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Conjugated linoleic acid (CLA)-enriched milk fat inhibits growth and modulates CLA-responsive biomarkers in MCF-7 and SW480 human cancer cell lines

Published online by Cambridge University Press:  09 March 2007

Áine Miller ,
Catherine Stanton ,
John Murphy  and
Rosaleen Devery
Áine Miller
Affiliation:
School of Biotechnology, Dublin City University, Dublin 9, Republic of Ireland
Catherine Stanton
Affiliation:
Teagasc Dairy Products Research Centre, Moorepark, Fermoy, Co. Cork, Republic of Ireland
John Murphy
Affiliation:
Teagasc Dairy Production Department, Moorepark, Fermoy, Co. Cork, Republic of Ireland
Rosaleen Devery*
Affiliation:
School of Biotechnology, National Institute of Cellular Biotechnology, Dublin City University, Glasnevin, Dublin 9, Republic of Ireland
*
*Corresponding author: Dr Rosaleen Devery, fax +353 1 7005412, email [email protected]
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Abstract

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Milk enriched in conjugated linoleic acid (CLA) was obtained from cows on pasture supplemented with full-fat rapeseeds (FFR; 2·26g cis 9, trans 11 (c9, t11)-CLA/100g fatty acid methyl esters) and full-fat soyabeans (1·83g c9, t11-CLA/100g fatty acid methyl esters). A control milk fat (1·69g c9, t11-CLA/100g fatty acid methyl esters) was obtained from cows fed on pasture only. The present study assessed the potency of the CLA-enriched milk fats to modulate biomarkers that had previously been observed to respond to c9, t11-CLA in the MCF-7 and SW480 cell lines. Cell numbers decreased (P<0·05) by up to 61 and 58% following the incubation of MCF-7 and SW480 cells, respectively, for 4d with milk fats (yielding CLA concentrations between 60·2 and 80·6μM). The FFR milk fat, containing the highest CLA content, increased (P<0·05) [14C]arachidonic acid (AA) uptake into the monoacylglycerol fraction of MCF-7 and SW480 cells while it decreased (P<0·05) uptake into the phospholipid fraction of the latter. This milk fat also decreased (P<0·05) [14C]AA conversion to prostaglandin (PG) E2 while increasing conversion to PGF2α in both cell lines. All milk-fat samples increased (P<0·05) lipid peroxidation as measured by 8-epi-PGF2α in both cell lines. In SW480 cells the milk-fat samples decreased (P<0·05) bcl-2 and cytosolic glutathione levels while increasing (P<0·05) membrane-associated annexin V levels. All milk-fat samples decreased (P<0·05) the expression of ras in SW480 cells. These data suggest that milk-fat CLA was effective at modulating synthetic CLA-responsive biomarkers.

Keywords

Milk fatConjugated linoleic acidEicosanoidsApoptosis
Type
Research Article
Information
British Journal of Nutrition , Volume 90 , Issue 5 , November 2003 , pp. 877 - 885
Copyright
Copyright © The Nutrition Society 2003

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