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Related Experiment Video

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Facile Preparation of 4-Substituted Quinazoline Derivatives

Facile Preparation of 4-Substituted Quinazoline Derivatives

Published on: February 15, 2016

Modifying quinolone antibiotics yields new anxiolytics.

Timothy B C Johnstone¹, Derk J Hogenkamp, Leanne Coyne

¹Department of Pharmacology, College of Medicine, University of California, Irvine, California 92697, USA.

Nature Medicine

|December 3, 2003

Summary

Norfloxacin, a fluoroquinolone antibiotic, may cause anxiety and convulsions by affecting the gamma-aminobutyric acid (GABA) receptor complex. Modified versions, like compound 4, show anxiolytic effects without sedation.

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Area of Science:

Neuroscience
Pharmacology
Medicinal Chemistry

Background:

Fluoroquinolone antibiotics, such as norfloxacin, are associated with rare neurological side effects like anxiety and convulsions.
These effects are hypothesized to stem from the antagonism of gamma-aminobutyric acid (GABA) at the GABA(A) receptor complex (GRC).

Purpose of the Study:

To investigate the potential of modified fluoroquinolones as anxiolytic agents.
To explore selective potentiation of GABAergic neurotransmission without sedative side effects.

Main Methods:

Chemical modification of norfloxacin to create novel compounds.
Evaluation of compound 4 for its ability to potentiate GABA action, specifically targeting the alpha(2) subunit of the GRC.
Assessment of anxiolytic and sedative properties of compound 4 in preclinical models.

Main Results:

Modification of norfloxacin led to the development of compound 4.
Compound 4 demonstrated selective potentiation of GABAergic activity, particularly at the alpha(2) subunit.
Compound 4 exhibited anxiolytic effects without inducing sedation.

Conclusions:

Compound 4 represents a novel class of anxiolytic ligands.
Selective modulation of the GABA(A) receptor complex offers a potential therapeutic strategy for anxiety with reduced sedative liability.