Levistolide A Inhibits PEDV Replication via Inducing ROS Generation

Area of Science:

• Veterinary Virology
• Natural Product Chemistry

Background:

• Porcine epidemic diarrhea virus (PEDV) variant strains pose a significant threat to global swine production.
• Existing vaccines offer limited protection against emerging PEDV variants due to sequence diversity.
• Novel antiviral strategies are crucial for effective PEDV control.

Purpose of the Study:

• To investigate the antiviral potential of Levistolide A (LA), a natural product, against PEDV.
• To elucidate the mechanism of action of LA in inhibiting PEDV replication.

Main Methods:

• In vitro assessment of LA's effect on PEDV replication, viral RNA, and protein production.
• Analysis of LA's impact on PEDV attachment and cellular entry.
• Investigation of LA-induced reactive oxygen species (ROS) generation and endoplasmic reticulum (ER) stress.
• Use of N-acetylcysteine (NAC) to antagonize LA's effects.

Main Results:

• Levistolide A suppressed PEDV replication in a dose- and time-dependent manner.
• LA significantly reduced viral RNA and protein synthesis.
• LA inhibited PEDV attachment to and penetration of host cells.
• LA-induced ROS generation was critical for its antiviral activity, as demonstrated by NAC antagonism.
• LA stimulated ER stress, which contributed to the inhibition of PEDV replication.

Conclusions:

• Levistolide A exhibits potent antiviral activity against PEDV.
• The anti-PEDV mechanism of LA involves the induction of ROS generation and subsequent ER stress.
• LA represents a promising natural product for developing novel therapeutic strategies against PEDV infections.