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  • Granulocytes  (2)
  • Concanavalin A  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 278 (1986), S. 274-276 
    ISSN: 1432-069X
    Keywords: Interferon α2 ; Interferon γ ; Granulocytes ; Chemiluminescence ; Lucigenin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Interferon (IFN) has been described to influence various cellular functions. In this study we investigated whether the oxidative response of polymorphonuclear leukocytes (PMN) is also affected by IFN. In order to exclude the possible influence of impurities in IFN preparations, only recombinant human IFN α2 or γ were used. Lucigenin-dependent chemiluminescence (CL) of PMN was measured to assess the production of oxygen radicals. IFN γ at a concentration of more than 10 ng/ml elicited a minimal CL response in PMN. When PMN were incubated with IFN γ for 1 h and then stimulated with chemotactic peptide f-met-phe (FMP), zymosan-activated serum (ZAS), zymosan particles, or phorbol-myristate acetate (PMA), the CL response was increased as consequence of the generally enhanced oxidative metabolism. IFN α2 showed no such effect at any concentration tested. A 5-min pretreatment with IFN γ decreased the ZAS response but did not affect the reaction to the other stimuli. The possibility of a generation of IFN by PMN during the assay could be excluded as no IFN activity could be detected in an antiviral assay after stimulation of PMN for 6 h with PolyIxPolyC, LPS, ConA, C. parvum, PMA, zymosan, or FMP. The modulation of granulocyte activity by IFN γ may be important in the regulation of the anti-inflammatory response of PMN.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 278 (1985), S. 41-43 
    ISSN: 1432-069X
    Keywords: Complement ; Anaphylatoxins ; C5a ; Chemiluminescence ; Granulocytes ; Lucigenin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The complement system can be activated by many factors, including immune complexes, leading to the generation of biologically active split products like C5a anaphylatoxin. This study presents a technique which may be used for measuring C5a activity in human serum. The tetanus-anti-tetanus immune complex and aggregated human IgG were used as model activators of the complement cascade. The C5a activity was measured by C5a-induced chemiluminescence of granulocytes; furthermore, a radioimmunoassay was used to detect the C5a peptide. There was a strongly positive correlation between the two assay systems. The described method should be useful as an alternative means of detecting complement activation in the serum of patients with inflammatory diseases.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 262 (1978), S. 37-44 
    ISSN: 1432-069X
    Keywords: Atopic dermatitis ; Cell-mediated immunity ; T-lymphocytes ; Concanavalin A ; Neurodermitis atopica ; Zellvermittelte Immunität ; T-Lymphozyten ; Concanavalin A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Patienten mit Neurodermitis atopica leichten Schweregrades konnte im Rahmen einer kontrollierten Studie mit Hilfe von “matched pairs” eine gegenüber gesunden Kontrollpersonen signifikant (α=0,005) herabgesetzte in vitro 3H-Thymidin-Einbaurate in kultivierte Lymphozyten des peripheren Blutes, nach Stimulation mit dem T-Zellenmitogen Concanavalin A (Con A), festgestellt werden. Anhand von zehn differenten Konzentrationen von Con A wurden die Dosis-Wirkungsbeziehungen innerhalb der Paare bestimmt. Während höhere Con A-Konzentrationen in den Lymphozytenkulturen zu optimalen 3H-Thymidin-Einbauraten in neusynthetisierte DNS führten, waren die Unterschiede zwischen Neurodermitikern und Kontrollpersonen eindeutiger bei niedrigeren, suboptimalen Con A-Konzentrationen. Die spontane 3H-Thymidin-Einbaurate in kultivierte Lymphozyten ohne Con A-Stimulation (spontane DNS-Synthese) war bei Neurodermitikern im Vergleich zu Kontrollpersonen erhöht. Die Befunde weisen auf eine beeinträchtigte T-Zellenfunktion bei Neurodermitikern hin.
    Notes: Summary The Concanavalin A (Con A) stimulation response of peripheral lymphocytes in vitro was found to be decreased statistically significant (α=0.005) in patients with light atopic dermatitis, Strictly matched pairs were examined. Using ten graded concentrations of Con A, dose-response relations of the pairs were demonstrated, differences were more evident at lower suboptimal concentrations. Background DNA-synthesis of the patients was elevated.
    Type of Medium: Electronic Resource
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