Abstract
Introduction
Interleukin (IL)-1 is a key orchestrator of inflammation and IL-1 inhibitors are expected to be promising pharmaceutical agents for such pathologies. IL-1 is bound to the complex of two receptor components with much higher affinity than with either receptor component alone.
Materials and Methods
We examined the effect of a heterodimer of IL-1 receptor accessory protein (Acp)-immunoglobulin (Ig) and IL-1R type II (IL1R2)-Ig named AcP-Ig/IL1R2-Ig heterodimer, and compared its effects with other IL-1 inhibitors reported previously.
Results and Discussion
Our results demonstrated that the rat AcP-Ig/IL1R2-Ig heterodimer (IC50 = 1.95 pM) inhibited IL-1 response to a greater extent than IL1RA (IC50 = 1,935 pM), Acp-IL1R type I (IL1R1)-Ig homodimer (IC50 = 73.7 pM) and Acp-IL1R2-Ig homodimer (IC50 = 72.8 pM). Moreover, human AcP-Ig/IL1R2-Ig heterodimer (IC50 = 0.14 pM) inhibited it to a greater extent than Acp-IL1R1-Ig homodimer (IC50 = 4.48 pM) and strongly inhibited responses of both IL-1α and IL-1β.
Conclusions
The AcP-Ig/IL1R2-Ig heterodimer, which is similar to the original extracellular structure of the Acp/IL1R1 complex, may inhibit the IL-1 response more vigorously than other IL-1 blocking biopharmaceutical agents.
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Abbreviations
- Acp:
-
IL-1 receptor accessory protein
- AcP-Ig/IL1R2-Ig heterodimer:
-
Acp-Ig and IL1R2-Ig heterodimer
- CM:
-
Conditioned medium
- EAM:
-
Experimental autoimmune myocarditis
- Glu:
-
Glucagon
- GRO2αC:
-
C-terminal sites of GRO2α
- GRO2αN:
-
N-terminal sites of GRO2α
- Ig:
-
Immunoglobulin
- IL:
-
Interleukin
- IL1R1:
-
IL-1R type I
- IL1R2:
-
IL-1R type II
- IL1RA:
-
IL-1 receptor antagonist
- PCR:
-
Polymerase chain reaction
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Acknowledgments
We thank Dr. J. Miyazaki (Division of Stem Cell Regulation Research, G6, Osaka University Medical School) for providing us with the pCAGGS plasmid vector. This study was supported in part by a Ministry of Health, Labor, and Welfare in Japan Grant “Research on Regulatory Science of Pharmaceutical and Medical Devices.” and by a Grant for scientific research from the Ministry of Education, Science and Culture of Japan (number 20591185).
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No conflict of interest has been declared by the authors.
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Hanawa, H., Ota, Y., Ding, L. et al. IL-1 Receptor Accessory Protein-Ig/IL-1 Receptor Type II-Ig Heterodimer Inhibits IL-1 Response More Strongly than Other IL-1 Blocking Biopharmaceutical Agents. J Clin Immunol 31, 455–464 (2011). https://doi.org/10.1007/s10875-010-9497-z
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DOI: https://doi.org/10.1007/s10875-010-9497-z