Email updates

Keep up to date with the latest news and content from BMC Complementary and Alternative Medicine and BioMed Central.

Open Access Research article

Dietary grape polyphenol resveratrol increases mammary tumor growth and metastasis in immunocompromised mice

Linette Castillo-Pichardo12, Luis A Cubano3 and Suranganie Dharmawardhane1*

  • * Corresponding author: Suranganie Dharmawardhane su.d@upr.edu

Author Affiliations

1 Department of Biochemistry, School of Medicine, University of Puerto Rico, Medical Sciences Campus, PO Box 365067, San Juan, Puerto Rico

2 Department of Pathology and Laboratory Medicine, Universidad Central del Caribe School of Medicine, Bayamon, Puerto Rico

3 Department of Anatomy and Cell Biology, Universidad Central del Caribe School of Medicine, Bayamon, Puerto Rico

For all author emails, please log on.

BMC Complementary and Alternative Medicine 2013, 13:6  doi:10.1186/1472-6882-13-6

Published: 8 January 2013

Abstract

Background

Resveratrol, a polyphenol from grapes and red wine has many health beneficial effects, including protection against cardiovascular and neurodegenerative diseases and cancer. However, our group and others have provided evidence for a dual cancer promoting or inhibitory role for resveratrol in breast cancer, dependent on estrogenic or antiestrogenic activities. Moreover, much of the inhibitory effects of resveratrol have been reported from studies with high non-physiological concentrations.

Methods

We investigated the effects of a range of concentrations (0.5, 5, 50 mg/kg body weight) of resveratrol on mammary tumor development post-initiation, using immunocompromised mice.

Results

Our findings suggest promotion of mammary tumor growth and metastasis by resveratrol at all concentrations tested in tumors derived from the low metastatic estrogen receptor (ER)α(-), ERβ(+) MDA-MB-231 and the highly metastatic ER(-) MDA-MB-435 cancer cell lines. Additionally, the activity of the migration/invasion regulator Rac, which we have previously shown to be regulated by resveratrol in vitro, was measured in tumors from resveratrol treated mice. Our results show a significant induction of tumoral Rac activity and a trend in increased expression of the Rac downstream effector PAK1 and other tumor promoting molecules following resveratrol treatment.

Conclusion

Taken together, our findings implicate low concentrations of resveratrol in potential promotion of breast cancer. Therefore, this study illuminates the importance of further delineating resveratrol’s concentration dependent effects, particularly in breast cancer, before it can be tested in the clinic or used as a dietary supplement for breast cancer patients.

Keywords:
Breast cancer; Resveratrol; Metastasis; Grape polyphenols; Rac