Tehran University of Medical Sciences Iranian Journal of Allergy, Asthma and Immunology 1735-1502 1 2 2000 04 15 69 71 Alireza Uungbur Antonio Pizzulli   Mohammad Javad Marashi   Kiumars Ilaji Nouri Mansour Kahmani 2015 10 01 Interleukin-4 (IL-4) is produced by T-helper cells type 2 (TH2) and induces IgE synthesis. T-helper cells type 1 (TH1) produce interferon-gamma (IFN-gamma) which suppresses TH2 and reduces IL-4 induced IgE production. In this :;tudy , we demonstrated that the levels of specific IgE in the serum of atopic children (n=20) were elevated while IL-4 production was increased and IFN-gamma secretion was reduced, compared to those of control group. Inter!eukin-4-induced IgE synthesis by peripheral blood mononuclear cells of atopic children in vitro was blocked in the presence of IFN-gamma. In addition, levels of soluble CD23-which is specifically induced by IL-4 were significantly elevated in our atopic patients. The data indicate that enhanced production of IL-4 and lowered IFN-gamma secretion by T-helper cells correlate with the elevated specific IgE levels in the serum of atopic children. https://ijaai.tums.ac.ir/index.php/ijaai/article/view/12 https://ijaai.tums.ac.ir/index.php/ijaai/article/download/12/12