Abstract:
:Many factors induce or enhance expression of major histocompatibility complex class I and class II molecules on various cell types. Human T lymphocytes are class II negative in the resting state but show expression of class II molecules following activation. We analyzed the modulating capacity of the lymphokines recombinant interferon gamma (rIFN-gamma), interleukin-4 (IL-4), and recombinant tumor necrosis factor alpha (rTNF-alpha) on class II expression in subsets of alloactivated human T lymphocytes. The activated CD4+ T cells expressed all three class II isotypes (DR, DQ, and DP), whereas the cytotoxic CD8+ T-cell lines expressed DR and DP molecules but failed to bind DQ-specific monoclonal antibodies significantly. Treatment with rIFN-gamma and IL-4 had no effect on class II expression on any of the T-cell lines or clones, whereas rTNF-alpha enhanced class II expression in both subsets. rTNF-alpha could modulate expression of all three class II isotypes but, in principle, it appears only to affect ongoing class II synthesis as de novo synthesis of class II molecules with a resultant change in the class II phenotype from DR+ DQ- DP+ to DR+ DQ+ DP+ in the CD8+ T lymphocytes was not observed. No synergic effects of rINF-gamma and rTNF-alpha were observed; this results from the fact that activated T cells express few, if any, receptors of rIFN-gamma.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Diedrichs-Möhring M,Epplen JT,Schendel DJdoi
10.1016/0198-8859(91)90101-esubject
Has Abstractpub_date
1991-08-01 00:00:00pages
286-92issue
4eissn
0198-8859issn
1879-1166pii
0198-8859(91)90101-Ejournal_volume
31pub_type
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