Abstract:
:In this report we investigated the production and role of interleukin (IL)2 and IL4 in the generation of antigen-specific cytotoxic T cells (CTL). We used as our model the ultraviolet-light-induced epithelial tumor 1591, a highly immunogenic regressor tumor which evokes a strong cell-mediated immune response leading to rejection. We show that IL2 and IL4 are differentially required for the development of optimal cytolytic activity to the 1591 tumor in primary and secondary in vitro splenic cultures. First, anti-IL2 receptor monoclonal antibody (mAb) significantly decreased specific cytotoxicity in both primary and secondary splenic mixed lymphocyte-tumor cell culture (MLTC) cultures, but anti-IL4 mAb inhibited the cytotoxic responses only secondary and not primary cultures. Second, when supernatants from MLTC were tested for lymphokine activity, primary cultures produced only IL2 while secondary cultures produced both IL2 and IL4. Splenic cells were then depleted of CD4+ cells by negative selection, or enriched for CD8+ cells by positive selection, and tested for lymphokine production and requirements. CD8+ cells could not generate significant CTL activity in primary cultures, but could in secondary MLTC. The addition of mAb to either IL2 or IL4 significantly inhibited the generation of CTL by CD8+ cells in these secondary MLTC.CD8+ cells were also found to produce both IL2 and IL4 in secondary MLTC by functional and Northern blot analysis. The production of IL2 and IL4 by CD8+ cells occurs during different phases of culture, with IL2 being produced early (days 1 and 2) and IL4 late (days 3-5). In addition, the requirement of CD8+ cells for both IL2 and IL4 is unique for that lymphokine. These results suggest that both IL2 and IL4 are both produced and required by CD8+ cells during secondary MLTC, and suggest an additional cellular source of IL4 production besides CD4+ T cells during antigen-specific CTL responses.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Horvat B,Loukides JA,Anandan L,Brewer E,Flood PMdoi
10.1002/eji.1830210813subject
Has Abstractpub_date
1991-08-01 00:00:00pages
1863-71issue
8eissn
0014-2980issn
1521-4141journal_volume
21pub_type
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journal_title:European journal of immunology
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