Sertoli cell-conditioned medium induces germ cell differentiation in human embryonic stem cells

Area of Science:

• Stem cell biology
• Reproductive biology
• Developmental biology

Background:

• Human embryonic stem cells (hESCs) hold potential for regenerative medicine.
• Efficiently inducing germ cell differentiation from hESCs is crucial for understanding early development and treating infertility.

Purpose of the Study:

• To assess the spontaneous germ cell differentiation capacity of VUB hESC lines.
• To develop a protocol for germ cell differentiation induction using Sertoli cell conditioned medium (SCCM).
• To compare SCCM-based protocols with existing methods.

Main Methods:

• VUB hESC lines were cultured spontaneously or with bone morphogenetic proteins (BMPs) and/or SCCM.
• Germ cell differentiation was assessed by measuring VASA transcripts using real-time RT-PCR.
• Embryoid body and monolayer culture systems were compared.

Main Results:

• VUB hESC lines demonstrated spontaneous differentiation towards the germ cell lineage, particularly in embryoid body cultures.
• Both BMPs and SCCM significantly enhanced VASA expression, indicating improved germ cell differentiation.
• No synergistic effect was observed between BMPs and SCCM; direct contact with Sertoli cells did not further improve differentiation.

Conclusions:

• SCCM contains factors that induce germ cell differentiation in hESCs.
• SCCM offers a promising component for developing robust in-vitro germ cell differentiation protocols.