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Guang Zheng, Wang B, Fang T, Cheng H, Qi Y, Wang Y, Yan B, Bi Y, Wang Y, Chu S, Wu T, Xu J, Min H, Yan S, Ye C, Jia Z. Laser Digital Cinema Projector. ACTA ACUST UNITED AC 2008. [DOI: 10.1109/jdt.2008.924163] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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202
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Qi Y, Liu LC, Zhang BQ, Shen Z, Wang J, Chen YH. Characterization of antibody responses against a neutralizing epitope on the glycoprotein E2 of classical swine fever virus. Arch Virol 2008; 153:1593-8. [PMID: 18607674 DOI: 10.1007/s00705-008-0147-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Accepted: 05/27/2008] [Indexed: 11/27/2022]
Abstract
The sequence TAVSPTTLR is a conserved and linear neutralizing epitope on the glycoprotein E2 of classical swine fever virus. In this study, TAVSPTTLR-directed antibodies, induced either by virions or by an epitope-focused immunogen, were characterized. The results revealed that despite the same epitope specificity, the antibodies induced by different immunogens varied significantly both in the neutralizing test and in binding inhibition assays. This suggests that the protective immunity induced by this epitope is due to more than simply the epitope specificity and that this epitope might need essential contributions from its flanking context to induce functional epitope-specific antibodies.
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203
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Huang TH, He L, Qin Q, Yang Q, Peng G, Harada M, Qi Y, Yamahara J, Roufogalis BD, Li Y. Salacia oblonga root decreases cardiac hypertrophy in Zucker diabetic fatty rats: inhibition of cardiac expression of angiotensin II type 1 receptor. Diabetes Obes Metab 2008; 10:574-85. [PMID: 17645561 DOI: 10.1111/j.1463-1326.2007.00750.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS We investigated the effect of the water extract of Salacia oblonga (SOE), an ayurvedic antidiabetic and antiobesity medicine, on obesity and diabetes-associated cardiac hypertrophy and discuss the role of modulation of cardiac angiotensin II type 1 receptor (AT(1)) expression in the effect. METHODS SOE (100 mg/kg) was given orally to male Zucker diabetic fatty (ZDF) rats for 7 weeks. At the end-point of the treatment, the hearts and left ventricles were weighed, cardiomyocyte cross-sectional areas were measured, and cardiac gene profiles were analysed. On the other hand, angiotensin II-stimulated embryonic rat heart-derived H9c2 cells and neonatal rat cardiac fibroblasts were pretreated with SOE and one of its prominent components mangiferin (MA), respectively. Atrial natriuretic peptide (ANP) mRNA expression and protein synthesis and [(3)H]thymidine incorporation were determined. RESULTS SOE-treated ZDF rats showed less cardiac hypertrophy (decrease in weights of the hearts and left ventricles and reduced cardiomyocyte cross-sectional areas). SOE treatment suppressed cardiac overexpression of ANP, brain natriuretic peptide (BNP) and AT(1) mRNAs and AT(1) protein in ZDF rats. SOE (50-100 microg/ml) and MA (25 micromol) suppressed angiotensin II-induced ANP mRNA overexpression and protein synthesis in H9c2 cells. They also inhibited angiotensin II-stimulated [(3)H]thymidine incorporation by cardiac fibroblasts. CONCLUSIONS Our findings demonstrate that SOE decreases cardiac hypertrophy in ZDF rats, at least in part by inhibiting cardiac AT(1) overexpression. These studies provide insights into a potential cardioprotective role of a traditional herb, which supports further clinical evaluation in obesity and diabetes-associated cardiac hypertrophy.
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Schild SE, Qi Y, Tan AD, Mandrekar SJ, Adjei AA, Krook JE, Rowland KM, Garces YI, Soori GS, Sloan JA. Baseline quality of life (QOL) as a prognostic factor for overall survival (OS) in patients (Pts) with advanced stage non-small cell lung cancer (A-NSCLC): An analysis of NCCTG studies. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.8076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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205
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Dy GK, Croghan GA, Qi Y, Glockner J, Hanson L, Roos M, Tan AD, Molina JR, Adjei AA. Phase I trial of the mTOR inhibitor RAD001 (R) in combination with two schedules of the vascular endothelial growth factor (VEGF) receptor tyrosine kinase inhibitor PTK787/ZK 222584 (P) in patients (pts) with advanced solid tumors. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.2529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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206
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Qi Y, Iqbal J, Oldfield BJ, Clarke IJ. Neural connectivity in the mediobasal hypothalamus of the sheep brain. Neuroendocrinology 2008; 87:91-112. [PMID: 17938564 DOI: 10.1159/000109944] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Accepted: 08/21/2007] [Indexed: 11/19/2022]
Abstract
The ventromedial nucleus of the hypothalamus (VMN) and the arcuate nucleus (ARC) are two centres regulating energy balance and food intake, but inter-connectivity of these nuclei is not well defined in non-rodent species. In this study, we performed retrograde tracing and immunohistochemistry in the ovine brain with ewes receiving FluoroGold (FG) injections into either ARC or VMN for the mapping of retrogradely labelled cells. Strong reciprocal connections were found between the two regions. The distribution of the FG labelled neurons in other regions of the hypothalamus and brain stem was also mapped. Some of the cells projecting from ARC to VMN were immunopositive for neuropeptide Y, galanin, adrenocorticotropin (marker of pro-opiomelanocortin cells) or tyrosine hydroxylase (marker of dopaminergic cells). Melanin-concentrating hormone and orexin neurons in the lateral hypothalamic area were also found to provide input to the VMN and ARC. This observed interconnectivity between regions important for metabolic regulation and other neuroendocrine functions presumably allows coordinated functions. Input to both the ARC and VMN from other brain regions, such as brain stem cell groups, provides a further level of regulation. These data provide a substrate upon which further understanding of appetite regulation and neuroendocrine function can be derived in this species.
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Dentel SK, Qi Y, Herson DS. Improving the assessment of risk from pathogens in biosolids: fecal coliform regrowth, survival, enumeration, and assessment. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2008; 57:189-193. [PMID: 18235170 DOI: 10.2166/wst.2008.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Reactivation or regrowth of fecal coliform bacteria in biosolids has recently become a concern due to knowledge that Class B materials may fail to meet this criterion after storage or even after land application. In this paper, data show the two types of fecal coliform increases that have been characterized: immediate reappearance of large concentrations directly after dewatering; and the rapid, but less immediate, increases that follow dewatering with some biosolids after dewatering. The latter phenomenon is shown to extend over a time period of days prior to gradual decrease in fecal coliform numbers. Modeling shows that anaerobic or fermentative growth cannot simulate the observed growth, but that a straightforward biokinetic model can duplicate the observed conditions if a doubling time of one hour is assumed, which is supported by literature. Thus regrowth cannot be ruled out as the underlying phenomenon.
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208
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Qi Y, Niu W, Zhou W, Hou S, Qiu C. Correlation between angiotensinogen gene polymorphisms and essential hypertension in Chinese population. J Hum Hypertens 2007; 22:147-50. [PMID: 17823594 DOI: 10.1038/sj.jhh.1002282] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Essential hypertension (EHT) has a genetic basis. Considering the pathological, physiological and biological mechanisms implicated in blood pressure regulation, many candidates have been listed as hypertension genes, of which the angiotensinogen gene (AGT) is weighed as the most promising one.
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209
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Xu H, Yao L, Lu S, Qi Y. Host filamentous actin is associated with Heliothis armigera single nucleopolyhedrosis virus (HaSNPV) nucleocapsid transport to the host nucleus. Curr Microbiol 2007; 54:199-206. [PMID: 17294324 DOI: 10.1007/s00284-006-8261-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2006] [Accepted: 08/28/2006] [Indexed: 01/16/2023]
Abstract
VP39 is the major capsid protein of Heliothis armigera nucleopolyhedrovirus (HaSNPV), and it might have induced the aggregation of host cellular actin in vitro in our previous study. We demonstrated here that VP39 could interact with host actin in vivo in Helicoverpazea (Hz-AM1 cells) through coimmunoprecipitation assay. With confocal immunofluorescence microscopy, it was confirmed further that the released HaSNPV nucleocapsids/VP39s in the host cytoplasm (0.5 hours after infection) colocalized where the actin aggregated and that the nucleocapsids/VP39s were transported from the host cytoplasm to the nucleus (2 hours after infection). Because cytochalasin D (CD) was used to prevent host global actin from forming filamentous structures, the infection efficiency of the recombinant virus HaSNPV/gfpdeltap74, with the gfp gene inserted into HaSNPV p74 gene loci, was decreased to 7.34%, whereas it was 34.7% in normal host cells and 55.7% in the cells whose microtubules had been destroyed by colchicin. Ultramicroscopy assay revealed that HaSNPV nucleocapsids could enter the cytoplasm of CD-treated cells but could not be transported to the nucleus, which resulted in the lower infection efficiency of HaSNPV/gfpdeltap74 in CD-treated cells. However, transportation of the nucleocapsids was not inhibited in colchicin-treated cells, demonstrating that the transportation of HaSNPV nucleocapsid from the cytoplasm to the nucleus was associated with actin filaments but not with microtubules, a conclusion that is also strongly supported by evidence from the RNAi interference of host actin during HaSNPV infection.
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Moore LE, Bergen AW, Haque KA, Qi Y, Castle P, Chanock SJ, Egan K, Newcomb P, Titus-Ernstoff L, Alguacil J, Rothman N, Garcia-Closas M. Whole genome amplification of buccal cytobrush DNA collected for molecular epidemiology studies. Biomarkers 2007; 12:303-12. [PMID: 17453743 DOI: 10.1080/13547500601162011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
When cytobrush buccal cell samples have been collected as a genomic DNA (gDNA) source for an epidemiological study, whole genome amplification (WGA) can be critical to maintain sufficient DNA for genotyping. We evaluated REPLI-g WGA using gDNA from two paired cytobrushes (cytobush 'A' kept in a cell lysis buffer, and 'B' dried and kept at room temperature for 3 days, and frozen until DNA extraction) in a pilot study (n=21), and from 144 samples collected by mail in a breast cancer study. WGA success was assessed as the per cent completion/concordance of STR/SNP genotypes. Locus amplification bias was assessed using quantitative PCR of 23 human loci. The pilot study showed > 98% completion but low genotype concordance between cytobrush wgaDNA and paired blood gDNA (82% and 84% for cytobrushes A and B, respectively). Substantial amplification bias was observed with significantly lower human gDNA amplification from cytobrush B than A. Using cytobrush gDNA samples from the breast cancer study (n =20), an independent laboratory demonstrated that increasing template gDNA to the REPLI-g reaction improved genotype performance for 49 SNPs; however, average completion and concordance remained below 90%. To reduce genotype misclassification when cytobrush wgaDNA is used, inclusion of paired gDNA/wgaDNA and/or duplicate wgaDNA samples is critical to monitor data quality.
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211
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Wang Z, Hou J, Zeng G, Wen S, Tanaka Y, Cheng J, Kurbanov F, Wang L, Jiang J, Naoumov NV, Mizokami M, Qi Y. Distribution and characteristics of hepatitis B virus genotype C subgenotypes in China. J Viral Hepat 2007; 14:426-34. [PMID: 17501764 DOI: 10.1111/j.1365-2893.2006.00813.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Genetic diversity within the same hepatitis B virus (HBV) genotype indicates the presence of several subgenotypes. We have found that genotype C is the most common in China, and this study aimed to determine the geographical distribution and characteristics of HBV-C subgenotypes in the country. A cohort of 534 patients with chronic HBV genotype C infection, collected across China, was analysed by nucleotide sequencing or polymerase chain reaction-restriction fragment length polymorphism. HBV-C1/Cs (n = 112, 21%) and HBV-C2/Ce (n = 397, 74%) were the most common HBV-C subgenotypes and showed different geographical distribution in China. No significant differences were found between patients infected with HBV-C1 and HBV-C2 when comparing liver function tests, hepatitis B e antigen positive rate and clinical manifestations. We identified two other types of HBV-C provisionally designated as HBV-CD1 and HBV-CD2, which have particular virological features and clustered in one geographic area. These two types of C/D hybrids have emerged through recombination with genotype D and encode serotype ayw2 hepatitis B surface antigen. In conclusion, there are at least four subtypes of HBV genotype C: subgenotypes C1, C2 and two types of C/D recombinants CD1 and CD2 in China, which have a distinct geographic distribution. Whether HBV-C subgenotypes differ in their impact on liver disease progression requires prospective studies.
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Qi Y, Niu W, Cen W, Cui C, Zhuoma C, Zhuang L, Cai D, Li G, Zhou W, Hou S, Qiu C. Strong association of the renin TaqI polymorphism with essential hypertension in Chinese Han and Tibetan populations. J Hum Hypertens 2007; 21:907-10. [PMID: 17476284 DOI: 10.1038/sj.jhh.1002230] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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213
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Zhang Y, Yang YL, Sun F, Cai X, Qian N, Yuan Y, Wang ZX, Qi Y, Xiao JX, Wang XY, Zhang YH, Jiang YW, Qin J, Wu XR. Clinical and molecular survey in 124 Chinese patients with Leigh or Leigh-like syndrome. J Inherit Metab Dis 2007; 30:265. [PMID: 17323145 DOI: 10.1007/s10545-006-0481-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2006] [Revised: 12/06/2006] [Accepted: 12/11/2006] [Indexed: 10/23/2022]
Abstract
Leigh syndrome is the most common mitochondrial disorder in children characterized by necrotic lesions in the central nervous system. Both mitochondrial DNA (mtDNA) and nuclear DNA defects in the mitochondrial respiratory chain can lead to this disease. To characterize the clinical and genetic traits of Leigh or Leigh-like syndrome patients in China, 124 unrelated cases were collected between 1992 and 2005. Seventy-seven cases (62.1%) met the typical criteria of Leigh syndrome, including symmetrical bilateral abnormal signals in the basal ganglia, thalamus and brain stem, etc. Other cases (37.9%) belonged to Leigh-like syndrome with atypical clinical or radiological manifestations. Late-onset patients accounted for 20.2%, which is more than previously reported. Movement disorder was the most common symptoms in our patients. Thirty-two patients (25.8%) were confirmed to carry mutant genes. Among them, six cases (4.8%) have been demonstrated to have point mutations in mitochondrial DNA. Two separate patients were detected to have mutations on A8344G and A3243G. The T8993G point mutation was identified in one patient and T8993C in one other patient. SURF1 mutations associated with cytochrome-c oxidase deficiency were identified in 25 patients (20.2%). Four unreported variations have been identified in SURF1 gene from three patients. G604C was found in 22 patients. Only one patient had C214T mutation in the pyruvate dehydrogenase E1alpha subunit gene. In the remaining 92 patients (74.2%), a specific molecular dysfunction or underlying metabolic abnormality could not be identified.
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Dubey JP, Sundar N, Pineda N, Kyvsgaard NC, Luna LA, Rimbaud E, Oliveira JB, Kwok OCH, Qi Y, Su C. Biologic and genetic characteristics of Toxoplasma gondii isolates in free-range chickens from Nicaragua, Central America. Vet Parasitol 2006; 142:47-53. [PMID: 16876324 DOI: 10.1016/j.vetpar.2006.06.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2006] [Revised: 06/15/2006] [Accepted: 06/18/2006] [Indexed: 11/20/2022]
Abstract
The prevalence of Toxoplasma gondii in free-ranging chickens is a good indicator of the prevalence of T. gondii oocysts in the soil because chickens feed from the ground. The prevalence of T. gondii in 98 free-range chickens (Gallus domesticus) from Nicragua was determined. Antibodies to T. gondii were assayed by the modified agglutination test (MAT), and found in 84 (85.7%) of 98 chickens with titers of 1:5 in 10, 1:10 in eight, 1:20 in seven, 1:40 in nine, 1:80 in 11, 1:160 in one, 1:200 in 27, 1:400 in six, 1:800 four, and 1:3200 in one bird. Hearts and brains of 32 chickens with titers of 1:10 or less were pooled and fed to three T. gondii-free cats. Hearts and brains of 66 chickens with titers of 1:20 or higher were bioassayed in mice. Feces of cats were examined for oocysts. The cat fed tissues from eight chickens with titers of 1:10 shed T. gondii oocysts. The two cats fed tissues of 24 chickens with titers of 1:5 or less did not shed oocysts. T. gondii was isolated by bioassay in mice from 47 chickens with MAT titers of 1:20 or higher. All infected mice from six isolates died of toxoplasmosis. Overall, 41 of 170 (24.1%) mice that became infected after inoculation with chicken tissues died of toxoplasmosis. Genotyping of these 48 isolates (47 from mice and 1 from pooled tissues) using polymorphisms at the loci SAG1, SAG2, SAG3, BTUB and GRA6 revealed eight genotypes. Six isolates had Type I alleles, three isolate had Type II alleles and six isolates had Type III alleles at all loci. Four isolates had mixed infections. Two isolates have a unique allele at SAG1 locus and combination of I and III alleles at other loci. The rest 27 isolates contained the combination of Type I and III alleles and were divided into four genotypes. More than one genotypes were often isolated in chickens from the same household, indicating multiple genotypes were circulating in the same environment. This may explain the high frequency of mixed infections observed. High rate of mixed infection in intermediate hosts such as chickens may facilitate genetic exchange between different parasite lineages in definitive feline hosts. This is the first report of genetic characterization of T. gondii isolates from Nicragua, Central America.
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Mao ZQ, He R, Sun M, Qi Y, Huang YJ, Ruan Q. The relationship between polymorphisms of HCMV UL144 ORF and clinical manifestations in 73 strains with congenital and/or perinatal HCMV infection. Arch Virol 2006; 152:115-24. [PMID: 16896551 DOI: 10.1007/s00705-006-0826-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2006] [Accepted: 06/22/2006] [Indexed: 10/24/2022]
Abstract
Human cytomegalovirus (HCMV) displays genetic variability and can cause a wide range of diseases in neonates. To explore the relationship between polymorphisms and clinical manifestations, the UL144 genes from 73 clinical strains were sequenced. All of the strains, which came from 70 infants with suspected congenital and/or perinatal HCMV infection, were non-passage strains. Among them, 23 strains were from surgery specimens, and the others were from urine samples. Clinically, 12 infants displayed asymptomatic infection and 58 patients displayed symptomatic infection. The results showed that 36 patients (49.3%) were infected with strains belonging to UL144 group G1 (G1a 33/36, G1b 3/36), 19 patients (28.8%) were infected with strains belonging to group G2, and 15 patients (21.9%) were infected with strains belonging to group G3. This result indicated that UL144 group G1 was the predominant genotype in congenital and/or perinatal HCMV infection in northern China. Compared with the distribution pattern of strains in UL144 genotypes of data from Chicago, Iowa and Texas, and Japan by chi-square test, the difference was statistically significant. This suggested that the distribution pattern of strains in UL144 genotype was related to geographic location. However, no linkage was observed between the UL144 genotypes and the severity and/or outcome of HCMV disease.
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216
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Chengyu L, Xiaoxin J, Jian Z, Chen G, Qi Y. The anatomical significance and techniques of laparoscopic rectal surgery. Surg Endosc 2006; 20:734-8. [PMID: 16544082 DOI: 10.1007/s00464-004-2247-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2004] [Accepted: 06/10/2005] [Indexed: 10/24/2022]
Abstract
BACKGROUND Because there are difficulties associated with the technique of laparoscopic colorectal surgery, thorough knowledge of the anatomy is particularly important. We pay close attention to anatomical features during laparoscopic rectal surgery. In this study, we analyze the association of the anatomy with the operative procedure. METHODS Laparoscopic rectal surgery was performed on 117 patients (66 men) with benign and malignant diseases in the rectum by the complete laparoscopy or hand-assisted technique. All operations were mainly performed by the first author. The association between anatomy and the operation was analyzed. RESULTS The mean operative time was 144 min (range, 87-235). The hand-assisted technique was performed in two patients. Four patients required conversion to laparotomy due to the amount of fat in three patients and disruption of the Endo-stapler in one patient, for a conversion rate of 1.7%. Operative blood loss was small, averaging 126 ml (range, 50-350). No injury of the ureters, major bleeding in front of the sacrum, or other operation-related severe complications occurred during or after operation. In one case, dissecting disrupted the anterior left wall of the rectum. CONCLUSION By mastering the anatomical features of laparoscopic rectum surgery, operative mistakes and complications can be reduced. Particular attention must be paid to the anatomy of the obese patient undergoing laparoscopy. It is very convenient that the corresponding skills can be applied in the course of dissection and exposure.
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Song G, Hennessy M, Zhao YL, Li Q, Han WD, Qi Y, Zhao WN, Silke B, Barry M, Doyle R, Spiers JP. Adrenoceptor blockade alters plasma gelatinase activity in patients with heart failure and MMP-9 promoter activity in a human cell line (ECV304). Pharmacol Res 2006; 54:57-64. [PMID: 16574429 DOI: 10.1016/j.phrs.2006.02.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2006] [Revised: 02/17/2006] [Accepted: 02/17/2006] [Indexed: 10/25/2022]
Abstract
This study assessed the effects of short-term adrenoceptor blockade on plasma matrix metalloproteinase (MMP) activity in patients with heart failure, and the ability of adrenoceptor stimulation to modulate matrix metalloproteinase-9 (MMP-9) promoter activity in vitro. Patients with heart failure received standard therapy or standard therapy plus carvedilol. Plasma MMP activity was determined by zymography and tissue inhibitor (TIMP-1) expression was measured by immunoblotting. MMP-9 promoter activity was assessed in transfected ECV304 cells following exposure to isoprenaline or phenylephrine in the absence or presence of either propranolol or prazosin. In patients with heart failure, carvedilol attenuated the increase in proMMP-9 activity observed at 4 and 12 weeks in non-beta-blocker-treated patients (44.0 +/- 4.9 AU versus 60.8 +/- 6.7 AU; P < 0.05). Although TIMP-1 expression was unaltered, the MMP-9:TIMP-1 ratio was lower in those receiving carvedilol at 4 and 12 weeks (0.54 +/- 0.07 versus 1.04 +/- 0.17; P < 0.05). Isoprenaline transiently increased MMP-9 promoter activity after 4 h exposure (80.6 +/- 14.8-fold; P < 0.001) before returning to baseline. The response to isoprenaline was prevented by propranolol (P < 0.01). Phenylephrine caused a biphasic increase in MMP-9 promoter activity, with the greatest increase occurring at 24 h (23 +/- 3.7-fold) compared to baseline. This response was unaffected by co-incubation with prazosin. In conclusion, treatment with a mixed alpha1/beta-adrenoceptor antagonist attenuates MMP activity and tips the degradative balance to a less degradative phenotype in heart failure patients. Furthermore, adrenoceptor stimulation increases MMP-9 promoter activity, which is inhibited by beta- but not alpha-adrenoceptor blockade. Therefore, mixed adrenoceptor blockade may reduce remodeling in heart failure as a direct consequence of a beta-adrenoceptor-mediated reduction in MMP-9 transcription.
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Sicklick J, Li Y, Jayaraman A, Kannangai R, Chen W, Qi Y, Vivekanandan P, Ludlow J, Owzar K, Torbenson M, Diehl A. Smoothened overexpression activates hedgehog signaling in human hepatocarcinogenesis. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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219
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Bressler E, Qi Y, Roztocil E, Nicholl S, Davies M. Urokinase-induced smooth muscle cell migration requires PKC-alpha and PKC-delta isoforms. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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220
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Xu H, Xu Q, Zhang P, Yan F, Qi Y. SLAM expression is not downregulated by measles virus infection. Acta Virol 2006; 50:235-41. [PMID: 17177608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
It has been reported that the signaling lymphocyte-activation molecule (SLAM), the second receptor of Measles virus (MV) on the cell surface appears to be downregulated by MV infection or by expression of MV hemagglutinin (H) (Tanaka et al., 2002; Welsteadt et al., 2004). The aim of this study was to analyze this phenomenon in more detail using a Chinese vaccine strain (S191) of MV. Flow cytometry confirmed apparent downregulation of SLAM in the virus-infected cells and in the cells transfected with a plasmid expressing viral H. Moreover, a similar effect was obtained by incubation of the cells with UV-inactivated virus or soluble viral H. Real-time quantitative PCR showed that the SLAM mRNA level remained stable during the virus infection, and Western blot analysis demonstrated that the SLAM content of total membrane proteins did not change change after the virus infection. Thus we conclude that SLAM expression is stable during the MV infection and that its apparent downregulation reported earlier and confirmed also in this study was just the result of masking of the antibody recognition sites on SLAM with MV H during the flow cytometry assay.
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Zhang X, Walling DE, Yang Q, He X, Wen Z, Qi Y, Feng M. 137Cs budget during the period of 1960s in a small drainage basin on the Loess Plateau of China. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2006; 86:78-91. [PMID: 16144731 DOI: 10.1016/j.jenvrad.2005.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Revised: 07/12/2005] [Accepted: 07/12/2005] [Indexed: 05/04/2023]
Abstract
A sediment profile with a thickness of 28.12 m in a failed reservoir in a small catchment of the Yuntaishan Gully in the Loess Plateau of China consisted of 44 flood couplets deposited during the period from 1960 to 1970 with total volume of 2.36 x 10(6)m(3). Specific sediment yields for a flood event varied from 300 t km(-2) to 14,400 t km(-2) and annual sediment yields varied from 2500 t km(-2) in 1966 to 40,000 t km(-2) in 1964 with a mean value of 12,700 t km(-2)a(-1) for the period. Average annual (137)Cs concentrations of the sediments increased from 0.92 Bq kg(-1) in 1960 to 4.82 Bq kg(-1) in 1963, then decreased to 1.53 Bq kg(-1) in 1970. The total (137)Cs activity in the reservoir sediments was 9.22 x 10(9) Bq, which accounted for 31.9% of the total (137)Cs fallout precipitation of 2.89 x 10(10) Bq within the catchment during the period. The proportion of the (137)Cs loss from the catchment to the (137)Cs fallout precipitation within the catchment in a year varied between 8.01% and 66.8%, and it was 20.9% for the peak (137)Cs deposition year of 1963 and 52.0% in 1964. By analysis of the (137)Cs budget in the catchment for the (137)Cs peak precipitation period from 1962 to 1964, the (137)Cs surface enrichment coefficient Gamma should be much less than 0.23. And for calculation of soil losses on the cultivated land in the inter-gully area by using the Mass Balance Model II, the value of Gamma should be 0.05-0.1.
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Ma YP, Ruan Q, He R, Qi Y, Sun ZR, Ji YH, Huang YJ, Liu Q, Chen SR, Wang JD. Sequence variability of the human cytomegalovirus UL141 Open Reading Frame in clinical strains. Arch Virol 2005; 151:827-35. [PMID: 16195788 DOI: 10.1007/s00705-005-0638-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2005] [Accepted: 08/15/2005] [Indexed: 01/14/2023]
Abstract
Human cytomegalovirus (HCMV) displays genetic polymorphisms. HCMV disease and tissue tropism may be related to specific genomic variability among strains. This work analyzed the genetic polymorphism of UL141 open reading frame (ORF), one of the genes in HCMV UL/b' region, from 21 clinical strains. 8 previously published UL141 sequences in the GenBank were used for sequence comparison. Detailed sequence analysis showed that the UL141 gene was highly conserved at both the nucleotide and amino acid level. The coding regions were identical in size. The nucleotide and amino acid sequence identities among all strains were 96.9-100% and 97.6-100%, respectively.
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Liu Q, Qi Y, Chejanovsky N. Spodoptera littoralis caspase-1, a Lepidopteran effector caspase inducible by apoptotic signaling. Apoptosis 2005; 10:787-95. [PMID: 16133869 DOI: 10.1007/s10495-005-0365-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The baculovirus Autographa californica multiple nucleopolyhedrovirus (AcMNPV) can successfully infect Spodoptera frugiperda SF9 cells, but in contrast, in Spodoptera littoralis SL2 cells it induces apoptosis aborting the infection. To understand better the mechanism of induction and execution of apoptosis in SL2 cells, we identified and characterized the first Spodoptera littoralis caspase, Sl-caspase-1. Sl-caspase-1 is an effector caspase that cleaves DEVD but not IETD and LEHD substrates, and the caspase-3 inhibitor DQMD-CHO inhibited this activity. It was involved in two apoptotic pathways induced by UV irradiation and virus infection. Moreover processing of Sl-caspase-1 was a determinant factor for baculovirus induction of apoptosis in SL2 cells. Since very little is known on the regulation of expression of Lepidopteran caspases, we studied Sl-caspase-1 expression after exposure to apoptosis stimuli. We found that triggering apoptosis in SL2 cells increased the steady-state level of Sl-caspase-1 without changing the level of sl-caspase-1 mRNA, suggesting that Sl-caspase-1 was post-transcriptionally up regulated. This regulation might occur as an early event in transduction of the apoptotic signal.
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Hu L, Wang Z, Hu C, Liu X, Yao L, Li W, Qi Y. Inhibition of Measles virus multiplication in cell culture by RNA interference. Acta Virol 2005; 49:227-34. [PMID: 16402679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Measles takes a toll of one million people a year worldwide, especially in developing countries. As the so far applied vaccines were not able to control this disease, novel approaches to this problem are needed. In this study, we investigated the possibility of inhibition of Measles virus (MV) infection through RNA interference (RNAi), namely the interference with the second but main receptor of MV, signaling lymphocyte activation molecule (SLAM), in an Epstein-Barr virus (EBV)-transformed marmoset B cell line B95-8. Three potential target sequences in the SLAM gene were chosen and cloned into the pSilencer 3.0-H1 vector. The vector constructs were used for transfection of B95-8 cells in which SLAM was then detected by flow cytometry, Western blot analysis and RT-PCR both at transcription and expression levels. One of the vector constructs was found to block effectively the SLAM expression as well as MV infection. These results suggest that RNAi could silence SLAM expression and inhibit the MV infection of host cells.
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