Identification of ALPPL2 as a Naive Pluripotent State-Specific Surface Protein Essential for Human Naive Pluripotency...

Area of Science:

• Stem cell biology
• Developmental biology
• Molecular genetics

Background:

• Human naive pluripotent stem cells (hPSCs) are crucial for studying pluripotency and differentiation.
• Optimized culture conditions and molecular criteria for naive pluripotency have advanced the field.
• However, naive-specific surface markers and regulatory mechanisms remain incompletely understood.

Purpose of the Study:

• To identify novel naive-specific surface markers in human pluripotent stem cells.
• To elucidate the molecular mechanisms regulating naive pluripotency.
• To provide a functional tool for studying human naive pluripotency.

Main Methods:

• Proteomic and transcriptomic analyses were employed to identify surface markers.
• Functional studies were conducted to assess the role of identified markers in pluripotency.
• Investigated molecular interactions using techniques like RNA immunoprecipitation (RIP) assays.

Main Results:

• Alkaline phosphatase placental-like 2 (ALPPL2) was identified as a prominent naive-specific surface marker.
• ALPPL2 was found to be essential for both the establishment and maintenance of naive pluripotency.
• ALPPL2 interacts with IGF2BP1 to stabilize key pluripotency transcription factor mRNAs (TFCP2L1, STAT3).

Conclusions:

• ALPPL2 is a functional surface marker for human naive pluripotency.
• The ALPPL2-IGF2BP1 axis plays a critical role in regulating naive pluripotency.
• This study provides a valuable tool for mechanistic investigations in human naive pluripotency.