title: Using the MCoTI-II Cyclotide Scaffold To Design a Stable Cyclic Peptide Antagonist of SET, a Protein Overexpressed in Human Cancer.
abstract: The SET protein is a promising drug target in cancer therapy, because of its ability to inhibit the function of the tumor suppressor gene protein phosphatase 2A (PP2A). COG peptides, derived from apolipoprotein E (apoE), are potent antagonists of SET; they induce cytotoxicity in cancer cells upon binding to intracellular SET and modulate the nuclear factor kappa B (NF-κB) signaling pathway. However, the therapeutic potential of COG peptides is limited, because of their poor proteolytic stability and low bioavailability. In this study, the COG peptide, COG1410, was stabilized by grafting it onto the ultrastable cyclic peptide scaffold, Momordica cochinchinensis trypsin inhibitor-II (MCoTI-II). The grafted MCoTI-II peptides were cytotoxic to a cancer cell line and showed high stability in human serum. The most potent grafted MCoTI-II peptide inhibited lipopolysaccharide (LPS)-mediated activation of NF-κB in murine macrophages. Overall, this study demonstrates the application of the MCoTI-II scaffold for the development of stable peptide drugs for cancer therapy.
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Charlotte
authors.initials: C
authors.lastname: D'Souza
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Sónia Troeira
authors.initials: ST
authors.lastname: Henriques
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Conan K
authors.initials: CK
authors.lastname: Wang
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Olivier
authors.initials: O
authors.lastname: Cheneval
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Lai Yue
authors.initials: LY
authors.lastname: Chan
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Nilesh J
authors.initials: NJ
authors.lastname: Bokil
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Sweet
authors.affiliation: Institute for Molecular Bioscience, The University of Queensland , Brisbane, Queensland Australia , 4072.
authors.forename: David J
authors.initials: DJ
authors.lastname: Craik
mesh_terms: D001057:Apolipoproteins E / Q000737:chemistry; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D047169:Cyclotides / Q000737:chemistry / Q000494:pharmacology; D004268:DNA-Binding Proteins; D056488:Histone Chaperones / Q000037:antagonists & inhibitors*; D006801:Humans; D008279:Magnetic Resonance Imaging; D016328:NF-kappa B / Q000378:metabolism; D010456:Peptides, Cyclic / Q000737:chemistry* / Q000494:pharmacology*; D011401:Promoter Regions, Genetic / Q000235:genetics; D054648:Protein Phosphatase 2 / Q000378:metabolism; D014157:Transcription Factors / Q000037:antagonists & inhibitors*
chemical_list: D001057:Apolipoproteins E; D047169:Cyclotides; D004268:DNA-Binding Proteins; D056488:Histone Chaperones; D016328:NF-kappa B; D010456:Peptides, Cyclic; C513473:SET protein, human; D014157:Transcription Factors; C409923:trypsin inhibitor MCoTI-II; D054648:Protein Phosphatase 2