Mammalian cytokine, IL-11

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

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435 711, 4352402, 4352523, 4353201, 530351, 424 852, 536 231, 536 235, C12N 1524, C07K 1454, A61K 3820

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active

057006644

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a novel cytokine that stimulates the function of cells of the immune and hematopoietic systems, and to processes for obtaining the factor and producing it by recombinant genetic engineering techniques.


BACKGROUND OF THE INVENTION

A growing family of regulatory proteins that deliver signals between cells of the immune system has been identified. These regulatory molecules are known as cytokines. Many of the cytokines have been found to control the growth and development, as well as the biological activities of cells of the hematopoietic and immune systems. These regulatory molecules include all of the colony-stimulating factors (e.g., GM-CSF, G-CSF, M-CSF, and multi CSF or interleukin-3), the interleukins (IL-1 through IL-9), the interferons (alpha, beta and gamma), the tumor necrosis factors (alpha and beta), erythropoietin, macrophage inhibitory proteins, the tumor growth factors and leukemia inhibitory factor (LIF). These cytokines exhibit a wide range of biological activities with target cells from bone marrow, peripheral blood, fetal liver, and other lymphoid or hematopoietic organs. See, e.g., F. R. Balkwill and F. Burke, Immunology Today, 10(9):299 (1989); G. Wong and S. Clark, Immunology Today, 9(5):137 (1988); and S. C. Clark and R. Kamen, Science, 236:1229-1237 (1987).
The biochemical and biological identification and characterization of certain cytokines was hampered by the small quantities of the naturally occurring factors available from natural sources, e.g., blood and urine. Many of the cytokines have recently been molecularly cloned, heterologously expressed and purified to homogeneity. Several of these purified factors have been found to demonstrate regulatory effects on the hematopoietic and immune systems in vivo, including GM-CSF, M-CSF, G-CSF, IL-1, IL-2, IL-3, IL-6, IL-7, TNF, the interferons and erythropoietin.
There remains a need in the art for additional proteins purified from their natural sources or otherwise produced in homogeneous form, which are capable of stimulating or enhancing immune responsiveness and hematopoietic cell development, which are suitable for pharmaceutical use.


SUMMARY OF THE INVENTION

In one aspect the present invention provides a novel mammalian cytokine, called IL-11, which is substantially free from other mammalian proteins. This protein may be produced by recombinant genetic engineering techniques. It may also be purified from cell sources producing the factor naturally or upon induction with other factors. IL-11 may also be synthesized by chemical techniques, or a combination of the above-listed techniques.
Active, mature mammalian IL-11 is an approximately 178 amino acid protein, characterized by an apparent molecular weight of approximately 20 kd, as determined by analyzing .sup.35 S methionine labelled supernatant fluid derived from IL-11 cDNA transfected COS-1 cells on sodium dodecylsulfate polyacrylamide gel electrophoresis. The calculated molecular weight for the mature protein is also approximately 20 kd.
The IL-11 protein of this invention has displayed biological activities in various assays, which indicate its role as a general stimulator of a variety of hematopoietic and immune functions. The IL-11 protein of this invention demonstrates proliferative activity in an IL-6 dependent mouse plasmacytoma cell line, T1165. IL-11 has also demonstrated in preliminary assays, the ability to stimulate, either directly or indirectly, the maturation of B cells. Specifically, IL-11 is believed to stimulate the T cell dependent development of B cells. It has further demonstrated synergy with IL-3 in an assay stimulating megakaryocyte proliferation, but may act on other lineages as well.
Another aspect of the present invention is a DNA sequence that encodes the expression of a mammalian IL-11 protein. This DNA sequence may include an isolated DNA sequence that encodes the expression of a mammalian IL-11 protein as described above. The DNA sequence coding for active IL-11 is characterized as comprising the same or subst

REFERENCES:
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