NEW CONCEPTS OF ALLERGY TO COWS MILK

CMA is-a diagnostic and therapeutic problem in the field of pediatrics . The response to oral cow's milk challenge was evaluated in patients with suspective CMA. To investigate immune mechanisms in different sub types of CMA, suppressor activity, in vitro IFN-gamma and IL-4 generat ion, eosinophil activation and humoral immune response were measured. Also, changes in the function of the immune system were evaluated when patients had clinically recovered from CMA. The results of different measurements were correlated with the patients' clinical response to c ow's milk challenge. The prechallenge suppressor activity was found to be low in patients with challenge-proven CMA when compared with those clinically negative to oral cow's milk challenge but had normalized a fter a 4-18 month milk-elimination period in patients who had recovere d from CMA. IFN-gamma generation was low in patients with active CMA b ut had clearly enhanced in patients recovering from CMA. The serum con centration of ECP increased significantly during oral cow's milk chall enge in patients with cutaneously manifested CMA. Measured by the ELIS POT method, the patients with active CMA mounted a high, non-antigen-s pecific immune response but were unable to direct the antigen-specific response, especially in the IgA class. After a follow-up of a mean 13 .5 months on cow's milk elimination diet, the immune response to cow's milk antigens had developed in patients who had recovered from CMA. T he development in the capacity to mount an adequate immune response to specific protein antigens, especially in the IgA class, can be interp reted as deriving from the development in T-lymphocyte regulation. A s trong connection is also envisaged between adequate T-cell regulation, cytokine production and normal isotype-switching to IgA.