Tumor necrosis factor concentrations in hemolytic uremic syndrome patients and children with bloody diarrhea in Argentina.

Hemolytic uremic syndrome (HUS) is thought to be a vascular endothelial injury disease. The mechanism of injury is unknown although verocytotoxins (Shiga-like toxins (SLTs)) are known to be associated with it. Recent evidence suggests that in vitro treatment of some endothelial cells with tumor necrosis factor alpha (TNF-alpha) dramatically increases their susceptibility to SLTs. We studied 25 children with HUS, 63 children with SLT-positive bloody diarrhea, 62 children with bloody diarrhea not associated with SLTs and 39 children admitted for elective surgery, included as an age- and season-matched control group. The TNF-alpha concentrations were found to be significantly elevated in children with HUS (range, 1 to 95 pg/ml; geometric mean, 32.2 pg/ml) compared with the healthy controls (range, 0 to 53 pg/ml; mean, 12.5 pg/ml; P < 0.001). Because it is hypothesized that TNF-alpha elevation might precede development of HUS, we also studied children with blood diarrhea. The TNF-alpha serum concentrations were significantly higher during the first 10 days after onset of bloody diarrhea than after the first 10 days (P < 0.02). Such elevation could be associated with vascular endothelial glycolipid receptor up-regulation and increased susceptibility to the effects of SLTs.

Carcinoma verrugoso de localizacion lingual: hibridacion in situ positiva para ADN-HPV16 y amplificacion de ORF E6 del HPV16 mediante reaccion en cadena de la polimerasa / Verrucous carcinoma of linguals localization: in situ positive hibridization to ADN-HPV16 and ORF E6 amplification of the HPV16 throug polimerase chain reaction

Los papilomavirus humanos son un grupo hetereogeneo de ADN virusque causan lesiones epiteliales hiperplasicas, papilomatosas y verrugosas en la piel y mucosas de varios animales y de humanos. En este trabajo hemos usado "hibridacion in situ" para detectar secuencias de ADN relacionadas al papilomavirus tipo 16, y reaccion en cadena de la polimerasa para la deteccion del marco de lalectura abierta "E6", en una biopsia fijada en formol y embebida en parafina, de un paciente de 31 anos de edad, quien desarrollo un carcinoma epidermoide sobreun carcinoma verrugoso. Nuestros resultados aportan evidencia al concepto que involucra como agente etiologico del carcinoma epidermoide al papilomavirus, probablemente actuando sinergicamente con otros carcinogenos