Neuronal excitability and spontaneous synaptic transmission in the entorhinal cortex of BDNF heterozygous mice

Abidin İ., Aydin-Abidin S., MITTMANN T.

NEUROSCIENCE LETTERS, cilt.690, ss.69-75, 2019 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 690
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.neulet.2018.10.019
  • Dergi Adı: NEUROSCIENCE LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.69-75
  • Anahtar Kelimeler: Entorhinal Cortex, BDNF, Synaptic transmission, Firing properties, BDNF heterozygous mice, LONG-TERM POTENTIATION, NEUROTROPHIC FACTOR, FIRING PATTERNS, GANGLION-CELLS, VISUAL-CORTEX, LIMBIC SYSTEM, SYNCHRONIZATION, INHIBITION, EXPRESSION, MATURATION
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

Brain Derived Neurotropic Factor (BDNF) is a neutrophic factor that is required for the normal neuronal development and function. BDNF is involved in regulation of synapses as well as neuronal excitability. Entorhinal Cortex (EC) is a key brain area involved in many physiological and pathological processes. In this study we investigated the effects of chronically reduced BDNF levels on layer 3 pyramidal neurons of EC. We aimed to assess the effects of reduced levels of BDNF on firing properties, spontaneous synaptic currents and excitation/inhibition balance from acute brain slices. Patch clamp recordings were obtained from pyramidal neurons of Entorhinal Cortex Layer 3. Findings of BDNF heterozygous (BDNF (+ / -) mice compared to their wild-type littermates at the age of 23-28 days. Action potential threshold was shifted (p = 0,002) to depolarized potentials and spike frequency was smaller in response to somatic current injection steps in BDNF (+ / -) mice. Spontaneous synaptic currents were also affected. sEPSC amplitude (p = 0,009), sIPSC frequency (p = 0,001) and sIPSC amplitudes (p = 0,023) were reduced in BDNF (+ / -). Decay times of sIPSCs were longer in BDNF (+ / -) (p = 0,014). Calculated balance of excitatory/inhibitory balance was shifted in the favor of excitation in BDNF (+ / -) mice (p = 0,01). These findings suggest that reductions in concentrations of BDNF results in altered status of excitability and excitation/inhibition imbalance. However, these differences observed in BDNF (+/ -) seem to have opposing effects on neuronal activity.