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. 1999 Oct;63(4):261–268.

Effect of administration of oat beta-glucan on immune parameters of healthy and immunosuppressed beef steers.

A Estrada 1, A van Kessel 1, B Laarveld 1
PMCID: PMC1189562  PMID: 10534005

Abstract

In order to assess the effect of oat beta-glucan (ObetaG) administration on immune parameters of beef steers, 3 experiments were carried out. In experiment 1, the in vitro effect of ObetaG on the proliferation of blood lymphocytes, with or without the presence of dexamethasone (DXM), was evaluated. In experiment 2, groups of 12 healthy steers were administered ObetaG or saline solution and immunized with ovalbumin (OVA). Immune parameters studied included IgG antibody levels to OVA, proliferation responses of blood lymphocytes to OVA, and blood leukocyte differential cell counts. For experiment 3, groups of 10 steers were treated with ObetaG and DXM, DXM only, or saline solution, and immunized with OVA and keyhole limpet hemocyanin (KLH). Serum antibody responses to OVA and KLH, serum IgG concentration levels, blastogenic responses of blood lymphocytes to OVA and KLH, differential blood leukocyte numbers, and iron and zinc concentration in serum were tested to evaluate the effect of ObetaG to overcome immunosuppression. The in vitro treatment of naive blood lymphocytes with ObetaG did not increase their ability to proliferate; however, when ObetaG was added to cultures of DXM-treated lymphocytes, a significant (P < 0.05 to P < 0.001) reversion of the immunosuppressive effect of DXM occurred. Administration of ObetaG to clinically healthy steers did not induce significant changes on any of the immune parameters studied. The administration of ObetaG to DXM-treated steers provoked, on Day 25, a significant increase in IgG anti-OVA (P < 0.01) and anti-KLH (P < 0.05) responses vs the DXM only group. On Day 25, the specific proliferation responses of lymphocytes, to both OVA and KLH, were significantly increased (P < 0.05) in ObetaG+DXM group compared to DXM group. On Day 4, a significant increase in the number of leukocytes (P < 0.01) and neutrophils (P < 0.001), and a significant decrease in the number of monocytes (P < 0.05) were observed in the group treated with DXM only compared to ObetaG+DXM group. No significant differences were observed in iron and zinc concentration between ObetaG+DXM and DXM groups. These results indicated that ObetaG did not influence immune responses of naive cells in vitro or of healthy steers in vivo; however, when cells or animals were treated with DXM, ObetaG significantly restored some of the specific and non-specific immune parameters studied.

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Selected References

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