Optimizing Niclosamide for Cancer Therapy: Improving Bioavailability via Structural Modification and Nanotechnology.

Area of Science:

• Pharmacology
• Drug Delivery
• Oncology

Background:

• Niclosamide is a potent inhibitor of multiple cancer-related pathways.
• Poor bioavailability limits niclosamide's clinical application in cancer therapy.

Purpose of the Study:

• To review current strategies for enhancing niclosamide bioavailability.
• To explore the role of chemical modification and nanotechnology in improving niclosamide drug delivery.

Main Methods:

• Review of literature on niclosamide derivatives and nanotechnologies.
• Analysis of in vitro and in vivo studies on niclosamide metabolism.
• Discussion of strategies to overcome first-pass metabolism.

Main Results:

• Niclosamide derivatives (e.g., o-alkylamino-tethered, ethanolamine salt, piperazine salt) show increased water solubility and maintained in vitro anticancer activity.
• Nanotechnologies like electrospraying and supercritical fluids offer potential for improved drug delivery.
• Understanding and inhibiting first-pass metabolism (cytochrome P450, UDP-glucuronosyltransferase) can enhance bioavailability.

Conclusions:

• Chemical modification and nanotechnology are crucial for improving niclosamide bioavailability and efficacy.
• Further research is needed to optimize niclosamide derivatives and nanodelivery systems.
• Enhancing drug-target accuracy and therapeutic index is key for niclosamide as an anti-neoplastic agent.