Influence of in vitro supplementation with lipids from conventional and Alpine milk on fatty acid distribution and cell growth of HT-29 cells

Lipids in Health and Disease

Gerhard Jahreis²  Sven Dänicke¹  Katrin Kuhnt²  Sylvia Keller²  Alfred Lochner²  Christian Degen² 

[1] Institute of Animal Nutrition, Friedrich Loeffler Institute (FLI), Federal Research Institute for Animal Health, Braunschweig, Germany;Friedrich-Schiller-University, Institute of Nutrition, Dept. of Nutritional Physiology, Dornburger Str. 24, Jena, Germany

关键词: HT-29;    cancer cells;    cellular lipid distribution;    milk lipids;    Conjugated linoleic acid;   

Others  :  1212565
DOI  :  10.1186/1476-511X-10-131

 received in 2011-06-24, accepted in 2011-08-04,  发布年份 2011

【 摘 要 】

Background

To date, the influence of milk and dairy products on carcinogenesis remains controversial. However, lipids of ruminant origin such as conjugated linoleic acids (CLA) are known to exhibit beneficial effects in vitro and in vivo. The aim of the present study was to determine the influence of milk lipids of different origin and varying quality presenting as free fatty acid (FFA) solutions on cellular fatty acid distribution, cellular viability, and growth of human colon adenocarcinoma cells (HT-29).

Methods

FAME of conventional and Alpine milk lipids (ML_con, ML_alp) and cells treated with FFA derivatives of milk lipids were analyzed by means of GC-FID and Ag⁺-HPLC. Cellular viability and growth of the cells were determined by means of CellTiter-Blue^®-assay and DAPI-assay (4',6-diamidino-2-phenylindole dihydrochloride), respectively.

Results

Supplementation with milk lipids significantly decreased viability and growth of HT-29 cells in a dose- and time-dependent manner. ML_alp showed a lower SFA/MUFA ratio, a 8 fold increased CLA content, and different CLA profile compared to ML_con but did not demonstrate additional growth-inhibitory effects. In addition, total concentration and fatty acid distribution of cellular lipids were altered. In particular, treatment of the cells yielded highest amounts of two types of milk specific major fatty acids (μg FA/mg cellular protein) after 8 h of incubation compared to 24 h; 200 μM of ML_con (C16:0, 206 ± 43), 200 μM of ML_alp (C18:1 c9, (223 ± 19). Vaccenic acid (C18:1 t11) contained in milk lipids was converted to c9,t11-CLA in HT-29 cells. Notably, the ratio of t11,c13-CLA/t7,c9-CLA, a criterion for pasture feeding of the cows, was significantly changed after incubation for 8 h with lipids from ML_alp (3.6 - 4.8), compared to lipids from ML_con (0.3 - 0.6).

Conclusions

Natural lipids from conventional and Alpine milk showed similar growth inhibitory effects. However, different changes in cellular lipid composition suggested a milk lipid-depending influence on cell sensitivity. It is expected that similar changes may also be evident in other cell lines. To our knowledge, this is the first study showing a varied impact of complex milk lipids on fatty acid distribution in a colon cancer cell line.

【 授权许可】

   
2011 Degen et al; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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