||Powder -20oC 3 years 4oC 2 years In solvent -80oC 6 months -20oC 1 month
||10 mM in DMSO
Ki16425 is a competitive, potent and reversible antagonist to LPA1, LPA2 and LPA3 with Ki of 0.34 μM, 6.5 μM and 0.93 μM, respectively, shows no activity at LPA4, LPA5, LPA6. IC50 value: 0.3/6.5/0.93 uM(Ki, LPA1/2/3)  Target: LPA1/2/3
How to use:
in vitro: Kil6425 preferentially inhibits LPA1- and LPA3-mediated responses but has only a moderate effect on LPA2. Ki16425 inhibits the LPA-induced Ca(2+) response in THP-1 cells, 3T3 fibroblasts, and A431 cells, but had only a marginal effect in PC-12 cells and HL-60 cells, which means that Ki16425 seems to be a useful tool for evaluating the involvement of specific LPA receptors in the short-term response to LPA. Ki16425 inhibits long-term DNA synthesis and cell migration as induced by LPA in Swiss 3T3 fibroblasts . Ki16425 reduces the LPA-induced activation of p42/p44 mitogen activated protein kinase (MAPK), while acting as a weak stimulator of p42/p44 MAPK on its own, properties typical of a protean agonist. Ki16425 also significantly reduces the NGF-induced stimulation of p42/p44 MAPK and inhibited NGF-stimulated neurite outgrowth in PC-12 cells .
in vivo: Ki-16425 (30 mg/kg, i.p.) completely blocks LPA-induced neuropathic pain-like behaviors, when administered 30 min but not 90 min before lysophosphatidic acid injection, suggesting that Ki-16425 is a short-lived inhibitor. Ki-16425 also inhibits nerve injury-induced up-regulation of Caα2δ-1 in the dorsal root ganglion and reduction of SP immunoreactivity in the spinal dorsal horn .
. Ohta H, et al. Ki16425, a subtype-selective antagonist for EDG-family lysophosphatidic acid receptors.Mol Pharmacol, 2003, 64(4), 994-1005.
. Moughal NA, et al. Protean agonism of the lysophosphatidic acid receptor-1 with Ki16425 reduces nerve growth factor-induced neurite outgrowth in pheochromocytoma 12 cells. J Neurochem, 2006, 98(6), 1920-1929.
. Ma L, et al. Evidence for lysophosphatidic acid 1 receptor signaling in the early phase of neuropathic pain mechanisms in experiments using Ki-16425, a lysophosphatidic acid 1 receptor antagonist. J Neurochem, 2009, 109(2), 603-610.