Format

Send to

Choose Destination
Bioorg Med Chem. 2014 Sep 1;22(17):4694-703. doi: 10.1016/j.bmc.2014.07.012. Epub 2014 Jul 16.

Discovery, structure-activity relationship studies, and anti-nociceptive effects of 1-phenyl-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-one as novel opioid receptor agonists.

Author information

1
Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 35053, Taiwan, ROC.
2
Department of Pharmacology, University of Minnesota, Medical School, Minneapolis, MN 55455, USA.
3
Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 35053, Taiwan, ROC. Electronic address: bau9763@bp.nhri.org.tw.
4
Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County 35053, Taiwan, ROC. Electronic address: shueng@nhri.org.tw.

Abstract

The μ-opioid receptor (MOR) is the major opioid receptor targeted by most analgesics in clinical use. However, the use of all known MOR agonists is associated with severe adverse effects. We reported that the 1-phenyl-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-ones are novel opioid receptor agonists. Subsequent structural modification resulted in the potent MOR/KOR (κ-opioid receptor) agonists 19, 20, and 21. Testing the analgesic effect of these in WT B6 mice (tail-flick test) gave ED50 values of 8.4, 10.9, and 26.6mg/kg, respectively. The 1-phenyl-3,6,6-trimethyl-1,5,6,7-tetrahydro-4H-indazol-4-one core could be addressed in 1 or 2 synthetic steps with moderate to high percent of yield. In the adenylyl cyclase assay, compound 19 displayed a MOR/KOR agonist profile, with IC50 values of 0.73 and 0.41μM, respectively. Current results suggest that compound 19 is a promising lead to go further development and in vitro/in vivo adverse effects studies.

KEYWORDS:

Anti-nociceptive effects; Structure–activity relationship; Tail-flick test; μ/κ opioid receptor agonist

PMID:
25087049
DOI:
10.1016/j.bmc.2014.07.012
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center