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Qu C, Song H, Shen J, Xu L, Li Y, Qu C, Li T, Zhang J. Mfsd2a Reverses Spatial Learning and Memory Impairment Caused by Chronic Cerebral Hypoperfusion via Protection of the Blood-Brain Barrier. Front Neurosci 2020; 14:461. [PMID: 32612494 PMCID: PMC7308492 DOI: 10.3389/fnins.2020.00461] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 04/15/2020] [Indexed: 12/12/2022] Open
Abstract
Disruption of the blood–brain barrier (BBB) can lead to cognitive impairment. Major facilitator superfamily domain-containing protein 2a (Mfsd2a) is a newly discovered protein that is essential for maintaining BBB integrity. However, the role of Mfsd2a in vascular cognitive impairment has not been explored yet. In this study, a rat model of chronic cerebral hypoperfusion (CCH) was established by producing permanent bilateral common carotid artery occlusion (2VO) in rats. We found that after the 2VO procedure, the rats exhibited cognitive impairment, showed increased BBB leakage within the hippocampus, and had reduced expression of the Mfsd2a protein. The overexpression of Mfsd2a in the rat hippocampus reversed these changes. Further investigations using transmission electron microscopy revealed a significantly increased rate of vesicular transcytosis in the BBB of the hippocampus of the CCH rats; the rate reduced after overexpression of Mfsd2a. Moreover, Mfsd2a overexpression did not cause changes in the expression of tight junction-associated proteins and in the ultrastructures of the tight junctions. In conclusion, Mfsd2a attenuated BBB damage and ameliorated cognitive impairment in CCH rats, and its protective effect on the BBB was achieved via inhibition of vesicular transcytosis.
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Affiliation(s)
- Changhua Qu
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Hao Song
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Jun Shen
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Linling Xu
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Yaqing Li
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Chujie Qu
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Tian Li
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Junjian Zhang
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, China
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Yang YR, Xiong XY, Liu J, Wu LR, Zhong Q, Zhou K, Meng ZY, Liu L, Wang FX, Gong QW, Liao MF, Duan CM, Li J, Yang MH, Zhang Q, Gong CX, Yang QW. Mfsd2a (Major Facilitator Superfamily Domain Containing 2a) Attenuates Intracerebral Hemorrhage-Induced Blood-Brain Barrier Disruption by Inhibiting Vesicular Transcytosis. J Am Heart Assoc 2017; 6:JAHA.117.005811. [PMID: 28724654 PMCID: PMC5586300 DOI: 10.1161/jaha.117.005811] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Blood-brain barrier (BBB) disruption aggravates brain injury induced by intracerebral hemorrhage (ICH); however, the mechanisms of BBB damage caused by ICH remain elusive. Mfsd2a (major facilitator superfamily domain containing 2a) has been known to play an essential role in BBB formation and function. In this study, we investigated the role and underlying mechanisms of Mfsd2a in BBB permeability regulation after ICH. METHODS AND RESULTS Using ICH models, we found that Mfsd2a protein expression in perihematomal brain tissues was significantly decreased after ICH. Knockdown and knockout of Mfsd2a in mice markedly increased BBB permeability, neurological deficit score, and brain water contents after ICH, and these were rescued by overexpressing Mfsd2a in perihematomas. Moreover, we found that Mfsd2a regulation of BBB permeability after ICH correlated with changes in vesicle number. Expression profiling of tight junction proteins showed no differences in Mfsd2a knockdown, Mfsd2a knockout, and Mfsd2a overexpression mice. However, using electron microscopy following ICH, we observed a significant increase in pinocytotic vesicle number in Mfsd2a knockout mice and decreased the number of pinocytotic vesicles in mouse brains with Mfsd2a overexpression. Finally, using multiple reaction monitoring, we screened out 3 vesicle trafficking-related proteins (Srgap2, Stx7, and Sec22b) from 31 vesicle trafficking-related proteins that were markedly upregulated in Mfsd2a knockout mice compared with controls after ICH. CONCLUSIONS In summary, our results suggest that Mfsd2a may protect against BBB injury by inhibiting vesicular transcytosis following ICH.
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Affiliation(s)
- Yuan-Rui Yang
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Xiao-Yi Xiong
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Juan Liu
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Li-Rong Wu
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Qi Zhong
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Kai Zhou
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Zhao-You Meng
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Liang Liu
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Fa-Xiang Wang
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Qiu-Wen Gong
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Mao-Fan Liao
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Chun-Mei Duan
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Jie Li
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Mei-Hua Yang
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Qin Zhang
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Chang-Xiong Gong
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Qing-Wu Yang
- Department of Neurology, Xinqiao Hospital, The Third Military Medical University, Chongqing, China
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