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Helper interleukins are produced by both CD4 and CD8 splenic T cells after mitogen stimulation.

Abstract：

:We have earlier described (Cardell, S. and Sander, B., Eur. J. Immunol. 1990. 20:389) mitogen-induced production of interleukin (IL)2, IL4 and IL5 mRNA by murine spleen cells, analyzed by in situ hybridization. In the present study we have investigated the potential of CD8 T cells to produce these interleukins, normally associated with the helper function of CD4 T cells. When concanavalin A (Con A)-activated spleen cells were restimulated with Con A and phorbol 12-myristate 13-acetate (PMA), higher levels of IL2, IL4 and IL5 mRNA were induced, as detected both by increased frequencies of positive cells, and by more mRNA per cell. Four-to-six-day Con A blasts were enriched for CD4+ or CD8+ T cells, and restimulated with Con A and PMA. Both CD4 and CD8 cells were found to produce all three kinds of mRNA when restimulated. The frequencies of IL2 mRNA-containing CD8 cells were half of those found for CD4 cells (3.5% as compared to 7%). On the average 1% of the CD8 cells were induced to produce IL4 and IL5 mRNA, while 9% and 3% of the activated CD4 cells contained IL4 and IL5 mRNA, respectively. CD4 and CD8 cells displayed different sensitivities to the reagents when tested alone. Con A induced the synthesis of IL4 and IL5 in CD4 cells, but not CD8 cells, independently of PMA. PMA alone induced extensive thymidine incorporation in CD8 cells, but not in CD4 cells, in the absence of detectable lymphokine mRNA. The results suggest that some CD8 cells have the capacity to give help in immune responses, by secretion of IL2, IL4 and IL5.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Cardell S,Sander B,Möller G

doi

10.1002/eji.1830211028

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

2495-500

issue

10

eissn

0014-2980

issn

1521-4141

journal_volume

21

pub_type

杂志文章

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