Viruses combine with proteins in the biological fluids of their host and end up in a layer of proteins on the viral surface. This protein coated viruses can be more infectious as it facilitates the formation of plaques, characteristic of neurodegenerative diseases like Alzheimer's disease. The findings of the study are published in the journal Nature Communications.
Are viruses dead or alive? Well... both.
Viruses can only reproduce inside living cells and exploit the cellular machinery of their host to their benefit. However, before entering a host cell, viruses are just nanometer-sized particles, very similar to artificial nanoparticles used in medical applications for diagnosis and therapy.
"Imagine a tennis ball falling into a bowl of milk and cereals. The sticky particles in the mix immediately cover the ball, and they remain on the ball when you take it out of the bowl. The same thing happens when a virus gets in contact with blood or lung fluids that contain thousands of proteins. Many of these proteins immediately stick to the viral surface forming a so-called protein corona", Kariem Ezzat of Stockholm University and Karolinska Institutet explains.
Kariem Ezzat and his colleagues studied the protein corona of respiratory syncytial virus (RSV) in different biological fluids. RSV is the most common cause of acute lower respiratory tract infections in young children worldwide, leading up to 34 million cases and 196,000 fatalities each year.
"The protein corona signature of RSV in the blood is very different from that in lung fluids. It is also different between humans and other species such as rhesus macaque monkeys, which also can be infected with RSV", Kariem Ezzat says.
"The virus remains unchanged on the genetic level. It just acquires different identities by accumulating different protein coronae on its surface depending on its environment. This makes it possible for the virus to use extracellular host factors for its benefit, and we've shown that many of these different coronae make RSV more infectious."
The researchers from Stockholm University and Karolinska Institutet have also found that viruses such as RSV and herpes simplex virus type 1 (HSV-1) can bind a special class of proteins called amyloid proteins.
Amyloid proteins aggregate into plaques that play a part in Alzheimer's disease where they lead to neuronal cell death. The mechanism behind the connection between viruses and amyloid plaques has been hard to find till now, but Kariem Ezzat and his colleagues found that HSV-1 can accelerate the transformation of soluble amyloid proteins into threadlike structures that constitute the amyloid plaques. In animal models of Alzheimer's disease, they saw that mice developed the disease within 48 hours of infection in the brain. In the absence of HSV-1 infection, the process normally takes several months.
"The novel mechanisms described in our paper can have an impact not only on understanding new factors determining how infectious a virus is but also on devising new ways to design vaccines. Also, describing a physical mechanism that links viral and amyloid causes of disease adds weight to the increasing research interest in the role of microbes in neurodegenerative disorders such as Alzheimer's disease and opens up new avenues for treatments.", Kariem Ezzat of Stockholm University and Karolinska Institutet says.