Abstract
It is important to understand the molecular mechanisms of barrier disruption in the central nervous system (CNS) of patients with multiple sclerosis (MS). The purpose of the present study was to clarify whether claudin-11 is involved in the disruption of two endothelial barriers (blood-brain barrier (BBB) and blood-spinal cord barrier (BSCB)) and two epithelial barriers (blood-arachnoid barrier (BAB) and blood-CSF barrier (BCSFB)) in the CNS in MS. Immunohistochemical analysis revealed that, in both normal human and mouse, claudin-11 is co-localized with claudin-5 in the brain and spinal cord capillaries. The absolute protein expression level of claudin-11 was nearly equal to that of claudin-5 in rat brain capillaries, but was 2.81-fold greater in human brain capillaries. The protein expressions of claudin-11 were significantly downregulated in the brain and spinal cord capillaries of an MS patient and experimental autoimmune encephalomyelitis (EAE) mice. Specific downregulation of claudin-11 with siRNA significantly increased the transfer of membrane-impermeable FITC-dextran across human brain capillary endothelial cell (hCMEC/D3) monolayer. As for the epithelial barrier, claudin-11 protein expression was not decreased in choroid plexus epithelial cells forming the BCSFB in EAE mice, whereas it was decreased in brain and spinal cord meninges that form the BAB. Specific downregulation of claudin-11 with siRNA in a rat choroid plexus epithelial cell (TR-CSFB) monolayer significantly increased the permeability of FITC-dextran. In conclusion, our present findings indicate that claudin-11 expression at the BBB, BSCB, and BAB, but not the BCSFB, is downregulated in multiple sclerosis, impairing the functional integrity of these barriers.
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Abbreviations
- BAB:
-
Blood-arachnoid barrier
- BBB:
-
Blood-brain barrier
- BCSFB:
-
Blood-cerebrospinal fluid barrier
- B-cap:
-
Brain capillary
- BSCB:
-
Blood-spinal cord barrier
- DDA:
-
Data-dependent acquisition
- DHT:
-
Dihydrotestosterone
- EAE:
-
Experimental autoimmune encephalomyelitis
- ER-TR7:
-
A meningeal marker
- Glut1:
-
Glucose transporter 1
- hCMEC/D3:
-
Human cerebral microvascular endothelial cell line
- LC-MS/MS:
-
Liquid chromatography–tandem mass spectrometry
- MS:
-
Multiple sclerosis
- PRM:
-
Parallel reaction monitoring
- QTAP:
-
Quantitative targeted absolute proteomics
- SC-cap:
-
Spinal cord capillary
- SRM:
-
Selected reaction monitoring
- TM-BBB:
-
Mouse brain capillary endothelial cell line
- TR-CSFB:
-
Rat choroid plexus epithelial cell line
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Acknowledgements
We thank Prof Koji Fukunaga (Graduate School of Pharmaceutical Sciences, Tohoku University, Japan) for making available the confocal laser-scanning microscope, and A. Niitomi and N. Handa for their secretarial assistance.
Funding
This study was supported in part by three Grants-in-Aids from the Japanese Society for the Promotion of Science (JSPS) for Challenging Exploratory Research (KAKENHI 16K15475), Young Scientists (A) (KAKENHI 16H06218), and Scientific Research (B) (KAKENHI 17H04004), and was also supported in part by the Nakatomi Foundation.
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Tetsuya Terasaki and Sumio Ohtsuki are full professors at Tohoku University and Kumamoto University, and are also directors of Proteomedix Frontiers Co., Ltd. This study was not supported by Proteomedix Frontiers Co., Ltd., and their positions at Proteomedix Frontiers Co., Ltd., did not influence the design of the study, the collection of data, the analysis or interpretation of data, the decision to submit the manuscript for publication, or writing of the manuscript. There were no financial conflicts. The other authors declare no competing interests.
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Supplemental data including the experimental data and the details of the materials and methods is available at Molecular Neurobiology online.
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Uchida, Y., Sumiya, T., Tachikawa, M. et al. Involvement of Claudin-11 in Disruption of Blood-Brain, -Spinal Cord, and -Arachnoid Barriers in Multiple Sclerosis. Mol Neurobiol 56, 2039–2056 (2019). https://doi.org/10.1007/s12035-018-1207-5
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DOI: https://doi.org/10.1007/s12035-018-1207-5