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Updated: Jun 5, 2026
Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
Published on: January 20, 2018
Origin of broad polydispersion in functionalized dendrimers and its effects on cancer-cell binding affinity
Jack N Waddell1, Douglas G Mullen, Bradford G Orr
1Department of Mathematics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Abstract:
Nanoparticles with multiple ligands have been proposed for use in nanomedicine. The multiple targeting ligands on each nanoparticle can bind to several locations on a cell surface facilitating both drug targeting and uptake. Experiments show that the distribution of conjugated ligands is unexpectedly broad, and the desorption rate appears to depend exponentially upon the mean number of attached ligands. These two findings are explained with a model in which ligands conjugate to the nanoparticle with a positive cooperativity of ≈4 kT , and that nanoparticles bound to a surface by multiple bonds are permanently affixed. This drives new analysis of the data, which confirms that there is only one time constant for desorption, that of a nanoparticle bound to the surface by a single bond.
Insights
Multiligand nanoparticles offer improved drug targeting and cellular uptake. A new model explains ligand distribution and desorption, revealing that multiple bonds permanently affix nanoparticles, with single bonds determining desorption time.
Area of Science:
- Nanomedicine
- Biophysics
- Materials Science
Background:
- Multiligand nanoparticles enhance drug targeting and cellular uptake by binding to multiple cell surface locations.
- Previous observations showed broad ligand distribution and exponential desorption rates dependent on attached ligand numbers.
Purpose of the Study:
- To explain the observed ligand distribution and desorption kinetics of multiligand nanoparticles.
- To develop a model accounting for ligand conjugation and nanoparticle-surface interactions.
Main Methods:
- A theoretical model was developed to describe ligand conjugation with positive cooperativity.
- Experimental data on ligand distribution and desorption rates were re-analyzed using the model.
- The model predicts nanoparticle-surface binding stability based on the number of attached ligands.
Main Results:
- Ligand conjugation exhibits positive cooperativity (≈4 kBT).
- Nanoparticles with multiple surface bonds are permanently affixed.
- Desorption kinetics are characterized by a single time constant, corresponding to single-bond detachment.
Conclusions:
- Positive cooperativity in ligand conjugation explains nanoparticle behavior.
- The findings clarify the mechanism of multiligand nanoparticle binding and stability.
- This work provides a framework for designing more effective targeted nanomedicines.
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