Related Experiment Video

Updated: May 24, 2026

Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer
08:37

Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer

Published on: November 15, 2024

Ethanol suppresses phagosomal adhesion maturation, Rac activation, and subsequent actin polymerization during

John Karavitis1, Eva L Murdoch, Cory Deburghgraeve

  • 1Program of Cell Biology, Neurobiology and Anatomy, Loyola University Medical Center, Maywood, IL, United States.

Cellular Immunology
|March 3, 2012
PubMed

Insights

Ethanol impairs lung immunity by suppressing macrophage phagocytosis. This study reveals ethanol disrupts focal adhesion and cytoskeletal dynamics essential for immune cell function.

Area of Science:

  • Immunology
  • Cellular Biology
  • Toxicology

Background:

  • Ethanol consumption is known to suppress lung immunity.
  • Acute ethanol exposure transiently impairs macrophage phagocytosis of Pseudomonas aeruginosa.
  • The precise cellular mechanisms underlying this suppression require further elucidation.

Purpose of the Study:

  • To investigate the cellular mechanisms by which ethanol suppresses Fc gamma receptor (FcγR)-mediated phagocytosis by macrophages.
  • To examine the role of focal adhesion and cytoskeletal elements in ethanol-induced impairment of phagocytosis.

Main Methods:

  • Macrophages were exposed to ethanol and subsequently challenged with IgG-coated beads.
  • Analysis of actin recruitment to the phagosome, vinculin and paxillin phosphorylation, and Rac activation was performed.

Main Results:

  • Ethanol inhibited the recruitment of actin to the phagosome and dampened vinculin phosphorylation, indicating impaired phagosomal adhesion maturation.
  • Ethanol exposure resulted in significantly reduced Rac activation following FcγR-mediated phagocytosis compared to control cells.
  • Paxillin phosphorylation remained unaffected by ethanol exposure.

Conclusions:

  • Ethanol disrupts critical focal adhesion and cytoskeletal processes necessary for Fc gamma receptor (FcγR)-mediated phagocytosis in macrophages.
  • These cellular disruptions contribute to the observed suppression of lung immunity following ethanol exposure.
  • This study provides the first evidence of the specific cellular mechanisms involved in ethanol-induced FcγR-mediated phagocytosis suppression.

More Related Videos

Use of a Monocyte Monolayer Assay to Evaluate Fcγ Receptor-mediated Phagocytosis06:27

Use of a Monocyte Monolayer Assay to Evaluate Fcγ Receptor-mediated Phagocytosis

Published on: January 2, 2017

High Throughput Fluorometric Technique for Assessment of Macrophage Phagocytosis and Actin Polymerization09:22

High Throughput Fluorometric Technique for Assessment of Macrophage Phagocytosis and Actin Polymerization

Published on: November 27, 2014

Related Concept Videos

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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.
Some...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
Normal cells contain receptors that prevent them from being recognized by phagocytes.