Related Experiment Video
Updated: May 13, 2026
09:51
Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
Published on: July 26, 2017
Aldara activates TLR7-independent immune defence
Anne Walter1, Matthias Schäfer, Virginia Cecconi
1Department of Oncology, University Hospital Zurich, Wagistrasse 14, 8952 Schlieren, Switzerland.
Nature Communications
|March 7, 2013
Summary
Aldara cream
Area of Science:
- Immunology
- Dermatology
- Pharmacology
Background:
- Aldara (imiquimod) is a topical cream for non-melanoma skin cancer.
- Imiquimod stimulates toll-like receptor 7 and anti-tumor immunity.
- Aldara is used as a mouse model for psoriasis induction.
Purpose of the Study:
- To investigate the immune pathways activated by Aldara in naive murine skin.
- To determine the role of toll-like receptor 7 in Aldara-induced inflammation.
- To identify components of Aldara responsible for its effects on skin.
Main Methods:
- Application of Aldara and its vehicle to murine skin.
- Analysis of inflammatory markers, keratinocyte death, and cytokine release.
- In vitro studies using cultured keratinocytes and isostearic acid.
Main Results:
- Aldara induces inflammation largely independent of toll-like receptor 7.
- The vehicle cream alone triggers inflammasome activation, keratinocyte death, and IL-1 release.
- Isostearic acid in the vehicle activates inflammasomes in keratinocytes.
Conclusions:
- Aldara activates at least two independent immune pathways.
- Both imiquimod and the vehicle are necessary for a complete inflammatory response.
- Imiquimod-independent effects of the vehicle may contribute to Aldara's therapeutic efficacy.
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