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Related Concept Videos

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

Cholinergic Antagonists: Chemistry and Structure-Activity Relationship

Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic antagonists are called...
Anthelminthic Agents01:15

Anthelminthic Agents

Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
Principles of Drug Action01:24

Principles of Drug Action

Drugs are chemical substances that modify biological responses by interacting with macromolecular targets such as receptors, ion channels, transporters, and enzymes. Pharmacodynamics describes the course of action of drugs leading to the physiological effect at a specific site in the body.
Drugs can be agonists or antagonists. Like the endogenous ligands, agonists always bind and activate the target to produce a cellular response. Agonist binding induces a conformational change which in turn...
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...

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Related Experiment Video

Updated: May 7, 2026

Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses
10:25

Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses

Published on: November 3, 2014

Novel active principles from spider venom.

Alexander A Vassilevski, Eugene V Grishin

    Acta Chimica Slovenica
    |September 25, 2013
    PubMed
    Summary

    This review explores novel spider venom components, detailing new molecular structures and unique biological targets. Discover the expanding universe of spider toxins and their mechanisms of action.

    Area of Science:

    • Biochemistry
    • Toxicology
    • Molecular Biology

    Background:

    • Spider venom is a complex mixture containing diverse bioactive compounds.
    • The known spider toxin universe continues to expand with ongoing research.

    Purpose of the Study:

    • To review recent advancements in understanding spider venom.
    • To highlight novel structural and functional aspects of spider toxins.

    Main Methods:

    • Literature review of recent scientific publications.
    • Analysis of novel molecular structures and their biological activities.

    Main Results:

    • Identification of new classes of molecules within spider venom.
    • Discovery of novel biological targets and mechanisms of action for spider toxins.

    More Related Videos

    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
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    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects

    Published on: April 21, 2018

    Captive Maintenance and Venom Extraction of Tityus serrulatus (Brazilian Yellow Scorpion) for Antivenom Production
    05:27

    Captive Maintenance and Venom Extraction of Tityus serrulatus (Brazilian Yellow Scorpion) for Antivenom Production

    Published on: October 6, 2023

    Related Experiment Videos

    Last Updated: May 7, 2026

    Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses
    10:25

    Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses

    Published on: November 3, 2014

    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
    09:45

    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects

    Published on: April 21, 2018

    Captive Maintenance and Venom Extraction of Tityus serrulatus (Brazilian Yellow Scorpion) for Antivenom Production
    05:27

    Captive Maintenance and Venom Extraction of Tityus serrulatus (Brazilian Yellow Scorpion) for Antivenom Production

    Published on: October 6, 2023

    Conclusions:

    • Spider venom research is revealing unprecedented molecular diversity.
    • Novel toxins offer insights into biological processes and potential therapeutic applications.