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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
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Central tolerance promoted by cell chimerism.

Ann Zeleniak1, Massimo Trucco2

  • 1Institute of Cellular Therapeutics, Allegheny Health Network, Pittsburgh, PA, 15212.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for organ transplantation tolerance by creating stable chimerism using donor thymic organoids. This approach could eliminate the need for immunosuppressive drugs, reducing patient infections and improving transplant outcomes.

Keywords:
chimerismthymic organoidstolerance

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Area of Science:

  • Immunology
  • Transplantation Biology
  • Regenerative Medicine

Background:

  • Allotransplantation traditionally requires potent immunosuppressants, increasing infection risk.
  • Stable chimerism (donor-recipient cell mixing) can enable reduced immunosuppression but is difficult to achieve.
  • The recipient's thymus normally prevents self-reactive T cells while allowing alloreactive T cells.

Purpose of the Study:

  • To establish a novel method for inducing stable allogeneic chimerism and long-term transplant tolerance.
  • To overcome the limitations of achieving persistent chimerism for reduced immunosuppression.
  • To investigate the potential of thymic organoids in facilitating transplantation compatibility.

Main Methods:

  • Cotransplantation of donor organ grafts with thymic organoids.
  • Populating thymic organoids with donor precursor cells, including inducible pluripotent stem cell (iPSC)-derived thymic epithelial cells (TECs) and CD34+ bone marrow precursors.
  • Utilizing humanized mouse models to assess chimerism and tolerance induction.

Main Results:

  • The cotransplantation strategy successfully generated stable, long-term chimerism in recipients.
  • Implantation of iPSC-derived TECs and CD34+ cells within thymic organoids induced tolerance to donor tissues/organs.
  • Demonstrated potential for inducing tolerance even in Major Histocompatibility Complex (MHC)-noncompatible settings.

Conclusions:

  • Cotransplantation with engineered thymic organoids is a viable strategy for achieving stable allogeneic chimerism.
  • This innovative approach holds promise for eliminating the need for immunosuppressive drugs in allotransplantation.
  • The technology could significantly reduce recipient morbidity and improve the success of transplants, including between MHC-mismatched individuals.