Nanoparticle-Membrane Interactions in Biomedical Applications

Interactions between engineered nanoparticles and biological membranes underlie many emerging diagnostic and therapeutic strategies. Nanoparticles can be designed with tailored size, shape, surface chemistry and mechanical properties to modulate their adhesion, penetration and fusion with lipid bilayers. Such interactions govern cellular uptake pathways—ranging from endocytosis to direct translocation—and determine biodistribution, intracellular trafficking and ultimate biological response. Coating inorganic cores with lipid bilayers or polymeric shells can enhance colloidal stability in physiological media, reduce nonspecific protein adsorption and promote targeted delivery. Thermodynamic parameters, including entropic and enthalpic contributions, dictate nanoparticle partitioning and membrane remodelling, while cooperative effects among multiple particles can facilitate membrane permeation. These fundamental principles are being harnessed worldwide to improve the safety and efficacy of drug carriers, imaging probes and biosensors, with particular emphasis on cancer therapy, gene delivery and immunomodulation.

Research from Nature Portfolio

Recent studies have delineated how nanoparticle size thresholds control membrane binding and disruption. One report quantified the enthalpy changes associated with gold nanoparticles of varying diameters interacting with model lipid vesicles, revealing two critical size regimes that dictate adsorption versus insertion. Computational investigations have explored a three-dimensional design space of nanoparticle size, surface charge and ligand chemistry, identifying four distinct translocation modes—outer wrapping, free translocation, inner attachment and embedment—each mediated by local membrane curvature. Foundational simulations of multiple particles have further shown that cooperative clustering, dispersion and re-aggregation pathways modulate penetration efficiency, highlighting how surface hydrophobicity and particle number jointly shape transmembrane delivery.

Nanoparticle-Membrane Interactions in Biomedical Applications publication trend

The graph below shows the total number of articles in nanoparticle-membrane interactions in biomedical applications across all publications each year (not limited to Nature Index journals).

Technical terms

Lipid bilayer: A double layer of amphiphilic lipids forming the basic structural framework of cell membranes.

Unilamellar vesicle: A spherical lipid assembly with a single bilayer, used as a simplified model of a cell membrane.

Translocation: The process by which a nanoparticle crosses or embeds within a lipid membrane.

Plasmonic resonance: Collective oscillation of conduction electrons in metal nanoparticles, sensitive to changes in the local environment and used for sensing bilayer integrity.

Entropic force: A driving force arising from changes in system entropy, significant in nanoparticle-membrane association and uptake.

References

1. Probing the coverage of nanoparticles by biomimetic membranes through nanoplasmonics. Journal of Colloid and Interface Science (2023).
2. Entropy‐Mediated Nanoparticle Cellular Uptake. Small Science (2023).
3. Cellular uptake and retention of nanoparticles: Insights on particle properties and interaction with cellular components. Materials Today Communications (2020).
4. Understanding the Nano-bio Interfaces: Lipid-Coatings for Inorganic Nanoparticles as Promising Strategy for Biomedical Applications. Frontiers in Chemistry (2019).
5. Nanoparticles for Imaging, Sensing, and Therapeutic Intervention. ACS Nano (2014).
6. Size dependency of gold nanoparticles interacting with model membranes. Communications Chemistry (2020).
7. Cooperative Transmembrane Penetration of Nanoparticles. Scientific Reports (2015).
8. Understanding the synergistic effect of physicochemical properties of nanoparticles and their cellular entry pathways. Communications Biology (2020).