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. 1990 Nov;71(3):428–433.

The lysis of cytotoxic T lymphocytes and their blasts by cytotoxic T lymphocytes.

B Schick 1, G Berke 1
PMCID: PMC1384444  PMID: 2269479

Abstract

After binding to their targets, cytotoxic T lymphocytes (CTL) deliver a lethal hit signal, ultimately leading to target cell lysis, and then can recycle to lyse additional targets, without themselves being destroyed. If non-specific secreted lytic mediators are involved in such lysis. CTL survival would not be expected unless the effectors are immune to CTL-mediated lysis. Therefore the lytic susceptibilities of alloimmune peritoneal exudate lymphocytes (PEL), containing up to 50% CTL, and of the cytolytic PEL blasts (PEB), obtained by culturing with interleukin-2 (IL-2), were examined. 51Cr-labelled BALB/c (H-2d) anti-EL4 (H-2b) (d alpha b) PEL were lysed 88%, 78%, and 48% by C3H/eb (H-2k) anti-P815 (H-2d) (k alpha d) PEL, C57BL/6 (H-2b) anti-P815 (b alpha d) PEL and b alpha d PEB, respectively. Similarly, b alpha d PEL were lysed 82% and 21% by d alpha b PEL and PEB, respectively. b alpha d PEB were lysed 82%, 28-39% and 39-51% by k alpha d PEL, b alpha d PEL and b alpha d PEB, respectively, b alpha d PEB were lysed 29-55% by d alpha b PEL. Furthermore, the CTL-containing populations were no less susceptible to lysis than normal lymphocytes. Since the majority (80-90%) of cells in these two types of CTL-containing populations can be directly and specifically lysed by appropriately immunized PEL CTL, we conclude that both the lytic granule and perforin lacking (PEL) and containing (PEB) CTL are not a priori immune to CTL-mediated lysis. These findings are in accord with theories proposing lysis to be induced by receptor-mediated contact between effector CTL and target cells, and challenge those suggesting the involvement of secreted lytic mediators.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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