YAP and TAZ differentially regulate postnatal cortical progenitor proliferation and astrocyte differentiation

Area of Science:

• Neuroscience
• Stem Cell Biology
• Molecular Biology

Background:

• Yes-associated protein (YAP) and WW domain-containing transcription regulator 1 (TAZ) are key transcriptional co-activators in the Hippo pathway.
• These proteins are crucial for stem cell proliferation and differentiation, but can have divergent cellular effects.
• Their specific roles in neural stem and progenitor cell (NPC) differentiation are not fully elucidated.

Purpose of the Study:

• To investigate the distinct functions of TAZ and YAP in mouse neural stem and progenitor cell differentiation.
• To determine how TAZ and YAP mediate signaling from bone morphogenetic protein (BMP) and β1-integrin (ITGB1) pathways in astrocyte development.
• To elucidate the differential regulation of astrocytic progenitors by TAZ and YAP.

Main Methods:

• Utilized mouse neural stem and progenitor cells (NPCs).
• Investigated the roles of TAZ and YAP in response to BMP signaling.
• Examined the involvement of TAZ and YAP in β1-integrin and integrin-linked kinase signaling pathways.
• Assessed the impact of extracellular matrix cues on NPC fate.

Main Results:

• TAZ specifically regulates astrocytic differentiation and maturation.
• TAZ mediates some, but not all, BMP signaling effects on astrocytic development.
• Both TAZ and YAP mediate β1-integrin and integrin-linked kinase signaling effects on NPC fate, dependent on extracellular matrix cues.
• YAP regulates the cell cycle states of astrocytic progenitors, while TAZ governs their differentiation and maturation into astrocytes.

Conclusions:

• TAZ and YAP exhibit divergent functions in regulating astrocyte differentiation.
• YAP controls the cell cycle progression of astrocytic progenitors.
• TAZ promotes the terminal differentiation and maturation of astrocytes from progenitors.