排序方式: 共有79条查询结果,搜索用时 15 毫秒
41.
Brian E. Ford Bruce Sun James Carpino Elizabeth S. Chapler Jane Ching Yoon Choi Kevin Jhun Jung D. Kim Gregory G. Lallos Rachelle Morgenstern Shalini Singh Sai Theja John J. Dennehy 《PloS one》2014,9(11)
Viruses readily mutate and gain the ability to infect novel hosts, but few data are available regarding the number of possible host range-expanding mutations allowing infection of any given novel host, and the fitness consequences of these mutations on original and novel hosts. To gain insight into the process of host range expansion, we isolated and sequenced 69 independent mutants of the dsRNA bacteriophage Φ6 able to infect the novel host, Pseudomonas pseudoalcaligenes. In total, we found at least 17 unique suites of mutations among these 69 mutants. We assayed fitness for 13 of 17 mutant genotypes on P. pseudoalcaligenes and the standard laboratory host, P. phaseolicola. Mutants exhibited significantly lower fitnesses on P. pseudoalcaligenes compared to P. phaseolicola. Furthermore, 12 of the 13 assayed mutants showed reduced fitness on P. phaseolicola compared to wildtype Φ6, confirming the prevalence of antagonistic pleiotropy during host range expansion. Further experiments revealed that the mechanistic basis of these fitness differences was likely variation in host attachment ability. In addition, using computational protein modeling, we show that host-range expanding mutations occurred in hotspots on the surface of the phage''s host attachment protein opposite a putative hydrophobic anchoring domain. 相似文献
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Lewis Landsberg MD Louis J. Aronne MD Lawrence J. Beilin MB BS MD MA Valerie Burke MD Leon I. Igel MD Donald Lloyd‐Jones MD ScM James Sowers MD 《Obesity (Silver Spring, Md.)》2013,21(1):8-24
In light of the worldwide epidemic of obesity, and in recognition of hypertension as a major factor in the cardiovascular morbidity and mortality associated with obesity, The Obesity Society and The American Society of Hypertension agreed to jointly sponsor a position paper on obesity‐related hypertension to be published jointly in the journals of each society. The purpose is to inform the members of both societies, as well as practicing clinicians, with a timely review of the association between obesity and high blood pressure, the risk that this association entails, and the options for rational, evidenced‐based treatment. The position paper is divided into six sections plus a summary as follows: pathophysiology, epidemiology and cardiovascular risk, the metabolic syndrome, lifestyle management in prevention and treatment, pharmacologic treatment of hypertension in the obese, and the medical and surgical treatment of obesity in obese hypertensive patients. Obesity (2012) 相似文献
43.
Jennifer Lee Yeon Sik Hong Jeong Hee Jeong Eun Ji Yang Joo Yeon Jhun Mi Kyoung Park Young Ok Jung Jun Ki Min Ho Youn Kim Sung Hwan Park Mi-La Cho 《PloS one》2013,8(7)
Objective
To investigate the effect of CoenzymeQ10 (CoQ10) on pain severity and cartilage degeneration in an experimental model of rat osteoarthritis (OA).Materials and Methods
OA was induced in rats by intra-articular injection of monosodium iodoacetate (MIA) to the knee. Oral administration of CoQ10 was initiated on day 4 after MIA injection. Pain severity was assessed by measuring secondary tactile allodynia using the von Frey assessment test. The degree of cartilage degradation was determined by measuring cartilage thickness and the amount of proteoglycan. The mankin scoring system was also used. Expressions of matrix metalloproteinase-13 (MMP-13), interleukin-1β (IL-1β), IL-6, IL-15, inducible nitric oxide synthase (iNOS), nitrotyrosine and receptor for advanced glycation end products (RAGE) were analyzed using immunohistochemistry.Results
Treatment with CoQ10 demonstrated an antinociceptive effect in the OA animal model. The reduction in secondary tactile allodynia was shown by an increased pain withdrawal latency and pain withdrawal threshold. CoQ10 also attenuated cartilage degeneration in the osteoarthritic joints. MMP-13, IL-1β, IL-6, IL-15, iNOS, nitrotyrosine and RAGE expressions were upregulated in OA joints and significantly reduced with CoQ10 treatment.Conclusion
CoQ10 exerts a therapeutic effect on OA via pain suppression and cartilage degeneration by inhibiting inflammatory mediators, which play a vital role in OA pathogenesis. 相似文献44.
Lee Nam Kwon Ki Seok Choi Jae Soo Kim Sung Jin Jhun Young-Kuk Kim 《Cluster computing》2014,17(3):791-804
The analysis of global R&D information has become an important factor in making R&D investment strategies and global cooperation with the increased competition in the global market. The R&D analysis in Korea is based on the National Science and Technology Information Service (NTIS). However, it is limited to domestic information and the need to widen the analysis to the global market has risen recently. LOD (Linked Open Data) Cloud service, which is based on the openness and the connection of data, is being expanded recently as is the use of Mashup services through the connection with data from other institutes. In this paper, we will analyze the Linked data structure of CORDIS (Community Research and Development Information Service), which is the R&D information service adopted by the EU, and then suggest a case for utilizing the linked data format and design model for implementing the semantic web to effectively analyze the global national R&D trends by using a case where the RDF Triple data has been semantically mashed up from NTIS and NDSL (National Discovery for Science Leaders). 相似文献
45.
Yang‐J. Kim HyungJun Cho Jinheum Kim Myoungshic Jhun 《Biometrical journal. Biometrische Zeitschrift》2010,52(2):201-208
Quantile regression methods have been used to estimate upper and lower quantile reference curves as the function of several covariates. Especially, in survival analysis, median regression models to the right‐censored data are suggested with several assumptions. In this article, we consider a median regression model for interval‐censored data and construct an estimating equation based on weights derived from interval‐censored data. In a simulation study, the performances of the proposed method are evaluated for both symmetric and right‐skewed distributed failure times. A well‐known breast cancer data are analyzed to illustrate the proposed method. 相似文献
46.
Lam Weng Ngai Chan Pin Jia Ting Ying Ying Sim Hong Jhun Lian Jun Jie Chong Rie Rahman Nur Estya Tan Lorraine Wen Ai Ho Qian Yi Chiam Zhongyu Arora Srishti Lai Hao Ran Ramchunder Sorain J. Peh Kelvin S.-H. Cai Yixiong Chong Kwek Yan 《Ecosystems》2022,25(5):1006-1019
Ecosystems - Functional traits offer generalizability to the prediction of ecosystem processes such as production, and community-weighted mean trait values are increasingly used for such... 相似文献
47.
Kang KY Kim HO Kwok SK Ju JH Park KS Sun DI Jhun JY Oh HJ Park SH Kim HY 《Arthritis research & therapy》2011,13(5):R179
Introduction
Interleukin (IL)-21 is a cytokine that controls the functional activity of effector T helper cells and the differentiation of Th17 cells, and promotes B-cell differentiation. To test whether IL-21 participates in the pathogenesis of primary Sjögren''s syndrome (SS), serum IL-21 level was measured and IL-21 expression in the labial salivary glands (LSG) was examined.Methods
Serum IL-21 levels in 40 primary SS, 40 rheumatoid arthritis (RA), and 38 systemic lupus erythematosus (SLE) patients and 20 healthy controls were measured. Serum IL-21 levels of SS patients were assessed for correlations with laboratory data, including anti-nuclear antibody, anti-Ro/La antibodies, globulin, immunoglobulin (Ig) class, and IgG subclass. LSGs from 16 primary SS and 4 controls with sicca symptoms were evaluated for IL-21 and IL-21 receptor (IL-21R) expression by immunohistochemistry. Confocal microscopy was performed to further characterize the IL-21 positive cells.Results
Primary SS patients had significantly higher serum IL-21 levels than controls, and these increments correlated positively with levels of IgG, IgG1. Serum IgG1 levels correlated with anti-Ro antibody titers. Immunohistochemical analyses showed that lymphocytic foci and the periductal area of the LSGs from SS patients expressed high levels of IL-21 and lower levels of IL-21R, whereas the control LSGs showed minimal expression of both antigens. The more the lymphocyte infiltrated, IL-21expression in LSGs showed a tendency to increase. Confocal microscopic analyses revealed that IL-21 expressing infiltrating lymphocytes in the LSGs of SS patients also expressed CXCR5.Conclusions
Primary SS is associated with high serum IL-21 levels that correlate positively with serum IgG, especially IgG1, levels. The expression of IL-21 is increased as more lymphocytes infiltrated in LSGs. These observations suggest that IL-21 may play an important role in primary SS pathogenesis. 相似文献48.
Bae S Kang T Hong J Lee S Choi J Jhun H Kwak A Hong K Kim E Jo S Kim S 《The Journal of biological chemistry》2012,287(11):8205-8213
IL-1 family ligand does not possess a typical hydrophobic signal peptide and needs a processing enzyme for maturation. The maturation process of IL-33 (IL-1F11), a new member of the IL-1 family ligand, remains unclear. Precursor IL-33 ligand affinity column isolates neutrophil proteinase 3 (PR3) from human urinary proteins. PR3 is a known IL-1 family ligand-processing enzyme for IL-1β (IL-1F2) and IL-18 (IL-1F4), including other inflammatory cytokines. We investigated PR3 in the maturation process of precursor IL-33 because we isolated urinary PR3 by using the precursor IL-33 ligand affinity column. PR3 converted inactive human and mouse precursor IL-33 proteins to biological active forms; however, the increase of PR3 incubation time abrogated IL-33 activities. Unlike caspase-1-cleaved precursor IL-18, PR3 cut precursor IL-33 and IL-18 at various sites and yielded multibands. The increased incubation period of PR3 abated mature IL-33 in a time-dependent manner. The result is consistent with the decreased bioactivity of IL-33 along with the increased PR3 incubation time. Six different human and mouse recombinant IL-33 proteins were expressed by the predicted consensus amino acid sequence of PR3 cleavage sites and tested for bioactivities. The human IL-33/p1 was highly active, but human IL-33/p2 and p3 proteins were inactive. Our results suggest the dual functions (activation/termination) of PR3 in IL-33 biological activity. 相似文献
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