Morphine (BioDeep_00000001550)

描述信息

Morphine, also known as (-)-morphine or morphine sulfate, is a member of the class of compounds known as morphinans. Morphinans are polycyclic compounds with a four-ring skeleton with three condensed six-member rings forming a partially hydrogenated phenanthrene moiety, one of which is aromatic while the two others are alicyclic. Morphine is soluble (in water) and a very weakly acidic compound (based on its pKa). Morphine can be synthesized from morphinan. Morphine is also a parent compound for other transformation products, including but not limited to, myrophine, heroin, and codeine. Morphine can be found in a number of food items such as nanking cherry, eggplant, millet, and common hazelnut, which makes morphine a potential biomarker for the consumption of these food products. Morphine can be found primarily in blood and urine, as well as in human kidney and liver tissues. In humans, morphine is involved in several metabolic pathways, some of which include heroin action pathway, morphine metabolism pathway, heroin metabolism pathway, and codeine metabolism pathway. Morphine is a non-carcinogenic (not listed by IARC) potentially toxic compound. Morphine is a drug which is used for the relief and treatment of severe pain. The primary source of morphine is isolation from poppy straw of the opium poppy. In 2013, an estimated 523 000 kg of morphine were produced. About 45 000 kg were used directly for pain, a four-time increase over the last twenty years. Most use for this purpose was in the developed world. About 70\\% of morphine is used to make other opioids such as hydromorphone, oxymorphone, and heroin. It is a Schedule II drug in the United States, Class A in the United Kingdom, and Schedule I in Canada. It is on the World Health Organizations List of Essential Medicines, the most effective and safe medicines needed in a health system. Morphine is sold under many trade names . Primarily hepatic (90\\%), converted to dihydromorphinone and normorphineand is) also converted to morphine-3-glucuronide (M3G) and morphine-6-glucuronide. Virtually all morphine is converted to glucuronide metabolites; only a small fraction (less than 5\\%) of absorbed morphine is demethylated (DrugBank). In the treatment of morphine overdosage, primary attention should be given to the re- establishment of a patent airway and institution of assisted or controlled ventilation. Supportive measures (including oxygen, vasopressors) should be employed in the management of circulatory shock and pulmonary edema accompanying overdose as indicated. Cardiac arrest or arrhythmias may require cardiac massage or defibrillation. The pure opioid antagonists, such as naloxone, are specific antidotes against respiratory depression which results from opioid overdose. Naloxone should be administered intravenously; however, because its duration of action is relatively short, the patient must be carefully monitored until spontaneous respiration is reliably re-established. If the response to naloxone is suboptimal or not sustained, additional naloxone may be administered, as needed, or given by continuous infusion to maintain alertness and respiratory function; however, there is no information available about the cumulative dose of naloxone that may be safely administered (L1712) (T3DB).
Morphine is the principal alkaloid in opium and the prototype opiate analgesic and narcotic. In 2017, morphine was the 155th most commonly prescribed medication in the United States, with more than four million prescriptions. Morphine is used primarily to treat both acute and chronic severe pain. Its duration of analgesia is about three to seven hours. A large overdose of morphine can cause asphyxia and death by respiratory depression if the person does not receive medical attention immediately. Morphine is naturally produced by several plants (such as the opium poppy) and animals (PMID: 22578954). Morphine was first isolated between 1803 and 1805 by Friedrich Sertürner. Sertürner originally named the substance morphium after the Greek god of dreams, Morpheus, as it has a tendency to cause sleep. The primary source of morphine is isolation from poppy straw of the opium poppy. Morphine is also endogenously produced by humans. In the mid 2000s it was found morphine can be synthesized by white blood cells (PMID 22578954). CYP2D6, a cytochrome P450 isoenzyme, catalyzes the biosynthesis of morphine from codeine and dopamine from tyramine. The morphine biosynthetic pathway in humans occurs as follows: L-tyrosine -> para-tyramine or L-DOPA -> dopamine -> (S)-norlaudanosoline -> (S)-reticuline -> 1,2-dehydroretinulinium -> (R)-reticuline -> salutaridine -> salutaridinol -> thebaine -> neopinone -> codeinone -> codeine -> morphine. (S)-Norlaudanosoline (also known as tetrahydropapaveroline) which is an important intermediate in the WBC biosynthesis of morphine can also be synthesized from 3,4-dihydroxyphenylacetaldehyde (DOPAL), a metabolite of L-DOPA and dopamine. Morphine has widespread effects in the central nervous system and on smooth muscle (PMID: 4582903). The precise mechanism of the analgesic action of morphine is not fully known. However, specific CNS opiate receptors have been identified and likely play a role in the induction of analgesic effects. Morphine first acts on the mu-opioid receptors. The mechanism of respiratory depression involves a reduction in the responsiveness of the brain stem respiratory centers to increases in carbon dioxide tension and electrical stimulation. It has been shown that morphine binds to and inhibits GABA inhibitory interneurons. These interneurons normally inhibit the descending pain inhibition pathway. So, without the inhibitory signals, pain modulation can proceed downstream. When the dose of morphine is reduced after long-term use, opioid withdrawal symptoms such as drowsiness, vomiting, and constipation may also occur (PMID: 23244430). Morphine is only found in easily detectable quantities in individuals that have used or taken this drug.
D002491 - Central Nervous System Agents > D002492 - Central Nervous System Depressants > D009294 - Narcotics
D002492 - Central Nervous System Depressants > D009294 - Narcotics > D053610 - Opiate Alkaloids
C78272 - Agent Affecting Nervous System > C67413 - Opioid Receptor Agonist > C1657 - Opiate
N - Nervous system > N02 - Analgesics > N02A - Opioids > N02AA - Natural opium alkaloids
relative retention time with respect to 9-anthracene Carboxylic Acid is 0.056
relative retention time with respect to 9-anthracene Carboxylic Acid is 0.054
D018373 - Peripheral Nervous System Agents > D018689 - Sensory System Agents
D002491 - Central Nervous System Agents > D000700 - Analgesics
CONFIDENCE standard compound; EAWAG_UCHEM_ID 2744
CONFIDENCE standard compound; INTERNAL_ID 1580

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