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Xu X, Xu K, Chen F, Yu D, Wang X. Mfsd2a regulates the blood-labyrinth-barrier formation and function through tight junctions and transcytosis. Hear Res 2024; 450:109048. [PMID: 38852535 DOI: 10.1016/j.heares.2024.109048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 05/15/2024] [Accepted: 05/25/2024] [Indexed: 06/11/2024]
Abstract
The Blood-Labyrinth Barrier (BLB) is pivotal for the maintenance of lymphatic homeostasis within the inner ear, yet the intricacies of its development and function are inadequately understood. The present investigation delves into the contribution of the Mfsd2a molecule, integral to the structural and functional integrity of the Blood-Brain Barrier (BBB), to the ontogeny and sustenance of the BLB. Our empirical findings delineate that the maturation of the BLB in murine models is not realized until approximately two weeks post-birth, with preceding stages characterized by notable permeability. Transcriptomic analysis elucidates a marked augmentation in Mfsd2a expression within the lateral wall of the cochlea in specimens exhibiting an intact BLB. Moreover, both in vitro and in vivo assays substantiate that a diminution in Mfsd2a expression detrimentally impacts BLB permeability and structural integrity, principally via the attenuation of tight junction protein expression and the enhancement of endothelial cell transcytosis. These insights underscore the indispensable role of Mfsd2a in ensuring BLB integrity and propose it as a viable target for therapeutic interventions aimed at the amelioration of hearing loss.
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Affiliation(s)
- Xiaoju Xu
- Biobank of Clinical Research Center, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200100, China
| | - Ke Xu
- Biobank of Clinical Research Center, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200100, China
| | - Fengqiu Chen
- Biobank of Clinical Research Center, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200100, China
| | - Dehong Yu
- Materdicine Lab, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Xueling Wang
- Biobank of Clinical Research Center, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200100, China; Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China.
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Yu HT, Xu WH, Gong JY, Chen YF, He Y, Chen ST, Wu YY, Liu GL, Zhang HY, Xie L. Effect of high-fat diet on the fatty acid profiles of brain in offspring mice exposed to maternal gestational diabetes mellitus. Int J Obes (Lond) 2024; 48:849-858. [PMID: 38341506 DOI: 10.1038/s41366-024-01486-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 01/11/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024]
Abstract
OBJECTIVE Fatty acids play a critical role in the proper functioning of the brain. This study investigated the effects of a high-fat (HF) diet on brain fatty acid profiles of offspring exposed to maternal gestational diabetes mellitus (GDM). METHODS Insulin receptor antagonist (S961) and HF diet were used to establish the GDM animal model. Brain fatty acid profiles of the offspring mice were measured by gas chromatography at weaning and adulthood. Protein expressions of the fatty acid transport pathway Wnt3/β-catenin and the target protein major facilitator superfamily domain-containing 2a (MFSD2a) were measured in the offspring brain by Western blot. RESULTS Maternal GDM increased the body weight of male offspring (P < 0.05). In weaning offspring, factorial analysis showed that maternal GDM increased the monounsaturated fatty acid (MUFA) percentage of the weaning offspring's brain (P < 0.05). Maternal GDM decreased offspring brain arachidonic acid (AA), but HF diet increased brain linoleic acid (LA) (P < 0.05). Maternal GDM and HF diet reduced offspring brain docosahexaenoic acid (DHA), and the male offspring had higher DHA than the female offspring (P < 0.05). In adult offspring, factorial analysis showed that HF diet increased brain MUFA in offspring, and male offspring had higher brain MUFA than female offspring (P < 0.05). The HF diet increased brain LA in the offspring. Male offspring had higher level of AA than female offspring (P < 0.05). HF diet reduced DHA in the brains of female offspring. The brain protein expression of β-catenin and MFSD2a in both weaning and adult female offspring was lower in the HF + GDM group than in the CON group (P < 0.05). CONCLUSIONS Maternal GDM increased the susceptibility of male offspring to HF diet-induced obesity. HF diet-induced adverse brain fatty acid profiles in both male and female offspring exposed to GDM.
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Affiliation(s)
- Hai-Tao Yu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Wen-Hui Xu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Jia-Yu Gong
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yi-Fei Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yuan He
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Shu-Tong Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yan-Yan Wu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Guo-Liang Liu
- Experimental Teaching Center for Preventive Medicine, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Hai-Ying Zhang
- Experimental Teaching Center for Radiation Medicine, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Lin Xie
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China.
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