TACE/ADAM17 is essential for oligodendrocyte development and CNS myelination

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• A disintegrin and metalloproteinase (ADAM) proteins are implicated in peripheral nervous system (PNS) myelination.
• The role of ADAMs in oligodendrocyte development and central nervous system (CNS) myelination remains largely unexplored.

Purpose of the Study:

• To investigate the function of ADAM17, also known as tumor necrosis factor-α converting enzyme (TACE), in oligodendrocyte development and CNS myelination.
• To elucidate the molecular mechanisms by which TACE regulates oligodendrogenesis and myelination.

Main Methods:

• Genetic deletion of TACE in oligodendrocyte progenitor cells (OPs) in mice.
• Analysis of oligodendrocyte development, survival, and myelination in the subcortical white matter (SCWM).
• Assessment of motor behavior in TACE-deficient mice and comparison with EGFR hypofunctional models.

Main Results:

• TACE deletion in OPs led to premature cell cycle exit and reduced OL survival during postnatal myelination.
• Deficits in SCWM myelination and motor behavior were observed in TACE-deficient mice.
• TACE regulates oligodendrogenesis by modulating shedding of EGFR ligands (TGFα and HB-EGF), impacting EGFR signaling.
• EGFR overexpression rescued OL survival and development in TACE-deficient OPs.

Conclusions:

• TACE is a novel key modulator of oligodendrocyte development and CNS myelination.
• TACE regulates CNS myelination through modulation of EGFR signaling pathways.
• Targeting TACE may offer therapeutic potential for CNS demyelinating diseases.