Abstract：
:In the present study, we explored the specific requirements for lysis of human activated T cells by CD4+ CTLs. This was achieved by using human CD4+ T cell lines or clones specific for a peptidic fragment of influenza virus as both CTL effectors and target T cells (TTCs). Our results further establish that human activated T cells expressing HLA-DR molecules can present Ag to and be lysed by CD4+ HLA-DR restricted CTLs. This killing is Ag specific and HLA-DR restricted. It can be observed whether TTCs are heterologous or autologous, CD4+ or CD8+. However, we find that in our model: (a) TTCs are able to present artificially processed peptidic fragments of Ag, but not the corresponding natural Ag in the context of class II determinants, even if they can process whole virus in the context of class I determinants; (b) TTCs must express high density of HLA-DR molecules on their membrane; (c) preincubation of TTCs with high concentrations of peptide is required; and (d) interestingly enough, addition of free peptide at similar concentration during the cytolytic assay to replace TTC preincubation inhibits TTC lysis by at least two different mechanisms, i.e., cold-target inhibition in which CTLs serve as their own cold targets and inhibition at the effector cell level. From these results, one can conclude that stringent conditions are required for lysis of activated T cells by class-II-restricted CTLs.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Eljaafari A,Dorval I,Zeliszewski D,Le Gac S,Sterkers Gdoi
10.1016/0198-8859(92)90094-4subject
Has Abstractpub_date
1992-09-01 00:00:00pages
50-9issue
1eissn
0198-8859issn
1879-1166pii
0198-8859(92)90094-4journal_volume
35pub_type
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