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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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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.
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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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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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Natural killer cells modulation in hematological malignancies.

Céline Baier1, Aurore Fino1, Carole Sanchez2

  • 1UMR1090 TAGC, INSERM , Marseille , France ; UMR1090 TAGC, Aix-Marseille Université , Marseille , France.

Frontiers in Immunology
|January 7, 2014
PubMed
Summary

Hematological malignancies relapse due to minimal residual disease. Natural killer (NK) cells are crucial for immune surveillance, but tumors evade NK cell detection through various mechanisms, including abnormal NK cell function.

Keywords:
hematological malignanciesimmune escapeimmunotherapynatural cytotoxicity receptorsnatural killer cells

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Area of Science:

  • Immunology
  • Hematology
  • Oncology

Background:

  • Hematological malignancies (HM) treatments have improved, but high relapse rates persist due to minimal residual disease.
  • Sustaining long-term remission in HM is critical, often requiring maintenance therapy or enhanced immune response.
  • Tumor cells employ mechanisms to evade immune surveillance, particularly down-regulating HLA class I antigens to escape T-lymphocyte recognition.

Purpose of the Study:

  • To explore the mechanisms by which hematological malignancies escape natural killer (NK) cell surveillance.
  • To highlight the role of NK cells in tumor surveillance and their interaction with cancer cells.
  • To investigate quantitative and qualitative abnormalities in NK cells associated with HM escape.

Main Methods:

  • Review of mechanisms of tumor immune evasion in hematological malignancies.
  • Analysis of the role of natural killer (NK) cells in anti-tumor immunity.
  • Examination of NK cell quantitative and qualitative abnormalities in the context of HM.

Main Results:

  • Tumor cells down-regulate HLA class I antigens, theoretically making them susceptible to NK cell-mediated lysis via the missing-self hypothesis.
  • Despite this, tumors develop strategies to evade NK cell innate immune pressure.
  • Abnormalities in NK cell quantity and quality contribute to the escape of HM from immune surveillance.

Conclusions:

  • NK cells play a vital role in the immune surveillance of hematological malignancies.
  • Hematological malignancies utilize diverse mechanisms to evade NK cell-mediated destruction.
  • Understanding these escape mechanisms, including NK cell dysfunction, is crucial for improving long-term remission rates.