Effects of an illicit cocktail on serum immunoglobulins, lymphocyte proliferation and cytokine gene expression in the veal calf

At the European Union level, the use of growth promoters (GPs) in cattle and other food-producing species is forbidden; nonetheless, the illicit use of anabolic hormones, β-agonists and corticosteroids, often administered in cocktails at lower concentrations to overcome control procedures, is still of public concern. The immune system (IS) is a multicomponent system that provide a coordinated response toward infectious diseases, not self-neoplasms and xenobiotics; in this respect, some GPs have been proved able to cause both morphological alterations in lymphoid organs and a modulating effect upon some immunological parameters. Therefore, in the present study the effects of an illicit cocktail upon the cattle IS functions were investigated by using some common endpoints adopted for the IS testing in humans.Twelve cross-bred male veal calves were divided in two experimental groups (n = 6); the first group was administered a cocktail of 17β-oestradiol (10 mg, 3 im injections at 17 days intervals), clenbuterol (20 μg kg−1, per os for 40 days) and dexamethasone (4 mg per os for 6 days and, then, 5 mg for further 6 days) for a total of 55 days. The second one was used as control. Blood sampling were taken at T0 and after 15 (T1), 34 (T2), 48 (T3) days as well as the day before slaughtering (T4). Immune endpoints considered were the thymus weight, the serum immunoglobulin G (IgG) and M (IgM) levels, the lymphocyte proliferation assay and the lymphocyte interleukins 1β and 8, tumour necrosis factor α and interferon γ (IFN-γ) gene expression levels.The administration of the illicit cocktail resulted in: (a) a reduction (P < 0.01) of both the absolute and relative thymus weight; (b) a decrease (P < 0.05) of both IgG and IgM serum levels at T1, whereas in the second part of the study increasing levels (P < 0.05 at T2 and T4 for IgM and IgG, respectively) were recorded; (c) an overall reduction (P < 0.001, P < 0.05) of lymphocyte proliferation rate at T1; in phytohaemagglutinin-stimulated cells, such a decrease was delayed up to T2 (P < 0.05); (d) a reduction (P < 0.05) in IFN-γ mRNA levels at T1 and T2.Taken together, present data suggest that GPs, even given in cocktails at sub-therapeutic dosages, can modulate the cattle IS, thereby hampering itself to exert its physiological role in defence mechanisms. Further studies are required to confirm and investigate these results.