Activation of neurotoxic A1‐reactive astrocytes by SFTS virus infection accelerates fatal brain damage in IFNAR1‐/‐ mice

• Published in: Journal of medical virology Vol. 96; no. 8; pp. e29854 - n/a
• Main Authors: Kim, Seon‐Hee, Choi, Ha Nyeoung, Jo, Min Gi, Lee, Bina, Kim, Young Jin, Seong, Hyemin, Song, Chieun, Yoo, Han Sol, Lee, Jeong Hyun, Seong, Daseul, Park, Hyun‐Jin, Roh, In‐Soon, Yang, Jinsung, Lee, Min Young, Kim, Hye Jung, Park, Sang Won, Kim, Mingyo, Kim, Seong Jae, Kim, Minkyeong, Kim, Hyun‐Jeong, Hong, Kyung‐Wook, Yun, Seung Pil
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01.08.2024
• Subjects: Animals; Astrocytes; Astrocytes - pathology; Astrocytes - virology; Brain - immunology; Brain - pathology; Brain - virology; Brain damage; Brain injury; Brain stem; Brain Stem - pathology; Brain Stem - virology; Bunyaviridae Infections - immunology; Bunyaviridae Infections - pathology; Bunyaviridae Infections - virology; Cell activation; Cell Death; CNS symptoms; Disease Models, Animal; Encephalitis; Infectious diseases; Mice; Mice, Inbred C57BL; Mice, Knockout; Mortality; Mortality risk; Nerves; neuroinflammation; Neurons - pathology; Neurons - virology; Neurotoxicity; Phlebovirus - genetics; Phlebovirus - pathogenicity; Phlebovirus - physiology; Receptor, Interferon alpha-beta - deficiency; Receptor, Interferon alpha-beta - genetics; Respiratory function; severe fever with thrombocytopenia syndrome (SFTS); Spinal cord; Spinal Cord - pathology; Spinal Cord - virology; Thrombocytopenia; viral infection; viral infection; astrocytes; neuroinflammation; severe fever with thrombocytopenia syndrome (SFTS); CNS symptoms
• ISSN: 0146-6615; 1096-9071; 1096-9071
• DOI: 10.1002/jmv.29854

Severe fever with thrombocytopenia syndrome (SFTS) has a high mortality rate compared to other infectious diseases. SFTS is particularly associated with a high risk of mortality in immunocompromised individuals, while most patients who die of SFTS exhibit symptoms of severe encephalitis before death. However, the region of brain damage and mechanisms by which the SFTS virus (SFTSV) causes encephalitis remains unknown. Here, we revealed that SFTSV infects the brainstem and spinal cord, which are regions of the brain associated with respiratory function, and motor nerves in IFNAR1‐/‐ mice. Further, we show that A1‐reactive astrocytes are activated, causing nerve cell death, in infected mice. Primary astrocytes of SFTSV‐infected IFNAR1‐/‐ mice also induced neuronal cell death through the activation of A1‐reactive astrocytes. Herein, we showed that SFTSV induces fatal neuroinflammation in the brain regions important for respiratory function and motor nerve, which may underlie mortality in SFTS patients. This study provides new insights for the treatment of SFTS, for which there is currently no therapeutic approach.