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Muteins of fibroblast growth factor 21

a growth factor and fibroblast technology, applied in the field of new muteins of fibroblast growth factor 21, can solve the problems of adverse effects on the stability of protein products, triggering association and aggregation, m-cresol,

Inactive Publication Date: 2009-05-07
BEALS JOHN MICHAEL +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A significant challenge in the development of protein pharmaceuticals, such as FGF-21, is to cope with their physical and chemical instabilities.
Unfortunately, these compounds often adversely affect the stability of the protein product, triggering association and aggregation, in particular (Maa et al., Int. J. of Pharmaceutics 140:155-168 (1996); Lam et al., Pharm. Res. 14(6):725-729 (1997)).
However, it has been determined that preservatives, i.e. m-cresol, have an adverse affect on its stability under these conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Expression and Purification of FGF-21 Muteins in E. coli

[0075]The bacterial expression vector pET30a is used for bacterial expression in this example. (Novagen, Inc., Madison, Wis.)). pET30a encodes kanamycin antibiotic resistance gene and contains a bacterial origin of replication (“ori”), a strong T7 phage-IPTG inducible promoter, a ribosome binding site (“RBS”), and suitable MCS with a number of unique restriction endonuclease cleavage sites. Conveniently for purification purpose, the vector can encode His- and S-tags for N-terminal peptide fusions, as well as, a C-terminal His-tag fusion. However, for purposes of the present invention, the cDNA encoding FGF-21 variants is inserted between restriction sites NdeI and BamHI, respectively, and the resulting construct does not take advantage of either of the described tags.

[0076]The nucleic acid sequence encoding the FGF-21 mutein, lacking the leader sequence but substituted with a methionine residue, is amplified from a cDNA clone ...

example 2

Expression and Purification of FGF-21 Muteins in HEK293EBNA Cells

[0087]Alternatively, FGF-21 muteins can be produced in a mammalian cell expression system such as HE 93EBNA cells (EdgeBiosystems, Gaiethersburg, Md.). FGF-21 muteins are subcloned in the proprietary expression vector representing a modification of commercially available pEAK10, between NheI and XbaI restriction sites in the MCS. The cDNA sequence encoding mature FGF-21 is fused in frame with the Igκ leader sequence to enhance secretion of the desired product in the tissue culture media. The expression is driven by the strong viral CMV promoter. HEK93EBNA cells are transiently transfected using a standard transfection reagent such as Fugene (Roche Diagnostics, Indianapolis, Ind.) and the appropriate amount of recombinant plasmid, either as a monolayer or suspension culture, at the adequate cell density. Cells are incubated at 37° C. and 5% CO2, in serum free media, and collections are made every day for 5 days. Typical...

example 3

Expression and Purification of FGF-21 Muteins in Yeast

[0088]Yet another expression system for production of FGF-21 muteins is yeast, such as Pichia pastoris, Pichia methanolica or Saccharomyces cerevisiae. For production in Pichia pastoris a commercially available system (Invitrogen, Carlsbad, Calif.) uses vectors with the powerful AOX1 (alcohol oxidase) promoters to drive high-level expression of recombinant proteins. Alternatively, vectors that use the promoter from the GAP gene (glyceraldehyde-3-phosphate dehydrogenase) are available for high level constitutive expression. The multi-copy Pichia expression vectors allows one to obtain strains with multiple copies of the gene of interest integrated into the genome. Increasing the number of copies of the gene of interest in a recombinant Pichia strain can increase protein expression levels. Yet another yeast expression system is Saccharomyces cerevisiae. Expression vectors contain the promoter and enhancer sequences from the GAL1 ge...

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Abstract

The present invention relates to novel muteins of human fibroblast growth factor 21 with improved pharmaceutical properties. Both protein and the respective encoding nucleic acid species are disclosed. The invention also embodies vectors and host cells for the propagation of said nucleic acid sequences and the production of said muteins. Also disclosed are methods for treating type 2 diabetes, obesity, metabolic syndrome, and in reducing the mortality and morbidity of critically ill patients.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the identification of new muteins of fibroblast growth factor 21 that have improved pharmaceutical properties.[0003]2. Description of the Related Art[0004]Fibroblast growth factors are large polypeptides widely expressed in developing and adult tissues (Baird et al., Cancer Cells, 3:239-243, 1991) and play crucial roles in multiple physiological functions including angiogenesis, mitogenesis, pattern formation, cellular differentiation, metabolic regulation and repair of tissue injury (McKeehan et al., Prog. Nucleic Acid Res. Mol. Biol. 59:135-176, 1998). According to the published literature, the FGF family now consists of at least twenty-three members, FGF-1 to FGF-23 (Reuss et al., Cell Tissue Res. 313:139-157 (2003).[0005]Fibroblast growth factor 21 (FGF-21) has been reported to be preferentially expressed in the liver (Nishimura et al., Biochimica et Biophysica Acta, 1492:203-206, (2...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/18C07K14/50A61K38/00
CPCC07K14/50A61K38/00A61P11/16A61P29/00A61P3/00A61P3/04A61P31/04A61P3/08A61P43/00A61P5/50A61P3/10C12N15/11
Inventor BEALS, JOHN MICHAELFRYE, CHRISTOPHER CARLGLAESNER, WOLFGANGLI, SHUNRATHNACHALAM, RADHAKRISHNANSHANG, JINGSTRIFLER, BETH ANNMICANOVIC, RADMILA
Owner BEALS JOHN MICHAEL
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