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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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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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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 hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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T-cell commitment inheritance - an agent-based multi-scale model.

Emil Andersson1, Ellen V Rothenberg2, Carsten Peterson1

  • 1Computational Biology and Biological Physics, Centre for Environmental and Climate Science, Lund University, Lund, Sweden.

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|October 31, 2023
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Summary
This summary is machine-generated.

Inheritance plays a key role in T-cell development. This study reveals T-cell commitment is a multi-step process occurring over several cell generations, involving transcriptional changes and loss of specific gene functions.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Computational Biology

Background:

  • T-cell development is a model for lineage commitment from multipotent progenitors.
  • The molecular mechanisms and gene regulation during intrathymic T-cell development are well-studied.
  • The precise timing of decision-making and commitment remains unclear.

Approach:

  • An agent-based multi-scale model was developed to simulate T-cell development.
  • Individual cells were tracked to construct lineage trees and analyze relationships between last common ancestors (LCA).
  • Simulations included wild-type development and knockdown analyses.

Key Points:

  • T-cell commitment is a three-step process spanning multiple cell generations.
  • A transcriptional switch initiates the process, followed by loss of Bcl11b-opposing function.
  • Commitment is finalized by transitioning to the DN2b state after further cell generations.

Conclusions:

  • The study demonstrates inheritance in the T-cell commitment mechanism.
  • The agent-based model provides insights into the temporal dynamics of T-cell lineage commitment.
  • Understanding these dynamics is crucial for comprehending immune cell development and potential disruptions.