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Related Concept Videos

Structure and Function of Platelets01:18

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...
Disorders of Leukocytes01:27

Disorders of Leukocytes

Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
Leukopenia may result from bone marrow disorders, autoimmune diseases, and infectious diseases. For example, conditions such as multiple myeloma and aplastic anemia can impair the bone marrow's ability to produce adequate leukocytes. Similarly, autoimmune diseases like lupus and viral infections such as HIV can prompt the immune system...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

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Related Experiment Video

Updated: May 29, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

Platelet enzyme abnormalities in leukemias.

S Sharma1, Ahl Purohit, H P Pati

  • 1Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, India. ssharmajd@yahoo.com

Indian Journal of Cancer
|September 17, 2011
PubMed
Summary
This summary is machine-generated.

Platelet enzyme activity, including glucose-6-phosphate dehydrogenase (G6PD), pyruvate kinase (PK), and hexokinase (HK), was evaluated in leukemia patients. Abnormalities in these platelet enzymes suggest underlying issues in megakaryopoiesis, potentially explaining functional platelet defects in leukemia.

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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Last Updated: May 29, 2026

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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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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Area of Science:

  • Hematology
  • Biochemistry
  • Oncology

Background:

  • Leukemia is characterized by abnormal white blood cell proliferation.
  • Platelets play a crucial role in hemostasis, and their function can be impaired in leukemia.
  • Enzyme activity within platelets may offer insights into their dysfunction during leukemia.

Purpose of the Study:

  • To investigate the activity of key platelet enzymes: glucose-6-phosphate dehydrogenase (G6PD), pyruvate kinase (PK), and hexokinase (HK).
  • To assess differences in platelet enzyme activity between various types of leukemia (AML, ALL, CML) and remission status.
  • To explore correlations between platelet enzyme activities and between platelet and red blood cell enzymes.

Main Methods:

  • Enzyme activity assays for G6PD, PK, and HK were performed on platelets from 47 leukemia patients.
  • Patients included those with acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL), and chronic myeloid leukemia (CML) in relapse and remission phases.
  • Statistical analyses were used to compare enzyme activities and identify correlations.

Main Results:

  • Significantly low platelet G6PD activity was observed in AML, ALL, and CML, normalizing during AML remission.
  • Platelet PK activity was elevated during AML relapse but normalized in remission.
  • Platelet HK activity was decreased during remission across all leukemic groups. Positive correlations were found between G6PD and PK in AML, and between PK and HK in ALL remission and CML.

Conclusions:

  • Platelet enzyme defects in leukemia patients suggest inherent abnormalities in megakaryopoiesis.
  • These enzyme alterations may contribute to the observed functional platelet defects in leukemia.
  • No significant correlation was found between red blood cell and platelet enzyme activities.