Non Animal Testing, Alternative Test Methods, In Vitro Toxicology, IIVS | Assays 3T3 Neutral Red Uptake
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Archive

Video: The 3T3 Neutral Red Uptake Phototoxicity Test

October 31, 2018
This training video explores a cell-based method for assessing Phototoxicity — or the potential for chemicals to cause damage after being exposed to light.  The method is used widely around the world by many industries, including the cosmetics and pharmaceutical sectors. Disclaimer:  Please note that the procedures shown in this video were for demonstration purposes only and that all assay procedures, except the UV A/dark exposure, should be performed in a biological safety cabinet using aseptic techniques. Due to video production reasons,...

China’s Compulsory Animal Testing for Cosmetics May Take More Than Five Years to Stop

October 17, 2018
By Amanda Lim, Editor (Singapore) CosmeticsDesign-Asia.com   Although China has made significant strides in moving away from animal testing, its challenges suggest it may take more than five years for the country to completely stop compulsory animal-testing for cosmetics, says Hedy He, regulatory analyst and editor of ChemLinked: "In the short term a total ban on animal testing is unlikely given the lack of testing infrastructure and technical capacity shortcomings of the industry." The Overarching Issue Among the many obstacles, the overarching one is the...

Evaluation of Phototoxicity of Ocular Medical and Combination Devices

March 28, 2018
To address ocular device induced phototoxicity, an in vitro 3T3 Neutral Red Uptake Phototoxicity test (OECD 432) for chemicals has been modified. Soft contact lenses formulated with three different photo-absorbing compounds and chemical solutions of these compounds were evaluated....

The Assessment of Phototoxicity Using the 3T3 Neutral Red Uptake (NRU) Phototoxicity Assay and a Modified Photo-Direct Peptide Reactivity Assay (DPRA)

March 28, 2018
Alternative methods, including the validated 3T3 Neutral Red Uptake (NRU) Phototoxicity assay (OECD TG 432) may be used as a pre-clinical test to address phototoxicity. Currently, there are no validated alternative test methods to identify photoallergens; however, there are several validated alternative test methods to address skin sensitization, including the Direct Peptide Reactivity Assay (DPRA) (OECD 442C). To address photoallergy, we utilized the 3T3 Phototoxicity assay in combination with a modified photo-DPRA assay to determine if these assays were able...

Video: The 3T3 Neutral Red Uptake Phototoxicity Test – Spanish

October 6, 2017
This new training video explores a cell-based method for assessing Phototoxicity — or the potential for chemicals to cause damage after being exposed to light. The method is used widely around the world by many industries, including the cosmetics and pharmaceutical sectors. Disclaimer: Please note that the procedures shown in this video were for demonstration purposes only and that all assay procedures, except the UV A/dark exposure, should be performed in a biological safety cabinet using aseptic techniques. Due to video production...

Video: The 3T3 Neutral Red Uptake Phototoxicity Test — Chinese

November 21, 2016
This training video with Chinese subtitles explores a cell-based method for assessing Phototoxicity — or the potential for chemicals to cause damage after being exposed to light. The method is used widely around the world by many industries, including the cosmetics and pharmaceutical sectors. Disclaimer: Please note that the procedures shown in this video were for demonstration purposes only and that all assay procedures, except the UVA/dark exposure, should be performed in a biological safety cabinet using aseptic techniques. Due to...

Video: The 3T3 Neutral Red Uptake Phototoxicity Test — Portuguese

November 21, 2016
This new training video with Portuguese subtitles explores a cell-based method for assessing Phototoxicity — or the potential for chemicals to cause damage after being exposed to light. The method is used widely around the world by many industries, including the cosmetics and pharmaceutical sectors. Disclaimer: Please note that the procedures shown in this video were for demonstration purposes only and that all assay procedures, except the UV A/dark exposure, should be performed in a biological safety cabinet using aseptic techniques....

Webinar: How GLPs Enhance the Quality of Regulated and Non-Regulated Toxicology

October 18, 2016
This one-hour webinar, led by IIVS Director of Quality and Compliance, introduces some of the concepts of Good Laboratory Practices (GLPs) designed to promote study and data integrity within an in vitro toxicology framework. Applying these concepts within your own laboratory should aid in production of robust, repeatable studies. View Slides...

Reconstructed Human Epidermis (RHE) Models

August 24, 2016
The 3-D Phototoxicity assay uses 3-D reconstructed human epidermal (RHE) tissue constructs to evaluate the dermal phototoxicity potential of a test material. Toxicity is determined by measuring cytotoxicity [based on the relative conversion of MTT (3-[4,5 - dimethylthiazol-2-yl] - 2,5 - diphenyltetrazolium bromide)] in cultures treated with the test material in the presence or absence of UVA light. An advantage of using 3-D tissues to evaluate phototoxicity potential is that, unlike the 96-well phototoxicity assay, test materials are applied topically, so solids,...

3T3 Neutral Red Uptake (OECD 432)

August 24, 2016
The 3T3 Neutral Red Uptake (NRU) Phototoxicity assay is a 96-well cytotoxicity-based assay that utilizes normal BALB/c 3T3 mouse fibroblasts to measure the concentration-dependent reduction in neutral red uptake by the cells after exposure to a test material either in the presence or absence of UVA light. Duplicate 96-well monolayers of 3T3 fibroblasts are exposed to serial dilutions of a test material. One of the plates is exposed to 5 J/cm2 UVA while the other plate is kept in the...