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Sedatives and Hypnotics Drugs: Benzodiazepines

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In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines

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Alprazolam intercalates into DNA.

Biswarup Saha¹, Ananda Mukherjee, Chitta Ranjan Santra

¹Department of Life Science and Biotechnology, Jadavpur University, Kolkata-700032, W. B, India.

Journal of Biomolecular Structure & Dynamics

|December 26, 2008

Summary

Alprazolam (Alp), a common tranquilizer, strongly binds to DNA, potentially altering its structure and function. This interaction raises concerns about the widespread use of this benzodiazepine drug.

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CD Spectroscopy to Study DNA-Protein Interactions

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Published on: February 10, 2022

Area of Science:

Molecular Biology
Pharmacology
Biophysics

Background:

Benzodiazepines, including Alprazolam (Alp), are widely prescribed hypnotics and tranquilizers.
Understanding drug-DNA interactions is crucial for assessing potential cellular effects and therapeutic safety.

Purpose of the Study:

To investigate the in vitro interaction between Alprazolam and supercoiled plasmid DNA.
To elucidate the binding mode and biophysical consequences of Alprazolam-DNA complex formation.

Main Methods:

Absorption spectrophotometry to determine binding affinity.
Spectrofluorometry to assess DNA intercalation.
Circular dichroism spectroscopy for conformational changes.
Thermal denaturation and gel electrophoresis to evaluate DNA stability and structure.
Transmission electron microscopy for structural visualization.

Main Results:

Alprazolam exhibited strong binding to pUC 19 DNA with a binding constant of 8.245x10(3) M(-1).
Alprazolam displaced ethidium bromide but did not interfere with Hoechst 33258 binding, suggesting groove binding is not the primary mode.
Circular dichroism indicated DNA intercalation and conformational changes at higher Alp concentrations.
DNA thermal stability increased by 6°C, and gel electrophoresis/TEM revealed DNA structural compaction.

Conclusions:

Alprazolam demonstrates significant in vitro interaction with DNA, involving intercalation and structural modification.
The observed DNA binding and conformational changes warrant further investigation into the implications for Alprazolam's clinical use and potential genotoxicity.