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  • 1
    Digitale Medien
    Digitale Medien
    IgG2 Deficiency Associated with Defects in Production of Interferon-Gamma; Comparison with Common Variable Immunodeficiency (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 41 (1995), S. 0 
    Details
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We report a novel mechanism of IgG2 deficiency. Several investigators have reported patients with IgG subclass deficiencies due to homozygous deletion of immunoglobulin heavy chain constant region genes. However, it is unclear what mechanism is responsible for IgG subclass deficiency in cases where no gene deletions have been detected and which are accompanied by recurrent infections due to aberrant immunoregulation. In the present study, we have focused our attention on production by peripheral blood mononuclear cells (PBMCs) of interferon-gamma (IFN-γ), which is known to induce IgG2 expression. PBMCs from four patients with IgG2 deficiency and their families were studied. Mitogen-induced IFN-γ production by PBMCs was decreased in all of the patients, although the proliferative responses of PBMCs and the percentages of CD3, CD4, and CD8 T cell subsets were not decreased. IgG2 production by PBMCs was restored upon addition of IFN-γ and mitogen to the PBMCs of the patients with IgG2 deficiency though it was not restored in the patients with common variable immunodeficiency. We conclude that defects in production of IFN-γ play an important role in IgG2 deficiency.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3083.1995.tb03544.x
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  • 2
    Digitale Medien
    Digitale Medien
    Identification of monocyte chemotactic factors in supernatants of ovalbumin-stimulated lymphocytes from patients with atopic dermatitis who are sensitive to hen's egg (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 24 (1994), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Monocyte chemotactic activities in supernatants of ovalbumin (OA)-stimulated peripheral blood mononuclear cell (PBMC) cultures were studied in patients with atopic dermatitis (AD) who were sensitive to hen's egg. The monocyte chemotactic activities in hen's egg-sensitive AD patients were significantly higher than those of non-atopic healthy controls and patients with immediate allergic symptoms. However, the monocyte chemotactic activities were not detected in bovine serum albumin-Stimulated PBMC culture supernatants in patients with AD who were sensitive to hen's egg. but not to cow's milk. Furthermore, there was significant correlation between the monocyte chemotactic activities and proliferative responses of PBMCs to OA in hen's egg-sensitive AD patients, whereas there was no significant correlation between the monocyte chemotactic activities and radioallergosorbent test values. These results suggest that PBMCs stimulated with food antigens produce monocyte chemotactic factors which relate to the pathogenesis of AD in food-sensitive AD patients and that the pathogdenesis of AD may be related to cell-mediated immune responses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1994.tb00247.x
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  • 3
    Digitale Medien
    Digitale Medien
    Suppressive effects of elimination diets on T cell responses to ovalbumin in hen's egg-sensitive atopic dermatitis patients (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 23 (1993), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We investigated the effect of elimination diets on T cell responses to ovalbumin (OA) in hen's egg-sensitive atopic dermatitis (AD) patients. The proliferative responses of both peripheral blood mononuclear cells (PBMCs) and T cells with monocytes to OA decreased after elimination diets, but those to Candida albicans or phytohemagglutinin (PHA) did not decrease after elimination diets. The proliferative responses of CD4+ T cells with monocytes to OA decreased after elimination diets. In these patients, clinical symptoms of AD improved. These results indicate that T cells, especially CD4+ T cells, respond to food antigens in food-specific lymphocyte responses, and that elimination diets may be able to initiate reduction of the responsiveness of food-sensitive T cells, especially CD4+ T cells. Moreover, the surface marker phenotypes of the T cells responding to OA were analysed. Our results showed that CD4+CD45RA+ T cells tended to increase. The increase in circulating CD4+CD45RA+ T cells might function as systemic suppression against immune responses in the skin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1993.tb01795.x
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  • 4
    Digitale Medien
    Digitale Medien
    Inhibition of proliferative responses of lymphocytes to food antigens by an anti-allergic drug, N(3′,4′-dimethoxycinnamoyl) anthranilic acid (Tranilast) in children with atopic dermatitis (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 22 (1992), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Experimental studies have shown that N(3′, 4′-dimethoxycinnamoyl) anthranilic acid (Tranilast) inhibits reaginic antibody-mediated hypersensitivity reactions, and it has been demonstrated to be an effective drug for patients with bronchial asthma. On the other hand, from the nature of the cellular infiltrate seen in eczematous lesions, it appears that some form of cell-mediated immunity may be involved in addition to IgE-mediated immunity in the pathogenesis of atopic dermatitis (AD). Moreover, we have previously reported that the proliferative responses of peripheral blood mononuclear cells (PBMCs) to ovalbumin (OA) or bovine serum albumin (BSA) in children with AD who are sensitive to hen's egg or cow's milk were significantly higher than those of healthy children and hen's egg or cow's milk sensitive children with immediate symptoms.In this study, we have showed that the proliferative responses of PBMCs to OA were dose-dependently inhibited by Tranilast on patients with AD. The responding cells to OA were shown, through separation experiments, to be T cells, and the proliferative responses of T cells to OA were also dose-dependently inhibited by Tranilast. Moreover, the inhibition was thought to occur at the initial stage of the proliferative reactions. These results suggest that Tranilast can be clinically applied to patients with AD.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1992.tb00146.x
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  • 5
    Digitale Medien
    Digitale Medien
    Improvement of food-sensitive atopic dermatitis accompanied by reduced lymphocyte responses to food antigen following natural measles virus infection (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 23 (1993), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Five patients with atopic dermatitis (AD) who were sensitive to hen's egg were observed before and after natural measles virus infection. Within 4 weeks of natural measles virus infection, the eczematous lesions clearly improved in four of the five patients in whom neither offending foods were eliminated, nor anti-allergic drugs, systemic steroids and steroid ointment administered. This was accompanied by reduced proliferative responses of peripheral blood mononuclear cells (PBMCs) to ovalbumin (OA). Another patient showed a transient improvement of AD symptoms, from severe to mild, and thereafter returned to severe accompanied by increased proliferative responses of PBMCs to OA. Radioallergosorbent test (RAST) scores for hen's egg in all five patients did not change in each level in each patient, except the transiently decreased RAST scores for hen's egg in one patient, after the infection. Thus, in patients with AD who are sensitive to food, the improvement of AD symptoms that appeared within 4 weeks of natural measles virus infection was related to reduced proliferative responses of PBMCs to the food antigen following the infection.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1993.tb02483.x
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  • 6
    Digitale Medien
    Digitale Medien
    The effect of ONO-3705, a novel TxA"2 receptor antagonist, on U-46619-induced contraction of guinea pig and human tracheal strips in vitro and on bronchoconstriction in guinea pigs in vivo
    Amsterdam : Elsevier
    Prostaglandins 41 (1991), S. 375-382 
    Details
    ISSN: 0090-6980
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0090-6980(91)90006-2
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  • 7
    Digitale Medien
    Digitale Medien
    METHYLATION PATTERNS OF I ε REGION IN B CELLS STIMULATED WITH INTERLEUKIN 4 AND EPSTEIN-BARR VIRUS IN PATIENTS WITH A HIGH LEVEL OF SERUM IgE (1995)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 22 (1995), S. 0 
    Details
    ISSN: 1744-313X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: Human IgE synthesis requires the presence of both interleukin 4 (IL-4) and T-cells. However, it is not clear what role IL-4 and T-cells play in the induction of IgE synthesis at the level of gene regulation. B cells that were obtained from patients with a high level of serum IgE and from healthy donors were immortalized by Epstein-Barr virus. We examined IgE production of these B cells stimulated with IL-4. Supernatant IgE levels of patient's B cells cultured with or without IL-4 were higher than those of healthy donor's B cells. Our results indicated that B cells stimulated with IL-4 from patients produced IgE, germline C ε transcript, and S μ S ε recombination. The germline C e transcript was dose-dependently induced in the presence of IL-4 and related to the supernatant IgE level. In B cells stimulated with IL-4 that were obtained from patients, (some of the) DNA near or within the I e region was (already partly) unmethylated, unlike those from healthy donors, and there was a loss of methyl groups of the DNA upon the addition of IL-4 in B cells from both patients and normal donors. IgE synthesis of B cells stimulated with IL-4 in patients with a high level of serum IgE is due to an accessibility in the immunoglobulin heavy-chain isotype switch, and this may reflect the accessibility in synthesis of germline C ε transcript, which may be caused by the increase of opening chromatin structures because of their unmethylation in the I ε region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1744-313X.1995.tb00241.x
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