Oxidative stress and the antioxidant enzyme system in the developing brain

Area of Science:

• Neonatal physiology
• Neuroscience
• Biochemistry

Background:

• Preterm infants exhibit vulnerability to oxidative stress, characterized by excessive free radical production and underdeveloped antioxidant defenses.
• Reactive oxygen species (ROS), including superoxide, hydroxyl radical, and hydrogen peroxide, are implicated in the pathogenesis of periventricular leukomalacia.
• A delicate balance between ROS generation and antioxidant enzyme capacity is crucial for cellular health; disruption leads to toxic effects.

Purpose of the Study:

• To review the role of oxidative stress and antioxidant systems in preterm infants.
• To discuss the involvement of various reactive oxygen species (ROS) in periventricular leukomalacia.
• To explore the function of classical and novel antioxidant enzymes, such as peroxiredoxins (Prdx), in mitigating oxidative damage.

Main Methods:

• Literature review of studies on oxidative stress in preterm neonates.
• Analysis of the biochemical pathways involving ROS and antioxidant enzymes.
• Examination of the expression patterns of Prdx family members (Prdx1, Prdx2, Prdx6).

Main Results:

• Oxidative stress significantly impacts preterm infants due to immature antioxidant systems and high free radical production.
• Specific ROS are identified as critical in the development of periventricular leukomalacia.
• Peroxiredoxins (Prdx) represent a significant class of free radical scavengers, with distinct expression profiles (Prdx1 induced, Prdx2 constitutive, Prdx6 consistent with classical enzymes).

Conclusions:

• Understanding the interplay between ROS and antioxidant enzymes is vital for preterm infant neuroprotection.
• While several antioxidant substances show therapeutic potential, further rigorous preclinical and clinical validation is necessary before widespread application.