The Combined Thermoresponsive Cell-Imprinted Substrate, Induced Differentiation, and "KLC Sheet" Formation

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Tissue Engineering

Background:

• Stem cells possess restorative potential through differentiation into functional cell types.
• Cell-imprinted topographies offer tunable templates for stem cell differentiation and bioactivity.
• Cell sheet technology, utilizing thermo-responsive polymers, facilitates gentle detachment of cell sheets with minimal extracellular matrix damage.

Purpose of the Study:

• To investigate the potential of combined cell imprinting and sheet technology to induce keratinocyte-like differentiation of mesenchymal stem cells (MSCs).

Main Methods:

• Development of a poly(dimethylsiloxane) (PDMS) substrate with keratinocyte cell-imprinted topography, grafted with poly(N-isopropylacrylamide) (PNIPAAm).
• Culture of adipose tissue-derived MSCs (AT-MSCs) on the fabricated PDMS substrate for 14 days.
• Monitoring of keratinocyte-like differentiation through the expression of specific markers (involucrin, P63, cytokeratin 14).

Main Results:

• Successful fabrication of PDMS molds with keratinocyte cell-imprinted topography.
• AT-MSCs cultured on the substrate exhibited keratinocyte morphology and significantly upregulated keratinocyte markers (cytokeratin-14, Involucrin, P63) compared to plastic culture (P < 0.05).
• Generation of keratinocyte-like cell (KLC) sheets upon minor environmental temperature changes.

Conclusions:

• Keratinocyte cell-imprinted substrates can effectively guide AT-MSCs towards KLCs by providing a specific niche and topographical cues.
• The combined approach of cell imprinting and cell sheet technology shows promise for directed stem cell differentiation.