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Statins are widely used hypocholesterolemic drugs that inhibit 3-hydroxy-3-methyl-glutaryl-coenzyme A reductase, a rate-limiting enzyme of the mevalonate pathway whose biosynthetic endproduct is cholesterol. As a result of this activity, statins may perturb the composition of cell membranes, resulting in lipid raft disruption. Furthermore, by inhibiting protein prenylation, a process also dependent on mevalonate, statins block membrane targeting and activity of small GTPases. Antigen uptake, processing and presentation involve the interplay of Rab and Rho family GTPases. Furthermore, lipid rafts have been implicated both in antigen internalization by the BCR and in MHC class II clustering at the immunological synapse. Here we have addressed the effects of simvastatin on antigen processing and presentation by human B cells and dendritic cells. The results show that simvastatin potently suppresses tetanus toxoid processing and presentation to CD4+ T cells by HLA-DR by inhibiting protein antigen uptake through both receptor-mediated endocytosis and macropinocytosis. This effect can be largely accounted for by defective prenylation of Rho and Rab GTPases in the absence of any measurable perturbation of lipid rafts. In addition, simvastatin was found to preferentially affect the invariant chain-dependent MHC class II pathway, thereby identifying this route of antigen processing and presentation as a selective target of statins.

Original publication

DOI

10.1002/eji.200636567

Type

Journal article

Journal

Eur J Immunol

Publication Date

11/2006

Volume

36

Pages

2885 - 2893

Keywords

Anticholesteremic Agents, Antigen Presentation, B-Lymphocytes, CD4-Positive T-Lymphocytes, Cells, Cultured, Dendritic Cells, Genes, MHC Class II, Histocompatibility Antigens Class II, Humans, Protein Prenylation, Simvastatin, Tetanus Toxoid, ras Proteins