A folate receptor-targeted emulsion formulation for paclitaxel

Area of Science:

• Nanotechnology
• Drug Delivery Systems
• Oncology

Background:

• Folate receptors (FR) are overexpressed in various cancer cells, making them a target for drug delivery.
• Paclitaxel is a lipophilic chemotherapy drug with limited efficacy due to non-specific distribution.
• Developing targeted drug delivery systems can improve therapeutic outcomes and reduce side effects.

Purpose of the Study:

• To formulate and evaluate folate receptor (FR)-targeted emulsions for delivering paclitaxel.
• To assess the in vitro efficacy of these targeted emulsions in FR-overexpressing tumor cells.
• To investigate the potential of FR-targeted emulsions as a novel drug carrier system.

Main Methods:

• Paclitaxel-loaded emulsions (<100 nm) were prepared using the ethanol injection method.
• Emulsions were functionalized with folate-polyethylene glycol-cholesterol or PEG-DSPE for FR targeting.
• Stability, particle size, drug retention, and in vitro cytotoxicity (IC50) in KB cells were evaluated.

Main Results:

• Stable, targeted emulsions (<100 nm) were successfully prepared, encapsulating over 70% of paclitaxel.
• In vitro cytotoxicity assays showed a significant difference between targeted and non-targeted emulsions.
• The FR-targeted emulsions achieved an IC50 of 0.13 microM in FR+ KB cells.

Conclusions:

• FR-targeted emulsions effectively bind to FR in cultured KB cells, demonstrating potential for targeted drug delivery.
• This study reports the first FR-targeted emulsion-type drug carrier.
• A novel antiangiogenic mechanism for the in vivo antitumor activity of these nanoparticular emulsions is proposed.