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Prostaglandins Other Lipid Mediat. 2014 Aug;112:34-8. doi: 10.1016/j.prostaglandins.2014.07.004. Epub 2014 Aug 1.

Postpartum levels of 8-iso-prostaglandin F2α in plasma and milk phospholipid fractions as biomarker of oxidative stress in first-lactating dairy cows.

Author information

1
Leibniz Institute for Farm Animal Biology, Institute of Reproductive Biology, Dummerstorf, Germany.
2
Leibniz Institute for Farm Animal Biology, Institute of Reproductive Biology, Dummerstorf, Germany. Electronic address: weitzel@fbn-dummerstorf.de.

Abstract

F2-isoprostanes such as 8-iso-prostaglandin F2<alpha> (8-iso-PGF2α) are formed by free radical-catalyzed mechanisms from membrane phospholipids and from low density lipoproteins through peroxidation of arachidonic acid. Esterified 8-iso-PGF2α is cleaved by phospholipases, circulates in blood and is excreted as putatively harmful oxidatively modified lipid via the kidney into urine. In this study we demonstrate that 8-iso-PGF2α concentrations in plasma samples from heifers are higher (p<0.005) compared to those from first-lactating dairy cows at 71 days postpartum. Furthermore, plasma 8-iso-PGF2α concentrations vary with ovarian activity and differ in response to luteolytic initiation as well as activation of the hypothalamic-pituitary-gonadal axis between heifers and first-lactating cows. Sustainable concentrations of 8-iso-PGF2α (50-150 pg/ml) are detectable in the phospholipid fraction of milk, suggesting milk as an additional excretion route for 8-isoprostanes. Plasma levels largely paralleled levels in milk (p<0.001). Plasma phospholipid 8-iso-PGF2α concentrations in cyclic cows decreased (p<0.05) from day 38 to day 71 postpartum, whereas milk phospholipid 8-iso-PGF2α rather increased (p<0.05). Cyclic cows tend to have higher 8-isoprostane levels compared to acyclic animals. In contrast to lipohydroperoxides, concentration of 8-iso-PGF2α were not correlated with milk yield (p>0.05). Our data indicate 8-iso-PGF2α may be a novel biomarker of oxidative stress in dairy cow, which is detectable in blood as well as in milk.

KEYWORDS:

8-Isoprostane; Biomarker; F(2)-isoprostane; Fertility; Oxidative stress

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