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Structure and Function of Platelets

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...

Role of Hematopoietic Growth Factors

Role of Hematopoietic Growth Factors

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,...

Overview of Hematopoiesis

Overview of Hematopoiesis

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).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...

Hematopoiesis

Hematopoiesis

The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...

Production of Formed Elements

Production of Formed Elements

Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...

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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Related Experiment Video

Updated: Jun 9, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

[Current models of thrombopoiesis].

¹Labor für Pädiatrische Molekularbiologie, Klinik für Allgemeine Pädiatrie, Otto-Heubner Centrum für Kinder- und Jugendmedizin, Ziegelstr. 5-9, 10098 Berlin. harald.schulze@charite.de

|August 28, 2010

Summary

Platelet production, or thrombopoiesis, occurs both in and outside the bone marrow. Understanding these processes and new blood count parameters can improve diagnosis and treatment for low platelet counts.

Area of Science:

Hematology
Cell Biology
Biophysics

Context:

Platelets are crucial for hemostasis, but their in vivo biogenesis is not fully understood.
Traditional methods for studying platelet production are limited.
Automated blood counters provide new parameters for platelet analysis.

Purpose:

To review current models of thrombopoiesis, including cell biology aspects.
To present findings on megakaryocyte release and extramedullary platelet production.
To discuss the clinical translation of novel platelet parameters.

Summary:

This review explores thrombopoiesis, focusing on megakaryocyte release and extramedullary platelet production.
It examines new parameters from automated blood counters: mean platelet volume (MPV), platelet distribution width (PDW), platelet mass (PCT), and immature platelet fraction (IPF).

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In Vivo Two-photon Imaging of Megakaryocytes and Proplatelets in the Mouse Skull Bone Marrow

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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In Vivo Two-photon Imaging of Megakaryocytes and Proplatelets in the Mouse Skull Bone Marrow

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Published on: July 28, 2021

These parameters offer insights beyond simple platelet counts, aiding in the evaluation of bleeding risk.

Impact:

Enhances understanding of platelet biogenesis and location of production.
Improves clinical interpretation of automated blood count parameters.
Aids in diagnosing causes of thrombocytopenia and guiding therapeutic strategies.