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Cytotoxic T Cells-mediated Immune Response01:27

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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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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Dynamic Transcriptional Programs During Single NK Cell Killing: Connecting Form to Function in Cellular

Joseph T Decker1,2, Matthew S Hall1, Devak Nanua1

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Cellular and Molecular Bioengineering
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Nuclear Factor Kappa B (NF-κB) activity correlates with natural killer (NK) cell killing of cancer cells. This study links intracellular signaling to NK cell function, advancing cancer therapy development.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Biology

Background:

  • Natural killer (NK) cell therapies show promise for cancer treatment, but progress for solid tumors is slow.
  • Understanding the intracellular signaling pathways that drive NK cell killing is crucial for developing effective therapies.

Purpose of the Study:

  • To correlate transcriptomic data with functional output in NK cell killing using a combined single-cell RNA sequencing and live cell imaging approach.
  • To identify intracellular signaling molecules that drive the NK cell killing phenotype.

Main Methods:

  • Utilized a model system of NK-92 cells killing HeLa cervical cancer cells.
  • Combined single-cell RNA sequencing (10× Genomics) with live cell imaging and reporter constructs.
  • Inferred transcription factor activity using Viper and DoRothEA R packages.

Main Results:

  • NK cells exhibited heterogeneous killing activity over 10 hours.
  • Nuclear Factor Kappa B (NF-κB) activity was identified as a potential driver of NK cell function.
  • NF-κB activity significantly correlated with past NK cell killing activity, while STAT1 and MYC did not.

Conclusions:

  • The integration of live cell imaging of transcription factor activity with single-cell RNA sequencing effectively links transcriptomic data to functional phenotypes.
  • This approach enhances the understanding of NK cell-mediated cytotoxicity, paving the way for improved cancer immunotherapies.