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        Borage (Borago officinalis) oil supplementation in relation to monocyte chemoattractant protein 1 expression in healthy subjects
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        Borage (Borago officinalis) oil supplementation in relation to monocyte chemoattractant protein 1 expression in healthy subjects
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Essential fatty acids (EFA) have unique roles as precursor molecules of chemical regulators of inflammatory cell function(13). In comparison with linoleic acid (18: 2n-6), γ-linolenic acid (GLA; 18: 3n-6) may have superior biopotency because the GLA bypasses the Δ6 desaturation, which is regarded as a key regulatory rate-limiting enzymic step controlling the formation of long-chain (LC) PUFA(4, 5). The present study investigated GLA-rich borage oil supplementation in relation to the monocyte chemoattractant protein 1 (MCP-1; CCL2) expression from peripheral blood mononuclear cells (PBMC) at the gene and protein levels in human subjects. Seven healthy volunteers who ingested 14 g borage oil/d consecutively for 13 weeks were studied. It was found that the MCP-1 production from both unstimulated and phytohaemagglutinin (PHA)-stimulated PBMC was reduced during the time-course of the intervention. Furthermore, MCP-1 from the PHA-stimulated PBMC decreased significantly during the 13 weeks of the intervention period. In addition, the level of PBMC MCP-1 gene expression was reduced significantly during the supplementation. A significant positive correlation was found between the expression of MCP-1 gene and MCP-1 production from both unstimulated (r 0.40, P<0.05; Figure (A)) and PHA-stimulated PBMCs (r 0.66, P<0.001; Figure (B)).

The study has, for the first time, revealed that GLA-rich borage oil supplementation in human subjects results in the inhibition of PBMC MCP-1 expression at the gene and protein levels. The suppressive effect of GLA-rich borage oil on PBMC MCP-1 expression may be beneficial to chronic inflammatory diseases.

1. Harbige, LS (2003) Lipids 38, 323341.
2. Kast, RE (2001) Int Immunopharmacol 1, 21972199.
3. Belch, JJ & Hill, A (2000) Am J Clin Nutr 71, Suppl., 352S356S.
4. Xiang, M, Harbige, LS & Zetterstrom, R (2007) Acta Paediatr 96, 387390.
5. Xiang, M, Rahman, MA, Ai, H, Li, X & Harbige, LS (2006) Ann Nutr Metab 50, 492498.