PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Xavier D.B., Rosa A.H., Sena H.S., Teixeira D.S., Tomaz C. & Titze-de-Almeida R. 2010. Absence of intestinal colonization by vancomycin-resistant enterococci in nonhuman primates. Pesquisa Veterinária Brasileira 30(6):491-496. Microbiologia Molecular e Biotecnologia, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Cx. Postal 04508, Brasília, DF 70910-900, Brazil. E-mail: ricardo.titze@hotmail.com The animal reservoirs of vancomycin-resistant enterococci (VRE) have important role in the epidemiology of the bacteria and resistant genes. The present work searched fecal samples taken off nonhuman primates for the presence of VRE. Resistance profiles, virulence traits, and genetic variability among enterococci isolates were also analyzed. The samples included Capuchin monkeys (Cebus apella, n=28) and Common marmoset (Callithrix penicillata, n=37) housed in the Primate Center of the University of Brasília, Brazil. Most individuals were captive monkeys from the Central-West and South-East regions of Brazil (n=48). We collected rectal swabs and carried out selective isolation followed by multiplex Polymerase Chain Reaction (PCR) to identify species and resistance genes. No vanA or vanB-containing enterococci were found. The carriage rates ranged from 1.5% for the VanC-type E. casseliflavus and E. gallinarum until 12.3% (n=8) for Enterococcus faecalis. All E. faecalis isolates showed susceptibility to vancomycin, teicoplanin, ampicillin, gentamicin, and streptomycin. The virulence genes ace and esp were prevalent (100.0%, 87.5%). Multilocus variable number of tandem repeats (MLVA) revealed diversity in the number of repeats among E. faecalis isolates and targets, which was higher for espC, efa5, and efa6. We identified six different MLVA genotypes that were divergent from those described in human beings. Also, they were clustered into two genogroups that showed host-specificity for the species Cebus apella or Callithrix penicillata. In conclusion, no vanA- or vanB-containing enterococci were found colonizing those primate individuals. This finding suggested that the primate individuals investigated in our study are not directly involved in the epidemiological chain of high-level vancomycin-resistant genes vanA or vanB in Brazil. Our study also showed that E. faecalis isolated from nonhuman primates carry virulence traits and have ability to spread their lineages among different individuals.

• Enterococcus vancomycin-resistance monkey vancomicina macacos

Abstract in Portuguese:

RESUMO.- Xavier D.B., Rosa A.H., Sena H.S., Teixeira D.S., Tomaz C. & Titze-de-Almeida R. 2010. Absence of intestinal colonization by vancomycin-resistant enterococci in nonhuman primates. [Ausência de enterococos resistentes à vancomicina na microbiota intestinal de primatas não-humanos.] Pesquisa Veterinária Brasileira 30(6):491-496. Microbiologia Molecular e Biotecnologia, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Cx. Postal 04508, Brasília, DF 70910-900, Brazil. E-mail: ricardo.titze@hotmail.com Os reservatórios animais de Enterococos Resistentes à Vancomicina (VRE) têm um importante papel na epidemiologia destas bactérias e dos respectivos genes de resistência. O presente estudo examinou a presença de VRE em amostras fecais obtidas de primatas não-humanos. Foram analisados os perfis de resistência, as características de virulência e a variabilidade genética dos isolados. A amostragem incluiu macacos Prego (Cebus apella, n=28) e Sagüis do cerrado (Callithrix penicillata, n=37) alojados no Centro de Primatologia da Universidade de Brasília, Brasil. A maioria dos indivíduos amostrados foram macacos apreendidos na região Centro-Oeste e Sudeste do Brasil (n=48). Assim, foram coletados swabs retais e realizado o isolamento seletivo, seguido da Reação de Polimerização em Cadeia (PCR) multiplex para identificar espécies e genes de resistência. Não foram isolados enterococos contendo os genes vanA ou vanB. A porcentagem de enterococos variou de 1,5% para E. casseliflavus e E. gallinarum VanC até 12,3% (n=8) para Enterococcus faecalis. A totalidade dos isolados da espécie E. faecalis demonstrou sensibilidade aos antimicrobianos vancomicina, teicoplanina, ampicilina, gentamicina e estreptomicina. Os genes de virulência ace e esp foram prevalentes (100%, 87.5%). A análise em multilocus de repetições em tandem de número variável (MLVA) revelou diversidade no número de repetições entre os isolados de E. faecalis, que foi mais alta para espC, efa5 e efa6. Foram identificados seis diferentes genotipos de MVLA, divergindo daqueles já descritos em humanos. Os genotipos foram ainda agrupados em dois genogrupos, demonstrando especificidade de hospedeiro para as espécies Cebus apella ou Callithrix penicillata. Concluindo, não foram isoladas linhagens de enterococos contendo os genes vanA ou vanB colonizando as espécies de primatas analisadas. O presente estudo demonstrou que os isolados de E. faecalis obtidos de primatas não-humanos apresentam determinantes de virulência e possuem a habilidade de disseminar linhagens entre diferentes indivíduos.

Abstract in English:

ABSTRACT.- Mello M.F.V., Pissinatti A. & Ferreira A.M.R. 2010. Distribution of collagen types I, III, and IV in gastric tissue of marmosets (Callithrix spp., Callitrichidae: Primates). Pesquisa Veterinária Brasileira 30(4):317-320. Departamento de Patologia e Clínica Veterinária, Faculdade de Veterinária, Universidade Federal Fluminense, Rua Vital Brasil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: marcelafvmello@hotmail.com Extracellular matrix (ECM) components such as fibrillar collagens play a fundamental role in wound repair and have also been studied in association with the gastric ulcer healing process in gastroenterology. Nevertheless, there have been no studies in the literature to date regarding the description and characterization of ECM components, neither in normal nor in injured gastric tissue of primate species. The objective of this study was to investigate the expression of gastric collagen types I, III, and IV in marmosets (Callithrix sp.). Histological specimens from the stomach of 6 Callithrix jacchus, 12 C. kuhli, and 12 C. geoffroyi were evaluated. The specimens were immunostained with anti-types I and III collagen polyclonal antibodies and anti-type IV collagen monoclonal antibody. Collagen types I and III were detected in the submucosa and lamina propria between the mucosal glands while collagen type IV was detected in the muscularis mucosae, muscular layers, blood vessels, and gastric mucosa between the mucosal glands. It is hoped that these findings can contribute to future studies on the gastric extracellular matrix components in primates and to comparative studies in the area of gastroenterology.

• Extracellular matrix collagen types I III and IV matriz extra-celular colágenos tipo I III e IV

Abstract in Portuguese:

RESUMO.- Mello M.F.V., Pissinatti A. & Ferreira A.M.R. 2010. Distribution of collagen types I, III, and IV in gastric tissue of marmosets (Callithrix spp., Callitrichidae: Primates). [Distribuição dos colágenos tipo I, III e IV em tecido gástrico de sagüis (Callithrix spp., Callitrichidae: Primates).] Pesquisa Veterinária Brasileira 30(4):317-320. Departamento de Patologia e Clínica Veterinária, Faculdade de Veterinária, Universidade Federal Fluminense, Rua Vital Brasil Filho 64, Niterói, RJ 24230-340, Brazil. E-mail: marcelafvmello@hotmail.com Os componentes da matriz extra-celular (MEC), como os colágenos fibrilares, desempenham um papel fundamental no reparo de feridas, tendo sido estudados em gastroenterologia, em associação com a cicatrização da úlcera gástrica. No entanto, não há estudos até o presente momento, que relatem a descrição e caracterização de componentes da MEC no tecido gástrico, quer seja normal ou com lesão, de espécies de primatas. O objetivo deste estudo foi investigar a expressão dos colágenos tipo I, III e IV no tecido gástrico de sagüis (Callithrix sp.). Foram avaliadas amostras do estômago de 6 Callithrix jacchus, 12 C. kuhli e 12 C. geoffroyi. As amostras foram submetidas à reação de imuno-histoquímica com anticorpos policlonais anti–colágenos tipo I e III e monoclonal anti-colágeno tipo IV. Os colágenos tipo I e III foram detectados na submucosa e na lâmina própria da mucosa, entre as glândulas gástricas, enquanto que o colágeno tipo IV foi detectado na muscularis mucosae, nas camadas musculares, nos vasos sanguíneos e na camada mucosa, entre as glândulas gástricas. Estes achados poderão contribuir com estudos futuros relacionados aos componentes da MEC no tecido gástrico de primatas e com estudos comparativos na área da gastroenterologia.

Abstract in English:

ABSTRACT.- Pissinatti T.A., Pissinatti A. & Burity C.H.F. 2007. Myocardial stereology in captive Callithrix kuhlii (Callitrichidae, Primates): healthy animals versus animals affected by wasting marmoset syndrome (WMS). Pesquisa Veterinária Brasileira 27(2):75-79. Setor de Morfologia, IBC, Universidade do Grande Rio (Unigranrio), Rua Prof. José de Souza Herdy 1160, uque de Caxias, RJ 25071-202, Brazil. E-mail: cburity@unigranrio.com.br This study comprised 12 hearts of Wied´s black-tufted-ear marmoset, Callithrix kuhlii (Coimbra-Filho 1985), 6 with Wasting Marmoset Syndrome (WMS) and 6 non-affected. Biometry was performed after death. After necropsy, the hearts were weighed, dissected, fixed in 10% formalin solution (pH 7.2), and processed for optical microscopy at 5µm sections stained with Haematoxylin-Eosin. Quantitative analysis was performed by stereological techniques. The statistical differences between the biometrical and stereological parameters were assessed by the Mann-Whitney test. The morphometric results showed that WMS causes a significant reduction in body and cardiac weights, and also in the volume density of vessels in those animals. Further studies are necessary to understand some of the results shown here.

• Wasting marmoset syndrome myocardium stereology Callithrix Callitrichidae

Abstract in Portuguese:

ABSTRACT.- Pissinatti T.A., Pissinatti A. & Burity C.H.F. 2007. Myocardial stereology in captive Callithrix kuhlii (Callitrichidae, Primates): healthy animals versus animals affected by wasting marmoset syndrome (WMS). Pesquisa Veterinária Brasileira 27(2):75-79. Setor de Morfologia, IBC, Universidade do Grande Rio (Unigranrio), Rua Prof. José de Souza Herdy 1160, uque de Caxias, RJ 25071-202, Brazil. E-mail: cburity@unigranrio.com.br This study comprised 12 hearts of Wied´s black-tufted-ear marmoset, Callithrix kuhlii (Coimbra-Filho 1985), 6 with Wasting Marmoset Syndrome (WMS) and 6 non-affected. Biometry was performed after death. After necropsy, the hearts were weighed, dissected, fixed in 10% formalin solution (pH 7.2), and processed for optical microscopy at 5µm sections stained with Haematoxylin-Eosin. Quantitative analysis was performed by stereological techniques. The statistical differences between the biometrical and stereological parameters were assessed by the Mann-Whitney test. The morphometric results showed that WMS causes a significant reduction in body and cardiac weights, and also in the volume density of vessels in those animals. Further studies are necessary to understand some of the results shown here.