Related Experiment Video
Updated: Jul 2, 2026
05:10
Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System
Published on: December 11, 2016
AZT: an old drug with new perspectives
Gabriele D'Andrea1, Fabrizia Brisdelli, Argante Bozzi
1Department of Biomedical Sciences and Technologies, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy.
Current Clinical Pharmacology
|August 12, 2008
Summary
Azidothymidine (AZT) effectively treats HIV but causes bone marrow toxicity by affecting iron metabolism and protein glycosylation. Novel delivery methods aim to improve its efficacy and reduce side effects.
Area of Science:
- Antiviral research
- HIV/AIDS treatment
- Toxicology
Background:
- Antiviral research was advanced when HIV/AIDS emerged.
- Azidothymidine (AZT) was the first effective HIV antiviral.
- AZT remains crucial in combined HIV therapy.
Purpose of the Study:
- Summarize AZT's effects, including toxic side effects.
- Investigate AZT's impact on iron metabolism and glycosylation.
- Explore AZT's potential in proteomics and novel delivery strategies.
Main Methods:
- Assessed AZT's iron chelation capacity (AZTTP form).
- Analyzed transferrin receptor expression and endocytosis in AZT-exposed cells.
- Evaluated effects on protein and lipid sialylation and glycosyltransferase activities.
- Tested AZT's interaction with saporin toxicity.
- Identified gene and protein expression changes in AZT-treated cells.
Main Results:
- AZT triphosphate (AZTTP) chelates iron from transferrin.
- AZT increases transferrin receptors and slows endocytosis.
- AZT impairs protein/lipid sialylation and alters glycosyltransferase activities.
- AZT enhances, not inhibits, saporin cytotoxicity.
- AZT alters expression of PDI-A3, sthatmin, HSP-60, and SOD1.
Conclusions:
- AZT's toxicity stems from iron dysregulation and altered glycosylation.
- AZT's effects on cellular processes have clinical relevance.
- AZT shows potential as a proteomics tool.
- Novel delivery systems may enhance AZT efficacy and bioavailability.
Related Concept Videos
01:28Drug Therapy
The advent of drug therapy has profoundly shaped modern mental health care, providing targeted treatments for a range of psychological disorders. Psychotherapeutic drugs, classified into antianxiety, antidepressant, and antipsychotic medications, address symptoms across anxiety disorders, mood disorders, and schizophrenia. While these medications have transformed patient outcomes, they require careful management due to their potential side effects and limitations.
Antianxiety Medications
Antianxiety Medications
01:15Drug Abuse and Addiction: Pharmacological Phenomena
Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...
01:30Combined Effects of Drugs: Antagonism
The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
01:24Principles 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...
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...
01:26Drug Discovery: Overview
Drug discovery is a multifaceted process involving extensive screening, testing, and optimization of lead compounds to identify potential new drugs for therapeutic use. It combines several approaches, including screening large numbers of natural products, chemical modification of known active molecules, identification of new drug targets, and rational design based on biological mechanisms and drug-receptor structure. These approaches are carried out in both academic research laboratories and...
01:27Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...