important insight into the root causes of (and possible opportunities for mitigation of) suboptimal development of embryos derived from ART.
Funding was received from NIH R01 RR013438 and Food for the 21st Century (RSP) and the Utah Agricultural Experiment Station (UTA00151 and UTA00560 for S. C. Isom and J. R. Stevens, respectively).
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779
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Li R. 3.035 TGF-β1 POLYMORPHISMS AND RISK OF PARKINSON'S DISEASE IN A HAN CHINESE POPULATION. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70771-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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780
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Bowers LW, Brenner AJ, Li R, Tekmal RR, deGraffenried LA. P4-02-08: Obesity-Induced Aromatase Expression in the Breast Microenvironment Promotes Estrogen Receptor Activity Independent of Circulating Estradiol Levels. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p4-02-08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Epidemiological studies indicate that obesity increases the risk of postmenopausal breast cancer by approximately 50%. In the past, researchers have hypothesized that elevated estrogen synthesis by the peripheral adipose tissue may be the principal mediator of breast tumorigenesis in this population, which primarily develops estrogen receptor alpha (ERα) positive breast cancer. However, obesity is also accompanied by an elevation in growth factor and cytokine signaling, and these pathways have been linked to tumorigenesis. In addition, certain growth factor and cytokine family members can promote aromatase expression in both the epithelial and stromal tumor compartments. Consequently, we hypothesized that obesity increases the risk of postmenopausal breast cancer via elevated aromatase expression and/or activity in the local mammary tissue.
To test our hypothesis, we investigated how ERa activity in mammary epithelial cells was influenced by adipose stromal cells (ASC) cultured under obesity-associated conditions, including high cell density and exposure to elevated levels of circulating growth factors and cytokines. For the latter condition, sera was obtained from postmenopausal women, pooled by BMI category (lean: 18.5−24.9; obese: ≥30), and applied to the ASC, which were originally derived from women undergoing reduction mammoplasty. High ASC density was achieved via the protocol previously published by Dr. Li. Preliminary data indicated that both elevated cell density and sera from obese postmenopausal women induces greater aromatase expression in ASC, indicating that multiple factors may be contributing to the increased local aromatase expression seen with obesity. We are currently exploring the signaling pathways responsible for obesity's upregulation of ASC aromatase expression and will present these results at the meeting. Intriguingly, exposure to conditioned media from both the high density and obese sera-exposed ASC enhanced ERa activity in MCF-7 mammary epithelial cells, independent from exogenous estradiol but dependent on the presence of androgens, suggesting an important role for the aromatase enzyme in this observation. To expand on this finding, we plan to investigate the effect of ASC conditioned media on different markers of cancer aggression, including proliferation and survival, and assess the degree to which these effects depend on estradiol. Through further examination of obesity's impact on signaling pathways in both the epithelial and stromal tumor compartments, we ultimately hope to identify more effective chemopreventive and therapeutic regimens for the high-risk obese postmenopausal population.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P4-02-08.
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781
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Zhang J, Jin Z, DU Q, Li R, Yao F, Huang B, Xu N, Xu L, Luo X, Liu X. Analysis of altered proteins related to blast crisis in chronic myeloid leukemia by proteomic study. Int J Lab Hematol 2011; 34:267-73. [PMID: 22145801 DOI: 10.1111/j.1751-553x.2011.01389.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Chromic myeloid leukemia (CML) blast crisis (BC) and imatinib (IM) resistance is a significant barrier to the effective treatment of the disease. METHODS Expression profiles of differential proteins were identified, and new biomarkers or pathways related to BC in CML were screened through proteomic analysis. Total proteins from primary bone marrow cells of CML patients in chronic phase (CP) and BC were separated via two-dimensional (2D) polyacrylamide gel electrophoresis and then analyzed by imagemaster 5.0 software to detect differential protein spots which were already identified by mass spectrometry. Based on the variation of the whole expression profile, some key proteins were picked out for Western blot to confirm the accuracy of proteomics data. Moreover, related signal pathways involving those proteins were investigated. RESULTS The result indicated that thirteen protein points between CML-CP and CML-BC were successfully determined. Results from Western blot of RhoA, hnRNPK, ANXA1, PSMB4, and LTA4H were similar to those from 2D polyacrylamide gel electrophoresis. Most of those proteins were involved in the proteosome pathway and the small G-protein pathway. CONCLUSION A group of proteins associated with BC can be obtained and the result of this study might provide clues for further research.
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782
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Rao WL, Li F, Zuo RJ, Li R. First Report of Little cherry virus 2 in Flowering and Sweet Cherry Trees in China. PLANT DISEASE 2011; 95:1484. [PMID: 30731776 DOI: 10.1094/pdis-10-10-0766] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Many viruses infect Prunus spp. and cause diseases on them. During a survey of stone fruit trees in 2008 and 2009, flowering cherry (Prunus serrulata) and sweet cherry (P. avium) trees with foliar chlorosis and reddening, stem deformity, and tree stunting were observed in private orchards in Anning and Fumin counties of Yunnan Province. Some sweet cherry trees with severe symptoms yielded small and few fruits and had to be removed. Leaf samples were collected from 68 flowering cherry and 30 sweet cherry trees, either symptomatic or asymptomatic, from private orchards and community gardens in Kunming and counties Anning, Chenggong, Fumin, Jinning, Ludian and Yiliang. Total nucleic acids were extracted with a CTAB extraction method and tested by reverse transcription (RT)-PCR assay using virus-specific primers. Little cherry virus 2 (LChV-2), Cherry virus A (CVA), Prunus necrotic ringspot virus (PNRSV), and Prune dwarf virus (PDV) were detected and infection rates were 68.4, 16.3, 9.2, and 7.1%, respectively. Infection of LChV-2 was common in all counties except Ludian where the orchards were healthy. Of 68 infected trees, 29 were found to be infected with LChV-2 and CVA, PDV or PNRSV. LChV-2 was detected in this study by RT-PCR using a pair of novel primers, LCV2-1 (5'-TTCAATATGAGCAGTGTTCCTAAC-3') and LCV2-4 (5'-ACTCGTCTTGTGACATACCAGTC-3'), in 59 flowering cherry (87%) and 8 sweet cherry (27%) trees, respectively. The primer pair was designed according to alignment of three available LChV-2 sequences (GenBank Nos. NC_005065, AF416335, and AF333237) to amplify the partial RNA-dependent RNA polymerase gene (ORF1b) of 781 bp. The amplicons of selected samples (Anning26 and Yiliang60) were sequenced directly and sequences of 651 bp (GenBank No. HQ412772) were obtained from both samples. Pairwise comparisons and phylogenetic analysis of the sequences show that the two isolates are identical to one another and share 92 to 96% at the amino acid (aa) sequence level to those of other isolates available in the GenBank database. The sequence data confirm that these isolates are a strain of LChV-2 and genetic variation among different strains is relatively high (2). Biological and serological assays are not available for the LChV-2 detection; therefore, the LChV-2 infections of these trees were further confirmed by RT-PCR using primer pair LCV2-5 (5'-TGTTTGTGTCATGTTGTCGGAGAAG-3') and LCV2-6 (5'-TGAATACCCGAGAACAAGGACTC-3'), which amplified the helicase domain (ORF1a) of ~451 bp. The amplicons from samples Anning26 and Yiliang60 were cloned and sequenced. The 408-bp sequences (excluding primer sequences) were 92 to 98% identical at the aa sequence level to those of other isolates, confirming again their viral origin. LChV-2 (genus Ampelovirus, family Closteroviridae) (4) has been associated with little cherry disease (LChD), a widespread viral disease of sweet and sour cherries (1,3). The virus is transferred between geographic areas mainly by propagated materials. Ornamental and sweet cherries are important crops in China and LChD has the potential to cause significant economic losses. Thus, certified clean stock should be used to establish new orchards. To our knowledge, this is the first report of LChV-2 in cherries in China. References: (1) N. B. Bajet et al. Plant Dis. 92:234, 2008. (2) W. Jelkmann et al. Acta Hortic. 781:321, 2008. (3) B. Komorowska and M. Cieslińska, Plant Dis. 92:1366, 2008. (4) M. E. Rott and W. Jelkmann. Arch. Virol. 150:107, 2005.
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783
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Li R, Yang W, Zhang J, Hirankarn N, Pan HF, Mok CC, Chan TM, Wong RWS, Mok MY, Lee KW, Wong SN, Leung AMH, Li XP, Avihingsanon Y, Lee TL, Ho MHK, Lee PPW, Wong WHS, Wong CM, Ng IOL, Yang J, Li PH, Zhang Y, Zhang L, Li W, Baum L, Kwan P, Rianthavorn P, Deekajorndej T, Suphapeetiporn K, Shotelersuk V, Garcia-Barceló MM, Cherny SS, Tam PKH, Sham PC, Lau CS, Shen N, Lau YL, Ye DQ. Association of CD247 with systemic lupus erythematosus in Asian populations. Lupus 2011; 21:75-83. [PMID: 22004975 DOI: 10.1177/0961203311422724] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Systemic lupus erythematosus (SLE) is a prototypic autoimmune disease with complex genetic inheritance. CD247 (CD3Z, TCRZ) plays a vital role in antigen recognition and signal transduction in antigen-specific immune responses, and is known to be involved in SLE pathogenesis. Weak disease association was reported for genetic variants in this gene in Caucasian studies for SLE, Crohn's disease and systemic sclerosis, but its role as a genetic risk factor was never firmly established. METHODS In this study, using a collection of 612 SLE patients and 2193 controls of Chinese ethnicity living in Hong Kong in a genome-wide study, single nucleotide polymorphisms (SNPs) in and around CD247 were identified as being associated with SLE. The two most significant SNPs in this locus were selected for further replication using TaqMan genotyping assay in 3339 Asian patients from Hong Kong, Mainland China, and Thailand, as well as 4737 ethnically and geographically matched controls. RESULTS The association of CD247 with SLE in Asian populations was confirmed (rs704853: odds ratio [OR] = 0. 81, p = 2.47 × 10(-7); rs858543: OR = 1.10, p = 0.0048). Patient-only analysis suggested that rs704853 is also linked to oral ulcers, hematologic disorders and anti-double-stranded DNA (dsDNA) antibody production. CONCLUSION A significant association between variants in CD247 and SLE was demonstrated in Asian populations. Understanding the involvement of CD247 in SLE may shed new light on disease mechanisms and development of new treatment paradigms.
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784
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Xinyun C, Zhi Z, Bin Z, Li R, Yucheng C, Yafei Y, Tingjie Z, Shengfu L. Effects of cardiotrophin-1 on differentiation and maturation of rat bone marrow mesenchymal stem cells induced with 5-azacytidine in vitro. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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785
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Jayaramudu J, Maity A, Sadiku E, Guduri B, Varada Rajulu A, Ramana CH, Li R. Structure and properties of new natural cellulose fabrics from Cordia dichotoma. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2011.06.071] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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786
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Lewis J, Li R, Cervino L, Jiang S. Reliability and Accuracy In Real-time Target Localization With Diaphragm-assisted Tumor Tracking. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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787
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Li R, Yang Y, Song L, Wang Z. Atrial myocardial velocities in normal fetuses assessed by quantitative tissue velocity imaging. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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788
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Guo T, Zhang L, Li R, Luo Z, Zhao L. The advanced experience in combining Biv-pacing with AVN-first for improving efficiency from CRT. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300867.523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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789
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Bergom C, Hauser A, Lorimer EL, Li R, Mackinnon AC, Williams CL. SmgGDS splice variants: Potential novel targets for breast cancer therapeutics. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.27_suppl.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
225 Background: Breast cancer malignancy is promoted by the small GTPases K-Ras, Rap1, RhoA, and Rac1. We recently reported that the activity of these GTPases is regulated by two splice variants of SmgGDS, named SmgGDS-558 and SmgGDS-607. SmgGDS is overexpressed in lung and prostate cancer, but its role in breast cancer is unknown. Here we examine whether SmgGDS splice variants are expressed in breast cancer and promote breast cancer malignancy. Methods: Immunohistochemical staining for SmgGDS was performed on archival human breast tumors (N=183) and normal breast tissue (N=22). Immunoblotting was used to detect SmgGDS splice variants in human breast cancer cell lines. siRNAs that silence different SmgGDS splice variants were used to examine the effects of SmgGDS knockdown on breast cancer cell spreading, cell proliferation via [3H]thymidine uptake, anchorage-independent cell growth using soft agar colony assays, and NF-kB activation using luciferase reporter assays. Results: SmgGDS expression was detected in >65% of DCIS and invasive lobular and ductal carcinoma, and in 100% of metastatic tumors, but was detected in only 18% of normal breast tissue specimens (p<0.01). All tested cell lines expressed both SmgGDS splice variants. Silencing SmgGDS-558 or SmgGDS-607 with siRNA significantly diminished cell proliferation (100±2.0 vs. 11.3±1.0 vs. 50.5±2.2, p<0.05) in MCF-7 cells, with similar results in MDA-MB-231 and T47D cells. MCF-7 soft agar colony formation was significantly decreased 71% and 49% when SmgGDS-558 or SmgGDS-607 was silenced. MCF-7 cell spreading was promoted by silencing SmgGDS-558, but not SmgGDS-607. NF-kB activation was also decreased by 30% in resting and TNF-α-treated MCF-7 and MDA-MB-231 cells by silencing either splice variant. Conclusions: SmgGDS is disproportionally expressed in human breast cancers. Reduction of SmgGDS-558 and SmgGDS-607 levels dramatically reduced breast cancer cell proliferation, soft agar colony formation, and NF-kB activation. Our results indicate that SmgGDS splice variants regulate breast cancer malignancy, most likely through their regulation of small GTPases. This study identifies SmgGDS splice variants as novel therapeutic targets in breast cancer.
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790
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Yan X, Wang X, Wang Z, Sun S, Chen G, He Y, Mo JQ, Li R, Jiang P, Lin Q, Sun M, Li W, Bai Y, Zhang J, Zhu Y, Lu J, Yan Q, Li H, Guan MX. Maternally transmitted late-onset non-syndromic deafness is associated with the novel heteroplasmic T12201C mutation in the mitochondrial tRNAHis gene. J Med Genet 2011; 48:682-90. [DOI: 10.1136/jmedgenet-2011-100219] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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791
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Li S, Guo J, Wu J, Sun Z, Han M, Shan S, Deng Z, Yang B, Weisel R, Li R. 180 microrna-17 Accelerates Cardiac Matrix Remodeling After Myocardial Infarction by Targeting Timp-1 and Timp-2. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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792
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Li S, Sun Z, Brunt K, Weisel R, Li R. 401 Cardiac-resident bone marrow stem cells govern repair after infarction in aged mice. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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793
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Jiang N, Zhang X, Zheng X, Chen D, Zhang Y, Siu LKS, Xin HB, Li R, Zhao H, Riordan N, Ichim TE, Quan D, Jevnikar AM, Chen G, Min W. Targeted gene silencing of TLR4 using liposomal nanoparticles for preventing liver ischemia reperfusion injury. Am J Transplant 2011; 11:1835-44. [PMID: 21794086 DOI: 10.1111/j.1600-6143.2011.03660.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
RNAi-based therapy is a promising strategy for the prevention of ischemia-reperfusion injury (IRI). However, systemic administration of small interfering RNA (siRNA) may cause globally nonspecific targeting of all tissues, which impedes clinical use. Here we report a hepatocyte-specific delivery system for the treatment of liver IRI, using galactose-conjugated liposome nanoparticles (Gal-LipoNP). Heptocyte-specific targeting was validated by selective in vivo delivery as observed by increased Gal-LipoNP accumulation and gene silencing in the liver. Gal-LipoNP TLR4 siRNA treatment resulted in a significant decrease of serum alanine transferase (ALT) and aspartate transaminase (AST) in a hepatic IRI model. Histopathology displayed an overall reduction of the injury area in the Gal-LipoNP TLR4 siRNA treated mice. Additionally, neutrophil accumulation and lipid peroxidase-mediated tissue injury, detected by MPO, MDA and ROS respectively, were attenuated after Gal-LipoNP TLR4 siRNA treatment. Moreover, therapeutic effects of Gal-LipoNP TLR4 siRNA were associated with suppression of the inflammatory cytokines IL-1 and TNF-α. Taken together, this study is the first demonstration of liver IRI treatment using liver-specific siRNA delivery.
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794
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Mihic A, Miyagi Y, Gagliardi M, Li S, Tsukashita M, Weisel R, Keller G, Li R. 398 Enhanced in vivo cardiac tissue formation by cyclic stretching of patches seeded with human embryonic stem cell-derived cardiomyocytes. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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795
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Liu R, He P, Li Z, Li R. Simultaneous Determination of 16 Sulfonamides in Animal Feeds by UHPLC-MS-MS. J Chromatogr Sci 2011; 49:640-6. [DOI: 10.1093/chrsci/49.8.640] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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796
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Na LX, Zhang YL, Li Y, Liu LY, Li R, Kong T, Sun CH. Curcumin improves insulin resistance in skeletal muscle of rats. Nutr Metab Cardiovasc Dis 2011; 21:526-533. [PMID: 20227862 DOI: 10.1016/j.numecd.2009.11.009] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 10/19/2009] [Accepted: 11/19/2009] [Indexed: 01/26/2023]
Abstract
BACKGROUND AND AIMS Curcumin has been reported to lower plasma lipids and glucose in diabetic rats, and to decrease body weight in obese rats, which may partly be due to increased fatty acid oxidation and utilization in skeletal muscle. METHODS AND RESULTS Diabetic rats induced by high-fat diet plus streptozotocin (STZ, 30 mg/kg BW) were fed a diet containing 50, 150, or 250 mg/kg BW curcumin for 7 wk. Curcumin dose-dependently decreased plasma lipids and glucose and the dose 150 mg/kg BW appeared to be adequate to produce a significant effect. Curcumin supplementation reduced glucose and insulin tolerance measured as areas under the curve. L6 myotubes were treated with palmitate (0.25 mmol/L) in the presence of different levels of curcumin for 24 h in our in vitro experiment. Curcumin at 10 μmol/L was adequate to cause a significant increase in 2-deoxy-[(3)H]d-glucose uptake by L6 myotubes. Curcumin up-regulated expression of phosphorylated AMP-activated protein kinase (AMPK), CD36, and carnitine palmitoyl transferase 1, but down-regulated expression of pyruvate dehydrogenase 4 and phosphorylated glycogen synthase (GS) in both in vivo and in vitro studies. Moreover, curcumin increased phosphorylated acetyl COA carboxylase in L6 myotubes. The effects of curcumin on these enzymes except for GS were suppressed by AMPK inhibitor, Compound C. LKB1, an upstream kinase of AMPK, was activated by curcumin and inhibited by radicicol, an LKB1 destabilizer. CONCLUSION Curcumin improves muscular insulin resistance by increasing oxidation of fatty acid and glucose, which is, at least in part, mediated through LKB1-AMPK pathway.
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797
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Auyeung M, Tsoi TH, Tang WK, Cheung CM, Lee CN, Li R, Yeung E. Impulse control disorders in Chinese Parkinson's disease patients: the effect of ergot derived dopamine agonist. Parkinsonism Relat Disord 2011; 17:635-7. [PMID: 21705258 DOI: 10.1016/j.parkreldis.2011.06.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 05/25/2011] [Accepted: 06/02/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVE We studied the prevalence and related risk factors of impulse control disorders in Chinese Parkinson's disease patients. METHOD We screened all non-demented Parkinson's disease patients attending our Parkinson's disease clinic from August 2009 to March 2010. The clinical characteristics of patients with impulse control disorders and those without were compared. RESULTS Of the 213 PD subjects screened, 15 (7.0%) with impulse control disorders were identified. Fourteen of these subjects were on both a dopamine agonist and Levodopa, and one was on Levodopa alone. Of the fourteen subjects on both a dopamine agonist and Levodopa, eleven were on bromocriptine and Levodopa; 10.5% of the subjects exposed to bromocriptine had impulse control disorder. Upon multivariate analysis, dose of dopamine agonist used, young age at onset of Parkinson's disease and a history of anxiety or depression were independent predictors for developing impulse control disorders. CONCLUSIONS 7% of our Chinese PD subjects had impulse control disorders. When young Parkinson's disease patients with a history of anxiety or depression are treated with high dose of DA, they are at risk of developing impulse control disorders.
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798
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Deng S, Hu H, Abliz P, Wan Z, Wang A, Cheng W, Li R. A random comparative study of terbinafine versus griseofulvin in patients with tinea capitis in Western China. Mycopathologia 2011; 172:365-72. [PMID: 21701791 DOI: 10.1007/s11046-011-9438-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Accepted: 06/08/2011] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To compare the efficacy and safety of terbinafine with griseofulvin in the treatment of tinea capitis in Western China. METHODS Children (2-14 years of age) with clinically diagnosed and potassium hydroxide microscopy-confirmed tinea capitis were randomized into three groups: group GRI4 received 4 weeks of griseofulvin; group TBF2 received 2 weeks of terbinafine; and Group TBF4 received 4 weeks of terbinafine. Clinical and mycological evaluations were done in 0, 2, 4, and 8 weeks and 1 year after therapy started. The isolated pathogenic fungi were evaluated for in vitro susceptibility by detecting the minimal inhibitory concentration (MIC) against terbinafine, griseofulvin, itraconazole, and ketoconazole. RESULTS The clinical effectiveness rate of GRI4, TBF2, and TBF4 were 100% (95% CI-confidence interval: 82-100%), 96.3% (95% CI: 81-100%), and 100%(95% CI: 85-100%), respectively, at week 8 and 100% after 1 year for the 3 groups; clinical cure rates were 84.2%(95% CI: 77-99%), 85.2%(95% CI: 71-98%), and 78.3%(95% CI: 61-95%), respectively, at week 8 and 100% after 1 year for all agents; mycological cure rates were 100%(95% CI: 74-100%), 95.0%(95% CI: 74-100%), and 94.1%(95% CI: 50-93%) at week 8 and 100% after 1 year for the 3 groups. In vitro, all patient-derived cultures were sensitive to the four antifungal agents. CONCLUSION Data from the clinical trial and in vitro antifungal activity indicated that terbinafine is efficacious and well tolerated in the treatment for Trichophyton infections (T. violaceum; Arthroderma vanbreuseghemii; and T. tonsurans) of the scalp, i.e., a 2- to 4-week course of terbinafine is as effective as a 4-week course of griseofulvin; in fact, a 2-week course of terbinafine is sufficient. Terbinafine is an effective alternative to griseofulvin against tinea capitis of Trichophyton infections.
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799
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Liu D, Chi Z, Cao Y, Li R, Han C. SU-E-T-855: The Correlation Analysis of IMRT Dosimetry Errors and Parameters of Beams. Med Phys 2011. [DOI: 10.1118/1.3612819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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800
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Li R, Fahimian B, Xing L. TU-C-214-06: A Nonparametric Bayesian Approach to Real-Time 3D Tumor Localization via Monoscopic Xray Imaging during Treatment Delivery. Med Phys 2011. [DOI: 10.1118/1.3613138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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