title: Protein tyrosine phosphatase receptor type O expression in the tumor niche correlates with reduced tumor growth, angiogenesis, circulating tumor cells and metastasis of breast cancer.
abstract: Protein tyrosine phosphatase receptor type O (PTPRO) has been recognized as a tumor suppressor in various types of cancer cells. However, little attention has been given to the role of PTPRO expression in the tumor microenvironment. We aimed to reveal the role of PTPRO in the breast cancer niche. Py8119 mouse breast cancer cells were implanted orthotopically into female wild-type or ptpro-/- C57Bl/6 mice. We observed that the loss of PTPRO in the tumor niche was correlated with larger tumor volume, more metastases, increased number of circulating tumor cells (CTCs), less apoptosis and reduced necrosis rates in the orthotopic mouse model of breast cancer. The tumor microenvironment in the ptpro-/- mice also showed increased microvessel density. Moreover, an intracardiac injection mouse model was used to determine the role of PTPRO in the pre-metastatic niche. Notably, more metastases were observed in the mice of the ptpro-/- group. Taken together, PTPRO expression in the tumor niche prevents tumor growth and the formation of metastases of breast cancer, in part by attenuating tumor-associated angiogenesis and inducing the apoptosis and necrosis of tumor cells.
authors: Department of Breast Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Zhao
authors: Z
authors: Liu
authors: Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Jiajie
authors: J
authors: Hou
authors: Department of Breast Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Lidong
authors: L
authors: Ren
authors: Department of Breast Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Jing
authors: J
authors: He
authors: Liver Transplantation Center, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Beicheng
authors: B
authors: Sun
authors: Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA.
authors: Lu-Zhe
authors: LZ
authors: Sun
authors: Department of Breast Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China.
authors: Shui
authors: S
authors: Wang
mesh_terms: D000818:Animals; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D008325:Mammary Neoplasms, Experimental / Q000098:blood supply / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D055806:Microvessels / Q000473:pathology; D009362:Neoplasm Metastasis; D009363:Neoplasm Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D009360:Neoplastic Cells, Circulating; D014411:Neoplastic Stem Cells; D009389:Neovascularization, Pathologic / Q000235:genetics / Q000378:metabolism; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3 / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D055153:Stem Cell Niche; D059016:Tumor Microenvironment
chemical_list: D009363:Neoplasm Proteins; C516890:Ptpro protein, mouse; D054631:Receptor-Like Protein Tyrosine Phosphatases, Class 3