Porcine Erythrocyte-PRRSV Interactions: Implications for Targeted Nanodrug Delivery

Area of Science:

• Veterinary Virology
• Nanomedicine
• Immunology

Background:

• Porcine reproductive and respiratory syndrome virus (PRRSV) poses a significant threat to the swine industry.
• Understanding PRRSV infection mechanisms is crucial for developing effective control strategies.
• Erythrocytes play a role in immune responses and pathogen interactions.

Purpose of the Study:

• To establish a CR1-like-mediated targeted nanodrug delivery system for PRRSV.
• To investigate the interactions between porcine erythrocytes, PRRSV, and nanodrugs.
• To evaluate the efficacy of matrine nanoliposomes for PRRSV control.

Main Methods:

• Determined optimal conditions for PRRSV sensitization with porcine serum.
• Verified CR1-like-dependent immune adhesion of erythrocytes to PRRSV using microscopy and molecular techniques.
• Assessed the impact of this adhesion on PRRSV infection of porcine alveolar macrophages (PAMs).
• Prepared and characterized mannose-modified matrine nanoliposomes (MMLNPs) for in vitro evaluation.

Main Results:

• PRRSV sensitization was optimized under specific conditions (37°C, 2h).
• Porcine erythrocytes demonstrated specific CR1-like-mediated adhesion to sensitized PRRSV, enhancing PAM infection.
• Developed MMLNPs were stable, non-cytotoxic, and targeted PAMs via CR1-like.
• MMLNPs exhibited superior in vitro antiviral activity compared to free matrine.

Conclusions:

• CR1-like-mediated immune adhesion is a key mechanism in PRRSV infection of PAMs.
• Targeting this natural pathway allows for efficient delivery of nanodrugs to infected cells.
• This approach offers a promising strategy for developing novel PRRSV therapeutics.