HTS080M
ChemiSCREEN Human NK1 Tachykinin Receptor Membrane Preparation
Human NK1 GPCR membrane preparation for Radioligand binding Assays & GTPγS binding.
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About This Item
UNSPSC Code:
41106514
eCl@ss:
32161000
NACRES:
NA.84
Recommended Products
biological source
human
Quality Level
recombinant
expressed in Chem-1 cells
manufacturer/tradename
ChemiScreen
Chemicon®
technique(s)
ligand binding assay: suitable (GTPγS)
radioligand binding assay (RLBA): suitable
NCBI accession no.
UniProt accession no.
shipped in
dry ice
General description
Full-length human TACR1 cDNA encoding NK1
The tachykinin peptide family in mammals comprises three peptides, substance P, neurokinin A and neurokinin B, which bind to the tachykinin receptor family of GPCRs, NK1, NK2 and NK3 (Severini et al., 2002). Tachykinins have prominent activity in the GI system, in which they stimulate intestinal contraction and salivation. These effects are mediated by NK1 and NK2, and an antagonist of NK1, aprepitant, is used for treatment of chemotherapy-induced emesis (Rupniak and Kramer, 1999). The NK1 tachykinin receptor is expressed in brain, and is thought to be involved in depression and nociception (Saria, 1999). Although NK1 appears to promote nociception in animal models, the significance of this activity is controversial, as antagonists of NK1 have not proven efficacious in pain relief in humans (Hill, 2000). Chemicon′s NK1 membrane preparations are crude membrane preparations made from our proprietary stable recombinant cell lines to ensure high-level of GPCR surface expression; thus, they are ideal HTS tools for screening of antagonists of NK1 interactions with Substance P. The membrane preparations exhibit a Kd of 0.28-0.4 nM for [125I]-Substance P. With 10 µg/well NK1 Membrane Prep and 0.25 nM [125I]-Substance P, a greater than 5-fold signal-to-background ratio was obtained.
Application
Radioligand binding assay and GTPγS binding.
Biochem/physiol Actions
GPCR Class: A
Protein Target: NK1
Target Sub-Family: Tackykinin /neurokinin
Quality
Signal:background and specific binding values obtained in a competition binding assay with varying amounts of NK1 membrane prep:
| 10 µg/well | |
|---|---|
| Signal:Background | 7.17 |
| Specific Binding (cpm) | 2210 |
SPECIFICATIONS: 1 unit = 10 µg
Bmax : 0.38 pmol/mg
Kd: 0.34 nM
Specifications
Inucbation Conditions
Membranes are mixed with radioactive ligand and unlabeled competitor (see Figures 1 and 2 for concentrations tested) in binding buffer in a nonbinding 96-well plate, and incubated for 1-2 h. Prior to filtration, a GF/C 96-well filter plate is coated with 0.33% polyethyleneimine for 30 min, then washed with 50mM HEPES, pH 7.4, 0.5% BSA. Binding reaction is transferred to the filter plate, and washed 3 times (1 mL per well per wash) with Wash Buffer. The plate is dried and counted.
Binding buffer: 50 mM Hepes, pH 7.4, 5 mM MgCl2, 1 mM CaCl2, 0.2% BSA, filtered and stored at 4°C
Radioligand: [125I]-Substance P (Perkin Elmer#:NEX190 )
Wash Buffer: 50 mM Hepes, pH 7.4, 500mM NaCl , 0.1% BSA, filtered and stored at 4°C.
One package contains enough membranes for at least 200 assays (units), where a unit is the amount of membrane that will yield greater than 5-fold signal:background with 125I labeled Substance P at 0.25 nM
Membranes are mixed with radioactive ligand and unlabeled competitor (see Figures 1 and 2 for concentrations tested) in binding buffer in a nonbinding 96-well plate, and incubated for 1-2 h. Prior to filtration, a GF/C 96-well filter plate is coated with 0.33% polyethyleneimine for 30 min, then washed with 50mM HEPES, pH 7.4, 0.5% BSA. Binding reaction is transferred to the filter plate, and washed 3 times (1 mL per well per wash) with Wash Buffer. The plate is dried and counted.
Binding buffer: 50 mM Hepes, pH 7.4, 5 mM MgCl2, 1 mM CaCl2, 0.2% BSA, filtered and stored at 4°C
Radioligand: [125I]-Substance P (Perkin Elmer#:NEX190 )
Wash Buffer: 50 mM Hepes, pH 7.4, 500mM NaCl , 0.1% BSA, filtered and stored at 4°C.
One package contains enough membranes for at least 200 assays (units), where a unit is the amount of membrane that will yield greater than 5-fold signal:background with 125I labeled Substance P at 0.25 nM
Physical form
Liquid in packaging buffer: 50 mM Tris pH 7.4, 10% glycerol and 1% BSA no preservatives.
Packaging method: Membranes protein were adjusted to 0.5 mg/ml in 1 mL packaging buffer, rapidly frozen, and stored at -80°C.
Packaging method: Membranes protein were adjusted to 0.5 mg/ml in 1 mL packaging buffer, rapidly frozen, and stored at -80°C.
Storage and Stability
Maintain frozen at -70°C for up to 2 years. Do not freeze and thaw.
Legal Information
CHEMICON is a registered trademark of Merck KGaA, Darmstadt, Germany
Disclaimer
Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.
Storage Class Code
10 - Combustible liquids
WGK
WGK 1
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Certificates of Analysis (COA)
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N M Rupniak et al.
Trends in pharmacological sciences, 20(12), 485-490 (2000-02-12)
The development of small-molecule antagonists of the substance P (SP)-preferring tachykinin NK1 receptor during the past decade represents an important opportunity to exploit these molecules as novel therapeutic agents. On the basis of its anatomical localization and function, SP has
R Hill
Trends in pharmacological sciences, 21(7), 244-246 (2000-06-29)
Tachykinin NK1 receptor antagonists have failed to exhibit efficacy in clinical trials of a variety of clinical pain states. By contrast, in preclinical studies in animals NK1 receptor antagonists have been shown to attenuate nociceptive responses sensitized by inflammation or
Cinzia Severini et al.
Pharmacological reviews, 54(2), 285-322 (2002-05-31)
The tachykinin peptide family certainly represents one of the largest peptide families described in the animal organism. So far, more than 40 tachykinins have been isolated from invertebrate (insects, worms, and molluscs), protochordate, and vertebrate (skin, gastrointestinal tract, peripheral and
A Saria
European journal of pharmacology, 375(1-3), 51-60 (1999-08-12)
After its discovery in 1931, substance P (SP) remained the only mammalian member of the family of tachykinin peptides for several decades. Tachykinins thus refer to peptides sharing the common C-terminal amino acid sequence Phe-X-Gly-Leu-Met x NH2. In recent years
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