1. The present study was designed to clarify whether brain pericytes and pericyte-derived transforming growth factor-β1 (TGF-β1) participate in cyclosporin A (CsA)-induced dysfunction of the blood-brain barrier (BBB).
2. The presence of brain pericytes markedly aggravated CsA-increased permeability of MBEC4 cells to sodium fluorescein and accumulation of rhodamine 123 in MBEC4 cells.
3. Exposure to CsA significantly decreased the levels of TGF-β1 mRNA in brain pericytes in pericyte co-cultures. Treatment with TGF-β1 dose-dependently inhibited CsA-induced hyperpermeability and P-glycoprotein dysfunction of MBEC4 cells in pericyte co-cultures.
4. These findings suggest that an inhibition of brain pericyte-derived TGF-β1 contributes to the occurrence of CsA-induced dysfunction of the BBB.
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ACKNOWLEDGMENTS
This work was supported, in part, by Grants-in-Aid for Scientific Research ((B) 17390159) from JSPS, Japan and by a Grant-in-Aid for Exploratory Research (17659160) from MEXT, Japan. The authors thank Dr. Mária A. Deli (Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences) for pertinent comments on the manuscript.
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Takata, F., Dohgu, S., Yamauchi, A. et al. Inhibition of Transforming Growth Factor-β Production in Brain Pericytes Contributes to Cyclosporin A-Induced Dysfunction of the Blood-Brain Barrier. Cell Mol Neurobiol 27, 317–328 (2007). https://doi.org/10.1007/s10571-006-9125-x
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DOI: https://doi.org/10.1007/s10571-006-9125-x