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KEY RESULTS Our consensus results unequivocally demonstrate that the prototypical μ-opioid agonist morphine (3.75-100 mg·kg-1 s.c. or 3-30 mg·kg-1 i.p.) as well as the potent opioid fentanyl (0.05-0.35 mg·kg-1 s.c.) do indeed induce respiratory depression and constipation in β-arrestin2 knockout mice in a dose-dependent manner indistinguishable from that observed in wild-type mice. CONCLUSION AND IMPLICATIONS Our findings do not support the original suggestion that β-arrestin2 signalling plays a key role in opioid-induced respiratory de