NDLI: Hypofucosylation of Unc5b regulated by Fut8 enhances macrophage emigration and prevents atherosclerosis

Content Provider	Springer Nature : BioMed Central
Author	Yang, Xi Ma, Limei Zhang, Jun Chen, Linmu Zou, Zhen Shen, Di He, Hui Zhang, Lei Chen, Jun Yuan, Zhiyi Qin, Xia Yu, Chao
Abstract	Background Atherosclerosis (AS) is the leading underlying cause of the majority of clinical cardiovascular events. Retention of foamy macrophages in plaques is the main factor initiating and promoting the atherosclerotic process. Our previous work showed that ox-LDL induced macrophage retention in plaques and that the guidance receptor Uncoordinated-5 homolog B (Unc5b) was involved in this process. However, little is known about the role of Unc5b in regulating macrophage accumulation within plaques. Results In the present study, we found that Unc5b controls macrophage migration and thus promotes plaque progression in ApoE−/− mice. The immunofluorescence colocalization assay results first suggested that fucosyltransferase 8 (Fut8) might participate in the exacerbation of atherosclerosis. Animals with Unc5b overexpression showed elevated levels of Fut8 and numbers of macrophages and an increased lesion size and intimal thickness. However, these effects were reversed in ApoE−/− mice with Unc5b knockdown. Furthermore, Raw264.7 macrophages with siRNA-mediated silencing of Unc5b or overexpression of Unc5b were used to confirm the regulatory mechanisms of Unc5b and Fut8 in vitro. In response to ox-LDL exposure, Unc5b and Fut8 were both upregulated, and macrophages showed reduced pseudopod formation and migratory capacities. However, these capacities were restored by blocking Unc5b or Fut8. Furthermore, the IP assay indicated that Fut8 regulated the level of α-1,6 fucosylation of Unc5b, which mainly occurs in the endoplasmic reticulum (ER), and genetic deletion of the main fucosylation sites or Fut8 resulted in hypofucosylation of Unc5b. Moreover, the macrophage migration mediated by Unc5b depended on inactivation of the p-CDC42/p-PAK pathway. Conversely, macrophages with Unc5b overexpression displayed activation of the p-CDC42/p-PAK pathway and decreased migration both in vivo and in vitro. Conclusion These results demonstrated that hypofucosylation of Unc5b regulated by Fut8 is positively associated with the delay of the atherosclerotic process by promoting the migration of foamy macrophages. These findings identify a promising therapeutic target for atherosclerosis.
Related Links	https://cellandbioscience.biomedcentral.com/counter/pdf/10.1186/s13578-023-00959-y.pdf
Ending Page	13
Page Count	13
Starting Page	1
File Format	HTM / HTML
ISSN	20453701
DOI	10.1186/s13578-023-00959-y
Journal	Cell & Bioscience
Issue Number	1
Volume Number	13
Language	English
Publisher	BioMed Central
Publisher Date	2023-01-20
Access Restriction	Open
Subject Keyword	Cell Biology Microbiology Stem Cells Neurobiology Proteomics Unc5b Fut8 Fucosylation Macrophages Atherosclerosis
Content Type	Text
Resource Type	Article
Subject	Biochemistry, Genetics and Molecular Biology
Journal Impact Factor	6.1/2023
5-Year Journal Impact Factor	7/2023

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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