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Mechanisms Involved in the Improvement of Lipotoxicity and Impaired Lipid Metabolism by Dietary α-Linolenic Acid Rich Salvia hispanica L (Salba) Seed in the Heart of Dyslipemic Insulin-Resistant Rats

Department of Biochemistry, School of Biochemistry, University of Litoral, Ciudad Universitaria, Paraje El Pozo, CC 242, (3000) Santa Fe, Argentina
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Academic Editors: Lindsay Brown, Bernhard Rauch and Hemant Poudyal
J. Clin. Med. 2016, 5(2), 18; https://doi.org/10.3390/jcm5020018
Received: 5 November 2015 / Revised: 1 December 2015 / Accepted: 15 January 2016 / Published: 28 January 2016
(This article belongs to the Special Issue Omega-3 Fatty Acids in Health and Disease)
This study explores the mechanisms underlying the altered lipid metabolism in the heart of dyslipemic insulin-resistant (IR) rats fed a sucrose-rich diet (SRD) and investigates if chia seeds (rich in α-linolenic acid 18:3, n-3 ALA) improve/reverse cardiac lipotoxicity. Wistar rats received an SRD-diet for three months. Half of the animals continued with the SRD up to month 6. The other half was fed an SRD in which the fat source, corn oil (CO), was replaced by chia seeds from month 3 to 6 (SRD+chia). A reference group consumed a control diet (CD) all the time. Triglyceride, long-chain acyl CoA (LC ACoA) and diacylglycerol (DAG) contents, pyruvate dehydrogenase complex (PDHc) and muscle-type carnitine palmitoyltransferase 1 (M-CPT1) activities and protein mass levels of M-CPT1, membrane fatty acid transporter (FAT/CD36), peroxisome proliferator activated receptor α (PPARα) and uncoupling protein 2 (UCP2) were analyzed. Results show that: (a) the hearts of SRD-fed rats display lipotoxicity suggesting impaired myocardial lipid utilization; (b) Compared with the SRD group, dietary chia normalizes blood pressure; reverses/improves heart lipotoxicity, glucose oxidation, the increased protein mass level of FAT/CD36, and the impaired insulin stimulated FAT/CD36 translocation to the plasma membrane. The enhanced M-CPT1 activity is markedly reduced without similar changes in protein mass. PPARα slightly decreases, while the UCP2 protein level remains unchanged in all groups. Normalization of dyslipidemia and IR by chia reduces plasma fatty acids (FAs) availability, suggesting that a different milieu prevents the robust translocation of FAT/CD36. This could reduce the influx of FAs, decreasing the elevated M-CPT1 activity and lipid storage and improving glucose oxidation in cardiac muscles of SRD-fed rats. View Full-Text
Keywords: α-linolenic acid (ALA); cardiac muscle; lipotoxicity; dyslipidemia; insulin resistance; high-sucrose diet α-linolenic acid (ALA); cardiac muscle; lipotoxicity; dyslipidemia; insulin resistance; high-sucrose diet
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Creus, A.; Ferreira, M.R.; Oliva, M.E.; Lombardo, Y.B. Mechanisms Involved in the Improvement of Lipotoxicity and Impaired Lipid Metabolism by Dietary α-Linolenic Acid Rich Salvia hispanica L (Salba) Seed in the Heart of Dyslipemic Insulin-Resistant Rats. J. Clin. Med. 2016, 5, 18.

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