10 documents found, page 1 of 1
The peptide secreted at the water to land transition in a model amphibian has a...
Barbosa, Eder Alves; Plácido, Alexandra; Moreira, Daniel C.; Albuquerque, Lucas; Dematei, Anderson; Silva-Carvalho, Amandda É.; Cabral, Wanessa F.Made available in DSpace on 2022-04-29T08:36:48Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01; In addition to the morphophysiological changes experienced by amphibians during metamorphosis, they must also deal with a different set of environmental constraints when they shift from the water to the land. We found that Pithecopus azureus secretes a single peptide ([M + H]+ = 658.38 Da) at the develo...
The peptide secreted at the water to land transition in a model amphibian has a...
Barbosa, Eder Alves; Plácido, Alexandra; Moreira, Daniel C.; Albuquerque, Lucas; Dematei, Anderson; Carvalho, Amandda É. Silva; Cabral, Wanessa F.In addition to the morphophysiological changes experienced by amphibians during metamorphosis, they must also deal with a different set of environmental constraints when they shift from the water to the land. We found that Pithecopus azureus secretes a single peptide ([M + H]+ = 658.38 Da) at the developmental stage that precedes the onset of terrestrial behaviour. De novo peptide and cDNA sequencing revealed t...
Neuroprotective effects on microglia and insights into the structure–activity r...
Plácido, Alexandra; Amaral, Constança do Pais do; Teixeira, Cátia; Nogueira, Ariane; Brango-Vanegas, José; Barbosa, Eder Alves; Moreira, Daniel C.Tryptophyllins constitute a heterogeneous group of peptides that are one of the first classes of peptides identified from amphibian’s skin secretions. Here, we report the structural characterization and antioxidant properties of a novel tryptophyllin-like peptide, named PpT-2, isolated from the Iberian green frog Pelophylax perezi. The skin secretion of P. perezi was obtained by electrical stimulation and fract...
Novel ocellatin peptides mitigate LPS-induced ROS formation and NF-kB activatio...
Sousa, Nayara A.; Oliveira, Guilherme A. L.; de Oliveira, Ana Patrícia; Lopes, André Luís F.; Iles, Bruno; Nogueira, Kerolayne M.; Araújo, Thiago S. L.Cutaneous secretions of amphibians have bioactive compounds, such as peptides, with potential for biotechnological applications. Therefore, this study aimed to determine the primary structure and investigate peptides obtained from the cutaneous secretions of the amphibian, Leptodactylus vastus, as a source of bioactive molecules. The peptides obtained possessed the amino acid sequences, GVVDILKGAAKDLAGH and GVV...
Lycopene-rich extract from red guava ( Psidium guajava L.) displays cytotoxic e...
Santos, Raimunda C. dos; Ombredane, Alicia S.; Souza, Jéssica Maria T.; Vasconcelos, Andreanne G.; Plácido, Alexandra; Amorim, Adriany das G.N.This study investigated a lycopene-rich extract from red guava (LEG) for its chemical composition using spectrophotometry, mass spectrometry, attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR), and computational studies. The cytotoxic activity of LEG and the underlying mechanism was studied in human breast adenocarcinoma cells (MCF-7), murine fibroblast cells (NIH-3T3), BALB/c murin...
Structure and function of a novel antioxidant peptide from the skin of tropical...
Barbosa, Eder Alves; Oliveira, Ana; Plácido, Alexandra; Socodato, Renato; Portugal, Camila C.; Mafud, Ana Carolina; Ombredane, Alicia S.The amphibian skin plays an important role protecting the organism from external harmful factors such as microorganisms or UV radiation. Based on biorational strategies, many studies have investigated the cutaneous secretion of anurans as a source of bioactive molecules. By a peptidomic approach, a novel antioxidant peptide (AOP) with in vitro free radical scavenging ability was isolated from Physalaemus natter...
Structure and function of a novel antioxidant peptide from the skin of tropical...
Barbosa, Eder Alves; Oliveira, Ana; Plácido, Alexandra; Socodato, Renato; Portugal, Camila C.; Mafud, Ana Carolina; Leite, José Roberto S.A.The amphibian skin plays an important role protecting the organism from external harmful factors such as microorganisms or UV radiation. Based on biorational strategies, many studies have investigated the cutaneous secretion of anurans as a source of bioactive molecules. By a peptidomic approach, a novel antioxidant peptide (AOP) with in vitro free radical scavenging ability was isolated from Physalaemus natter...
Characterization and Biological Activities of Ocellatin Peptides from the Skin ...
Marani, Mariela Mirta; Dourado, Flávio Santos; Quelemes, Patrick Veras; Araujo, Alyne Rodrigues de; Perfeito, Márcia Luana Gomes; Barbosa, Eder AlvesEight new peptides were isolated from the skin secretion of the frog Leptodactylus pustulatus and their amino acid sequences determined by de novo sequencing and by cDNA cloning. Structural similarities between them and other antimicrobial peptides from the skin secretion of Leptodactylus genus frogs were found. Ocellatins-PT1 to -PT5 (25 amino acid residues) are amidated at the C-terminus, while ocellatins-PT6...
Estrutura gênica, inducão, expressão e processamento de peptídeos bioativos iso...
Barbosa, Eder AlvesTese (doutorado)—Universidade de Brasília, Instituto de Biologia, Departamento de Biologia Celular, Programa de Pós-Graduação em Biologia Molecular, 2014.; Esse trabalho descreve um modelo experimental o qual emprega análises da expressão de peptídeos da secreção cutânea de anfíbios, com enfoque nas variações dos níveis de transcrição de genes de interesse e no mapeamento de peptídeos estocados nas glândulas gr...
Avaliação da transcrição, expressão e indução de genes que codificam peptídeos ...
Barbosa, Eder AlvesDissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Biologia Celular, 2010.; O presente trabalho descreve um modelo experimental que permite avaliar as alterações nos níveis de transcrição de RNAs, síntese e processamento de peptídeos presentes nas secreções cutâneas de anfíbios. A partir deste modelo, foram utilizadas ferramentas de biologia molecular em associaçã...