Poly(lactic-co-glycolic) acid nanoparticles localize in vesicles after diffusing into cells and are retained by...

Area of Science:

• Nanomedicine
• Cell Biology
• Pharmacology

Background:

• Poly(lactic-co-glycolic) acid nanoparticles (PLGA-NPs) are widely used drug delivery vehicles.
• Understanding and controlling intracellular nanoparticle retention is crucial for optimizing therapeutic efficacy.
• Previous studies indicated that metabolic inhibitors (MI) can increase PLGA-NP retention.

Purpose of the Study:

• To investigate the effect of metabolic inhibitors (MI) on poly(lactic-co-glycolic) acid nanoparticle (PLGA-NP) retention.
• To explore how small molecule inhibitors influence PLGA-NP assimilation and intracellular accumulation.
• To elucidate the cellular mechanisms governing PLGA-NP movement and retention.

Main Methods:

• Confocal microscopy was employed to assess intracellular PLGA-NP colocalization in the presence of metabolic inhibitors (MI).
• Pulse/Chase experiments combined with fluorescence microscopy and flow cytometry were used to quantify intracellular PLGA-NP retention influenced by small molecule inhibitors.

Main Results:

• Metabolic inhibitors (MI) induced PLGA-NP colocalization within intracellular membranous structures, primarily endosomes and lysosomes.
• Several small molecule inhibitors significantly increased the intracellular accumulation of PLGA-NPs.
• These findings highlight specific cellular compartments involved in PLGA-NP trafficking.

Conclusions:

• This research clarifies the intracellular trafficking dynamics of PLGA-NPs.
• Clinically relevant small molecules can enhance PLGA-NP retention by prolonging their presence within intracellular vesicles.
• The findings suggest potential therapeutic benefits through improved nanoparticle residency and reduced extrusion.