Abstract
Sesamin is a sesame component with antihypertensive and antioxidative activities and has recently aroused much interest in studying its potential anticancer application. Macrophage is one of the infiltrating inflammatory cells in solid tumor and may promote tumor progression via enhancement of tumor angiogenesis. In this study, we investigated whether sesamin inhibited macrophage-enhanced proangiogenic activity of breast cancer cell lines MCF-7 and MDA-MB-231. Using vascular endothelial cell capillary tube and network formation assays, both breast cancer cell lines exhibited elevated proangiogenic activities after coculture with macrophages or pretreatment with macrophage-conditioned medium. This elevation of proangiogenic activity was drastically suppressed by sesamin. Vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP-9) induced by macrophages in both cell lines were also inhibited by sesamin. Nuclear levels of HIF-1α and NF-κB, important transcription factors for VEGF and MMP-9 expression, respectively, were obviously reduced by sesamin. VEGF induction by macrophage in MCF-7 cells was shown to be via ERK, JNK, phosphatidylinositol 3-kinase, and NF-κB-mediated pathways. These signaling molecules and additional p38MAPK were also involved in macrophage-induced MMP-9 expression. Despite such diverse pathways were induced by macrophage, only Akt and p38MAPK activities were potently inhibited by sesamin. Expression of interleukin (IL)-6, IL-8, and tumor necrosis factor-α were substantially increased and involved in macrophage-induced VEGF and MMP-9 mRNA expression in MCF-7 cells. Sesamin effectively inhibited the expression of these cytokines to avoid the reinforced induction of VEGF and MMP-9. In conclusion, sesamin potently inhibited macrophage-enhanced proangiogenic activity of breast cancer cells via inhibition of VEGF and MMP-9 induction.
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Abbreviations
- TAM:
-
Tumor-associated macrophage
- VEGF:
-
Vascular endothelial growth factor
- FGF:
-
Fibroblast growth factor
- IL:
-
Interleukin
- TNF-α:
-
Tumor necrosis factor-α
- TGF-β:
-
Transforming growth factor-β
- MMP:
-
Matrix metalloproteinases
- MϕCM:
-
Macrophage-conditioned medium
- MCFCM:
-
MCF-7 cell-conditioned medium
- MDACM:
-
MDA-MB-231 cell-conditioned medium
- PI3-K:
-
Phosphatidylinositol 3-kinase
- HUVECs:
-
Human umbilical vein endothelial cells
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Acknowledgments
This work was supported by the grants CA-097-PP-13 and CA-098-PP-10 from the National Health Research Institutes, the grant NSC96-2320-B-400-007 from the National Science Council, and the grants DOH97-TD-G-111-03 and DOH99-TD-C-111-004 from the Department of Health, Taiwan, Republic of China.
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Lee, CC., Liu, KJ., Wu, YC. et al. Sesamin Inhibits Macrophage-Induced Vascular Endothelial Growth Factor and Matrix Metalloproteinase-9 Expression and Proangiogenic Activity in Breast Cancer Cells. Inflammation 34, 209–221 (2011). https://doi.org/10.1007/s10753-010-9226-z
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DOI: https://doi.org/10.1007/s10753-010-9226-z