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David T. Evans Marian S. Piekarczyk Luis Cadavid Virginia S. Hinshaw D. I. Watkins 《Immunogenetics》1998,47(3):206-211
The products of the highly polymorphic and variable major histocompatibility complex (MHC) class I loci play a crucial role
in host defenses against infectious disease. While similar alleles have been found in closely related species, sharing of
a functional MHC class I allele between two species has never been reported. Here we show that an identical functional MHC
class I molecule is present in two different primate species with an approximate divergence time of 0.7 million years. Lymphocytes
from the red-crested tamarin (Saguinus geoffroyi) expressed an MHC class I allele (Sage-G
*
01) that was identical in coding sequence to an MHC class I allele (Saoe-G
*
08) found in the cotton-top tamarin (Saguinus oedipus). Furthermore, influenza virus-specific cytotoxic T lymphocytes (CTLs) generated in the cotton-top tamarin killed lymphocytes
expressing the influenza virus nucleoprotein (NP) from the red-crested tamarin. Since the influenza virus NP epitope is bound
by Saoe-G*08 in the cotton-top tamarin, it is likely that this molecule is functional in both species. These data provide the first
evidence that functional MHC class I molecules can be maintained entirely intact in two separate species.
Received: 6 June 1997 / Revised: 21 July 1997 相似文献
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María Isabel Nieto María Carmen Balo José Brea Olga Caamaño María Isabel Cadavid Franco Fernández Xerardo García Mera Carmen López José Enrique Rodríguez-Borges 《Bioorganic & medicinal chemistry》2009,17(9):3426-3432
In order to identify a high-affinity, selective antagonist for the A2B subtype adenosine receptor, more than 40 1,8-disubstituted-3-(3-methoxypropyl) xanthines were prepared and evaluated for their binding affinity at recombinant human adenosine receptors, mainly of the A2A and A2B subtypes. Some of the 1-ethyl-3-(3-methoxypropyl)-8-aryl substituted derivatives 15(a–m) showed moderate-to-high affinity at human A2B receptors, with compound 15d showing A2B selectivity over the other A receptors assayed (A1, A2A, A3) of 34-fold or over. 相似文献
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Cadavid Isabel Cristina Giraldo Carlos E. Balbinott Natalia González Mailyn Adriana Uribe Sandra Inés de Boer Hugo J. 《Journal of plant biochemistry and biotechnology.》2022,31(4):938-952
Journal of Plant Biochemistry and Biotechnology - Solanum is the largest and most diverse genus of the Solanaceae family. The genus includes around 1,400 species, and almost a third belong to... 相似文献
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The red death meets the abdominal bristle: Polygenic mutation for susceptibility to a bacterial pathogen in Caenorhabditis elegans
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Veronique Etienne Erik C. Andersen José Miguel Ponciano Dustin Blanton Analucia Cadavid Joanna Joyner‐Matos Chikako Matsuba Brandon Tabman Charles F. Baer 《Evolution; international journal of organic evolution》2015,69(2):508-519
Understanding the genetic basis of susceptibility to pathogens is an important goal of medicine and of evolutionary biology. A key first step toward understanding the genetics and evolution of any phenotypic trait is characterizing the role of mutation. However, the rate at which mutation introduces genetic variance for pathogen susceptibility in any organism is essentially unknown. Here, we quantify the per‐generation input of genetic variance by mutation (VM) for susceptibility of Caenorhabditis elegans to the pathogenic bacterium Pseudomonas aeruginosa (defined as the median time of death, LT50). VM for LT50 is slightly less than VM for a variety of life‐history and morphological traits in this strain of C. elegans, but is well within the range of reported values in a variety of organisms. Mean LT50 did not change significantly over 250 generations of mutation accumulation. Comparison of VM to the standing genetic variance (VG) implies a strength of selection against new mutations of a few tenths of a percent. These results suggest that the substantial standing genetic variation for susceptibility of C. elegans to P. aeruginosa can be explained by polygenic mutation coupled with purifying selection. 相似文献
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Background
Retrospective single center natural history studies have shown that times to reach disability milestones and ages at which they are reached are similar in primary (PPMS) and secondary (SPMS) progressive multiple sclerosis suggesting that they may be phenotypic variations of the same disease.Objective
Here we compared longitudinal disease activity in SPMS and PPMS in the context of international multicenter clinical trials.Methods
We analyzed all objective outcome measures that were systematically collected over 2 years for all subjects randomized to placebo arms in one SPMS and one PPMS clinical trial over the last decade. Conventional and exploratory definitions of clinical disease activity were used. Disease activity was analyzed in 3 different categories intermittent activity, progression, and improvement. Conventional MRI measures and one patient reported outcome measure of quality of life were included when available for comparison. Heat maps were drawn for all results followed by hierarchical clustering.Results
There were 101 outcome variables from 206 SPMS subjects and 79 outcome variables from 135 PPMS subjects. The comparison revealed that SPMS and PPMS subjects exhibited similar disease activity over 2 years in all but two of the variables in common worsening in the EDSS sensory system was more common in PPMS while worsening on the 9 hole PEG was more common in SPMS. Intermittent activity was the most common pattern of disease activity in SPMS and PPMS. Clinical worsening and improvement occurred at similar frequency in both.Conclusion
Longitudinal disease activity was nearly identical in SPMS and PPMS subjects in the context of the two multicenter international clinical trials we examined. 相似文献7.
Londoño D Marques A Hornung RL Cadavid D 《Journal of immunology (Baltimore, Md. : 1950)》2008,181(3):2076-2083
During relapsing fever borreliosis, a high pathogen load in the blood occurs at times of peak bacteremia. Specific IgM Abs are responsible for spirochetal clearance so in absence of B cells there is persistent high-level bacteremia. Previously, we showed that B cell-deficient mice persistently infected with Borrelia turicatae produce high levels of IL-10 and that exogenous IL-10 reduces bacteremia. This suggested that IL-10 helps reduce bacteremia at times of high pathogen load by a B cell-independent mechanism, most likely involving innate immunity. To investigate this possibility, we compared B. turicatae infection in RAG2/IL-10(-/-) and RAG2(-/-) mice. The results showed that IL-10 deficiency resulted in significantly higher bacteremia, higher TNF levels, and early mortality. Examination of the spleen and peripheral blood showed markedly increased apoptosis of immune cells in infected RAG2/IL-10(-/-) mice. Neutralization of TNF reduced apoptosis of leukocytes and splenocytes, increased production of IFN-gamma by NK cells, increased phagocytosis in the spleen, decreased spirochetemia, and rescued mice from early death. Our results indicate that at times of high pathogen load, as during peak bacteremia in relapsing fever borreliosis, IL-10 protects innate immune cells from apoptosis via inhibition of TNF resulting in improved pathogen control. 相似文献
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Field trial was conducted to study the effects of quality of planting material and prolonged water stress on leaf gas exchange of the cassava (Manihot esculenta Crantz) cultivar M Col 1684. Nutrient contents of planting material affected rootlet formation, but not leaf gas exchange. Net photosynthetic rate (PN), stomatal conductance (gs), and intercellular CO2 concentration (Ci) were significantly reduced by prolonged water stress. New leaves developed after recovery from water stress showed higher PN and gs, as compared to leaves of similar ages of unstressed plants. The higher PN was associated with higher leaf nutrient contents, indicating that photosynthetic capacity was enhanced in these leaves. These compensating characteristics may partly explain the small yield reduction often observed in stressed cassava. 相似文献
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Anny Cárdenas Luis M Rodriguez-R Valeria Pizarro Luis F Cadavid Catalina Arévalo-Ferro 《The ISME journal》2012,6(3):502-512
Coral reefs are deteriorating at an alarming rate mainly as a consequence of the emergence of coral diseases. The white plague disease (WPD) is the most prevalent coral disease in the southwestern Caribbean, affecting dozens of coral species. However, the identification of a single causal agent has proved problematic. This suggests more complex etiological scenarios involving alterations in the dynamic interaction between environmental factors, the coral immune system and the symbiotic microbial communities. Here we compare the microbiome of healthy and WPD-affected corals from the two reef-building species Diploria strigosa and Siderastrea siderea collected at the Tayrona National Park in the Caribbean of Colombia. Microbiomes were analyzed by combining culture-dependent methods and pyrosequencing of 16S ribosomal DNA (rDNA) V5-V6 hypervariable regions. A total of 20 410 classifiable 16S rDNA sequences reads were obtained including all samples. No significant differences in operational taxonomic unit diversity were found between healthy and affected tissues; however, a significant increase of Alphaproteobacteria and a concomitant decrease in the Beta- and Gammaproteobacteria was observed in WPD-affected corals of both species. Significant shifts were also observed in the orders Rhizobiales, Caulobacteriales, Burkholderiales, Rhodobacterales, Aleteromonadales and Xanthomonadales, although they were not consistent between the two coral species. These shifts in the microbiome structure of WPD-affected corals suggest a loss of community-mediated growth control mechanisms on bacterial populations specific for each holobiont system. 相似文献
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