PTP[sigma] Is a Receptor for Chondroitin Sulfate Proteoglycan, an Inhibitor of Neural Regeneration

• Published in: Science (American Association for the Advancement of Science) Vol. 326; no. 5952; pp. 592 - 596
• Main Authors: Shen, Yingjie, Tenney, Alan P, Busch, Sarah A, Horn, Kevin P, Cuascut, Fernando X, Liu, Kai, He, Zhigang, Silver, Jerry, Flanagan, John G
• Format: Journal Article
• Language: English
• Published: Washington The American Association for the Advancement of Science 23.10.2009
• Subjects: Binding sites; Cell growth; Gene expression; Neurons; Proteins
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.1178310

Chondroitin sulfate proteoglycans (CSPGs) present a barrier to axon regeneration. However, no specific receptor for the inhibitory effect of CSPGs has been identified. We showed that a transmembrane protein tyrosine phosphatase, PTP, binds with high affinity to neural CSPGs. Binding involves the chondroitin sulfate chains and a specific site on the first immunoglobulin-like domain of PTP. In culture, PTP-/- neurons show reduced inhibition by CSPG. A PTP fusion protein probe can detect cognate ligands that are up-regulated specifically at neural lesion sites. After spinal cord injury, PTP gene disruption enhanced the ability of axons to penetrate regions containing CSPG. These results indicate that PTP can act as a receptor for CSPGs and may provide new therapeutic approaches to neural regeneration. [PUBLICATION ABSTRACT]