Tailored Xenogeneic-Free Polymer Surface Promotes Dynamic Migration of Intestinal Stem Cells.

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Regenerative Medicine

Background:

• Intestinal stem cells (ISCs) are crucial for epithelial regeneration but require defined, scalable culture platforms.
• Existing culture systems often use Matrigel, hindering clinical translation and mechanistic studies.
• There is a need for xenogeneic-free, robust culture surfaces for ISC expansion and application.

Purpose of the Study:

• To develop a synthetic, xenogeneic-free culture surface that supports intestinal stem cell (ISC) attachment, expansion, and function.
• To investigate the impact of surface modification on ISC behavior and cytoskeletal dynamics.
• To evaluate the potential of the developed platform for regenerative medicine applications, including wound closure.

Main Methods:

• Fabrication of a poly(ethyleneglycoldimethacrylate) (pEGDMA) surface.
• Surface modification using N2 plasma treatment to create the PoLymer-coated Ultra-stable Surface (PLUS).
• Assessment of ISC attachment, culture stability, gene expression, proteomics, cell migration, and wound closure assays.

Main Results:

• The PLUS surface demonstrated improved ISC attachment and maintained ISC-supportive function for over 3 years.
• Gene expression and proteomic analyses revealed upregulation of factors related to actin dynamics and cytoskeletal reorganization.
• ISCs cultured on PLUS exhibited enhanced migration speed (1.8-fold increase) and significant wound closure (46.7% in 144 hours).

Conclusions:

• The PLUS surface is a scalable, xenogeneic-free platform that promotes ISC attachment and migration by modulating cytoskeletal dynamics.
• This synthetic surface facilitates ISC-substrate interactions, supporting actin-dependent reorganization and migration.
• The PLUS platform holds significant potential for advancing ISC-based regenerative medicine and epithelial restoration therapies.