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Generation of anti-complement 'prodrugs': cleavable reagents for specific delivery of complement regulators to disease sites

Harris, Claire Louise, Hughes, Clare Elizabeth, Williams, Anwen Sian, Goodfellow, Ian, Evans, David J., Caterson, Bruce and Morgan, Bryan Paul 2003. Generation of anti-complement 'prodrugs': cleavable reagents for specific delivery of complement regulators to disease sites. The Journal of Biological Chemistry 278 (38) , pp. 36068-36076. 10.1074/jbc.M306351200

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Abstract

Expression of biologically active molecules as fusion proteins with antibody Fc can substantially extend the plasma half-life of the active agent but may also influence function. We have previously generated a number of fusion proteins comprising a complement regulator coupled to Fc and shown that the hybrid molecule has a long plasma half-life and retains biological activity. However, several of the fusion proteins generated had substantially reduced biological activity when compared with the native regulator or regulator released from the Fc following papain cleavage. We have taken advantage of this finding to engineer a prodrug with low complement regulatory activity that is cleaved at sites of inflammation to release active regulator. Two model prodrugs, comprising, respectively, the four short consensus repeats of human decay accelerating factor (CD55) linked to IgG4 Fc and the three NH2-terminal short consensus repeats of human decay accelerating factor linked to IgG2 Fc have been developed. In each, specific cleavage sites for matrix metalloproteinases and/or aggrecanases have been incorporated between the complement regulator and the Fc. These prodrugs have markedly decreased complement inhibitory activity when compared with the parent regulator in vitro. Exposure of the prodrugs to the relevant enzymes, either purified, or in supernatants of cytokine-stimulated chondrocytes or in synovial fluid, efficiently cleaved the prodrug, releasing active regulator. Such agents, having negligible systemic effects but active at sites of inflammation, represent a paradigm for the next generation of anti-C therapeutics.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Medicine
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > R Medicine (General)
Q Science > QH Natural history > QH301 Biology
Publisher: American Society for Biochemistry and Molecular Biology
ISSN: 0021-9258
Last Modified: 04 Jun 2017 01:37
URI: http://orca.cf.ac.uk/id/eprint/1050

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