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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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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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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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Related Experiment Video

Updated: Dec 12, 2025

Isolating Human Peripheral Blood Mononuclear Cells and CD4+ T cells from S&#233;zary Syndrome Patients for Transcriptomic Profiling
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SAMHD1 does it again, now in resting T cells.

Nan Yan1, Judy Lieberman

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA. nan.yan@utsouthwestern.edu

Nature Medicine
|November 9, 2012
PubMed
Summary
This summary is machine-generated.

Host SAMHD1 protein restricts HIV-1 replication in resting CD4(+) T cells. This protein, sterile alpha motif and histidine/aspartic domain-containing protein 1 (SAMHD1), works by breaking down deoxynucleoside triphosphates (dNTPs) essential for viral reverse transcription.

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Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • HIV-1 replication is known to be inefficient in resting CD4(+) T cells, a key reservoir for the virus.
  • The precise mechanisms underlying this restriction have remained incompletely understood.
  • Previous research identified sterile alpha motif and histidine/aspartic domain-containing protein 1 (SAMHD1) as an HIV restriction factor in myeloid cells.

Purpose of the Study:

  • To investigate the role of SAMHD1 in restricting HIV-1 replication in resting CD4(+) T cells.
  • To elucidate the molecular mechanism by which SAMHD1 inhibits viral replication in this cell type.

Main Methods:

  • Analysis of HIV-1 replication kinetics in resting CD4(+) T cells.
  • Assessment of SAMHD1 expression and activity in these cells.
  • Measurement of intracellular deoxynucleoside triphosphate (dNTP) levels.

Main Results:

  • SAMHD1 was found to restrict HIV-1 replication in resting CD4(+) T cells.
  • SAMHD1 restricts HIV-1 by hydrolyzing deoxynucleoside triphosphates (dNTPs).
  • Reduced dNTP levels impair the viral reverse transcription process.

Conclusions:

  • SAMHD1 is a key host factor responsible for restricting HIV-1 replication in resting CD4(+) T cells.
  • The enzymatic activity of SAMHD1 in depleting dNTPs is crucial for this restriction.
  • Understanding SAMHD1's role offers potential therapeutic targets for HIV-1 infection.