Plasma Lipases And Lipid Transfer Proteins Increase Phospholipid But Not Free Cholesterol Transfer From Lipid Emulsion To High Density Lipoproteins

dc.creatorNunes V.S.
dc.creatorQuintao E.C.R.
dc.creatorCazita P.M.
dc.creatorHarada L.M.
dc.creatorDe Faria E.C.
dc.creatorOliveira H.C.F.
dc.date2001
dc.date2015-06-26T14:43:50Z
dc.date2015-11-26T14:17:18Z
dc.date2015-06-26T14:43:50Z
dc.date2015-11-26T14:17:18Z
dc.date.accessioned2018-03-28T21:18:23Z
dc.date.available2018-03-28T21:18:23Z
dc.identifier
dc.identifierBmc Biochemistry. , v. 2, n. , p. 1 - 9, 2001.
dc.identifier14712091
dc.identifier10.1186/1471-2091-2-1
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-3042841953&partnerID=40&md5=312f498af695339517ee5e1483c3f04a
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/95187
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/95187
dc.identifier2-s2.0-3042841953
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1243300
dc.descriptionBackground: Plasma lipases and lipid transfer proteins are involved in the generation and speciation of high density lipoproteins. In this study we have examined the influence of plasma lipases and lipid transfer protein activities on the transfer of free cholesterol (FC) and phospholipids (PL) from lipid emulsion to human, rat and mouse lipoproteins. The effect of the lipases was verified by incubation of labeled (3H-FC, 14C-PL) triglyceride rich emulsion with human plasma (control, post-heparin and post-heparin plus lipase inhibitor), rat plasma (control and post-heparin) and by the injection of the labeled lipid emulsion into control and heparinized functionally hepatectomized rats. Results: In vitro, the lipase enriched plasma stimulated significantly the transfer of 14C-PL from emulsion to high density lipoprotein (p<0.001) but did not modify the transfer of 3H-FC. In hepatectomized rats, heparin stimulation of intravascular lipolysis increased the plasma removal of 14C-PL and the amount of 14C-PL found in the low density lipoprotein density fraction but not in the high density lipoprotein density fraction. The in vitro and in vivo experiments showed that free cholesterol and phospholipids were transferred from lipid emulsion to plasma lipoproteins independently from each other. The incubation of human plasma, control and control plus monoclonal antibody anti-cholesteryl ester transfer protein (CETP), with 14C-PL emulsion showed that CETP increases 14C-PL transfer to human HDL, since its partial inhibition by the anti-CETP antibody reduced significantly the 14C-PL transfer (p<0.05). However, comparing the nontransgenic (no CETP activity) with the CETP transgenic mouse plasma, no effect of CETP on the 14C-PL distribution in mice lipoproteins was observed. Conclusions: It is concluded that: 1-intravascular lipases stimulate phospholipid transfer protein mediated phospholipid transfer, but not free cholesterol, from triglyceride rich particles to human high density lipoproteins and rat low density lipoproteins and high density lipoproteins; 2-free cholesterol and phospholipids are transferred from triglyceride rich particles to plasma lipoproteins by distinct mechanisms, and 3 - CETP also contributes to phospholipid transfer activity in human plasma but not in transgenic mice plasma, a species which has high levels of the specific phospholipid transfer protein activity.
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dc.languageen
dc.publisher
dc.relationBMC Biochemistry
dc.rightsaberto
dc.sourceScopus
dc.titlePlasma Lipases And Lipid Transfer Proteins Increase Phospholipid But Not Free Cholesterol Transfer From Lipid Emulsion To High Density Lipoproteins
dc.typeArtículos de revistas


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