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The generation of antigen-specific, major histocompatibility complex-restricted cytotoxic T lymphocytes of the CD4+ phenotype. Enhancement by the cutaneous administration of interleukin 2.

Abstract

We have examined an in vitro system in which PBMC from purified protein derivative (PPD)-sensitized patients generate CTL after in vitro activation with antigen. These cells selectively destroy mycobacterial antigen PPD-pulsed monocyte targets. These CTL are of the CD4+ phenotype and exhibit MHC class II restriction. After exposure to antigen these cells require 5-7 d for maximal development, whereas, a separate antigen-independent population is generated within 3-4 d. CD8+ cells are poorly, if not at all, cytotoxic under similar conditions. Cells with properties of the NK and LAK lineage are also present in these cultures and kill other specific targets. Human rIL-2 was injected into the skin of lepromatous patients at 10-micrograms doses, given at 48-h intervals, for three doses. Peripheral blood cells obtained 8-14 d after the initiation of IL-2 injection demonstrated enhanced antigen-dependent destruction of monocyte targets. The efficacy of antigen-dependent and -independent populations and their amplification by IL-2-dependent mechanisms is discussed in terms of the local destruction of parasitized macrophages and the subsequent disposal of M. leprae.

More information

Type
Journal Article
Author
Hancock G E
Cohn Z A
Kaplan G
Year of Publication
1989
Journal
The Journal of experimental medicine
Volume
169
Issue
3
Number of Pages
909-19
Date Published
1989 Mar 01
Language
eng
ISSN Number
0022-1007
DOI
10.1084/jem.169.3.909
Alternate Journal
J. Exp. Med.
Publication Language
eng

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