Low-Molecular-Weight Sulfated Chitosan Microparticles Efficiently Bind HIV-1 In Vitro: Potential for Microbicide...

Area of Science:

• Biomaterials Science
• Virology
• Nanotechnology

Background:

• Human Immunodeficiency Virus type 1 (HIV-1) presents a significant global health challenge, necessitating novel prevention strategies beyond antiretroviral therapy.
• Topical microbicides targeting early viral entry are crucial, as HIV-1 attachment involves interactions with host cell surface heparan sulfate proteoglycans.
• Sulfated chitosan microparticles are designed as biomimetic decoys, mimicking natural glycosaminoglycans to prevent viral attachment and entry.

Purpose of the Study:

• To synthesize and characterize low-molecular-weight sulfated chitosan (LMW Chi-S) microparticles.
• To evaluate the antiviral efficacy of LMW Chi-S microparticles against HIV-1.
• To compare the performance of LMW Chi-S microparticles with established heparinoid controls.

Main Methods:

• LMW Chi-S microparticles were synthesized and characterized using SEM, EDS, DLS, and FTIR.
• Antiviral activity was assessed by incubating microparticles with HIV-1-positive plasma to facilitate viral binding and removal.
• Comparative analysis was performed against soluble heparin and heparin microparticles.

Main Results:

• LMW Chi-S microparticles demonstrated superior virus-binding and neutralizing capacity compared to all heparinoid controls.
• A significant reduction in HIV-1 viral load was observed, reaching up to 70% with Chi-S microparticles, versus 53-60% with heparinoids.
• Consistent antiviral effects were noted across various tested concentrations, confirming robust virus-particle interactions.

Conclusions:

• LMW Chi-S microparticles exhibit potent antiviral properties against HIV-1.
• The synthesized microparticles outperform classical heparinoid materials in viral load reduction.
• These findings support the potential of LMW Chi-S microparticles as topical microbicides for blocking early HIV-1 entry mechanisms.