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Breast Cancer Research and Treatment

, Volume 85, Issue 2, pp 103–110 | Cite as

Naringenin Inhibits Glucose Uptake in MCF-7 Breast Cancer Cells: A Mechanism for Impaired Cellular Proliferation

  • Anne W. Harmon
  • Yashomati M. PatelEmail author
Article

Abstract

Certain flavonoids inhibit glucose uptake in cultured cells. In this report, we show that the grapefruit flavanone naringenin inhibited insulin-stimulated glucose uptake in proliferating and growth-arrested MCF-7 breast cancer cells. Our findings indicate that naringenin inhibits the activity of phosphoinositide 3-kinase (PI3K), a key regulator of insulin-induced GLUT4 translocation, as shown by impaired phosphorylation of the downstream signaling molecule Akt. Naringenin also inhibited the phosphorylation of p44/p42 mitogen-activated protein kinase (MAPK). Inhibition of the MAPK pathway with PD98059, a MAPK kinase inhibitor, reduced insulin-stimulated glucose uptake by approximately 60%. The MAPK pathway therefore appears to contribute significantly to insulin-stimulated glucose uptake in breast cancer cells. Importantly, decreasing the availability of glucose by lowering the glucose concentration of the culture medium inhibited proliferation, as did treatment with naringenin. Collectively, our findings suggest that naringenin inhibits the proliferation of MCF-7 cells via impaired glucose uptake. Because a physiologically attainable dose of 10 µM naringenin reduced insulin-stimulated glucose uptake by nearly 25% and also reduced cell proliferation, naringenin may possess therapeutic potential as an anti-proliferative agent.

Akt breast cancer grapefruit mitogen-activated protein kinase phosphoinositide 3-kinase 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Department of NutritionUniversity of North Carolina School of Public HealthChapel HillUSA

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