Microglia control the spread of neurotropic virus infection via P2Y12 signalling and recruit monocytes through P2Y12-independent mechanisms

Neurotropic herpesviruses can establish lifelong infection in humans and contribute to severe diseases including encephalitis and neurodegeneration. However, the mechanisms through which the brain’s immune system recognizes and controls viral infections propagating across synaptically linked neurona...

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Bibliographic Details
Published in:Acta neuropathologica 2018-09, Vol.136 (3), p.461-482
Main Authors: Fekete, Rebeka, Cserép, Csaba, Lénárt, Nikolett, Tóth, Krisztina, Orsolits, Barbara, Martinecz, Bernadett, Méhes, Előd, Szabó, Bálint, Németh, Valéria, Gönci, Balázs, Sperlágh, Beáta, Boldogkői, Zsolt, Kittel, Ágnes, Baranyi, Mária, Ferenczi, Szilamér, Kovács, Krisztina, Szalay, Gergely, Rózsa, Balázs, Webb, Connor, Kovacs, Gabor G., Hortobágyi, Tibor, West, Brian L., Környei, Zsuzsanna, Dénes, Ádám
Format: Article
Language:English
Subjects:
Brain
Encephalitis
Health aspects
Immune clearance
Immune system
Infection control
Infections
Inflammation
Medicine
Medicine & Public Health
Microglia
Monocytes
Neurodegeneration
Neuroimaging
Neurons
Neurosciences
Nucleotides
Original Paper
Parenchyma
Pathology
Recruitment
Viral infections
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Summary:Neurotropic herpesviruses can establish lifelong infection in humans and contribute to severe diseases including encephalitis and neurodegeneration. However, the mechanisms through which the brain’s immune system recognizes and controls viral infections propagating across synaptically linked neuronal circuits have remained unclear. Using a well-established model of alphaherpesvirus infection that reaches the brain exclusively via retrograde transsynaptic spread from the periphery, and in vivo two-photon imaging combined with high resolution microscopy, we show that microglia are recruited to and isolate infected neurons within hours. Selective elimination of microglia results in a marked increase in the spread of infection and egress of viral particles into the brain parenchyma, which are associated with diverse neurological symptoms. Microglia recruitment and clearance of infected cells require cell-autonomous P2Y12 signalling in microglia, triggered by nucleotides released from affected neurons. In turn, we identify microglia as key contributors to monocyte recruitment into the inflamed brain, which process is largely independent of P2Y12. P2Y12-positive microglia are also recruited to infected neurons in the human brain during viral encephalitis and both microglial responses and leukocyte numbers correlate with the severity of infection. Thus, our data identify a key role for microglial P2Y12 in defence against neurotropic viruses, whilst P2Y12-independent actions of microglia may contribute to neuroinflammation by facilitating monocyte recruitment to the sites of infection.
ISSN:0001-6322
1432-0533
DOI:10.1007/s00401-018-1885-0