Immortalized keratinocyte lines derived from human embryonic stem cells.

Area of Science:

• Stem Cell Biology
• Epithelial Biology
• Cellular Differentiation

Background:

• Human embryonic stem (hES) cells offer a potential source for regenerative medicine.
• Keratinocytes are crucial for stratified squamous epithelia and skin barrier function.
• Understanding hES cell differentiation into specific lineages is vital for therapeutic development.

Purpose of the Study:

• To investigate the differentiation potential of hES cells into keratinocytes.
• To characterize the properties and limitations of hES-derived keratinocytes.
• To explore methods for expanding and immortalizing hES-derived keratinocytes for potential use.

Main Methods:

• Culturing H9 hES cells as embryoid bodies and in scid mouse xenografts.
• Assessing keratinocyte marker expression and proliferative capacity in vitro.
• Transducing hES-derived keratinocytes with hTERT and HPV16 E6E7 genes.
• Evaluating clonal expansion and differentiation potential of immortalized cell lines.

Main Results:

• H9 hES cells differentiated into keratinocytes expressing stratified squamous epithelial markers.
• hES-derived keratinocytes exhibited significantly lower proliferative potential compared to postnatal keratinocytes.
• Transduction with HPV16 E6E7 genes, but not hTERT, immortalized hES-derived keratinocytes.
• Immortalized keratinocyte lines maintained lineage markers but showed reduced terminal differentiation frequency.

Conclusions:

• hES cells can generate keratinocytes with distinct properties from postnatal counterparts.
• hES-derived keratinocytes require immortalization for clonal isolation and expansion.
• These findings have implications for the therapeutic application of hES-cell-derived somatic cells.