Abstract
The blood–brain barrier (BBB) normally bars peripheral T lymphocytes from entering the cerebrum. Interestingly, activated T cells exist as infiltrates in the brains of Alzheimer’s disease (AD) patients, but little is known about the mechanisms involved. In this study, we observed significantly higher MHC class I expression in rat brain endothelial cells compared with controls following the induction of experimental AD models. An in vitro BBB model, which was constructed with human brain microvascular endothelial cells, was established to study the mechanisms underlying the transendothelial migration of T cells. Using in vitro studies, we demonstrated that secretion of TNF-α from Aβ1–42-treated BV2 microglia contributes to the elevated expression of MHC class I on the brain microvessel endothelium. Transmigration assays and adhesion assays confirmed that the upregulation of MHC class I molecules was associated with T cell transendothelial migration. MHC class I knock-down in HBMECs significantly attenuated the migratory and adhesive capability of the T cells. Interestingly, a TNF-α neutralizing antibody effectively blocked the transendothelial migration of T cells triggered by treatment with the supernatant from Aβ1–42-treated BV2 microglia. We propose that microglia-derived TNF-α upregulates MHC class I molecule expression on brain endothelial cells, which represents a mechanism of T cell migration into the brain. This study may provide a new insight into the potential pathomechanism of Alzheimer’s disease.
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Acknowledgments
We are grateful to Drs. Monique Stins and Kwang Sik Kim (Department of Pediatrics, Johns Hopkins University School of Medicine) for providing the HBMECs. The authors would like to thank Dong-Xin Liu for technical assistance in image processing. The authors have no financial conflict of interest.
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Yi-Ming Yang and De-Shu Shang contributed equally to this work.
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Yang, YM., Shang, DS., Zhao, WD. et al. Microglial TNF-α-Dependent Elevation of MHC Class I Expression on Brain Endothelium Induced by Amyloid-Beta Promotes T Cell Transendothelial Migration. Neurochem Res 38, 2295–2304 (2013). https://doi.org/10.1007/s11064-013-1138-5
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DOI: https://doi.org/10.1007/s11064-013-1138-5