Lactoferrina bovina disminuye la invasión de Salmonella enterica en células HEp-2 / Bovine lactoferrin decreases the invasion of Salmonella enterica to HEp-2 cells

Objetivo: Evaluar el efecto de la lactoferrina bovina (Lfb) en el proceso de invasión de Salmonella enterica ser. Typhimurium en células HEp-2. Materiales y métodos: Se infectaron células HEp-2 con 10(6) unidades formadoras de colonia (UFC) de la bacteria en ausencia y presencia de 1 y 10 mg/mL de Lfb (saturada con hierro) durante 1,5 horas a 37°C. En este estudio evaluamos 2 tratamientos: pre-infección (las células HEp-2 se incubaron con Lf 1 hora, previo a la infección con Salmonella) y post-infección (la Lfb se adicionó 15 minutos después de la infección). La capacidad de invasión de Salmonella se determinó mediante la cuantificación de las UFC recuperadas desde el interior de las células HEp-2 (después del tratamiento con 100 μg/mL y 10 μg/mL de gentamicina y Triton X-100). Resultados: En el tratamiento pre-infección se observó una disminución de 23% en la invasión de Salmonella cuando las células HEp-2 fueron pre-incubadas con 1 mg/mL de Lfb (2,8x10(5) vs 2,1x10(5), p=0,04) y una disminución de 50% cuando fueron pre-incubadas con 10 mg/mL de Lfb (2,8x10(5) vs 1,4x10(5), p=0,04). Con el tratamiento post-infección no se observaron cambios en la capacidad de invasión de Salmonella. Conclusiones: Los resultados indican que Lfb reduce la capacidad de invadir de Salmonella enterica ser. Typhimurium a células HEp-2 en el tratamiento pre-infección

Objective: To assess the effect of bovine lactoferrin (bLf) on the invasion of Salmonella enterica ser. Typhimurium to HEp-2 cells. Materials and methods: HEp-2 monolayers were infected with 10(6) colony forming unit (CFU) of bacteria in the absence and presence of 1 and 10 mg/mL of bLf (iron-saturated) and incubated 1.5 hours at 37°C. Two treatments were evaluated: preinfection (HEp-2 cells were incubated with bLf one hour prior to infection with Salmonella) and post-infection (bLf was added 15 minutes after the infection). Invasiveness of Salmonella was determined throgh quantification of CFU recovered from inside the HEp-2 cells (after treatment with 100 μg/mL and 10 μg/mL of gentamicin and Triton X -100). Results: In the pre-infection treatment, we observed a decrease of 23% of Salmonella invasion when HEp-2 cells were pre incubated with 1 mg/mL of bLf (2.8x105 vs 2.1x105, p=0.04) and 50% when them were pre-incubated with 10 mg/mL of bLf (2.8x10(5) vs 1.4x10(5), p=0.04). In post-infection treatment, no changes were observed in the invasiveness of Salmonella. Conclusion: The results indicated that bLf reduces the invasiveness of Salmonella enterica ser. Typhimurium to HEp-2 cells in the pre-infection treatment

A possible defective estimation of antineutrophil cytoplasmic antibodies in systemic lupus erythematosus due ot the coexistence of periodontitis: preliminary observations

The objectives of this study is to determine if periodontitis-related ANCA hinder the accurate estimation of this kind of autoantibodies in systemic lupus erythematosus (SLE), due to the frequent coexistence of SLE and periodontitis, and the high incidence of antineutrophil cytoplasmic antibodies (ANCA) in this periodontal condition. Thirty SLE, thirty periodontitis lacking systemic involvement patients, and twenty healthy controls were utilized in this study. The periodontal condition and the presence of ANCA in sera of all individuals was carefully evaluated. For ANCA determination an EIA essay was utilized, directed to a neutrophil granular extract and six neutrophil granule proteins. Sixty percent of SLE patients had periodontitis, and sixty-five percent were ANCA positive. Eighty three percent of all ANCA cases were coexisting with periodontitis. A significant association (p > 0.005) between periodontitis and ANCA was found (Chi Square Test). Fifty percent of the patients with periodontitis lacking systemic involvement were ANCA positive. The results obtained in this study suggest that the figures of ANCA previously reported for SLE, might be overestimated due to the inadvertent presence of periodontitis

Factores salivales de defensa no inmunoglobulínicos / Non-immunoglobulinic defense salivary factors

Este trabajo describe y analiza los principales factores antimicrobianos no inmunoglobulínicos de la saliva, su función biológica, interacciones y relación con diversas situaciones fisiológicas y patológicas que pueden presentarse en la cavidad bucal. Finalmente, se reseñan algunas aplicaciones clinicoterapéuticas de estos factores, destacando la necesidad de nuevas investigaciones destinadas a probar otros tratamientos que contribuyan a incrementar la efectividad de los sistemas innatos de defensa