Biological Activity
IGFBP5 (insulin-like growth factor-binding protein 5) works via IGF (insulin like growth factor)-dependent and -independent mechanisms. It can function as a tumor suppressor as well as an oncogene. Changes in the activity of this gene are often observed in human cancers and metastatic tissues. During cancer development, IGFBP5 is involved in cell growth, migration and invasion. IGFBP5 is associated with breast cancer, osteosarcoma, head and neck squamous cell carcinoma, neuroblastoma, prostate cancer and malignant melanoma. It is upregulated in systemic sclerosis and idiopathic pulmonary fibrosis. In primary fibroblasts, IGFBP5 exhibits pro-fibrotic effects. It is strongly expressed in bones and is involved in osteogenic differentiation. Under in vitro conditions, IGFBP5 and its microRNA (microRNA-143-3p) are involved in muscle regeneration.
