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Increasing evidence suggests that three-dimensional (3D) cultures provide more appropriate microenvironments to control stem cell response compared with traditional two-dimensional (2D) cultures. However, the molecular mechanism involved in 3D cultured stem cells is not well known. Several microRNAs whose target genes involved in the regulation of self-renewal and differentiation of stem cells were found to be downregulated in 3D cultured PA-1 cells. Among them, miR-7 was predicted to target Kruppel-like factor 4 (Klf4), a key gene for self-renewal of neural stem cells (NSCs). We showed that the differentiation of NSCs was inhibited in 3D collagen scaffolds compared with 2D cultured cells. The quantitative real-time PCR (qPCR) analysis indicated that the expression of miR-7 and Klf4 changed significantly in 2D cultures, whereas the expression stability of miR-7 and Klf4 was detected in 3D cultures. Using luciferase assay and western blot, Klf4 was identified as a target of miR-7 indicating that miR-7 plays a critical role in maintaining the self-renewal capacity through a Klf4-dependent mechanism in 3D cultured cells. Thus, the collagen scaffold-based 3D cell cultures may provide a platform to reveal the regulatory mechanism of cell regulators, which are difficult to find in traditional 2D cell cultures.

The miR-7 Identified from Collagen Biomaterial-Based Three-Dimensional Cultured Cells Regulates Neural Stem Cell Differentiation