Stimulatory effect of arachidonic acid on T-47D human breast cancer cell growth is associated with enhancement of cyclin D1 mRNA expression.
Experimental and human studies have provided evidence that a high intake of n-6 polyunsaturated fatty acids stimulates mammary carcinogenesis. Arachidonic acid, an n-6fatty acid consumed in the diet or derived from dietary linoleic acid, is thought to play a key role in enhancement of mammary tumor development. In this study, we investigated the effects of arachidonic acid on T-47D breast cancer cell growth, cell cycle progression, and the expression of cyclin D1 mRNA. Our data show that arachidonic acid stimulated the growth of T-47D cells with a twofold stimulation at 5 microg/ml. This effect was associated with an increase in the proportion of cells in the S phase of the cell cycle and preceded by stimulation of the expression of cyclin D1 mRNA, with maximal induction at 5 microg/ml. Cyclin D1 mRNA levels were increased within two hours of treatment and were maximal at five hours. These results suggest that arachidonic acid may exert a stimulatory effect on breast cancer cell growth and that this effect possibly involves the induction of cyclin D1 gene expression leading to cell cycle progression.
Razanamahefa
L
L
Laboratoire de Nutrition et Sécurité Alimentaire, Institut National de la Recherche Agronomique, Jouy-en-Josas, France.
Prouff
S
S
Bardon
S
S
D016718:Arachidonic Acid / Q000008:administration & dosage* / Q000493:pharmacokinetics; D001943:Breast Neoplasms / Q000209:etiology* / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects*; D019938:Cyclin D1 / Q000235:genetics / Q000378:metabolism*; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage* / Q000493:pharmacokinetics; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D012333:RNA, Messenger / Q000378:metabolism; D016196:S Phase / Q000187:drug effects; D014407:Tumor Cells, Cultured
D004042:Dietary Fats, Unsaturated; D012333:RNA, Messenger; D019938:Cyclin D1; D016718:Arachidonic Acid