Surface-engineered dendrimers for dual drug delivery: a receptor up-regulation and enhanced cancer targeting strategy

J Drug Target. 2008 Dec;16(10):758-72. doi: 10.1080/10611860802473154.

Abstract

The present study is aimed at developing and evaluating a combined strategy of dual drug delivery, receptor up-regulation, and drug targeting. The dendritic architectures were synthesized and characterized by IR, (1)H-NMR, and (13)C-NMR spectroscopy. The pH-responsive simultaneous release behavior of the loaded bioactive from the carrier was also explored. The cell line studies for MTT cytotoxicity, receptor blockade, and receptor up-regulation assays were performed on HeLa cells. Treatment of cells with low concentration of all-trans retinoic acid (ATRA, approximately 1 microM) caused a selective up-regulation of folate receptors by 2.21-folds when compared with that of untreated control, after 48 h. ATRA showed a lag phase of 12 h in up-regulating the folate receptors. After 48 h, the IC(50) value of naked methotrexate (MTX)-ATRA combination and dendrimer-loaded MTX-ATRA combination were found to be approximately 0.1 and 10 microM, respectively, while folate-anchored dendrimer loaded with MTX-ATRA showed a selectively lowered IC(50) value of 0.04 microM. It was concluded that in allied ailments like cancer, the proposed dual-drug delivery modality bearing anti-cancer bioactive in conjunction with folate receptor up-regulating cargo may prove to be a promising approach toward the development of a flourishing cancer therapy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / administration & dosage
  • Antineoplastic Agents / therapeutic use
  • Carrier Proteins / antagonists & inhibitors
  • Carrier Proteins / genetics
  • Carrier Proteins / metabolism*
  • Dendrimers / chemistry*
  • Dose-Response Relationship, Drug
  • Drug Delivery Systems*
  • Folate Receptors, GPI-Anchored
  • HeLa Cells
  • Humans
  • Methotrexate / administration & dosage*
  • Methotrexate / therapeutic use
  • Molecular Structure
  • Neoplasms / drug therapy
  • Receptors, Cell Surface / antagonists & inhibitors
  • Receptors, Cell Surface / genetics
  • Receptors, Cell Surface / metabolism*
  • Tretinoin / administration & dosage*
  • Tretinoin / therapeutic use
  • Up-Regulation / drug effects*

Substances

  • Antineoplastic Agents
  • Carrier Proteins
  • Dendrimers
  • Folate Receptors, GPI-Anchored
  • Receptors, Cell Surface
  • Tretinoin
  • Methotrexate