Induced Pluripotent Stem Cells

Definition

Induced pluripotent stem cells (iPSCs) are adult cells that have been genetically reprogrammed to an embryonic stem cell-like state. This allows them to differentiate into almost any cell type in the body, making them a powerful tool for regenerative medicine and disease modeling.

5 Must Know Facts For Your Next Test

1. Induced pluripotent stem cells were first successfully created in 2006 by Shinya Yamanaka, who used four key transcription factors (Oct4, Sox2, Klf4, and c-Myc) to reprogram adult mouse fibroblasts.
2. The ability to generate iPSCs from a patient's own cells allows for the creation of personalized cell lines that can be used for disease modeling, drug testing, and potentially, cell-based therapies.
3. Unlike embryonic stem cells, which are derived from human embryos, iPSCs do not raise the same ethical concerns as they are generated from adult somatic cells.
4. Induced pluripotent stem cells have the potential to differentiate into a wide range of cell types, including neurons, cardiomyocytes, hepatocytes, and pancreatic beta cells.
5. The reprogramming process to generate iPSCs is still not fully efficient, and there are concerns about the genetic stability and potential for tumor formation in iPSC-derived cells.

Review Questions

• Explain the significance of induced pluripotent stem cells in the context of cellular differentiation.
  • Induced pluripotent stem cells (iPSCs) are a revolutionary advancement in the field of cellular differentiation. Unlike adult somatic cells, which are terminally differentiated, iPSCs can be reprogrammed back to a pluripotent state, allowing them to differentiate into virtually any cell type in the body. This has important implications for regenerative medicine, as iPSCs can be used to generate patient-specific cell lines for disease modeling, drug testing, and potentially, cell-based therapies. The ability to reprogram adult cells into a pluripotent state bypasses the ethical concerns associated with the use of embryonic stem cells, making iPSCs a more accessible and versatile tool for studying cellular differentiation and development.
• Describe the key steps involved in the process of generating induced pluripotent stem cells from adult somatic cells.
  • The process of generating induced pluripotent stem cells (iPSCs) from adult somatic cells involves cellular reprogramming, which is the forced expression of specific transcription factors. The seminal work by Shinya Yamanaka and colleagues demonstrated that the introduction of four key transcription factors - Oct4, Sox2, Klf4, and c-Myc - can reprogram adult mouse fibroblasts into a pluripotent state, similar to embryonic stem cells. This reprogramming process involves the activation of endogenous pluripotency genes and the silencing of genes associated with the original somatic cell identity. The resulting iPSCs can then be differentiated into a wide range of cell types, providing a powerful tool for studying cellular differentiation and its applications in regenerative medicine.
• Evaluate the potential benefits and challenges associated with the use of induced pluripotent stem cells in the context of cellular differentiation and regenerative medicine.
  • The development of induced pluripotent stem cells (iPSCs) has revolutionized the field of cellular differentiation and regenerative medicine. The key benefits of iPSCs include their ability to be generated from a patient's own adult cells, bypassing the ethical concerns associated with embryonic stem cells, and their potential to differentiate into a wide range of cell types for disease modeling, drug testing, and cell-based therapies. However, there are also significant challenges that need to be addressed. The reprogramming process to generate iPSCs is still not fully efficient, and there are concerns about the genetic stability and potential for tumor formation in iPSC-derived cells. Additionally, the long-term safety and efficacy of using iPSC-derived cells in clinical applications remains to be fully established. Nonetheless, the remarkable potential of iPSCs to advance our understanding of cellular differentiation and drive progress in regenerative medicine continues to drive intense research in this field.

Related terms

Embryonic Stem Cells:

Embryonic stem cells are pluripotent cells derived from the inner cell mass of a blastocyst, which can differentiate into virtually any cell type in the body.

Somatic Cell Nuclear Transfer: Somatic cell nuclear transfer is a technique used to create embryonic stem cells by transferring the nucleus of an adult somatic cell into an enucleated egg cell.

Cellular Reprogramming: Cellular reprogramming is the process of converting a mature, differentiated cell into a pluripotent or multipotent stem cell through the forced expression of specific transcription factors.