Constitutive Androstane Receptor-1 (CAR-1; NR1I3i1)
| Product Family | Product Number | Product Description | Technical Manual |
| IB0091 CAR-1 (NR1I3i1) |
IB00911-32 | Human CAR-1 Reporter Assay System, 3 x 32 assays in 96-well format | Technical Manual |
| IB00911 | Human CAR-1 Reporter Assay System, 1 x 96-well format assays | Technical Manual | |
| IB00912 | Human CAR-1 Reporter Assay System, 1 x 384-well format assays |
Constitutive Androstane Receptor-1 Assay Kits 
This Constitutive Androstane Receptor-1 (CAR-1) kit is an all-inclusive assay system that includes, in addition to CAR-1 Reporter Cells, two optimized media for use during cell culture and (optionally) in diluting the test samples, a positive-control inverse-agonist, Luciferase Detection Reagent, a cell culture-ready assay plate, and a detailed protocol.
CAR-1 Reporter Cells are prepared using INDIGO’s proprietary CryoMite™ process. This cryo-preservation method yields high cell viability post-thaw, and provides the convenience of immediately dispensing healthy, division-competent reporter cells into assay plates. There is no need for intermediate spin-and-wash steps, viability determinations, or cell titer adjustments.
INDIGO’s assay kits feature a luciferase detection reagent specially formulated to provide stable light emission between 5 and 90+ minutes after initiating the luciferase reaction. Incorporating a 5-minute reaction-rest period ensures that light emission profiles attain maximal stability, thereby allowing assay plates to be processed in batch. By doing so, the signal output from all sample wells, from one plate to the next, may be directly compared within an experimental set.
Kits are offered in different assay formats to accommodate researchers' needs: 3x 32 and 1x 96 assay formats for screening small numbers of test compounds, as well as custom bulk reagents for HTS applications.
Bulk assay reagents can be custom manufactured to accommodate any scale of HTS. Please inquire.
CAR-1 assay kit also available in: Mouse
Constitutive Androstane Receptor-1 Assay Services
The primary application of INDIGO’s cell-based nuclear receptor assays are to quantitatively assess the bioactivity of a test compound as an agonist (activator) or antagonist (inhibition of an agonist response) of a given receptor. Service assays include a positive control reference compound and ‘vehicle’ control for every experiment. A formal study report and all data files are provided to the client upon completion of the study. To receive a quote for your proposed study, complete & submit the online “Request a Quote” form or contact an INDIGO Customer Service Representative to discuss your desired study parameters.
CAR-1 Service Assays: Human, Rat, Mouse
Constitutive Androstane Receptor-1 Background
Human Constitutive Androstane Receptor-1 (CAR-1) exhibits constitutive activity, but can be further regulated through direct ligand interactions. The primary application of this reporter assay system is in the screening of test samples to quantify any functional inverse-agonist activity that they may exert on human CAR-1. INDIGO’s CAR-1 Reporter Assay System utilizes proprietary mammalian cells engineered to provide high-level expression of human CAR-1 (NR1I3 isoform 1), which is a constitutively active transcription factor.
Reporter Cells utilize a modified version of human CAR1 in which the N-terminal DNA binding domain (DBD) has been replaced with the GAL4-DBD. The human CAR1 ligand binding domain (LBD) is unaltered and fully functional. These reporter cells also incorporate a luciferase cDNA functionally linked to the GAL4-upstream activation sequence (UAS). Thus, quantifying expressed luciferase activity provides a sensitive surrogate measure of changes in CAR1 activity resulting from a direct interaction between a treatment compound and the nuclear receptor. Because this assay system expresses a GAL4-DBD + hCAR1 LBD hybrid receptor, the bio-activity of activators that act through indirect mechanisms (such as those that alter the phosphorylation status of the native N-terminal amino acid sequence of CAR1) may be dampened or go undetected.
CAR is encoded by the NR1I3 gene. This gene encodes a member of the nuclear receptor superfamily, and is a key regulator of xenobiotic and endobiotic metabolism. The protein binds to DNA as a monomer or a heterodimer with the retinoid X receptor and regulates the transcription of target genes involved in drug metabolism and bilirubin clearance, such as cytochrome P450 family members. Unlike most nuclear receptors, this transcriptional regulator is constitutively active in the absence of ligand but is regulated by both agonists and inverse agonists. Ligand binding results in translocation of this protein to the nucleus, where it activates or represses target gene transcription. These ligands include bilirubin, a variety of foreign compounds, steroid hormones, and prescription drugs.
The principle application of this assay product is in the screening of test samples to quantify functional inverse-agonist activities that they may exert against the human constitutive androstane receptor.
For more information on CAR, visit the Nuclear Receptor Resource.
Synonyms:Constitutive Androstane Receptor-1, CAR-1, NR1I3i1
Constitutive Androstane Receptor-1 Assay Data
Constitutive Androstane Receptor-1 Assay Research Areas
Xenobiotic Metabolism; Bile Acid and Xenobiotic Metabolism; Toxicology; NAFLD/NASH