ABSTRACT
Mucoepidermoid lung carcinoma is frequently manifested by obstructive trachea symptoms. It is necessary to develop effective curative or palliative therapeutic strategies for treating mucoepidermoid lung carcinoma through administration of compounds that improve ionizing radiation treatment, thereby increasing the effects of the treatment on tumor cells while minimizing the effects on normal tissues surrounding the tumor cells. Resveratrol is a polyphenolic phytoalexin present in wines and several plants and has a broad spectrum of biological activities, including antioxidant and anticarcinogenic effects. The biological effects of ionizing radiation plus resveratrol have been examined in different types of cell in many studies. Here, we aimed to verify the effects of resveratrol on mucoepidermoid lung carcinoma cells NCI-H292 exposed to ionizing radiation. In vitro studies in NCI-H292 cell culture using neutral red uptake assays showed that the cytotoxicity index (IC50) of resveratrol was 401.5 µM, and the lethal dose 50 % (LD50) of ionizing radiation in the absence of resveratrol was 693 Gy. In vitro micronucleus...(AU)
Subject(s)
Radiation , Radiation, Ionizing , Fluorescence , Lung NeoplasmsABSTRACT
The fascicular composition and organisation of the inferior alveolar nerve (IAN) were determined to confirm the microarchitecture of the IAN bundles into each of the mandibular teeth, including the composition of the mental nerve. The aim of this study was to evaluate peripheral nerve repair after the application of an antioxidant compound to the damaged nerve tissue to elevate the concentration and bioavailability of elements capable of favouring tissue repair. Twenty-five Wistar rats were divided into groups: The Control 1 (Ctl 1) (n = 5) animals had the ischiatic nerve exposed with no suture injury and were sacrificed at 30 days post-operatively. The Control 2 (Ctl 2) (n = 10) animals had the ischiatic nerve exposed, and the nerve was injured using suture in three distinct regions. In the experimental (Exp) animals (n = 10), an antioxidant organic compound was applied to the nerve injury site...(AU)
Subject(s)
Patients , Rats , Diagnosis , AntioxidantsABSTRACT
Hidrogéis constituídos de poli N-vinil-2-porrolidona (PVP), ágar e polietilenoglicol (PEG) säo utilizados como membranas para uso tópico, no tratamento de lesöes de pele. Com o objetivo de melhorar algumas das propriedades mecânicas da membrana, como tensäo de ruptura e elongaçäo, substituiu-se o PEG pelo copolímero poli (dimetilsiloxano)-co-poli (óxido de etileno) (SEO). A biocompatibilidade "in vitro" das membranas de PVP-SEO com diferentes concetraçöes de SEO foi testada em cultura de células. O teste de citotoxicidade foi realizado pelo estudo comparativo de dois métodos: 1) difusäo em ágar, utilizando-se as linhagens celulares RC-IAL e NCTC Clone L-929 e 2) inibiçäo da formaçäo de colônias utilizando-se a linhagem celular CHO-K1. Os resultados obtidos nos dois métodos foram análogos e demonstraram que as membranas do PVP-SEO apresentaram toxicidade nas concentraçöes testadas e nas linhagens celulares utilizadas. Foi possível também concluir que a adiçäo de SEO ocasiona caráter citotóxico às membranas de PVP
Hydrogels composed by PVP, agar and PEG are used as wound dressings in the treatmentof skin ulcers. In order to improve the mechanical properties of the membrane, such as tensile strengthand elongation, PEG was replaced by copolymer poly (dimethilsiloxane)-co-polyoxiethylene (SEO).The "in vitro" biocompatibility evaluation of PVP-SEO membranes with different concentrations of SEOwas carried out in cell culture. A comparative study of cytotoxicity assays was performed by twomethods: 1) diffusion agar assay, using RC-IAL and NCTC Clone L-929 cells and 2) colony suppressionassay, using CHO-K1 cells. In the cytotoxic evaluation of PVP-SEO membranes by both methods,analogous results were obtained. It was also possible to conclude that the addition of SEO promotescytotoxicity in PVP membranes