RESUMO
Considering the lack of consensus related to the impact of selective IL-6 receptor inhibition on bone remodeling and the scarcity of reports, especially on large bone defects, this study proposed to evaluate the biological impact of the selective inhibitor of interleukin-6 receptor (tocilizumab) in an experimental model of critical calvarial defect in rats. In this preclinical and in vivo study, 24 male Wistar rats were randomly divided into two groups (n=12/group): defect treated with collagen sponge (CG) and defect treated with collagen sponge associated with 2 mg/kg tocilizumab (TCZ). The defect in the parietal bone was created using an 8-mm diameter trephine drill. After 90 days, the animals were euthanized, and tissue samples (skull caps) were evaluated through micro-CT, histological, immunohistochemistry, cytokines, and RT-qPCR analyses. Tocilizumab reduced mononuclear inflammatory infiltration (P<0.05) and tumor necrosis factor (TNF)-α levels (P<0.01) and down-regulated tissue gene expression of BMP-2 (P<0.001), RUNX-2 (P<0.05), and interleukin (IL)-6 (P<0.05). Moreover, it promoted a stronger immunostaining of cathepsin and RANKL (P<0.05). Micro-CT and histological analyses revealed no impact on general bone formation (P>0.05). The bone cells (osteoblasts, osteoclasts, and osteocytes) in the defect area were similar in both groups (P>0.05). Tocilizumab reduced inflammatory cytokines, decreased osteogenic protein, and increased proteases in a critical bone defect in rats. Ninety days after the local application of tocilizumab in the cranial defect, we did not find a significant formation of bone tissue compared with a collagen sponge.
RESUMO
BACKGROUND: Actinic cheilitis is a potentially malignant lesion most commonly found in the lower lip of individuals with chronic exposure to ultraviolet radiation. The aim of this study was to develop and to test a clinical index that can be used to assess the severity of actinic cheilitis. MATERIAL AND METHODS: The clinical index of actinic cheilitis was applied to 36 patients. An incisional biopsy was obtained to grade oral epithelial dysplasias following the World Health Organization (WHO) and binary systems, and to evaluate their association with clinical characteristics by Fisher's exact test (P<0.05). The accuracy of the index was evaluated based on sensitivity, specificity, positive and negative predictive values, and receiver operating curve. RESULTS: The blurring between the border of the lip and the skin was significantly associated with cases without dysplasia/mild epithelial dysplasia (P=0.041) and with low risk of malignancy (P=0.005). Ulcers and crusts were significantly associated with moderate/severe epithelial dysplasia (P=0.002 and P=0.012, respectively) and high risk of malignancy (P=0.005 and P=0.045, respectively). Erosion showed a significant association only with high-risk cases of malignancy (P=0.024). The cut-off values of the diagnostic test showing the best performance were 10 for the WHO grading system and 11 for the binary system. CONCLUSIONS: The index cut-offs with the highest accuracy were considered indicators for a biopsy. Erosion, ulceration and crusts were associated with more severe oral epithelial dysplasias.
Assuntos
Queilite , Neoplasias Labiais , Queilite/diagnóstico , Queilite/etiologia , Queilite/patologia , Humanos , Hiperplasia/patologia , Lábio/patologia , Neoplasias Labiais/diagnóstico , Raios UltravioletaAssuntos
Carcinogênese/metabolismo , Carcinoma de Células Escamosas/metabolismo , Queilite/metabolismo , Ciclo-Oxigenase 2/metabolismo , Neoplasias Labiais/metabolismo , Adulto , Carcinogênese/patologia , Carcinoma de Células Escamosas/patologia , Queilite/patologia , Feminino , Humanos , Neoplasias Labiais/patologia , Metástase Linfática , Masculino , Gradação de Tumores , Estadiamento de NeoplasiasRESUMO
High hydrostatic pressure is an alternative to thermal processing to inactivate spoilage and pathogenic microorganisms. Cashew apple juice has a pleasant flavor and is rich in vitamin C. Studies to determine the effect of high pressure on microorganisms in cashew apple juice are still lacking. In this study, the inactivation of natural micropopulation and inoculated Escherichia coli by high pressure was evaluated in fresh cashew apple juice. The microbiological stability of pressure-treated juice was also evaluated. The applied high pressure levels ranged from 250 to 400 MPa for periods of 3 to 7 min. Treatments with 350 MPa for 7 min and 400 MPa for either 3 or 7 min reduced the aerobic mesophilic bacteria count to a level below the detection limit. Pressure treatments were also efficient in inactivating yeast and filamentous fungi. The inoculated E. coli (10(6) CFU/mL) was reduced to below 10 CFU/mL after a pressure treatment of 400 MPa for 3 min. The inactivation of this microorganism followed a 1st-order reaction kinetics. The decimal reduction time (D-value) ranged from 1.21 to 16.43 min, while pressure resistance value (z-value) was 123.46 MPa. Neither natural micropopulation growth nor E. coli repair was observed in postprocessed (400 MPa for 3 min) cashew apple juice kept under refrigerated storage (at 4 degrees C) during 8 wk. The results of this study demonstrated the efficacy of high-pressure treatment for preserving cashew apple juice.
Assuntos
Anacardium/microbiologia , Bactérias/crescimento & desenvolvimento , Bebidas/microbiologia , Conservação de Alimentos/métodos , Fungos/crescimento & desenvolvimento , Pressão Hidrostática , Contagem de Colônia Microbiana , Contaminação de Alimentos/análise , Manipulação de Alimentos/métodos , Microbiologia de Alimentos , Cinética , Fatores de TempoRESUMO
Em um ensaio duplo-cego, estudou-se o efeito redutor do uso de corticosteróide do diclofenaco sódico em 95 pacientes portadores de artrite reumatóide clássica ou definida, segundo critérios da ARA, tratados com doses variáveis de prednisolona, iguais ou superiores a 7,5mg/dia, associada ao diclofenaco sódico 50mg três vezes ao dia, ou a placebo, durante oito semanas. Observou-se melhora em ambos os grupos, segundo todos os parâmetros de eficácia terapêutica. Houve, no entanto, maior reduçäo da severidade da dor ao movimento, da duraçäo da rigidez matinal e da sensibilidade articular no grupo tratado com o diclofenaco (p<0,05). A tolerabilidade foi boa nos dois grupos de tratamento, sendo a maioria dos efeitos colaterais de natureza gastrointestinal. A dose diária de prednisolona pôde ser reduzida em 3mg no grupo tratado com o diclofenaco, permanecendo inalterada no grupo placebo. Essa diferença é estatisticamente significativa (p<0,01)
Assuntos
Adulto , Humanos , Masculino , Feminino , Artrite Reumatoide/tratamento farmacológico , Diclofenaco/uso terapêutico , Prednisolona/uso terapêutico , Quimioterapia CombinadaRESUMO
The role of wild, forest animals as reservoirs of Leptospira was investigated in Pará State, north Brazil. 696 animals were examined by culture of kidney tissue; isolates of serovar ballum were made from the rodent Proechimys sp. and the opossum Didelphis marsupialis; leptospires of the serogroups hebdomadis, grippotyphosa and cynopteri were isolated from the armadillo Dasypus novemcinctus, and as yet untyped leptospires were isolated from Proechimys and the procyonid carnivore Nasua nasua. Antibodies to serovars bataviae, butembo, canicola, castellonis, celledoni, grippotyphosa, panama, icterohaemorrhagiae and wolffi were demonstrated among 222 other animals examined by serological methods.