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Opioid Analgesics: Synthetic and Semisynthetic Opioids01:15

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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
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Tetrahydrocannabinol (THC) is a phytocannabinoid that primarily interacts with the CB1 receptor, a type of G protein-coupled receptor (GPCR) predominantly in and around the chemoreceptor trigger zone (CTZ) and emetic center. THC also blocks the serotonin receptor activity in the dorsal vagal complex (DVC) by inhibiting serotonin release. THC exerts its anti-emetic effects through these interactions, which are beneficial for patients undergoing chemotherapy.
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Analgesia and Pain Management01:25

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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Diarrhea, a condition marked by frequent loose or watery bowel movements, can be triggered by multiple factors such as viral or bacterial infections, food intolerances, anxiety, medications, and digestive disorders. Symptoms may include abdominal pain, bloating, nausea, and cramping. Severe or prolonged diarrhea can lead to complications like electrolyte imbalances, malnutrition, and dehydration if left untreated.
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Opioids and cancer recurrence.

Rohit Juneja1

  • 1The Royal Marsden Hospital NHS Foundation Trust, London, UK.

Current Opinion in Supportive and Palliative Care
|April 25, 2014
PubMed
Summary

The impact of opioids like morphine on cancer metastasis is unclear, with some studies suggesting harm and others potential benefit. Further research is needed to determine their role in cancer progression and patient outcomes.

Area of Science:

  • Oncology
  • Pharmacology
  • Pain Management

Background:

  • Cancer metastasis is a leading cause of cancer-related deaths.
  • Opioids, particularly morphine, are widely used for cancer pain management.
  • Previous in-vitro and animal studies suggest morphine may promote cancer metastasis, but human data is inconclusive.

Purpose of the Study:

  • To explore the mechanisms by which opioids influence cancer cell behavior.
  • To evaluate the potential harm of opioids in cancer patients.
  • To review the current evidence on the relationship between opioid use and cancer metastasis.

Main Methods:

  • Review of in-vitro and animal studies on opioid effects on cancer cells.
  • Analysis of human retrospective data regarding opioid use and cancer outcomes.

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  • Discussion of the role of the μ-opioid receptor (MOR) in cancer.

    • Main Results:

    • Evidence on morphine's effect on cancer metastasis in humans is inconclusive.
    • Some studies suggest morphine may benefit certain cancer cell types.
    • Regional anesthesia techniques (opioid-sparing) show potential benefits in surgical cancer patients, but the direct role of opioid avoidance is unclear.
    • The μ-opioid receptor (MOR) is implicated in cancer progression, and its elucidated crystal structure may offer new therapeutic targets.

    Conclusions:

    • The role of opioids in cancer metastasis and recurrence is complex and cancer-type dependent.
    • Prospective randomized controlled trials are ongoing to clarify the human data.
    • Effective pain management, including appropriate analgesia with opioids, is crucial for minimizing the negative impact of pain on the immune system in cancer patients.