Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 22, 2026 1 hour, 27 minutes ago
Medical News: Researchers have found that propolis, a natural substance made by honey bees, may help protect blood vessels in the brain from inflammation and harmful tissue changes. The new study compared Brazilian green propolis and Polish brown propolis and discovered that both types can influence important immune signals, although each worked in a different way.
Bee-derived propolis may help shield brain blood vessels from inflammation and harmful tissue remodeling
The research was conducted by scientists from the Department of Microbiology and Immunology, Medical University of Silesia in Katowice, Poland, and the Institute of Chemistry, University of Opole, Poland.
Why Brain Blood Vessels Matter
The brain is protected by a highly specialized defense system known as the blood-brain barrier. This barrier controls what enters and leaves the brain and helps keep harmful substances out. When inflammation develops, this protective barrier can become damaged, contributing to neurological disorders and other health problems.
To investigate whether propolis could help, researchers exposed human brain microvascular endothelial cells, which form part of the blood-brain barrier, to extracts of Brazilian and Polish propolis under both normal oxygen and low-oxygen conditions. Low oxygen levels were used because they resemble the stressful conditions often seen in disease and injury.
Different Propolis Types Produced Different Effects
One of the most important findings was that neither propolis extract showed significant toxicity. Cell survival remained above internationally accepted safety thresholds, suggesting both extracts were well tolerated by brain endothelial cells.
The Polish propolis extract produced particularly strong anti-inflammatory effects under low-oxygen conditions. It dramatically reduced levels of TNF-alpha, a powerful inflammatory molecule that is known to contribute to blood-brain barrier damage and chronic inflammation. It also lowered levels of IL-8 and several forms of TGF-beta, proteins linked to tissue scarring and fibrosis.
Brazilian green propolis showed a different profile. It strongly increased the release of IL-6 and GM-CSF, molecules involved in immune regulation. While elevated IL-6 is often associated with inflammation, scientists noted that IL-6 can also play protective and adaptive roles depending on the biological context. Importantly, Brazilian propolis also reduced TGF-beta levels, suggesting potential anti-fibrotic benefits.
Potential Protection Against Tissue Damage
A particularly interesting discovery involved TGF-beta, a signaling molecule heavily involved in tissue remodeling and fibrosis. Excessive TGF-beta activity can contribute to long-term tissue damage and blood vessel dysfunction.
This
Medical News report highlights that both propolis extracts reduced TGF-beta activity, with Polish propolis showing the strongest suppression of TGF-beta1 and Brazilian propolis
showing especially strong effects against TGF-beta2 and TGF-beta3. These findings suggest that propolis may help limit harmful tissue remodeling while supporting healthier vascular function.
Researchers also observed that hypoxic, or low-oxygen, conditions appeared to make cells more responsive to propolis. In several experiments, the extracts not only protected cells but also enhanced their metabolic activity, indicating improved cellular resilience during stress.
Conclusions
The study demonstrates that propolis may have significant potential as a natural immunomodulatory agent capable of influencing inflammation and protecting blood vessel function in the brain. Although Brazilian and Polish propolis acted through different biological pathways, both showed encouraging effects on inflammatory signaling and fibrosis-related markers. The findings suggest that propolis could eventually become useful in conditions involving blood-brain barrier dysfunction, chronic inflammation, stroke, or neurodegenerative disease. However, larger studies and clinical investigations are still needed before any medical applications can be confirmed.
The study findings were published in the peer reviewed journal: Molecules.
https://www.mdpi.com/1420-3049/31/12/2164
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