Wyniki wyszukiwania

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Antibiotic therapy and fat digestion and absorption in cystic fibrosis

100%

Lisowska A., Pogorzelski A., Oracz G., Skorupa W., Cofta S., Szydlowski J., Socha J., Walkowiak J.

Acta Biochimica Polonica

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2011

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tom 58

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nr 3

Antibiotic therapy in the cystic fibrosis (CF) mouse model has been shown to result in reduced bacterial load of the intestine and significant body mass gain. The effect was suggested to be linked to the improvement of intestinal digestion and absorption. Therefore, we aimed to assess the influence of routinely applied antibiotic therapy in CF patients on fat assimilation. Twenty-four CF patients aged 6 to 30 years entered the study. Inclusion criteria comprised confirmed exocrine pancreatic insufficiency and bronchopulmonary exacerbation demanding antibiotic therapy. Exclusion criteria comprised: antibiotic therapy six weeks prior to the test, liver cirrhosis, diabetes mellitus, oxygen dependency, the use of systemic corticosteroids. In all enrolled CF subjects, 13C-labelled mixed triglyceride breath test (13C MTG-BT) was performed to assess lipid digestion and absorption, before and after antibiotic therapy. Sixteen subjects were treated intravenously with ceftazidime and amikacin, eight patients orally with ciprofloxacin. Cumulative percentage dose recovery (CPDR) was considered to reflect digestion and absorption of lipids. The values are expressed as means (medians). The values of CPDR before and after antibiotic therapy did not differ in the whole studied group [4.6(3.3) % vs. 5.7(5.3) %, p = 0.100] as well as in the subgroup receiving them intravenously [4.6(3.2) % vs. 5.7(5.3) %, p = 0.327] or in that with oral drug administration [4.6(3.4) % vs. 5.7(5.4) %, p = 0.167]. In conclusion, antibiotic therapy applied routinely in the course of pulmonary exacerbation in CF patients does not seem to result in an improvement of fat digestion and absorption.

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The immunosuppressive activities of newly synthesized azaphenothiazines in human and mouse models

84%

Zimecki M., Artym J., Kocieba M., Pluta K., Morak-Mlodawska B., Jelen M.

Cellular and Molecular Biology Letters

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2009

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tom 14

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nr 4

622-635

In this study, we evaluated the activities of new types of azaphenothiazines in the following immunological assays: the proliferative response of human peripheral blood mononuclear cells induced by phytohemagglutin A or anti-CD3 antibodies; lipopolysaccharide-induced cytokine production by human PBMC; the secondary, humoral immune response in mice to sheep erythrocytes (in vitro); and delayed-type hypersensitivity in mice to ovalbumin (in vivo). In some tests, chlorpromazine served as a reference drug. The compounds exhibited differential inhibitory activities in the proliferation tests, with 10H-2,7-diazaphenothiazine (compound 1) and 6-(3-dimethylaminopropyl)diquinothiazine (compound 8) being most suppressive. Compound 1 was selected for further studies, and was found to be strongly suppressive in the humoral immune response even at low concentrations (1 μg/ml). Compound 1 also inhibited the delayed-type hypersensitivity lipopolysaccharide-induced production of tumor necrosis factor and interleukin-6 in cultures of human blood cells. As there were only two subjects in this study, the effects of these compounds on human blood cells need to be confirmed. In this paper, we also discuss the structure-activity relationships of selected compounds.

3

The specific T-cell response to antigenic peptides is influenced by bystander peptides

84%

Nowak I., Pajtasz-Piasecka E., Chmielowski B., Ignatowicz L., Kusnierczyk P.

Cellular and Molecular Biology Letters

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2006

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tom 11

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nr 1

T lymphocytes recognize antigens in the form of peptides presented by major histocompatibility complex (MHC) molecules on the cell surface. Only a small proportion of MHC class I and class II molecules are loaded with foreign antigenic peptides; the vast majority are loaded with thousands of different self peptides. It was suggested that MHC molecules presenting self peptides may serve either to decrease (antagonistic effect) or increase (synergistic effect) the T cell response to a specific antigen. Here, we present our finding that transfected mouse fibroblasts presenting a single antigenic peptide covalently bound to a class II MHC molecule stimulated specific mouse T cell hybridoma cells to an interleukin-2 response less efficiently than fibroblasts presenting a similar amount of antigenic peptide in the presence of class II molecules loaded with heterogenous bystander peptides.

4

MHC class II positive microglia and lymhocytic infiltration are present in the substantia nigra and striatum in mouse model of Parkinson's disease

67%

Kurkowska-Jastrzebska I., Wronska A., Kohutnicka M., Czlonkowski A., Czlonkowska A.

Acta Neurobiologiae Experimentalis

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1999

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tom 59

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nr 1

5

Genetic models to study adult neurogenesis

67%

Filipkowski R. K., Kiryk A., Kowalczyk A., Kaczmarek L.

Acta Biochimica Polonica

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2005

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tom 52

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nr 2

In the central nervous system (CNS) generation of new neurons continues throughout adulthood, when it is limited to the olfactory bulb and hippocampus. The knowledge regarding the function of newly-generated neurons remains limited and is vigorously investigated using diverse approaches. Among these are genetically modified mice, most of them of knock-out type (KO). Results from 23 diverse KO mouse models demonstrate the importance of particular proteins (growth factors, nitric oxide synthases, receptors, cyclins/cyclin-associated proteins, transcription factors, etc.) in adult neurogenesis (ANGE) as well as separate it from developmental neurogenesis. These results bring us closer to revealing the function of newly generated neurons in adult brains.

Ograniczanie wyników

Antibiotic therapy and fat digestion and absorption in cystic fibrosis

The immunosuppressive activities of newly synthesized azaphenothiazines in human and mouse models

The specific T-cell response to antigenic peptides is influenced by bystander peptides

MHC class II positive microglia and lymhocytic infiltration are present in the substantia nigra and striatum in mouse model of Parkinson's disease

Genetic models to study adult neurogenesis