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1 and a Novel Cytokine Receptor Subunit, IL-23R1











Departments of
* Immunology,
Molecular Biology, and
Molecular Pathology, DNAX Research, Palo Alto, CA 94304
IL-23 is a heterodimeric cytokine composed of the IL-12p40
"soluble receptor" subunit and a novel cytokine-like subunit
related to IL-12p35, termed p19. Human and mouse IL-23 exhibit some
activities similar to IL-12, but differ in their capacities to
stimulate particular populations of memory T cells. Like IL-12, IL-23
binds to the IL-12R subunit IL-12R
1. However, it does not use
IL-12R
2. In this study, we identify a novel member of the
hemopoietin receptor family as a subunit of the receptor for IL-23,
"IL-23R." IL-23R pairs with IL-12R
1 to confer IL-23
responsiveness on cells expressing both subunits. Human IL-23, but not
IL-12, exhibits detectable affinity for human IL-23R. Anti-IL-12R
1
and anti-IL-23R Abs block IL-23 responses of an NK cell line and
Ba/F3 cells expressing the two receptor chains. IL-23 activates the
same Jak-stat signaling molecules as IL-12: Jak2, Tyk2, and stat1, -3,
-4, and -5, but stat4 activation is substantially weaker and different
DNA-binding stat complexes form in response to IL-23 compared with
IL-12. IL-23R associates constitutively with Jak2 and in a
ligand-dependent manner with stat3. The ability of cells to respond to
IL-23 or IL-12 correlates with expression of IL-23R or IL-12R
2,
respectively. The human IL-23R gene is on human chromosome 1 within 150
kb of IL-12R
2.
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