Related Experiment Video
Updated: May 13, 2026

10:13
Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
Published on: June 9, 2017
[Naloxone]
Daisuke Setoguchi1, Yasuyuki Kakihana
1Department of Emergency & Intensive Care Medicine, Kagoshima University Hospital, Kagoshima 890-8520.
Summary
Naloxone hydrochloride antagonizes opioid effects, aiding addiction treatment and preventing spinal cord ischemia. Further research is needed for its use in septic shock.
Area of Science:
- Pharmacology
- Neuroscience
Context:
- Opioid receptors
- Micro-receptor
- Respiratory depression
- Analgesic actions
Purpose:
- To review the multifaceted applications of Naloxone hydrochloride.
- To highlight its role in opioid antagonism and addiction treatment.
- To explore its potential in spinal cord ischemia and septic shock.
Summary:
- Naloxone hydrochloride competitively acts at opioid receptors, antagonizing opioid-induced respiratory depression and analgesia.
- It exhibits high affinity, particularly for micro-receptors, making it crucial for basic research on opioid receptor antagonism.
- Naloxone is a guideline-recommended analeptic for opioid addiction and shows promise in preventing/treating spinal cord ischemia.
Impact:
- Naloxone is vital for managing opioid overdose and addiction.
- Its role in spinal cord ischemia prevention and treatment is established.
- Further clinical trials are necessary to validate its vasopressor effects in septic shock for broader clinical use.
Related Concept Videos
Opioid Analgesics: Synthetic and Semisynthetic Opioids
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...
Opioid Receptors: Overview
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...
Drug-Receptor Interaction: Antagonist
An antagonist is a drug that binds strongly to a receptor without activating it. An antagonist prevents other molecules, such as neurotransmitters or hormones, from binding to the receptor and triggering a cellular response. Such interaction effectively hinders the normal physiological processes mediated by the receptor, resulting in various pharmacological effects depending on the specific receptor targeted.
Antagonists can be classified as competitive or noncompetitive based on their...
Antagonists can be classified as competitive or noncompetitive based on their...
Drug Delivery: Enteral Route
The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
Drugs in...
Drugs in...
Pharmaceutical Poisoning: Treatment Strategies
Treatment strategies for poisoning are a critical aspect of emergency medicine, focusing on preventing the absorption of toxins and enhancing their elimination. When a poisoning incident occurs, the first response is to halt exposure and decontaminate the patient, particularly through gastrointestinal (GI) methods if the poison was ingested.Gastrointestinal Decontamination Techniques:Activated charcoal is the cornerstone of GI decontamination. It works through adsorption, binding the toxin to...
Opioid Analgesics: Morphine and Other Natural Cogeners
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...

