Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL).

Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Research Abstract Details 

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Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Abstract Text:

A C Chan,K Tran,D D Pyke,W S Powell,

Activation of polymorphonuclear neutrophils (PMNL) leads to the release of arachidonate from cellular phospholipids via a phospholipase A2, and conversion of products of the 5-lipoxygenase pathway. Evidence to date indicates the dietary vitamin E ((R,R,R)-alpha-tocopherol) can influence both cyclooxygenase and phospholipase A2 activities and that the effect of this vitamin is cell/tissue specific. The present study was undertaken in order to examine the effects of varying dietary tocopherol on PMNL tocopherol content and 5-lipoxygenase product profile using the ionophore A23187 as stimulant in the presence and absence of exogenous arachidonate. Feeding semi-purified diets containing 0, 30 or 3000 ppm of (R,R,R)-alpha-tocopherol acetate to weanling rats for 17 weeks resulted in a dose-related enrichment of PMNL tocopherol. Stimulation of PMNL elicited a significant and rapid loss of tocopherol. When PMNL were stimulated with A23187 alone, the synthesis of 5-HETE, LTB4 and 19-hydroxy-LTB4 was decreased in proportion to increasing dietary tocopherol concentrations. However, when exogenous arachidonate was provided with A23187, intermediate amounts of dietary tocopherol (30 ppm) still suppressed the formation of 5-lipoxygenase products, but high doses (3000 ppm) did not have any additional inhibitory effect. This differential response to high concentrations of vitamin E in the presence and absence of exogenous arachidonate highly suggest that at these concentrations, tocopherol may act principally at the level of substrate release whereas at lower concentrations, 5-lipoxygenase is inhibited. Data from this study demonstrated that attenuation of the formation of 5-lipoxygenase products in PMNL can be achieved by dietary vitamin E enrichment.

Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Publishing Authors By Initials

AC Chan,K Tran,DD Pyke,WS Powell,

For similar heterocyclic compounds: heterocyclic compounds, 2-ring: benzopyrans: vitamin e: tocopherols: alpha-tocopherol research abstracts see: heterocyclic compounds: heterocyclic compounds, 2-ring: benzopyrans: vitamin e: tocopherols: alpha-tocopherol research

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Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Biochimica et biophysica acta

VOLUME: 1005

Page Numbers: 265-9

Journal Abbreviation: Biochim. Biophys. Acta

ISSN: 0006-3002

DAY: 17

MONTH: Oct

YEAR: 1989

Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Information

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LANGUAGE: eng

NlmUniqueID: 217513

Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Keywords Mesh Terms:

KEYWORDS: alpha-Tocopherol

MESH TERMS: analogs & derivatives

Chemical & Substance for Abstract: Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL). Information

Substance Name: Phospholipases A2

Registry Number: EC 3.1.1.4

Grant and Affiliation Information for Effects of dietary vitamin E on the biosynthesis of 5-lipoxygenase products by rat polymorphonuclear leukocytes (PMNL).

AFFILIATION: Department of Biochemistry, School of Medicine, University of Ottawa, Ontario, Canada.

Country: NETHERLANDS

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MEDLINETA: Biochim Biophys Acta

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