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Docosapentaenoic acid (22:5n-3) down-regulates the expression of genes involved in fat synthesis in liver cells

Kaur, Gunveen, Sinclair, Andrew J, Cameron-Smith, David, Barr, Daniel P, Molero-Navajas, Juan C and Konstantopoulos, Nicky (2011) Docosapentaenoic acid (22:5n-3) down-regulates the expression of genes involved in fat synthesis in liver cells. Prostaglandins, Leukotrienes and Essential Fatty Acids, 85 (3-4). pp. 155-161. ISSN 0952-3278 (print), 1532-2823 (online)

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Previous studies have shown that Eicosapentaenoic Acid (EPA) and Docosahexaenoic Acid (DHA) exhibit triacylglycerol (TAG) lowering effect in vitro and in vivo by down-regulating the Sterol Regulating Element Binding Protein (SREBP-1c) and reducing the expression levels of lipogenic genes. However, there is no evidence on the effect of Docosapentaenoic Acid (DPA) on SREBP-1c expression levels. DPA is a long chain n-3 fatty acid present in our diet through fish, red meat and milk of ruminant animals. Therefore, this study aimed to elucidate the effect of DPA on liver fatty acid synthesis in an in vitro model using rat liver cells. Our results suggested that DPA incubation (50 μM) for 48 h (like EPA and DHA) caused a significant decrease in the mRNA expression levels of SREBP-1c, 3-Hydroxy-3-Methyl-Glutaryl-Coenzyme A reductase (HMG-CoA reductase), Acetyl Coenzyme A Carboxylase (ACC-1) and Fatty Acid Synthase (FASn) compared with Oleic Acid (OA) and also a decrease in the protein levels of SREBP-1 and ACC-1. A time-course fatty acid analysis showed that DPA and EPA are interconvertable in the cells; however, after 8 h of incubation with DPA, the cell phospholipids contained mainly DPA. The gene expression profiling of the lipogenic genes repeated at 8 h confirmed that the inhibitory effect of DPA on mRNA expression levels of the lipogenic genes was most likely due to DPA itself and not due to its conversion into EPA.

Item Type: Article
Uncontrolled Keywords: n-3 Polyunsaturated fatty acids, PUFA, docosapentaenoic acid, DPA, eicosapentaenoic acid, EPA, docosahexaenoic acid, DHA, fatty acid synthesis, lipogenic genes
Subjects: Current > FOR Classification > 1101 Medical Biochemistry and Metabolomics
Current > FOR Classification > 1111 Nutrition and Dietetics
Historical > Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
Depositing User: VUIR
Date Deposited: 21 Jan 2013 05:41
Last Modified: 23 May 2013 17:00
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Citations in Scopus: 37 - View on Scopus

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