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Area of Science:

  • Neuroscience
  • Immunology
  • Ophthalmology

Background:

  • The miR-183/96/182 cluster (miR-183C) is crucial for sensory neuron and myeloid cell function.
  • Understanding neuro-immune interactions in the cornea is vital for treating microbial keratitis.

Purpose of the Study:

  • To investigate the role of miR-183C in sensory neurons during Pseudomonas aeruginosa (PA) keratitis.
  • To elucidate the interplay between corneal sensory nerves (CSN) and myeloid cells (MC) under infection.

Main Methods:

  • Utilized a double-tracing mouse model with sensory neuron-specific conditional knockout of miR-183C (CKO).
  • Labeled CSN with RFP and MC with EGFP for confocal microscopy.
  • Infected corneas with PA and analyzed nerve and immune cell dynamics at various time points post-infection.

Main Results:

  • CSN degeneration occurred rapidly in wild-type mice post-PA infection.
  • CKO mice showed slightly slower CSN degeneration but altered MC distribution and reduced infiltration.
  • PA keratitis severity was decreased in CKO mice, indicated by reduced neutrophils and MPO levels.

Conclusions:

  • The double-tracing model effectively visualizes CSN-MC interplay during PA keratitis.
  • miR-183C in CSN significantly modulates CSN density and MC dynamics, highlighting a key neuro-immune interaction.
  • CSN-derived miR-183C plays a protective role by regulating innate immune responses within 24 hours of infection.