Auto-fluorescent PAMAM-based dendritic molecules and their potential application in pharmaceutical sciences.

Area of Science:

• Nanotechnology
• Biomaterials Science
• Cell Biology

Background:

• Poly(amidoamine) (PAMAM) dendrons are versatile nanomaterials with tunable properties.
• Fluorescent dendrons are valuable tools for biological imaging and drug delivery.
• Understanding dendron transport across epithelial barriers is crucial for biomedical applications.

Purpose of the Study:

• To quantify the epithelial permeation of novel fluorescent PAMAM dendrons.
• To investigate the relationship between dendron size, cell barrier properties, and transport mechanisms.
• To assess the biocompatibility of these dendrons with epithelial cell models.

Main Methods:

• Synthesis of water-soluble fluorescent PAMAM dendrons with a 7H-benz[de]benzimidazo[2,1-a]isoquinoline-7-one core.
• Quantification of hydrodynamic radii using pulsed-gradient spin-echo Nuclear Magnetic Resonance (PGSE-NMR).
• Epithelial permeation studies using Madin-Darby canine kidney (MDCK) I and II cell monolayers.

Main Results:

• Dendritic molecules were found to be molecularly disperse and non-aggregating.
• Hydrodynamic radii indicated minimal size increase compared to parent structures.
• PAMAM dendrons demonstrated biocompatibility and permeated MDCK cell monolayers.
• Permeability correlated with dendron size and cell barrier restrictiveness.

Conclusions:

• The studied fluorescent PAMAM dendrons are suitable for in-vitro epithelial transport studies.
• Paracellular mechanisms are the predominant route for dendron transport across epithelial barriers.
• Dendron size and epithelial barrier properties are key determinants of molecular permeation.