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Critical Reviews™ in Immunology
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ISSN Imprimir: 1040-8401
ISSN En Línea: 2162-6472

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Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.v37.i2-6.160
pages 555-583

lnterleukin-1 Receptor Antagonist

Andrew C. Lennard
Yamanouchi Research Institute U.K., Littlemore Hospital, Oxford OX4 4XN, U.K.

SINOPSIS

The interleukin-1 receptor antagonist (IL-lra) is unusual in that it is the only known naturally occurring, cytokine receptor antagonist with no apparent agonist function. Over the last 5 years, since the cloning of the IL-lra cDNA sequence, there has been intensive research on the genetics, regulation, and potential therapeutic value of this protein. The later discovery of a second form of IL-lra in 1991 has complicated the picture. Whereas the originally described IL-lra is predominantly glycosylated and secreted (sIL-lra), the alternative isoform is unglycosylated and intracellular (icIL-lra). Although the biological roles of the two forms are still open to question, IL-lra is likely to be of great importance in the pathogenesis of both acute and chronic inflammatory diseases. A large body of evidence for this conclusion has come from animal models of inflammatory disease that respond well to administration of exogenous IL-lra. A role for recombinant IL-lra in the management of human disease is still under investigation. The two forms of IL-lra are encoded by a single gene by alternative usage of two first exons. Expression of sIL-lra and icIl-lra is regulated by two promoters. In this review I explore the genetics of the gene encoding IL-lra (IL-1RN) and the mechanisms of IL-lra gene activation to produce sIL-lra and icIL-lra. Also, possible biological roles for these immunomodulators in health and disease are discussed.


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