A mathematical investigation into the uptake kinetics of nanoparticles <i>in vitro</i>

West, Hannah, Roberts, Fiona, Sweeney, Paul, Walker-Samuel, Simon, Leedale, Joseph ORCID: 0000-0001-9010-4126, Colley, Helen, Murdoch, Craig, Shipley, Rebecca J and Webb, Steven
(2021) A mathematical investigation into the uptake kinetics of nanoparticles <i>in vitro</i>. PLOS ONE, 16 (7). e0254208-.

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Nanoparticles have the potential to increase the efficacy of anticancer drugs whilst reducing off-target side effects. However, there remain uncertainties regarding the cellular uptake kinetics of nanoparticles which could have implications for nanoparticle design and delivery. Polymersomes are nanoparticle candidates for cancer therapy which encapsulate chemotherapy drugs. Here we develop a mathematical model to simulate the uptake of polymersomes via endocytosis, a process by which polymersomes bind to the cell surface before becoming internalised by the cell where they then break down, releasing their contents which could include chemotherapy drugs. We focus on two in vitro configurations relevant to the testing and development of cancer therapies: a well-mixed culture model and a tumour spheroid setup. Our mathematical model of the well-mixed culture model comprises a set of coupled ordinary differential equations for the unbound and bound polymersomes and associated binding dynamics. Using a singular perturbation analysis we identify an optimal number of ligands on the polymersome surface which maximises internalised polymersomes and thus intracellular chemotherapy drug concentration. In our mathematical model of the spheroid, a multiphase system of partial differential equations is developed to describe the spatial and temporal distribution of bound and unbound polymersomes via advection and diffusion, alongside oxygen, tumour growth, cell proliferation and viability. Consistent with experimental observations, the model predicts the evolution of oxygen gradients leading to a necrotic core. We investigate the impact of two different internalisation functions on spheroid growth, a constant and a bond dependent function. It was found that the constant function yields faster uptake and therefore chemotherapy delivery. We also show how various parameters, such as spheroid permeability, lead to travelling wave or steady-state solutions.

Item Type: Article
Uncontrolled Keywords: Animals, Humans, Antineoplastic Agents, Drug Carriers, Endocytosis, Biological Transport, Kinetics, Models, Biological, Nanoparticles
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 23 Jul 2021 10:08
Last Modified: 08 Oct 2023 15:18
DOI: 10.1371/journal.pone.0254208
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3131062

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