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Related Concept Videos

Targeted Cancer Therapies02:57

Targeted Cancer Therapies

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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
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Engineering Folic Acid-Modified Nanoparticles to Enhance Letrozole's Anticancer Action.

Neda Rostami1, Abuzar Nikzad2, Shervin Shaybani3

  • 1Department of Chemical Engineering, Arak University, Arak, 3848177584, Iran.

Macromolecular Bioscience
|April 18, 2025
PubMed
Summary
This summary is machine-generated.

Biodegradable nanoparticles loaded with letrozole (LTZ) and functionalized with folic acid (FA) show enhanced targeted delivery and controlled release for breast cancer therapy, promoting apoptosis and inhibiting invasion.

Keywords:
breast cancerscontrolled drug releaseletrozolepolymeric nanoparticlestargeted delivery

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cancer Therapy

Background:

  • Targeted drug delivery systems are crucial for enhancing anticancer efficacy and minimizing systemic toxicity.
  • Biodegradable nanoparticles offer a promising platform for controlled drug release in cancer treatment.
  • Folic acid functionalization can improve targeting of cancer cells overexpressing folate receptors.

Purpose of the Study:

  • To develop and characterize folic acid-functionalized, biodegradable nanoparticles (LTZ-FNPs) for targeted delivery of letrozole (LTZ) in breast cancer therapy.
  • To evaluate the pH-sensitive, controlled release of LTZ from the nanoparticles.
  • To assess the in vitro efficacy of LTZ-FNPs against hormone receptor-positive breast cancer cells.

Main Methods:

  • Synthesis of poly(ε-caprolactone)-co-poly(ethylene glycol) (PCL-co-PEG) nanoparticles loaded with letrozole (LTZ-NPs).
  • Conjugation of folic acid (FA) to LTZ-NPs to create LTZ-FNPs.
  • Characterization of nanoparticle morphology, size, drug entrapment efficiency, and in vitro release kinetics under different pH conditions.
  • Cytotoxicity assays using MCF-7 cells and analysis of apoptosis-related gene expression (Bcl2, Casp8) and cell cycle progression.

Main Results:

  • Spherical nanoparticles (60-90 nm) were successfully fabricated with enhanced drug entrapment and controlled release in LTZ-FNPs.
  • LTZ release was pH-dependent, increasing in acidic environments, consistent with the Korsmeyer-Peppas model.
  • LTZ-FNPs demonstrated higher cytotoxicity against MCF-7 cells, induced apoptosis, promoted cell cycle arrest at SubG1, increased p53 expression, and decreased MMP-9, inhibiting cell invasion.

Conclusions:

  • FA-functionalized, pH-sensitive biodegradable nanoparticles provide an effective system for targeted and controlled delivery of letrozole.
  • This nanodelivery approach enhances anti-cancer effects by promoting apoptosis and inhibiting invasion, with potential for reduced systemic toxicity in breast cancer treatment.