Catalog # |
Size |
Price |
|
|---|---|---|---|
| 045-54 | 200 µg | $168 |
)
|
Trp-Val-Arg-Glu-Tyr-Ile-Asn-Ser-Leu-Glu-Met-Ser
|
| 1526.73 | |
|
| ≥ 95% |
|
| Exhibits correct molecular weight |
|
|
Up to 6 months in lyophilized form at 0-5ºC. For best results, rehydrate just before use. Aliquot before freezing to avoid repeated freeze-thaw cycles. |
|
| White powder |
|
| Each vial contains 200 μg of NET peptide. |
Background and purpose: The G-protein-coupled receptor GPR75 (Gq) and its ligand, the cytochrome P450-derived vasoactive eicosanoid 20-hydroxyeicosatetraenoic acid (20-HETE), are involved in the activation of pro-inflammatory and hypertensive signaling cascades contributing to diabetes, obesity, vascular dysfunction/remodeling, hypertension and cardiovascular disease. Little is known as to how, where and with what affinity 20-HETE interacts with GPR75.
Experimental approach: To better understand the pairing of 20-HETE and its receptor (GPR75), we used surface plasmon resonance (SPR) to determine binding affinity/kinetics. The PRESTO-Tango receptor-ome methodology for GPR75 overexpression was coupled with FLIPR Calcium 6 assays, homogeneous time-resolved fluorescence (HTRF) IP-1 and β-arrestin recruitment assays to determine receptor activation and downstream signaling events.
Key results: SPR confirmed 20-HETE binding to GPR75 with an estimated KD of 1.56 × 10-10 M. In GPR75-transfected HTLA cells, 20-HETE stimulated intracellular Ca2+ levels, IP-1 accumulation and β-arrestin recruitment, all of which were negated by known 20-HETE functional antagonists. Computational modelling of the putative ligand-binding pocket and mutation of Thr212 within the putative 20-HETE binding site abolished 20-HETE's ability to stimulate GPR75 activation. Knockdown of GPR75 in human endothelial cells nullified 20-HETE-stimulated intracellular Ca2+ . The chemokine CCL5, a suggested GPR75 ligand, binds to GPR75 (KD of 5.85 × 10-10 M) yet fails to activate GPR75; however, it inhibited 20-HETE's ability to activate GPR75 signaling.
Conclusions and implications: We have identified 20-HETE as a high-affinity ligand for GPR75 and CCL5 as a low-affinity negative regulator of GPR75, providing additional evidence for the deorphanization of GPR75 as a 20-HETE receptor.
Pascale JV, Park EJ, Adebesin AM, Falck JR, Schwartzman ML, Garcia V. Uncovering the signalling, structure and function of the 20?HETE?GPR75 pairing: Identifying the chemokine CCL5 as a negative regulator of GPR75. Br J Pharmacol.
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