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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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Related Experiment Video

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Direct Visualization of the Murine Dorsal Cochlear Nucleus for Optogenetic Stimulation of the Auditory Pathway
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Synaptic Reorganization Response in the Cochlear Nucleus Following Intense Noise Exposure.

S Manohar1, P V Ramchander1, R Salvi1

  • 1University at Buffalo, Center for Hearing and Deafness, 3435 Main Street, Cary 137, Buffalo, NY 14214, United States.

Neuroscience
|December 30, 2018
PubMed
Summary
This summary is machine-generated.

Noise-induced hearing loss triggers neuroplasticity in the cochlear nucleus. Key genes like Bdnf, Homer-1, and Grin1 are vital for synaptic repair and maintaining auditory function after auditory nerve damage.

Keywords:
dorsal cochlear nucleusgene expressionnoise-induced hearing losssynaptic plasticityventral cochlear nucleus

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Molecular Biology

Background:

  • The cochlear nucleus (CN) in the brainstem processes auditory information from the auditory nerve.
  • Noise-induced damage to the auditory nerve causes neuroplastic changes in the CN, altering synaptic structure and function.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying synaptic reorganization in the CN after noise exposure.
  • To identify key genes involved in neurogenesis and synaptic plasticity in response to auditory nerve degeneration.

Main Methods:

  • Rats were unilaterally exposed to high-intensity noise, causing hearing loss.
  • Gene expression profiling of the dorsal cochlear nucleus (DCN) and ventral cochlear nucleus (VCN) was performed using a PCR gene array at 2 and 28 days post-exposure.
  • In situ hybridization was used to validate changes in specific gene expression (Bdnf, Homer-1, Grin1).

Main Results:

  • Significant differential gene expression was observed, particularly for genes related to synaptogenesis and regeneration.
  • The ventral cochlear nucleus (VCN) showed more gene expression changes than the dorsal cochlear nucleus (DCN).
  • More pronounced changes were detected at 28 days compared to 2 days post-exposure, indicating a time-dependent response.

Conclusions:

  • Brain-derived neurotrophic factor (Bdnf), Homer-1, and the glutamate NMDA receptor Grin1 are implicated in synaptic remodeling within the cochlear nucleus following noise-induced afferent degeneration.
  • These genes play crucial roles in maintaining synaptic homeostasis and facilitating repair processes in the auditory pathway.