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Programmed Cell Death Recruits Macrophages Into the Developing Mouse Cochlea.

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Macrophages are recruited to the developing cochlea after programmed cell death (PCD) begins. However, these immune cells are not essential for the regression of the greater epithelial ridge (GER) during cochlear remodeling.

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Area of Science:

  • Developmental Biology
  • Immunology
  • Otolaryngology

Background:

  • Programmed cell death (PCD) is crucial for cochlear development and maturation.
  • Thyroid hormone (T3) regulates PCD in the greater epithelial ridge (GER) of Kölliker's organ between postnatal days 5-15.
  • Macrophages are present in the developing cochlea, but their role in tissue remodeling is unknown.

Purpose of the Study:

  • To investigate the role of macrophages in the programmed cell death and regression of the GER during cochlear development.
  • To determine if macrophage recruitment is linked to developmental PCD in the GER.
  • To assess whether macrophages are essential for GER regression.

Main Methods:

  • Examined the temporal relationship between GER cell death and macrophage infiltration in mouse cochleae.
  • Utilized genetic models (CX3CR1 deficient mice) and pharmacological interventions (T3 injection, CSF1R antagonist BLZ945) to manipulate PCD and macrophage populations.
  • Depleted macrophages using CX3CR1DTR/+ mice and BLZ945 treatment.

Main Results:

  • Cell death in the basal GER begins at postnatal day 5, with enhanced macrophage numbers observed at postnatal day 7.
  • T3 injection at postnatal days 0-1 induced premature GER cell death and earlier macrophage recruitment.
  • Macrophage depletion did not alter the pattern or timing of GER regression.

Conclusions:

  • Macrophages are recruited to the GER region following the initiation of developmental PCD.
  • Macrophages are not essential for the regression of the GER during cochlear remodeling.
  • Developmental PCD in the cochlea precedes and influences macrophage recruitment, rather than the reverse.