The Journal of Experimental Medicine
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J. Exp. Med., Volume 187, Number 4, February 16, 1998 571-578

The Orphan Receptor CRF2-4 Is an Essential Subunit of the Interleukin 10 Receptor

By Susan D. Spencer,* Francesco Di Marco,Dagger Jeff Hooley,* Sharon Pitts-Meek,* Michele Bauer,* Anne M. Ryan,* Bernard Sordat,Dagger Verna C. Gibbs,§ and Michel AguetDagger

From the * Genentech Inc., South San Francisco, California 94080; the Dagger  Swiss Institute for Experimental Cancer Research, 1066 Epalinges s/Lausanne, Switzerland; and the § Department of Surgery, San Francisco Veterans Affairs Medical Center, San Francisco, California 94121

The orphan receptor CRF2-4 is a member of the class II cytokine receptor family (CRF2), which includes the interferon receptors, the interleukin (IL) 10 receptor, and tissue factor. CRFB4, the gene encoding CRF2-4, is located within a gene cluster on human chromosome 21 that comprises three interferon receptor subunits. To elucidate the role of CRF2-4, we disrupted the CRFB4 gene in mice by means of homologous recombination. Mice lacking CRF2-4 show no overt abnormalities, grow normally, and are fertile. CRF2-4 deficient cells are normally responsive to type I and type II interferons, but lack responsiveness to IL-10. By ~12 wk of age, the majority of mutant mice raised in a conventional facility developed a chronic colitis and splenomegaly. Thus, CRFB4 mutant mice recapitulate the phenotype of IL-10-deficient mice. These findings suggest that CRF2-4 is essential for IL-10-mediated effects and is a subunit of the IL-10 receptor.


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