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Related Concept Videos

Cells of the Innate Immune Response01:28

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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Analysis of Human Natural Killer Cell Metabolism
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Deciphering Natural Killer Cell Homeostasis.

Aline Pfefferle1, Benedikt Jacobs2,3, Alvaro Haroun-Izquierdo1

  • 1Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden.

Frontiers in Immunology
|June 2, 2020
PubMed
Summary

Natural killer (NK) cells are crucial for innate immunity. Their diverse yet stable repertoire, regulated by receptors and IL-15, offers potential for cancer immunotherapy.

Keywords:
IL-15NK cell differentiationhomeostasismTORnatural killer cells (NK cells)

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Natural killer (NK) cells are key components of the innate immune system, responsible for eliminating infected and cancerous cells.
  • NK cell function is regulated by a complex interplay of inhibitory and activating receptors, leading to diverse phenotypes and functions.
  • Despite constant renewal, the NK cell repertoire within an individual remains remarkably stable over time.

Purpose of the Study:

  • To provide an overview of natural killer (NK) cell differentiation.
  • To discuss the metabolic requirements, plasticity, and transcriptional reprogramming of NK cells during homeostatic proliferation driven by Interleukin-15 (IL-15).
  • To highlight how understanding NK cell regulation can advance NK cell-based cancer immunotherapy.

Main Methods:

  • Review of existing literature on NK cell differentiation, homeostasis, and receptor repertoire.
  • Discussion of metabolic pathways and transcriptional changes during IL-15-mediated proliferation.
  • Analysis of factors contributing to NK cell repertoire stability.

Main Results:

  • NK cell cytotoxic capacity is tightly regulated by a balance of activating and inhibitory receptors.
  • Intra-lineage plasticity and transcriptional reprogramming occur during IL-15-driven homeostatic proliferation.
  • The unique NK cell repertoire is stable despite continuous cell turnover.

Conclusions:

  • Insights into NK cell differentiation and homeostasis are critical for developing effective immunotherapies.
  • Further research into NK cell regulation may unlock new strategies for cancer treatment.
  • Understanding the stability and diversity of the NK cell repertoire is key for therapeutic applications.