Korean J Nutr.  2003 Apr;36(3):280-286.

Effects of Conjugated Linoleic Acid (CLA) on Matrix Metalloproteinase (MMP) Activity and Cell Motility in Human Colon Cancer Cell Lines

Affiliations
  • 1Department of Food Science and Nutrition, Dankook University, Seoul, Korea.
  • 2Division of Life Sciences, Hallym University, Chuncheon, Korea.

Abstract

Conjugated linoleic acid (CLA) consists of several geometric isomers of linoleic acid. CLA is found in foods derived from ruminants and exhibits strong anticarcinogenic effects in a variety of animal models. Matrix metalloproteinases (MMPs) play a key role in cancer progression. Specifically, MMP-2 and -9, which hydrolyze the basal membrane type IV collagen, are involved in the initial breakdown of collagen and basement membrane components during tumor growth and invasion. However, the effects of CLA on cancer cell motility and MMP expression and activity are not currently well known. Therefore, the present study examined whether CLA reduces the activity of MMP and cell motility in SW480 and SW620 cells, the human colon cancer cell lines. Gelatin zymography and Western blot analysis revealed that phorbol 12-myristate 13-acetate (PMA) induced the activity and protein expression of Mr 92,000 MMP-9 in both cell lines. To examine whether CLA inhibits the MMP activity, cells were incubated with 100 ngfmL PMA in the presence of various concentrations of CLA. PMA-induced MMP-9 activity was decreased by 20 micrometer CLA in SW480 cells, and by 10 micrometer and 20 micrometer CLA in SW620 cells. Results from the Hoyden chamber assay showed that cell motility was increased by PMA and that PMA-induced cell motility was significantly decreased by 20 micrometer CLA in SW480 cells. These results indicate that CLA may reduce the motility and MMP activity in human colon cancer cells.

Keyword

conjugated linoleic acid (CLA); matrix metalloproteinase (MMP); cell motility; zymography; colon cancer cells

MeSH Terms

Anticarcinogenic Agents
Basement Membrane
Blotting, Western
Cell Line*
Cell Movement*
Collagen
Collagen Type IV
Colon*
Colonic Neoplasms*
Gelatin
Humans*
Linoleic Acid*
Matrix Metalloproteinases
Membranes
Models, Animal
Ruminants
Anticarcinogenic Agents
Collagen
Collagen Type IV
Gelatin
Linoleic Acid
Matrix Metalloproteinases
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