Spike Protein in the Brain: How It Contributes to Long COVID Symptoms

A recent study highlights that the SARS-CoV-2 spike protein can remain in brain-protective tissues and skull bone marrow for years after infection. This persistent spike protein may contribute to neurological symptoms seen in long COVID. Researchers found elevated spike protein levels in these areas, leading to chronic brain inflammation and a higher risk for neurodegenerative diseases.

The study was conducted by teams from Helmholtz Munich and Ludwig-Maximilians-Universität (LMU). They utilized advanced imaging techniques to analyze tissue samples from both COVID-19 patients and mice, uncovering that the spike protein could stay in the meninges and skull bone marrow for up to four years following infection.

Vaccination with mRNA COVID-19 vaccines, like the BioNTech/Pfizer vaccine, was shown to reduce spike protein accumulation by about 50%. However, even with vaccination, some spike protein can remain, which may still pose risks of chronic inflammation and accelerate brain aging, potentially resulting in a loss of five to ten years of healthy brain function.

The findings underscore the need for new therapies and early diagnostic tools focused on addressing the long-term effects of COVID-19 on brain health. The research offers insights into identifying the spike protein or related inflammatory markers using blood plasma or cerebrospinal fluid. These advances could lead to improved treatment approaches and support for those affected by long COVID.

Globally, a significant portion of the population has been infected with COVID-19, with a subset experiencing long COVID. This situation presents not only individual health challenges but also broader societal implications. As COVID-19 continues to affect many, uncovering how the virus impacts the brain is critical for developing effective strategies to mitigate its long-term consequences.

The research, published in the journal Cell Host & Microbe, sheds light on the pathways through which the spike protein impacts the nervous system. It emphasizes the necessity of ongoing studies to validate these findings in long COVID patients and explore effective therapeutic options.