The Journal of Experimental Medicine
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Published online 16 July 2001. doi:10.1084/jem.194.2.189
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© The Rockefeller University Press, 0022-1007/2001/7/189/ $5.00
The Journal of Experimental Medicine, Volume 194, Number 2, July 16, 2001 189-204


Original Article

Defective gp130-mediated Signal Transducer and Activator of Transcription (STAT) Signaling Results in Degenerative Joint Disease, Gastrointestinal Ulceration, and Failure of Uterine Implantation

Matthias Ernsta, Melissa Inglesea, Paul Waringc, Ian K. Campbellb, Shisan Baod, Fiona J. Claya, Warren S. Alexanderb, Ian P. Wicksb, David M. Tarlintonb, Ulrike Novake, Joan K. Heatha, and Ashley R. Dunna
a Ludwig Institute for Cancer Research, PO Royal Melbourne Hospital, VIC 3050, Australia
b The Walter and Eliza Hall Institute, PO Royal Melbourne Hospital, VIC 3050, Australia
c Department of Pathology, Peter MacCallum Institute, East Melbourne VIC 3002, Australia
d Department of Pathology, University of Sydney, Sydney, NSW 2006, Australia
e Department of Surgery, The University of Melbourne Parkville, VIC 3052, Australia

Correspondence to: Matthias Ernst, Ludwig Institute for Cancer Research, PO Royal Melbourne Hospital, VIC 3050, Australia. Tel:61-3-3941-3149 Fax:61-3-9341-3191 E-mail:matthias.ernst{at}ludwig.edu.au.

The receptor subunit gp130 transduces multiple cell type–specific activities of the leukemia inhibitory factor (LIF)/interleukin (IL)-6 family of cytokines through the signal transducer and activator of transcription (STAT) and src homology 2 domain–bearing protein tyrosine phosphatase (SHP)-2/ras/Erk pathways. To define STAT-dependent physiological responses, we generated mice with a COOH-terminal gp130{Delta}STAT "knock-in" mutation which deleted all STAT-binding sites. gp130{Delta}STAT mice phenocopyed mice deficient for IL-6 (impaired humoral and mucosal immune and hepatic acute phase responses) and LIF (failure of blastocyst implantation). However, unlike mice with null mutations in any of the components in the gp130 signaling pathway, gp130{Delta}STAT mice also displayed gastrointestinal ulceration and a severe joint disease with features of chronic synovitis, cartilaginous metaplasia, and degradation of the articular cartilage. Mitogenic hyperresponsiveness of synovial cells to the LIF/IL-6 family of cyto-kines was caused by sustained gp130-mediated SHP-2/ras/Erk activation due to impaired STAT-mediated induction of suppressor of cytokine signaling (SOCS) proteins which normally limits gp130 signaling. Therefore, the joint pathology in gp130{Delta}STAT mice is likely to arise from the disturbance of the otherwise balanced activation of the SHP-2/ras/Erk and STAT signaling cascades emanating from gp130.

Key Words: infertility, signal transduction, STAT, interleukin, gene targeting


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