Amniotic fluid stem cells (AFSCs) represent a promising class of multipotent stem cells with unique regenerative potential. These cells exhibit intermediate characteristics between embryonic and adult mesenchymal stem cells, enabling differentiation into diverse lineages such as myoblasts, osteoblasts, and chondrocytes without tumorigenic risk when transplanted in vivo. Isolated from amniotic fluid during mid- to full-term pregnancy in both humans and rodents, AFSCs demonstrate robust clonogenicity with a 36-hour doubling time and can be cultured for up to 300 passages while maintaining pluripotency across ectodermal, mesodermal, and endodermal germ layers. Their therapeutic efficacy in neoorgan and tissue regeneration—particularly in cardiac, muscular, and renal repair—is largely attributed to paracrine signaling, where secreted growth factors and cytokines stimulate cell proliferation, cytoprotection, and migration.
Despite extensive research on cell-scaffold interactions, the influence of scaffold topography and material properties on the secretion of biologically active molecules from stem cells remains underexplored. This study investigates how cellulose acetate (CA), when blended with gelatin (Ge), affects the electrospinnability of gelatin and modulates the release of bioactive compounds from AFSCs. The resulting gelatin-cellulose acetate (Ge-CA) scaffolds were designed to mimic the natural extracellular matrix (ECM) niche, offering tailored microenvironments that influence stem cell behavior through physical cues.
Electrospun Ge-CA nanofibers were fabricated using varying weight ratios: 75:25, 50:50, and 25:75. Field emission scanning electron microscopy (FESEM) revealed that increasing CA content reduced fiber diameter—from 115.22 ± 36.44 nm in Ge-CA 75:25 to 66.58 ± 21.99 nm in Ge-CA 25:75—due to disrupted intermolecular hydrogen bonding and reduced solution viscosity. The scaffolds exhibited high porosity (>79%) and surface area ranging from 0.27 to 12.16 m²/g, facilitating efficient nutrient and gas exchange essential for cell viability and metabolic activity.LAMB2 Antibody Autophagy
Mechanical testing demonstrated that higher CA content enhanced tensile strength (from 30.Shh Antibody In Vitro 8 ± 0.7 MPa to 32.3 ± 1.8 MPa) and elongation at break (up to 42.5%), attributed to crosslinking via aldehyde-hydroxyl and amine interactions. After seeding, wet scaffolds showed reduced mechanical integrity, likely due to hydration-induced weakening of polymer chains, particularly evident in Ge-CA 25:75.
AFSCs seeded on these scaffolds displayed enhanced spreading and viability, especially on Ge-CA 75:25, which provided optimal RGD sequence availability for integrin-mediated adhesion. In contrast, dense, ultrafine fibers in Ge-CA 25:75 hindered nutrient diffusion, limiting proliferation. Embryoid body formation confirmed maintained stemness and pluripotency across all substrates.
The most significant finding emerged from wound scratch assays using injured human dermal fibroblasts (HDFs).PMID:34896328 Culture media collected from AFSCs grown on Ge-CA 75:25 scaffolds induced the most rapid HDF migration, achieving 78% wound closure within 48 hours—significantly outperforming controls. This acceleration correlated with elevated levels of paracrine factors, including growth factors and immunomodulatory cytokines, released by AFSCs in response to favorable scaffold topography and mechanical cues.
This study demonstrates that scaffold architecture—specifically fiber diameter, porosity, and mechanical properties—plays a pivotal role in regulating the secretion of biologically active molecules from AFSCs. By creating a biomimetic, cell-friendly microenvironment, Ge-CA scaffolds enhance paracrine function, accelerating tissue repair processes. Furthermore, the scratch assay proved to be a reliable, cost-effective method for quantifying cell migration in response to stem cell-secreted factors.
These findings establish a new paradigm in scaffold-stem cell interaction, highlighting the importance of material design in harnessing the regenerative power of AFSCs. Future work will focus on identifying specific paracrine mediators and optimizing scaffold parameters for clinical translation in regenerative medicine.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
