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Oncoimmunology. 2015 Nov 3;5(3):e1102829. eCollection 2016 Mar.

IL-2/anti-IL-2 mAb immunocomplexes: A renascence of IL-2 in cancer immunotherapy?

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1
Laboratory of Tumor Immunology, Institute of Microbiology, Academy of Sciences of the Czech Republic , Prague, Czech Republic.

Abstract

The in vivo biological activity of IL-2 can be dramatically increased by complexing with anti-IL-2 mAb. Moreover, IL-2/anti-IL-2 mAb immunocomplexes selectively stimulate different subsets of immune cells, depending on the clone of anti-IL-2 mAb that is used. Thus, IL-2/S4B6 mAb complexes strongly stimulate CD122high populations, namely NK and memory CD8+ T cells. They also intermediately stimulate Treg cells. Conversely, IL-2/JES6.1 mAb immunocomplexes have no stimulatory activity for CD122high populations. However, they potently and highly selectively stimulate CD25+ cells (i.e., Treg and activated T cells). IL-2/S4B6 mAb immunocomplexes have also been shown to possess antitumor activity in various mouse tumor models.

KEYWORDS:

Anti-IL-2 mAb; IL-2; cancer immunotherapy; immunocomplexes; selective stimulatory activity

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