ChemiSCREEN Membrane Preparation Recombinant Human LPA₁ Lysophospholipid Receptor

Human EDG2 encoding LPA₁

Lysophosphatidic acid (LPA) is a lysophospholipid produced by activated platelets that inhibits adenylate cyclase and stimulates DNA synthesis, changes in cell morphology, and increases in intracellular calcium in a variety of cultured mammalian cells. A family of three GPCRs, LPA₁, LPA₂ and LPA₃, mediates the biological effects of LPA (Contos et al., 2000). LPA₁ is widely expressed, with particularly notable expression in the ventricular zone of the embryonic cerebral cortex. Mice lacking LPA₁ exhibit craniofacial abnormalities and defective development of the cerebral cortex (Harrison et al., 2003; Choi et al., 2008). LPA₁ also promotes fibrotic responses to tissue injury (Tager et al., 2008)

Millipore′s LPA₁ Membrane Preparation is a crude membrane preparation made from the proprietary stable recombinant cell line that is also used for Millipore’s LPA₁ Calcium Optimized Cell Line (HTS089C). This LPA₁ Membrane Preparation exhibits both constitutive and agonist-induced activity in GTPγS binding assays; thus it is an ideal HTS tool for screening of compounds for agonist, inverse agonist, and antagonist activities. The membrane preparations exhibits EC50 of 73 nM for LPA in a GTPγS binding assay.

GTPγS binding assay

GPCR Class: A

Protein Target: LPA1 / EDG2

Target Sub-Family: Lysophospholipid

Inucbation Conditions
GTPγS ASSAY CONDITIONS: Membranes are permeabilized by addition of saponin to an equal concentration by mass, then mixed with [³⁵S]-GTPγS (final concentration of 0.3 nM) in 20 mM HEPES, pH 7.4/100 mM NaCl/10 mM MgCl₂/10 μM GDP in a nonbinding 96-well plate. Unlabeled ligand was added to the final concentration indicated in Figure 1 (final volume 100 μL), and incubated for 30 min at 30°C. The binding reaction is transferred to an FB filter plate (Millipore MAHF B1H) previously prewetted with water. The plate is washed 3 times (1 mL per well per wash) with cold 10 mM sodium phosphate, pH 7.4, then dried and counted.

One package contains enough membranes for at least 200 assays (units), where one unit is the amount of membrane that will yield greater than 1000 cpm specific LPA-stimulated [35S]-GTPγS binding.
Liquid in packaging buffer: 50 mM Tris pH 7.4, 10% glycerol and 1% BSA with no preservatives.
Packaging method: Membrane protein was adjusted to the indicated concentration in packaging buffer, rapidly frozen, and stored at -80°C.

Store at –70°C. Product is stable for at least 6 months from the date of receipt when stored as directed. Do not freeze and thaw.

1 unit = 5 μg
EC50 in GTPγS binding assay by LPA: ~ 73 nM

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