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Subclinical atherosclerosis and its progression are modulated by PLIN2 through a feed-forward loop between LXR and autophagy

Saliba-Gustafsson, P. ; Pedrelli, M. ; Gertow, K. ; Werngren, O. ; Janas, V. ; Pourteymour, S. ; Baldassarre, D. ; Tremoli, E. ; Veglia, F. and Rauramaa, R. , et al. (2019) In Journal of Internal Medicine 286(6). p.660-675
Abstract

Background: Hyperlipidaemia is a major risk factor for cardiovascular disease, and atherosclerosis is the underlying cause of both myocardial infarction and stroke. We have previously shown that the Pro251 variant of perilipin-2 reduces plasma triglycerides and may therefore be beneficial to reduce atherosclerosis development. Objective: We sought to delineate putative beneficial effects of the Pro251 variant of perlipin-2 on subclinical atherosclerosis and the mechanism by which it acts. Methods: A pan-European cohort of high-risk individuals where carotid intima-media thickness has been assessed was adopted. Human primary monocyte-derived macrophages were prepared from whole blood from individuals recruited by perilipin-2 genotype or... (More)

Background: Hyperlipidaemia is a major risk factor for cardiovascular disease, and atherosclerosis is the underlying cause of both myocardial infarction and stroke. We have previously shown that the Pro251 variant of perilipin-2 reduces plasma triglycerides and may therefore be beneficial to reduce atherosclerosis development. Objective: We sought to delineate putative beneficial effects of the Pro251 variant of perlipin-2 on subclinical atherosclerosis and the mechanism by which it acts. Methods: A pan-European cohort of high-risk individuals where carotid intima-media thickness has been assessed was adopted. Human primary monocyte-derived macrophages were prepared from whole blood from individuals recruited by perilipin-2 genotype or from buffy coats from the Karolinska University hospital blood central. Results: The Pro251 variant of perilipin-2 is associated with decreased intima-media thickness at baseline and over 30 months of follow-up. Using human primary monocyte-derived macrophages from carriers of the beneficial Pro251 variant, we show that this variant increases autophagy activity, cholesterol efflux and a controlled inflammatory response. Through extensive mechanistic studies, we demonstrate that increase in autophagy activity is accompanied with an increase in liver-X-receptor (LXR) activity and that LXR and autophagy reciprocally activate each other in a feed-forward loop, regulated by CYP27A1 and 27OH-cholesterol. Conclusions: For the first time, we show that perilipin-2 affects susceptibility to human atherosclerosis through activation of autophagy and stimulation of cholesterol efflux. We demonstrate that perilipin-2 modulates levels of the LXR ligand 27OH-cholesterol and initiates a feed-forward loop where LXR and autophagy reciprocally activate each other; the mechanism by which perilipin-2 exerts its beneficial effects on subclinical atherosclerosis.

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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
27OH-cholesterol, atherosclerosis, autophagy, liver-X-receptor, PLIN2
in
Journal of Internal Medicine
volume
286
issue
6
pages
16 pages
publisher
Wiley-Blackwell Publishing Ltd
external identifiers
  • pmid:31251843
  • scopus:85074964835
ISSN
0954-6820
DOI
10.1111/joim.12951
language
English
LU publication?
yes
id
95c10b9c-1e9f-44a3-bc04-d77fe96b5c78
date added to LUP
2019-11-28 12:47:13
date last changed
2020-09-30 06:28:45
@article{95c10b9c-1e9f-44a3-bc04-d77fe96b5c78,
  abstract     = {<p>Background: Hyperlipidaemia is a major risk factor for cardiovascular disease, and atherosclerosis is the underlying cause of both myocardial infarction and stroke. We have previously shown that the Pro251 variant of perilipin-2 reduces plasma triglycerides and may therefore be beneficial to reduce atherosclerosis development. Objective: We sought to delineate putative beneficial effects of the Pro251 variant of perlipin-2 on subclinical atherosclerosis and the mechanism by which it acts. Methods: A pan-European cohort of high-risk individuals where carotid intima-media thickness has been assessed was adopted. Human primary monocyte-derived macrophages were prepared from whole blood from individuals recruited by perilipin-2 genotype or from buffy coats from the Karolinska University hospital blood central. Results: The Pro251 variant of perilipin-2 is associated with decreased intima-media thickness at baseline and over 30 months of follow-up. Using human primary monocyte-derived macrophages from carriers of the beneficial Pro251 variant, we show that this variant increases autophagy activity, cholesterol efflux and a controlled inflammatory response. Through extensive mechanistic studies, we demonstrate that increase in autophagy activity is accompanied with an increase in liver-X-receptor (LXR) activity and that LXR and autophagy reciprocally activate each other in a feed-forward loop, regulated by CYP27A1 and 27OH-cholesterol. Conclusions: For the first time, we show that perilipin-2 affects susceptibility to human atherosclerosis through activation of autophagy and stimulation of cholesterol efflux. We demonstrate that perilipin-2 modulates levels of the LXR ligand 27OH-cholesterol and initiates a feed-forward loop where LXR and autophagy reciprocally activate each other; the mechanism by which perilipin-2 exerts its beneficial effects on subclinical atherosclerosis.</p>},
  author       = {Saliba-Gustafsson, P. and Pedrelli, M. and Gertow, K. and Werngren, O. and Janas, V. and Pourteymour, S. and Baldassarre, D. and Tremoli, E. and Veglia, F. and Rauramaa, R. and Smit, A. J. and Giral, P. and Kurl, S. and Pirro, M. and de Faire, U. and Humphries, S. E. and Hamsten, A. and Gonçalves, I. and Orho-Melander, M. and Franco-Cereceda, A. and Borén, J. and Eriksson, P. and Magné, J. and Parini, P. and Ehrenborg, E.},
  issn         = {0954-6820},
  language     = {eng},
  number       = {6},
  pages        = {660--675},
  publisher    = {Wiley-Blackwell Publishing Ltd},
  series       = {Journal of Internal Medicine},
  title        = {Subclinical atherosclerosis and its progression are modulated by PLIN2 through a feed-forward loop between LXR and autophagy},
  url          = {http://dx.doi.org/10.1111/joim.12951},
  doi          = {10.1111/joim.12951},
  volume       = {286},
  year         = {2019},
}