Methods for the ex vivo characterization of human CD8+ T subsets based on gene expression and replicative history analysis.

The generation of an antigen-specific T-lymphocyte response is a complex multi-step process. Upon T-cell receptor-mediated recognition of antigen presented by activated dendritic cells, naive T-lymphocytes enter a program of proliferation and differentiation, during the course of which they acquire effector functions and may ultimately become memory T-cells. A major goal of modern immunology is to precisely identify and characterize effector and memory T-cell subpopulations that may be most efficient in disease protection. Sensitive methods are required to address these questions in exceedingly low numbers of antigen-specific lymphocytes recovered from clinical samples, and not manipulated in vitro. We have developed new techniques to dissect immune responses against viral or tumor antigens. These allow the isolation of various subsets of antigen-specific T-cells (with major histocompatibility complex [MHC]-peptide multimers and five-color FACS sorting) and the monitoring of gene expression in individual cells (by five-cell reverse transcription-polymerase chain reaction [RT-PCR]). We can also follow their proliferative life history by flow-fluorescence in situ hybridization (FISH) analysis of average telomere length. Recently, using these tools, we have identified subpopulations of CD8+ T-lymphocytes with distinct proliferative history and partial effector-like properties. Our data suggest that these subsets descend from recently activated T-cells and are committed to become differentiated effector T-lymphocytes.

Urinary analysis of 16(5alpha)-androsten-3alpha-ol by gas chromatography/combustion/isotope ratio mass spectrometry: implications in anti-doping analysis.

We present a method for the analysis of urinary 16(5alpha)-androsten-3alpha-ol together with 5beta-pregnane-3alpha,20alpha-diol and four testosterone metabolites: androsterone (Andro), etiocholanolone (Etio), 5alpha-androstane-3alpha,17beta-diol (5alphaA), 5beta-androstane-3alpha,17beta-diol (5betaA) by means of gas chromatography/combustion/isotopic ratio mass spectrometry (GC/C/IRMS). The within-assay and between-assay precision S.D.s of the investigated steroids were lower than 0.3 and 0.6 per thousand, respectively. A comparative study on a population composed of 20 subjects has shown that the differences of the intra-individual delta(13)C-values for 16(5alpha)-androsten-3alpha-ol and 5beta-pregnane-3alpha,20alpha-diol are less than 0.9 per thousand. Thereafter, the method has been applied in the frame of an excretion study following oral ingestion of 50 mg DHEA initially and oral ingestion of 50mg pregnenolone 48 h later. Our findings show that administration of DHEA does not affect the isotopic ratio values of 16(5alpha)-androsten-3alpha-ol and 5beta-pregnane-3alpha,20alpha-diol, whereas the isotopic ratio values of 5beta-pregnane-3alpha,20alpha-diol vary by more 5 per thousand upon ingestion of pregnenolone. We have observed delta(13)C-value changes lower than 1 per thousand for 16(5alpha)-androsten-3alpha-ol, though pregnenolone is a precursor of the 16-ene steroids. In contrast to 5beta-pregnane-3alpha,20alpha-diol, the 16-ene steroid may be used as an endogenous reference compound when pregnenolone is administered.

Effective diagnosis of Alzheimer's disease by means of large margin-based methodology.

BACKGROUND Functional brain images such as Single-Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET) have been widely used to guide the clinicians in the Alzheimer's Disease (AD) diagnosis. However, the subjectivity involved in their evaluation has favoured the development of Computer Aided Diagnosis (CAD) Systems. METHODS It is proposed a novel combination of feature extraction techniques to improve the diagnosis of AD. Firstly, Regions of Interest (ROIs) are selected by means of a t-test carried out on 3D Normalised Mean Square Error (NMSE) features restricted to be located within a predefined brain activation mask. In order to address the small sample-size problem, the dimension of the feature space was further reduced by: Large Margin Nearest Neighbours using a rectangular matrix (LMNN-RECT), Principal Component Analysis (PCA) or Partial Least Squares (PLS) (the two latter also analysed with a LMNN transformation). Regarding the classifiers, kernel Support Vector Machines (SVMs) and LMNN using Euclidean, Mahalanobis and Energy-based metrics were compared. RESULTS Several experiments were conducted in order to evaluate the proposed LMNN-based feature extraction algorithms and its benefits as: i) linear transformation of the PLS or PCA reduced data, ii) feature reduction technique, and iii) classifier (with Euclidean, Mahalanobis or Energy-based methodology). The system was evaluated by means of k-fold cross-validation yielding accuracy, sensitivity and specificity values of 92.78%, 91.07% and 95.12% (for SPECT) and 90.67%, 88% and 93.33% (for PET), respectively, when a NMSE-PLS-LMNN feature extraction method was used in combination with a SVM classifier, thus outperforming recently reported baseline methods. CONCLUSIONS All the proposed methods turned out to be a valid solution for the presented problem. One of the advances is the robustness of the LMNN algorithm that not only provides higher separation rate between the classes but it also makes (in combination with NMSE and PLS) this rate variation more stable. In addition, their generalization ability is another advance since several experiments were performed on two image modalities (SPECT and PET).

Measuring and Explaining the Increase of Travel Distance : A Multilevel Analysis Using Repeated Cross Sectional Travel Surveys

We want to shed some light on the development of person mobility by analysing the repeated cross-sectional data of the four National Travel Surveys (NTS) that were conducted in Germany since the mid seventies. The above mentioned driving forces operate on different levels of the system that generates the spatial behaviour we observe: Travel demand is derived from the needs and desires of individuals to participate in spatially separated activities. Individuals organise their lives in an interactive process within the context they live in, using given infrastructure. Essential determinants of their demand are the individual's socio-demographic characteristics, but also the opportunities and constraints defined by the household and the environment are relevant for the behaviour which ultimately can be realised. In order to fully capture the context which determines individual behaviour, the (nested) hierarchy of persons within households within spatial settings has to be considered. The data we will use for our analysis contains information on these three levels. With the analysis of this micro-data we attempt to improve our understanding of the afore subsumed macro developments. In addition we will investigate the prediction power of a few classic sociodemographic variables for the daily travel distance of individuals in the four NTS data sets, with a focus on the evolution of this predictive power. The additional task to correctly measure distances travelled by means of the NTS is threatened by the fact that although these surveys measure the same variables, different sampling designs and data collection procedures were used. So the aim of the analysis is also to detect variables whose control corrects for the known measurement error, as a prerequisite to apply appropriate models in order to better understand the development of individual travel behaviour in a multilevel context. This task is complicated by the fact that variables that inform on survey procedures and outcomes are only provided with the data set for 2002 (see Infas and DIW Berlin, 2003).

A combined analysis of the short-term effects of photochemical air pollutants on mortality within the EMECAM project.

In recent years, some epidemiologic studies have attributed adverse effects of air pollutants on health not only to particles and sulfur dioxide but also to photochemical air pollutants (nitrogen dioxide and ozone). The effects are usually small, leading to some inconsistencies in the results of the studies. Furthermore, the different methodologic approaches of the studies used has made it difficult to derive generic conclusions. We provide here a quantitative summary of the short-term effects of photochemical air pollutants on mortality in seven Spanish cities involved in the EMECAM project, using generalized additive models from analyses of single and multiple pollutants. Nitrogen dioxide and ozone data were provided by seven EMECAM cities (Barcelona, Gijón, Huelva, Madrid, Oviedo, Seville, and Valencia). Mortality indicators included daily total mortality from all causes excluding external causes, daily cardiovascular mortality, and daily respiratory mortality. Individual estimates, obtained from city-specific generalized additive Poisson autoregressive models, were combined by means of fixed effects models and, if significant heterogeneity among local estimates was found, also by random effects models. Significant positive associations were found between daily mortality (all causes and cardiovascular) and NO(2), once the rest of air pollutants were taken into account. A 10 microg/m(3) increase in the 24-hr average 1-day NO(2)level was associated with an increase in the daily number of deaths of 0.43% [95% confidence interval (CI), -0.003-0.86%] for all causes excluding external. In the case of significant relationships, relative risks for cause-specific mortality were nearly twice as much as that for total mortality for all the photochemical pollutants. Ozone was independently related only to cardiovascular daily mortality. No independent statistically significant relationship between photochemical air pollutants and respiratory mortality was found. The results in this study suggest that, given the present levels of photochemical pollutants, people living in Spanish cities are exposed to health risks derived from air pollution.

A Factor analysis of hidrochemical composition of Llobregat river basin

Hydrogeological research usually includes some statistical studies devised to elucidate mean background state, characterise relationships among different hydrochemical parameters, and show the influence of human activities. These goals are achieved either by means of a statistical approach or by mixing modelsbetween end-members. Compositional data analysis has proved to be effective with the first approach, but there is no commonly accepted solution to the end-member problem in a compositional framework.We present here a possible solution based on factor analysis of compositions illustrated with a case study.We find two factors on the compositional bi-plot fitting two non-centered orthogonal axes to the most representative variables. Each one of these axes defines a subcomposition, grouping those variables thatlay nearest to it. With each subcomposition a log-contrast is computed and rewritten as an equilibrium equation. These two factors can be interpreted as the isometric log-ratio coordinates (ilr) of three hiddencomponents, that can be plotted in a ternary diagram. These hidden components might be interpreted as end-members.We have analysed 14 molarities in 31 sampling stations all along the Llobregat River and its tributaries, with a monthly measure during two years. We have obtained a bi-plot with a 57% of explained totalvariance, from which we have extracted two factors: factor G, reflecting geological background enhanced by potash mining; and factor A, essentially controlled by urban and/or farming wastewater. Graphicalrepresentation of these two factors allows us to identify three extreme samples, corresponding to pristine waters, potash mining influence and urban sewage influence. To confirm this, we have available analysisof diffused and widespread point sources identified in the area: springs, potash mining lixiviates, sewage, and fertilisers. Each one of these sources shows a clear link with one of the extreme samples, exceptfertilisers due to the heterogeneity of their composition.This approach is a useful tool to distinguish end-members, and characterise them, an issue generally difficult to solve. It is worth note that the end-member composition cannot be fully estimated but only characterised through log-ratio relationships among components. Moreover, the influence of each endmember in a given sample must be evaluated in relative terms of the other samples. These limitations areintrinsic to the relative nature of compositional data

Permanent demand excess as business strategy: an analysis of the Brazilian higher-education market

Many Higher Education Institutions (HEIs) establish tuition below the equilibrium price to generate permanent demand excess. This paper first adapts Becker’s (1991) theory to understand why the HEIs price in this way. The fact that students are both consumers and inputs on the education production process gives rise to a market equilibrium where some firms have excess demand and charge high prices, and others charge low prices and have empty seats.Second, the paper analyzes this equilibrium empirically. We estimated the demand for undergraduate courses in Business Administration in the State of São Paulo. The results show that tuition, quality of incoming students and percentage of lecturers holding doctorates degrees are the determining factors of students’ choice. Since the student quality determines the demand for a HEI, it is calculated what the value is for a HEI to get better students; that is the total revenue that each HEI gives up to guarantee excess demand. Regarding the “investment” in selectivity, 39 HEIs in São Paulo give up a combined R$ 5 million (or US$ 3.14 million) in revenue per year per freshman class, which means 7.6% of the revenue coming from a freshman class.

Functional analysis of disease-causing NR2E3 mutations

Purpose:We analyzed the transcriptional activity of disease-causing NR2E3 mutant proteins in a heterologous system. NR2E3 belongs to the nuclear receptor superfamily of transcription factors, characterized by evolutionary-conserved DNA-binding (DBD) and ligand-binding (LBD) domains. NR2E3 acts in concert with the transcription factors CRX and NRL to repress cone-specific genes and activate rod-specific genes in rod photoreceptors. During development, NR2E3 is also required to suppress cone cell generation from retinal progenitor cells. In humans, mutations in NR2E3 have been associated with the recessively inherited enhanced short wavelength sensitive (S-) cone syndrome (ESCS), the Goldman-Favre syndrome, and, more recently, with autosomal dominant retinitis pigmentosa (adRP). Methods:The different NR2E3 mutants were generated by QuickChangeR mutagenesis and analyzed by transfection in heterologous HEK293T cells. Results:In transactivation assays in HEK293T cells, the adRP-linked p.G56R mutant protein exhibited a more severe effect both in activation of a rhodopsin promoter reporter construct and in repression of M-opsin promoter reporter construct, than the ESCS-linked R76Q, R76W, G88V, R97H, R104Q, R104W mutants of the DBD. In contrast, the ESCS-linked p.R311Q mutant of the LBD behaved like the NR2E3 wild-type protein in these assays. By co-expressing the corepressors atrophin-1 and -2, a differential repression of the M-opsin promoter was observed in presence of the p.R311Q, p.R385P and p.M407K. Interestingly, corepressor expression also affected the activity of CRX, but not NRL, in both rhodopsin and M-opsin transactivation assays. Conclusions:Taken together, these in vitro results suggest a distinct disease mechanism for the adRP-linked mutation, but open the possibility of different mechanisms for the development of ESCS that is clinically characterized by important phenotypic variations.

Diversity of the bacterial community in the surface soil of a pear orchard based on 16S rRNA gene analysis

A cultivation-independent approach based on polymerase chain reaction (PCR)-amplified partial small subunit rRNA genes was used to characterize bacterial populations in the surface soil of a commercial pear orchard consisting of different pear cultivars during two consecutive growing seasons. Pyrus communis L. cvs Blanquilla, Conference, and Williams are among the most widely cultivated cultivars in Europe and account for the majority of pear production in Northeastern Spain. To assess the heterogeneity of the community structure in response to environmental variables and tree phenology, bacterial populations were examined using PCR-denaturing gradient gel electrophoresis (DGGE) followed by cluster analysis of the 16S ribosomal DNA profiles by means of the unweighted pair group method with arithmetic means. Similarity analysis of the band patterns failed to identify characteristic fingerprints associated with the pear cultivars. Both environmentally and biologically based principal-component analyses showed that the microbial communities changed significantly throughout the year depending on temperature and, to a lesser extent, on tree phenology and rainfall. Prominent DGGE bands were excised and sequenced to gain insight into the identities of the predominant bacterial populations. Most DGGE band sequences were related to bacterial phyla, such as Bacteroidetes, Cyanobacteria, Acidobacteria, Proteobacteria, Nitrospirae, and Gemmatimonadetes, previously associated with typical agronomic crop environments

Nuclear relaxation contribution to static and dynamic (infinite frequency approximation) nonlinear optical properties by means of electrical property expansions: Application to HF, CH4, CF4, and SF6

Electrical property derivative expressions are presented for the nuclear relaxation contribution to static and dynamic (infinite frequency approximation) nonlinear optical properties. For CF4 and SF6, as opposed to HF and CH4, a term that is quadratic in the vibrational anharmonicity (and not previously evaluated for any molecule) makes an important contribution to the static second vibrational hyperpolarizability of CF4 and SF6. A comparison between calculated and experimental values for the difference between the (anisotropic) Kerr effect and electric field induced second-harmonic generation shows that, at the Hartree-Fock level, the nuclear relaxation/infinite frequency approximation gives the correct trend (in the series CH4, CF4, SF6) but is of the order of 50% too small

Tandem chimeric transcription as a means to increase protein diversity in the human genome

The “one-gene, one-protein” rule, coined by Beadle and Tatum, has been fundamental to molecular biology. The rule implies that the genetic complexity of an organism depends essentially on its gene number. The discovery, however, that alternative gene splicing and transcription are widespread phenomena dramatically altered our understanding of the genetic complexity of higher eukaryotic organisms; in these, a limited number of genes may potentially encode a much larger number of proteins. Here we investigate yet another phenomenon that may contribute to generate additional protein diversity. Indeed, by relying on both computational and experimental analysis, we estimate that at least 4%–5% of the tandem gene pairs in the human genome can be eventually transcribed into a single RNA sequence encoding a putative chimeric protein. While the functional significance of most of these chimeric transcripts remains to be determined, we provide strong evidence that this phenomenon does not correspond to mere technical artifacts and that it is a common mechanism with the potential of generating hundreds of additional proteins in the human genome.

Labeling Regulations and Segregation of First- and, Second-Generation Genetically Modified Products: Innovation Incentives and Welfare Effects, April 2005

We review some of the most significant issues and results on the economic effects of genetically modified (GM) product innovation, with emphasis on the question of GM labeling and the need for costly segregation and identity preservation activities. The analysis is organized around an explicit model that can accommodate the features of both first-generation and second-generation GM products. The model accounts for the proprietary nature of GM innovations and for the critical role of consumer preferences vis-à-vis GM products, as well as for the impacts of segregation and identity preservation and the effects of a mandatory GM labeling regulation. We also investigate briefly a novel question in this setting, the choice of “research direction”when both cost-reducing and quality-enhancing GM innovations are feasible.

Generation of reconstituted human plasma-derived secretory-like IgA and IgM and their protective effect on intestinal epithelium

Les muqueuses sont les membranes tapissant les cavités du corps, tel que le tube digestif, et sont en contact direct avec l'environnement extérieur. Ces surfaces subissent de nombreuses agressions pouvant être provoquées par des agents pathogènes (bactéries, toxines ou virus). Cela étant, les muqueuses sont munies de divers mécanismes de protection dont notamment deux protéines-clés permettant de neutraliser les agents pathogènes : les anticorps ou immunoglobulines sécrétoires A (SIgA) et M (SIgM). Ces anticorps sont, d'une part, fabriqués au niveau de la muqueuse sous forme d'IgA et IgM. Lorsqu'ils sont sécrétés dans l'intestin, ils se lient à une protéine appelée pièce sécrétoire et deviennent ainsi SIgA et SïgM. La présence de la pièce sécrétoire est essentielle pour que les anticorps puissent fonctionner au niveau de la muqueuse. D'autre part, ces anticorps sont également fabriqués dans d'autres parties du corps en général et se retrouvent dans le sang sous forme d'IgA et IgM Chez l'homme, des thérapies basées sur l'injection d'anticorps donnent de bons résultats depuis de nombreuses années notamment dans le traitement des infections. Bien qu'un certain nombre d'études ont montré le rôle protecteur des anticorps de type IgA et IgM, ceux-ci ne sont que rarement utilisés dans les thérapies actuelles. La principale raison de cette faible utilisation réside dans la production ou la purification des IgA/IgM ou SIgA/SIgM (la forme active au niveau des muqueuses) qui est difficile à réaliser à large échelle. Ainsi, le but de la thèse était (1) d'étudier la possibilité d'employer des IgA et des IgM provenant du sang humain pour générer des SIgA et SIgM et (2) de voir si ces anticorps reconstitués pouvaient neutraliser certains agents pathogènes au niveau des muqueuses. Tout d'abord, une analyse biochimique des IgA et des IgM issues du sang a été effectuée. Nous avons observé que ces anticorps avaient des caractéristiques similaires aux anticorps naturellement présents au niveau des muqueuses. De plus, nous avons confirmé que ces anticorps pouvaient être associés à une pièce sécrétoire produite en laboratoire pour ainsi donner des SIgA et SIgM reconstituées. Ensuite, la fonctionnalité des anticorps reconstitués a été testée grâce à un modèle de couche unique de cellules intestinales différenciées (monocouches) en laboratoire imitant la paroi de l'intestin. Ces monocouches ont été infectées par une bactérie pathogène, Shigella flexneri, responsable de la shigellose, une maladie qui provoque des diarrhées sanglantes chez l'homme. L'infection des monocouches par les bactéries seules ou combinées aux SIgA et SIgM reconstituées a été analysée. Nous avons observé que les dommages des cellules étaient moins importants lorsque les SIgA étaient présentes. Il apparaît que les SIgA neutralisent les bactéries en se fixant dessus, ce qui provoque leur agrégation, et diminuent l'inflammation des cellules. La protection s'est montrée encore plus efficace avec les SIgM. De plus, nous avons vu que les SIgA et SIgM pouvaient diminuer la sécrétion de facteurs nocifs produits par les bactéries. Utilisant le même modèle des monocouches, la fonctionnalité des IgA issues du sang humain a aussi été testée contre une toxine sécrétée par une bactérie appelée Clostridium diffìcile. Cette bactérie peut être présente naturellement dans l'intestin de personnes saines, cependant elle peut devenir pathogène dans certaines conditions et être à l'origine de diarrhées et d'inflammations de l'intestin via la sécrétion de toxines. Des préparations d'anticorps contenant une certaine proportion de SIgA reconstituées ont amené à une diminution des dommages et de l'inflammation des monocouches causés par la toxine. L'ensemble de ces résultats prometteurs, montrant que des SIgA et SIgM reconstituées peuvent protéger la paroi de l'intestin des infections bactériennes, nous conduisent à approfondir la recherche sur ces anticorps dans des modèles animaux. L'aboutissement de ce type de recherche permettrait de tester, par la suite, l'efficacité sur l'homme de traitements des infections des muqueuses par injection d'anticorps de type SIgA et SIgM reconstituées. Les muqueuses, telle que la muqueuse gastrointestinale, sont des surfaces constamment exposées à l'environnement et leur protection est garantie par une combinaison de barrières mécaniques, physicochimiques et immunologiques. Parmi les divers mécanismes de protection immunologiques, la réponse humorale spécifique joue un rôle prépondérant et est assurée par les immunoglobulines sécrétoires de type A (SIgA) et M (SIgM). Les thérapies basées sur l'administration d'IgG apportent d'importants bénéfices dans le domaine de la santé. Bien que des études sur les animaux aient montré que l'administration par voie muqueuse d'IgA polymérique (plgA) ou SIgA pouvaient protéger des infections, des IgA/SIgA n'ont été utilisées qu'occasionnellement dans les thérapies. De plus, des études précliniques et cliniques ont démontré que l'administration par voie systémique de préparations enrichies en IgM pouvait aussi protéger des infections. Cependant, l'administration par voie muqueuse d'IgM/SIgM purifiées n'a pas été examinée jusqu'à présent. La principale raison est que la purification ou là production des IgA/SIgA et IgM/SIgM est difficile à réaliser à large échelle. Le but de ce travail de thèse était d'examiner la possibilité d'associer des IgA et IgM polyclonals purifiées à partir du plasma humain avec une pièce sécrétoire recombinante humaine afin de générer des SIgA et SIgM reconstituées fonctionnelles. Tout d'abord, une analyse biochimique des IgA et IgM issues du plasma humain a été effectuée par buvardage de western et Chromatographie. Ces molécules avaient des caractéristiques biochimiques similaires à celles des immunoglobulines issues de la muqueuse. L'association entre plgA ou IgM issues du plasma humain et la pièce sécrétoire recombinante humaine a été confirmée, ainsi que la stoechiométrie 1:1 de l'association. Comme dans les conditions physiologiques, cette association permettait de retarder la dégradation des SIgA et SIgM reconstituées exposées à des protéases intestinales. Ensuite, la fonctionnalité et le mode d'action des IgA et IgM issues du plasma humain, ainsi que des SIgA et SIgM reconstituées, ont été explorés grâce à un modèle in vitro de monocouches de cellules intestinales épithéliales polarisées de type Caco-2, qui imite l'épithélium intestinal. Les monocouches ont été infectées par un pathogène entérique, Shigella flexneri, seul ou combiné aux immunoglobulines issues du plasma humain ou aux immunoglobulines sécrétoires reconstituées. Bien que les dommages des monocouches aient été retardés par les plgA et SIgA reconstituées, les IgM et SIgM reconstituées se sont montrées supérieures dans le maintien de l'intégrité des cellules. Une agrégation bactérienne et une diminution de l'inflammation des monocouches ont été observées avec les plgA et SIgA reconstituées. Ces effets étaient augmentés avec les IgM et SIgM reconstituées. De plus, il s'est révélé que les deux types d'immunoglobulines de type sécrétoire reconstituées agissaient directement sur la virulence des bactéries en réduisant leur sécrétion de facteurs de virulence. La fonctionnalité des IgA issues du plasma humain a aussi été testée contre la toxine A de Clostridium difficile grâce au même modèle de monocouches de cellules épithéliales. Nous avons démontré que des préparations enrichies en IgA provenant du plasma humain pouvaient diminuer les dommages et l'inflammation des monocouches induits par la toxine. L'ensemble de ces résultats démontrent que des IgA et IgM de type sécrétoire peuvent être générées à partir d'IgA et IgM issues du plasma humain en les associant à la pièce sécrétoire et que ces molécules protègent l'épithélium intestinal contre des bactéries pathogènes. Ces molécules pourraient dès lors être testées dans des modèles in vivo. Le but final serait de les utiliser chez l'homme à des fins d'immunisation passive dans le traitement de pathologies associées à la muqueuse telles que les infections. - Mucosal surfaces, such as gastrointestinal mucosa, are constantly exposed to the external environment and their protection is ensured by a combination of mechanical, physicochemical and immunological barriers. Among the various immunological defense mechanisms, specific humoral mucosal response plays a crucial role and is mediated by secretory immunoglobulins A (SIgA) and M (SIgM). Immunoglobulin therapy based on the administration of IgG molecules leads important health benefits. Even though animal studies have shown that mucosal application of polymeric IgA (plgA) or SIgA provided protection against infections, IgA/SIgA have been only used occasionally for therapeutic application. Moreover, preclinical and clinical studies have demonstrated that systemic administration of IgM-enriched preparations could also afford protection against infections. Nevertheless, mucosal application of purified IgM/SIgM has not been examined. The main reason is that the purification or production of IgA/SIgA and IgM/SIgM at large scale is difficult to achieve. The aim of this PhD project was to examine the possibility to associate polyclonal human plasma-derived IgA and IgM with recombinant human secretory component (SC) to generate functional secretoiy-like IgA and IgM. First, biochemical analysis of human plasma IgA and IgM was performed by western blotting and chromatography. These molecules exhibited the same biochemical features as mucosa-derived antibodies (Abs). The association between human plasma plgA or IgM and recombinant human SC was confirmed, as well as the 1:1 stoichiometry of association. Similarly to physiological conditions, this association delayed the degradation of secretory-like IgA or IgM by intestinal proteases. Secondly, the function activity and the mode of action of human plasma IgA and IgM, as well as secretory-like IgA and IgM were explored using an in vitro model of polarized intestinal epithelial Caco-2 cell monolayers mimicking intestinal epithelium. Cell monolayers were infected with an enteropathogen, Shigella flexneri, alone or in combination to plasma Abs or secretory-like Abs. Even though plasma plgA and secretoiy-like IgA resulted in a delay of bacteria-induced damages of cell monolayers, plasma IgM and secretory-like IgM were shown to be superior in maintenance of cell integrity. Polymeric IgA and secretory-like IgA induced bacterial aggregation and decreased cell monolayer inflammation, effects further amplified with IgM and secretory-like IgM. In addition, both secretory-like Abs directly impacted on bacterial virulence leading to a reduction in secretion of virulence factors by bacteria. The functionality of human plasma IgA was also tested against Clostridium difficile toxin A using Caco-2 cell monolayers. Human plasma IgA- enriched preparations led to a diminution of cell monolayer damages and a decrease of cellular inflammation induced by the toxin. The sum of these results demonstrates that secretory-like IgA and IgM can be generated from purified human plasma IgA and IgM associated to SC and that these molecules are functional to protect intestinal epithelium from bacterial infections. These molecules could be now tested using in vivo models. The final goal would be to use them by passive immunization in the treatment of mucosa-associated pathologies like infections in humans.

Bilinear models for spatio-temporal point distribution analysis: application to extrapolation of left ventricular, biventricular and whole heart cardiac dynamics

In this work we describe the usage of bilinear statistical models as a means of factoring the shape variability into two components attributed to inter-subject variation and to the intrinsic dynamics of the human heart. We show that it is feasible to reconstruct the shape of the heart at discrete points in the cardiac cycle. Provided we are given a small number of shape instances representing the same heart atdifferent points in the same cycle, we can use the bilinearmodel to establish this. Using a temporal and a spatial alignment step in the preprocessing of the shapes, around half of the reconstruction errors were on the order of the axial image resolution of 2 mm, and over 90% was within 3.5 mm. From this, weconclude that the dynamics were indeed separated from theinter-subject variability in our dataset.

Determination of Vasopressin and Desmopressin in urine by means of liquid chromatography coupled to quadrupole time-of-flight mass spectrometry for doping control purposes.

The anti-diuretic neurohypophysial hormone Vasopressin (Vp) and its synthetic analogue Desmopressin (Dp, 1-desamino-vasopressin) have received considerable attention from doping control authorities due to their impact on physiological blood parameters. Accordingly, the illicit use of Desmopressin in elite sport is sanctioned by the World Anti-Doping Agency (WADA) and the drug is classified as masking agent. Vp and Dp are small (8-9 amino acids) peptides administered orally as well as intranasally. Within the present study a method to determine Dp and Vp in urinary doping control samples by means of liquid chromatography coupled to quadrupole high resolution time-of-flight mass spectrometry was developed. After addition of Lys-Vasopressin as internal standard and efficient sample clean up with a mixed mode solid phase extraction (weak cation exchange), the samples were directly injected into the LC-MS system. The method was validated considering the parameters specificity, linearity, recovery (80-100%), accuracy, robustness, limit of detection/quantification (20/50 pg mL(-1)), precision (inter/intra-day<10%), ion suppression and stability. The analysis of administration study urine samples collected after a single intranasal or oral application of Dp yielded in detection windows for the unchanged target analyte for up to 20 h at concentrations between 50 and 600 pg mL(-1). Endogenous Vp was detected in concentrations of approximately 20-200 pg mL(-1) in spontaneous urine samples obtained from healthy volunteers. The general requirements of the developed method provide the characteristics for an easy transfer to other anti-doping laboratories and support closing another potential gap for cheating athletes.