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Folate-conjugated micelles and their folate-receptor-mediated endocytosis

Tiancheng Lu1, Jing Sun, Xuexi Chen

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.

Macromolecular Bioscience
|August 19, 2009
PubMed

Insights

Folate-conjugated micelles show preferential uptake by cancer cells, indicating potential as targeted drug delivery systems. These micelles accumulate in tumors, suggesting improved therapeutic efficacy for FR-overexpressing cancers.

Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cancer Biology

Background:

  • Folate receptors (FR) are overexpressed on various cancer cells.
  • Targeted drug delivery systems can improve therapeutic outcomes by selectively delivering drugs to cancer cells.
  • Micelles are versatile nanocarriers for drug delivery.

Purpose of the Study:

  • To synthesize and characterize folate-conjugated micelles for targeted cancer therapy.
  • To evaluate the cellular uptake and biodistribution of folate-conjugated micelles in vitro and in vivo.
  • To assess the potential of folate-conjugated micelles as a drug delivery system for FR-overexpressing cancer cells.

Main Methods:

  • Synthesis of folate-conjugated copolymer (PEG-PLA-PLL/folate).
  • Preparation of folate-conjugated micelles encapsulating a model drug (mFITC).
  • In vitro cellular uptake studies using HeLa (FR-positive) and CHO (FR-negative) cells.
  • In vivo biodistribution studies in cancer-cell-bearing mice using frozen slicing.

Main Results:

  • Folate-conjugated micelles (folate(+)) and non-conjugated micelles (folate(-)) were successfully prepared.
  • Folate(-) micelles showed non-selective uptake by both HeLa and CHO cells due to cationic charges.
  • Folate(+) micelles exhibited preferential endocytosis by HeLa cells compared to CHO cells.
  • Both folate(-) and folate(+) micelles demonstrated retention in organs and tumors.
  • Folate(+) micelles showed accumulation in tumor beds.

Conclusions:

  • Folate-conjugated micelles are effective drug delivery vehicles for FR-overexpressing cancer cells.
  • The folate conjugation enables active targeting, leading to enhanced cellular uptake by cancer cells.
  • These targeted micelles show promise for improving cancer treatment by accumulating in tumor sites.

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