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31.
Pascale Simard Hugo Galarneau Sébastien Marois Daniel Rusu Caroline D Hoemann Patrice E Poubelle Hani El-Gabalawy Maria JG Fernandes 《Arthritis research & therapy》2009,11(3):R74-10
Introduction
Osteoarthritis is characterized by the progressive destruction of cartilage in the articular joints. Novel therapies that promote resurfacing of exposed bone in focal areas are of interest in osteoarthritis because they may delay the progression of this disabling disease in patients who develop focal lesions. Recently, the addition of 80% deacetylated chitosan to cartilage microfractures was shown to promote the regeneration of hyaline cartilage. The molecular mechanisms by which chitosan promotes cartilage regeneration remain unknown. Because neutrophils are transiently recruited to the microfracture site, the effect of 80% deacetylated chitosan on the function of neutrophils was investigated. Most studies on neutrophils use preparations of chitosan with an uncertain degree of deacetylation. For therapeutic purposes, it is of interest to determine whether the degree of deacetylation influences the response of neutrophils to chitosan. The effect of 95% deacetylated chitosan on the function of neutrophils was therefore also investigated and compared with that of 80% deacetylated chitosan. 相似文献32.
JG Hansen W Gao J Dupuis GT O’Connor W Tang M Kowgier A Sood SA Gharib LJ Palmer M Fornage SR Heckbert BM Psaty SL Booth SUNLIGHT Consortium Patricia A Cassano 《Respiratory research》2015,16(1)
Background
Vitamin D is associated with lung function in cross-sectional studies, and vitamin D inadequacy is hypothesized to play a role in the pathogenesis of chronic obstructive pulmonary disease. Further data are needed to clarify the relation between vitamin D status, genetic variation in vitamin D metabolic genes, and cross-sectional and longitudinal changes in lung function in healthy adults.Methods
We estimated the association between serum 25-hydroxyvitamin D [25(OH)D] and cross-sectional forced expiratory volume in the first second (FEV1) in Framingham Heart Study (FHS) Offspring and Third Generation participants and the association between serum 25(OH)D and longitudinal change in FEV1 in Third Generation participants using linear mixed-effects models. Using a gene-based approach, we investigated the association between 241 SNPs in 6 select vitamin D metabolic genes in relation to longitudinal change in FEV1 in Offspring participants and pursued replication of these findings in a meta-analyzed set of 4 independent cohorts.Results
We found a positive cross-sectional association between 25(OH)D and FEV1 in FHS Offspring and Third Generation participants (P = 0.004). There was little or no association between 25(OH)D and longitudinal change in FEV1 in Third Generation participants (P = 0.97). In Offspring participants, the CYP2R1 gene, hypothesized to influence usual serum 25(OH)D status, was associated with longitudinal change in FEV1 (gene-based P < 0.05). The most significantly associated SNP from CYP2R1 had a consistent direction of association with FEV1 in the meta-analyzed set of replication cohorts, but the association did not reach statistical significance thresholds (P = 0.09).Conclusions
Serum 25(OH)D status was associated with cross-sectional FEV1, but not longitudinal change in FEV1. The inconsistent associations may be driven by differences in the groups studied. CYP2R1 demonstrated a gene-based association with longitudinal change in FEV1 and is a promising candidate gene for further studies.Electronic supplementary material
The online version of this article (doi:10.1186/s12931-015-0238-y) contains supplementary material, which is available to authorized users. 相似文献33.
34.
Robert Eustache Hounym Jacques Kabor Geoffrey Gimonneau Martin Bienvenu Somda Ernest Salou Antoine Abel Missihoun Zakaria Bengaly Vincent Jamonneau Alain Boulang 《PLoS neglected tropical diseases》2022,16(8)
BackgroundAnimal African Trypanosomosis (AAT) is a parasitic disease of livestock that has a major socio-economic impact in the affected areas. It is caused by several species of uniflagellate extracellular protists of the genus Trypanosoma mainly transmitted by tsetse flies: T. congolense, T. vivax and T. brucei brucei. In Burkina Faso, AAT hampers the proper economic development of the southwestern part of the country, which is yet the best watered area particularly conducive to agriculture and animal production. It was therefore important to investigate the extent of the infection in order to better control the disease. The objective of the present study was to assess the prevalence of trypanosome infections and collect data on the presence of tsetse flies.MethodsBuffy coat, Trypanosoma species-specific PCR, Indirect ELISA Trypanosoma sp and trypanolysis techniques were used on 1898 samples collected. An entomological survey was also carried out.ResultsThe parasitological prevalence of AAT was 1.1%, and all observed parasites were T. vivax. In contrast, the molecular prevalence was 23%, of which T. vivax was predominant (89%) followed by T. congolense (12.3%) and T. brucei s.l. (7.3%) with a sizable proportion as mixed infections (9.1%). T. brucei gambiense, responsible of sleeping sickness in humans, was not detected. The serological prevalence reached 49.7%. Once again T. vivax predominated (77.2%), but followed by T. brucei (14.7%) and T. congolense (8.1%). Seven samples, from six cattle and one pig, were found positive by trypanolysis. The density per trap of Glossina tachinoides and G. palpalis gambiensis was 1.2 flies.Conclusions/SignificanceOverall, our study showed a high prevalence of trypanosome infection in the area, pointing out an ongoing inadequacy of control measures. 相似文献
35.
The alcohol dehydrogenase (Adh) region from five planitibia subgroup
species of Hawaiian picture-wing Drosophila has been cloned. A total of 15
kb of DNA in and around the Adh gene has been compared among the five
species. Genetic distances were calculated to determine evolutionary
relationships. These distances agree with previous distances determined by
protein polymorphism and DNA hybridization techniques and can be
interpreted in terms of specific island colonization and speciation
(founder) events over the past 5 Myr. Examination of the restriction maps
of the cloned Adh region from the five species shows many instances of
small deletions, insertion of a transposable element in D. heteroneura, and
the existence of a highly variable region on the 3' side of the Adh gene.
Clustering relationships and rates of DNA change are calculated and
compared with the relationship found for other species of Drosophila.
相似文献
36.
Adama Gansane Issa Nebie Ouedraogo Noelie Bere Henry Issiaka Soulama Esperance Ouedraogo Jean-Baptiste Yaro Amidou Diarra Sombie Benjamin Amadou Tidiani Konate Alfred Tiono Sodiomon Bienvenu Sirima 《Memórias do Instituto Oswaldo Cruz》2013,108(5):644-650
During the season of high malaria transmission, most children are
infected by Plasmodium, which targets red blood cells (RBCs),
affecting haematological parameters. To describe these variations, we examined
the haematological profiles of two groups of children living in a
malaria-endemic area. A cross-sectional survey was conducted at the peak of the
malaria transmission season in a rural area of Burkina Faso. After informed
consent and clinical examination, blood samples were obtained from the
participants for malaria diagnosis and a full blood count. Of the 414 children
included in the analysis, 192 were not infected with
Plasmodium, whereas 222 were asymptomatic carriers of
Plasmodium infection. The mean age of the infected children
was 41.8 months (range of 26.4-57.2) compared to 38.8 months (range of
22.4-55.2) for the control group (p = 0.06). The asymptomatic infected children
tended to have a significantly lower mean haemoglobin level (10.8 g/dL vs. 10.4
g/dL; p < 0.001), mean lymphocyte count (4592/µL vs. 5141/µL; p = 0.004),
mean platelet count (266 x 103/µL vs. 385 x 103/µL; p < 0.001) and mean RBC
count (4.388 x 106/µL vs. 4.158 x 106/µL; p < 0.001) and a higher mean
monocyte count (1403/µL vs. 1192/µL; p < 0.001) compared to the control
group. Special attention should be applied when interpreting haematological
parameters and evaluating immune responses in asymptomatic infected children
living in malaria-endemic areas and enrolled in vaccine trials. 相似文献
37.
38.
Thomas H. A. Haverkamp Julien Lossouarn Olga Zhaxybayeva Jie Lyu Nadège Bienvenu Claire Geslin Camilla L. Nesbø 《Environmental microbiology》2021,23(11):7105-7120
Phylogenomic analyses of bacteria from the phylum Thermotogota have shown extensive lateral gene transfer with distantly related organisms, particularly with Firmicutes. One likely mechanism of such DNA transfer is viruses. However, to date, only three temperate viruses have been characterized in this phylum, all infecting bacteria from the Marinitoga genus. Here we report 17 proviruses integrated into genomes of bacteria belonging to eight Thermotogota genera and induce viral particle production from one of the proviruses. All except an incomplete provirus from Mesotoga fall into two groups based on sequence similarity, gene synteny and taxonomic classification. Proviruses of Group 1 are found in the genera Geotoga, Kosmotoga, Marinitoga, Thermosipho and Mesoaciditoga and are similar to the previously characterized Marinitoga viruses, while proviruses from Group 2 are distantly related to the Group 1 proviruses, have different genome organization and are found in Petrotoga and Defluviitoga. Genes carried by both groups are closely related to Firmicutes and Firmicutes (pro)viruses in phylogenetic analyses. Moreover, one of the groups show evidence of recent gene exchange and may be capable of infecting cells from both phyla. We hypothesize that viruses are responsible for a large portion of the observed gene flow between Firmicutes and Thermotogota. 相似文献
39.
Thierry Bienvenu 《Andrologie》2003,13(2):158-160
About 15% of couples worldwide are affected by reduced fertility. In 20% of cases of couple infertility, the problem can be predominantly attributed to the male. In 20% of cases, a genetic cause of male infertility can usually be identified. The main genetic causes are: autosomal and sex chromosomal abnormalities, microdeletions within regions of the Y-chromosome containing candidate gene families for spermatogenesis and mutations in theCFTR gene. However, despite enormous progress in the understanding of human reproductive physiology, the underlying cause of male infertility often cannot be elucidated. Candidate gene strategies, linkage analysis in large familial forms of male infertility, targeted mutagenesis in the mouse and studies of chromatin reorganization during spermatid maturation should provide rapid progress in our understanding of the genetic factors that contribute to male infertility, which may open up new approaches to the treatment of this condition. 相似文献
40.
Couvert P Poirier K Carrié A Chalas C Jouannet P Beldjord C Bienvenu T Chelly J Kerjean A 《BioTechniques》2003,34(2):356-362
The bisulfite genomic sequencing method is one of the most widely used techniques for methylation analysis in heterogeneous unbiased PCR, amplifying for both methylated and unmethylated alleles simultaneously. However, it requires labor-intensive and time-consuming cloning and sequencing steps. In the current study, we used a denaturing high-performance liquid chromatography (DHPLC) procedure in a complementary way with the bisulfite genomic sequencing to analyze the methylation of differentially methylated regions (DMRs) of imprinted genes. We showed reliable and reproducible results in distinguishing overall methylation profiles of DMRs regions of human SNRPN, H19, MEST/PEG1, LIT1, IGF2, TSSC5, WT1 antisense, and mouse H19, Mest/Peg1, Igf2R imprinted genes. These DHPLC profiles were in accordance with bisulfite genomic sequencing data and may serve as a type of "fingerprint," revealing the overall methylation status of DMRs associated with sample heterogeneity. We conclude that DHPLC analysis could be used to increase the throughput efficiency of methylation pattern analysis of imprinted genes after the bisulfite conversion of genomic DNA and unbiased PCR amplification. 相似文献