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NT-4/5 antagonizes the BDNF modulation of corticostriatal transmission: Role of the TrkB.T1 receptor.
CNS Neuroscience & Therapeutics 2019 January 22
Neurotrophins are related to survival, growth, differentiation and neurotrophic maintenance as well as modulation of synaptic transmission in different regions of the nervous system. BDNF effects have been studied in the striatum due to the trophic role of BDNF in medium spiny neurons; however, less is known about the effects of NT-4/5, which is also present in the striatum and activates the TrkB receptor along with BDNF. If both neurotrophins are present in the striatum, the following question arises: What role do they play in striatal physiology? Thus, the aim of this study was to determine the physiological effect of the sequential application and coexistence of BDNF and NT-4/5 on the modulation of corticostriatal synapses. Our data demonstrated that neurotrophins exhibit differential effects depending on exposure order. BDNF did not modify NT-4/5 effect; however, NT-4/5 inhibited the effects of BDNF. Experiments carried out in COS-7 cells to understand the mechanisms of this antagonism, indicated that NT-4/5 exerts its inhibitory effect on BDNF by upregulating the TrkB.T1 and downregulating the TrkB-FL isoforms of the TrkB receptor.
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