Pathogenic IgG from long COVID patients with neurological sequelae triggers sensitive but not cognitive impairments upon transfer into mice.
Article Title: Pathogenic IgG from long COVID patients with neurological sequelae triggers sensitive but not cognitive impairments upon transfer into mice.
PMID: 42053865
Plain-Language Summary
Long COVID refers to persistent symptoms following a COVID-19 infection. A subset of long COVID patients, termed 'neurological long COVID,' experiences ongoing neurological issues like brain fog and fatigue. This study aimed to investigate if antibodies (IgG) from long COVID patients with neurological symptoms could trigger similar symptoms in mice. By injecting these IgGs into mice, researchers found that the mice showed increased sensitivity to touch and temperature without affecting cognitive functions. The IgGs targeted sensory neurons in the peripheral nervous system, providing insights into the potential mechanisms of pain-related symptoms in long COVID.
Key Findings
- Pathogenic IgG from long COVID patients caused increased sensitivity to touch and temperature in mice.
- No cognitive impairments were observed in mice receiving these IgGs.
- The IgGs targeted peripheral sensory neurons and induced pain-related symptoms in the mice.
Study Type
This study used a mouse model to investigate the effects of IgG antibodies from long COVID patients with neurological symptoms on sensory functions.
What This Means (and Doesn’t Mean)
The findings highlight a potential role of autoimmune responses in causing neurological symptoms in long COVID patients. Understanding how antibodies impact sensory neurons may offer new avenues for managing pain-related symptoms in long COVID. However, the study's limitations, such as the need for further research and confirmation in human studies, should be acknowledged before directly translating these findings to patient care.
Source
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Article Excerpt
Approximately 30% of long COVID patients still experience neurological symptoms (brain fog, pain, chronic fatigue) more than 4 months after the onset of COVID-19. This condition, known as 'neurological long COVID', remains poorly understood and might be explained by a persisting autoimmune response against nervous-derived self-antigens.