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Previous Article | Next Article
The Journal of Neuroscience, September 1, 1998, 18(17):6882-6891
Thrombin Perturbs Neurite Outgrowth and Induces Apoptotic Cell Death in Enriched Chick Spinal Motoneuron Cultures through Caspase Activation
Victoria L. Turgeon1, Elizabeth D. Lloyd1, Siwei Wang1, Barry W. Festoff2, and Lucien J. Houenou1 1 Department of Neurobiology and Anatomy, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, and 2 Neurobiology Research Laboratory, Veterans Administration Medical Center, Kansas City, Missouri 64128, and Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas 66170
Increasing evidence indicates several roles for thrombin-like serine proteases and their cognate inhibitors (serpins) in normal development and/or pathology of the nervous system. In addition to its prominent role in thrombosis and/or hemostasis, thrombin inhibits neurite outgrowth in neuroblastoma and primary neuronal cells in vitro, prevents stellation of glial cells, and induces cell death in glial and neuronal cell cultures. Thrombin is known to act via a cell surface protease-activated receptor (PAR-1), and recent evidence suggests that rodent neurons express PAR-1. Previously, we have shown that the thrombin inhibitor, protease nexin-1, significantly prevents neuronal cell death both in vitro and in vivo. Here we have examined the effects of human
-thrombin and the presence and/or activation of PAR-1 on the survival and differentiation of highly enriched cultures of embryonic chick spinal motoneurons. We show that thrombin significantly decreased the mean neurite length, prevented neurite branching, and induced motoneuron death by an apoptosis-like mechanism in a dose-dependent manner. These effects were prevented by cotreatment with hirudin, a specific thrombin inhibitor. Treatment of the cultures with a synthetic thrombin receptor-activating peptide (SFLLRNP) mimicked the deleterious effects of thrombin on motoneurons. Furthermore, cotreatment of the cultures with inhibitors of caspase activities completely prevented the death of motoneurons induced by either thrombin or SFLLRNP. These findings indicate that (1) embryonic avian spinal motoneurons express functional PAR-1 and (2) activation of this receptor induces neuronal cell degeneration and death via stimulation of caspases. Together with previous reports, our results suggest that thrombin, its receptor(s), and endogenous thrombin inhibitors may be important regulators of neuronal cell fate during development, after injury, and in pathology of the nervous system.
Key words: thrombin; serine proteases; PAR-1; apoptosis; caspases; spinal motoneuron cultures
Copyright © 1998 Society for Neuroscience 0270-6474/98/18176882-10$05.00/0
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