Alexei Volkov
Stem cell plasticity is a concept that has emerged to explain the phenomenon of stem cells from one tissue transdifferentiating or dedifferentiating to produce progeny of another tissue. While there is no official definition of stem cell plasticity, it is generally understood as the ability of a cell to cross over its identity from one organ to another. This has significant implications for regenerating damaged tissues and replacing lost cells. Recent studies indicate that adult-derived stem cells are much more plastic than previously thought, with the ability to cross lineage boundaries. For example, bone marrow cells have been shown to contribute to muscle, lung, gastric, intestinal, lung, and liver cells. Furthermore, guide-integrated adult stem cells (giaSCs) have been shown to have high plasticity and can repair skin wounds and small intestinal tissue damage in mouse models. However, it is important to note that stem cell plasticity is a rare event, and the apparent donor stem cell differentiation may be a result of a monocyte-macrophage fusion event with epithelial cells of recipient tissues.
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What You'll Learn
Multipotent adult progenitor cells
MAPCs have been shown to have immunomodulatory properties and are non-immunogenic, meaning they do not trigger an immune response in the recipient. This makes them promising for clinical use in tissue repair and regeneration without the risk of immune rejection. They also possess immunosuppressive capabilities, which could be useful in managing and preventing graft-versus-host disease (GVHD).
The plasticity of MAPCs challenges the traditional understanding of tissue-specific stem cells. Initially, it was believed that stem cells were committed to producing specific tissues. However, the discovery of MAPCs and other adult stem cells with plasticity suggests that, under certain conditions, stem cells can differentiate into cell types of a different tissue origin. This phenomenon is known as transdifferentiation or dedifferentiation, where a stem cell switches to another precursor or a differentiated cell gains the phenotype of another differentiated cell.
The ability of MAPCs to differentiate into various cell types and their immunomodulatory properties make them a valuable tool in regenerative medicine. They can contribute to repairing damaged tissues and replacing lost cells without causing tumors or immune rejection. However, it is important to note that stem cell plasticity is a complex and controversial field, and further research is needed to fully understand the mechanisms and potential applications of MAPCs.
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Bone marrow to liver
The plasticity of stem cells refers to the ability of a cell to cross over its identity from one organ to another. In other words, it is the ability of a stem cell to differentiate into cells other than the expected tissues.
Bone marrow-derived stem cells have been shown to contribute to liver regeneration in several studies. Bone marrow stem cells, such as hematopoietic, mesenchymal, and endothelial progenitor cells, possess characteristics that make them ideal candidates for liver regenerative therapies. Hematopoietic stem cells (HSCs) have been the most studied and best-understood stem cell within the body. They have been proven invaluable in the treatment of numerous hematologic and non-hematologic malignancies. HSCs can be induced to differentiate into liver cells in vitro, and this differentiation may also occur in vivo in physiological conditions and after liver injury.
Mesenchymal stem cells (MSCs) are rare cells, making up only 0.001% to 0.01% of the total nucleated cell population within the bone marrow. They are part of the BM stromal microenvironment that provides support to the hematopoietic stem cell and drives the process of hematopoiesis. MSCs can also be induced to differentiate into liver cells in vitro, and this differentiation may occur in vivo as well. However, it is unclear whether MSCs contribute to hepatocyte regeneration.
Endothelial progenitor cells (EPCs) have been shown to engraft within the injured liver and generate new blood vessels through the secretion of growth factors. They have the potential to repair damaged liver tissue by promoting supportive factors necessary for the host's endogenous hepatocyte repair mechanisms.
In summary, bone marrow-derived stem cells, specifically HSCs, MSCs, and EPCs, have all been shown to have the potential to differentiate into liver cells and contribute to liver regeneration. This makes them promising candidates for liver regenerative therapies.
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Stem cell plasticity in mammals
The phenomenon of stem cell plasticity is based on the assumption that stem cells are "plastic" and can transdifferentiate into stem cells committed to various non-hematopoietic organs and tissues. While there is no official definition of stem cell plasticity, it can be defined as the ability of tissue-specific adult stem cells to acquire the fate of cell types different from their tissue of origin. This field has generated controversy and excitement among scientists, with some studies suggesting that stem cell plasticity is an extremely rare event.
Stem cells with high plasticity have the potential to repair damaged tissue by differentiating into tissue-specific cell types. For example, bone marrow cells have been shown to contribute to muscle, lung, gastric, intestinal, and liver cells following transplantation. Additionally, neuronal stem cells can contribute to blood, muscle, and neuronal tissues. In mammals, including humans, newly differentiated cells are continuously generated from stem cells throughout development and adulthood.
The concept of adult stem cell plasticity emerged from the work of Ferrari et al., who described the repair of degenerating muscle from bone marrow-derived myogenic progenitors in mice. Plasticity is defined as the ability of a cell to cross over its identity from one organ to another. Stem cell plasticity has been observed during embryogenesis, and adult stem cells may also exhibit plasticity across tissue lineage boundaries. For instance, bone marrow-derived stem cells can engraft as hepatocytes in response to liver damage.
Guide-integrated adult stem cells (giaSCs) are a type of stem cell with high plasticity and low immunogenicity that can repair skin wounds and small intestinal tissue damage in mouse models without causing tumors. These cells are generated from the interaction between blood-derived guide cells and mesenchymal stromal cells derived from umbilical cord tissue. The ability to generate highly plastic stem cells through cell-cell communication holds significant promise for regenerating damaged tissues and replacing lost cells in humans.
In summary, stem cell plasticity in mammals refers to the ability of stem cells to differentiate into cell types outside their normal progeny. While there is evidence of stem cell plasticity in adult mammals, it is a rare event, and most studies suggest that apparent donor stem cell differentiation is due to monocyte-macrophage fusion with epithelial cells of recipient tissues. Further research is needed to understand and enhance the plasticity of stem cells for therapeutic purposes.
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Stem cell therapeutics
Stem cells have the ability to differentiate into various cell types, making them promising candidates for regenerative medicine and therapeutic applications. Stem cell therapeutics involves leveraging the self-renewal and differentiation properties of stem cells to regenerate damaged tissues or replace lost cells. This field of research holds potential for treating and possibly reversing diseases.
Types of Stem Cells
Embryonic stem cells, progenitor stem cells, and induced pluripotent stem cells are some examples of stem cell types being explored for therapeutic purposes. Each type has unique characteristics and potential advantages for specific applications. For instance, embryonic stem cells are known for their pluripotency, while induced pluripotent stem cells offer the possibility of generating patient-specific cells for personalized medicine.
Applications in Regenerative Medicine
Plasticity of Stem Cells
Stem cell plasticity refers to the ability of stem cells to "transdifferentiate" or "dedifferentiate" and give rise to cell types different from their original tissue of origin. This phenomenon challenges the traditional understanding of stem cell commitment to specific lineages. For example, bone marrow cells have been observed to contribute to muscle, lung, gastric, intestinal, and liver cells.
Guide-Integrated Adult Stem Cells (giaSCs)
Guide-integrated adult stem cells (giaSCs) are a type of stem cell with high plasticity and low immunogenicity. They are generated through the interaction of blood-derived guide cells and mesenchymal stromal cells from umbilical cord tissue. giaSCs have shown potential in repairing skin wounds and small intestinal tissue damage in mouse models without causing immune rejection or tumors, making them promising candidates for regenerative medicine applications.
In summary, stem cell therapeutics is a rapidly evolving field that holds great promise for treating and potentially reversing a range of diseases. The plasticity of stem cells and their ability to differentiate into various cell types are key factors driving the development of innovative regenerative therapies. As research progresses, we can expect to see more clinical applications of stem cell therapeutics in the future.
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Embryonic stem cell plasticity
Stem cells have inherent properties of self-renewal and differentiation, making them promising for regenerating damaged tissues or replacing lost cells. Embryonic stem cells (ESCs) are associated with a high degree of plasticity, allowing them to self-renew and differentiate into various somatic cells. This plasticity enables ESCs to follow a hierarchical pattern towards tissue specificity, eventually resulting in permanent cell cycle arrest and a loss of cellular plasticity.
ESCs are derived from the inner cell mass of blastocyst-stage embryos. They can differentiate into any cell type of the three germ layers: neuroectoderm, endoderm, and mesoderm. This differentiation process involves a step-by-step progression through lineage-specific somatic stem cells and progenitors, leading to specialized tissue-specific cells. The acquisition of specific cellular shape and function limits lineage potential and culminates in terminal differentiation, resulting in reduced cellular plasticity.
The plasticity of ESCs is particularly evident during embryogenesis, where they play a crucial role in the development of various tissues and organs. Their ability to self-renew and differentiate makes them a promising avenue for regenerative medicine and repairing damaged tissues. ESCs can be guided to differentiate into specific cell types, offering potential for therapeutic applications in treating various diseases and injuries.
While ESCs exhibit remarkable plasticity, it is important to note that their differentiation potential must be carefully managed to avoid tumor formation. Current cell-based therapies using stem cells often face limitations due to restricted differentiation capabilities or the need for strict control to prevent tumorigenicity. However, by understanding and harnessing the plasticity of ESCs, researchers are exploring their potential for regenerative purposes and the treatment of various medical conditions.
In conclusion, embryonic stem cell plasticity refers to the ability of ESCs to self-renew and differentiate into diverse somatic cells. This plasticity is most prominent during embryogenesis, where ESCs contribute to the formation of tissues and organs. With their high degree of plasticity, ESCs hold significant promise for regenerative medicine and repairing damaged tissues. However, careful management of their differentiation potential is essential to prevent tumor formation and ensure safe and effective therapeutic applications.
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Frequently asked questions
Stem cell plasticity is the phenomenon where stem cells, which are usually committed to giving rise to expected tissues, may differentiate into cells other than these expected tissues.
There are four recognised plasticity pathways: transdetermination, transdifferentiation, indirect differentiation, and direct differentiation.
Guide-integrated adult stem cells (giaSCs) are human stem cells with high plasticity and low immunogenicity, and no tumorigenicity when transplanted into immunodeficient mice. Bone marrow-derived stem cells (BMSCs) also show significant plasticity, as do multipotent adult progenitor cells (MAPCs). Recent studies also indicate that adult-derived stem cells are much more plastic than was previously thought.
Stem cell plasticity has the potential to be used in regenerative medicine to repair damaged tissue by differentiating into tissue-specific cell types.
