Suspension-Induced Stem Cell Transition: A Non-Transgenic Method to Generate Adult Stem Cells from Mouse and Human...

Area of Science:

• Cell Biology
• Regenerative Medicine
• Stem Cell Biology

Background:

• Adult stem cells (ASCs) are challenging to culture in sufficient quantities from most tissues, often necessitating chemical or genetic modifications.
• Standard adherent culture methods for fibroblasts result in elongated cells, unlike the desired rounded morphology for stem cell applications.

Purpose of the Study:

• To develop a novel, high-yield method for generating adult stem cell-like cells from somatic cells.
• To characterize the properties and potential of cells generated through this new method.

Main Methods:

• Primary mouse fibroblasts and human somatic cells (fibroblasts, hepatocytes, keratinocytes) were cultured in suspension.
• Cells were analyzed for morphology, surface marker expression (e.g., Sca1), and differentiation potential.
• Single-cell RNA sequencing was performed on mouse fibroblasts to identify cell populations and gene expression profiles.

Main Results:

• Suspension culture induced a rapid transition (within 24 h) of fibroblasts into rounded cells expressing mesenchymal stem cell (MSC) markers.
• This suspension-induced stem cell transition (SIST) method generated high yields of spheroid cells expressing ASC surface markers, circumventing anoikis.
• Mouse fibroblast-derived spheroids demonstrated differentiation capacity into adipogenic and osteogenic lineages.
• Single-cell RNA sequencing revealed a proliferative cell cluster with high expression of MSC and self-renewal genes.

Conclusions:

• SIST offers a rapid, high-yield method for generating proliferative, multipotent adult stem cell-like cells from various somatic cell types.
• This approach bypasses difficulties associated with traditional ASC culture and may significantly advance regenerative medicine.
• The SIST process holds potential for creating cell-based therapies and tissue engineering applications.