NG2 glial cells regulate neuroimmunological responses to maintain neuronal function and survival

Area of Science:

• Neuroscience
• Cell Biology
• Immunology

Background:

• NG2-expressing glial cells (NG2 glial cells) are neural progenitor cells active in the adult mammalian central nervous system (CNS).
• While known for producing oligodendrocytes and astrocytes, their non-proliferative roles and interactions with neurons in the adult CNS are not fully understood.

Purpose of the Study:

• To investigate the non-proliferative functions of NG2 glial cells in the adult CNS.
• To elucidate the mechanisms by which NG2 glial cells influence neuronal health and CNS homeostasis.

Main Methods:

• Generation of NG2-HSVtk transgenic rats for selective ablation of NG2 glial cells in the adult CNS.
• Analysis of hippocampal neuron defects, neuroinflammation, and associated molecular pathways following NG2 glial cell ablation.

Main Results:

• Selective ablation of NG2 glial cells led to defects in hippocampal neurons.
• This was associated with excessive neuroinflammation, specifically via activation of the interleukin-1 beta (IL-1β) pathway.
• Loss of NG2 glial cell-derived hepatocyte growth factor (HGF) exacerbated these neuronal abnormalities and hippocampal atrophy.

Conclusions:

• NG2 glial cells play a critical role in maintaining neuronal function and survival in the adult CNS.
• These cells regulate neuroimmunological functions, preventing excessive neuroinflammation.
• The findings underscore the importance of NG2 glial cells beyond their progenitor role in CNS health.