ApoM-S1P Modulates Ox-LDL-Induced Inflammation Through the PI3K/Akt Signaling Pathway in HUVECs.

Abstract:

:Studies have shown that apolipoprotein M (apoM), the main carrier of sphingosine-1-phosphate (S1P), is closely related to lipid metabolism and inflammation. While there are many studies on apoM and lipid metabolism, little is known about the role of apoM in inflammation. Atherosclerosis is a chronic inflammatory process. To clarify what role apoM plays in atherosclerosis, we used oxidized low-density lipoprotein (ox-LDL) to induce an inflammatory model of atherosclerosis. Our preliminary results indicate that ox-LDL upregulates the expression of S1P receptor 2 (S1PR2) in human umbilical vein endothelial cells (HUVECs). Ox-LDL-induced HUVECs were treated with apoM-bound S1P (apoM-S1P), free S1P or apoM, and apoM-S1P was found to significantly inhibit the expression of inflammatory factors and adhesion molecules. In addition, apoM-S1P inhibits ox-LDL-induced cellular inflammation via S1PR2. Moreover, apoM-S1P induces phosphorylation of phosphatidylinositol 3-kinase (PI3K)/Akt, preventing nuclear translocation of nuclear factor-κB (NF-κB). PI3K-specific inhibitors and Akt inhibitors suppress apoM-S1P/S1PR2-induced interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) release and affect nuclear translocation of NF-κB. In conclusion, the results demonstrate for the first time that apoM-S1P inhibits ox-LDL-induced inflammation in HUVECs via the S1PR2-mediated PI3K/Akt signaling pathway. This finding may aid in the development of new treatments for atherosclerosis.

journal_name

Inflammation

journal_title

Inflammation

authors

Zheng Z,Zeng Y,Zhu X,Tan Y,Li Y,Li Q,Yi G

doi

10.1007/s10753-018-0918-0

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

606-617

issue

2

eissn

0360-3997

issn

1573-2576

pii

10.1007/s10753-018-0918-0

journal_volume

42

pub_type

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