Blood-brain barrier model
A method of creating a multicellular blood-brain barrier model is disclosed. In one embodiment, the method comprises culturing primary brain microvascular endothelial cells or embryonic stem cell-derived endothelial cells upon a permeable support in the presence of neural progenitor cells.
1. A method of analyzing the blood-brain barrier permeability characteristics of a model compound comprising the steps of:
a) creating a multicellular blood-brain barrier model by culturing brain microvascular endothelial cells upon a permeable support in the presence of pre-differentiated multipotent neural progenitor cells wherein the endothelial cells form a monolayer wherein the cells are confluent and express and initial transendothelial electrical resistance (TEER) of 20-50 Ohm×cm 2 before exposure to the neural cells, and wherein the pre-differentiated multipotent neural progenitor cells further differentiate into mixtures of astrocytes, neurons and oligodendrocytes, wherein the TEER is greater than 100 Ohm×cm 2 after exposure to the differentiated neural cells and wherein the model is then capable of a TEER of greater than 100 Ohm×cm 2 for a period of at least 72 hours;
b) exposing a model compound to the blood-brain barrier model resulting from step (a), and
c) measuring the permeability of the barrier model to the compound.
2. The method of claim 1 wherein the measurement is by determination of compound concentration in on each side of the brain microvascular endothelial cell monolayer.
3. The method of claim 1 wherein the endothelial cells are isolated from mammalian brain capillaries in step (a).
4. The method of claim 1 wherein the endothelial cells are derived from isolated embryonic stem cells in step (a).
5. The method of claim 1 wherein the TEER is greater than 200 Ohm×cm 2 after exposure to the neural cells in step (a).
6. The method of claim 1 wherein the neural progenitor cells are isolated from mammalian cortices in step (a).
7. The method of claim 6 wherein the neural cells are digested with at least one enzyme to dissociate the cells.
8. The method of claim 1 wherein the neural progenitor cells are grown as free-floating neurospheres before differentiation in step (a).
9. The method of claim 1 wherein the neural cells are removed after the endothelial cells are confluent and wherein the endothelial cells express a TEER of at least 100 Ohm×cm 2 .