Anti-dentine Salivary SIgA in young adults with a history of dental trauma in deciduous teeth.

Anti-dentin autoantibodies are associated with inflammatory root resorption in permanent teeth and are modulated by dental trauma and orthodontic force. However, it is not known whether deciduous tooth trauma can stimulate the development of a humoral immune response against dentin. The aim of this study was to evaluate the levels of salivary SIgA reactivity against human dentin extract in young adults with a history of trauma in the primary dentition. A sample of 78 patients, aged 18 to 25, who had completed an early childhood (0 to 5 years old) caries prevention program years earlier at the Universidade Estadual de Londrina Pediatric Clinic, underwent radiographic examination and salivary sampling. Anti-dentin SIgA levels were analyzed by immunoenzymatic assay and Western blotting. Although dental trauma to deciduous teeth had occurred in 34 (43.6%) of the patients, no differences in SIgA levels were detected between individuals who had experienced trauma and those who had not (p > 0.05). Multivariate regression analysis showed no association between dental trauma and SIgA levels (p > 0.05). Patients with a history of deciduous trauma presented low levels of anti-dentin antibodies, associated with orthodontic root resorption (p < 0.05). Western blot analysis showed that salivary antibodies recognized a single band of approximately 45 kDa in dentin extract. We concluded that salivary SIgA recognizes a specific component of the dentin matrix and that anti-dentin antibodies were not triggered by trauma to primary teeth. However, trauma to deciduous teeth may down-modulate SIgA in response to orthodontic root response.

The production and characterization of anti-bothropic and anti-crotalic IgY antibodies in laying hens: a long term experiment.

Ophidian accidents represent a great public health problem in developing countries. Recent studies have shown that antibodies produced in laying hens could be an alternative method for producing antivenin in mammals. In this study we analyzed the production of IgY antibodies in laying hens inoculated with snake venom from the Bothrops and Crotalus genera over a 360-day period. IgY antibodies present in the serum and egg yolks were analyzed according to avidity, antigen recognition pattern and efficiency in neutralizing the venom. The levels of anti-bothropic and anti-crotalic IgY antibodies increased significantly after the third immunization, and remained at these levels until the end of the experiment. Significantly high avidity levels were observed for anti-bothropic IgY antibodies on the 142nd day and for anti-crotalic antibodies on the 232nd day after the first immunization. Anti-bothropic IgY antibodies recognized antigens with molecular masses ranging from 25 kDa to 50 kDa, whereas anti-crotalic IgY antibodies mainly recognized antigens with molecular masses of 14 kDa and 30 kDa. An increase in the antigens recognized by the antivenins was observed during the experimental period. Samples of bothropic IgY antivenin antibodies presented an efficiency of 290 µl/3 DL50, a potency of 0.307 mg/ml and a specific activity of 0.230. Samples of anti-crotalic IgY antibodies presented an efficiency of 246 µl/4 DL50, a potency of 0.829 mg/ml and a specific activity of 0.271. These results show that the administration of successive doses of the venoms for more than 6 months results in an antivenin with higher avidity that is able to recognize a greater number of antigens present in the venoms. These characteristics indicate a more efficient and potent antivenin than what has been described in other studies.

Anti-dentine Salivary SIgA in young adults with a history of dental trauma in deciduous teeth

Anti-dentin autoantibodies are associated with inflammatory root resorption in permanent teeth and are modulated by dental trauma and orthodontic force. However, it is not known whether deciduous tooth trauma can stimulate the development of a humoral immune response against dentin. The aim of this study was to evaluate the levels of salivary SIgA reactivity against human dentin extract in young adults with a history of trauma in the primary dentition. A sample of 78 patients, aged 18 to 25, who had completed an early childhood (0 to 5 years old) caries prevention program years earlier at the Universidade Estadual de LondrinaPediatric Clinic, underwent radiographic examination and salivary sampling. Anti-dentin SIgA levels were analyzed by immunoenzymatic assay and Western blotting. Although dental trauma to deciduous teeth had occurred in 34 (43.6%) of the patients, no differences in SIgA levels were detected between individuals who had experienced trauma and those who had not (p > 0.05). Multivariate regression analysis showed no association between dental trauma and SIgA levels (p > 0.05). Patients with a history of deciduous trauma presented low levels of anti-dentin antibodies, associated with orthodontic root resorption (p < 0.05). Western blot analysis showed that salivary antibodies recognized a single band of approximately 45 kDa in dentin extract. We concluded that salivary SIgA recognizes a specific component of the dentin matrix and that anti-dentin antibodies were not triggered by trauma to primary teeth. However, trauma to deciduous teeth may down-modulate SIgA in response to orthodontic root response.

Detecção de Salmonella spp e Listeria monocytogenes através de técnica de PCR / Detection of Salmonella spp and Listeria monocytogenes through PCR / Detección de Salmonella spp y Listeria monocytogenes a través de la técnica de PCR

A maioria dos casos de doenças transmitidas por alimentos é causada por bactérias como Salmonella spp, Listeria monocytogenes, Campylobacter spp e Escherichia coli, entre outros. A contaminação decorre do consumo de alimentos contaminados preparados sob condições impróprias de higiene, manipulação e conservação. Para a detecção dessas bactérias em alimentos, o método convencional de isolamento é o mais utilizado, porém a técnica é demorada e laboriosa. A Reação em Cadeia da Polimerase (PCR) é um método rápido e sensível na detecção de agentes patogênicos e tem sido bastante estudada e gradativamente empregada nas indústrias de alimentos. O objetivo deste trabalho foi avaliar o limite de detecção da técnica de PCR, para Salmonella spp e L. monocytogenes. O limite para detecção das bactérias foram 2 e 5 UFC para Salmonella spp e L. monocytogenes, respectivamente, demonstrando uma boa sensibilidade da técnica de PCR...

Most cases of foodborne illnesses are caused by bacteria such as Salmonella spp, Listeria monocytogenes, Campylobacter spp, Escherichia coli, among others. Contamination stems from the consumption of contaminated food prepared under improper hygiene, handling and storage conditions. For the detection of bacteria in food, the conventional isolation method is the most commonly used, but the technique is labor-intensive and time consuming. The Polymerase Chain Reaction (PCR) is a rapid and sensitive method for the detection of pathogen agents, and has been extensively studied and gradually used in food industries. The objective of this study is to evaluate the sensitivity of the PCR method for the detection of Salmonella spp and L. monocytogenes. The threshold for the detection of bacteria was 2 and 5 CFU for Salmonella spp and L. monocytogenes, respectively, presenting a high sensitivity to PCR...

La mayoría de los casos de enfermedades transmitidas por alimentos es causada por bacterias como la Salmonella spp, Listeria monocytogenes, Campylobacter spp y Escherichia coli, entre otros. La contaminación se produce por el consumo de alimentos contaminados y preparados bajo condiciones inadecuadas de higiene, manipulación y conservación. Para la detección de esas bacterias en alimentos, el método convencional de aislamiento es el más utilizado, pero la técnica es laboriosa y consume mucho tiempo. La Reacción en Cadena de la Polimerasa (PCR) es un método rápido y sensible para la detección de patógenos y ha sido ampliamente estudiado y gradualmente empleada en las industrias de alimentos. El objetivo de este estudio fue evaluar el límite de detección de la técnica de PCR, para L. monocytogenes y Salmonella spp. El límite para detección de las bacterias fueron 2 y 5 UFC para Salmonella spp y L. monocytogenes, respectivamente, demostrando buena sensibilidad a la técnica de PCR...