Related Experiment Video
Updated: Aug 17, 2026
Differential Effects of Lipid-lowering Drugs in Modulating Morphology of Cholesterol Particles
Published on: November 10, 2017
Statins as immunomodulators
1Department of Medicine, University Hospital Geneva, Foundation for Medical Research, Switzerland. machf@cmu.unige.ch
Insights
Statins, commonly used to lower cholesterol, were found to inhibit the immune response by blocking major histocompatibility complex class II (MHC-II) expression. This discovery reveals statins as novel immunomodulators with potential applications beyond cardiovascular health.
Area of Science:
- Immunology
- Pharmacology
- Molecular Biology
Background:
- HMG-CoA reductase inhibitors (statins) are widely used lipid-lowering drugs.
- Statins' role in immune response was previously unestablished, despite some clinical observations suggesting benefits in organ transplantation.
- Major histocompatibility complex class II (MHC-II) molecules are crucial for T lymphocyte activation and immune response control.
Purpose of the Study:
- To investigate the potential immunomodulatory effects of statins.
- To determine if statins influence the expression of MHC-II molecules.
- To explore the implications of statins' effects on T cell activation.
Main Methods:
- Investigated the effect of statins on the induction of MHC-II expression by interferon gamma (IFN-gamma).
- Utilized primary human endothelial cells and macrophages for experimental models.
- Examined the specificity of statin effects on inducible MHC-II versus constitutive MHC-II and MHC-I expression.
Main Results:
- Statins were demonstrated to be direct inhibitors of IFN-gamma-induced MHC-II expression.
- This inhibitory effect was observed in multiple cell types, including endothelial cells and macrophages.
- The inhibition was specific to inducible MHC-II expression, not affecting constitutive MHC-II or MHC-I expression.
Conclusions:
- Statins act as novel immunomodulators by repressing the induction of MHC-II.
- This mechanism provides a scientific basis for statins' potential use as immunosuppressors.
- Statins may be beneficial in organ transplantation and other immune-related pathologies.
Abstract:
HMG-CoA reductase inhibitors, or statins, are effective lipid lowering agents, extensively used in medical practice. Statins have never been shown to be involved in the immune response, although few clinical reports have suggested a better outcome of cardiac transplantation in patients under pravastatin therapy. Major histocompatibility complex class II (MHC-II) molecules are directly involved in the activation of T lymphocytes and in the control of the immune response. Whereas only a limited number of specialized cell types express MHC-II constitutively, numerous other cells become MHC-II positive upon induction by interferon gamma (IFN-gamma). We and others recently demonstrated that statins act as direct inhibitors of induction of MHC-II expression by IFN-gamma and thus as repressors of MHC-II-mediated T cell activation. This effect was observed in several cell types, including primary human endothelial cells and macrophages. Interestingly, this inhibition is specific for inducible MHC-II expression and does not concern either constitutive expression of MHC-II or expression of MHC-I. In repressing induction of MHC-II, and subsequent T lymphocyte activation, statins therefore behave as a novel type of immunomodulator. This unexpected effect provides a scientific rationale for suggesting the use of statins as novel immunosuppressors, not only in organ transplantation but in numerous other pathologies as well.
Related Concept Videos
01:20Lipid-Lowering Drugs: Statins and Miscellaneous Agents
01:19Antiasthma Drugs: Leukotriene Modifiers
Leukotriene modifiers work through two distinct mechanisms:
01:25Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
01:29Drugs for Treatment of Crohn's Disease in IBD Using Immunomodulatory Agents
01:29Pharmacogenomics: Identification of New Drug Targets
01:30Inhibitors of Viral Protein Synthesis