title: Increased endostatin generation and decreased angiogenesis via MMP-9 by tamoxifen in hormone dependent ovarian cancer.
abstract: There are several similarities between breast and ovarian cancer but anti-estrogen treatment is rarely used in ovarian cancer. We have previously shown that the most widely used anti-estrogen tamoxifen increased MMP-9 activity and endostatin generation in breast cancer. Here, we show that tamoxifen exposure of highly hormone responsive ovarian cancer cells decreased proliferation, and increased MMP-9 activity leading to increased levels of endostatin both in cell culture in vitro and in solid tumors of nude mice. Tamoxifen exposed tumors also exhibited significantly decreased tumor growth and vascularisation. Moreover, in ascites from ovarian cancer patients, MMP-9 was undetectable in majority of cases but a significant correlation of MMP-2 and endostatin was found. The effects on MMPs and endostatin generation are previously unknown mechanisms of estradiol and tamoxifen in ovarian cancer, which may have therapeutic implications in future anti-cancer options of hormone dependent ovarian cancer.
authors: Faculty of Health Sciences, Department of Clinical and Experimental Medicine, Division of Oncology, Linköping University, Linköping, Sweden.
authors: Christina
authors: C
authors: Bendrik
authors: Lisa
authors: L
authors: Karlsson
authors: Charlotta
authors: C
authors: Dabrosin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D018931:Antineoplastic Agents, Hormonal / Q000494:pharmacology*; D001201:Ascites / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D043169:Endostatins / Q000096:biosynthesis*; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D006801:Humans; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008875:Middle Aged; D009368:Neoplasm Transplantation; D009376:Neoplasms, Hormone-Dependent / Q000188:drug therapy*; D009389:Neovascularization, Pathologic / Q000188:drug therapy*; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000378:metabolism; D013629:Tamoxifen / Q000494:pharmacology*
chemical_list: D018931:Antineoplastic Agents, Hormonal; D043169:Endostatins; D013629:Tamoxifen; D004958:Estradiol; D020780:Matrix Metalloproteinase 9