In a 2016 laboratory study, researchers used nanoparticles to assemble dispersed, weakly adhesive mouse cells into cohesive aggregates. The finding offers a model for how particles can influence cell adhesion; it does not show that nanoparticles heal wounds or treat cancer.
How can nanoparticles make cells stick together?
The study focused on S180 murine cells depleted of cadherins, proteins that normally help cells adhere to one another. These cells had very low natural cell-to-cell adhesion. In suspension experiments, adding nanoparticles helped the dispersed cells form larger, cohesive aggregates.
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The work, by B. Brunel and colleagues, was published as “Nanostickers for cells: A model study using cell-nanoparticle hybrid aggregates” in Soft Matter 12(38), pages 7902–7907, in 2016. Its abstract describes nanoparticle-induced assembly and a model in which aggregation depends on particle size, concentration and surface chemistry. Read the paper’s bibliographic record and abstract.
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The researchers monitored aggregation over time and compared polystyrene and silica nanoparticles. The reported process involved cells and particles diffusing through the suspension and colliding. The authors described it with second-order kinetics, a model of how aggregation changes as interacting components encounter one another.
The model accounted for nanoparticles in three states: free in the suspension, attached to cell membranes, or internalized by cells. It treated particle size, concentration and surface chemistry as relevant variables, rather than assuming that every nanoparticle would behave alike.
What the particle comparisons showed
In the tests summarized by Chemistry World’s 16 September 2016 account, smaller polystyrene particles promoted stronger adhesion than larger ones. The report also said particle charge did not affect binding in that system. These observations apply to the tested particles and cadherin-depleted S180 cell model; they are not universal rules for nanoparticle behavior.
Why the mechanism remains uncertain
The experiments showed an adhesive effect, but they did not settle how nanoparticles produced it. Josep Samitier Martí, a nanobioengineer at the Institute for Bioengineering of Catalonia, identified several possibilities: electrostatic forces, proteins adsorbing onto particle surfaces, or interactions with cell receptors. The available account presents these as open questions, not established explanations.
That uncertainty matters because “nanoparticles” are not a single material or surface. Different sizes, compositions and surface chemistries may interact differently with cells and with the molecules surrounding them. Françoise Winnik of the University of Montreal described the model as a way to study nanoparticles at cell surfaces, while also noting its potential relevance to particles that act inside cells.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the result could—and could not—mean for medicine
Wound healing, tissue engineering, bioprinting and cancer-related research were discussed as possible directions. They were prospective applications, not outcomes demonstrated by the cell-suspension experiments. The study does not establish that nanoparticles heal wounds, build functional tissue, or prevent cancer metastasis in people.
In particular, simply making tumour cells adhere to one another would not by itself resolve the complex processes involved in metastasis. Samitier Martí cautioned that this idea could be overly simplistic. Before any clinical application could be considered, researchers would need to understand the adhesion mechanism and study how nanoparticles behave in complex physiological environments.
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