Abstract
Cell culture-based blood–brain barrier (BBB) models are useful experimental tools for developing central nervous system drugs. Several endothelial cell sources exist for BBB models, including primary cultured brain endothelial cells and immortalized cell lines. Among them, primary cell-based models are considered suitable for the functional analysis of the BBB; however, little is known about the utility of low-passage brain endothelial cells for this purpose. In this study, we investigated the effect of passage on brain endothelial cells from human, mouse and rat brain tissue as BBB models. We established in vitro BBB models using primary brain endothelial cells (Passage 1–Passage 4) from humans, mice, and rats. To analyze the effect of cell type on BBB function, we evaluated transendothelial electrical resistance (TEER) and performed immunofluorescence staining of tight junction proteins. Among the brain endothelial cell models, TEER was highest in the Passage 1 (P1) cell-based BBB model. There was no adequate increase in TEER in other low-passage cultures (P2–P4). A confluent, non-overlapping, uniform monolayer of cells in all P1 cell-based models was visible on immunostaining of tight junction proteins, whereas it was weak or undetectable in more passaged cultures. Increasing passages cultured of brain endothelial cells did not exhibit restrictive BBB function regardless of the cell source and despite culturing with pericytes and astrocytes. Among the tested culture models, only the lowest cultured cell-based models are suitable for functional analysis of the BBB.
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This study was partially funded by JSPS and HAS under the Japan-Hungary Research Cooperative Program (to Y.M.), Grants-in-Aid for Scientific Research (Fostering Joint International Research) 15KK0349 (to Y.M.), Grants-in-Aid for Scientific Research (C) 17K10840 (to Y.M.), (C) 17K10838 (to S.N.), (C) 18K08973 to (T.I. and Y.M.).
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TF and YM designed the study and wrote the initial draft of the manuscript. SN and AK contributed to data analysis and interpretation. MN and WB were involved in planning and supervision of the work. All other authors contributed to data collection and interpretation, and they critically reviewed the manuscript. All authors have approved the final version of the manuscript and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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Fujimoto, T., Morofuji, Y., Nakagawa, S. et al. Comparison of the rate of dedifferentiation with increasing passages among cell sources for an in vitro model of the blood–brain barrier . J Neural Transm 127, 1117–1124 (2020). https://doi.org/10.1007/s00702-020-02202-1
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DOI: https://doi.org/10.1007/s00702-020-02202-1