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Vascularized neural constructs for ex-vivo reconstitution of blood-brain barrier function
سازه های عصبی عروقی برای بازسازی قبلی در داخل بدن و عملکرد سد خونی مغز-2020 Ex-vivo blood-brain barrier (BBB) model is of great value for studying brain function and drug development, but
it is still challenging to engineer macroscale three-dimensional (3D) tissue constructs to recapitulate physiological
and functional aspects of BBB. Here, we describe a delicate 3D vascularized neural constructs for ex-vivo
reconstitution of BBB function. The tissue-engineered tissue construct is based on a multicomponent 3D coculture
of four types of cells, which typically exist in the BBB and were spatially defined and organized to mimic
the in vivo BBB structure and function. A porous polycaprolactone/poly (D,L-lactide-co-glycolide) (PCL/PLGA)
microfluidic perfusion system works as the vasculature network, which was made by freeze-coating a 3D-printed
sacrificial template. Endothelial cells were seeded inside the channels of the network to form 3D interconnected
blood vessels; while other types of cells, including pericytes, astrocytes, and neurons, were co-cultured in a
collagen matrix wrapping the vasculature network to derive a vascularized neural construct that recapitulates in
vivo BBB function with great complexity and delicacy. Using this model, we successfully reconstituted BBB
function with parameters that are similar to the in vivo condition, and demonstrated the identification of BBBpenetrating
therapeutics by examining the molecular delivery to neuronal cells when relevant biologic molecules
were applied to the vasculature circulation system of the neural construct. Keywords: Tissue engineering | 3D printing | Organ on a chip | Blood-brain barrier | Vasculature network | Neuro-engineering | Drug screening |
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