Targeting cholesteryl ester accumulation in the heart improves cardiac insulin response - 18/06/22
, Vicenta Llorente-Cortés c, d, h, ⁎, 3 Abstract |
Background |
Antibodies against the P3 sequence (Gly1127-Cys1140) of LRP1 (anti-P3 Abs) specifically block cholesteryl ester (CE) accumulation in vascular cells. LRP1 is a key regulator of insulin receptor (InsR) trafficking in different cell types. The link between CE accumulation and the insulin response are largely unknown. Here, the effects of P3 peptide immunization on the alterations induced by a high-fat diet (HFD) in cardiac insulin response were evaluated.
Methods |
Irrelevant (IrP)- or P3 peptide-immunized rabbits were randomized into groups fed either HFD or normal chow. Cardiac lipid content was characterized by thin-layer chromatography, confocal microscopy, and electron microscopy. LRP1, InsR and glucose transporter type 4 (GLUT4) levels were determined in membranes and total lysates from rabbit heart. The interaction between InsR and LRP1 was analyzed by immunoprecipitation and confocal microscopy. Insulin signaling activity and glucose uptake were evaluated in HL-1 cells exposed to rabbit serum from the different groups.
Findings |
HFD reduces cardiac InsR and GLUT4 membrane levels and the interactions between LRP1/InsR. Targeting the P3 sequence on LRP1 through anti-P3 Abs specifically reduces CE accumulation in the heart independently of changes in the circulating lipid profile. This restores InsR and GLUT4 levels in cardiac membranes as well as the LRP1/InsR interactions of HFD-fed rabbits. In addition, anti-P3 Abs restores the insulin signaling cascade and glucose uptake in HL-1 cells exposed to hypercholesterolemic rabbit serum.
Interpretation |
LRP1-immunotargeting can block CE accumulation within the heart with specificity, selectivity, and efficacy, thereby improving the cardiac insulin response; this has important therapeutic implications for a wide range of cardiac diseases.
Funding |
Fundació MARATÓ TV3: grant 101521-10, Instiuto de Salud Carlos III (ISCIII) and ERDF PI18/01584, Fundación BBVA Ayudas a Equipos de Investigación 2019. SECyT-UNC grants PROYECTOS CONSOLIDAR 2018-2021; FONCyT, Préstamo BID PICT grant 2015-0807 and grant 2017-4497.
Le texte complet de cet article est disponible en PDF.Graphical Abstract |
Highlights |
• | LRP1 plays a crucial role in cholesteryl ester (CE) accumulation in cardiomyocytes. |
• | LRP1 immunotargeting blocks myocardial CE accumulation independently of blood and hepatic lipids. |
• | Targeting cardiomyocyte CE accumulation improves cardiac insulin response. |
• | P3 immunization changes the ultrastructure of lipid droplets in the heart. |
Keywords : High-fat diet, Lipid droplets, Cholesteryl esters, Heart, Lipoprotein, Insulin, LRP1
Plan
Vol 152
Article 113270- août 2022 Retour au numéro
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