PMID- 24106968 OWN - NLM STAT- MEDLINE DCOM- 20140605 LR - 20191027 IS - 1875-5550 (Electronic) IS - 1389-2037 (Linking) VI - 14 IP - 7 DP - 2013 Nov TI - Functional switch from pro-neurotrophins to mature neurotrophins. PG - 617-25 AB - Growing evidence has shown that the proforms of several neurotrophins, e.g., nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin3 (NT3) can be synthesized, secreted from neurons or glial cells and function actively in mammalian nervous system. By the intracellular and extracellular enzymatic cleavage processing, mature neurotrophins are generated and exert their functions in the developing, physiological and pathological activities. While mature neurotrophins exhibit neuroprotective roles via tyrosine kinase receptors (TrkA, TrkB and TrkC), the proforms of neurotrophins show totally-different biological effects that may induce apoptotic cell death of neurons by triggering p75NTR-sortilin signaling cascades. In addition, another key neurotrophic factor named glial-derived neurotrophic factor (GDNF) also appears to be a product generated from proGDNF, and its cleavage and potential biological function of proGDNF remains an unrevealed problem. Obviously, accumulating studies indicated that the exact or timely cleavage processing should be essential for the functional switch from proneurotrophins to mature neurotrophins, while dysfunction in the enzymatic cleavage, aberrant extracellular release, and abnormal subunit organization of binding receptors might be also crucially involved in neurodegeneration of the central neurons, pathogenesis, and even disease progression of various neurodegenerative diseases in human beings. FAU - Sun, Xiao-Long AU - Sun XL AD - Institute of Neurosciences, The Fourth Military Medical University, Xi'an, 710032, China. lwchen@fmmu.edu.cn. FAU - Chen, Bei-Yu AU - Chen BY FAU - Xia, Yi AU - Xia Y FAU - Wang, Jing-Jie AU - Wang JJ FAU - Chen, Liang-Wei AU - Chen LW LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - United Arab Emirates TA - Curr Protein Pept Sci JT - Current protein & peptide science JID - 100960529 RN - 0 (Nerve Growth Factors) RN - 0 (Protein Precursors) SB - IM MH - Animals MH - Disease MH - Humans MH - Nerve Growth Factors/*metabolism MH - Protein Precursors/metabolism MH - Signal Transduction EDAT- 2013/10/11 06:00 MHDA- 2014/06/06 06:00 CRDT- 2013/10/11 06:00 PHST- 2012/07/11 00:00 [received] PHST- 2013/08/16 00:00 [revised] PHST- 2013/08/16 00:00 [accepted] PHST- 2013/10/11 06:00 [entrez] PHST- 2013/10/11 06:00 [pubmed] PHST- 2014/06/06 06:00 [medline] AID - CPPS-EPUB-56588 [pii] AID - 10.2174/1389203711209070658 [doi] PST - ppublish SO - Curr Protein Pept Sci. 2013 Nov;14(7):617-25. doi: 10.2174/1389203711209070658.