Research Uncovers Key Role of Protein Corona in Nanoparticle Exocytosis

Strategic Insights -

Scientists have made a significant discovery in the field of nanotechnology, revealing that the protein corona plays a crucial role in the exocytosis of nanoparticles. The study, conducted by researchers at the Max Planck Graduate Center, demonstrates that the pre-adsorption of a human plasma protein corona enhances the exocytosis of silica nanoparticles from HCT 116 cells. This breakthrough has implications for the development of nanocarriers for drug delivery, highlighting the need to engineer nanocarriers that are not exocytosed rapidly to enhance therapeutic efficacy.

Key Takeaways:

  • The protein corona significantly influences the exocytosis of nanoparticles, with larger nanoparticles (100 nm) being more readily exocytosed than smaller ones (10 nm).
  • The composition of the protein corona varies depending on the size of the nanoparticles, with apolipoproteins and coagulation proteins being enriched in a size-dependent manner.
  • A proteomic analysis revealed that small silica nanoparticles (10 nm) adsorb high amounts of apolipoproteins, while larger nanoparticles (100 nm) adsorb a mixture of apolipoproteins and coagulation proteins.
  • The pre-adsorption of a human plasma protein corona enhances the exocytosis of silica nanoparticles, with the effect being more pronounced for larger nanoparticles.
  • The findings of this study have significant implications for the development of nanocarriers for drug delivery, highlighting the need to engineer nanocarriers that are not exocytosed rapidly to enhance therapeutic efficacy.
  • The study demonstrates the importance of considering the protein corona in the design and development of nanocarriers for therapeutic applications.

Statistics:

  • 100 nm nanoparticles showed a significant increase in exocytosis in the presence of a protein corona (25.6fold increase).
  • 10 nm nanoparticles showed a decrease in exocytosis in the presence of a protein corona (-21.1%).
  • The protein corona composition varied depending on the size of the nanoparticles, with apolipoproteins being enriched on small silica nanoparticles (10 nm) and a mixture of apolipoproteins and coagulation proteins on larger nanoparticles (100 nm).
  • The study involved a proteomic analysis of the plasma protein corona of different-sized silica nanoparticles (10 nm, 30 nm, 50 nm, and 100 nm).

Sources:

  • NewsRx. Max-Planck-Institute for Polymer Research Reports Findings in Exocytosis (Plasma protein corona on silica nanoparticles enhances exocytosis). Nanotechnology Weekly. June 9, 2025; p 712.
  • Royal Society of Chemistry. Biomaterials Science. pubs.rsc.org/en/journals/journalissues/bm
  • Max-Planck-Institute for Polymer Research. Ackermannweg 10, 55128 Mainz, Germany. Contact: Laura Dietz.
  • Julia Simon, Kai R. Speth, Katharina Landfester, and Volker Mailander. "Plasma protein corona on silica nanoparticles enhances exocytosis." Biomaterials Science, 2025.