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Effects of nonesterified fatty acids and β-hydroxybutyrate on functions of mononuclear cells obtained from ewes

Nicola LaceteraDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Ombretta FranciDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Daniela ScaliaDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Umberto BernabucciDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Bruno RonchiDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Alessandro NardoneDipartimento di Produzioni Animali, Università degli Studi della Tuscia, 01100 Viterbo, Italy.

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Abstract

Objective—To assess the effects of nonesterified fatty acids (NEFA) and β-hydroxybutyrate (BHBA) on functions of mononuclear cells obtained from ewes.

Animals—6 Sardinian ewes.

Procedure—Mononuclear cells were cultured with concentrations of NEFA (0, 15.6, 31.2, 62.5, 125, 250, 500, 1,000, or 2,000 µmol/L) and BHBA (0, 0.45, 0.9, 1.8, or 3.6 mmol/L). Concentrations of NEFA and BHBA were intended to mimic those of ketotic or healthy ewes, and NEFA and BHBA were tested alone and in combination. Synthesis of DNA was stimulated by use of concanavalin A (Con A) or pokeweed-mitogen (PWM). Secretion of IgM was stimulated by use of PWM.

Results—Synthesis of DNA stimulated by Con A and PWM was significantly inhibited by high concentrations of NEFA (≥ 250 µmol/L) or by a combination of high concentrations of NEFA (≥ 250 µmol/L) and all concentrations of BHBA (≥ 0.45 mmol/L). In contrast, DNA synthesis was not inhibited by low concentrations of NEFA (≤ 125 µmol/L) or by a combination of low concentrations of NEFA (≤ 125 µmol/L) and the lowest concentration of BHBA (0.45 mmol/L). Secretion of IgM was significantly inhibited by all concentrations of NEFA and by all combinations of NEFA and BHBA concentrations. When used alone, none of the concentrations of BHBA inhibited DNA synthesis or IgM secretion.

Conclusions and Clinical Relevance—Reduced immunoresponsiveness during ketosis is likely to be associated with an increase in plasma concentration of NEFA and not with an increase in plasma concentration of BHBA. (Am J Vet Res 2002;63:414–418)

Abstract

Objective—To assess the effects of nonesterified fatty acids (NEFA) and β-hydroxybutyrate (BHBA) on functions of mononuclear cells obtained from ewes.

Animals—6 Sardinian ewes.

Procedure—Mononuclear cells were cultured with concentrations of NEFA (0, 15.6, 31.2, 62.5, 125, 250, 500, 1,000, or 2,000 µmol/L) and BHBA (0, 0.45, 0.9, 1.8, or 3.6 mmol/L). Concentrations of NEFA and BHBA were intended to mimic those of ketotic or healthy ewes, and NEFA and BHBA were tested alone and in combination. Synthesis of DNA was stimulated by use of concanavalin A (Con A) or pokeweed-mitogen (PWM). Secretion of IgM was stimulated by use of PWM.

Results—Synthesis of DNA stimulated by Con A and PWM was significantly inhibited by high concentrations of NEFA (≥ 250 µmol/L) or by a combination of high concentrations of NEFA (≥ 250 µmol/L) and all concentrations of BHBA (≥ 0.45 mmol/L). In contrast, DNA synthesis was not inhibited by low concentrations of NEFA (≤ 125 µmol/L) or by a combination of low concentrations of NEFA (≤ 125 µmol/L) and the lowest concentration of BHBA (0.45 mmol/L). Secretion of IgM was significantly inhibited by all concentrations of NEFA and by all combinations of NEFA and BHBA concentrations. When used alone, none of the concentrations of BHBA inhibited DNA synthesis or IgM secretion.

Conclusions and Clinical Relevance—Reduced immunoresponsiveness during ketosis is likely to be associated with an increase in plasma concentration of NEFA and not with an increase in plasma concentration of BHBA. (Am J Vet Res 2002;63:414–418)