Análise da expressão gênica de pequenos RNAs derivados de tRNAs (tRFs) em plantas

Small non coding RNAs emerged as important characters in several biology aspects. Among then, the most studied are microRNAs (miRNAs) and short interfering RNAs (siRNAs), that regulate their target gene post-transcriptionally in plants, animals and RNAi pathway intermediates, respectively. Both of classes have similar biogenesis being processed by Dicer enzymes and subsequent association with Argonaute enzymes. In plants, miRNAs and siRNAs have important functions in development, genome integrity and biotic and abiotic stress responses. The advances in high-throughtput sequencing and in silico analisys provide the uncover of new small non coding RNAs classes, many of them with unknown functions and biogenesis. tRNA derived small RNAs (tRFs) are a small non coding RNA class, that have as precursor a tRNA molecule. These were uncovers in the last decade in many organisms and, recently, in plants. Recent works detected tRFs from different sizes, with different source portions of the mature tRNA molecule (5’ end; 3’ end, anti-codon loop) and some from the tRNA precursor (pre-tRNA), suggesting that may be a novel class of small RNA and not random degradation products. Works in humans showed that some tRFs are processed by the Dicer enzymes, have association with the Argonaute enzymes and cell differentiation, tumor appearance and gene silencing related functions. Works in Arabidopsis and pumpkin (Cucurbita maxima) showed, respectively, that the tRFs have nutritional stress response possible functions and long distance signaling function between source and drain tissues, and may affect the translation. The tRFs biogenesis in plants are, until now an unknown, absence information about it in the literature and its possible biological functions are few studied yet, making then interesting target for studies among the small non coding RNAs in plants

Efeitos de diferentes fontes de gordura alimentar na resposta a aspiração folicular de cabras anglo-nubianas

Pós-graduação em Medicina Veterinária - FCAV

Expressão gênica de células do cumulus e oócitos bovinos sbmetidos à maturação un vitro com diferentes macromoléculas, EGF e Butirolactina I

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Habilidades sociais, competência acadêmica e problemas de comportamento em crianças com diferentes níveis de plumbemia

Este estudo teve como objetivo verificar a relação entre diferentes níveis de plumbemia e o repertório de habilidades sociais, problemas de comportamento e competência acadêmica de crianças e adolescentes. Participaram 155 crianças e adolescentes, com idade média de 13,10 anos, pertencentes a três grupos: alta plumbemia (superior a 10μg/dl), baixa plumbemia (inferior a 5μg/dl) e que viviam em ambiente similar, mas livre da contaminação por chumbo (grupo de comparação). Foram utilizados os instrumentos SSRS-BR e o IHSA-Del-Prette, respondidos pelos participantes e seus professores. Identificou-se comprometimento no repertório comportamental, acadêmico e social, associado ao nível de plumbemia. Esses resultados evidenciam os riscos associados à exposição ao chumbo. São discutidas explicações para alguns resultados contraditórios, levantando-se hipóteses e questões para novos estudos.

CD95 (FAS) and CD178 (FASL) induce the apoptosis of CD4+ and CD8+ cells isolated from the peripheral blood and spleen of dogs naturally infected with Leishmania spp

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Pathology and virus tissue distribution of Turkey Coronavirus (TCoV) in experimentally infected chicks and turkey poults

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Penectomia em equino com carcinoma de células escamosas

The presence of increased volume in penis and prepuce of horses can be of neoplastic or non-neoplastic origin. Squamous cell carcinoma (SCC), papilloma, fibropapiloma, melanoma and sarcoidorigin. Squamous cell carcinoma (SCC), papilloma, fibropapilloma, melanoma and sarcoid are detached as neoplastic causes. The non-neoplastic causes can be parasitic as habronemiasis and pythiosis, or inflammation, resulting in the formation of exuberant granulation tissue. The penile disorders can be easily confused with each other because they have similar clinical signs. Among epithelial neoplasms affecting penis and prepuce, squamous cell carcinoma is the most common in horses. Thus, it was aimed to report a case of squamous cell carcinoma in a horse and describe the main differential diagnosis for this disease. The additional tests to obtain an accurate diagnosis and the institution of appropriate treatment are essential for the satisfactory repair of penile neoplasms in this species.

O papel da angiogênese e da hemólise na úlcera de perna de pessoas com anemia falciforme

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Differential Expression of ADAM23, CDKN2A (P16), MMP14 and VIM Associated with Giant Cell Tumor of Bone

Though benign, giant cell tumor of bone (GCTB) can become aggressive and can exhibit a high mitotic rate, necrosis and rarely vascular invasion and metastasis. GCTB has unique histologic characteristics, a high rate of multinucleated cells, a variable and unpredictable growth potential and uncertain biological behavior. In this study, we sought to identify genes differentially expressed in GCTB, thus building a molecular profile of this tumor. We performed quantitative real-time polymerase chain reaction (qPCR), immunohistochemistry and analyses of methylation to identify genes that are putatively associated with GCTB. The expression of the ADAM23 and CDKN2A genes was decreased in GCTB samples compared to normal bone tissue, measured by qPCR. Additionally, a high hypermethylation frequency of the promoter regions of ADAM23 and CDKN2A in GCTB was observed. The expression of the MAP2K3, MMP14, TIMP2 and VIM genes was significantly higher in GCTB than in normal bone tissue, a fact that was confirmed by qPCR and immunohistochemistry. The set of genes identified here furthers our understanding of the molecular basis of GCTB.

Dendritic cell are able to differentially recognize Sporothrix schenckii antigens and promote Th1/Th17 response in vitro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Subpopulations of mononuclear leukocytes associated with inhibition of Ehrlich ascites tumor growth by treatment with Bothrops jararaca venom

Snake venoms have been used as antineoplastic substances in several experimental models. We demonstrated in previous studies that Bothrops jararaca venom (BjV) induces inhibition of Ehrlich ascites tumor ( EAT) growth accompanied by an increase of mononuclear (MN) leukocytes in all groups inoculated with EAT and/or venom. The objective of the present study was to characterize the subpopulations of MN leukocytes involved in the inhibition of EAT growth by treatment with BjV. Swiss mice were inoculated with 1.0 x 10(3) EAT cells by the intraperitoneal route and treated with 0.4 mg/kg of BjV by the same route ( Group TV). Treatment was started 24 h after tumor cell inoculation and consisted of five intraperitoneal injections performed at 72 h intervals. After 2, 8 and 14 days, groups of animals were sacrificed and the number of B, TCD4 and TCD8 lymphocytes, macrophages and natural killer cells present in the peritoneal cavity was determined by flow cytometry. The control group consisted of animals inoculated with EAT and treated with 0.1 ml of saline under the same conditions as the experimental group ( Group T). Two additional control groups consisted of animals not inoculated with EAT and treated with saline or venom. Data were analyzed statistically by the Kruskal - Wallis nonparametric test for independent samples. on the 2nd and 8th day we observed a difference between groups T and TV ( group T > group TV) for all cell types, except natural killer cells, that only differed on the 2nd day. However, on the 14th day there was no difference in MN cells among groups. These data suggest that the inhibition of EAT is related to the toxic action of BjV on tumor cells and/or to the proteolytic effect of the venom on the mediators produced by the cells for growth modulation.

Cell-free antigens from precocious Paracoccidioides brasiliensis culture induce a typical delayed-type hypersensitivity reaction

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

DNA methylation patterns in bladder cancer and washing cell sediments: a perspective for tumor recurrence detection

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

HLA-G polymorphism and transitional cell carcinoma of the bladder in a Brazilian population

The morphologic appearance and clinical behavior of the human urinary bladder papillary transitional cell carcinoma (TCC) probably result from a complex interaction between carcinogenic insults and host resistance during the patient's life. While the main recognized risk factors are of environmental origin (e.g. smoking), relatively little information exists about the susceptibility to TCC development. The human leukocyte antigen G (HLA-G) molecule plays an important role in immune response regulation and has been implicated in the inhibition of the cytolytic function of natural killer and cytotoxic T cells. Several lines of evidence indicate that HLA-G polymorphisms influence the expression level and production of different HLA-G isoforms. The aim of this study was to explore a possible influence of the HLA-G polymorphism on the susceptibility to urinary bladder TCC development and progression in smokers and nonsmokers Brazilian subjects. The HLA-G locus was found to be associated with susceptibility to TCC development and progression. The G*0104 allelic group (specially the G*010404 allele) and the G*0103 allele were associated with a tobacco-dependent influence on TCC development. The G*0104 group was associated with progression to high-grade tumors, irrespective of smoking habit, while the G*0103 allele was associated to high-grade tumor only in smoking patients. Our results are an evidence that the HLA-G locus itself, or as part of an extended haplotype encompassing this chromosome region (particularly the HLA-A given the high linkage disequilibrium observed between them in this data series), may be associated with TCC susceptibility and tumor progression, suggesting a tobacco-dependent influence of these polymorphisms.