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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.
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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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Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Stages of Infection01:26

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Factors Affecting the Risk of Infection01:26

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
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Sexually Transmitted Infections01:26

Sexually Transmitted Infections

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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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Video Experimental Relacionado

Updated: Jan 24, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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Las plaquetas atadas en infecciones graves.

Gina Perrella1, Julie Rayes1

  • 1Department of Cardiovascular Sciences, College of Medicine and Health, School of Medical Sciences, University of Birmingham, Birmingham, UK.

Science (New York, N.Y.)
|January 22, 2026
PubMed
Resumen

Las estructuras plaquetarias en las paredes de los vasos sanguíneos contribuyen al aumento de la inflamación y el riesgo de sangrado. Este hallazgo destaca un factor clave en la salud vascular y la hemostasis.

Área de la Ciencia:

  • Biología Cardiovascular Biología Cardiovascular
  • Hematología Hematología.
  • Investigación de la inflamación Investigación de la inflamación.

Sus antecedentes:

  • Las plaquetas son cruciales para la hemostasis, pero también están implicadas en procesos inflamatorios.
  • La integridad de la pared vascular es esencial para prevenir el sangrado y la trombosis.
  • Comprender las contribuciones celulares a la patología vascular es vital.

Objetivo del estudio:

  • Para investigar el papel de las estructuras derivadas de las plaquetas dentro de las paredes de los vasos sanguíneos.
  • Para determinar el impacto de estas estructuras en la inflamación.
  • Para evaluar su contribución al riesgo de sangrado.

Principales métodos:

  • Análisis histológico de tejidos de vasos sanguíneos.

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  • La tinción inmunohistoquímica para los marcadores de plaquetas.
  • Evaluación de marcadores inflamatorios y ensayos de sangrado.

    • Principales resultados:

    • Se identificaron estructuras derivadas de las plaquetas dentro de las paredes de los vasos sanguíneos.
    • La presencia de estas estructuras se correlacionó con un aumento de los marcadores inflamatorios.
    • El aumento de las estructuras plaquetarias se asoció con una mayor tendencia a la hemorragia.

    Conclusiones:

    • Las estructuras derivadas de las plaquetas en las paredes de los vasos promueven la inflamación.
    • Estas estructuras exacerban el riesgo de sangrado, afectando la salud vascular.
    • Dirigirse a estas estructuras puede ofrecer un potencial terapéutico.