Journal of Neuroinflammation | |
4′-O-methylhonokiol increases levels of 2-arachidonoyl glycerol in mouse brain via selective inhibition of its COX-2-mediated oxygenation | |
Jürg Gertsch1  Roch-Philippe Charles1  Wolfgang Schuehly2  Vanessa Petrucci1  Maria Salomé Gachet1  Andrea Chicca1  | |
[1] Institute of Biochemistry and Molecular Medicine, NCCR TransCure, University of Bern, Bühlstrasse 28, Bern, CH-3012, Switzerland;Institute of Zoology, Karl-Franzens-University Graz, Universitätsplatz 2, Graz, 8010, Austria | |
关键词: Magnolia grandiflora; 2-arachidonoyl glycerol; Endocannabinoid system; Partial agonist; Polypharmacology; CB2 receptor; COX-2; Endocannabinoids; 4′-O-methylhonokiol; | |
Others : 1227089 DOI : 10.1186/s12974-015-0307-7 |
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received in 2015-02-06, accepted in 2015-04-24, 发布年份 2015 | |
【 摘 要 】
Background and purpose
4′-O-methylhonokiol (MH) is a natural product showing anti-inflammatory, anti-osteoclastogenic, and neuroprotective effects. MH was reported to modulate cannabinoid CB2 receptors as an inverse agonist for cAMP production and an agonist for intracellular [Ca2+]. It was recently shown that MH inhibits cAMP formation via CB2 receptors. In this study, the exact modulation of MH on CB2 receptor activity was elucidated and its endocannabinoid substrate-specific inhibition (SSI) of cyclooxygenase-2 (COX-2) and CNS bioavailability are described for the first time.
Methods
CB2 receptor modulation ([35S]GTPγS, cAMP, and β-arrestin) by MH was measured in hCB2-transfected CHO-K1 cells and native conditions (HL60 cells and mouse spleen). The COX-2 SSI was investigated in RAW264.7 cells and in Swiss albino mice by targeted metabolomics using LC-MS/MS.
Results
MH is a CB2 receptor agonist and a potent COX-2 SSI. It induced partial agonism in both the [35S]GTPγS binding and β-arrestin recruitment assays while being a full agonist in the cAMP pathway. MH selectively inhibited PGE2 glycerol ester formation (over PGE2) in RAW264.7 cells and significantly increased the levels of 2-AG in mouse brain in a dose-dependent manner (3 to 20 mg kg−1) without affecting other metabolites. After 7 h from intraperitoneal (i.p.) injection, MH was quantified in significant amounts in the brain (corresponding to 200 to 300 nM).
Conclusions
LC-MS/MS quantification shows that MH is bioavailable to the brain and under condition of inflammation exerts significant indirect effects on 2-AG levels. The biphenyl scaffold might serve as valuable source of dual CB2 receptor modulators and COX-2 SSIs as demonstrated by additional MH analogs that show similar effects. The combination of CB2 agonism and COX-2 SSI offers a yet unexplored polypharmacology with expected synergistic effects in neuroinflammatory diseases, thus providing a rationale for the diverse neuroprotective effects reported for MH in animal models.
【 授权许可】
2015 Chicca et al.; licensee BioMed Central.
【 预 览 】
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