Modulation of the Interleukin 2 Receptor by Maternal and Cord Blood Serum

In this report, the potential inhibitive action, of maternal serum (retroplacental and peripheral), and cord blood serum on the expression of the I12r has been studied. Calf and male serum were used as a control. In order to have an optimal I12r expression, a previous PHA cellular stimulation was performed. the maternal serum's I12r inhibitive property was measured during and after the pregnant period. the presence of I12r on maternal lymphocytes, cord blood cells, and unrelated donor mononuclear cells has been investigated (after a PtfA stimulation assay). the down regulated Il2r expression of neoplastic cell line (Hut7g cell line) under the influence of maternal serum has been observed. the examination of the inhibitive action due to maternal serum has suggested that a factor included in the IgG fraction is mainly responsible for the down regulating property concerning the 112r expression. A possible mechanism for the action of this factor has been studied. Further experiments suggest that the addition of recombinant I12 during the action of low doses of maternal IqG allows a partial reexpression of the I12 receptor. However, at. physiological concentrations of IyC, thc Interleukin 2 receptor down regulation becomes Irreversible.