Characterization of the specific response to serotonin of mouse tumour-feeding arterioles

1998 ◽  
Vol 74 (3) ◽  
pp. 379-386 ◽  
Author(s):  
E. LAEMMEL O. STUCKER P.-L. DARMON E.
2000 ◽  
Vol 68 (12) ◽  
pp. 6624-6632 ◽  
Author(s):  
K. Ross Turbyfill ◽  
Antoinette B. Hartman ◽  
Edwin V. Oaks

ABSTRACT The invasiveness and virulence of Shigella spp. are largely due to the expression of plasmid-encoded virulence factors, among which are the invasion plasmid antigens (Ipa proteins). After infection, the host immune response is directed primarily against lipopolysaccharide (LPS) and the virulence proteins (IpaB, IpaC, and IpaD). Recent observations have indicated that the Ipa proteins (IpaB, IpaC, and possibly IpaD) form a multiprotein complex capable of inducing the phagocytic event which internalizes the bacterium. We have isolated a complex of invasins and LPS from water-extractable antigens of virulent shigellae by ion-exchange chromatography. Western blot analysis of the complex indicates that all of the major virulence antigens of Shigella, including IpaB, IpaC, and IpaD, and LPS are components of this macromolecular complex. Mice or guinea pigs immunized intranasally with purified invasin complex (invaplex), without any additional adjuvant, mounted a significant immunoglobulin G (IgG) and IgA antibody response against theShigella virulence antigens and LPS. The virulence-specific response was very similar to that previously noted in primates infected with shigellae. Guinea pigs (keratoconjunctivitis model) or mice (lethal lung model) immunized intranasally on days 0, 14, and 28 and challenged 3 weeks later with virulent shigellae were protected from disease (P < 0.01 for both animal models).


2000 ◽  
Vol 63 (6) ◽  
pp. 1881-1892 ◽  
Author(s):  
Jean-Jacques Lareyre ◽  
Kim Reid ◽  
Colleen Nelson ◽  
Susan Kasper ◽  
Paul S. Rennie ◽  
...  

2016 ◽  
Vol 13 (1-2) ◽  
Author(s):  
Vesna Gojković ◽  
Mirjana Beribaka ◽  
Željka Marjanović-Balaban

Allergens are substances that cause allergic reactions. Allergic reactions differ from person to person in a sensitive and specific response to the presence of the same allergen. Groceries that often cause allergies are cow’s milk, eggs, fish, crustaceans and shellfish, wheat, soy, peanuts, walnuts, almonds, hazelnuts and strawberries.Organisation is the main factor for the success and the quality of a research in food industry laboratories, in order to detect the presence of allergens. All kinds of equipments are needed, as well as professional staff to perform the tests. Allergen testing in the food industry is often performed using biochemical and separation methods. For analysis of deoxyribonucleic acid (DNA), the most suitable method is polymerase chain reaction (PCR) and electrophoresis. In our laboratory, we use immunological methods for qualitative and quantitative testing of allergens and we have two accredited methods: Enzyme-Linked Immunosorbent Assays (ELISA) and High Performance Liquid Chromatography (HPLC). It is also necessary that stuff have adequate competence in handling the specific equipment, performing tests, evaluating the results and signing test reports and calibration certificates, have adequate competences. Laboratory have to prove that have been fulfiled all the requirements for validation. Validation includes: specification of requirements, characterization of method, verification that requirements can be fulfilled using the method.The results of each test are presented in form of a report, which has to be correct, clear, unambiguous, objective and must include all the informations required by the client.


2006 ◽  
Vol 188 (14) ◽  
pp. 5177-5186 ◽  
Author(s):  
Bhushan V. Desai ◽  
Donald A. Morrison

ABSTRACT Natural genetic transformation in Streptococcus pneumoniae entails transcriptional activation of at least two sets of genes. One set of genes, activated by the competence-specific response regulator ComE, is involved in initiating competence, whereas a second set is activated by the competence-specific alternative sigma factor ComX and functions in DNA uptake and recombination. Here we report an initial characterization of CoiA, a ComX-dependent gene product that is induced during competence and is required for transformation. CoiA is widely conserved among gram-positive bacteria, and in streptococci, the entire coiA locus composed of four genes is conserved. By use of immunoblot assay, we show that, similar to its message, CoiA protein is transient, appearing at 10 min and largely disappearing by 30 min post-competence induction. Using complementation analysis, we establish that coiA is the only gene of this induced locus needed for transformability. We find no indication of CoiA having a role in regulating competence. Finally, using 32P- and 3H-labeled donor DNA, we demonstrate that a coiA mutant can internalize normal amounts of donor DNA compared to the wild-type strain but is unable to process it into viable transformants, suggesting a role for CoiA after DNA uptake, either in DNA processing or recombination.


2002 ◽  
Vol 47 (3) ◽  
pp. 562-570 ◽  
Author(s):  
Victor E. Yushmanov ◽  
Lei Wang ◽  
Serguei Liachenko ◽  
Pei Tang ◽  
Yan Xu

Geosciences ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 336
Author(s):  
Belvaux Myriam ◽  
Meza-Fajardo Kristel ◽  
Abad Jaime ◽  
Bertil Didier ◽  
Roullé Agathe ◽  
...  

In this paper, we describe recent studies for the geophysical and geomechanical characterization of soils in Hispaniola (Greater Antilles), an island threatened by the eventual rupture of major seismogenic fault systems. The investigations were performed for four different cities settled on complex geological formations in Haiti (Cap-Haïtien, Port-au-Prince) and the Dominican Republic (Santo Domingo, Santiago de los Caballeros). We present the complete methodology we implemented for mapping zones of homogeneous seismic response and for microzonation studies, but each main stage of investigation is described as it was conducted in one or two cities. Therefore, first we present our site-characterization technique applied to Santo Domingo and Santiago de los Caballeros, which is based on geotechnical data, geophysical multichannel analysis of surface waves, and ambient-noise recordings. Then we present the site-response analysis through numerical analysis with nonlinear soil models that we performed for the city of Cap-Haïtien. Finally, we describe the amplification factors for site-specific response spectra that we derived for the microzonation of Port-au-Prince. We argue for the implementation of a multidisciplinary approach built upon complementary field geological, geophysical, and geotechnical data rather than solely depending on geophysical measures for the characterization of VS30. In addition, we explore the compatibility of the soil classes recommended by the International Building Code (IBC) in the context of local seismic amplification.


Author(s):  
Danielle Duma ◽  
John A. Cidlowski

AbstractGlucocorticoids are necessary for life after birth and regulate numerous homeostatic functions in man, including glucose homeostasis, protein catabolism, skeletal growth, respiratory function, inflammation, development, behavior, and apoptosis. In a clinical setting, they are widely used as anti-inflammatory agents to control both acute and chronic inflammation. Unfortunately, owing to their broad range of physiological actions, patients treated with glucocorticoids for long periods of time experience a variety of serious side effects, including metabolic syndrome, bone loss, and psychiatric disorders including depression, mania, and psychosis. Our understanding of how one hormone or drug regulates all of these diverse processes is limited. Recent studies have shown that multiple glucocorticoid receptor isoforms are produced from one gene via combinations of alternative mRNA splicing and alternative translation initiation. These isoforms possess unique tissue distribution patterns and transcriptional regulatory profiles. Owing to variation in the N-terminal and C-terminal length of glucocorticoid receptor isoforms, different post-translational modifications including ubiquitination, phosphorylation, and sumoylation are predicted, contributing to the complexity of glucocorticoid signaling. Furthermore, increasing evidence suggests that unique glucocorticoid receptor isoform compositions within cells could determine the cell-specific response to glucocorticoids. In this review, we will outline the recent advances made in the characterization of the transcriptional activity and the selective regulation of apoptosis by the various glucocorticoid receptor isoforms.


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