Opioid Dependence
Opioid Dependence - Related Videos
01:15
Opioid Analgesics: Synthetic and Semisynthetic Opioids
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2024
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...
01:22
Opioid Receptors: Overview
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2024
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, D-Pen5]-enkephalin or DPDPE for...
01:17
Drugs Affecting GI Tract Motility: Opioids as Antidiarrheal Agents
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2024
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. Opioids, widely used antidiarrheal agents, mitigate diarrhea by slowing down...
09:54
Combining Laser Capture Microdissection and Microfluidic qPCR to Analyze Transcriptional Profiles of Single Cells: A Systems Biology Approach to Opioid Dependence
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Cited by 9 •
2020
This protocol explains how to collect single neurons, microglia, and astrocytes from the central nucleus of the amygdala with high accuracy and anatomic specificity using laser capture microdissection. Additionally, we explain our use of microfluidic RT-qPCR to measure a subset of the transcriptome of these cells.
01:20
Opioid Analgesics: Morphine and Other Natural Cogeners
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2024
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...
FAQs
Repeated stimulation of μ-opioid receptors does more than suppress neuronal signaling during drug exposure. Continued receptor activation drives compensatory changes across reward, stress, and autonomic pathways, reducing the system’s responsiveness to opioid effects. When stimulation falls, those adaptations are no longer offset, helping explain why withdrawal emerges after stopping or reducing exposure.
The timing of receptor stimulation is central to opioid dependence. During ongoing exposure, altered signaling is maintained by the drug; after exposure declines, the same compensatory state becomes physiologically destabilizing. This transition links pharmacological changes at μ-opioid receptors with withdrawal symptoms and provides a mechanistic basis for studying dependence in the central nervous system.
Physical dependence describes an adaptive physiological state associated with repeated exposure and withdrawal after reduction or cessation. Opioid use disorder is a separate clinical concept, so the presence of dependence alone should not be treated as a complete description of a person’s condition. This distinction guides safer interpretation and treatment decisions.
These medications are used to stabilize opioid signaling rather than allowing repeated fluctuations in receptor stimulation. In the context of dependence, that stabilization can support treatment decisions by reducing the physiological disruption associated with changing opioid exposure. Their role illustrates how pharmacology can target the signaling system affected by repeated opioid administration.
Naloxone is important when opioid effects produce respiratory depression, because it can rapidly reverse that opioid-induced effect. Its role differs from medications that stabilize ongoing opioid signaling: naloxone addresses an acute safety problem, whereas methadone and buprenorphine are discussed in relation to longer-term stabilization. This distinction helps organize clinical applications.
Pharmacology connects μ-opioid receptor activity with changes in neuronal signaling and with adaptations in reward, stress, and autonomic pathways. That framework supports safer treatment decisions, clarifies why withdrawal follows reduced exposure, and links laboratory study to clinical care and public health. It also helps explain why both stabilization and rapid reversal strategies matter.