Inhibition of murine cytotoxic T cell responses by progesterone

Daniela N. Mannel, Werner Falk, Ilana Yron*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


In the present study we evaluated the effect of sex hormone on the generation of murine cytotoxic T cell responses. We show that the in vitro CTL response was strongly inhibited by progesterone but not by E1, E2 or testosterone. Our experiments attempting to understand the mechanism of the hormone action on CTL development have revealed that the ability of the cells to generate helper signals was not affected. This was demonstrated by the fact that neither IL-2 production nor IL-2 receptor expression was altered by the hormone. Rather, it appears that the capacity of the cells to respond to the signals and to become cytotoxic was modified. Furthermore, we show that the hormone mediated an inhibition of CTL development in thymocyte cultures externally supplemented with all the required helper factors. These results strongly suggest that progesterone has a direct effect on the differentiation of cytotoxic effector cells.

Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalImmunology Letters
Issue number1
StatePublished - Oct 1990


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