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NKCC1 in Neonatal Cochlear Support Cells Reloads Ions Necessary for Cochlear Spontaneous Activity.

Kwon-Woo Kang1, Kushal Sharma1, Shi-Hyun Park1

  • 1College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Muan 58554, Korea.

Experimental Neurobiology
|May 9, 2024
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Summary

Na+-K+-Cl- cotransporter 1 (NKCC1) is crucial for spontaneous activity in inner supporting cells (ISCs) of the cochlea, influencing auditory development. Its inhibition reduces key activity markers in ISCs.

Keywords:
CochleaInner supporting cellKCC4NKCC1Spontaneous activity

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Area of Science:

  • Auditory Neuroscience
  • Cell Physiology
  • Developmental Biology

Background:

  • Spontaneous activity in cochlear inner hair cells (IHCs) is initiated by ATP release from inner supporting cells (ISCs).
  • ISC volume regulation involves ion transport mechanisms, including potential roles for Na+-K+-Cl- cotransporters (NKCCs) and K+-Cl- cotransporters (KCCs).

Purpose of the Study:

  • To investigate the involvement of NKCCs and KCCs in the spontaneous activity of ISCs.
  • To elucidate the specific role of NKCC1 in cochlear development and auditory function.

Main Methods:

  • Immunohistochemistry to detect NKCC1 expression patterns during development.
  • Pharmacological inhibition of NKCC using bumetanide.
  • RNA interference (shRNA) to reduce NKCC1 expression in cultured cochlear tissues.
  • Measurement of spontaneous extracellular potentials (sEPs) and spontaneous optical changes (sOCs).

Main Results:

  • NKCC1 is robustly expressed in ISCs until the second postnatal week, with a developmental shift to efferent terminals by postnatal day 18.
  • Bumetanide treatment significantly decreased the frequency of sEPs and sOCs in ISCs.
  • NKCC1-shRNA significantly reduced the frequency and area of spontaneous events in cultured cochlear tissues.

Conclusions:

  • NKCC1 plays a pivotal role in shaping ISC spontaneous activity.
  • This activity is critical for the development of the auditory pathway.
  • NKCC1 may also be involved in modulating synaptic transmission post-hearing development.