title: Phage display against corneal epithelial cells produced bioactive peptides that inhibit Aspergillus adhesion to the corneas.
abstract: Dissection of host-pathogen interactions is important for both understanding the pathogenesis of infectious diseases and developing therapeutics for the infectious diseases like various infectious keratitis. To enhance the knowledge about pathogenesis infectious keratitis, a random 12-mer peptide phage display library was screened against cultured human corneal epithelial cells (HCEC). Fourteen sequences were obtained and BLASTp analysis showed that most of their homologue counterparts in GenBank were for defined or putative proteins in various pathogens. Based on known or predicted functions of the homologue proteins, ten synthetic peptides (Pc-A to Pc-J) were measured for their affinity to bind cells and their potential efficacy to interfere with pathogen adhesion to the cells. Besides binding to HCEC, most of them also bound to human corneal stromal cells and umbilical endothelial cells to different extents. When added to HCEC culture, the peptides induced expression of MyD88 and IL-17 in HCEC, and the stimulated cell culture medium showed fungicidal potency to various extents. While peptides Pc-C and Pc-E inhibited Aspergillus fumigatus (A.f) adhesion to HCEC in a dose-dependent manner, the similar inhibition ability of peptides Pc-A and Pc-B required presence of their homologue ligand Alb1p on A.f. When utilized in an eyeball organ culture model and an in vivo A.f keratitis model established in mouse, Pc-C and Pc-E inhibited fungal adhesion to corneas, hence decreased corneal disruption caused by inflammatory infiltration. Affinity pull-down of HCEC membrane proteins with peptide Pc-C revealed several molecules as potential receptors for this peptide. In conclusion, besides proving that phage display-selected peptides could be utilized to interfere with adhesion of pathogens to host cells, hence could be exploited for managing infectious diseases including infectious keratitis, we also proposed that the phage display technique and the resultant peptides could be used to explore host-pathogen interactions at molecular levels.
authors.affiliation: Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China.
authors.forename: Ge
authors.initials: G
authors.lastname: Zhao
authors.forename: Siyuan
authors.initials: S
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Kun
authors.initials: K
authors.lastname: He
authors.forename: Haijie
authors.initials: H
authors.lastname: Xi
authors.forename: Weihua
authors.initials: W
authors.lastname: Li
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Zhou
authors.forename: Yiqiang
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001230:Aspergillus / Q000502:physiology*; D002448:Cell Adhesion / Q000502:physiology; D019295:Computational Biology; D017931:DNA Primers / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D004847:Epithelial Cells / Q000378:metabolism*; D019573:Epithelium, Corneal / Q000166:cytology / Q000382:microbiology*; D054884:Host-Pathogen Interactions / Q000502:physiology*; D006801:Humans; D020381:Interleukin-17 / Q000378:metabolism; D007634:Keratitis / Q000382:microbiology*; D051379:Mice; D053594:Myeloid Differentiation Factor 88 / Q000378:metabolism; D019151:Peptide Library; D010455:Peptides / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017154:Stromal Cells / Q000378:metabolism; D013778:Tetrazolium Salts; D013844:Thiazoles
chemical_list: D017931:DNA Primers; D020381:Interleukin-17; C507779:MYD88 protein, human; D053594:Myeloid Differentiation Factor 88; D019151:Peptide Library; D010455:Peptides; D013778:Tetrazolium Salts; D013844:Thiazoles; C022616:thiazolyl blue