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1

Effect of recombinant IFN-gamma on IgE-dependent leukotriene generation by peripheral blood leukocytes in patients with pollinosis and asthma

100%
Krasnowska M., Medrala W., Malolepszy J., Krasnowski R.
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vol. 48
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issue 4
287-292
EN
Interferon gamma (IFN-gamma) is considered one of the causative and intensifying factors in inflammation. The reaction to allergens releases IFN-gamma, an immunomodulatory cytokine known to inhibit IgE synthesis and Th cell proliferation. The aim of the study was to evaluate the influence of IFN-gamma on leukotriene (LT) release in vitro, from human leukocytes of atopic patients with pollinosis and asthma. Thirty-eight patients were enrolled in the study: 15 with pollinosis and 23 asthmatics. In the presence of IL-3, leukocytes were stimulated with specific allergens. Other samples of leukocytes were preincubated with different concentrations of IFN-gamma for 15 min before allergen stimulation. The concentration of LT in supernatants was measured according to the CAST-ELISA procedure. We stated that IFN-gamma had significantly diminished LT release in a dose-dependent mode from the leukocytes of pollinotics. IFN-gamma did not change LT release in the asthmatic group, although, in leukocytes the small and medium basic production of LT, IFN-gamma caused a statistically significant fall in LT generation.
2

The regulatory role of the autonomic innervation (adrenergic, cholinergic and nonadrenergic noncholinergic) in the airways functional status

100%
Liebhart J., Malolepszy J., Dor A.
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EN
There is noe recognized that the autonomic innervation of airways consist of classic adrenergic and cholinergic nerves as well as of a "third" - nonadrenergic noncholinergic (NANC)- nervous system.Taking into account its complex regulatory role can be crucial for better understanding of various phenomena attributable to bronchial asthma.
3

Histamine receptor expression on peripheral blood lymphocytes is influenced by specific and nonspecific activation

76%
Zak-Nejmark T., Kraus-Filarska M., Malolepszy J., Jankowska R., Jutel M., Nowak I. A., Nadobna G.
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vol. 48
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issue 2
107-110
EN
Histamine is a physiological mediator which exerts both effector and regulatory functions through its receptors on various cells. The aim of the study was to investigate changes in histamine receptor expression on peripheral blood lymphocytes affected by stimulation with both specific and nonspecific stimuli. Lymphocytes were obtained from both healthy and allergic subjects. Cells were incubated with various allergens (mixed grass pollen, Lolium perenne, Dermatophagoides pteronyssinus 1, bee venom, phospholipase A2) and nonspecific (fMLP, PMA/ionomycin, LPS) stimuli. The percentage of histamine-binding cells was determined with a fluorescence microscope after incubation with histamine-fluorescein. In control subjects histamine binding after stimulation with allergens was not significantly changed. In contrast, in allergic subjects stimulation with specific allergens resulted in significantly increased histamine binding. Nonspecific stimulation caused increased histamine binding to lymphocytes in both allergic subjects and healthy controls. We conclude that specific and nonspecific activation of lymphocytes is associated with increased expression of histamine receptors.
4

Comparison of leukocyte populations from bronchoalveolar lavage and induced sputum in evaluation of cell composition and nitric oxide production in patients with bronchial asthma

64%
Bienkowska-Haba M., Cembrzynska-Nowak M., Liebhart J., Dobek R., Liebhart E., Siemieniec I., Panaszek B., Obojski A., Malolepszy J.
Archivum Immunologiae et Therapiae Experimentalis
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2002
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vol. 50
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issue 1
75-83
EN
Bronchoalveolar lavage (BAL) or induced sputum (IS) techniques may provide leukocytes for the evaluation of airway inflammatory response in bronchial asthma. The aim of the present study was to compare features of leukocyte populations obtained by the two different methods regarding the cell types and their activity in patients with bronchial asthma. The nitric oxide (NO) level released from the cells was measured as a marker of their activity. Pulmonary leukocytes were obtained from the BAL and IS of 11 asthmatic patients in stable condition at the time of the study. The BAL and IS leukocyte populations varied in cell count and NO production. Macrophages were the predominant leukocyte population in BAL (Me = 83.0%, range 67.9-88.4%), whereas sputum sediments were found to consist mainly of neutrophils (Me = 55.7%, range 29.0-64.9%). The IS leukocytes released much more NO (p = 0.0022) than the BAL leukocytes. In spite of these quantitative differences, a similar pattern of NO production was observed in BAL and in IS cells. Both BAL and IS leukocyte populations produced almost the same amounts of NO before and after lipopolysaccharide stimulation (p = 0.9063, p = 0.4801, respectively). Furthermore, a slight positive correlation (RS = 0.5578, p=0.0594) was noticed between the neutrophil percentages and NO levels produced by BAL cells, whereas in IS a statistically significant correlation between the percentage of neutrophils and the levels of NO (RS = 0.6643, p = 0.0184) was observed. In conclusion, the BAL and IS leukocyte populations are different in cell type, their size and activity. Depending on the asthma severity and the type of cells needed in a study, either BAL or IS specimens may be chosen as a source of pulmonary leukocytes. The use of IS as a noninvasive technique is supposed to be potential value particularly in the study of the airway inflammatory response mediated mainly by neutrophils, i.e. during and/or after exacerbation of the disease. Based on our results, a possible contribution of neutrophils in the production of NO in the airways of asthmatic patients can be proposed apart from other cells such as macrophages.
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