Abstract
Pluripotent stem cells (PSCs) are widely recognized as one of the most promising types of stem cells for applications in regenerative medicine, tissue engineering, disease modeling, and drug screening. This is due to their unique ability to differentiate into cells from all three germ layers and their capacity for indefinite self-renewal. Initially, PSCs were cultured using animal feeder cells, but these systems presented several limitations, particularly in terms of Good Manufacturing Practices (GMP) regulations. As a result, feeder-free systems were introduced as a safer alternative. However, the precise mechanisms by which feeder cells support pluripotency are not fully understood. More importantly, it has been observed that some aspects of the need for feeder cells like the optimal density and cell type can vary depending on conditions such as the developmental stage of the PSCs, phases of the culture protocol, the method used in culture for induction of pluripotency, and intrinsic variability of PSCs. Thus, gaining a better understanding of the divergent roles and necessity of feeder cells in various conditions would lead to the development of condition-specific defined feeder-free systems that resolve the failure of current feeder-free systems in some conditions. Therefore, this review aims to explore considerable feeder-related issues that can lead to the development of condition-specific feeder-free systems.
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Abbreviations
- PSC:
-
Pluripotent stem cell
- ESC:
-
Embryonic stem cell
- iPSC:
-
Induced pluripotent stem cell
- SSC:
-
Spermatogonial stem cell
- VSEL:
-
Very small embryonic-like stem cell
- MAPC:
-
multipotent adult progenitor cell
- pGSC:
-
Pluripotent germline stem cell
- GMP:
-
Good manufacturing practices
- FGF:
-
Fibroblast growth factor
- TGF-β:
-
Transforming growth factor
- GDNF:
-
Glial cell line-derived neurotrophic factor
- EGF:
-
Epidermal growth factor
- LIF:
-
Leukemia inhibitory factor
- ECM:
-
Extracellular Matrix
- KSR:
-
Knockout serum replacement
- MET:
-
Mesenchymal to epithelial transition
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Bardia Khandani suggested the concept, designed the outline, collected and analyzed the data and wrote the manuscript. Mansoureh Movahedin contributed to the study conception and revised the manuscript with her scientific inputs. All authors read and approved the final manuscript.
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Khandani, B., Movahedin, M. Learning Towards Maturation of Defined Feeder-free Pluripotency Culture Systems: Lessons from Conventional Feeder-based Systems. Stem Cell Rev and Rep 20, 484–494 (2024). https://doi.org/10.1007/s12015-023-10662-7
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DOI: https://doi.org/10.1007/s12015-023-10662-7