Ellagic Acid Inhibits VEGF/VEGFR2, PI3K/Akt and MAPK Signaling Cascades in the Hamster Cheek Pouch Carcinogenesis Model

ISSN: 1875-5992 (Online)
ISSN: 1871-5206 (Print)


Volume 14, 10 Issues, 2014


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Anti-Cancer Agents in Medicinal Chemistry

Formerly: Current Medicinal Chemistry - Anti-Cancer Agents

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  • 85th of 202 in Oncology

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Editor-in-Chief:
Michelle Prudhomme
Universite Blaise Pascal - C.N.R.S
Aubiere Cedex
France


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Ellagic Acid Inhibits VEGF/VEGFR2, PI3K/Akt and MAPK Signaling Cascades in the Hamster Cheek Pouch Carcinogenesis Model

Author(s): Jaganathan Kowshik, Hemant Giri, Tanagala Kranthi Kiran Kishore, Rushendhiran Kesavan, Raju Naik Vankudavath, Geereddy Bhanuprakash Reddy, Madhulika Dixit and Siddavaram Nagini

Affiliation: Department of Biochemistry and Biotechnology, Faculty of Science, Annamalai University, Annamalainagar- 608 002, Tamil Nadu, India.

Abstract

Background: Blocking vascular endothelial growth factor (VEGF) mediated tumor angiogenesis by phytochemicals has emerged as an attractive strategy for cancer prevention and therapy.

Methods: We investigated the anti-angiogenic effects of ellagic acid in a hamster model of oral oncogenesis by examining the transcript and protein expression of hypoxia-inducible factor-1alpha (HIF-1α), VEGF, VEGFR2, and the members of the PI3K/Akt and MAPK signaling cascades. Molecular docking studies and cell culture experiments with the endothelial cell line ECV304 were performed to delineate the mechanism by which ellagic acid regulates VEGF signaling.

Results: We found that ellagic acid significantly inhibits HIF-1α-induced VEGF/VEGFR2 signalling in the hamster buccal pouch by abrogating PI3K/Akt and MAPK signaling via downregulation of PI3K, PDK-1, p-Aktser473, mTOR, p-ERK, and p-JNK. Ellagic acid was also found to reduce the expression of histone deacetylases that could inhibit neovascularization. Analysis of the mechanism revealed that ellagic acid inhibits hypoxia-induced angiogenesis via suppression of HDAC-6 in ECV304 cells. Furthermore, knockdown of endogenous HDAC6 via small interfering RNA abrogated hypoxia-induced expression of HIF-1α and VEGF and blocked Akt activation. Molecular docking studies confirmed interaction of ellagic acid with upstream kinases that regulate angiogenic signaling.

Conclusions: Taken together, these findings demonstrate that the anti-angiogenic activity of ellagic acid may be mediated by abrogation of hypoxia driven PI3K/Akt/mTOR, MAPK and VEGF/VEGFR2 signaling pathways involving suppression of HDAC6 and HIF-1α responses.

General Significance: Ellagic acid offers promise as a lead compound for anticancer therapeutics by virtue of its ability to inhibit key oncogenic signaling cascades and HDACs.





Keywords: Angiogenesis, ellagic acid, hamster buccal pouch, histone deacetylases, protein kinases, vascular endothelial growth factor.

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Article Details

Volume: 14
Issue Number: 9
First Page: 1249
Last Page: 1260
Page Count: 12
DOI: 10.2174/1871520614666140723114217
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