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Macrophage activation for the production of immunostimulatory cytokines by delivering interleukin 1 via biodegradable microspheres.

Abstract：

:Interleukin 1alpha (IL-1alpha), a pleiotropic cytokine with multiple anti-tumour activities, has been investigated in our laboratory for its potential to serve as an immunotherapeutic agent. In the present study, an attempt was made to direct IL-1alpha to macrophages, in order to induce their immunoregulatory activities. For that purpose, IL-1alpha was encapsulated within biodegradable poly(lactic/glycolic acid) microspheres, 1-5 microm diameter in size. The microspheres were efficiently taken-up by macrophages in culture and after intraperitoneal injection into mice. In culture, phagocytosis of the microspheres reached saturation within 3 h and there was no apparent effect of polymer type on the extent of uptake. In vivo uptake of human IL-1alpha-microspheres by the macrophages lead to cell activation, as evidenced by the enhanced production of murine IL-1alpha, IL-6 and IL-12. Control microspheres, containing bovine serum albumin, induced only background to low levels of cytokine production. These cytokines, when expressed by or secreted from macrophages, may stimulate in situ diverse immune and inflammatory responses, including T cell-mediated immune responses, such as the development of Th(1)cells and cytotoxic lymphocytes. Thus, directing IL-1alpha into macrophages, via the appropriate microspheres, may serve as a unique mean to activate these cells to participate in anti-tumour immune responses in situ.

journal_name

Cytokine

journal_title

Cytokine

authors

Mullerad J,Cohen S,Voronov E,Apte RN

doi

10.1006/cyto.2000.0775

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

1683-90

issue

11

eissn

1043-4666

issn

1096-0023

pii

S1043-4666(00)90775-0

journal_volume

12

pub_type

杂志文章

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