4-P-PDOT

4-P-PDOT is a potent, selective and affinity Melatonin receptor (MT2) antagonist. 4-P-PDOT is >300-fold more selective for MT2 than MT1. 4-P-PDOT significantly counteracts Melatonin-mediated antioxidant effects (GSH/GSSG ratio, phospho-ERK, Nrf2 nuclear translocation, Nrf2 DNA-binding activity)[1][2][3][4].

Signaling Pathways >> Neuronal Signaling >> Melatonin Receptor

Signaling Pathways >> GPCR/G Protein >> Melatonin Receptor

Research Areas >> Neurological Disease

MT2 receptor[1]

In CHO-mt1 cells the amidotetraline 4-P-PDOT (10 mM) has no e€ect on forskolin-stimulated cyclic AMP levels, either alone, or in the presence of Melatonin. In contrast, in CHO-MT2 cells, 4-P-PDOT is an agonist, producing a concentration-dependent inhibition of forskolin stimulated cyclic AMP, with a pEC50 value of 8.72 and intrinsic activity of 0.86[1].

4-P-PDOT (0.5-1.0 mg/kg; intravenous injection; klotho mutant mice) treatment significantly reverses antioxidant effects mediated by Melatonin. And significantly reverses the changes in the levels of these GSH-related parameters. 4-P-PDOT treatment significantly reverses the memory function of Melatonin-treated klotho mutant mice. 4-P-PDOT also counteracts Melatonin-mediated attenuation in response to the decreases in phospho-ERK expression, Nrf2 nuclear translocation, Nrf2 DNA-binding activity, and GCL mRNA expression in the hippocampi of klotho mutant mice[2]. Animal Model: Klotho mutant mice treatment with Melatonin[2] Dosage: 0.5 mg/kg or 1.0 mg/kg Administration: Intravenous injection Result: Significantly reversed antioxidant effects mediated by Melatonin. Significantly reversed the changes in the levels of these GSH-related parameters. Significantly reversed the memory function of Melatonin-treated klotho mutant mice.

[1]. Dubocovich ML. Melatonin receptors: are there multiple subtypes? Trends Pharmacol Sci. 1995 Feb;16(2):50-6.

[2]. hin EJ, et al. Melatonin attenuates memory impairment induced by Klotho gene deficiency via interactive signaling between MT2 receptor, ERK, and Nrf2-related antioxidant potential. Int J Neuropsychopharmacol. 2014 Dec 30;18(6). pii: pyu105.

[3]. Christopher Browning, et al. Pharmacological characterization of human recombinant melatonin mt1 and MT2 receptors. British Journal of Pharmacology (2000) 129, 877-886.

[4]. Dubocovich ML, et al. Melatonin receptor antagonists that differentiate between the human Mel1a and Mel1b recombinant subtypes are used to assess the pharmacological profile of the rabbit retina ML1 presynaptic heteroreceptor. Naunyn Schmiedebergs Arch Pharmacol. 1997 Mar;355(3):365-75.