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Breast Cancer Research and Treatment

, Volume 37, Issue 1, pp 29–37 | Cite as

In vitro effects of eicosanoid synthesis inhibitors in the presence of linoleic acid on MDA-MB-231 human breast cancer cells

  • Mitsuharu Earashi
  • Masakuni Noguchi
  • Motohiro Tanaka
Report

Abstract

We investigated the effects of cyclooxygenase and lipoxygenase inhibitors in the presence of linoleic acid (LA), as well as the direct effects of prostaglandin E (PGE) and leukotriene B (LTB) on a human breast cancer cell line (MDA-MB-231)in vitro. Piroxicam, esculetin, and nordihydroguaiaretic acid (NDGA) suppressed cell growth and thymidine incorporation. However, a low concentration (1 µg/ml) of indomethacin (INDO) stimulated cell growth and thymidine incorporation, while a high concentration of INDO (30 µg/ml) inhibited both. Esculetin and NDGA reduced the secretion of LTB, whereas piroxicam reduced the secretion of PGE. INDO reduced the secretion of PGE, but a low concentration of INDO increased the secretion of LTB. Consequently, cell growth was correlated with the PGE and/or LTB concentrations when the cells were treated with these cyclooxygenase or lipoxygenase inhibitors. On the other hand, exogenous PGE2 partially reversed the inhibition of thymidine incorporation caused by INDO, whereas LTB4 exerted a similar effect in the case of esculetin or NDGA. The reversibility of the piroxicam effect with PGE2 is not convincing. Therefore, it is suggested that the growth of MDA-MB-231 cellsin vitro is affected by both the lipoxygenase and cyclooxygenase products, probably the other eicosanoids rather than PGE2 and LTB4.

Key words

breast cancer esculetin indomethacin linoleic acid NDGA piroxicam 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Mitsuharu Earashi
    • 1
  • Masakuni Noguchi
    • 1
    • 2
  • Motohiro Tanaka
    • 3
  1. 1.Department of Surgery (II)Kanazawa University Hospital, School of MedicineJapan
  2. 2.The Operation CenterKanazawa University Hospital, School of MedicineKanazawaJapan
  3. 3.Department of Experimental TherapeuticsCancer Research Institute, Kanazawa UniversityKanazawaJapan

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