Inflammation, Not Just Misfolded Proteins, might potentially be Key to Mad Cow and Neurodegenerative Diseases
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New research from the university of Alberta challenges long-held beliefs about prion diseases, suggesting chronic inflammation triggered by bacterial toxins plays a significant role – offering potential new avenues for prevention and treatment.
For decades, the prevailing theory surrounding devastating neurological conditions like bovine spongiform encephalopathy (BSE), commonly known as mad cow disease, centered on misfolded proteins called prions. However, groundbreaking research led by the University of Alberta is upending that understanding. The study reveals, for the first time, that prion-like brain diseases can be initiated without the presence of these infectious prions, pointing to a more complex interplay of factors.
A New culprit: Bacterial Endotoxins
instead of solely focusing on misfolded proteins, researchers identified lipopolysaccharide (LPS), a potent bacterial endotoxin, as a key instigator of brain damage resembling prion disease. “This fundamentally challenges the prevailing theory that these types of brain diseases are only about prions or similar misfolded proteins,” explains Burim Ametaj, a nutritional immunobiologist and lead author of the study.
The research demonstrates a multifaceted process where inflammation weakens the brain’s natural defenses, making cells vulnerable. This initial inflammation then allows normal proteins to misfold, mimicking the effects previously attributed solely to prions.
A Geographic Puzzle Solved?
The research also offers a potential clarification for the differing rates of BSE infection in England and Wales compared to Scotland. Ametaj suggests that rendering plants in England and wales, in an effort to cut costs, removed hexane from their production process. this solvent is critical not only for fat extraction but also for dissolving and removing LPS from meat-and-bone meal.
“Plants in England and Wales removed a critical substance called hexane from the production process to cut costs. This solvent was essential not only for fat extraction, but also for dissolving and removing LPS from the meat-and-bone meal,” Ametaj stated. “In contrast,Scottish rendering plants retained the hexane step and possibly as of that,had markedly fewer BSE cases – a fact long known but never systematically explained.”
Studies confirmed high levels of LPS contamination in meat-and-bone meal, blood meal, and tallow – the feed implicated in BSE.This contamination, combined with predisposing conditions in dairy cows like high-grain diets and increased intestinal permeability (“leaky gut”), could trigger systemic inflammation and contribute to neurodegenerative disease.
Implications for Human Health
The implications of this research extend far beyond livestock. Ametaj believes the findings could inform strategies for preventing and treating human neurodegenerative diseases like Alzheimer’s and Parkinson’s. “It opens up an entire anti-inflammatory medicine toolkit,” he says.
Bacterial endotoxins have been detected in the brains of Alzheimer’s patients, suggesting that lifestyle factors known to reduce dementia – such as exercise, anti-inflammatory diets, and gut health – may work, in part, by reducing endotoxin levels. “These diseases are complex, but if endotoxin exposure contributes to even 20 to 30 per cent of cases, controlling this modifiable risk factor could spare millions of people,” Ametaj adds. “We might prevent some neurodegenerative diseases the way we prevent heart disease, by managing inflammatory risk factors throughout life.”
The study underscores the importance of proper rendering processes and feed safety for livestock producers.Maintaining endotoxin-removal steps and monitoring contamination are crucial to preventing future outbreaks.
The research was conducted by a team including Seyed Ali Goldansaz, Dagnachew Hailemariam, Elda Dervishi, David Wishart, David Westaway, and researchers from the University of Warmia and Mazury in Poland. Funding was provided by the former Alberta Livestock and Meat Agency and the Alberta Prion Research Institute. In a field frequently enough characterized by limited hope, this research offers a promising new direction for tackling devastating neurological diseases.
