title: Curcumin inhibition of integrin (alpha6beta4)-dependent breast cancer cell motility and invasion.
abstract: Curcumin, a polyphenol natural product isolated from the rhizome of the plant Curcuma longa, has emerged as a promising anticancer therapeutic agent. However, the mechanism by which curcumin inhibits cancer cell functions such as cell growth, survival, and cell motility is largely unknown. We explored whether curcumin affects the function of integrin alpha(6)beta(4), a laminin adhesion receptor with an established role in invasion and migration of cancer cells. Here we show that curcumin significantly reduced alpha(6)beta(4)-dependent breast cancer cell motility and invasion in a concentration-dependent manner without affecting apoptosis in MDA-MB-435/beta4 (beta(4)-integrin transfectants) and MDA-MB-231 breast cancer cell lines. Further, curcumin selectively reduced the basal phosphorylation of beta(4) integrin (Y1494), which has been reported to be essential in mediating alpha(6)beta(4)-dependent phosphatidylinositol 3-kinase activation and cell motility. Consistent with this finding, curcumin also blocked alpha(6)beta(4)-dependent Akt activation and expression of the cell motility-promoting factor ENPP2 in MDA-MB-435/beta4 cell line. A multimodality approach using curcumin in combination with other pharmacologic inhibitors of alpha(6)beta(4) signaling pathways showed an additive effect to block breast cancer cell motility and invasion. Taken together, these findings show that curcumin inhibits breast cancer cell motility and invasion by directly inhibiting the function of alpha(6)beta(4) integrin, and suggest that curcumin can serve as an effective therapeutic agent in tumors that overexpress alpha(6)beta(4).
authors.affiliation: Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
authors.forename: Hong Im
authors.initials: HI
authors.lastname: Kim
authors.forename: Huang
authors.initials: H
authors.lastname: Huang
authors.forename: Satish
authors.initials: S
authors.lastname: Cheepala
authors.forename: Shile
authors.initials: S
authors.lastname: Huang
authors.forename: Jun
authors.initials: J
authors.lastname: Chung
mesh_terms: D000971:Antineoplastic Combined Chemotherapy Protocols / Q000494:pharmacology / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000517:prevention & control; D002277:Carcinoma / Q000378:metabolism / Q000473:pathology* / Q000517:prevention & control; D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects* / Q000235:genetics; D003474:Curcumin / Q000008:administration & dosage / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D004791:Enzyme Inhibitors / Q000008:administration & dosage; D006801:Humans; D007211:Indoles / Q000008:administration & dosage / Q000494:pharmacology; D039161:Integrin alpha6beta4 / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D009361:Neoplasm Invasiveness; D051058:Oncogene Protein v-akt / Q000037:antagonists & inhibitors; D010766:Phosphorylation / Q000187:drug effects; D010879:Piperazines / Q000008:administration & dosage / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D013449:Sulfonamides / Q000008:administration & dosage / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: C478479:((3Z)-N-(3-chlorophenyl)-3-((3,5-dimethyl-4-((4-methylpiperazin-1-yl)carbonyl)-1H-pyrrol-2-yl)methylene)-N-methyl-2-oxo-2,3-dihydro-1H-indole-5-sulfonamide); D004791:Enzyme Inhibitors; D007211:Indoles; D039161:Integrin alpha6beta4; D010879:Piperazines; D013449:Sulfonamides; D051058:Oncogene Protein v-akt; D003474:Curcumin