101
|
Nanfang L, Hong X, Zhitao Y, Hongmei W. e0168 The relationship study between T3593C polymorphism of ENaC gene with essential hypertension and serum electrolytes in Xinjiang Kazakhs. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
102
|
Jing Y, Nanfang L, Ling Z, Liang S, Nei C, Yingchun W, Hong X. e0025 Aldehyde dehydrogenase-2 G1951A gene polymorphism and obstructive sleep apnoea syndrome in male drinkers. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
103
|
Zou K, Hong X, Keefer D, Zhu J. Deposition of high-quality HfO2 on graphene and the effect of remote oxide phonon scattering. PHYSICAL REVIEW LETTERS 2010; 105:126601. [PMID: 20867662 DOI: 10.1103/physrevlett.105.126601] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Indexed: 05/22/2023]
Abstract
We demonstrate atomic layer deposition of high-quality dielectric HfO2 films on graphene and determine the magnitude of remote oxide surface phonon scattering in dual-oxide structures. The carrier mobility in these HfO2-covered graphene samples reaches 20,000 cm2/V s at low temperature. Distinct contributions to the resistivity from surface optical phonons in the SiO2 substrate and the HfO2 overlayer are isolated. At 300 K, surface phonon modes of the HfO2 film centered at 54 meV limit the mobility to approximately 20,000 cm2/V s.
Collapse
|
104
|
Kong B, Michalski CW, Hong X, Valkovskaya N, Rieder S, Abiatari I, Streit S, Erkan M, Esposito I, Friess H, Kleeff J. AZGP1 is a tumor suppressor in pancreatic cancer inducing mesenchymal-to-epithelial transdifferentiation by inhibiting TGF-β-mediated ERK signaling. Oncogene 2010; 29:5146-58. [PMID: 20581862 DOI: 10.1038/onc.2010.258] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Epithelial-to-mesenchymal transdifferentiation (EMT) mediated by transforming growth factor-β (TGF-β) signaling leads to aggressive cancer progression. In this study, we identified zinc-α2-glycoprotein (AZGP1, ZAG) as a tumor suppressor in pancreatic ductal adenocarcinoma whose expression is lost due to histone deacetylation. In vitro, ZAG silencing strikingly increased invasiveness of pancreatic cancer cells accompanied by the induction of a mesenchymal phenotype. Expression analysis of a set of EMT markers showed an increase in the expression of mesenchymal markers (vimentin (VIM) and integrin-α5) and a concomitant reduction in the expression of epithelial markers (cadherin 1 (CDH1), desmoplakin and keratin-19). Blockade of endogenous TGF-β signaling inhibited these morphological changes and the downregulation of CDH1, as elicited by ZAG silencing. In a ZAG-negative cell line, human recombinant ZAG (rZAG) specifically inhibited exogenous TGF-β-mediated tumor cell invasion and VIM expression. Furthermore, rZAG blocked TGF-β-mediated ERK2 phosphorylation. PCR array analysis revealed that ZAG-induced epithelial transdifferentiation was accompanied by a series of concerted cellular events including a shift in the energy metabolism and prosurvival signals. Thus, epigenetically regulated ZAG is a novel tumor suppressor essential for maintaining an epithelial phenotype.
Collapse
|
105
|
Blatman KSH, Kumar R, Hong X, Burdea L, Gupta S, Pongracic J, Wang X. Cord Blood IgE And Possible In Utero Effects Of Birth Order. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
106
|
Hong X, Tsai H, Wang G, Pearson C, Ortiz K, Kumar R, Bauchner H, Schleimer R, Pongracic J, Wang X. Genetic Determinants of Food Sensitization in Early Childhood: A Prospective Birth Cohort Study. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
107
|
Chen S, Hong X, Harris C. Regression based D-optimality experimental design for sparse kernel density estimation. Neurocomputing 2010. [DOI: 10.1016/j.neucom.2009.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
108
|
Ou Z, Wang L, Hong X, Shen Z, Shao Z. Overexpression or Lack of beta 2-Adrenergic Receptor Correlate with Progression of Breast Cancer. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-4165] [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
Background: Recent studies showed that stress can modulate biological behavior of ovarian carcinoma through adrenergic receptors. Since both nonselective beta-adrenergic receptor antagonist propranolol and selective beta 2-adrenergic receptor (b2AR) antagonist ICI 118,551 instead of b1AR antagonist atenolol could eliminate most of the effects, b2AR is accordingly regarded as the key molecule. In this study, we investigated the role of b2AR in breast cancer. Material and Methods: Gene expression of b2AR was analyzed by RT-PCR in human breast cancer cell lines MDA-MB-231, MDA-MB-435, MDA-MB-468, MCF-7, T47D, BT-549, HCC1937, BCaP-37 and normal mammary epithelial-like cell line HBL-100. b2AR cDNA was transfected into MDA-MB-435 cells. Protein level of b2AR was analyzed by immunohistochemistry in clinical samples, including 25 normal human breast or benign disease breast tissues and 202 breast cancer tissues. Results: b2AR was detected in majority of breast cancer cell lines, except for MDA-MB-435, MCF-7 and T47D, and all of normal or benign disease breast tissues. Both nonselective beta-adrenergic receptor agonist norepinephrine (NE) and selective b2AR agonist terbutaline promoted proliferation and invasion of spontaneous b2AR-positive MDA-MB-231 cells and transfectant MDA-MB-435-b2AR cells, these effects were completely inhibited by selective b2AR antagonist ICI 118,551. In the breast cancer patients, 125 samples (61.9%) expressed b2AR weakly or moderately just as normal breast or benign diseases tissue, and 43 (21.3%) presented significantly stronger b2AR expression, while no b2AR staining was found in other 34 samples (16.8%). Higher expression or lack of b2AR were associated with axillary lymph nodes metastasis and poor disease free survival (DFS). Discussion: Based on our preliminary results, the breast cancer patients could be classified into three subgroups: b2AR “normal”, high expression and negative groups. Overexpression or lack of b2AR associated with metastasis and clinical prognosis in breast cancer. Obviously, abnormal expression of b2AR may influence the outcome of breast cancer.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 4165.
Collapse
|
109
|
Phoenix K, Hong X, Tannenbaum S, Claffey K. Expression of the Cancer Stem Cell Marker ALDH1A1 in Primary Breast Cancer: A Mechanism for Chemotherapy Resistance. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-1135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Aldehyde dehydrogenase 1 (ALDH1) has been identified as a marker of breast cancer stem cells, and ALDH1 expression in primary breast tumors has been associated with resistance to chemotherapy and poor prognosis. ALDH1 is an enzyme that can detoxify reactive aldehyde compounds; however the mechanism of ALDH1 chemotherapy resistance and its promotion of the breast cancer stem cell phenotype is unclear. Materials and Methods: Illumina cDNA array was performed on primary breast tumors that were snap-frozen, and RNA was isolated from dense, viable tumor regions. Samples were normalized by rank-invariant method and gene expression was analyzed. Immunohistochemistry was performed for ALDH1A1 on initial and post-neoadjuvant tumor samples from patients who have undergone six cycles of chemotherapy. Clinical data including age, tumor pathology, lymph node status, and response to neoadjuvant therapy were available for analysis. Human breast cancer cell lines (MCF-7 and MDA-MB-468) were treated with increasing doses of retinoic acid (RA) with and without the retinoic acid receptor alpha antagonist, Ro 41-5253. Effects on cell proliferation and signal transduction pathways were assessed. Results: The expression of ALDH1A1 and/or ALDH1A3 isoform mRNA was found to be present in primary human breast tumors. The majority of these cases were noted as triple negative or Her-2 positive tumors. Evaluation of RA receptor expression revealed repressed RAR beta levels in all tumors, whereas RAR alpha expression was retained. Observations of patient tumor samples (pre and post neoadjuvant chemotherapy treatment) demonstrated high ALDH1A1 expression in tumor and stromal cell compartments. The expression was predominant in partial and non-responders to the neoadjuvant therapy. Interestingly, the tumor from a partial responder was converted to extremely high expresser of ALDH1A1 post-neoadjuvant therapy indicating a positive survival selection. Since ALDH1A1 can convert retinaldehyde to retinoic acid, breast cancer cell lines were treated with all-trans RA and responded with a significant decrease in cell proliferation. This effect was partially attenuated by pre-treatment with the RAR alpha antagonist, Ro 41-5253. Importantly, RA treatment of MCF-7 cells repressed MAPK signaling, which was also attenuated by pre-treatment with Ro 41-5253. Discussion: The observations from this study suggest that the expression of the breast cancer stem cell marker, ALDH1A1 on tumor cells or in tumor-associated stromal cells can provide a mechanism for survival of cancer during chemotherapy treatment. The conversion of therapeutic oxidant compounds to retinoic acid by ALDH1 may lead to increased RAR alpha signaling and suppression of proliferation. The suppression of proliferation correlates well with chemotherapy resistance in these neoadjuvant cases. This data demonstrates a possible mechanism for ALDH1 promotion of tumor cell survival under chemotherapy and suggests that treatment with RAR alpha antagonists may promote tumor cell susceptibility to current treatment modalities and improve the therapeutic window for primary, metastatic and chemo-refractory breast cancer.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 1135.
Collapse
|
110
|
Zhu F, Tao S, Xu X, Ying Y, Hong X, Zhu H, Yan L. Distribution of ABO blood group allele and identification of three novel alleles in the Chinese Han population. Vox Sang 2009; 98:554-9. [PMID: 20003128 DOI: 10.1111/j.1423-0410.2009.01291.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND The ABO blood group system is clinically important in blood transfusion. The molecular characterization of ABO blood group has clinical and anthropological importance. Here, we determined the ABO alleles distribution and identified three novel alleles in the Chinese Han population. STUDY DESIGN AND METHODS Four hundred and seventeen Chinese Han individuals were determined by standard serologic techniques for the ABO blood group phenotypes. The ABO genotypes and alleles were analysed by polymerase chain reaction sequence-based typing (PCR-SBT) for sequencing exon 6 to 7 of the ABO gene. The polymorphisms of intron 5 and 6 of the ABO gene were also analysed by PCR-SBT. The two haplotypes including new alleles were separated by a Dynabeads M-270 Streptavidin protocol. RESULTS All ABO genotypes of the samples were consistent with the phenotypes. Fourteen alleles were identified based on the nucleotide sequences of exon 6 and 7, with five common alleles (A101, A102, B101, O01 and O02), six known rare alleles (A205, B110, O04, O05, O07 and O50) and three novel alleles (B112, CisAB06 and 061). The three new alleles appeared with the frequencies of 0.12%, 0.12% and 0.36%, respectively. CONCLUSION The detailed frequencies distribution of ABO alleles was studied in the Chinese Han population. We identified 14 alleles, including 3 novel alleles.
Collapse
|
111
|
Xu X, Zhu F, Ying Y, Tao S, Liu Y, Hong X, Yan L. Simultaneous genotyping of human platelet antigen-1 to 17w by polymerase chain reaction sequence-based typing. Vox Sang 2009; 97:330-7. [PMID: 19570064 DOI: 10.1111/j.1423-0410.2009.001213.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
112
|
Chen S, Hong X, Luk B, Harris C. Orthogonal-least-squares regression: A unified approach for data modelling. Neurocomputing 2009. [DOI: 10.1016/j.neucom.2008.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
113
|
Hong X, Posadas A, Zou K, Ahn CH, Zhu J. High-mobility few-layer graphene field effect transistors fabricated on epitaxial ferroelectric gate oxides. PHYSICAL REVIEW LETTERS 2009; 102:136808. [PMID: 19392391 DOI: 10.1103/physrevlett.102.136808] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Indexed: 05/27/2023]
Abstract
The carrier mobility mu of few-layer graphene (FLG) field-effect transistors increases tenfold when the SiO2 substrate is replaced by single-crystal epitaxial Pb(Zr0.2Ti0.8)O3 (PZT). In the electron-only regime of the FLG, mu reaches 7x10(4) cm(2)/V s at 300 K for n=2.4x10(12)/cm(2), 70% of the intrinsic limit set by longitudinal acoustic (LA) phonons; it increases to 1.4x10(5) cm(2)/V s at low temperature. The temperature-dependent resistivity rho(T) reveals a clear signature of LA phonon scattering, yielding a deformation potential D=7.8+/-0.5 eV.
Collapse
|
114
|
Liu X, Zhang S, Tsai HJ, Hong X, Wang B, Fang Y, Liu X, Pongracic JA, Wang X. Genetic and environmental contributions to allergen sensitization in a Chinese twin study. Clin Exp Allergy 2009; 39:991-8. [PMID: 19302247 DOI: 10.1111/j.1365-2222.2009.03228.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Allergic disease is on the rise worldwide. Effective prevention of allergic disease requires comprehensive understanding of the factors that contribute to its intermediate phenotypes, such as sensitization to common allergens. OBJECTIVE To estimate the degree of genetic and environmental contributions to sensitization to food and aeroallergens. METHODS Sensitization was defined as a positive skin prick test to an allergen. We calculated the zygosity-specific concordance rates and odds ratios (ORs) for sensitization to food and aeroallergens in 826 Chinese twin pairs [472 monozygotic (MZ) and 354 dizygotic (DZ)] aged 12-28 years. We also applied structural equation modelling procedures to estimate genetic and environmental influences on sensitization. RESULTS The concordance rates and risk of sensitization in one twin given the presence vs. the absence of sensitization in the other twin were higher in MZ twins than those in DZ twins. However, a large number of MZ twins were discordant in sensitization to common allergens. These observations suggest both genetic and environmental factors influence sensitization. Consistently, the estimated heritability and individual environmental components of the liability to sensitization ranged from 0.51 to 0.68 and 0.32 to 0.49, respectively, based on the best-fitted structural equation model. We also observed high phenotypic correlations between sensitization to two aeroallergens (cockroach and dust mite: 0.83) and two food allergens (peanut and shellfish: 0.58), but only moderate correlations for the pairs between sensitization to a food and an aeroallergen (0.31-0.46). The shared genetic and environmental factors between paired sensitizations contribute to the observed correlations. CONCLUSION We demonstrated that sensitization to common food and aeroallergens were influenced by both genetic and environmental factors. Moreover, we found that paired allergen sensitizations might share some common sets of genes and environmental factors. This study underscores the need to further delineate unique and/or pleiotropic genetic and environmental factors for allergen sensitization.
Collapse
|
115
|
Story R, Hong X, Kumar R, Yu Y, Pongracic J, Wang X. Maternal Pre-Pregnancy Obesity is Associated with Recurrent Wheezing in Children. J Allergy Clin Immunol 2009. [DOI: 10.1016/j.jaci.2008.12.996] [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]
|
116
|
Kumar R, Hong X, Story R, Yu Y, Pongracic J, Wang X. Gestational Diabetes is Associated with Food Allergen Sensitization in an Inner-City Population. J Allergy Clin Immunol 2009. [DOI: 10.1016/j.jaci.2008.12.1038] [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]
|
117
|
Pongracic J, Hong X, Story R, Kumar R, Yu Y, Wang X. Low Socioeconomic Status is a Risk Factor for Sensitization to Food Allergens in an Inner City Birth Cohort. J Allergy Clin Immunol 2009. [DOI: 10.1016/j.jaci.2008.12.412] [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]
|
118
|
Nugent C, Mulvenna M, Hong X, Devlin S. Experiences in the development of a Smart Lab. INTERNATIONAL JOURNAL OF BIOMEDICAL ENGINEERING AND TECHNOLOGY 2009. [DOI: 10.1504/ijbet.2009.027796] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
119
|
Chen S, Hong X, Harris C, Hanzo L. Fully complex-valued radial basis function networks: Orthogonal least squares regression and classification. Neurocomputing 2008. [DOI: 10.1016/j.neucom.2007.12.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
120
|
Hong X, Zhou H, Tsai HJ, Wang X, Liu X, Wang B, Xu X, Xu X. Cysteinyl leukotriene receptor 1 gene variation and risk of asthma. Eur Respir J 2008; 33:42-8. [PMID: 18829683 DOI: 10.1183/09031936.00057708] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Although it has been recognised that genetics plays an important role in the development of asthma, important causal loci remain to be identified. The aim of the present study was to examine the association of known and novel candidate genes with asthma. Two independent samples, including 170 asthmatic cases and 347 controls in the initial sample, and 202 asthmatic cases and 332 controls in the confirmation sample, were recruited from the same region of China. Functional single nucleotide polymorphisms (SNPs; n = 129) from 105 genes were genotyped using MassARRAY technology, and 119 SNPs were used for the subsequent analysis. In the initial sample, three SNPs, rs320995 in the cysteinyl leukotriene receptor 1 gene, rs1047266 in the tumour necrosis factor receptor superfamily, member 10b, gene and rs40401 in the interleukin-3 gene, were associated with risk of asthma. Notably, under the recessive genetic model, subjects without the thymidine allele in SNP rs320995 had a 3.1 times higher risk of asthma, which remained significant after accounting for multiple testing. This association was replicated in the confirmation sample and validated by meta-analysis. Further, sex-specific analysis was performed, but no sex difference was found. The present study provided coherent evidence that cysteinyl leukotriene receptor 1 gene variation is associated with risk of asthma.
Collapse
|
121
|
Kwun J, Hazinedaroglu SM, Schadde E, Kayaoglu HA, Fechner J, Hu HZ, Roenneburg D, Torrealba J, Shiao L, Hong X, Peng R, Szewczyk JW, Sullivan KA, DeMartino J, Knechtle SJ. Unaltered graft survival and intragraft lymphocytes infiltration in the cardiac allograft of Cxcr3-/- mouse recipients. Am J Transplant 2008; 8:1593-603. [PMID: 18476975 DOI: 10.1111/j.1600-6143.2008.02250.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Previous studies showed that absence of chemokine receptor Cxcr3 or its blockade prolong mouse cardiac allograft survival. We evaluated the effect of the CXCR3 receptor antagonist MRL-957 on cardiac allograft survival, and also examined the impact of anti-CXCR3 mAb in human CXCR3 knock-in mice. We found only a moderate increase in graft survival (10.5 and 16.6 days, p < 0.05) using either the antagonist or the antibody, respectively, compared to control (8.7 days). We re-evaluated cardiac allograft survival with two different lines of Cxcr3(-/-) mice. Interestingly, in our hands, neither of the independently derived Cxcr3(-/-) lines showed remarkable prolongation, with mean graft survival of 9.5 and 10.8 days, respectively. There was no difference in the number of infiltrating mononuclear cells, expansion of splenic T cells or IFN-gamma production of alloreactive T cells. Mechanistically, an increased other chemokine receptor fraction in the graft infiltrating CD8 T cells in Cxcr3(-/-) recipients compared to wild-type recipients suggested compensatory T-cell trafficking in the absence of Cxcr3. We conclude Cxcr3 may contribute to, but does not govern, leukocyte trafficking in this transplant model.
Collapse
|
122
|
Zhao YL, Cai GM, Hong X, Shan LM, Xiao XH. Anti-hepatitis B virus activities of triterpenoid saponin compound from Potentilla anserine L. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2008; 15:253-8. [PMID: 18337074 DOI: 10.1016/j.phymed.2008.01.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The Tibetan herb Potentilla anserina L. has been widely used in China for many thousands of years to treat hepatitis-B. Bioassay-guided fractionation of the ethanol extract of the rhizomes led to the isolation of a triterpenoid saponin (TS) that was determined to be 2alpha,3beta,19alpha-trihydroxyurs-12-en-28-oic acid beta-D-glucopyranosyl ester. Using models of HBV infection, this compound was evaluated for its effect on HBV antigene expression in the 2.2.15 cell line in vitro and anti-hepatitis B virus (HBV) activities in Peking ducklings in vivo. Results showed that it could decrease the expression levels of HBsAg, HBeAg and HBVDNA in the 2.2.15 cell culture and the inhibitory effect was not due to the cytotoxity of the triterpenoid saponin. The antiviral study in vivo on Peking ducklings also demonstrated that this compound inhibits duck hepatitis B virus (DHBV) DNA replication.
Collapse
|
123
|
Yan L, Zhu F, Liu Y, Xu X, Hong X. Sequences variations in 5'-flanking region of ABO gene and correlation with ABO alleles in the indigenous Chinese. Vox Sang 2008; 94:227-233. [PMID: 18086287 DOI: 10.1111/j.1423-0410.2007.01013.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVES 5'-flanking sequences of the ABO gene play important role in the regulation of gene expression, but polymorphism of 5'-flanking sequence of ABO gene is rarely known. Here, we further characterize the molecular genetic basis and ABO allele-related polymorphism of the 5'-untranslated regions (5'-UTR) of the human ABO gene. MATERIALS AND METHODS Collecting blood samples from 72 blood donors in Hangzhou, China, we analysed sequences of exons 6 and 7 of ABO gene and amplified an enhanced segment of 43 bp repeats in the 5'-UTR. Subsequently, we selected 25 homozygotes [of genotypes A101/A101 (two), A102/A102 (seven), B101/B101 (seven) and O01/O01 (nine)] and five heterozygotes [A102/O01 (two), B101/O01 (two) and O01/O105 (one)] for sequencing 5 -kb amplicons spanning the 5'-UTR and partial exon 1 of the ABO gene. We sequenced the amplicons bidirectionally and, when pertinent, analysed selected haplotypes by cloning. RESULTS As a result, we identified 11 new polymorphic sites (10 point mutations, one 8-bp deletion) in the 5'-UTR of the A102, B101 and O01 alleles of common ABO phenotypes. Five A102 alleles carry four tandem repeats of a 43-bp minisatellite unit that deviated from previous reports. CONCLUSION The results revealed the DNA polymorphisms in the 5'-UTRs correlated with the common ABO alleles. Elucidation of the diversity of the 5'-UTRs is an important supplement to existing methods for increasing our understanding of the molecular basis of the ABO blood group system.
Collapse
|
124
|
Liu H, Zhang S, Jiang S, Mao G, Hong X, Yu Y, Zhang Y, Tang G, Xing H, Xu X. Renin-Angiotensin-Aldosterone System (RAAS) gene polymorphisms and antihypertensive response to irbesartan in Chinese hypertensives. ACTA ACUST UNITED AC 2008; 30:307-12. [DOI: 10.1358/mf.2008.30.4.1186077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
125
|
Chen S, Hong X, Harris C. An orthogonal forward regression technique for sparse kernel density estimation. Neurocomputing 2008. [DOI: 10.1016/j.neucom.2007.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|