Endothelial heparanase regulates heart metabolism by stimulating lipoprotein lipase secretion from cardiomyocytes.
Arterioscler Thromb Vasc Biol
; 33(5): 894-902, 2013 May.
Article
em En
| MEDLINE
| ID: mdl-23471235
ABSTRACT
OBJECTIVE:
After diabetes mellitus, transfer of lipoprotein lipase (LPL) from cardiomyocytes to the coronary lumen increases, and this requires liberation of LPL from the myocyte surface heparan sulfate proteoglycans with subsequent replenishment of this reservoir. At the lumen, LPL breaks down triglyceride to meet the increased demand of the heart for fatty acid. Here, we examined the contribution of coronary endothelial cells (ECs) toward regulation of cardiomyocyte LPL secretion. APPROACH ANDRESULTS:
Bovine coronary artery ECs were exposed to high glucose, and the conditioned medium was used to treat cardiomyocytes. EC-conditioned medium liberated LPL from the myocyte surface, in addition to facilitating its replenishment. This effect was attributed to the increased heparanase content in EC-conditioned medium. Of the 2 forms of heparanase secreted from EC in response to high glucose, active heparanase released LPL from the myocyte surface, whereas latent heparanase stimulated reloading of LPL from an intracellular pool via heparan sulfate proteoglycan-mediated RhoA activation.CONCLUSIONS:
Endothelial heparanase is a participant in facilitating LPL increase at the coronary lumen. These observations provide an insight into the cross-talk between ECs and cardiomyocytes to regulate cardiac metabolism after diabetes mellitus.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Miócitos Cardíacos
/
Células Endoteliais
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Glucuronidase
/
Lipase Lipoproteica
Limite:
Animals
Idioma:
En
Revista:
Arterioscler Thromb Vasc Biol
Assunto da revista:
ANGIOLOGIA
Ano de publicação:
2013
Tipo de documento:
Article