Effects of piroxicam and esculetin on the MDA-MB-231 human breast cancer cell line

Prostaglandins, Leukotrienes, and Essential Fatty Acids
M NoguchiT Sasaki

Abstract

We investigated the effects of piroxicam, esculetin, prostaglandin E2 (PGE2) and leukotriene B4 (LTB4) on a human breast cancer cell line (MDA-MB-231). Both piroxicam and esculetin suppressed cell growth and thymidine incorporation, though esculetin was more active in inhibiting cell growth in the presence of linoleic acid (LA). Esculetin reduced the secretion of LTB independent of LA. Piroxicam reduced the secretion of PGE in the absence of LA but only at higher concentrations in the presence of LA. When the relationship between cell growth and PGE and LTB concentration was evaluated by multivariate regression analysis, cell growth was associated with the PGE and LTB concentration when the cells were treated with esculetin alone or with esculetin and LA. Cell growth was associated only with the PGE concentration when they were treated with piroxicam alone or with piroxicam and LA. Therefore, it appears that the growth of MDA-MB-231 cells in vitro is affected by both lipoxygenase and cyclooxygenase products, though lipoxygenase inhibition is more active than cyclooxygenase inhibition on suppression of cell growth in the presence of LA.

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