The cellular basis the mechanism of specific hyposensitization is still unclear. We studied the effect of immunotherapy on activity of interleukin-8 (IL-8) and monocyte activating and chemoattractant protein (MCAF/MCP1) in bronchoalveolar lavage fluid (BALF). 20 patients with atopic asthma took part in this study. 14 were treated with grass pollen extracts (Allergovit, Allergopharma, Germany) for 7 weeks and 6 of this group were not treated and served as control group. ELISA test (R&D, USA) was used to assess IL-8 and MCAF/MCP1 activity in one ml of BALF recovered before and after immunotherapy. The results indicate that immunotherapy induces the suppression of MCAF/MCP1 production and the increase of IL-8 production in BALF. These chemokines may have reciprocal control on inflammatory cells, which participate in creating of inflammatory changes in asthma.