title: Peptides with differential cytolytic activity from skin secretions of the lemur leaf frog Hylomantis lemur (Hylidae: Phyllomedusinae).
abstract: Two peptides with differential cytolytic activity against bacteria, a fungus pathogenic to amphibians, and mammalian cells were isolated from norepinephrine-stimulated skin secretions of the Lemur leaf frog Hylomantis lemur Boulenger, 1882. Dermaseptin-L1 (GLWSKIKEAAKAAGKAALNAVTGLVNQGDQPS) was active against the Gram-negative bacterium Escherichia coli (MIC=8 microM) but inactive against the Gram-positive bacterium Staphylococcus aureus. This peptide inhibited growth of zoospores of the chytrid fungus Batrachochytrium dendrobatidis at concentrations above 25 microM but did not completely inhibit growth at 100 microM. Phylloseptin-L1 (LLGMIPLAISAISALSKL.NH2) was active against S. aureus (MIC=8 microM) but was inactive against E. coli. This peptide also inhibited growth of B. dendrobatidis zoospores at concentrations above 25 microM with complete inhibition at 100 microM. Dermaseptin-L1 showed selective cytolytic activity against HepG2 human hepatoma-derived cells (LC50=45 microM) compared with human erythrocytes (LC50=200 microM) whereas phylloseptin-L1 was approximately equipotent against both HepG2 cells (LC50=35 microM) and erythrocytes (LC50=40 microM).
authors.affiliation: Department of Biochemistry, Faculty of Medicine and Health Sciences, United Arab Emirates University, 17666 Al-Ain, United Arab Emirates. jmconlon@uaeu.ac.ae
authors.forename: J Michael
authors.initials: JM
authors.lastname: Conlon
authors.forename: Douglas C
authors.initials: DC
authors.lastname: Woodhams
authors.forename: Haider
authors.initials: H
authors.lastname: Raza
authors.forename: Laurent
authors.initials: L
authors.lastname: Coquet
authors.forename: Jérôme
authors.initials: J
authors.lastname: Leprince
authors.forename: Thierry
authors.initials: T
authors.lastname: Jouenne
authors.forename: Hubert
authors.initials: H
authors.lastname: Vaudry
authors.forename: Louise A
authors.initials: LA
authors.lastname: Rollins-Smith
mesh_terms: D000595:Amino Acid Sequence; D029845:Amphibian Proteins / Q000302:isolation & purification* / Q000494:pharmacology; D000818:Animals; D000890:Anti-Infective Agents / Q000302:isolation & purification* / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000302:isolation & purification* / Q000494:pharmacology; D001001:Anura / Q000378:metabolism*; D045744:Cell Line, Tumor; D004926:Escherichia coli / Q000187:drug effects; D006801:Humans; D008969:Molecular Sequence Data; D009638:Norepinephrine / Q000494:pharmacology; D010455:Peptides / Q000302:isolation & purification* / Q000494:pharmacology; D012867:Skin / Q000378:metabolism*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D029845:Amphibian Proteins; D000890:Anti-Infective Agents; D000970:Antineoplastic Agents; D010455:Peptides; D009638:Norepinephrine