title: Designed amphiphilic peptide forms stable nanoweb, slowly releases encapsulated hydrophobic drug, and accelerates animal hemostasis.
abstract: How do you design a peptide building block to make 2-dimentional nanowebs and 3-dimensional fibrous mats? This question has not been addressed with peptide self-assembling nanomaterials. This article describes a designed 9-residue peptide, N-Pro-Ser-Phe-Cys-Phe-Lys-Phe-Glu-Pro-C, which creates a strong fishnet-like nanostructure depending on the peptide concentrations and mechanical disruptions. This peptide is intramolecularly amphiphilic because of a single pair of ionic residues, Lys and Glu, at one end and nonionic residues, Phe, Cys, and Phe, at the other end. Circular dichroism and Fourier transform infrared spectroscopy analysis demonstrated that this peptide adopts stable beta-turn and beta-sheet structures and self-assembles into hierarchically arranged supramolecular aggregates in a concentration-dependent fashion, demonstrated by atomic force microscopy and electron microscopy. At high concentrations, the peptide dominantly self-assembled into globular aggregates that were extensively connected with each other to form "beads-on-a-thread" type nanofibers. These long nanofibers were extensively branched and overlapped to form a self-healing peptide hydrogel consisting of >99% water. This peptide can encapsulate the hydrophobic model drug pyrene and slowly release pyrene from coated microcrystals to liposomes. It can effectively stop animal bleeding within 30 s. We proposed a plausible model to interpret the intramolecular amphiphilic self-assembly process and suggest its importance for the future development of new biomaterials for drug delivery and regenerative medicine.
authors.affiliation: West China Hospital Institute for Nanobiomedical Technology and Membrane Biology, West China Hospital and State Key Lab of Biotherapy of Human Diseases, Sichuan University, Chengdu, 610041 Sichuan, China.
authors.forename: Liping
authors.initials: L
authors.lastname: Ruan
authors.forename: Hangyu
authors.initials: H
authors.lastname: Zhang
authors.forename: Hanlin
authors.initials: H
authors.lastname: Luo
authors.forename: Jingping
authors.initials: J
authors.lastname: Liu
authors.forename: Fushan
authors.initials: F
authors.lastname: Tang
authors.forename: Ying-Kang
authors.initials: YK
authors.lastname: Shi
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Zhao
mesh_terms: D000818:Animals; D016503:Drug Delivery Systems / Q000379:methods*; D005260:Female; D006470:Hemorrhage / Q000188:drug therapy; D008081:Liposomes; D049329:Nanostructures / Q000737:chemistry* / Q000627:therapeutic use; D010455:Peptides / Q000737:chemistry* / Q000627:therapeutic use; D017433:Protein Structure, Secondary; D011721:Pyrenes / Q000008:administration & dosage; D051381:Rats; D017207:Rats, Sprague-Dawley; D013501:Surface-Active Agents
chemical_list: D008081:Liposomes; D010455:Peptides; D011721:Pyrenes; D013501:Surface-Active Agents; C030984:pyrene