Nikhil Prasad Fact checked by:Thailand Medical News Team May 14, 2026 35 minutes ago
Medical News: Scientists are uncovering how a little-known group of brain proteins called peroxiredoxins may play a much bigger role in neurological diseases than previously believed. Once thought to act only as simple antioxidant “cleaners,” these proteins are now being linked to brain development, neuron survival, memory, inflammation, and even devastating conditions such as Alzheimer’s disease, Parkinson’s disease, and stroke.
Scientists discover that peroxiredoxin proteins may play crucial roles in brain development, memory, and
neurodegenerative diseases
Researchers from the BK21 FOUR KNU Creative BioResearch Group and the School of Life Sciences & Biotechnology at Kyungpook National University in Daegu, Republic of Korea, conducted a major review exploring how these proteins influence brain health and disease progression.
Tiny Molecules with Massive Importance
The human brain constantly produces unstable molecules known as reactive oxygen species, or ROS. In small amounts, these molecules help brain cells communicate and function normally. But when ROS levels rise too high, they can damage cells, proteins, and DNA.
Peroxiredoxins, often shortened to Prdxs, are a family of six proteins that help keep these dangerous molecules under control. However, the new review shows that these proteins are not simply acting as antioxidants. Instead, they appear to function as highly specialized regulators inside different parts of the brain.
Some versions of these proteins protect mitochondria, the energy-producing structures inside cells. Others help maintain the endoplasmic reticulum, a critical system involved in protein folding and stress control. Certain forms even influence how brain cells develop and mature.
How These Proteins Shape Brain Development
One of the most fascinating findings is that peroxiredoxins are deeply involved in the formation of neurons during brain development.
The researchers found that Prdx1 helps nerve cells mature by carefully controlling oxidation levels inside developing neurons. Another protein, Prdx4, regulates the timing of motor neuron formation by controlling a molecule called GDE2, which is essential for switching immature brain cells into mature neurons.
Meanwhile, Prdx6 appears to act differently. Instead of encouraging neuron formation, it may actually slow down neurogenesis, especially in neural stem cells. Scientists believe this happens through interference with important signaling pathways involved in brain cell growth.
This
Medical News report highlights how the balance between different peroxiredoxin proteins may determine whether brain cells survive, develop normally, or become vulnerable to disease.
Protective Role in Alzheimer’s Disease
The review revealed strong evidence that several peroxiredoxins may help defend the brain against Alzheimer’s disease
.
Prdx5 was shown to reduce harmful oxidative stress caused by amyloid-beta proteins, which are strongly linked to Alzheimer’s plaques. It also helped stabilize mitochondria and reduced toxic signaling pathways that normally trigger neuron death.
Prdx1 also demonstrated protective effects by preventing mitochondrial damage and improving the transport system inside neurons. This is important because disrupted transport mechanisms are commonly seen in Alzheimer’s patients.
However, the role of Prdx6 appears more complicated. In some studies, it reduced inflammation and improved the brain’s ability to clear harmful amyloid proteins. In other models, excessive Prdx6 activity appeared to worsen oxidative stress and memory decline. Scientists now believe its effects depend heavily on disease stage, cell type, and surrounding brain conditions.
Parkinson’s Disease and Mitochondrial Damage
The review also explored how these proteins influence Parkinson’s disease, a condition strongly linked to oxidative stress and mitochondrial dysfunction.
Prdx2 and Prdx3 were found to protect dopamine-producing neurons from damage. Prdx3 was especially important because it operates inside mitochondria, where large amounts of harmful ROS are generated.
But in Parkinson’s disease, mutations involving the LRRK2 gene can chemically alter Prdx3, weakening its protective abilities. This allows oxidative damage to build up more rapidly, accelerating the loss of dopamine-producing neurons.
Researchers say this discovery may open the door for therapies aimed at restoring or protecting Prdx3 function.
Stroke and Brain Inflammation
The study also found that peroxiredoxins play a double-edged role in stroke.
Inside brain cells, some Prdx proteins protect tissues from oxidative injury and reduce inflammation. But once released outside damaged cells after a stroke, certain peroxiredoxins can act like danger signals that trigger severe immune reactions.
Prdx6 was identified as a major driver of inflammatory responses after stroke. It appears to activate immune cells called microglia, worsening brain swelling and tissue injury.
Scientists believe future treatments may need to preserve the protective effects of these proteins while blocking their harmful inflammatory actions.
Conclusions
The findings from this extensive review suggest that peroxiredoxins are far more important to brain health than scientists once imagined. Rather than acting as simple antioxidant defenders, these proteins function as highly specialized regulators that influence neuron formation, mitochondrial stability, inflammation, memory, and responses to injury. Their behavior changes depending on the type of brain cell involved, their location inside the cell, and the stage of disease progression. Researchers believe these proteins could eventually become valuable therapeutic targets for Alzheimer’s disease, Parkinson’s disease, stroke, and other neurological disorders. However, more research is still needed to fully understand how to manipulate these proteins safely without interfering with their essential protective functions in the healthy brain.
The study findings were published in the peer reviewed journal: Antioxidants.
https://www.mdpi.com/2076-3921/15/5/604
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https://www.thailandmedical.news/articles/alzheimer,-dementia-
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