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Interleukin-8 is a cyclosporin A binding protein
1Institute of Pharmacology and Toxicology, University of Erlangen-Nürnberg, Germany.
Experientia
|July 5, 1993
Summary
Interleukin-8 (IL-8) binds Cyclosporin A (CsA), potentially explaining CsA's anti-inflammatory effects. This suggests IL-8 may be a novel cyclophilin variant lacking enzyme activity.
Area of Science:
- Immunology
- Biochemistry
Background:
- Inflammatory immune reactions, seen in transplant rejection and autoimmune diseases, are mediated by cytokines like interleukin-8 (IL-8).
- Cyclosporin A (CsA) is an immunosuppressant that binds cyclophilins, but its anti-inflammatory mechanisms are not fully understood.
Purpose of the Study:
- To investigate the interaction between IL-8 and CsA.
- To explore potential novel mechanisms for CsA's anti-inflammatory effects.
Main Methods:
- Western blot analysis using antiserum against human recombinant IL-8.
- Binding assays to test native IL-8's interaction with CsA and its analogs.
- Structural analysis to identify potential CsA binding sites on IL-8.
Main Results:
- An antiserum against IL-8 cross-reacted with cyclophilins.
- Native IL-8 specifically bound CsA, but not inactive CsA analogs.
- Structural similarities suggested CsA binding sites on IL-8, though IL-8 lacks peptidyl-prolyl-isomerase (PPlase) activity.
Conclusions:
- The specific binding of CsA to IL-8 may contribute to CsA's anti-inflammatory properties.
- IL-8 might represent a novel class of cyclophilins that do not possess PPlase activity.