Abstract
Midkine (MK) is a heparin-binding growth factor that promotes cell migration, cell growth and cell survival. The promotion of migration of inflammatory cells, especially macrophages, by MK is involved in formation of a vascular abnormality, i.e. neointima formation. MK-induced migration of peritoneal exudate macrophages was inhibited by heparin, chondroitin sulfate E and dermatan sulfate, but not by chondroitin sulfate D or chondroitin 6-sulfate. Digestion of macrophages with chondroitinase ABC as well as chondroitinase B decreased the migratory activity. However, heparitinase digestion showed only slight effects. These results indicated that a chondroitin sulfate, i.e. an E-type oversulfated structure with dermatan sulfate domain, is involved in MK-induced migration of macrophages. Although a chondroitin sulfate proteoglycan, receptor-type protein tyrosine phosphatase zeta (PTP zeta), participates in MK-induced migration of neurons and osteoblasts, PTP zeta was not detected in macrophages. The MK-induced migration was inhibited by PP1, wortomanin, PD 98059 and vanadate, indicating that the downstream signaling system, which includes Src, PI3 kinase and ERK as important components, is shared with other MK signaling systems in w...Continue Reading
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