Journal
ARCHIVES OF PHARMACAL RESEARCH
Volume 38, Issue 6, Pages 1019-1032Publisher
PHARMACEUTICAL SOC KOREA
DOI: 10.1007/s12272-015-0560-4
Keywords
4-(Phenylthio)-1H-pyrazole; Niacin; GPR109A; G-protein; beta-Arrestin; Biased agonist
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Funding
- Korea Research Council for Industrial Science and Technology [KK-1203-D0]
- National Research Council of Science & Technology (NST), Republic of Korea [KK-1203, KK-1203-D0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Even though nicotinic acid (niacin) appears to have beneficial effects on human lipid profiles, niacin-induced cutaneous vasodilatation called flushing limits its remedy to patient. GPR109A is activated by niacin and mediates the anti-lipolytic effects. Based on the hypothesis that beta-arrestin signaling mediates niacin-induced flushing, but not its anti-lipolytic effect, we tried to find GPR109A agonists which selectively elicit G(i)-protein-biased signaling devoid of beta-arrestin internalization using a beta-lactamase assay. We identified a 4-(phenyl)thio-1H-pyrazole as a novel scaffold for GPR109A agonist in a high throughput screen, which has no carboxylic acid moiety known to be important for binding. While 1-nicotinoyl derivatives (5a-g, 6a-e) induced beta-arrestin recruitment, 1-(pyrazin-2-oyl) derivatives were found to play as G-protein-biased agonists without GPR109A receptor internalization. The activity of compound 5a (EC50 = 45 nM) was similar to niacin (EC50 = 52 nM) and MK-6892 (EC50 = 74 nM) on calcium mobilization assay, but its activity at 10 mu M on beta-arrestin recruitment were around two and five times weaker than niacin and MK-6892, respectively. The development of G-protein biased GPR109A ligands over beta-arrestin pathway is attainable and might be important in differentiation of pharmacological efficacy.
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