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JOURNAL ARTICLE
REVIEW
PROneurotrophins and CONSequences.
Molecular Neurobiology 2018 April
Proneurotrophins were initially thought to be simple inactive precursors, only responsible for promoting the folding of the mature domain and for the regulation of the neurotrophin secretory pathway. However, recent evidence shows that proneurotrophins can be secreted to the extracellular space, bind with high affinity to specific receptor complexes and induce activation of the apoptotic machinery with subsequent cell death of different neuronal populations. These pathways can be activated due to injury and to several neurodegenerative disorders, which promote proneurotrophin secretion to the extracellular space. In addition to neuropathology, extracellular proneurotrophins also play a pivotal role in many other cellular mechanisms in the nervous system. Proneurotrophins were shown to mediate synaptic plasticity, namely long-term depression in hippocampal neurons. They are also important in axonal development, and an increase of pro- to mature neurotrophin ratio has been described as a trigger of cell death. The conversion of proneurotrophins into the respective mature form is controlled by the action of several enzymes and regulators. The failure in this regulation is now considered one of the possible mechanisms responsible for pathological cell death associated to proneurotrophins. Here, we discuss the processes behind proneurotrophin action, with particular focus on proBDNF and proNGF and their regulatory pathways. Additionally, we review the most recent studies concerning proneurotrophin involvement in neuronal death, in several disease-associated states in the CNS and PNS, and discuss future avenues of investigation in the proneurotrophin field.
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