Immunomodulation by iscoms, immune stimulating complexes

doi:10.1006/meth.1999.0833

1999-09-01

PRE

Brør Morein *

Karin Lövgren Bengtsson

DOI：10.1006/meth.1999.0833

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摘要

En 中文

The iscom is a uniform stable complex consisting of cholesterol, phospholipid, adjuvant-active saponin, and antigen. The iscom matrix is a particulate complex with identical composition, shape, and morphology but lacking the incorporated antigen. The assembly of the complex is based on hydrophobic interactions, but antigens that are not hydrophobic can be conjugated with a hydrophobic tail or hidden hydrophobic regions can be exposed, e.g., by acid treatment, to facilitate the incorporation into iscoms. The functional aspects of iscoms are described emphasizing immunomodulation in mouse models. Iscoms prominently enhance the antigen targeting uptake, and activity of antigen presenting cells including dendritic and B cells and macrophages resulting in the production of proinflammatory cytokines, above all interleukin (IL)-1, IL-6, and IL-12. The expression of costimulatory molecules major histocompatibility complex (MHC) class II, B7.1. and B7.2, is also enhanced. The latter partly explains why the iscom is an efficient adjuvant for elderly mice. Iscoms enhance the Th1 type of response with increased production of IL-2 and interferon g. However, with some antigens and particularly in monkeys immunized with HIV iscoms, the production of IL-4 was enhanced. IL-4, IL-2, and interferon g (IFNg) together with the b chemokines MIP-1a and MIP-1b correlated with protection against challenge infection with a chimeric virus (simian immunodeficiency virus-human immunodeficiency virus). Iscoms were also shown to induce a potent immune response in the newborn and to be an efficient delivery system for mucosal administration. Technical information is given about formulation of iscoms and about handling of antigens to optimize their incorporation into iscoms. (C) 1999 Academic Press.

Keyword:

VIRUS-NEUTRALIZING ANTIBODIES

T-CELL RESPONSES

IMMUNOSTIMULATING COMPLEXES

DENDRITIC CELLS

B-CELLS

SYNTHETIC PEPTIDES

INTERFERON-GAMMA

IN-VITRO

ANTIGEN PRESENTATION

VACCINE PROTECTION