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Related Concept Videos

Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Overview of Hematopoiesis01:20

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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Upstream Processing

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Upstream processing represents a critical phase in biomanufacturing, wherein biological systems such as microorganisms, mammalian cells, or insect cells are cultivated to produce therapeutic proteins, vaccines, enzymes, or other biologically derived products. This phase encompasses all steps from the selection and genetic manipulation of the production organism to the cultivation of cells in bioreactors under tightly controlled environmental conditions.Host Selection and Genetic OptimizationThe...
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Related Experiment Video

Updated: May 3, 2026

RNA-seq Analysis of Transcriptomes in Thrombin-treated and Control Human Pulmonary Microvascular Endothelial Cells
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Thrombopoietin from beginning to end.

Ian S Hitchcock1, Kenneth Kaushansky

  • 1Department of Medicine, Stony Brook University, Stony Brook, NY, USA.

British Journal of Haematology
|February 7, 2014
PubMed
Summary

Thrombopoietin (TPO) regulates blood cell production and stem cell maintenance. Research into TPO and its receptor c-Mpl has led to successful clinical treatments for blood disorders.

Area of Science:

  • Hematology
  • Molecular Biology
  • Biomedical Research

Background:

  • Thrombopoietin (TPO) is a key hematopoietic cytokine produced by the liver.
  • It is the primary regulator of megakaryocyte progenitor expansion and differentiation.
  • TPO is vital for maintaining hematopoietic stem cells, acting as a pan-hematopoietic cytokine.

Purpose of the Study:

  • To explore the molecular mechanisms of TPO function via its receptor, c-Mpl (MPL).
  • To understand the role of TPO and c-Mpl in human diseases.
  • To highlight TPO as a successful example of bench-to-bedside research.

Main Methods:

  • Extensive research into TPO's molecular mechanisms since its cloning.
  • Investigating downstream signaling pathways activated by TPO-c-Mpl interaction.
Keywords:
megakaryocytesmegakaryocytopoiesismyeloproliferative diseasethrombopoeitin

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  • Analyzing the impact of dysregulated TPO expression or c-Mpl function on disease.

    • Main Results:

    • TPO activates diverse signaling pathways through c-Mpl, promoting cell survival and proliferation.
    • Alterations in TPO or c-Mpl are linked to various blood disorders, including thrombocytosis, thrombocytopenia, and aplastic anemia.
    • TPO mimetics are now in clinical use, demonstrating successful translation of research.

    Conclusions:

    • TPO plays a central, non-redundant role in hematopoiesis.
    • Dysregulation of the TPO/c-Mpl axis contributes to significant human hematological diseases.
    • The study of TPO exemplifies a major success in biomedical research, leading to effective therapies.