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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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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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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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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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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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Commitment is the  process whereby stem cells:
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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Inflammatory Signaling Pathways in Preleukemic and Leukemic Stem Cells.

Shayda Hemmati1,2, Tamanna Haque1,2,3, Kira Gritsman1,2,3

  • 1Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, United States.

Frontiers in Oncology
|November 29, 2017
PubMed
Summary

Inflammatory signals can cause hematopoietic stem cells (HSCs) to malfunction, leading to bone marrow failure and leukemia. Modulating these signals offers potential therapeutic strategies for myeloid malignancies.

Keywords:
NF-κBinflammatoryinterferoninterleukinleukemic stem cellpreleukemictoll-like receptortumor necrosis factor

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Area of Science:

  • Hematology
  • Immunology
  • Oncology

Background:

  • Hematopoietic stem cells (HSCs) maintain blood homeostasis but can be dysregulated by inflammation.
  • Inflammatory signals trigger HSC cycling and myeloid differentiation, potentially leading to bone marrow failure.

Purpose of the Study:

  • To review the role of inflammatory signaling pathways in the development of preleukemic stem cells (pre-LSCs).
  • To explore the progression to myelodysplastic syndrome (MDS), myeloproliferative neoplasms, and acute myeloid leukemia (AML).
  • To discuss therapeutic strategies targeting inflammatory pathways in myeloid malignancies.

Main Methods:

  • Literature review of inflammatory signaling pathways.
  • Analysis of HSC behavior under inflammatory conditions.
  • Examination of pre-LSC generation and disease progression.

Main Results:

  • Prolonged inflammation causes HSC loss, genetic/epigenetic changes, and clonal hematopoiesis.
  • Inflammation drives the emergence of pre-LSCs, leading to MDS, MPNs, and AML.
  • Targeting inflammatory pathways in AML can modulate leukemic stem cell (LSC) activity.

Conclusions:

  • Inflammatory signaling is a critical driver in myeloid malignancies.
  • Modulating inflammation presents a promising therapeutic avenue for treating MDS, MPNs, and AML.
  • Understanding these pathways is key to developing novel cancer therapies.