RESUMO
Skin is the ultimate barrier between body and environment and prevents water loss and penetration of pathogens and toxins. Internal and external stressors, such as ultraviolet radiation (UVR), can damage skin integrity and lead to disorders. Therefore, skin health and skin ageing are important concerns and increased research from cosmetic and pharmaceutical sectors aims to improve skin conditions and provide new anti-ageing treatments. Biomolecules, compared to low molecular weight drugs and cosmetic ingredients, can offer high levels of specificity. Topically applied enzymes have been investigated to treat the adverse effects of sunlight, pollution and other external agents. Enzymes, with a diverse range of targets, present potential for dermatological use such as antioxidant enzymes, proteases and repairing enzymes. In this review, we discuss enzymes for dermatological applications and the challenges associated in this growing field.
Assuntos
Cosméticos , Dermatopatias , Humanos , Raios Ultravioleta/efeitos adversos , Pele , Dermatopatias/terapia , Luz Solar/efeitos adversos , Cosméticos/farmacologiaRESUMO
The present study describes a new species of Henneguya infecting the ornamental fish Caquetaia spectabilis from the Brazilian Amazon. Fish specimens were collected where the Tapajós and Amazon rivers merge, municipality of Santarém in the State of Pará, Brazil. Infections were intense, with several plasmodia spread on the opercula, fins and eye. Phylogenetic characterization and host-parasite relationship studies of the new Henneguya species used a combination of small subunit ribosomal DNA (ssrDNA) and morphological (photonic and transmission electron microscopy) analyses. Plasmodia were white round to ellipsoidal measuring up to 1.8 mm. The myxospores body measured 20.5 ± 3.9 (15-27) in length, 7.9 µm (6.2-10.8) in width, 6.7 µm (6.0-7.6) in thickness, 20.5 µm (14.4-32.3) in caudal appendages length, and 40.6 µm (34.2-54.6) in total length. The two polar capsules were elongated and equal in size, measuring 4.3 µm (3.3-5.4) in length and 2.1 µm (1.3-2.8) in width. Histological analysis revealed the parasite development in connective tissues of the fins, eyes and opercula. The skin of the fins and opercula presented detachment of the epidermis, however, no inflamatory infiltrate was observed. In the eye were observed inflammatory infiltratate in the epithelium and stroma of the cornea. Ultrastructure analysis showed the connective tissue capsule composed by an inner cellular layer with fibroblasts and outer layer where collagen fibers arranged transversely yet interspersed by layers of fibers arranged longitudinally. Numerous invaginations and extensive pinocytotic channels were observed in the plasmodial membrane. A layer of microfilament-like microfilament-like material was observed in the ectoplasm area and along to the internal surface of the plasmodial membrane. Generative cells and early stages of sporogenesis were seen more internally. The ssrDNA based phylogeny showed the South American species grouped in two lineages and the new species arises in a well-sustained subclade as sister branch of the clade composed by Henneguya spp. parasites of cichlids fish.
Assuntos
Ciclídeos , Doenças dos Peixes , Myxozoa , Doenças Parasitárias em Animais , Animais , Filogenia , Interações Hospedeiro-Parasita , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Brasil , Doenças Parasitárias em Animais/parasitologiaRESUMO
Mycosporine-like amino acids (MAAs) are natural UV-absorbing sunscreens that evolved in cyanobacteria and algae to palliate harmful effects from obligatory exposure to solar radiation. Multiple lines of evidence prove that in cyanobacteria all MAAs are derived from mycosporine-glycine, which is typically modified by an ATP-dependent ligase encoded by the gene mysD. The function of the mysD ligase has been experimentally described but haphazardly named based solely upon sequence similarity to the d-alanine-d-alanine ligase of bacterial peptidoglycan biosynthesis. Combining phylogeny and alpha-fold tertiary protein structure prediction unambiguously distinguished mysD from d-alanine-d-alanine ligase. The renaming of mysD to mycosporine-glycine-amine ligase (MG-amine ligase) using recognised enzymology rules of nomenclature is, therefore, proposed, and considers relaxed specificity for several different amino acid substrates. The evolutionary and ecological context of MG-amine ligase catalysis merits wider appreciation especially when considering exploiting cyanobacteria for biotechnology, for example, producing mixtures of MAAs with enhanced optical or antioxidant properties.
Assuntos
Aminoácidos , Cianobactérias , Aminoácidos/química , Glicina/metabolismo , Cianobactérias/metabolismo , Alanina/metabolismo , Aminas/metabolismo , Ligases/metabolismo , Raios UltravioletaRESUMO
Cyanobacteria are oxygenic phototrophic prokaryotes that have evolved to produce ultraviolet-screening mycosporine-like amino acids (MAAs) to lessen harmful effects from obligatory exposure to solar UV radiation. The cyanobacterial MAA biosynthetic cluster is formed by a gene encoding 2-epi-5-epi-valiolone synthase (EVS) located immediately upstream from an O-methyltransferase (OMT) encoding gene, which together biosynthesize the expected MAA precursor 4-deoxygadusol. Accordingly, these genes are typically absent in non-producers. In this study, the relationship between gene cluster architecture and constitutive production of MAAs was evaluated in cyanobacteria isolated from various Brazilian biomes. Constitutive production of MAAs was only detected in strains where genes formed a co-linear cluster. Expectedly, this production was enhanced upon exposure of the strains to UV irradiance and by using distinct culture media. Constitutive production of MAAs was not detected in all other strains and, unexpectedly, production could not be induced by exposure to UV irradiation or changing growth media. Other photoprotection strategies which might be employed by these MAA non-producing strains are discussed. The evolutionary and ecological significance of gene order conservation warrants closer experimentation, which may provide a first insight into regulatory interactions of genes encoding enzymes for MAA biosynthesis.
Assuntos
Aminoácidos , Cianobactérias , Aminoácidos/química , Brasil , Cianobactérias/genética , Cianobactérias/metabolismo , Raios Ultravioleta , Família MultigênicaRESUMO
Asparaginases (ASNases) are a large and structurally diverse group of enzymes ubiquitous amongst archaea, bacteria and eukaryotes, that catalyze hydrolysis of asparagine to aspartate and ammonia. Bacterial ASNases are important biopharmaceuticals for the treatment of acute lymphoblastic leukemia, although some patients experience adverse allergic side effects during treatment with these protein therapeutics. ASNases are currently divided into three families: plant-type ASNases, Rhizobium etli-type ASNases and bacterial-type ASNases. This system is outdated as both bacterial-type and plant-type families also include archaeal, bacterial and eukaryotic enzymes, each with their own distinct characteristics. Herein, phylogenetic studies allied to tertiary structural analyses are described with the aim of proposing a revised and more robust classification system that considers the biochemical diversity of ASNases. Accordingly, based on distinct peptide domains, phylogenetic data, structural analysis and functional characteristics, we recommend that ASNases now be divided into three new distinct classes containing subgroups according to structural and functional aspects. Using this new classification scheme, 25 ASNases were identified as candidates for future new lead discovery.
Assuntos
Asparaginase , Leucemia-Linfoma Linfoblástico de Células Precursoras , Asparaginase/química , Bactérias/metabolismo , Humanos , Hidrólise , FilogeniaRESUMO
Venomous animals can deploy toxins for both predation and defense. These dual functions of toxins might be expected to promote the evolution of new venoms and alteration of their composition. Cnidarians are the most ancient venomous animals but our present understanding of their venom diversity is compromised by poor taxon sampling. New proteomic data were therefore generated to characterize toxins in venoms of a staurozoan, a hydrozoan, and an anthozoan. We then used a novel clustering approach to compare venom diversity in cnidarians to other venomous animals. Comparison of the presence or absence of 32 toxin protein families indicated venom composition did not vary widely among the 11 cnidarian species studied. Unsupervised clustering of toxin peptide sequences suggested that toxin composition of cnidarian venoms is just as complex as that in many venomous bilaterians, including marine snakes. The adaptive significance of maintaining a complex and relatively invariant venom remains unclear. Future study of cnidarian venom diversity, venom variation with nematocyst types and in different body regions are required to better understand venom evolution.
Assuntos
Cnidários/química , Venenos de Cnidários/química , Proteoma , Animais , Proteômica , Análise de Sequência de ProteínaRESUMO
ABSTRACT Objectives: Prostate cancer is the most common and fatal cancer amongst Brazilian males. The quality of prostate cancer care in Brazil was systematically reviewed and compared to United Kingdom (UK) National Institute for Health and Care Excellence (NICE) guidelines, which are considered an international benchmark in care, to deter- mine any treatment gaps in Brazilian practice. Materials and Methods: A systematic review of Brazilian and UK literature was under- taken. Additionally, quality of life scores was measured using a FACT-P questionnaire of 36 prostate cancer patients attending the Farmácia Universitária da Universidade de São Paulo (FARMUSP). These scores were compared against NICE care measures for patient safety, clinical efficacy and quality of life indicators determined by either quantitative or qualitative methods. Key findings: The quality of prostate cancer care in Brazil was considered good when compared to NICE guidelines. However, FACT-P data strongly indicated a poor under- standing of treatment received by Brazilian patients and that their mental health needs were not being met. Conclusions: NICE quality statements that address the holistic needs of patients should be implemented into Brazilian outpatient care plans. Addressing the non-medical concerns of patients may improve quality of life and can be easily rolled-out through existing Brazilian pharmacy services at no financial cost to the Brazilian Unified Health System (SUS).
Assuntos
Humanos , Masculino , Assistência Farmacêutica/normas , Neoplasias da Próstata/tratamento farmacológico , Garantia da Qualidade dos Cuidados de Saúde/métodos , Qualidade de Vida , Assistência Ambulatorial/normas , Padrões de Referência , Brasil , Inquéritos e Questionários/normas , Lista de Checagem/normas , Reino UnidoRESUMO
L-asparaginase is an enzyme produced by microorganisms, plants, and animals, which is used clinically for the treatment for acute lymphoblastic leukemia (ALL) and, in the food industry, to control acrylamide formation in baked foods. The purpose of this review was to evaluate the available literature regarding microbial sources of L-asparaginase, culture media used to achieve maximum enzyme expression in microbial fermentations, and assay methods employed to assess L-asparaginase activity. Studies were gathered by searching PubMed, and Web of Science databases before January 22, 2018, with no time restrictions. The articles were evaluated according to the source of L-asparaginase being studied, the nitrogen source in the culture medium, the type of sample, and the method employed to evaluate L-asparaginase activity. Bacterial L-asparaginase appeared to be the most commonly studied source of the enzyme and, most often, the enzyme activity was assayed from crude protein extracts using the Nessler method, which is an indirect measurement of asparaginase activity that determines the concentration of ammonia generated after the action of the enzyme on the substrate, L-asparagine. However, ammonia is also generated throughout microbial fermentations and this endogenous ammonia will also reduce the Nessler reagent if crude microbial extracts are used to determine total L-asparaginase activity. We suggest that current estimates of L-asparaginase activity reported in the literature may be overestimated when Nessler reagent is used, since we were unable to find a single study that made reference to the possible inference of fermentation derived ammonia.
Assuntos
Asparaginase/metabolismo , Bactérias/enzimologia , Bioensaio/normas , Amônia/metabolismo , Asparagina/metabolismo , Bioensaio/métodos , Meios de Cultura , FermentaçãoRESUMO
OBJECTIVES: Prostate cancer is the most common and fatal cancer amongst Brazilian males. The quality of prostate cancer care in Brazil was systematically reviewed and compared to United Kingdom (UK) National Institute for Health and Care Excellence (NICE) guidelines, which are considered an international benchmark in care, to determine any treatment gaps in Brazilian practice. MATERIALS AND METHODS: A systematic review of Brazilian and UK literature was undertaken. Additionally, quality of life scores was measured using a FACT-P questionnaire of 36 prostate cancer patients attending the Farmácia Universitária da Universidade de São Paulo (FARMUSP). These scores were compared against NICE care measures for patient safety, clinical effi cacy and quality of life indicators determined by either quantitative or qualitative methods. Key fi ndings: The quality of prostate cancer care in Brazil was considered good when compared to NICE guidelines. However, FACT-P data strongly indicated a poor understanding of treatment received by Brazilian patients and that their mental health needs were not being met. CONCLUSIONS: NICE quality statements that address the holistic needs of patients should be implemented into Brazilian outpatient care plans. Addressing the non-medical concerns of patients may improve quality of life and can be easily rolled-out through existing Brazilian pharmacy services at no fi nancial cost to the Brazilian Unifi ed Health System (SUS).
Assuntos
Assistência Ambulatorial/normas , Assistência Farmacêutica/normas , Neoplasias da Próstata/tratamento farmacológico , Garantia da Qualidade dos Cuidados de Saúde/métodos , Qualidade de Vida , Brasil , Lista de Checagem/normas , Humanos , Masculino , Padrões de Referência , Inquéritos e Questionários/normas , Reino UnidoRESUMO
Three different polyhydroxyalkanoate (PHA) synthase genes (Ralstonia eutropha H16, Aeromonas sp. TSM81 or Aeromonas hydrophila ATCC7966 phaC) were introduced into the chromosome of two Pseudomonas strains: a native medium-chain-length 3-polyhydroxyalkanoate (PHAMCL) producer (Pseudomonas sp. LFM046) and a UV-induced mutant strain unable to produce PHA (Pseudomonas sp. LFM461). We reported for the first time the insertion of a chromosomal copy of phaC using the transposon system mini-Tn7. Stable antibiotic marker-free and plasmid-free recombinants were obtained. Subsequently, P(3HB-co-3HAMCL) was produced by these recombinants using glucose as the sole carbon source, without the need for co-substrates and under antibiotic-free conditions. A recombinant harboring A. hydrophila phaC produced a terpolyester composed of 84.2 mol% of 3-hydroxybutyrate, 6.3 mol% of 3-hydroxyhexanoate, and 9.5 mol% of 3-hydroxydecanoate from only glucose. Hence, we were successful in increasing the industrial potential of Pseudomonas sp. LFM461 strain by producing PHA copolymers containing 3HB and 3HAMCL using an unrelated carbon source, for the first time in a plasmid- and antibiotic-free bioprocess.