Molecular Identification and Characterization of Ileal and Cecal Fungus Communities in Broilers Given Probiotics, Specific Essential Oil Blends, and Under Mixed Eimeria Infection

Broiler digestive tract fungal communities have gained far less scrutiny than that given corresponding bacterial communities. Attention given poultry-associated fungi have focused primarily on feed-associated toxin-producers, yeast, and yeast products. The current project focused on the use of pyrosequencing and denaturing gradient gel electrophoresis (DGGE) to identify and monitor broiler digestive fungal communities. Eight different treatments were included. Four controls were an Uninfected-Unmedicated Control, an Unmedicated-Infected Control, the antibiotic bacitracin methylene disalicylate plus the ionophore monensin as Positive Control, and the ionophore monensin alone as a Negative Control. Four treatments were two probiotics (BC-30 and Calsporin) and two specific essential oil blends (Crina Poultry Plus and Crina Poultry AF). All chickens except the Unmedicated-Uninfected Control were given, at 15 days of age, a standard oral Eimeria inoculum of sporulated oocysts. Ileal and cecal digesta were collected at pre-Eimeria infection at 14 days of age and at 7 days post-Eimeria infection at 22 days of age. Extracted cecal DNA was analyzed by pyrosequencing to examine the impact of diet supplements and Eimeria infection on individual constituents in the fungal community, while DGGE was used to compare more qualitative changes in ileal and cecal communities. Pyrosequencing identified three phyla, seven classes, eight orders, 13 families, 17 genera, and 23 fungal species. Ileal and cecal DGGE patterns showed fungal communities were clustered mainly into pre- and post-infection patterns. Post-infection Unmedicated-Uninfected patterns were clustered with pre-infection groups demonstrating a strong effect of Eimeria infection on digestive fungal populations. These combined techniques offered added versatility towards unraveling the effects of enteropathogen infection and performance enhancing feed additives on broiler digestive microflora.

POLYPHENOLOXIDASE FROM ATEMOYA FRUIT (ANNONA CHERIMOLA MILL. ANNONA SQUAMOSA L.)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Enzymatic Hydrolysis of Sweet Lupin, Chickpea, and Lentil 11S Globulins Decreases their Antigenic Activity

We investigated the effects of treatments with the enzymes pepsin and trypsin on the in vitro immunological reactivity of the major globulins found in the seeds of sweet lupin, chickpea, and lentil. Polyclonal major globulin-specific antiserum was obtained by immunization of rabbits with a solution of the 11 S globulin of each legume. The globulins were hydrolyzed with pepsin and trypsin for 1, 5, 15, and 30 min. The native globulins and their hydrolysates were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting to identify the polypeptide bands with antigenic activity, and the hypoantigenicity of the hydrolysates was analyzed by enzyme-linked immunosorbent assay. Our results show that enzymatic treatment of the major storage protein (11 S globulin) of sweet lupin, chickpea, and lentil with pepsin or trypsin lead to the formation of large amounts of short peptides and free amino acids that do not allow antibody binding, resulting in a weakened immunoreactivity.

Protein Hydrolysis by Immobilized and Stabilized Trypsin

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Isolation, solubility and in vitro hydrolysis of chickpea vicilin-like protein

The chickpea vicilin-like globulin was isolated and chromatographed on Sepharose CL-6B and Sephacryl S-300. The native globulin with a molecular weight of 140 kDa was resolved in Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) in seven polypeptide bands in the range of 12.4-67 kDa. The solubility profile of the protein in water and NaCl solutions was typical of a legume globulin. The purified vicilin-like globulin, native and heated, was hydrolyzed by pepsin, trypsin and chymotrypsin. The hydrolysis patterns indicated that the native vicilin-like protein was only partially degraded by the enzymes in comparison with casein. Heating increased its susceptibility to hydrolysis relative to the native form, for all the enzymes. However, the results obtained by the pH-drop method revealed that the in vitro digestibility of the vicilin-like protein was not altered by heating, while 11 S-like and total globulins suffered a small increase, indicating that the structural characteristics of storage globulins may be important factors limiting the protein digestion. (c) 2007 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.

Evaluation of four molecular typing Methodologies as tools for determining taxonomy relations and for identifying. species among Yersinia isolates

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

Production, purification and characterization of an extracellular inulinase from Kluyveromyces marxianus var. bulgaricus

The yeast Kluyveromyces marxianus var. bulgaricus produced large amounts of extracellular inulinase activity when grown on inulin, sucrose, fructose and glucose as carbon source, This protein has been purified to homogeneity by using successive DEAE-Trisacryl Plus and Superose 6 HR 10/30 columns. The purified enzyme showed a relative molecular weight of 57 kDa by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and 77 kDa by gel filtration in Superose 6 HR 10/30, Analysis by SDS-PAGE showed a unique polypeptide band with Coomassie Blue stain and nondenaturing PAGE of the purified enzyme obtained from media with different carbon sources showed the band, too, when stained for glucose oxidase activity, the optimal hydrolysis temperature for sucrose, raffinose and inulin was 55 degrees C and the optimal pH for sucrose was 4.75, the apparent K-m values for sucrose, raffinose and inulin are 4.58, 7.41 and 86.9 mg/ml, respectively, Thin layer chromatography showed that inulinase from K. marxianus var. bulgaricus was capable of hydrolyzing different substrates (sucrose, raffinose and inulin), releasing monosaccharides and oligosaccharides, the results obtained suggest the hypothesis that enzyme production was constitutive.

Structural and functional evidence that a B chromosome in the characid fish Astyanax scabripinnis is an isochromosome

Astyanax scabripinnis possesses a widespread polymorphism for metacentric B chromosomes as large as the largest chromosome pair in the A complement. on the basis of C-banding pattern, it was hypothesized that these B chromosomes are isochromosomes that have arisen by means of centromere misdivision and chromatid nondisjunction. In the present paper we test this hypothesis by analysing (i) the localization of a repetitive DNA sequence on both B chromosome arms, and (ii) synaptonemal complex formation, in order to test the functional homology of both arms. Genomic DNA digested with KpnI and analysed by gel electrophoresis showed fragments in a ladder-like pattern typical of tandemly repetitive DNA. These fragments were cloned and their tandem organization in the genome was confirmed. A 51-bp long consensus sequence, which was AT-rich (59%) and contained a variable region and two imperfect reverse sequences, was obtained. Fluorescence in situ hybridization (FISH) localized this repetitive DNA into noncentromeric constitutive heterochromatin which encompasses the terminal region of some acrocentric chromosomes, the NOR region, and interstitial polymorphic heterochromatin in chromosome 24. Most remarkably, tandem repeats were almost symmetrically placed in the two arms of the B chromosome, with the exception of two additional small clusters proximally located on the slightly longer arm. Synaptonemal complex (SC) analysis showed 26 completely paired SCs in males with 1B. The ring configuration of the B univalent persisting until metaphase I suggests that the two arms formed chiasmata. All these data provided strong support for the hypothesis that the B chromosome is an isochromosome.

Invasion of epithelial mammalian cells by Paracoccidioides brasiliensis leads to cytoskeletal rearrangement and apoptosis of the host cell

Paracoccidioides brasiliensis (Pb) yeast cells can enter mammalian cells and probably manipulate the host cell environment to favor their own growth and survival. We studied the uptake of strain Pb 18 into A549 lung and Vero epithelial cells, with an emphasis on the repercussions in the cytoskeleton and the apoptosis of host cells. Cytoskeleton components of the host cells, such as actin and tubulin, were involved in the P. brasiliensis invasion process. Cytochalasin D and colchicine treatment substantially reduced invasion, indicating the functional participation of microfilaments (MFs) and microtubules (MTs) in this mechanism. Cytokeratin could also play a role in the P. brasiliensis interaction with the host. Gp43 was recognized by anti-actin and anti-cytokeratin antibodies, but not by anti-tubulin. The apoptosis induced by this fungus in infected epithelial cells was demonstrated by various techniques: TUNEL, DNA fragmentation and Bak and Bcl-2 immunocytochemical expression. DNA fragmentation was observed in infected cells but not in uninfected ones, by both TUNEL and gel electrophoresis methods. Moreover, Bcl-2 and Bak did not show any differences until 24 h after infection of cells, suggesting a competitive mechanism that allows persistence of infection. Overexpression of Bak was observed after 48 h, indicating the loss of competition between death and survival signals. In conclusion, the mechanisms of invasion of host cells, persistence within them, and the subsequent induction of apoptosis of such cells may explain the efficient dissemination of P. brasiliensis. (C) 2004 Published by Elsevier SAS.

Production of Trichophyton mentagrophytes antigens and their characterization in mice

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

Análise molecular dos éxons 8 a 11 do gene da p53 em amostras de câncer de colo de útero no Rio Grande do Norte

Mutations on TP53 gene are common in human cancer but not in cervical cancer where they are rarely found and the inactivation and degradation of p53 protein are attributed to the action of E6 viral oncogene from high risk human papillomavirus (HPV). Analysis of cervical cancer cell lines suggests that HPV negative samples shows mutation on TP53, but clinical approaches didn t confirmed this hypothesis. However, in most TP53 mutations studies on cervical cancer, only the exons 5 to 8 were analyzed. Approximately 90% of mutations described are on this region. Recent studies on several cancer suggests that mutation frequency in the other exons must be considered. The aim of this work was to verify whether mutations on coding and non-coding regions occur in cancer tissue from cervical cancer in patients from Rio Grande do Norte using Denaturing Gradient Gel Electrophoresis (DGGE) as screening tool. Exons 8 to 11 were analyzed including some introns from 80 tumor samples and 8 peripheral blood samples from healthy women. DNA were submitted to PCR using primers with GC clamp on the end of one of them. The results were observed for each region after DGGE and silver staining. It was observed no amplified fragment with different migration profile from those obtained from DNA of peripheral blood. These results agree with those from literature where TP53 mutations in cervical cancer have been described in a very low frequency

Characterization of excretory/secretory antigen from Toxocara vitulorum larvae

Toxocara vitulorum is a nematode parasite of the small intestine of cattle and water buffalo, particularly buffalo calves between one and three months of age, causing high morbidity and mortality. The purpose of this research was to characterize the excretory/secretory (ES) antigens of T vitulorum larvae by SDS-polyacrylamide gel electrophoresis (PAGE) and Western blot (WB), using immune sera and colostrum of buffalo naturally infected by T vitulorum. The parasitological status of the buffalo calves was also evaluated using sequential fecal examinations. The results showed that the ES antigen revealed eight (190, 150, 110, 90, 64, 56, 48, and 19 kDa) protein bands by SDS-PAGE. The majority of these bands were recognized in the sera and colostrum of infected buffalo with T vitulorum when analyzed by WB. However, particularly fractions of high molecular weight (190, 150, 110, and 90 kDa) were represented in more prominent bands and persisted in the groups of buffalo calves at the peak of egg output, as well as during the period of rejection of T vitulorum by the feces of the calves. During the period of post-rejection of the worms (between the day 118 and 210 of age) the serum antibodies did not react with any protein bands. on the other hand, sera from buffalo calves at one day of age (after suckling the colostrum and at the beginning of infection) reacted with the same bands detected in the serum and colostrum of the buffalo cows.

Clastogenicity of Piper cubeba (Piperaceae) seed extract in an in vivo mammalian cell system

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Absence of mutagenicity effects of Psidium cattleyanum Sabine (Myrtaceae) extract on peripheral blood and bone marrow cells of mice

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Lack of clastogenic/genotoxic effects of Baccharis dracunculifolia extract on Swiss mouse peripheral blood cells

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