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The Journal of Immunology, Vol 150, Issue 9 3793-3805, Copyright © 1993 by American Association of Immunologists

ARTICLES

Cytolytic activity of murine CD4+ T cell clones correlates with IFN- gamma production in mouse strains having a BALB/c background

MD McKisic, DW Lancki and FW Fitch
Committee on Immunology, University of Chicago, IL 60637.

CD4+ murine T cell clones were derived from various strains of mice, and their pattern of lymphokine secretion and cytolytic activity was compared. Limiting dilution cultures were established with lymph node cells from mice sensitized with OVA. Alloreactive CD4+ T cell clones also were derived in limiting dilution cultures prepared with naive BALB/c-H-2dm2 lymph node cells stimulated with irradiated BALB/c splenocytes. A total of 24 days elapsed between establishment of cultures and analysis of lymphokine production and cytolytic activity. Cytolytic capacity was assessed by using target cells that had been pulsed with Ag or coated with anti-CD3 mAb. We observed that: 1) the frequency of OVA-reactive T cells from various mouse strains was approximately the same; 2) both Th1 and Th2 cells as well as cells not encompassed within these categories could be lytic if derived from DBA/2, B10.D2, B10.A, C57BL/10, or C57BL/6 mice; and 3) the vast majority of CD4+ cloned T cells derived from BALB/c, BALB/c-H-2dm2, BALB.B, or BALB.K that did not produce IFN-gamma (including Th2 cells) did not exhibit cytolytic activity, whereas most clones derived from these strains that produced IFN-gamma were cytolytic. These observations indicate that both Th1 and Th2 cells from several mouse strains express cytolytic activity. Such cytolytic activity was not restricted to clones maintained in long term cultures. However, genes outside the MHC appeared to regulate the cytolytic activity of T cells. In particular, CD4+ T cell clones which did not produce IFN-gamma were not cytolytic when they were derived from BALB/c mice and mutant or MHC congenic inbred mice having a BALB background. Cytolytic activity of CD4+ T cells, in addition to the pattern of lymphokine production, may be important in graft rejection and in immune responses to infectious diseases.


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