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Related Concept Videos

Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
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Embryonic Stem Cells00:57

Embryonic Stem Cells

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Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
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Tissue transplantation is a significant medical procedure involving the transfer of cells, tissues, or organs from a donor to a recipient, with the primary aim of restoring lost functions. This procedure is crucial in treating a broad spectrum of diseases, including kidney diseases, liver failure, heart disease, and certain types of cancers.
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Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...
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Forced Transdifferentiation

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Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
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Tolerance strategies for stem-cell-based therapies.

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Embryonic stem cell therapies for tissue regeneration face immune rejection. New strategies aim to overcome this, but challenges remain in achieving long-term engraftment of these vital cells.

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Area of Science:

  • Regenerative Medicine
  • Immunology
  • Stem Cell Biology

Background:

  • Embryonic stem cells (ESCs) hold promise for tissue and organ regeneration.
  • Successful ESC-based therapies require long-term engraftment of transplanted cells.
  • Immune rejection is a major barrier for allogeneic (non-self) cell transplants.

Purpose of the Study:

  • To review the challenges and emerging strategies for overcoming immune rejection in ESC-based regenerative medicine.
  • To highlight the need for successful immune tolerance to enable clinical application of ESCs.

Main Methods:

  • Review of current literature on immune rejection of cell transplants.
  • Analysis of established and novel approaches to induce immune tolerance.
  • Discussion of the limitations and challenges associated with these approaches.

Main Results:

  • Standard immunosuppression has limited success in preventing transplant rejection.
  • Emerging strategies include immune re-education for tolerance and use of autologous 'self' stem cells.
  • Both emerging strategies present unique challenges that need to be addressed.

Conclusions:

  • Overcoming immune rejection is critical for the clinical success of ESC-based regenerative therapies.
  • Novel approaches to immune tolerance are under development but require further research.
  • Addressing these immunological hurdles is essential for advancing regenerative medicine.