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SARS-CoV-2感染後に持続的な神経症状を患う12人を対象とした国立衛生研究所（NIH）の研究では、免疫細胞プロファイルと自律神経機能障害に違いがあることが判明した。 長期にわたる新型コロナウイルスの症状には、倦怠感、「脳霧」、睡眠障害などが含まれ、数か月間続く場合もあります。 この研究ではディープフェノタイピングを利用して臨床的および生物学的特徴を分析し、ロングコロナ患者のT細胞レベルの低下、B細胞数の増加、自律神経系の問題が判明した。 調査結果は、 神経学: 神経免疫学と神経炎症、ロングコロナウイルスの理解に貢献し、より良い診断と新しい治療法につながる可能性があります。
研究結果は生物学的メカニズムに関する洞察を提供し、可能な治療法を示しています。
12人のロングコロナ患者を対象としたNIHの研究では、免疫細胞プロファイルと自律神経機能障害の違いが発見され、症状の理解に貢献し、より良い診断と新しい治療法につながる可能性がある。
12人が治療後に持続的な神経症状を呈した[{” attribute=””>SARS-CoV-2 infection were intensely studied at the National Institutes of Health (NIH) and were found to have differences in their immune cell profiles and autonomic dysfunction. These data inform future studies to help explain persistent neurological symptoms in Long COVID. The findings, published in Neurology: Neuroimmunology & Neuroinflammation, may lead to better diagnoses and new treatments.
People with post-acute sequelae of COVID-19 (PASC), which includes Long COVID, have a wide range of symptoms, including fatigue, shortness of breath, fever, headaches, sleep disturbances, and “brain fog,” or cognitive impairment. Such symptoms can last for months or longer after an initial SARS-CoV-2 infection. Fatigue and “brain fog” are among the most common and debilitating symptoms, and likely stem from nervous system dysfunction.
Researchers used an approach called deep phenotyping to closely examine the clinical and biological features of Long COVID in 12 people who had long-lasting, disabling neurological symptoms after COVID-19. Most participants had mild symptoms during their acute infection. At the NIH Clinical Center, participants underwent comprehensive testing, which included a clinical exam, questionnaires, advanced brain imaging, blood and cerebrospinal fluid tests, and autonomic function tests.
The results showed that people with Long COVID had lower levels of CD4+ and CD8+ T cells—immune cells involved in coordinating the immune system’s response to viruses—compared to healthy controls. Researchers also found increases in the numbers of B cells and other types of immune cells, suggesting that immune dysregulation may play a role in mediating Long COVID.
Consistent with recent studies, people with Long COVID also had problems with their autonomic nervous system, which controls unconscious functions of the body such as breathing, heart rate, and blood pressure. Autonomic testing showed abnormalities in control of vascular tone, heart rate, and blood pressure with a change in posture. More research is needed to determine if these changes are related to fatigue, cognitive difficulties, and other lingering symptoms.
Taken together, the findings add to growing evidence that widespread immunological and autonomic nervous system changes may contribute to Long COVID. The results may help researchers better characterize the condition and explore possible therapeutic strategies, such as immunotherapy.
Reference: “Deep Phenotyping of Neurologic Postacute Sequelae of SARS-CoV-2 Infection” by Yair Mina, Yoshimi Enose-Akahata, Dima A. Hammoud, Anthony J. Videckis, Sandeep R. Narpala, Sarah E. O’Connell, Robin Carroll, Bob C. Lin, Cynthia Chen McMahan, Govind Nair, Lauren B. Reoma, Adrian B. McDermott, Brian Walitt, Steven Jacobson, David S. Goldstein, Bryan R. Smith and Avindra Nath, 5 May 2023, Neurology: Neuroimmunology & Neuroinflammation.
DOI: 10.1212/NXI.0000000000200097
The study was supported by the Intramural Research Program at the National Institute of Neurological Disorders and Stroke (NINDS) and is part of an observational study taking place at the NIH Clinical Center designed to characterize changes in the brain and nervous system after COVID-19 (NCT04564287).
This work is a part of the National Research Action Plan, a broader government-wide effort in response to the Presidential Memorandum directing the Secretary for the Department of Health and Human Services to mount a full and effective response to Long COVID. Led by Assistant Secretary for Health Admiral Rachel Levine, the Plan and its companion Services and Supports for Longer-term Impacts of COVID-19 report lay the groundwork to advance progress in prevention, diagnosis, treatment, and provision of services for individuals experiencing Long COVID.
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