Abstract
The review article examines some etiological features of spontaneous abortions. There are many mechanisms of this pathology, and the article presents some of them: a shift in the balance of decidual natural killer cells (dNK), natural killer T (NKT) cells, regulatory T cells (Tregs), monocytes, macrophages, lymphocytes, and dendritic cells at the fetal-maternal border. There are several pathologies associated with Tregs: expression of soluble Tim-3, imbalance between Th1/Th2 cells and Th17/Tregs at different stages of pregnancy. Spontaneous abortions are associated with defects in fetal sHLA class I, which affect placental vessels and maternal immune cells through dNK and INF-γ, as well as defects in decidual cells, which are precursors of immune cells at the fetal-maternal border. The B7‑H4 protein, a regulator of T cell activity, also plays an important role. In addition, some researchers have noted the presence of immune reactions against the Y chromosome of the fetus. Poorly studied mechanisms of spontaneous abortions are defective LIF and CD95/CD95 ligand system.
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