[Comparison of the action of the sera of pregnant women and of trophoblastic beta 1-glycoprotein in a number of immunological tests].

The effects of blood sera of pregnant women in the I, II and III trimesters (SPWI, SPWII, SPWIII) were compared with those of purified preparations of trophoblastic beta 1-glycoproteid (TBG) on phytohemagglutinin (PHA) induced proliferative response of lymphocytes of the intact donors and on the production of a factor inhibiting the migration of leucocytes (FIM-L). SPWI and purified TBG preparations in doses corresponding to its level in SPWI were shown to produce similar effects. With the increase of TBG concentration, however, the inhibiting effect of its preparations on the proliferation of lymphocytes increased much more intensively than that of SPWII and SPWIII containing the same dose of this protein. The stimulating effect of TBG on the production of FIM-L increased with the dose as well while SPWII and SPWIII did not exert any effect on the migration of leucocytes. A suggestion is put forward that SPWII and SPWIII contain factors modifying the effect of TBG.