Modelling of mass transport and distribution of aptamer in blood-brain barrier for tumour therapy and cancer treatment.

Autor: Sarafraz M; School of Engineering, Deakin University, Waurn Ponds, Geelong, VIC 3216, Australia., Nakhjavani M; School of Medicine, Deakin University, Geelong, VIC 3220, Australia; Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Deakin University, Geelong, VIC 3220, Australia. Electronic address: maryam.nakhjavani@deakin.edu.au., Shigdar S; School of Medicine, Deakin University, Geelong, VIC 3220, Australia; Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Deakin University, Geelong, VIC 3220, Australia., Christo FC; School of Engineering, Aerospace Engineering & Aviation, RMIT University, VIC 3082, Australia., Rolfe B; School of Engineering, Deakin University, Waurn Ponds, Geelong, VIC 3216, Australia.
Jazyk: angličtina
Zdroj: European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V [Eur J Pharm Biopharm] 2022 Apr; Vol. 173, pp. 121-131. Date of Electronic Publication: 2022 Mar 10.
DOI: 10.1016/j.ejpb.2022.03.004
Abstrakt: The blood-brain barrier (BBB) is a strong barrier against the entrance of drugs, which has made brain cancer treatment a major challenge. We have previously shown that targeting transferrin receptors using aptamers increased brain drug delivery. To get a better understanding of this phenomenon, in the present article, a mathematical model based on the finite element method was developed accounting for the fluid flow and mass transport of the aptamer molecule inside an 8 µm capillary vessel across a 14 µm blood-brain barrier domain. The fluid flow and mass transport equations were coupled to calculate the blood velocity and aptamer concentration profiles across the BBB. It was identified that the thickness of the astrocyte and endothelial cell layers are key parameters affecting the concentration of the aptamer delivered to the last neuron dendrites in the BBB. The predicted efficacy of the drug delivery (C apt /C in ) of 10.9% to 13.8% was calculated at a porosity of 0.5 to 0.9, respectively, at a blood velocity of 0.38 mm/s, which was independent of the inlet concentration of the aptamer. This low efficacy was attributed to the mass transfer resistance across endothelial cells, astrocyte and pericyte layers, which decreased the concentration by 6.7%. It was also identified that the main mechanism of drug delivery is switched from convective mass transport in the capillary layer (with Peclet number > 50) to mixed convection mass transport (1 < Peclet number < 5) in the porous layers and to diffusion only once aptamer reached the brain parenchyma (Peclet number < 1).
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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