title: Phospholipid transfer protein deficiency decreases the content of S1P in HDL via the loss of its transfer capability.
abstract: Sphingosine-1-phosphate (S1P) is an amphiphilic signaling molecule, which is enriched in functional high density lipoprotein (HDL) and shows arterial protection. The distribution of S1P is changed with increased plasma phospholipid transfer protein (PLTP) activity and impaired HDL function in patients with coronary heart diseases. Therefore, we hypothesized that PLTP might transfer S1P among cells or lipoproteins. We found that plasma S1P contents were decreased by 60.1 % in PLTP knockout mice (PLTP-/-, N = 5) compared with their wild type littermates (WT, N = 5) (151.70 ± 38.59 vs. 379.32 ± 59.90 nmol/l, P<0.01). S1P content in HDL fraction (HDL-S1P) from PLTP-/- was decreased by 64.7 % compared with WT (49.36 ± 1.49 vs. 139.76 ± 2.94 nmol/l, P<0.01). The results of the S1P transfer assay indicated that PLTP could facilitate S1P transport from erythrocytes to HDL at 37 °C in D-Hanks buffer. Plasma content of apolipoprotein M, a specific adaptor of S1P, was not changed in PLTP-/- compared with WT. Therefore, we concluded that PLTP was a key factor to maintain plasma HDL-S1P, and PLTP deficiency could decrease the S1P content in plasma lipoproteins, which involves its capability of transferring S1P from erythrocyte to HDL.
authors.affiliation: Key Laboratory of Atherosclerosis in Universities of Shandong, Institute of Atherosclerosis, Taishan Medical University, 271000, Taian, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.forename: Shoudong
authors.initials: S
authors.lastname: Guo
authors.forename: Yumei
authors.initials: Y
authors.lastname: Feng
authors.forename: Lei
authors.initials: L
authors.lastname: Feng
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Cui
authors.forename: Guohua
authors.initials: G
authors.lastname: Song
authors.forename: Tian
authors.initials: T
authors.lastname: Luo
authors.forename: Ke
authors.initials: K
authors.lastname: Zhang
authors.forename: Yiwei
authors.initials: Y
authors.lastname: Wang
authors.forename: Xian-Cheng
authors.initials: XC
authors.lastname: Jiang
authors.forename: Shucun
authors.initials: S
authors.lastname: Qin
mesh_terms: D000818:Animals; D001053:Apolipoproteins / Q000097:blood / Q000378:metabolism; D000075243:Apolipoproteins M; D001692:Biological Transport; D004912:Erythrocytes / Q000378:metabolism; D008075:Lipoproteins, HDL / Q000097:blood* / Q000378:metabolism; D008246:Lysophospholipids / Q000097:blood* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D049294:Phospholipid Transfer Proteins / Q000235:genetics* / Q000378:metabolism; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism
chemical_list: C501623:ApoM protein, mouse; D001053:Apolipoproteins; D000075243:Apolipoproteins M; D008075:Lipoproteins, HDL; D008246:Lysophospholipids; D049294:Phospholipid Transfer Proteins; C510091:phospholipid transfer protein, mouse; C060506:sphingosine 1-phosphate; D013110:Sphingosine