Equine herpesvirus type 1 (EHV-1) replication in primary murine neurons culture.

This research investigates the replication of two strains of Equine herpesvirus type 1 (EHV-1) in primary murine neuron cell cultures. The study underlines that both EHV-1 strains, known for causing significant issues in horse industries, can multiply in mouse neurons without the need for adaptation, and some neurons can survive this process and transmit the infection further.

Study Background

• The research focuses on EHV-1, a virus that leads to significant economic losses within the global horse industries due to instances of abortion, respiratory disease, and neurological illness.
• Instances of abortion due to EHV-1 have been frequently confirmed in Poland, but there have been no detailed studies concerning the neurological symptoms arising from the infection.
• The purpose of this study is to analyze how the infection of neurons with non-neuropathogenic strains progresses and interacts with the neurons.

Approach and Methodology

• Two EHV-1 strains, namely Jan-E and Rac-H, were studied in the context of murine primary neuron cell cultures. Both these strains were collected from aborted fetuses.
• Rac-H is a reference strain first isolated in 1959 by Woyciechowska, while Jan-E was isolated by Bańbura and colleagues in the year 2000.
• These strains were used to infect primary murine neuronal cell cultures, and specific changes observed in the morphology and integrity of the cell monolayer, commonly labelled as a cytopathic effect, were tracked.

Outcomes & Findings

• Post the infection of the neuronal cell cultures with either Jan-E or Rac-H strains, positive results of immunofluorescence, nPCR, and real-time PCR tests were obtained, indicating a high virus concentration within the neurons.
• The study concludes that both strains of EHV-1 have shown potential to replicate within neurons of murine origin without needing adaptation in vitro.
• Remarkably, some neurons exhibited resilience against the virus replication during primary infection and lived through the process.
• These survivors (eight weeks post-infection) continued to harbor EHV-1 and demonstrated a capacity to transmit the infection to other cells.

Implications

• The discovery that these EHV-1 strains were able to replicate in murine neurons has significant implications for the understanding of EHV-1, including the virus’s potential ability to affect other species beyond equines.
• The survival and further infection capabilities of some neurons post-infection suggest alternative avenues for the virus’s propagation and persistence, which may need to be taken into account in the development of treatment methods and preventative measures in the future.