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Epidermal cytokines in murine lupus
1Department of Medicine, University of Toronto, Ontario, Canada.
The Journal of Investigative Dermatology
|January 1, 1993
Summary
Ultraviolet (UV) radiation worsens lupus in NZB mice by increasing skin production of interleukin-1 (IL-1). This cytokine exacerbates lupus, highlighting a key mechanism in UV-induced disease flares.
Area of Science:
- Immunology
- Dermatology
- Autoimmune Diseases
Background:
- Systemic lupus erythematosus (SLE) and murine lupus are autoimmune diseases marked by autoantibodies.
- New Zealand black (NZB) mice are a model for lupus, with anti-DNA antibodies indicating disease presence.
- Ultraviolet (UV) radiation exacerbates both human and murine lupus, potentially via cytokine induction.
Purpose of the Study:
- To investigate the role of UV-induced cytokines, specifically interleukin-1 (IL-1), in exacerbating lupus in NZB mice.
- To determine if cutaneous IL-1 production mediates UV-induced lupus flares.
Main Methods:
- NZB and DBA/2 mice were exposed to UV irradiation.
- Sera and spleen cell cultures were analyzed for anti-DNA antibodies.
- Skin biopsies were assessed for IL-1 alpha mRNA and bioactivity before and after UV exposure.
Main Results:
- UV-exposed NZB mice showed a significant increase in anti-DNA antibodies.
- NZB mice exhibited a substantial increase in skin IL-1 alpha mRNA and bioactivity post-UV exposure compared to DBA/2 mice.
- DBA/2 mice showed only a slight increase in skin IL-1 alpha mRNA.
Conclusions:
- Cutaneous production of IL-1 is a key mechanism in the UV-induced exacerbation of lupus in NZB mice.
- Targeting IL-1 may offer a therapeutic strategy for managing UV-induced lupus flares.