Drug antioxidant effects. A basis for drug selection?

Area of Science:

• Biochemistry
• Pathology
• Pharmacology

Background:

• Free radicals are reactive species with unpaired electrons, constantly generated in the human body.
• Implicated in over 50 human diseases, free radical reactions contribute to pathology when antioxidant defenses are overwhelmed, leading to oxidative stress.
• Oxidative stress can damage cellular components like lipids, proteins, carbohydrates, and DNA.

Purpose of the Study:

• To review the role of free radicals and reactive oxygen species in human diseases.
• To discuss the available antioxidant defense systems and therapeutic agents.
• To evaluate the current and potential therapeutic efficacy of various antioxidants.

Main Methods:

• Literature review of free radical involvement in disease pathology.
• Analysis of endogenous and exogenous antioxidant mechanisms.
• Assessment of clinical trial data and preliminary results for antioxidant therapies.

Main Results:

• Oxidative stress is a common factor in disease, though its contribution varies.
• Many antioxidants exist, including superoxide dismutase (SOD), alpha-tocopherol, and ascorbic acid, but their therapeutic efficacy is often limited.
• Preliminary data suggest potential benefits for probucol, ebselen, and iron chelators, requiring further clinical validation. N-acetylcysteine warrants investigation in HIV-1 positive subjects.

Conclusions:

• While free radicals play a role in numerous diseases, current antioxidant therapies have shown limited success.
• Further controlled clinical trials are essential to confirm the efficacy of promising agents like probucol, ebselen, and iron chelators.
• Avoiding deficiencies in essential antioxidants like ascorbic acid and alpha-tocopherol is crucial.