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Related Concept Videos

Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

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In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
892
Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

955
Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is...
955
Antidotes01:17

Antidotes

718
Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...
718
Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

558
Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
558
Cholinergic Antagonists: Pharmacological Actions01:28

Cholinergic Antagonists: Pharmacological Actions

1.2K
Antimuscarinic drugs block muscarinic receptors in multiple systems, including the gut, eye, smooth muscles, respiratory tract, cardiovascular, and central nervous systems. They produce similar effects with varying selectivity depending on the specific agent and tissue. Here are the key pharmacological actions of antimuscarinics:
Gastrointestinal Effects: Antimuscarinics reduce gut contractions, increase gastric emptying, and slow intestinal transit. They partly inhibit gastric acid secretion...
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Cholinergic Antagonists: Pharmacokinetics01:24

Cholinergic Antagonists: Pharmacokinetics

535
Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
535

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Medical Countermeasures against Ricin Intoxication.

Christine Rasetti-Escargueil1, Arnaud Avril2

  • 1Unité des Bactéries Anaérobies et Toxines, Institut Pasteur, 25 Avenue du Docteur Roux, 75015 Paris, France.

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|February 24, 2023
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Summary

Ricin toxin, a deadly protein from castor beans, causes cell death and has potential bioweapon uses. Current research focuses on developing antibody-based therapies, chemical inhibitors, and vaccines as countermeasures against ricin intoxication.

Keywords:
antibodiesantitoxinmedical countermeasuresricinsmall-molecule inhibitorsvaccines

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Area of Science:

  • Toxicology
  • Biochemistry
  • Pharmacology

Background:

  • Ricin is a toxic glycoprotein from castor beans, composed of enzymatic A and cell-binding B chains.
  • It inhibits protein synthesis by targeting ribosomes, leading to cell death, inflammation, and DNA damage.
  • Historically used in traditional medicine, its toxicity and extractability make it a bioweapon concern.

Purpose of the Study:

  • To review current drug development for ricin intoxication countermeasures.
  • To highlight the potential of antibody-based therapies.
  • To explore alternative and combination therapies including chemical inhibitors, small proteins, and vaccines.

Main Methods:

  • Literature review of existing and developing countermeasures for ricin toxicity.
  • Analysis of proof-of-concept studies for antibody-based therapies.
  • Evaluation of alternative therapeutic strategies.

Main Results:

  • No specific treatment for ricin intoxication is currently available.
  • Antibody-based therapies show promise as a proof-of-concept.
  • Chemical inhibitors, small proteins, and vaccines are viable alternatives or adjuncts to antibody therapy.

Conclusions:

  • Developing effective countermeasures for ricin poisoning is a critical global health priority.
  • Multiple therapeutic avenues, including antibody-based treatments and other modalities, are under investigation.
  • Combination therapies may offer enhanced protection against ricin toxicity.