Aug 15, 1995

Analysis of the CD4 coreceptor and activation-induced costimulatory molecules in antigen-mediated mature T lymphocyte death

The Journal of Immunology : Official Journal of the American Association of Immunologists
S A BoehmeM J Lenardo


We have compared the signaling requirements for activation and lymphokine production in mature T lymphocytes to those required for TCR-driven programmed cell death (PCD). Both processes require TCR engagement and ligation of the CD4 coreceptor in the case of a T cell clone that recognizes Ag in the context of an MHC class II molecule. By contrast, stimulation through the CD28/B7 pathway does not appear to positively or negatively influence TCR-induced PCD, although it was required for IL-2 production in both resting and proliferating T cells. T cells that had been activated and induced to proliferate with IL-2 were found to express high levels of IL-2 mRNA upon TCR rechallenge, without a requirement for accessory cells. This was due to a strong up-regulation of the B7-1 molecule, but not the B7-2 molecule, on the T cell surface. These T cells that strongly costimulate each other are highly susceptible to TCR-induced death providing independent evidence that costimulatory signals are not protective. Thus, these results provide evidence that in mature T cells there exists a difference in the requirement for CD28 to achieve activation and IL-2 production compared with TCR-mediated PCD.

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Mentioned in this Paper

CD80 Antigens
Monoclonal Antibodies
Biochemical Pathway
CD86 gene
CD4 Antigens
Apoptosis, Intrinsic Pathway
Leukocyte Differentiation Antigens, Human
Mice, Inbred BALB C
CD80 gene

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Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis