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Related Concept Videos

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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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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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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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Real-time Monitoring of Mitochondrial Respiration in Cytokine-differentiated Human Primary T Cells
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Mitochondrial Networking in T Cell Memory.

Marc Liesa1, Orian S Shirihai1

  • 1Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.

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Summary
This summary is machine-generated.

T-lymphocytes alter their energy needs based on their function, posing a bioenergetic challenge. Buck et al. discovered that changes in mitochondria shape are linked to T-cell fate decisions.

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Area of Science:

  • Cellular Biology
  • Immunology
  • Mitochondrial Biology

Background:

  • T-lymphocytes exhibit significant metabolic plasticity, adapting ATP demand and nutrient utilization to fulfill diverse functional roles, such as T memory and T effector cells.
  • This metabolic adaptation presents a considerable bioenergetic challenge to the mitochondria within T-cells, impacting cellular remodeling.
  • Understanding these bioenergetic shifts is crucial for comprehending T-cell differentiation and function.

Purpose of the Study:

  • To investigate the relationship between mitochondrial dynamics and T-cell fate determination.
  • To explore how bioenergetic challenges influence T-cell remodeling and functional specialization.
  • To elucidate the role of mitochondrial morphology in T-cell differentiation.

Main Methods:

  • Analysis of T-lymphocyte metabolic states under varying functional demands.
  • Mitochondrial morphology assessment in different T-cell subsets.
  • Correlation studies linking mitochondrial shape changes to T-cell fate markers.

Main Results:

  • T-lymphocytes demonstrate substantial alterations in ATP demand and nutrient utilization.
  • Significant changes in mitochondrial shape were observed and linked to distinct T-cell fates.
  • Mitochondrial remodeling emerges as a key factor in T-cell fate choice.

Conclusions:

  • Mitochondrial shape is a critical determinant in T-cell fate decisions.
  • The bioenergetic demands of T-cell functions necessitate mitochondrial adaptation.
  • This study provides novel insights into the interplay between mitochondrial dynamics and immune cell differentiation.