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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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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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Paracrine signaling allows cells to communicate with their immediate neighbors via secretion of signaling molecules. Such a signal can only trigger a response in nearby target cells because the signal molecules degrade quickly or are inactivated if not taken up. Prominent examples of paracrine signaling include nitric oxide signaling in blood vessels, synaptic signaling of neurons, the blood clotting system, tissue repair/wound healing, and local allergic skin reactions. Nitric oxide as a...
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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.
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Updated: Apr 15, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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Bacteria-induced intracellular signalling in platelets.

Archie McNicol1

  • 1College of Pharmacy and.

Platelets
|March 26, 2015
PubMed
Summary

Bacteria activate platelets through various signaling pathways, some shared and some unique to species like Streptococcus and Porphyromonas gingivalis. Understanding these pathways is key to platelet activation research.

Area of Science:

  • Immunology
  • Microbiology
  • Hematology

Background:

  • Platelet activation by bacteria is a recognized phenomenon, influenced by bacterial strain and donor variations.
  • The molecular mechanisms underlying bacterial-induced platelet activation have been a focus of research for over a decade.
  • Specific bacterial species, notably Streptococcal and Porphyromonas gingivalis, engage distinct signaling cascades to stimulate platelets.

Purpose of the Study:

  • To delineate the signaling pathways involved in bacterial-induced platelet activation.
  • To compare and contrast the mechanisms employed by different bacterial species in platelet stimulation.
  • To elucidate the roles of specific receptors and intracellular molecules in these activation processes.

Main Methods:

  • Review and synthesis of existing studies on bacterial-platelet interactions and signaling.
Keywords:
BacillusPorphyromonasStreptococcusbacteriaplateletssignalling

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  • Analysis of pathways initiated by bacterial engagement with platelet receptors, including FcγRIIA, protease-activated receptors, and Toll-like receptors.
  • Identification of key intracellular signaling molecules such as Syk, LAT, PLCγ2, PI-3-K, and PLCβ.

    • Main Results:

    • Streptococcal species activate platelets primarily via the FcγRIIA receptor, leading to Syk, LAT, PLCγ2, and PI-3-K activation, resulting in αIIbβ3 integrin expression, thromboxane A2 synthesis, and PF4 release.
    • Porphyromonas gingivalis utilizes a partially shared FcγRIIA/Syk/PLCγ2/PI-3-K pathway but also employs protease-activated receptors (activating PLCβ) and Toll-like receptors (via lipopolysaccharide) through distinct pathways.
    • Evidence suggests additional potential pathways for Streptococcal activation, including ADP-mediated inhibition of adenylyl cyclase, glycoprotein Ib/IX/V, and complement-induced pathways.

    Conclusions:

    • Bacteria stimulate platelets through multiple signaling pathways, with some pathways being common across species and others being unique.
    • The FcγRIIA/Syk/PLCγ2/PI-3-K axis is a significant, conserved pathway in bacterial-induced platelet activation.
    • Species-specific mechanisms, such as those involving protease-activated receptors and Toll-like receptors in P. gingivalis, highlight the complexity of host-pathogen interactions at the platelet level.