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Plin2-deficiency reduces lipophagy and results in increased lipid accumulation in the heart

Identifieur interne : 000531 ( Main/Exploration ); précédent : 000530; suivant : 000532

Plin2-deficiency reduces lipophagy and results in increased lipid accumulation in the heart

Auteurs : Ismena Mardani [Suède] ; Knut Tomas Dalen [Norvège] ; Christina Drevinge [Suède] ; Azra Miljanovic [Suède] ; Marcus St Hlman [Suède] ; Martina Klevstig [Suède] ; Margareta Scharin T Ng [Suède] ; Per Fogelstrand [Suède] ; Max Levin [Suède] ; Matias Ekstrand [Suède] ; Syam Nair [Suède] ; Björn Redfors [Suède] ; Elmir Omerovic [Suède] ; Linda Andersson [Suède] ; Alan R. Kimmel [États-Unis] ; Jan Borén [Suède] ; Malin C. Levin [Suède]

Source :

RBID : PMC:6502866

Abstract

Myocardial dysfunction is commonly associated with accumulation of cardiac lipid droplets (LDs). Perilipin 2 (Plin2) is a LD protein that is involved in LD formation, stability and trafficking events within the cell. Even though Plin2 is highly expressed in the heart, little is known about its role in myocardial lipid storage. A recent report shows that cardiac overexpression of Plin2 result in massive myocardial steatosis suggesting that Plin2 stabilizes LDs. In this study, we hypothesized that deficiency in Plin2 would result in reduced myocardial lipid storage. In contrast to our hypothesis, we found increased accumulation of triglycerides in hearts, and specifically in cardiomyocytes, from Plin2−/− mice. Although Plin2−/− mice had markedly enhanced lipid levels in the heart, they had normal heart function under baseline conditions and under mild stress. However, after an induced myocardial infarction, stroke volume and cardiac output were reduced in Plin2−/− mice compared with Plin2+/+ mice. We further demonstrated that the increased triglyceride accumulation in Plin2-deficient hearts was caused by altered lipophagy. Together, our data show that Plin2 is important for proper hydrolysis of LDs.


Url:
DOI: 10.1038/s41598-019-43335-y
PubMed: 31061399
PubMed Central: 6502866


Affiliations:


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<author>
<name sortKey="Ekstrand, Matias" sort="Ekstrand, Matias" uniqKey="Ekstrand M" first="Matias" last="Ekstrand">Matias Ekstrand</name>
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<institution>Institute of Medicine, the Sahlgrenska Academy at University of Gothenburg and Sahlgrenska University Hospital,</institution>
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Gothenburg, Sweden</nlm:aff>
<country xml:lang="fr">Suède</country>
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<name sortKey="Nair, Syam" sort="Nair, Syam" uniqKey="Nair S" first="Syam" last="Nair">Syam Nair</name>
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<institution>The Sahlgrenska Academy at University of Gothenburg,</institution>
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Gothenburg, Sweden</nlm:aff>
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Gothenburg, Sweden</nlm:aff>
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<name sortKey="Omerovic, Elmir" sort="Omerovic, Elmir" uniqKey="Omerovic E" first="Elmir" last="Omerovic">Elmir Omerovic</name>
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Gothenburg, Sweden</nlm:aff>
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<name sortKey="Andersson, Linda" sort="Andersson, Linda" uniqKey="Andersson L" first="Linda" last="Andersson">Linda Andersson</name>
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Gothenburg, Sweden</nlm:aff>
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<wicri:regionArea>Gothenburg</wicri:regionArea>
</affiliation>
</author>
<author>
<name sortKey="Kimmel, Alan R" sort="Kimmel, Alan R" uniqKey="Kimmel A" first="Alan R." last="Kimmel">Alan R. Kimmel</name>
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<institution>National Institutes of Health,</institution>
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Bethesda, MD USA</nlm:aff>
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<name sortKey="Boren, Jan" sort="Boren, Jan" uniqKey="Boren J" first="Jan" last="Borén">Jan Borén</name>
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Gothenburg, Sweden</nlm:aff>
<country xml:lang="fr">Suède</country>
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</affiliation>
</author>
<author>
<name sortKey="Levin, Malin C" sort="Levin, Malin C" uniqKey="Levin M" first="Malin C." last="Levin">Malin C. Levin</name>
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<nlm:aff id="Aff1">
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<institution-id institution-id-type="ISNI">000000009445082X</institution-id>
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Gothenburg, Sweden</nlm:aff>
<country xml:lang="fr">Suède</country>
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<series>
<title level="j">Scientific Reports</title>
<idno type="eISSN">2045-2322</idno>
<imprint>
<date when="2019">2019</date>
</imprint>
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<front>
<div type="abstract" xml:lang="en">
<p id="Par1">Myocardial dysfunction is commonly associated with accumulation of cardiac lipid droplets (LDs). Perilipin 2 (Plin2) is a LD protein that is involved in LD formation, stability and trafficking events within the cell. Even though Plin2 is highly expressed in the heart, little is known about its role in myocardial lipid storage. A recent report shows that cardiac overexpression of Plin2 result in massive myocardial steatosis suggesting that Plin2 stabilizes LDs. In this study, we hypothesized that deficiency in Plin2 would result in reduced myocardial lipid storage. In contrast to our hypothesis, we found increased accumulation of triglycerides in hearts, and specifically in cardiomyocytes, from
<italic>Plin2</italic>
<sup>−/−</sup>
mice. Although
<italic>Plin2</italic>
<sup>−/−</sup>
mice had markedly enhanced lipid levels in the heart, they had normal heart function under baseline conditions and under mild stress. However, after an induced myocardial infarction, stroke volume and cardiac output were reduced in
<italic>Plin2</italic>
<sup>−/−</sup>
mice compared with
<italic>Plin2</italic>
<sup>+/+</sup>
mice. We further demonstrated that the increased triglyceride accumulation in Plin2-deficient hearts was caused by altered lipophagy. Together, our data show that Plin2 is important for proper hydrolysis of LDs.</p>
</div>
</front>
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<li>Norvège</li>
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<li>Maryland</li>
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<name sortKey="Ekstrand, Matias" sort="Ekstrand, Matias" uniqKey="Ekstrand M" first="Matias" last="Ekstrand">Matias Ekstrand</name>
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<name sortKey="Redfors, Bjorn" sort="Redfors, Bjorn" uniqKey="Redfors B" first="Björn" last="Redfors">Björn Redfors</name>
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