Analysis Note
The activity is measured in culture by the ability to enhance neurite outgrowth of cerebral cortical neurons from chick embryos.
Biochem/physiol Actions
Pleiotrophin may be the first member of a family of developmentally regulated cytokines. It is active in growth and development and the pleiotrophin gene is highly expressed in brain, uterus, gut, muscle, lung, and skin. Pleiotrophin mRNA is expressed in osteoblasts, chondrocytes, fibroblasts, astrocytes, Schwann cells, and tumor cells. Pleiotrophin is mitogenic and displays neurite outgrowth activity. It stimulates tumor angiogenesis. Pleiotrophin is also known as heparin-binding brain mitogen (HBBM), heparin-binding growth factor-8 (HBGF-8), heparin-binding growth-associated molecule (HB-GAM) and osteoblast-specific factor (OSF-1). There is extraordinary conservation between the amino acid sequences of bovine, human, and rat pleiotrophin.
Physical form
Lyophilized from a 0.2 μm filtered solution in phosphate buffered saline.