Related Experiment Video
Updated: Aug 9, 2026
06:55
Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
Published on: February 22, 2020
Natural Killer Cell Subsets and Development
Methods (San Diego, Calif.)
|April 1, 1996
Summary
Natural killer (NK) cells, crucial innate immune cells, develop from bone marrow precursors. Evidence suggests a common progenitor for NK cells and T cells, influenced by cytokines like IL-2.
Area of Science:
- Immunology
- Cell Biology
Background:
- Natural killer (NK) cells are key components of the innate immune system, classified into subsets by CD16 and CD56 expression.
- Distinct cytokine receptor patterns further define functional and developmental NK cell subsets.
- NK cells are believed to originate from bone marrow precursors, requiring an intact marrow environment for development.
Purpose of the Study:
- To explore the developmental pathways and origins of NK cells.
- To investigate the role of cytokines, particularly IL-2, in NK cell development.
- To examine the potential shared ancestry between NK cells and T cells.
Main Methods:
- Analysis of NK cell subsets based on surface marker expression (CD16, CD56).
- In vitro culture of bone marrow cells and CD34(+) cells with IL-2 to generate NK cell effectors.
- Examination of NK and T cell generation from immature thymocytes and fetal liver cells.
Main Results:
- NK cells can be generated in vitro from bone marrow precursors and CD34(+) cells using IL-2.
- Evidence suggests a common progenitor for NK cells and T cells, potentially originating in the fetal liver.
- While IL-2 is critical in vitro, NK cells exist in IL-2 knockout mice, indicating roles for other cytokines in vivo.
Conclusions:
- NK cell development is linked to bone marrow precursors and influenced by cytokines.
- A common NK/T-cell progenitor may exist, differentiating based on thymic or cytokine signals.
- Further research is needed to identify cytokines beyond IL-2 crucial for in vivo NK cell development.
Related Concept Videos
01:15Differentiation of Common Myeloid Progenitor Cells
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...
01:28Cells of the Innate Immune Response
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.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
01:25Immune Surveillance by NK Cells and Phagocytes
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.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
01:23Cells of the Adaptive Immune Response
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...
01:24T Cell Types and Functions
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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
01:27Cytotoxic T Cells-mediated Immune Response
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...
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...