[Knockout serum replacement improves establishment efficiency of C57BL/6J mouse embryonic stem cell line]

Area of Science:

• Stem cell biology
• Developmental biology
• Genetics

Context:

• Embryonic stem cells (ESCs) are crucial for developmental biology research and regenerative medicine.
• Traditional ESC culture often relies on serum, which introduces variability and necessitates screening.
• Establishing robust ESC lines from specific mouse strains, like C57BL/6J, is essential for genetic studies.

Purpose:

• To evaluate the efficacy of Knockout Serum Replacement (KSR) in establishing a C57BL/6J mouse embryonic stem cell (ESC) line.
• To eliminate the variability and labor associated with fetal bovine serum (FBS) in ESC culture.
• To determine if KSR can support the self-renewal and pluripotency of mouse ESCs.

Summary:

• C57BL/6J mouse blastocysts were cultured using KSR, leading to the successful establishment of a pluripotent ESC line (MES-1) after 20 passages.
• The established MES-1 line exhibited characteristic ESC morphology, high expression of alkaline phosphatase and Oct-4, a normal XX karyotype, and demonstrated pluripotency through embryoid body formation, teratoma development, and chimera contribution.
• Control cultures using FBS failed to establish ESC lines beyond 3 passages, highlighting KSR's superior performance.

Impact:

• KSR provides a defined, efficient, and reproducible method for isolating and culturing C57BL/6J mouse ESCs.
• This approach simplifies the process by removing the need for FBS screening, accelerating research.
• The established KSR-based protocol facilitates the generation of genetically defined mouse ESC lines for various research applications.