657 research outputs found
FrequĂȘncia de infecção por Tritrichomonas foetus (RIEDMULLER, 1928) em bovinos leiteiros do municĂpio de SanharĂł - PE
A tricomonose bovina Ă© uma enfermidade sexualmente transmissĂvel e infecciosa causada pelo protozoĂĄrio Tritrichomonas foetus RIEDMULLER, 1928), caracterizada por alteraçÔes reprodutivas nas fĂȘmeas tais como: incidĂȘncia de abortamentos, baixos Ăndices de fertilidade, aumento nos intervalos entre partos. Os machos sĂŁo assintomĂĄticos podendo atuar como fonte de infecção durante toda vida reprodutiva. Objetivou-se neste trabalho determinar a freqĂŒĂȘncia da tricomonose bovina em bovinos leiteiros do municĂpio de SanharĂł - PE. Foram utilizados 150 vacas e sete touros, mestiços zebu-holandĂȘs, com trĂȘs repetiçÔes de coleta para cada macho. Aos materiais coletados de machos e fĂȘmeas, lavado prepucial e muco cĂ©rvico-vaginal, respectivamente, foram adicionados meios de transporte e cultivo de T. foetus, o Lactopep e o Caldo Trichomonas. Passado o perĂodo de mĂnimo de 48 horas apĂłs a coleta, este material foi submetido Ă centrifugação, preparando-se, em seguida, as lĂąminas, as quais foram examinadas com auxĂlio de microscĂłpio Ăłptico em objetiva de 10X, 40X e 100X. O critĂ©rio para a consideração da positividade foi a presença de pelo menos um protozoĂĄrio na amostra examinada. O parasito nĂŁo foi observado em nenhuma das 150 amostras coletadas das fĂȘmeas, bem como nas 21 coletadas dos machos, indicando negatividade para T. foetus no rebanho estudado
Role of HIF-1α and CASPASE-3 in cystogenesis of odontogenic cysts and tumors
OBJECTIVES: Odontogenic cysts and tumors are the most relevant lesions that affect the gnathic bones. These lesions have in common the formation of cystic areas and this common feature may suggest involvement of similar mechanisms. The hypoxia inducible factor 1 alpha (HIF-1α), a responsive protein to hypoxia and caspase-3, an irreversible apoptosis marker, may contribute to cyst formation. Thus, this study aimed to investigate the immunoexpression of these proteins in odontogenic cysts and tumors. MATERIAL AND METHODS: Twenty cases of ameloblastoma, keratocystic odontogenic tumor (KOT) (n = 20), radicular cyst (RC) (n = 18), dentigerous cyst (DC) (n = 11), calcifying cystic odontogenic tumor (n = 8), and dental follicle (DF) (n = 10) were used to investigate HIF-1α and caspase-3 expression in sequential serial cuts by immunohistochemistry. RESULTS: HIF-1α was overexpressed in RC, DC, and ameloblastoma when compared with DF. The basal and sometimes the lower suprabasal layer showed no or very low expression in DC, KOT, and ameloblastoma, the last also showing strong expression in solid epithelial areas and initial cystic formation regions. Caspase-3 was found to be overexpressed in all lesions, with the highest expression in odontogenic cysts compared to tumors. HIF-1α and caspase-3 were localized in similar areas of the same lesions, especially in the epithelium surrounding cystic formations. CONCLUSIONS: This study showed distinct immunoexpression of HIF-1α and caspase-3 in odontogenic cyst and tumors, with higher expression observed in odontogenic cysts. CLINICAL RELEVANCE: These findings suggest a possible correlation between hypoxia, apoptosis, and cystogenesis, leading to understand the mechanisms responsible to cystic formation in odontogenic lesions
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