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Human neutrophil (PMN) oxygen radical production and the cytoskeleton

M E Wiles1, J A Dykens, C D Wright

  • 1Parke-Davis Pharmaceutical Research Division, Warner-Lambert Co., Ann Arbor, MI, USA.

Life Sciences
|January 1, 1995
PubMed

Insights

Neutrophil activation by fMLP generates oxygen radicals, influenced by cytoskeletal agents. Disrupting microtubules or stabilizing f-actin reduces radical production, while stabilizing microtubules or disrupting f-actin increases it.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Polymorphonuclear neutrophils (PMNs) are crucial immune cells involved in oxidative burst responses.
  • The cytoskeleton plays a significant role in regulating cellular functions, including PMN activation and radical generation.
  • Understanding the interplay between cytoskeletal dynamics and PMN oxidative activity is essential for comprehending inflammatory processes.

Purpose of the Study:

  • To investigate the role of cytoskeletal structures, specifically f-actin and microtubules, in modulating oxygen radical generation by PMNs.
  • To determine how agents that stabilize or disrupt f-actin and microtubules affect PMN oxidative burst upon stimulation with N-formyl-1-methionyl-1-leucyl-1-phenylalanine (fMLP).

Main Methods:

  • Electron paramagnetic resonance (EPR) spectroscopy was employed to detect and quantify oxygen radicals.
  • The spin trap 5,5-dimethyl-1-pyrroline n-oxide (DMPO) was used to monitor hydroxyl radical production.
  • PMNs were treated with fMLP in the presence of agents affecting cytoskeletal structures: phalloidin (f-actin stabilizer), cytochalasin B (CB, f-actin disruptor), taxol (microtubule stabilizer), and colchicine (microtubule disruptor).

Main Results:

  • Unstimulated PMNs, or those treated with cytoskeletal agents alone, did not produce detectable radical signals.
  • fMLP stimulation induced significant hydroxyl radical production.
  • Cytochalasin B (CB) augmented fMLP-mediated radical production, whereas phalloidin attenuated it.
  • Colchicine significantly attenuated fMLP-induced radical production, while taxol significantly increased it.

Conclusions:

  • Cytoskeletal integrity significantly influences PMN oxidative burst.
  • Stabilization of f-actin and disruption of microtubules attenuate PMN radical production.
  • Disruption of f-actin and stabilization of microtubules enhance PMN radical production, suggesting domain-specific cytoskeletal contributions to oxidative activity.

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