Cellular uptake of modified aminoglycosides

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Mammalian cell internalization of drug carriers is crucial for targeted delivery.
• Heparan sulfate proteoglycans (HSPGs) on cell surfaces are key interaction sites.
• Aminoglycoside derivatives offer potential as cell-penetrating carriers.

Purpose of the Study:

• To investigate the cellular uptake of modified amino- and guanidino-glycosides.
• To determine the role of multivalency in the internalization process.
• To explore the interaction with cell surface HSPGs.

Main Methods:

• Confocal microscopy was used to visualize cellular uptake.
• Flow cytometry quantified the internalization of glycosides.
• Studies were conducted in native and mutant Chinese Hamster Ovary (CHO) cells.

Main Results:

• Modified glycosides, particularly multivalent forms, demonstrated significant uptake in CHO cells.
• Cellular internalization was dependent on the multivalency of the glycoside structures.
• Evidence suggests interaction with cell surface heparan sulfate proteoglycans mediates uptake.

Conclusions:

• Multivalency is a critical factor for efficient mammalian cell internalization of these glycoside carriers.
• The findings support the potential of these modified aminoglycosides for targeted cellular delivery.
• Specific interaction with cell surface HSPGs is a key mechanism for uptake.