Abstract:
:A long-term CD4-CD8- TCR alpha beta human T-cell line, as well as similar CD4-CD8- TCR gamma delta T-cell lines for comparison, were generated from various tissues by negative selection using anti-CD4 and anti-CD8 monoclonal antibodies (MAbs) followed by positive selection with specific anti-TCR MAb and then repeated in vitro stimulation with interleukin-enriched media and lectin. These cell lines all demonstrated non-MHC-restricted cytolysis on a variety of human tumor cell lines. However, removal of lymphokines from the culture media for 24 hr abrogated most of the non-MHC-restricted target-cell lysis without affecting TCR alpha beta or TCR gamma delta cell viability or TCR function as determined by antibody-triggered redirected target-cell lysis. Subsequent re-exposure to lymphokines reconstituted non-MHC-restricted cytolysis by these cell lines. Thus, much of the non-specific, non-MHC-restricted cytolytic activity generated by CD4-CD8- TCR alpha beta or TCR gamma delta cells is secondary to lymphokine-activated killing (LAK) activity. These cells have potent LAK activity and may be prominent in LAK-cell populations. In addition, after lymphokine deprivation, both CD4-CD8- TCR alpha beta and TCR gamma delta cells showed residual activity against some tumor-cell targets, the nature of which remains to be defined.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Maziarz RT,Groh V,Prendergast M,Fabbi M,Strominger JL,Burakoff SJsubject
Has Abstractpub_date
1991-04-22 00:00:00pages
142-7issue
1eissn
0020-7136issn
1097-0215journal_volume
48pub_type
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