In Vitro Toxicology Testing Services: Timely, Effective Toxicity Analysis
Rapidly assess therapeutic candidates’ potential for drug-drug interactions and accurately predict xenobiotic-induced liver toxicity with INDIGO’s in vitro
toxicology testing Services.
Get Reliable Data & Clear Toxicity Reports from Our Expert Scientists
Affordable In Vitro Toxicology Solutions
Reliable and cost-effective, we offer in vitro toxicity testing services designed to provide the answers you need.
Fast Screening & Data Delivery
Access crucial toxicology information quickly with INDIGO’s in vitro toxicity testing services.
Detailed Reports & Available Technical Support
Our team delivers high-quality data analysis and reviews, putting INDIGO’s many years of experience at your service.
Human P-Glycoprotein/MDR1 Drug Interaction Assay Services
Get your therapeutic candidates screened early and quickly identify their potential effects on P-gp, also known as MDR1, a key protein involved in cross-membrane drug transport.
Upgrade your safety assessment process with INDIGO’s Human P-Glycoprotein (P-gp) Interaction Assay Services and fast-track your drugs to FDA validation.
Applications for INDIGO’s In Vitro Toxicity Testing Assays
Get Started in Three Simple Steps
Design your next study rapidly and confidently with our expert team.
Step 2: Design Your Service Study with Our Scientists
Receive your quote and a custom draft of your Service Work Order.
Review and adjust to fit your needs.
Step 3: Send Your Samples and Get Your Results
Provide your samples or compounds, and we will do the rest.
Receive a complete data package and clear study reports in record time!
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Frequently Asked Questions
INDIGO’s assays are not binding assays. They are cell-based trans-activation assays, and the principal application is in the screening of test samples to quantify any functional activity, either agonist or antagonist, that the compounds may exert against the nuclear receptors. INDIGO reporter systems utilize firefly luciferase reporter gene technology, and while there is a binding taking place, our assays do not measure it. Instead, the luciferase light response is measured which correlates to the activation status of the receptor (either activation or inhibition).
Quantifying changes in luciferase expression in the treated reporter cells provides a sensitive surrogate measure of the changes in receptor activity. It will tell the scientist the significance (strength) of the interaction by the level of light emitted. In addition, cell-based assays are more sensitive and able to detect smaller levels of activation.
INDIGO’s nuclear receptor assays utilize proprietary human and non-human mammalian cells engineered to provide constitutive, high-level expression of the designated receptor. Specific cell type information for each assay is proprietary and available only through consultation with INDIGO’s technical team following a screening service or assay kit purchase.
Reporter cells included in INIDIGO’s steroid hormone nuclear assay kits (ERα, ERβ, AR, PGR, MR, GR) express the native, full-length receptors. INDIGO’s other nuclear receptor assays, however, include reporter cells that express hybrid nuclear receptors. In these cases, the respective receptor’s native N-terminal sequence comprising the DNA Binding Domain (DBD) has been replaced with sequence encoding the yeast Gal4-DBD. All other native NR functional/structural domains (ligand binding domain, hinge region, and various activation domains) are present in these hybrid receptors.
These reporter cells also contain the firefly luciferase reporter gene functionally linked to the upstream genetic response element for Gal4. Consequently, once a bioactive compound associates with the ligand binding domain of the hybrid receptor, only the luciferase reporter gene is induced. Ligand-activation of the hybrid receptor will not induce collateral expression of target genes that are otherwise regulated by the native nuclear receptor.
View our list of reference compounds. We do utilize commercially available reference agonists for our assays, and this reference agonist is included in each assay kit. We do use reference antagonists where a reference is known and commercially available. Some of our antagonist assays do not have reference antagonists available.
Treatment concentrations are prepared at INDIGO using serial dilutions in fixed increments; the starting concentration and increment of dilution is specified by the customer via our Study Work Order sheet that accompanies all screening studies. For accurate determination of EC50 and/or IC50 values, we recommend at minimum spanning a 5,000-fold concentration range over 8 doses. This strategy requires a 3.33-fold or 4-fold increment of serial dilution. The minimum doses recommended for EC50 and/or IC50 value is 7 test concentrations.
Upon completion of your study, you will receive a detailed study report (PDF format) including all assay methods and validation, the raw data and calculations of your study (Excel format), and graphing files of all data (GraphPad Prism format). In addition, you are always welcome to contact INDIGO’s team for assistance in interpretation of your data.