Metformin inhibits breast cancer cell growth, colony formation and induces cell cycle arrest in vitro

• Published in: Cell cycle (Georgetown, Tex.) Vol. 8; no. 6; pp. 909 - 915
• Main Authors: Alimova, Irina N., Liu, Bolin, Fan, Zeying, Edgerton, Susan M., Dillon, Thomas, Lind, Stuart E., Thor, Ann D.
• Format: Journal Article
• Language: English
• Published: United States Taylor & Francis 15-03-2009
• Subjects: Apoptosis; Binding; Biology; Bioscience; Breast Neoplasms - metabolism; Breast Neoplasms - pathology; Calcium; Cancer; Cell; Cell Cycle - drug effects; Cell Cycle - physiology; Cell Line, Tumor; Cell Proliferation - drug effects; Cycle; Humans; Hypoglycemic Agents - pharmacology; Landes; Metformin - pharmacology; Organogenesis; Proteins; Receptor, ErbB-2 - drug effects; Receptor, ErbB-2 - metabolism; Receptors, Estrogen - drug effects; Receptors, Estrogen - metabolism; Signal Transduction
• ISSN: 1538-4101; 1551-4005
• DOI: 10.4161/cc.8.6.7933

The anti-diabetic drug metformin reduces human cancer incidence and improves the survival of cancer patients, including those with breast cancer. We studied the activity of metformin against diverse molecular subtypes of breast cancer cell lines in vitro.  Metformin showed biological activity against all estrogen receptor (ER) positive and negative, erbB2 normal and abnormal breast cancer cell lines tested. It inhibited cellular proliferation, reduced colony formation and caused partial cell cycle arrest at the G1 checkpoint. Metformin did not induce apoptosis (as measured by DNA fragmentation and PARP cleavage) in luminal A, B or erbB2 subtype breast cancer cell lines. At the molecular level, metformin treatment was associated with a reduction of cyclin D1 and E2F1 expression with no changes in p27kip1 or p21waf1. It inhibited mitogen activated protein kinase (MAPK) and Akt activity, as well as the mammalian target of rapamycin (mTOR) in both ER positive and negative, erbB2-overexpressing and erbB2-normal expressing breast cancer cells. In erbB2-overexpressing breast cancer cell lines, metformin reduced erbB2 expression at higher concentrations, and at lower concentrations within the therapeutic range, it inhibited erbB2 tyrosine kinase activity evidenced by a reduction of phosphorylated erbB2 (P-erbB2) at both auto- and Src- phosphorylation sites. These data suggest that metformin may have potential therapeutic utility against ER positive and negative, erbB2-overexpressing and erbB2-normal expressing breast cancer cells.