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• W2082274687 abstract "While vitamin E has been used for decades in cattle diets, the principle form used traditionally is the synthetic α-isoform acetate or succinate and largely no data exist on the biological partitioning or functionality of the major naturally occurring γ- and δ-isoforms in cattle. Using tyrosine 3’-nitrated protein (pNT) as a biomarker of nitrosative cell stress, we sought to evaluate the effectiveness of short-term feeding supplementation of high content natural α-tocopherol (<em>α-T</em>, 96% α-isomer) compared to high content γ- and δ-enriched low α-content mixed tocopherol oils (<em>γ-T</em>, ~70% <em>γ-</em>, 20% δ-, &lt;5% α-isoform) to mitigate systemic and hepatic aspects of the proinflammatory response to endotoxin (LPS). Calves fed diets supplemented with <em>α-T</em>, <em>γ-T</em> for five days or no tocopherol supplement (<em>T0E</em>) were challenged with a low-level of LPS (0.25 μg/kg, iv, <em>E. coli </em>055:B5) sufficient to effect a liver nitration response. As fed,<em> α-T</em> or <em>γ-T</em> increased plasma and liver content of the respective tocopherols reflecting their relative abundance in the respective diets. Plasma or tissue mediators and biomarkers of the proinflammatory response [plasma concentrations of tumor necrosis factor-α (TNF-α, P&lt;0.001), nitrate+nitrite (NOx, P&lt;0.01), and serum amyloid A (SAA, P&lt;0.001)], and general liver content of pNT (P&lt;0.005) increased after LPS. LPS-mediated increases in TNF-α were not dif- ferent between diet treatments; both plasma NOx (P&lt;0.05) and generalized liver pNT (P&lt;0.03) responses were attenuated significantly in <em>α-T </em>and <em>γ-T versus T0E calves</em>. Plasma SAA was significantly decreased in γ-T calves at 24 h post-LPS relative to responses in <em>α-T</em> or <em>T0E </em>calves. The nitration of the mitochondrial proteins 24 h post-LPS was not only attenuated in <em>α-T</em> and <em>γ-T vs T0E</em>, but also the mitigating effect of <em>γ-T</em> on these specific nitration events was greater than that of <em>α-T </em>(P&lt;0.01). Results are consistent with the concept that short-term <em>α-T</em> or <em>γ-T</em> supplementation can effectively decrease proinflammatory liver pNT after LPS; some mitochondrial nitration targets may be better protected with prophylactic supplementation with γ-,δ-tocopherol enriched oil." @default.
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• W2082274687 date "2013-10-28" @default.
• W2082274687 modified "2023-09-26" @default.
• W2082274687 title "Short-term alpha- or gamma-delta-enriched tocopherol oil supplementation differentially affects the expression of proinflammatory mediators: selective impacts on characteristics of protein tyrosine nitration in vivo" @default.
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• W2082274687 doi "https://doi.org/10.4081/vsd.2013.4703" @default.
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