title: High molecular weight PEGylation of human pancreatic polypeptide at position 22 improves stability and reduces food intake in mice.
abstract: Human pancreatic polypeptide (hPP) is known to suppress appetite and food intake, thereby representing a potential therapeutic approach against obesity and associated metabolic disorders. The aim of this study was to improve hPP stability by covalent PEGylation with diverse molecular weight polyethylene glycols (PEGs) at two positions using promising lead structures while maintaining target activity.
  
  
  
  Modified peptides were synthesized by combined solid-phase and solution-phase peptide synthesis. Their potency was investigated in constitutively expressing human epithelial cells and isolated human colonic mucosa as well as receptor-transfected artificial cell lines. Human blood plasma and porcine liver homogenates were used to examine the in vitro stability of the analogues. The most promising variants were injected s.c. in C57BL/6JRj mice to monitor fasting-induced food intake and bioavailability.
  
  
  
  In human epithelia and colonic mucosal preparations, activity of the modified hPP peptides depended on the core sequence and latency of the peptides was related to PEG size. Peptides modified with a 22 kDa PEG (PEG22) remained intact in blood plasma and on incubation with liver homogenates for more than 96 h. Finally, hPP2-36, [K22(PEG22)]hPP2-36and [K22(PEG22),Q34]hPP significantly reduced cumulative food intake in mice over 16 h after s.c. administration.
  
  
  
  Modification with PEG22 at position 22 stabilizes hPP significantly while extending its biological activities and could be used in drug development prospectively.
authors.affiliation: Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry, Universität Leipzig, Leipzig, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Thieme
authors.affiliation: Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, Guy's Campus, London, UK.
authors.forename: N
authors.initials: N
authors.lastname: Jolly
authors.affiliation: Department of Neuroscience and Pharmacology, Laboratory for Molecular Pharmacology, The Panum Institute, University of Copenhagen, Copenhagen, Denmark.
authors.forename: A N
authors.initials: AN
authors.lastname: Madsen
authors.affiliation: Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry, Universität Leipzig, Leipzig, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Bellmann-Sickert
authors.affiliation: Department of Neuroscience and Pharmacology, Laboratory for Molecular Pharmacology, The Panum Institute, University of Copenhagen, Copenhagen, Denmark.
authors.forename: T W
authors.initials: TW
authors.lastname: Schwartz
authors.affiliation: Department of Neuroscience and Pharmacology, Laboratory for Molecular Pharmacology, The Panum Institute, University of Copenhagen, Copenhagen, Denmark.
authors.forename: B
authors.initials: B
authors.lastname: Holst
authors.affiliation: Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, Guy's Campus, London, UK.
authors.forename: H M
authors.initials: HM
authors.lastname: Cox
authors.affiliation: Faculty of Biosciences, Pharmacy and Psychology, Institute of Biochemistry, Universität Leipzig, Leipzig, Germany. abeck-sickinger@uni-leipzig.de.
authors.forename: A G
authors.initials: AG
authors.lastname: Beck-Sickinger
mesh_terms: D000818:Animals; D004435:Eating / Q000187:drug effects*; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008970:Molecular Weight; D010191:Pancreatic Polypeptide / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D011092:Polyethylene Glycols / Q000378:metabolism*
chemical_list: D011092:Polyethylene Glycols; D010191:Pancreatic Polypeptide