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, beta-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 17beta-oestradiol (10 mg, 3 im
injections at 17 days intervals),
clenbuterol (20 microg kg(-1), per os for 40 days) and
dexamethasone (4 mg per os for 6 days and, then, 5mg for further 6 days) for a total of 55 days. The second one was used as control. Blood sampling were taken at T(0) and after 15 (T(1)), 34 (T(2)), 48 (T(3)) days as well as the day before slaughtering (T(4)). Immune endpoints considered were the thymus weight, the serum
immunoglobulin G (
IgG) and M (
IgM) levels, the lymphocyte proliferation assay and the lymphocyte
interleukins 1beta and 8, tumour
necrosis factor alpha and
interferon gamma (IFN-gamma) 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 T(1), whereas in the second part of the study increasing levels (P<0.05 at T(2) and T(4) for
IgM and
IgG, respectively) were recorded; (c) an overall reduction (P<0.001, P<0.05) of lymphocyte proliferation rate at T(1); in phytohaemagglutinin-stimulated cells, such a decrease was delayed up to T(2) (P<0.05); (d) a reduction (P<0.05) in IFN-gamma
mRNA levels at T(1) and T(2). 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.