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Cleavage of proBDNF by tPA/Plasmin Is Essential for Long-Term Hippocampal Plasticity
Petti T. Pang,1,3Henry K. Teng,2Eugene Zaitsev,1Newton T. Woo,1Kazuko Sakata,1Shushuang Zhen,2Kenneth K. Teng,2Wing-Ho Yung,3Barbara L. Hempstead,2Bai Lu1*
Long-term memory is thought to be mediated by protein synthesisdependent,late-phase long-term potentiation (L-LTP). Two secretory proteins,tissue plasminogen activator (tPA) and brain-derived neurotrophicfactor (BDNF), have been implicated in this process, but theirrelationship is unclear. Here we report that tPA, by activatingthe extracellular protease plasmin, converts the precursor proBDNFto the mature BDNF (mBDNF), and that such conversion is criticalfor L-LTP expression in mouse hippocampus. Moreover, applicationof mBDNF is sufficient to rescue L-LTP when protein synthesisis inhibited, which suggests that mBDNF is a key protein synthesisproduct for L-LTP expression.
1 Section on Neural Development and Plasticity, Laboratory of Cellular and Synaptic Neurophysiology, National Institute of Child Health and Human Development (NICHD), Bethesda, MD 20892, USA. 2 Division of Hematology, Department of Medicine, Weill Medical College of Cornell University, New York, NY 10021, USA. 3 Department of Physiology, Faculty of Medicine, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
* To whom correspondence should be addressed. E-mail: bailu{at}mail.nih.gov
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