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Active enzymes outside a cell may help nearby molecules move faster and enter cells more readily. In a controlled study of cultured retinal pigment epithelial (RPE) cells, enzyme catalysis increased the measured movement of transferrin and coincided with greater uptake through clathrin-mediated endocytosis. The result is specific to that experimental system; it does not show that enzymes speed every molecule inside the body or enable drug delivery in people.
How can enzyme activity make molecules move faster?
Enzymes catalyze chemical reactions, and the study suggests that active catalysis can also create mechanical fluctuations in the surrounding fluid. These are described as nonthermal fluctuations: physical disturbances associated with the enzymes’ ongoing reactions, rather than ordinary Brownian motion caused by thermal energy. The proposed effect is a kind of microscopic stirring that helps nearby ligand molecules travel through extracellular fluid and encounter receptors on a cell surface.
The study examined fluorescent transferrin near cultured RPE cells while reactions occurred outside the cells. Urease and alkaline phosphatase were among the enzyme systems tested. The enzymes were not described as entering the cells or chemically modifying the transferrin; the researchers’ interpretation is that catalysis changed the cargo’s movement through the surrounding fluid. That interpretation should not be taken as ruling out every possible alternative mechanism.
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What changed in the experiments?
The reported figures describe different measurements, so they should not be treated as interchangeable estimates of a single effect. The percentages below come from the Indian Institute of Technology Gandhinagar’s account published October 7, 2026. The primary paper’s abstract supports the general finding of increased transferrin diffusion near cells, while the specific figures are attributed to the institutional account.
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| Readout | Reported result | What it measures |
|---|---|---|
| Transferrin movement by total internal reflection fluorescence microscopy (TIRF) | Roughly 50% faster movement, as reported by the IIT Gandhinagar account | Movement observed near the cell surface |
| Transferrin diffusivity by fluorescence correlation spectroscopy (FCS) | Approximately 40% higher with urease and 44% higher with alkaline phosphatase, as reported by the IIT Gandhinagar account | Diffusivity, a measure of how molecules spread through their environment |
| Cellular transferrin uptake | Approximately 17% greater uptake, as reported by the IIT Gandhinagar account | How much fluorescent transferrin the cells took up |
| Forces during active catalysis | Piconewton-range forces detected, as reported by the IIT Gandhinagar account | Mechanical forces measured with optical tweezers |
The movement and diffusivity results concern how transferrin travels; uptake concerns how much enters cells. A larger change in motion than in uptake is therefore not contradictory. The IIT Gandhinagar account explains the difference with a receptor-availability model: faster arrivals can fill available receptors sooner, but uptake gains level off as receptors become occupied. This is the account’s explanation for the observed difference, not a universal quantitative rule.
Did the effect require active enzymes and a particular uptake route?
According to the IIT Gandhinagar account, the enhancement depended on active catalysis, not simply on adding enzyme, substrate, or reaction products. The account also reports that inhibiting dynamin eliminated the enzyme-driven uptake boost. The researchers interpret this as evidence that the effect depended on clathrin-mediated endocytosis in this experiment—the route by which the cells take up transferrin.
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This pathway result narrows what the experiment supports: it links extracellular enzyme activity to transferrin uptake through a particular cellular route in the tested system. It does not establish that the same effect would occur for other cargoes or uptake pathways.
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The finding adds a possible physical contribution to molecular transport near cells: chemical activity outside a cell may influence how readily a ligand reaches its surface. It is related in broad terms to earlier work on energy-dependent active motion, but the systems are distinct. A 2012 study reported ATP-dependent fluctuations contributing to the movement of chromosomal loci in E. coli and yeast; that work is background on active motion, not evidence that the newer extracellular-enzyme effect applies throughout cells.
The current result concerns fluorescent transferrin and cultured RPE cells under controlled conditions. It does not establish an effect for all molecules, tissues, or organisms, nor does it show that enzymes accelerate molecules already inside cells. The measurements also do not demonstrate therapeutic delivery. Corresponding author Krishna Kanti Dey said such applications, including transport of therapeutic cargoes across biological barriers, remain to be tested.
For the general idea that molecules move by diffusion, see the Molecular Biology of the Cell chapter on molecular movement and diffusion. It provides conceptual background rather than evidence about this enzyme experiment.
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