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Review
. 2017 Apr 29;22(5):705.
doi: 10.3390/molecules22050705.

Oleuropein and Cancer Chemoprevention: The Link is Hot

Affiliations
Review

Oleuropein and Cancer Chemoprevention: The Link is Hot

Ammad Ahmad Farooqi et al. Molecules. .

Abstract

Cancer comprises a collection of related diseases characterized by the existence of altered cellular pathways resulting in an abnormal tendency for uncontrolled growth. A broad spectrum, coordinated, and personalized approach focused on targeting diverse oncogenic pathways with low toxicity and economic natural compounds can provide a real benefit as a chemopreventive and/or treatment of this complex disease. Oleuropein, a bioactive phenolic compound mainly present in olive oil and other natural sources, has been reported to modulate several oncogenic signalling pathways. This review presents and critically discusses the available literature about the anticancer and onco-suppressive activity of oleuropein and the underlying molecular mechanisms implicated in the anticarcinogenic and therapeutic effects. The existence of limitations and the promising perspectives of research on this phenolic compound are also critically analyzed and discussed.

Keywords: cancer; chemopreventive effect; oleuropein; olive oil.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Chemical structure of oleuropein [19].
Figure 2
Figure 2
Various anticancer molecular mechanisms of oleuropein. (A) HER2 is proteolytically processed that is inhibited by oleuropein. Deacetoxyoleuropein aglycone inhibits activation of HER2. Malonyl-coenzyme A (CoA) plays a role in transcriptional repression of ERBB2 by facilitating entry of PEA3 in the nucleus. PEA3 binding sites are present within the promoter region of ERBB2. ERBB2 overexpressing breast cancer cells had lower levels of PEA3. As a result of oleuropein aglycone and oleuropein glycoside-mediated inhibition of FASN, higher levels of malonyl–CoA continue to be generated. Cytosolic accumulation of higher levels of malonyl-CoA triggered an increase and entry of PEA3 in the nucleus, where it occupied the PEA3 binding site and transcriptionally repressed ERBB2; (B) Hypoxia-inducible factor (HIFα) enters into the nucleus and transcriptionally represses miR-519d. miR-519d is involved in negative regulation of PDRG1 in cancer cells. However, treatment of cancer cells with oleuropein inhibits HIFα-mediated transcriptional repression of miR-519d and consequently miR-519d quantitatively inhibits PDRG1.
Figure 3
Figure 3
Pro-apoptotic molecular mechanisms of oleuropein in cancer cells. (a) Oleuropein mediated reduction of p-AKT levels. (b) Oleuropein enhanced p-JNK levels and reduced ERK1/2.

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