Navegando por CNPq "CNPQ::CIENCIAS BIOLOGICAS::MICROBIOLOGIA::BIOLOGIA E FISIOLOGIA DOS MICROORGANISMOS"

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Bioprospecção de leveduras com potencial para a produção de carotenoides presentes em uma microrregião do bioma Amazônia
(Universidade Federal do Pará, 2024-11) LUCAS, David Cristian Rodrigues; CHISTÉ, Renan Campos; http://lattes.cnpq.br/0583058299891937; https://orcid.org/0000-0002-4549-3297
Carotenoids are bioactive compounds used as natural pigments and are found in plants, animals, algae and microorganisms. Some of these compounds are precursors of vitamin A and have benefits to human health such as strengthening the immune system and reducing the risk of chronic degenerative diseases. In industry, the production of carotenoids is obtained mainly by chemical synthesis or through algae and plant extracts. However, with the growing concern about utilization of chemical additives in food by many consumers, the interest in obtaining them through biotechnological processes and diverse microorganisms may synthesize them, such as yeasts. In this work, an exploration study was carried out focused on molecular identification of carotenoid-producing yeasts available in a microregion of Amazonia biome, with the aim of highlighting promising microorganisms for future industrial applications. Samples were collected from leaves, flowers, soil, and bark trees, among them, 4 promising strains were isolated and identified from phyllosphere of philodendron (Philodendron hederaceum): Rhodosporidiobolus ruineniae (PH-18(I)), Rhynchogastrema noutii or Hannaella pagnoccae (dPH-8(I)), Leucosporidium egoroviorum or Lyomyces sp. (dPH-8(II)), and Rhodotorula diobovata or Rhodotorula glutinis (PH-22(II)). The strain PH-18(I) showed a biomass yield of 0.26% to 0.76% and total carotenoid content of 139.70 μg/g of dry biomass. The strain dPH-8(I) showed a biomass yield of 0.43% to 0.96 % and total carotenoid content of 54.26 μg/g. The strain dPH-8(II) demonstrated a biomass yield of 0.35% to 1.12% and total carotenoid content of 52.71 μg/g, while the strain PH-20(II) demonstrated a biomass yield of 11.63 % to 23.67 % and total carotenoid content of 44.98 μg/g. The carotenoids identified in this study were 13Z-β-carotene, (all-E)-β-carotene and 9Z-β-carotene, being (all-E)-β-carotene the majority. Results found in this study highlight a promising perspective for future applications of carotenoid-producing yeasts in the Amazonia biome, being an excellent alternative to replace the process of obtaining carotenoids by synthetic means or by exploitation of vegetal sources.
Acesso aberto (Open Access)
Caracterização de espécies de Leishmania isoladas de Flebotomíneos sp. de três ecótopos da Serra dos Carajás, Pará, Brasil
(Universidade Federal do Pará, 2008) DIAS JUNIOR, Manoel Guacelis de Sena; ISHIKAWA, Edna Aoba Yassui; http://lattes.cnpq.br/3074963539505872
The American cutaneous leishmaniasis (LTA) is an infectious disease, with a high frequency of zoonosis, endemic in the Amazon region, transmitted by sand flies of generous Psychodopygus and Lutzomyia. Serra dos Carajás, located in southeastern Pará, is widely exploited by extractive companies and as a result, the LTA would be transformed into a major health problem to workers because of the practice of deforestation and construction of roads for drainage of the ore. The purpose of this study is to evaluate the natural infection in the sand fly by Leishmania in the Serra dos Carajás region through the PCR. Catches of sandflies were held in three different areas, Parque Zoobotânico de Quarentena, APA do Gelado and Tapirapé-Aquirí, with CDC-type of light traps and Shannon, during the night from the evening twilight. The sand flies captured were identified according to Young & Duncan, 1994, and frozen in N2. 5.947 sandflies were frozen, being 3.495 females and among these 550 specimens were tested. The extraction of DNA was performed using SDS and KOAc and it was precipitated with ethanol 96%. Subsequently, the PCR was performed by amplifying the mini-exon gene with the primers S1629 (5' GGGAATTCAATAWAGTACAGAAACTG 3') and S1630 (5' GGGAAGCTTCTGTACTWTATTGGTA 3'). The DNA of Leishmania was detected in 36 (6,5%) sand flies, 34 of subgenus Viannia detected in 30 Psychodopygus wellcomei/ complexus, three Lutzomyia whitmani and a Lutzomyia shawi. Two infections by Leishmania amazonensis was detected in Psychodopygus wellcomei/ complexus. Tapirapé - Aquirí, APA do Gelado and Parque Zoobotânico de Quarentena showed high rates of natural infection in sand flies 6.54%, 5.96% and 7.92% respectively. Ps. wellcomei/complexus still presents as Leishmania vector that cause LTA. Studies on the power of vector species Lu. whitmani and Lu. shawi naturally infected by Leishmania in the Serra dos Carajás should be intensified, if these species may be acting in the cycle of transmission of LTA in Serra dos Carajás. Studies that best explain the variation of the prevalence of different sandflies species and knowledge of the rate of infections should be also intensified in Serra dos Carajás.
Acesso aberto (Open Access)
Imunoreatividade para os receptores de neurotrofinas P75NTR e TrkA na zona subventricular de ratos adultos após isquemia estriatal
(Universidade Federal do Pará, 2015-08-21) TAVARES, Patrycy Assis Noronha; LIMA, Rafael Rodrigues; http://lattes.cnpq.br/3512648574555468; LEAL, Walace Gomes; http://lattes.cnpq.br/2085871005197072
Neurotrophins are growth factors expressed by cells of the nervous system both during development and in adulthood. The Nerve Growth Factor (NGF, the English- Nerve Growth Factor), brain-derived neurotrophic factor (English- BDNF- of Brain-Derived Neurotrophic Factor), Neurotrophin-3 (NT-3), Neurotrophin-4/5 ( NT-4/5), have many functions related to aging and response of nervous tissue to the pathology such as vascular accident (CVA). In this pathology, the increase of the neurotrophin expression can interfere with the degree of neurogenesis in the sub-ventricular zone (SVZ) and redirect the rostral migratory flow of Adult Neural Stem Cells (CTNAs) to the ischemic region. The presence of neurotrophin receptors TrkA and p75NTR in the CTNAs of SVZ indicates that they may participate in the regulation of neurogenesis in this region. Here we describe the influence of an experimental ischemia by microinjection of a vasconstritor Endothelin-1 peptide, which is restricted to the striatum adjacent SVZ; on the pattern of immunoreactivity for TrkA and p75NTR receptors in different survival times. The histopathological pattern of ischemic striatum and the cytoarchitecture of the SVZ, followed by immunohistochemical analysis to the receptors were analyzed. Numerous p75NTR + cells were found in the ipsilateral SVZ and against the injection site, with had a reduction in immunoreactivity at first and third day after ischemia. Few TrkA + cells were found in SVZ of both groups, however, many TrkA + axonal terminals were saw in the ischemic ipsilateral SVZ. Soon after the ischemic process, there was thickening of the SVZ, the concomitant reduction in immunoreactivity for p75NTR and TrkA + arisings of axonal terminals.
Acesso aberto (Open Access)
Isolamento e cultivo in vitro do agente etiológico da Doença de Jorge Lobo: morfologia, fisiologia e genoma de Candida loboi sp. nov
(Universidade Federal do Pará, 2015-12-18) COSTA, Patricia Fagundes da; SALGADO, Claudio Guedes; http://lattes.cnpq.br/2310734509396125
Jorge Lobo’s disease is a chronic granulomatous infection developing after traumatic implantation of the fungus in the skin. It presents with nodular, verrucous or keloid-like lesions mainly on legs and ears. The highest prevalence is at Amazon Region and it has been considered an emergent disease, presenting new cases on other continents in both, humans and dolphins. Little is known about L. loboi, and the absence of in vitro culture impairs the correct characterization of the fungus. This work had as the main goal to isolate, culture and characterize strains of the etiological agent of Jorge Lobo´s disease, obtained from patients attended at the Dr Marcello Candia Reference Unit in Sanitary Dermatology of the State of Pará, in Marituba, Pará, Brazil. During many years 23 patients were diagnosed and followed by our team. Most of them were male farmers, with age varying from 14 to 80 years-old. After biopsy of the lesion for confirming the diagnosis, the patients initiated treatment and the material was processed with dispase II at liquid medium RPMI, 37º C, 5% CO2 for 1-2 weeks to isolate yeast cells from human tissue. After 2-6 months in the medium, we observed fragmentation of mother cells and the presence of new yeast cells with diameter varying from 1 to 7μm. From that moment, it was possible to grow the strains in different liquid or solid mediums at 37º C or RT, where creamy, whitish cerebriform, sometimes hairy colonies were observed. Cells from those strains were analyzed by different techniques of optical and electron microscopy, biochemistry and genetics, ending with the description of the genome of one patient just after isolation of the fungal cells from the lesional skin, defining the following taxonomic identification: Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes; Saccharomycetales; Debaryomycetaceae; Candida/Lodderomyces clade; Candida; Candida sp. LDI48194. The peculiar clinical presentation associated to unique morphological, physiological and genetic characteristics that do not permit the definition of a known species indicate that the etiological agent of Jorge Lobo’s disease is a new species, for which we propose to use the name Candida loboi.