DNA encoding a receptor subunit for oncostatin M

Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Recombinant dna technique included in method of making a...

Reexamination Certificate

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C435S252300, C435S320100, C530S350000, C536S023500, C536S023100

Reexamination Certificate

active

06524817

ABSTRACT:

BACKGROUND OF THE INVENTION
Oncostatin M is a secreted single-chain polypeptide cytokine that regulates the growth of certain tumor-derived and normal cell lines. A number of cell types have been found to bind the oncostatin M protein. See, for example, Linsley et al.,
J. Biol. Chem.,
264: 4282 (1989). Oncostatin M has been shown to inhibit proliferation of a number of tumor cell types (Linsley et al. supra). In contrast, however, this protein has been implicated in stimulating proliferation of Kaposi's sarcoma cells (Nair et al.,
Science
255:1430, 1992; Miles et al.,
Science
255:1432, 1992; and Cai et al.,
Am. J. Pathol.
145:74, 1994).
Identifying and isolating oncostatin M-binding proteins, such as cell surface oncostatin M receptors, is desirable for such reasons as enabling study of the biological signal transduced via the receptor. Such receptors in soluble form also could be used to competitively inhibit a biological activity of oncostatin M in various in vitro assays or in vivo procedures. A soluble form of the receptor could be administered to bind oncostatin M in vivo, thus inhibiting the binding of oncostatin M to endogenous cell surface receptors, for example.
A protein known as gp130 has been found to bind oncostatin M, but with relatively low affinity (Gearing et al.,
Science
255:1434, 1992). Heterodimeric receptors comprising a leukemia inhibitory factor (LIF) receptor and gp130 bind oncostatin M with higher affinity than does gp130 alone, but also bind LIF with high affinity (Gearing et al., supra). For certain applications, a receptor that binds oncostatin M with high affinity, but that does not function as a high affinity LIF receptor, would be advantageous. Prior to the present invention, no such receptor had been identified or isolated.
SUMMARY OF THE INVENTION
The present invention provides a novel polypeptide that is designated herein as the oncostatin M receptor &bgr; subunit (OSM-R&bgr;). Also provided is a receptor comprising OSM-R&bgr; linked (preferably covalently) to an oncostatin M-binding protein known as gp130. The gp130 polypeptide may be covalently linked to the OSM-R&bgr; polypeptide by any suitable means, such as via a cross-linking reagent or a polypeptide linker. In one embodiment of the invention, the receptor is a fusion protein produced by recombinant DNA technology. This receptor comprising OSM-R&bgr; and gp130 binds oncostatin M at levels greater than does gp130 alone. Disorders mediated by oncostatin M may be treated by administering a therapeutically effective amount of this inventive receptor to a patient afflicted with such a disorder.


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