[Phagocytosis during mitotic and endomitotic chromosome replication in the trophoblast of the grey vole].

Phagocytosis was studied in three populations of trophoblast cells of the grey vole: primary and secondary giant cells, and spongiotrophoblast. In the two former, the cell growth is accomplished by endomitotic polyploidization only, whereas the spongiotrophoblast cells divide mitotically for a long time. The phagocytosis of these differs from that in giant cells. No more than 1--2 erythrocytes were phagocyted by the spongioblast diploid cells, while giant cells were able to phagocyte over several dozens of erythrocytes. The spongioblast cells are haemophagous and phagocyte only anucleate blood cells -- erythrocytes; unlike, giant cells, when ingrowing within the uterus mucose, are capable of taking up and digesting, in addition to erythrocytes, leukocytes, decidual and endothelial cells.