Ascorbate and α-tocopherol differentially modulate reactive oxygen species generation by neutrophils in response to FcγR and TLR agonists

Iain L.C. Chapple, John B. Matthews, Helen J. Wright, Ann E. Scott, Helen R. Griffiths, Melissa M. Grant

Research output: Contribution to journalArticle

Abstract

Periodontitis, a ubiquitous chronic inflammatory disease, is associated with reduced antioxidant defences and neutrophil hyperactivity in terms of reactive oxygen species (ROS) generation. Its phenotype is thus characterized by oxidative stress. We have determined the effect of antioxidant micronutrients ascorbate and α-tocopherol on neutrophil ROS generation. Peripheral neutrophils from periodontally-healthy individuals (n = 20) were challenged with phorbol myristate acetate, IgG-opsonised Staphylococcus aureus, Fusobacterium nucleatum or PBS in the presence and absence of micronutrients (50 μM). Total and extracellular ROS were measured by luminol and isoluminol chemiluminescence respectively. Total and extracellular unstimulated, baseline ROS generation was unaffected by α-tocopherol, but inhibited by ascorbate and a combination of both micronutrients. Fcγ-receptor (Fcγ-R)-stimulated total or extracellular ROS generation was not affected by the presence of individual micronutrients. However, the combination significantly reduced extracellular FcγR-stimulated ROS release. Neither micronutrient inhibited TLR-stimulated total ROS, but the combination caused inhibition. Ascorbate and the micronutrient combination, but not α-tocopherol, inhibited extracellular ROS release by TLR-stimulated cells. Such micronutrient effects in vivo could be beneficial in reducing collateral tissue damage in chronic inflammatory diseases, such as periodontitis, while retaining immune-mediated neutrophil function. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

LanguageEnglish
Pages152-159
Number of pages8
JournalInnate Immunity
Volume19
Issue number2
Early online date21 Aug 2012
DOIs
Publication statusPublished - Apr 2013

Fingerprint

alpha-Tocopherol
Micronutrients
Reactive Oxygen Species
Neutrophils
Periodontitis
Chronic Disease
Antioxidants
Fusobacterium nucleatum
Luminol
Tetradecanoylphorbol Acetate
Luminescence
Staphylococcus aureus
Oxidative Stress
Immunoglobulin G
Phenotype

Keywords

  • ascorbate
  • Neutrophils
  • periodontitis
  • reactive oxygen species
  • tocopherol

Cite this

Chapple, Iain L.C. ; Matthews, John B. ; Wright, Helen J. ; Scott, Ann E. ; Griffiths, Helen R. ; Grant, Melissa M. / Ascorbate and α-tocopherol differentially modulate reactive oxygen species generation by neutrophils in response to FcγR and TLR agonists. In: Innate Immunity. 2013 ; Vol. 19, No. 2. pp. 152-159.
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Ascorbate and α-tocopherol differentially modulate reactive oxygen species generation by neutrophils in response to FcγR and TLR agonists. / Chapple, Iain L.C.; Matthews, John B.; Wright, Helen J.; Scott, Ann E.; Griffiths, Helen R.; Grant, Melissa M.

In: Innate Immunity, Vol. 19, No. 2, 04.2013, p. 152-159.

Research output: Contribution to journalArticle

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