Secreted protein that functions as cytokine and growth factor and mediates its signal through cell-surface proteoglycan and non-proteoglycan receptors. Binds cell-surface proteoglycan receptors via their chondroitin sulfate (CS) groups. Thereby regulates many processes like inflammatory response, cell proliferation, cell adhesion, cell growth, cell survival, tissue regeneration, cell differentiation and cell migration (By similarity). Inhibits mesoderm formation and promotes neural formation during development. Plays a role in development of the neuromuscular junction (NMJ). Has antibacterial activity against both Gram-positive and Gram-negative bacteria (By similarity). Belongs to the pleiotrophin family.