TY - JOUR
T1 - Hybrid inhibitor of peripheral cannabinoid-1 receptors and inducible nitric oxide synthase mitigates liver fibrosis
AU - Cinar, Resat
AU - Iyer, Malliga R.
AU - Liu, Ziyi
AU - Cao, Zongxian
AU - Jourdan, Tony
AU - Erdelyi, Katalin
AU - Godlewski, Grzegorz
AU - Szanda, Gergő
AU - Liu, Jie
AU - Park, Joshua K.
AU - Mukhopadhyay, Bani
AU - Rosenberg, Avi Z.
AU - Liow, Jeih San
AU - Lorenz, Robin G.
AU - Pacher, Pal
AU - Innis, Robert B.
AU - Kunos, George
N1 - Funding Information:
This work was supported by intramural funds from the National Institute on Alcohol Abuse and Alcoholism to GK, the National Institute of Mental Health to RBI, and the National Institute of Drug Abuse to MRI. We thank Kenner Rice for helpful comments and Bill Leister for use of their LC-MS and Noel Whittaker for mass spectrometry data on MRI-1867. We thank Judy Harvey-White for technical assistance with mass spectrometry experiments.
Publisher Copyright:
© 2016 American Society for Clinical Investigation. All rights reserved.
PY - 2016/7/21
Y1 - 2016/7/21
N2 - Liver fibrosis, a consequence of chronic liver injury and a way station to cirrhosis and hepatocellular carcinoma, lacks effective treatment. Endocannabinoids acting via cannabinoid-1 receptors (CB1R) induce profibrotic gene expression and promote pathologies that predispose to liver fibrosis. CB1R antagonists produce opposite effects, but their therapeutic development was halted due to neuropsychiatric side effects. Inducible nitric oxide synthase (iNOS) also promotes liver fibrosis and its underlying pathologies, but iNOS inhibitors tested to date showed limited therapeutic efficacy in inflammatory diseases. Here, we introduce a peripherally restricted, orally bioavailable CB1R antagonist, which accumulates in liver to release an iNOS inhibitory leaving group. In mouse models of fibrosis induced by CCl4 or bile duct ligation, the hybrid CB1R/iNOS antagonist surpassed the antifibrotic efficacy of the CB1R antagonist rimonabant or the iNOS inhibitor 1400W, without inducing anxiety-like behaviors or CB1R occupancy in the CNS. The hybrid inhibitor also targeted CB1R-independent, iNOS-mediated profibrotic pathways, including increased PDGF, Nlrp3/Asc3, and integrin αvβ6 signaling, as judged by its ability to inhibit these pathways in cnr1–/– but not in nos2–/– mice. Additionally, it was able to slow fibrosis progression and to attenuate established fibrosis. Thus, dual-target peripheral CB1R/iNOS antagonists have therapeutic potential in liver fibrosis.
AB - Liver fibrosis, a consequence of chronic liver injury and a way station to cirrhosis and hepatocellular carcinoma, lacks effective treatment. Endocannabinoids acting via cannabinoid-1 receptors (CB1R) induce profibrotic gene expression and promote pathologies that predispose to liver fibrosis. CB1R antagonists produce opposite effects, but their therapeutic development was halted due to neuropsychiatric side effects. Inducible nitric oxide synthase (iNOS) also promotes liver fibrosis and its underlying pathologies, but iNOS inhibitors tested to date showed limited therapeutic efficacy in inflammatory diseases. Here, we introduce a peripherally restricted, orally bioavailable CB1R antagonist, which accumulates in liver to release an iNOS inhibitory leaving group. In mouse models of fibrosis induced by CCl4 or bile duct ligation, the hybrid CB1R/iNOS antagonist surpassed the antifibrotic efficacy of the CB1R antagonist rimonabant or the iNOS inhibitor 1400W, without inducing anxiety-like behaviors or CB1R occupancy in the CNS. The hybrid inhibitor also targeted CB1R-independent, iNOS-mediated profibrotic pathways, including increased PDGF, Nlrp3/Asc3, and integrin αvβ6 signaling, as judged by its ability to inhibit these pathways in cnr1–/– but not in nos2–/– mice. Additionally, it was able to slow fibrosis progression and to attenuate established fibrosis. Thus, dual-target peripheral CB1R/iNOS antagonists have therapeutic potential in liver fibrosis.
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U2 - 10.1172/jci.insight.87336
DO - 10.1172/jci.insight.87336
M3 - Article
AN - SCOPUS:85007551738
SN - 2379-3708
VL - 1
JO - JCI Insight
JF - JCI Insight
IS - 11
M1 - e87336
ER -