Foot-and-mouth disease virus utilizes an autophagic pathway during viral replication

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Foot-and-mouth disease virus (FMDV), an Aphthovirus, replicates within host cells, inducing membrane rearrangements for viral replication complexes.
• The origin of these induced membranes is unclear, but autophagy benefits poliovirus replication, suggesting a similar role for other picornaviruses.

Purpose of the Study:

• To investigate the role of autophagy in the replication cycle of Foot-and-mouth disease virus (FMDV).
• To determine if modulating autophagy affects FMDV replication efficiency.

Main Methods:

• Confocal microscopy was employed to visualize the co-localization of viral proteins (2B, 2C, 3A, VP1) with autophagy markers (LC3, Atg5) and LAMP-1 in FMDV-infected cells.
• The impact of autophagy modulation (using rapamycin to induce, and 3-methyladenine or siRNAs to inhibit) on viral yield and replication was assessed.

Main Results:

• Co-localization of FMDV non-structural proteins (2B, 2C, 3A) with LC3 and structural protein VP1 with Atg5 was observed, indicating interaction with the autophagic pathway.
• Treatment with the autophagy inducer rapamycin significantly increased FMDV yield.
• Inhibition of the autophagosomal pathway using 3-methyladenine or small-interfering RNAs markedly decreased FMDV replication.

Conclusions:

• Autophagy plays a significant role in the replication of Foot-and-mouth disease virus (FMDV).
• Modulation of the autophagic pathway directly impacts FMDV replication efficiency, suggesting it as a potential target for antiviral strategies.