Loss of Brain-Derived Neurotrophic Factor Mediates Inhibition of Hippocampal Long-Term Potentiation by High-Intensity Sound

Autor(es)

de Deus, Junia L. ^{[1, 2]} ; Amorim, Mateus R. ^[2] ; Ribeiro, Aline B. ^[1] ; Barcellos-Filho, Procopio C. G. ^[1] ; Ceballos, Cesar C. ^[1] ; Branco, Luiz Guilherme S. ^[1] ; Cunha, Alexandra O. S. ^[2] ; Leao, Ricardo M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Physiol, BR-14049900 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Dent Sch Ribeirao Preto, Dept Basic & Oral Biol, BR-14040904 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Cellular and Molecular Neurobiology; v. 41, n. 4 MAY 2020.
• Citações Web of Science: 0

Resumo

Exposure to noise produces cognitive and emotional disorders, and recent studies have shown that auditory stimulation or deprivation affects hippocampal function. Previously, we showed that exposure to high-intensity sound (110 dB, 1 min) strongly inhibits Schaffer-CA1 long-term potentiation (LTP). Here we investigated possible mechanisms involved in this effect. We found that exposure to 110 dB sound activates c-fos expression in hippocampal CA1 and CA3 neurons. Although sound stimulation did not affect glutamatergic or GABAergic neurotransmission in CA1, it did depress the level of brain-derived neurotrophic factor (BDNF), which is involved in promoting hippocampal synaptic plasticity. Moreover, perfusion of slices with BDNF rescued LTP in animals exposed to sound stimulation, whereas BDNF did not affect LTP in sham-stimulated rats. Furthermore, LM22A4, a TrkB receptor agonist, also rescued LTP from sound-stimulated animals. Our results indicate that depression of hippocampal BDNF mediates the inhibition of LTP produced by high-intensity sound stimulation. (AU)

• Processo FAPESP: 16/17681-9 - Alterações fisiopatológicas durante a inflamação sistêmica
• Beneficiário: Luiz Guilherme de Siqueira Branco
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/22327-7 - Estudo das propriedades eletrofisiológicas e morfofuncionais de neurônios do núcleo central do colículo inferior envolvidas com a gênese e propagação das crises audiogênicas
• Beneficiário: Alexandra Olimpio Siqueira Cunha
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 16/01607-4 - Estimulação auditiva de alta intensidade e plasticidade sináptica
• Beneficiário: Ricardo Mauricio Xavier Leão
• Modalidade de apoio: Auxílio à Pesquisa - Regular