Assessing the relevance of in vitro studies in nanotoxicology by examining correlations between in vitro and in vivo data.
Summary of "Assessing the relevance of in vitro studies in nanotoxicology by examining correlations between in vitro and in vivo data."
There is an urgent need for in vitro screening assays to evaluate nanoparticle (NP) toxicity. However, the relevance of in vitro assays is still disputable. We administered doses of TiO(2) NPs of different sizes to alveolar epithelial cells in vitro and the same NPs by intratracheal instillation in rats in vivo to examine the correlation between in vitro and in vivo responses. The correlations were based on toxicity rankings of NPs after adopting NP surface area as dose metric, and response per unit surface area as response metric. Sizes of the anatase TiO(2) NPs ranged from 3 to 100 nm. A cell-free assay for measuring reactive oxygen species (ROS) was used, and lactate dehydrogenase (LDH) release, and protein oxidation induction were the in vitro cellular assays using a rat lung Type I epithelial cell line (R3/1) following 24 h incubation. The in vivo endpoint was number of PMNs in bronchoalveolar lavage fluid (BALF) after exposure of rats to the NPs via intratracheal instillation. Slope analyses of the dose response curves shows that the in vivo and in vitro responses were well correlated. We conclude that using the approach of steepest slope analysis offers a superior method to correlate in vitro with in vivo results of NP toxicity and for ranking their toxic potency.
Department of Environmental Medicine, University of Rochester, Rochester, NY 14642, USA. XHan2100@gmail.com
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22487507
- DOI: http://dx.doi.org/10.1016/j.tox.2012.03.006
Biofilm formation may play an important role in the pathogenesis of infections caused by Enterococcus faecalis, including endocarditis. Most biofilm studies use a polystyrene dish assay to quantify bi...
Patients with fibromyalgia syndrome (FMS) generally present with chronic widespread pain, accompanied by a range of additional and non-specific symptoms, such as fatigue, disturbed sleep, and cognitiv...
A two-stage procedure for estimation and testing of observed measure correlations in the presence of missing data is discussed. The approach uses maximum likelihood for estimation and the false discov...
Manufactured nanomaterials (MNMs) are increasingly incorporated into everyday products and thus are entering the environment via manufacturing, product use, and waste disposal. Still, understanding MN...
Cytochrome P450 is a family of enzymes that catalyze reactions involved in the metabolism of drugs and other xenobiotics. These enzymes are, therefore, important in pharmacological and toxicological s...
This protocol is for a number of in vitro studies using human surgical biopsies and evaluating the pharmacology and genetics of human nociceptors ("pain detecting") neurons
Methods of infertility treatment may involve in vitro fertilization or IVF. Though effective, IVF is complex and expensive. Methods using no gonadotropin hormone stimulation of the ovaries...
OBJECTIVES: I. Investigate phenotype and genotype correlations in patients with Smith-Magenis syndrome (SMS) associated with del(17p11.2). II. Clinically evaluate SMS patients with unusua...
Peripheral blood mononuclear cells (PBMC) will be collected from patients who have leukemia or lymphoma or other medical conditions involving altered lymphohematopoietic stem cell or immun...
The purpose of this study is to culture primary human brain tumor cells with the specific aims of: 1. Develop primary cultures from human brain tumor surgical specimens 2. Dete...
Medical and Biotech [MESH] Definitions
Research using processes by which the reliability and relevance of a procedure for a specific purpose are established.
Works consisting of research using processes by which the reliability and relevance of a procedure for a specific purpose are established.
Studies using excised tissues.
A graphic means for assessing the ability of a screening test to discriminate between healthy and diseased persons; may also be used in other studies, e.g., distinguishing stimuli responses as to a faint stimuli or nonstimuli.
Classification system for assessing impact injury severity developed and published by the American Association for Automotive Medicine. It is the system of choice for coding single injuries and is the foundation for methods assessing multiple injuries or for assessing cumulative effects of more than one injury. These include Maximum AIS (MAIS), Injury Severity Score (ISS), and Probability of Death Score (PODS).