Systemic bone marker expression induced by grey and white mineral trioxide aggregate in normal and diabetic conditions.

AIM: To investigate the relationship between diabetes mellitus and local/systemic effects of both grey and white mineral trioxide aggregate (MTA) Angelus on bone marker expression. METHODOLOGY: Wistar rats were divided into two groups: healthy and diabetic (Alloxan induced), which were further divided into three subgroups (control, GMTA Angelus and WMTA Angelus). Polyethylene tubes filled with MTA materials or empty tubes were implanted in dorsal connective tissue. On days 7 and 30, blood samples were collected for calcium, phosphorus and ALP measurement. The animals were euthanized; implanted tubes were removed and processed for immunohistochemical analysis of osteocalcin (OCN) and osteopontin (OPN). Kruskal-Wallis followed by Dunn's multiple comparison test was performed for nonparametric data, and anova followed by Tukey's test for parametric data. RESULTS: No difference in systemic serum calcium levels between both groups was observed. On day 7, serum phosphorus levels within the WMTA healthy group were higher than that of the diabetic group. On day 30, healthy rats exhibited lower phosphorus levels than diabetic ones. At both time points, the diabetic group was associated with more ALP activity than the healthy group. Immunohistochemical analyses of the healthy group revealed OCN- and OPN-positive cells in the presence of both MTA materials. However, under diabetic conditions, both OCN and OPN were absent. CONCLUSION: Both MTA materials were associated with an increase in serum calcium, phosphorus and ALP, suggesting a potential systemic effect, along with triggered differentiation of OCN- and OPN-positive cells. Moreover, in diabetic conditions, an inhibitory effect on MTA-induced differentiation of OCN- and OPN-positive cells was detected.

Resveratrol atenua o estresse oxidativo e a lesão muscular de ratos sedentários submetidos ao exercício físico / Resveratrol attenuates oxidative stress and muscle damage in sedentary rats subjected to physical exercise

O sedentarismo é um problema de saúde pública e um dos maiores males da sociedade moderna. Já está bem estabelecido que esforço físico em excesso ou em indivíduos não condicionados acarreta estresse oxidativo e lesões musculares. No presente estudo, foi testada a hipótese de que um único esforço físico é capaz de causar estresse oxidativo e lesão muscular em indivíduos sedentários. Aditivamente foi avaliado efeito antioxidante do polifenol resveratrol (RV) quanto a sua capacidade de atenuar o estresse oxidativo e a lesão muscular causados pelo esforço físico. Para tal, 40 ratos (Rattus norvegicus albinus, Wistar), machos, adultos e sedentários foram aleatoriamente submetidos ou não a 90 minutos de natação, com e sem tratamento com RV (100mg/kg/PV/14dias): N-RV- (n=10) grupo mantido em repouso e não tratado com RV; N-RV+ (n=10) grupo mantido em repouso e tratado com RV; N+RV- (n=10) grupo submetido ao esforço físico de natação e não tratado com RV e N+RV+ (n=10) grupo submetido ao esforço físico de natação e tratado com RV. Em ratos sedentários, o esforço físico da natação promoveu estresse oxidativo (aumento da peroxidação lipídica e diminuição da capacidade antioxidante total do plasma) e aumento significativo da atividade plasmática de creatina quinase (CK) e lactato desidrogenase (LDH). O tratamento com RV diminuiu a peroxidação lipídica e a concentração dos marcadores de lesão muscular (CK e LDH) de ratos sedentários submetidos à natação. Essa é uma das primeiras evidências de que um único esforço físico pode causar estresse oxidativo em indivíduos sedentários e que o RV pode ser uma alternativa para atenuar a lesão muscular causada por esse estresse.(AU)

Physical inactivity is a public health problem when a sedentary population practices physical activity sporadically. Exercise in unconditioned individuals causes oxidative stress and muscle damage. This study tested the hypothesis that a single physical exertion can cause muscle damage and oxidative stress in sedentary individuals, and resveratrol can attenuate it. For this, 40 sedentary adult male rats were equally and randomized into four groups subjected to 90min swimming or rest and administered aqueous resveratrol (100mg/kg/day) or saline for 14 days: N-RV-, rats maintained at rest and administered saline; N-RV+, rats maintained at rest and treated with resveratrol; N+RV-, rats subjected to physical exercise and administered saline; and N+RV+, rats subjected to physical exercise and treated with resveratrol. In sedentary rats, the physical exertion of swimming promoted oxidative stress, i.e. increased lipid peroxidation and decreased plasma total antioxidant capacity, and significant increases in CK and LDH plasma activities. Resveratrol diminished lipid peroxidation and the concentrations of muscle damage markers (CK and LDH) in sedentary rats subjected to swimming. The results provide evidence that a single sudden physical exertion can cause oxidative stress in sedentary rats. Resveratrol showed good results as a treatment for minimizing muscle damage caused by this stress.(AU)

Parâmetros hematológicos e perfil bioquímico renal de cordeiros nascidos a termo e prematuros / Hematologic parameters and renal biochemical profile in full-term and premature lambs

O objetivo do presente estudo foi avaliar as variáveis hematológicas e o perfil bioquímico renal sérico de cordeiros nascidos a termo e prematuros do nascimento às 48 horas de vida, bem como verificar a influência da dexametasona sobre tais variáveis. Foram constituídos quatros grupos experimentais: PN (cordeiros nascidos de parto normal, n=15, média de 146 dias); PNDEX (cordeiros nascidos de parto normal cujas mães receberam 16mg de dexametasona aos 141 de gestação, n=8, média de 143 dias); PRE (cordeiros prematuros nascidos de cesarianas aos 138 dias de gestação, n=10) e PREDEX (cordeiros prematuros nascidos de cesarianas aos 138 dias de gestação cujas mães receberam 16mg de dexametasona dois dias antes, n=9). Os valores médios do volume globular e de hemoglobina diminuíram ao longo das 48 horas de observação, nos quatro grupos experimentais, porém dentro dos limites fisiológicos para a espécie. Houve variação da concentração plasmática de proteínas totais em todos os momentos, sendo os menores valores no grupo PRE. A contagem leucocitária foi mais alta no grupo PN apenas no M24h. Ao longo do período, apenas o grupo PN mostrou diferença entre o M24h e os demais momentos, e o grupo PRE apresentou os menores valores de neutrófilos no M0h, M15min e M60min. As concentrações séricas de creatinina foram mais altas no grupo PRE no M60min, M24h e M48h. Em todos os grupos, houve diminuição no M24h e M48h. Os parâmetros avaliados foram afetados pela prematuridade na espécie ovina e a dexametasona teve influência positiva sobre a taxa de sobrevivência dos animais prematuros.(AU)

The aim of the study was to evaluate hematologic parameters and renal biochemical profile of full-term and premature lambs from birth to 48 hours of life, and assess the effect of dexamethasone on such variables. Four experimental groups were formed: NDG (normal delivery group - lambs vaginally delivered, n=15, average of 146-day gestation); NDEXG (normal delivery with dexamethasone group - lambs vaginally delivered whose mothers received 16 mg of dexamethasone at 141 days of gestation, n=8, average of 143-day gestation); PRE (premature lambs born by cesarean section at 138 days of gestation, n=10) and PREDEX (premature lambs born by cesarean section at 138 days gestation, whose mothers received 16 mg of dexamethasone two days before, n=9). Mean values of cell volume and hemoglobin content decreased during the observation period of 48 hours in all groups, but within the physiologic limits for ovine species. There was significant variation in plasma concentration of total protein in all periods evaluated, with the lowest mean values in PRE group. The leukocyte count was significantly higher in PN group only in M24h. Throughout the observation period, only PN group showed differences between M24h and the other moments and PRE group showed the lowest values of neutrophils in M0h, M15min and M60min. Serum creatinine concentration was significantly higher in group PRE in M60min, M24h and M48h. In all groups, there was a decrease in M24 and M48. The evaluated parameters were affected by prematurity in sheep and dexamethasone had a positive effect on the survival rate of premature animals.(AU)

Correlations between peripheral parasite load and common clinical and laboratory alterations in dogs with visceral leishmaniasis.

Intensity of peripheral parasite infection has an important role in the transmission of Leishmania spp. from one host to another. As parasite load quantification is still an expensive procedure to be used routinely in epidemiological surveillance, the use of surrogate predictors may be an important asset in the identification of dogs with high transmitting ability. The present study examined whether common clinical and laboratory alterations can serve as predictors of peripheral parasitism in dogs naturally infected with Leishmania spp. Thirty-seven dogs were examined in order to establish correlations between parasite load (PL) in multiple peripheral tissues and common clinical and laboratory findings in canine visceral leishmaniasis (CVL). Quantitative polymerase chain reaction was employed to determine PL in conjunctival swabs, ear skin, peripheral blood and buffy coat. Additionally, a series of hematological, biochemical and oxidative stress markers were quantified. Correlations between net peripheral infection and severity of clinical alterations and variation in laboratory parameters were assessed through a new analytical approach, namely Compressed Parasite Load Data (CPLD), which uses dimension reduction techniques from multivariate statistics to summarize PL across tissues into a single variable. The analysis revealed that elevation in PL is positively correlated with severity of clinical sings commonly observed in CVL, such as skin lesions, ophthalmic alterations, onycogriphosis, popliteal lymphadenomegaly and low body mass. Furthermore, increase in PL was found to be followed by intensification of non-regenerative anemia, neutrophilia, eosinopenia, hepatic injury and oxidative imbalance. These results suggest that routinely used clinical and laboratory exams can be predictive of intensity of peripheral parasite infection, which has an important implication in the identification of dogs with high transmitting ability.

Desempenho, sanidade animal e qualidade de filés de tilápias alimentadas com ração suplementada com biomassa bacteriana / Performance, animal health and fillets quality of tilapia fed diets supplemented with bacterial biomass

A aquicultura moderna é um dos setores de produção de alimentos que mais cresce no mundo. A tilápia, além de possuir grandes vantagens produtivas, origina produtos com grande aceitação pelo mercado. Em sua nutrição, podem ser utilizados aditivos com finalidades zootécnicas, pigmentantes ou antioxidantes. Este estudo objetivou avaliar o efeito da suplementação da dieta de tilápias com biomassa de Rubrivivax gelatinosus sobre o desempenho zootécnico e a saúde dos animais (histologia e hematologia) e sobre as características de qualidade dos filés (pH, composição químico-bromatológica, cor e rancidez). O experimento contou com seis tratamentos, compostos de um grupo controle, sem aditivos, um grupo contendo pigmentante comercial e quatro grupos com a biomassa nas concentrações de 175, 350, 700 e 1400mg/kg. Peixes pesando 21,42±5,65g foram criados por 74 dias em sistema com recirculação de água e, posteriormente, foram abatidos para a realização das análises. Não foram encontradas diferenças para os resultados das análises de desempenho, histológicas e hematológicas. Os filés dos grupos alimentados com os aditivos apresentaram menor umidade que o grupo controle, e os filés dos grupos alimentados com biomassa apresentaram as maiores teores proteicos. Não houve diferenças entre os tratamentos para os valores de pH, lipídeos e cinzas. Quanto à cor dos filés, todos os tratamentos com aditivos aumentaram a intensidade de vermelho. Em todos os tratamentos, a rancidez dos filés foi crescente durante o armazenamento, embora em menores valores nos filés dos grupos tratados com as maiores concentrações de biomassa. A biomassa de R. gelatinosus não promoveu alterações no desempenho nem na saúde animal e mostrou-se capaz de melhorar os aspectos de qualidade e conservação dos filés.

Modern aquaculture is one of the fastest growing food sectors in the world. Beyond having productivity advantages, tilapia fish yields products with great market acceptance. For its nutrition, additives aiming at increasing zootechnical, pigmenting or antioxidant features may be used. This study aimed to evaluate the effect of the supplementation of tilapia diets with Rubrivivax gelatinosus biomass on the performance and the health of animals (histology and hematology), and on the quality of fillets (pH, proximate composition, color and rancidity). The experiment comprised six treatments, made of a control group with no additives, a group containing commercial pigments and four groups with biomass at 175, 350, 700 and 1400 mg/kg. Fish weighing 21.42±5.65g were reared for 74 days in a system with water recirculation and slaughtered for analyzes. No differences were detected for performance, histological and hematological analyzes. Fillets of the groups fed additives had lower moisture content than the control group while the fillets of the groups fed the biomass had the highest protein percentages. No differences were detected among treatments for pH​, lipids and ash values. Regarding to the color of the fillets, all treatments with additives increased redness. For all treatments, rancidity in the fillets increased during storage, although the groups treated with the highest biomass concentrations had the lowest values. R. gelatinosus biomass did not change performance and animal health, and proved to be capable of improving fillets quality features and conservation.

Aquisição de imunidade passiva em cabritos alimentados com colostro de cabras com e sem mastite / Immunity of procurement in passive kids fed colostrum from goats with and without mastitis

O objetivo deste trabalho foi avaliar a transferência de imunidade passiva de cabras, que pariram com mastite, para seus respectivos cabritos. Os animais foram distribuídos em dois grupos, a saber: grupo 1 (GI), constituído por cabritos, filhos de cabras sem isolamento microbiológico em ambas as glândulas mamárias, e grupo 2 (GII), composto por cabritos, filhos de cabras com resultado positivo à lactocultura, em pelo menos uma das glândulas mamárias. Foram coletadas amostras de colostro e sangue à parição, bem como às 24 e às 48 horas após o parto/nascimento. O diagnóstico e o monitoramento da mastite nos animais foram realizados por meio do California Mastitis Test (CMT), contagem de células somáticas e isolamento microbiológico. A proteína total foi mensurada pelo método do biureto, e as concentrações de imunoglobulina A (IgA), imunoglobulina G (IgG), transferrina, albumina e haptoglobina por meio da eletrofoerese em gel de poliacrilamida contendo dodecil sulfato de sódio (SDS-PAGE). Os agentes mais isolados na cultura microbiológica foram os Staphylococcus coagulase negativa. Não houve diferença significativa (P<0,05) entre os valores médios de imunoglobulina G (IgG) nos cabritos provenientes de cabras com mastite quando comparados aos recém-nascidos oriundos de cabras livres de infecções intramamárias. Da mesma forma, a atividade de gamaglutamiltransferase (GGT) não mostrou diferença entre os grupos em todos os momentos avaliados. A ingestão de colostro decorrente de cabras com mastite não causou falha na transferência de imunidade passiva nos respectivos conceptos.

The aim of this study was to evaluate the transfer of passive immunity goats kidded with mastitis to their kids. The animals were divided into two groups, namely: Group 1 (GI) containing kids, sons of goats without microbiological isolation in both mammary glands, and Group 2 (GII), composed of kids, sons of goats with positive result to lactoculture in at least one of mammary glands. Colostrum samples and blood were collected after delivery, 24 and 48 hours after delivery / birth. The diagnosis and monitoring of mastitis in animals were performed using the California Mastitis Test (CMT), somatic cell count and microbiological isolation. Total protein was measured by the biuret method, and the concentrations of immunoglobulin A (IgA), immunoglobulin G (IgG), transferrin, albumin and haptoglobin through eletrofoerese polyacrylamide gel containing sodium dodecyl sulfate (SDS-PAGE). The agents most isolated in microbiological culture were coagulase-negative Staphylococcus. There was no significant difference (p <0.05) between the acquisition of immunoglobulin G (IgG) in goats from goats with mastitis compared to infants originating free goat mammary infections. Similarly the gamma glutamyl transferase (GGT) was equal in the comparison between groups in all evaluated moments. The colostrum intake resulting from goats with mastitis caused no failure in the passive transfer of immunity in their fetuses.

Leishmaniasis causes oxidative stress and alteration of oxidative metabolism and viability of neutrophils in dogs.

The aim of the present study was to test the hypothesis that oxidative stress and alteration of oxidative metabolism and apoptosis of neutrophils in dogs vary with the stage of leishmaniasis and to determine the contribution of uremia to such alterations. Dogs with leishmaniasis were classified into two stages: moderate (Leish II, n=20) or very severe (i.e. with concurrent uremia; Leish IV, n=20) according to the LeishVet Consensus. The two leishmaniasis groups were compared with uremic dogs without leishmaniasis (Uremic, n=10) and to healthy dogs (Control, n=30). To determine oxidative stress, total antioxidant/oxidant capacity, lipid peroxidation, total glutathione and the plasma antioxidants albumin, uric acid and bilirubin were quantified. Superoxide production was determined using the hydroethidine probe and viability and apoptosis were measured using annexin V-PE by capillary flow cytometry. Oxidative stress was present in both uremia and leishmaniasis with reduced total antioxidant capacity and was associated with increased induced production of superoxide and apoptosis. The greatest amount of oxidants was observed in animals with moderate disease only. Neutrophils from uremic dogs with and without leishmaniasis had decreased viability and an increased apoptosis rate in addition to increased lipid peroxidation. In conclusion, oxidative stress occurs in both stages of leishmaniasis with differences in intensity and levels of plasma markers; however, uremia does contribute to the decreased spontaneous viability of neutrophils in dogs in the final stage of the disease.

Neutrophil dysfunction varies with the stage of canine visceral leishmaniosis.

Canine visceral leishmaniosis (CVL) causes a dependent-stage alteration in neutrophil oxidative metabolism. When production of reactive oxygen species (ROS) exceeds the antioxidant capacity of neutrophils, apoptosis is triggered, impairing the viability and function of these cells, which can predispose dogs to infection. However, the uremic condition observed in late-stage CVL can also alter the viability and function of human neutrophils. To more clearly understand this relationship, the apoptosis rate and oxidative metabolism of neutrophils from control dogs (n=20) were compared to dogs in moderate (n=15) and very severe (n=15) stage CVL, classified according to LeishVet Consensus. To assess neutrophil oxidative metabolism, superoxide production was measured using the nitroblue tetrazolium reduction test (NBT) in isolated neutrophils. The apoptosis rate of neutrophils was estimated using the morphological method. Moderate-stage dogs presented increased superoxide production, while dogs with very severe stage CVL presented decreased superoxide production and an increase neutrophil apoptosis rate. Leishmaniosis causes differential neutrophil dysfunction according to disease stage. In moderate stage CVL, increased superoxide production is observed with no change in neutrophil viability. However, in very severe stage CVL, decreased superoxide production and increased apoptosis occur associated with uremia.