title: Chemical modification of recombinant human keratinocyte growth factor 2 with polyethylene glycol improves biostability and reduces animal immunogenicity.
abstract: Recombinant human keratinocyte growth factor 2 (rhKGF-2) is a member of fibroblast growth factor protein family currently being investigated for its promising significant effects in treating epithelial damage. Molecular modification with polyethylene glycol (PEGylation) is an effective approach to improve protein biostability and decrease protein immunogenic activity. In this study, we modified rhKGF-2 through PEGylation at N-terminal residue using 20 kDa PEG-phenyl-isothiocyanate (PIT-PEG20K). PEGylated rhKGF-2 is then purified to near homogeneity by Sephadex G-25 gel filtration followed by a Heparin Sepharose TM CL-6B affinity chromatography. This PEGylated rhKGF-2 retained about 60% of mitogenic activity compared to the non-modified rhKGF-2. Its relative thermal stability at normal physiological temperature and structural stability were significantly enhanced. Moreover, the immunogenicity of PEGylated rhKGF-2 in mice is significant decreased compared to non-modified rhKGF-2. These results suggest that PEGylation of rhKGF-2 could be a more effective approach to the pharmacological and therapeutic application of rhKGF-2.
authors.affiliation: Key Laboratory of Biotechnology and Pharmaceutical Engineering of Zhejiang Province, Wenzhou Medical College, Wenzhou 325035, China.
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Huang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Ni
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Chu
authors.forename: Shanshan
authors.initials: S
authors.lastname: Wang
authors.forename: Shulin
authors.initials: S
authors.lastname: Yang
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wu
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaokun
authors.initials: X
authors.lastname: Li
authors.forename: Wenke
authors.initials: W
authors.lastname: Feng
authors.forename: Shaoqiang
authors.initials: S
authors.lastname: Lin
mesh_terms: D000818:Animals; D002460:Cell Line; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D051526:Fibroblast Growth Factor 10 / Q000737:chemistry* / Q000276:immunology / Q000378:metabolism* / Q000493:pharmacokinetics; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D051379:Mice; D008807:Mice, Inbred BALB C; D008856:Microscopy, Fluorescence; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000378:metabolism; D011489:Protein Denaturation; D055550:Protein Stability; D051381:Rats; D011994:Recombinant Proteins / Q000737:chemistry / Q000276:immunology / Q000378:metabolism / Q000493:pharmacokinetics; D014357:Trypsin / Q000378:metabolism; D014508:Urea / Q000737:chemistry
chemical_list: D051526:Fibroblast Growth Factor 10; D007074:Immunoglobulin G; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D014508:Urea; D014357:Trypsin