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Neuroinflammation causes mitral cell dysfunction and olfactory impairment in a multiple sclerosis model.

Charlotte Schubert1, Kristina Schulz2, Jana K Sonner1

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Olfactory dysfunction in multiple sclerosis (MS) involves damage to olfactory bulb neurons. This study in an MS animal model (EAE) found that neuroinflammation affects mitral cells, impacting smell by altering potassium channel activity.

Keywords:
Experimental autoimmune encephalomyelitisMitral cellsMonoatomic ion channel activityMultiple sclerosisNeuroinflammationOlfactory bulbPotassium channelsSingle-nucleus RNA sequencingTASK-2

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Area of Science:

  • Neuroscience
  • Immunology
  • Ophthalmology

Background:

  • Olfactory dysfunction is a common but underrecognized symptom in multiple sclerosis (MS).
  • The pathogenic mechanisms of inflammation-induced olfactory bulb dysfunction in MS remain unclear.
  • This study utilizes the experimental autoimmune encephalomyelitis (EAE) model, an animal model for MS, to investigate these mechanisms.

Purpose of the Study:

  • To investigate the pathogenic mechanisms of inflammation-induced olfactory bulb dysfunction in the EAE model of MS.
  • To identify specific neuronal populations and molecular pathways affected by neuroinflammation in the olfactory bulb.
  • To elucidate the role of mitral cells in olfactory dysfunction during EAE.

Main Methods:

  • Experimental autoimmune encephalomyelitis (EAE) induction in a relevant animal model.
  • Assessment of olfactory function in EAE animals.
  • Single-nucleus RNA sequencing of olfactory bulb cells to profile gene expression changes.
  • Functional validation of identified molecular targets, including potassium channel activity.

Main Results:

  • Reduced olfactory function in EAE was correlated with the degeneration of short-axon neurons, immature neurons, mitral cells, and tufted cells.
  • Neuroinflammation induced the expression of potassium channel transcripts in mitral cells.
  • Increased halothane-induced outward currents in mitral cells suggest altered ion channel activity contributing to olfactory impairment.

Conclusions:

  • Mitral cells play a critical role in the olfactory bulb during EAE, a model for MS.
  • Altered potassium channel activity in mitral cells is implicated in neuroinflammation-induced olfactory dysfunction.
  • This research enhances understanding of neuroinflammation-driven neurodegeneration in MS affecting olfactory pathways.