Ataxia telangiectasia (AT) cell lines are characterised by their hypersensitivity to ionizing radiation and bleomycin, and their failure to inhibit DNA synthesis after DNA damage. A recent report [Singh et al. (1988) Nucl. Acids Res. 16, 3919-3929] indicated that a reduction in topoisomerase II (topo II) activity was a feature of AT lymphoblast cell lines. We have studied the possible role of D...

Purpose: Spatially Fractionated Radiation Therapy (SFRT) is characterized by large differences in peak and valley doses. Preclinical clinical studies suggest that biological mechanisms lead to differential normal tissue tumor response compared uniform irradiation. We hypothesize evaluate effectiveness understand fundamental mechanisms, radiobiological rather than physical dose quantities should...

background: gemcitabine (2′, 2′-difluoro-2′- deoxycytidine, an analogue of deoxycytidine) is a relatively new drug with wide range of anti-cancer activity. in this study, radiosensitizing effects of gemcitabine was investigated on hela and mrc5 human originated cell lines under both chronically hypoxic and normoxic conditions using the micronucleus (mn) assay. materials and methods: for inducti...

BACKGROUND All-trans retinoic acid (ATRA) stimulates elastin synthesis by lung fibroblasts and induces alveolar regeneration in animal models of pulmonary emphysema. However, ATRA treatment has had disappointing results in human emphysema. It was hypothesised that a defect in the ATRA signalling pathway contributes to the defect of alveolar repair in the human emphysematous lung. METHODS Fibr...

OBJECTIVES The dose-response relationship of radiation-induced bystander effect (RIBE) is controversial at high dose levels. The aim of the present study is to assess RIBE at high dose levels by examination of different endpoints. MATERIALS AND METHODS This experimental study used the medium transfer technique to induce RIBE. The cells were divided into two main groups: QU-DB cells which rece...

The measurement of γ-H2AX foci induction in cells provides a sensitive and reliable method for the quantitation of DNA damage responses in a variety of cell types. Accurate and rapid methods to conduct such observations are desirable. In this study, we have employed the novel technique of multispectral imaging flow cytometry to compare the induction and repair of γ-H2AX foci in three human cell...

BACKGROUND Although zinc oxide nanoparticles (ZnO NPs) have been widely used, there has been an increasing number of reports on the toxicity of ZnO NPs. However, study on the underlying mechanisms under in vivo conditions is insufficient. METHODS In this study, we investigated the toxicological profiles of ZnO NPs in MRC5 human lung fibroblasts in vitro and in an in vivo model using the fruit...

Chronic lung disease of prematurity/bronchopulmonary dysplasia (BPD) is the leading cause of perinatal morbidity in developed countries. Inflammation is a prominent finding. Currently available interventions have associated toxicities and limited efficacy. While BPD often resolves in childhood, survivors of preterm birth are at risk for acquired respiratory disease in early life and are more li...

In the continuation of our study substituted isocoumarins a series novel 3-azolyl isocoumarin and their thio derivatives, including some related lactone compounds was prepared biologically profiled against C. albicans showing moderate activity with MIC values in range 4?60 ?g mL-1, general. The additional characterisation selected carried out by exploring on CYP3A4 CYP2D6 enzymes, while experim...