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Related Concept Videos

Phagocytosis00:41

Phagocytosis

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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Related Experiment Video

Updated: Aug 26, 2025

Visualizing the Early Stages of Phagocytosis
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Visualizing the Early Stages of Phagocytosis

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Spatial models of pattern formation during phagocytosis.

John Cody Herron1,2, Shiqiong Hu3, Bei Liu3

  • 1Curriculum in Bioinformatics and Computational Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.

Plos Computational Biology
|October 3, 2022
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Summary

This study reveals how Cdc42, a GTPase, drives rosette formation in frustrated phagocytosis. Mathematical models show negative feedback and spatial gradients explain the observed actin podosome patterns during immune cell responses.

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Last Updated: Aug 26, 2025

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"Phagosome Closure Assay" to Visualize Phagosome Formation in Three Dimensions Using Total Internal Reflection Fluorescent Microscopy TIRFM

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Area of Science:

  • Cell biology
  • Immunology
  • Biophysics

Background:

  • Phagocytosis is a critical innate immune process where cells engulf particles like bacteria.
  • Fcγ receptor (FcγR)-mediated phagocytosis, triggered by immunoglobulin G (IgG) binding, initiates signaling cascades for particle ingestion.
  • Frustrated phagocytosis involves cells attempting to internalize IgG micropatterned disks, forming actin-rich podosome rosettes, a pattern mechanism yet to be elucidated.

Purpose of the Study:

  • Investigate the mechanism behind rosette pattern formation in frustrated phagocytosis.
  • Determine the role of Cdc42, a Rho family GTPase, in FcγR-mediated phagocytosis and actin organization.
  • Develop and validate reaction-diffusion models to explain the spatiotemporal dynamics of GTPase activity leading to rosette formation.

Main Methods:

  • Utilized frustrated phagocytosis experimental systems with IgG micropatterned disks.
  • Investigated the involvement of Cdc42 downstream of receptor activation and upstream of actin polymerization.
  • Developed and analyzed reaction-diffusion models incorporating negative feedback and spatial gradients to simulate pattern formation.

Main Results:

  • Identified Cdc42 as a key player in the formation of actin podosome rosettes around IgG disks.
  • Demonstrated that reaction-diffusion models, with modifications like negative feedback, can accurately reproduce the observed rosette patterns.
  • Proposed two distinct mechanisms for pattern generation: one involving an intermediate species forming a ring, and another relying on spatial gradients of activated species.

Conclusions:

  • Cdc42 plays a crucial role in regulating actin organization during frustrated phagocytosis.
  • Mathematical modeling provides a framework for understanding the emergence of complex cellular patterns from molecular signaling.
  • The study suggests experimental approaches to further validate the proposed mechanisms of rosette formation.