Related Experiment Video

Updated: Aug 10, 2026

Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice
07:09

Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice

Published on: September 8, 2011

Disinhibition of muricide and irritability by intraseptal muscimol

M Potegal, B Yoburn, M Glusman

    Pharmacology, Biochemistry, and Behavior
    |October 1, 1983
    PubMed

    Insights

    Intraseptal muscimol significantly increases muricide (rat killing) and irritability in rats. This suggests that septal neurons controlling muricide are regulated by local GABAergic (gamma-aminobutyric acid) inhibition.

    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology
    • Neuroethology

    Background:

    • The septum region of the brain plays a role in regulating aggressive behaviors.
    • GABAergic (gamma-aminobutyric acid) neurotransmission is crucial for inhibitory processes in the brain.
    • Previous research suggests electrical stimulation of the septum can inhibit muricide.

    Purpose of the Study:

    • To investigate the role of GABAergic neurotransmission within the septum in the regulation of muricide.
    • To determine the effects of specific pharmacological agents on aggressive behaviors and general activity.

    Main Methods:

    • Administered muscimol, a GABA receptor agonist, directly into the septum of rats.
    • Administered thiosemicarbazide, a GABA synthesis inhibitor, at different septal locations.
    • Observed effects on muricide, irritability, general activity, and chocolate chip acceptance.

    Main Results:

    • Intraseptal muscimol significantly facilitated muricide and increased irritability, but did not affect general activity or appetite.
    • Thiosemicarbazide's effects on muricide latency varied based on injection site within the septum.
    • Serotonergic agents (quipazine, metergoline) had no significant impact on these behaviors.

    Conclusions:

    • Septal neurons involved in inhibiting muricide are under local GABAergic control.
    • Inhibition of these septal neurons, via muscimol, leads to disinhibition and facilitation of muricide.
    • These findings highlight the specific role of GABAergic signaling in the septal regulation of aggression.

    More Related Videos

    Microinjectrode System for Combined Drug Infusion and Electrophysiology08:30

    Microinjectrode System for Combined Drug Infusion and Electrophysiology

    Published on: November 13, 2019

    Efficient Method for Imaging Murine Lungs that Preserves Spatial Dynamics of Fungal Spores in the Airways10:06

    Efficient Method for Imaging Murine Lungs that Preserves Spatial Dynamics of Fungal Spores in the Airways

    Published on: December 13, 2024

    Related Concept Videos

    Cholinergic Receptors: Muscarinic01:25

    Cholinergic Receptors: Muscarinic

    The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
    The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+. Activation...
    Cholinergic Antagonists: Pharmacokinetics01:24

    Cholinergic Antagonists: Pharmacokinetics

    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 the conjunctiva.
    Cholinergic Antagonists: Pharmacological Actions01:28

    Cholinergic Antagonists: Pharmacological Actions

    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...
    Cholinergic Antagonists: Therapeutic Uses01:26

    Cholinergic Antagonists: Therapeutic Uses

    Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
    Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal secretions in common...