Cytotoxicity of Reparative Endodontic Cements on Human Periodontal Ligament Stem Cells

ABSTRACT Objective To compare the cytotoxicity of commercial reparative endodontic cements on human periodontal ligament stem cells (hPDLSCs). Material and Methods The culture of hPDLSCs was established. Cell density was set at 2 × 104 cells/well in 96-well plates. Extracts of Biodentine, Bio-C Repair, Cimmo HD, MTA Repair HP and White MTA were prepared. Then, the extracts were diluted (pure, 1:4 and 1:16) and inserted into cell-seeded wells for 24, 48, and 72 h to assess cell viability through MTT assay. hPDLSCs incubated with culture medium alone served as a negative control group. Data were analyzed by Two-Way ANOVA and Tukey's test (α=0.05). Results At 24 h, pure extract of MTA Repair HP and Biodentine 1:16 presented higher cell viability compared to control. Lower cell viability was found for pure extract of Cimmo HD, MTA Repair HP 1:4 and 1:16, and White MTA 1:16. At 48 h, pure extract of Bio-C Repair and MTA Repair HP presented higher cell viability compared to control. At 72 h, only the pure extract of MTA Repair HP led to higher cell proliferation compared to control. Conclusion Biodentine, Bio-C Repair and MTA Repair HP were able to induce hPDLSCs proliferation. Cimmo HD and White MTA were found to be mostly cytotoxic in hPDLSCs.

A Review on COVID-19 Diagnosis Tests Approved for Use in Brazil and the Impact on Pandemic Control

Abstract With the COVID-19 pandemic, many diagnostic tests (molecular or immunological) were rapidly standardised, given the urgency of the situation, many are still in the process of being validated. The main objective of this study was to review the aspects of the diagnostic kits approved in Brazil and their application in the different federative units to gather epidemiological information. In order to achieve these objectives, a survey was carried out on the data available at the regulatory agency (ANVISA) and in the literature. The main countries that have registered products in Brazil are China (51.4%), Brazil (16.6%), South Korea (9.2%), USA (8.8%) and Germany (3.6%). The methodologies of these products are based on the detection of nucleic-acid (15.8%), antigen (13%) and antibody (71.2%). In the immunological tests, it was verified that the sensitivity ranged from 55 to 100% and the specificity from 80 to 100%. The percentage of cases in the samples tested in Brazil is elevated in almost all federative units since eight states showed 40% of positive cases in tested samples, while 18 states displayed between 20 and 40%. In conclusion, this review showed that Brazil is dependent on external technology to respond to pandemics, epidemics and endemics disease and needs to improve its biotechnological scheme to solve further diseases outbreaks.

Reactividad serológica a antígenos del metacéstodo de Taenia solium en una población de estudiantes del estado de Hidalgo / Serologic reactivity to Taenia solium metacestode antigens in a student population at Hidalgo

En México la cisticercosis humana continúa siendo uno de los problemas más serios de salud pública. La Organización Mundial de la Salud (OMS) considera a México como un país de alta endemicidad, con 1.9 por ciento de defunciones por cisticercosis cerebral. Debido a los diferentes órganos del hombre que llega a parasitar es difícil hacer el diangóstico, razón por la que se ha tratado de establecer por métodos de laboratorio un diagnóstico, razón por la que se ha tratado de establecer por métodos de laboratorio un diagnóstico adecuado y oportuno. A partir de los trabajos de Nieto en 1956, las pruebas de inmunodiagnóstico de la cisticercosis se han desarrollado considerablemente. El objetivo de este estudio, consistió en detectar la reactividad serológica contra cuatro antígenos del metacéstodo de T. solium en una población abierta mediante hemaglutinación indirecta. Se estudiaron 122 sueros de estudiantes de 16 a 24 años de edad en Santiago Tulantepec, estado de Hidalgo. Los metacéstodos de T. solium se aislaron de cerdos parasitados. Los antígenos utilizados fueron: somático completo (ASC), somático incompleto (ASI), fluido vesicular (AFV) y excreciones y secreciones(AES). Seis de los 122 sueros estudiados (4.9 por ciento) resultaron positivos con títulos de dilución de 1:32, cuatro sueros presentaron seropositividad a los antígenos AFV y ASC, uno resulto positivo a ASC, y otro a ASC, AFV y AES. Se copncluye que el grupo de edad estudiado presenta un alto porcenjate de individuos seropositivos comparado con estudios previos, hecho que habla de la necesidad de intensificar programas de prevención en este tipo de poblaciones

Desarrollo de un ensayo de dot-blot para la detección de adhesinas en Escherichia coli enterotoxigéna / Dot-blot immunoenzymatic reaction to detec adhesins from enteropathogenic Escherichia coli

Un método de detección de adhesinas K99, K88 y F41 de Escherichia coli enterotoxigénica ha sido desarrollado sobre membranas de nitrocelulosa, basado en la reacción inmunoenzimática de dot-blot. Suspensiones estandarizadas de este microorganismo, portando distintos tipos de adhesinas fueron sembrados en el papel y enfrentados a anticuerpos-sonda de especificidad probada y posteriormente a un conjugado peoxidasa-antianticuerpo. La prueba mostró ser de alta sensibilidad y específica del tipo de adhesina, pudiendo emplearse como ensayo diagnóstico en la detección de esos factores de virulencia