Effects of various culture conditions on pluripotent stem cell derivation from chick embryos

Area of Science:

• * Stem cell biology
• * Avian biotechnology
• * Developmental biology

Background:

• * Pluripotent stem cells (PSCs) from avian sources offer a promising platform for producing recombinant proteins and vaccines.
• * Establishing and maintaining avian PSC lines is challenging, with variable efficiency across chick strains.
• * Current methods often require serum-based media and feeder layers, limiting scalability and reproducibility.

Purpose of the Study:

• * To investigate the impact of various culture media components on the derivation and maintenance of avian PSCs.
• * To identify optimal conditions for efficient derivation of pluripotent stem cells from chick embryos.
• * To evaluate serum-free media formulations, feeder layers, growth factors, and small molecules.

Main Methods:

• * Culturing avian embryonic stem cells (ESCs) and embryonic germ cells (EGCs) from different developmental stages (X and HH28).
• * Testing diverse media compositions, including serum-based and serum-free formulations (e.g., N2B27).
• * Supplementing media with specific small molecules (PD0325901, SB431542 - MEK and TGFβ inhibitors, termed R2i) and cytokines (leukemia inhibitory factor - LIF).

Main Results:

• * The combination of N2B27 serum-free medium with R2i (PD0325901 and SB431542) and LIF significantly enhanced PSC derivation efficiency from both stage X and HH28 embryos.
• * Defined culture conditions, specifically N2B27/R2i + LIF medium, proved effective for deriving chick PSCs.
• * Serum-free defined media support efficient derivation and maintenance of avian PSCs.

Conclusions:

• * A defined serum-free medium (N2B27/R2i + LIF) is highly effective for deriving avian pluripotent stem cells.
• * This optimized protocol facilitates the use of chick PSCs in biotechnology applications.
• * The findings contribute to the biobanking of valuable avian species through improved stem cell technologies.