Time-Resolved Proteomic Visualization of Dendrimer Cellular Entry and Trafficking

Area of Science:

• Cell biology
• Proteomics
• Nanomaterials science

Background:

• Understanding cellular entry mechanisms is crucial for biological research.
• Dendrimers are nanoparticles with diverse applications, but their cellular interactions require further elucidation.

Purpose of the Study:

• To develop a novel proteomic strategy for real-time analysis of protein-dendrimer interactions during cellular internalization.
• To identify key proteins involved in dendrimer cell entry pathways.

Main Methods:

• Development of TITAN (Tracing Internalization and TrAfficking of Nanomaterials) proteomic strategy.
• Utilizing photoreactive cross-linker-functionalized dendrimers and HeLa cells.
• Quantitative proteomics analysis of cross-linked proteins at various time points post-internalization.

Main Results:

• Identification of 809 proteins interacting with dendrimers in a temporal manner.
• Traceable interactions linked to clathrin-mediated and caveolar/raft-mediated endocytosis.
• Dynasore inhibition confirmed the involvement of these two endocytic pathways.

Conclusions:

• TITAN is an effective systems biology approach for real-time characterization of protein-nanomaterial interactions.
• Dendrimer internalization involves both clathrin-mediated and caveolar/raft-mediated endocytic pathways.
• The study provides a temporal map of protein engagement during nanoparticle uptake.