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The Induction of Cytokine Release in Monocytes by Electronegative Low-Density Lipoprotein (LDL) Is Related to Its Higher Ceramide Content than Native LDL.

Abstract：

:Electronegative low-density lipoprotein (LDL(-)) is a minor modified LDL subfraction that is present in blood. LDL(-) promotes inflammation and is associated with the development of atherosclerosis. We previously reported that the increase of cytokine release promoted by this lipoprotein subfraction in monocytes is counteracted by high-density lipoprotein (HDL). HDL also inhibits a phospholipase C-like activity (PLC-like) intrinsic to LDL(-). The aim of this work was to assess whether the inhibition of the PLC-like activity by HDL could decrease the content of ceramide (CER) and diacylglycerol (DAG) generated in LDL(-). This knowledge would allow us to establish a relationship between these compounds and the inflammatory activity of LDL(-). LDL(-) incubated at 37 °C for 20 h increased its PLC-like activity and, subsequently, the amount of CER and DAG. We found that incubating LDL(-) with HDL decreased both products in LDL(-). Native LDL was modified by lipolysis with PLC or by incubation with CER-enriched or DAG-enriched liposomes. The increase of CER in native LDL significantly increased cytokine release, whereas the enrichment in DAG did not show these inflammatory properties. These data point to CER, a resultant product of the PLC-like activity, as a major determinant of the inflammatory activity induced by LDL(-) in monocytes.

journal_name

Int J Mol Sci

journal_title

International journal of molecular sciences

authors

Estruch M,Sanchez-Quesada JL,Beloki L,Ordoñez-Llanos J,Benitez S

doi

10.3390/ijms14022601

subject

Has Abstract

pub_date

2013-01-28 00:00:00

pages

2601-16

issue

2

issn

1422-0067

pii

ijms14022601

journal_volume

14

pub_type

杂志文章

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