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Guanidinium-rich materials help deliver cargo into cells, but how they work is unclear. Further research is needed to understand the role of guanidinium group placement in cellular uptake and targeting.

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Area of Science:

  • Biomaterials Science
  • Cellular Biology
  • Drug Delivery

Background:

  • Guanidinium-rich scaffolds enhance cellular translocation and cargo delivery across biological barriers.
  • Existing studies show significant uptake of nonpeptidic guanidinylated scaffolds in vitro and in vivo.
  • Fundamental mechanisms governing these processes remain poorly understood.

Purpose of the Study:

  • To investigate the fundamental mechanisms of cellular translocation mediated by guanidinium-rich scaffolds.
  • To explore the influence of guanidinium group characteristics on cargo delivery efficiency and biodistribution.
  • To elucidate the role of charge pairing and hydrogen bonding in cellular uptake.

Main Methods:

  • Utilized guanidinium-rich scaffolds with varying numbers and spatial arrangements of guanidinium groups.
  • Investigated cellular uptake mechanisms using cell culture models.
  • Assessed cargo delivery efficiency and organelle/organ localization in relevant models.

Main Results:

  • Demonstrated significant cellular uptake and cargo delivery mediated by guanidinium-rich scaffolds.
  • Identified putative roles for charge pairing and hydrogen bonding in cellular interactions.
  • Observed that scaffold properties influence delivery efficiency and localization.

Conclusions:

  • Guanidinium-rich scaffolds are effective tools for cellular delivery, but their mechanisms require further elucidation.
  • Understanding the impact of guanidinium group presentation is crucial for optimizing scaffold design.
  • Further studies are warranted to fully establish the structure-activity relationships for targeted delivery.