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Pathway Description
Morphine Metabolism Pathway
Homo sapiens
Drug Metabolism Pathway
Morphine exerts its analgesic by acting on the mu-opioid receptor of sensory neurons. Binding to the mu-opioid receptor activates associated G(i) proteins. These subsequently act to inhibit adenylate cyclase, reducing the level of intracellular cAMP. G(i) also activates potassium channels and inactivates calcium channels causing the neuron to hyperpolarize. The end result is decreased nerve conduction and reduced neurotransmitter release, which blocks the perception of pain signals.
References
Morphine Pathway References
Maurer HH, Sauer C, Theobald DS: Toxicokinetics of drugs of abuse: current knowledge of the isoenzymes involved in the human metabolism of tetrahydrocannabinol, cocaine, heroin, morphine, and codeine. Ther Drug Monit. 2006 Jun;28(3):447-53. doi: 10.1097/01.ftd.0000211812.27558.6e.
Pubmed: 16778732
Opioids. (2009). e-CPS (online version of Compendium of Pharmaceuticals and Specialties). Retrieved October 25, 2009.
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