Reconstitution of the functional mouse oncostatin M (OSM) receptor:: Molecular cloning of the mouse OSM receptor β subunit

被引:79
作者
Tanaka, M
Hara, T
Copeland, NG
Gilbert, DJ
Jenkins, NA
Miyajima, A
机构
[1] Univ Tokyo, Inst Mol & Cellular Biosci, Bunkyo Ku, Tokyo 1130032, Japan
[2] NCI, Mammalian Genet Lab, Adv Biosci Labs, Basic Res Program,Frederick Canc Res & Dev Ctr, Frederick, MD 21701 USA
关键词
D O I
10.1182/blood.V93.3.804.403a16_804_815
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Oncostatin M (OSM) is a member of the interleukin-6 (IL-6) family of cytokines that share the gp130 receptor subunit. Of these family members, leukemia inhibitory factor (LIF) is most closely related to OSM, and various overlapping biologic activities have been described between human LIF and OSM (hLIF and hOSM). Two types of functional hOSM receptors are known: the type I OSM receptor is identical to the LIF receptor that consists of gp130 and the LIF receptor beta subunit (LIFR beta), and the type II OSM receptor consists of gp130 and the OSM receptor beta subunit (OSMR beta). It is thus conceivable that common biologic activities between hLIF and hOSM are mediated by the shared type I receptor and OSM-specific activities are mediated by the type II receptor. However, in contrast to the human receptors, recent studies have demonstrated that mouse OSM (mOSM) does not activate the type I receptor and exhibits unique biologic activity. To elucidate the molecular structure of the functional mOSM receptor, we cloned a cDNA encoding mOSMR beta, which is 55.5% identical to the hOSMR beta at the amino acid level, mOSM-responsive cell lines express high-affinity mOSM receptors, as well as mOSMR beta, whereas embryonic stem cells, which are responsive to LIF but not to mOSM, do not express mOSMR beta. mOSMR beta alone binds mOSM with low affinity (kd = 13.0 nmol/L) and forms a high-affinity receptor (kd = 606 pmol/L) with gp130. Ba/F3 transfectants expressing both mOSMR beta and gp130 proliferated in response to mOSM, but failed to respond to LIF and human OSM. Thus, the cloned mOSMR beta constitutes an essential and species-specific receptor component of the functional mOSM receptor. Reminiscent of the colocalization of the mOSM and mLIF genes, the mOSMR beta gene was found to be located in the vicinity of the LIFR beta locus in the proximal end of chromosome 15. (C) 1999 by The American Society of Hematology.
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页码:804 / 815
页数:12
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