Nanoparticle Interaction Dynamics in Cellular Systems

Nanoparticles engage living cells through a multifaceted sequence of events that begins with adsorption at the cell membrane and proceeds through internalisation, intracellular trafficking and eventual release or degradation. Key determinants of these processes include particle size, shape, surface charge and coating, which govern the route of endocytosis, the formation of a dynamic protein corona and interactions with organelles such as endosomes and lysosomes. Once internalised, nanoparticles may escape endosomal entrapment or be rerouted to degradative compartments, influencing both their therapeutic efficacy and cytotoxic risk. Equally important is the exocytosis of nanoparticles, a regulated process by which cells expel foreign material, thereby modulating intracellular load and mitigating adverse effects. Understanding these interaction dynamics is crucial for the safe design of nanomedicines, targeted drug-delivery systems and diagnostic agents, and informs regulatory assessments across biomedical and environmental contexts.

Research from Nature Portfolio

Advances in multifunctional nanoparticle engineering have demonstrated the power of polymeric surface design to combine targeting and endosomal escape in a single platform. A seminal study developed mesoporous silica nanoparticles loaded with anticancer agents and dual-coated with a cationic polymer to promote endosomal rupture, and a ligand recognising overexpressed receptors on tumour cells. This dual functionalisation not only enhanced selective uptake by malignant cells but also substantially improved cytosolic delivery of the payload at low dosage. The work underlines how precise polymer chemistry can overcome intracellular barriers, maximise therapeutic index and pioneer next-generation drug-delivery systems.

Nanoparticle Interaction Dynamics in Cellular Systems publication trend

The graph below shows the total number of articles in nanoparticle interaction dynamics in cellular systems across all publications each year (not limited to Nature Index journals).

Technical terms

Endocytosis: Active cellular process by which particles are internalised via membrane invagination and vesicle formation.

Exocytosis: Mechanism by which cells expel internalised material through vesicle fusion with the plasma membrane.

Protein corona: Layer of adsorbed biomolecules on a nanoparticle surface that alters its biological identity.

Zeta potential: Electric potential at the slipping plane of a particle in suspension, indicative of surface charge and colloidal stability.

Endosomal escape: Process enabling internalised nanoparticles to rupture or traverse endosomal membranes to reach the cytosol.

References

1. In vitro interaction of colloidal nanoparticles with mammalian cells: What have we learned thus far?. Beilstein Journal of Nanotechnology (2014).
2. Polymeric Engineering of Nanoparticles for Highly Efficient Multifunctional Drug Delivery Systems. Scientific Reports (2019).
3. Porous Maltodextrin‐Based Nanoparticles: A Safe Delivery System for Nasal Vaccines. Journal of Nanomaterials (2018).
4. Exocytosis of Nanoparticles: A Comprehensive Review. Nanomaterials (2023).
5. Quantitative considerations about the size dependence of cellular entry and excretion of colloidal nanoparticles for different cell types. ChemTexts (2022).