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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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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...
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Formation of the Platelet Plug01:22

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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...
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Clot Retraction and Fibrinolysis01:16

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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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RNA-seq Analysis of Transcriptomes in Thrombin-treated and Control Human Pulmonary Microvascular Endothelial Cells
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The role of circulating platelet transcripts.

L Clancy1, J E Freedman1

  • 1Department of Medicine, University of Massachusetts Medical School, Worcester, MA, USA.

Journal of Thrombosis and Haemostasis : JTH
|July 8, 2015
PubMed
Summary
This summary is machine-generated.

Platelets, traditionally known for blood clotting, also regulate inflammation and immunity through their RNA. Studying platelet messenger RNA (mRNAs) and microRNA (miRNAs) reveals insights into disease and potential therapeutic targets.

Keywords:
RNAblood plateletsplateletthrombosistranscriptome

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Area of Science:

  • Hematology
  • Immunology
  • Molecular Biology

Background:

  • Platelets are anucleate cells traditionally associated with hemostasis and inflammation.
  • Recent research highlights their expanded role in systemic responses to injury, inflammation, and infection.
  • Platelets' endogenous RNA, including messenger RNA (mRNAs) and microRNA (miRNAs), is an emerging mechanism for regulating immune and inflammatory processes.

Purpose of the Study:

  • To explore the role of platelet endogenous RNA in regulating inflammatory and immune responses.
  • To investigate how platelet mRNA and miRNA profiles correlate with disease states and clinical phenotypes.
  • To elucidate the non-traditional functions of platelets beyond hemostasis.

Main Methods:

  • Analysis of platelet messenger RNA (mRNAs) and microRNA (miRNAs) profiles.
  • Correlation of transcript profiles with disease risk factors and human clinical phenotypes.
  • Investigating the mechanism of platelet RNA in regulating systemic inflammatory and immune responses.

Main Results:

  • Platelet mRNA and miRNA profiles reflect disease states and risk factors.
  • These profiles correlate with specific human clinical phenotypes.
  • Platelet RNA represents a key mechanism in the regulation of inflammatory and immune processes.

Conclusions:

  • Platelet endogenous RNA plays a significant role in regulating the body's inflammatory and immune responses.
  • Understanding platelet transcriptomics offers insights into both thrombotic and non-traditional platelet functions.
  • This research has broad implications for fields such as thrombosis, infection, cancer, and systemic inflammation.