Trophoblast cell influence on peripheral blood natural killer cell proliferation and phenotype in non-pregnant women and women in early pregnancy.

Abstract:

:Natural killer (NK) cells are the main population of leukocytes in decidua during the first trimester of pregnancy. NK cells can have contact with trophoblast cells during pregnancy, which raises the possibility of mutual influence. This research aimed to evaluate the proliferation and phenotype of peripheral blood NK cells in the presence of trophoblast cells of the JEG-3 cell line. We showed that trophoblast cells of the JEG-3 cell line (American Type Culture Collection (ATCC), USA) produced TGFβ. However, co-culturing of NK and trophoblast cells did not change the SMAD2/3 to pSMAD2/3 ratio within NK cells. These data indicate that the canonical signaling pathway from TGFβ is not activated, but do not preclude activation of SMAD-independent signaling pathways through the effect of TGFβ and/or other cytokines. We established that trophoblast cells inhibited both constitutive and IL-2-induced expression of Ki-67 proliferation marker by NK cells in vitro in both pregnant and non-pregnant women. Constitutive and induced Ki-67 expression by peripheral blood NK cells was increased in pregnant women compared with non-pregnant women. The influence of trophoblast cells on Ki-67 expression by NK cells was more pronounced in the presence of other mononuclear cells than in their absence. In the presence of trophoblast cells and IL-2, the number of NK cells with the CD16+CD57- phenotype in peripheral blood mononuclear cells (PBMCs) was increased in pregnant and non-pregnant women, compared with culturing with IL-2 only. This might reflect a decrease in the number of NK cells at the terminal stage of differentiation. We also revealed the increased content of NK cells with the CD16-CD56bright phenotype in PBMCs of pregnant women when incubated with trophoblast cells and IL-2, compared with culturing with trophoblast cells only. Our results suggest that NK cells need contact interactions with trophoblast cells and additional cytokine stimulation (IL-2, cytokines of other mononuclear cells) to acquire the CD56bright phenotype.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Mikhailova VA,Kudryavtsev IV,Serebryakova MK,Milyutina YP,Demidova ES,Panina AN,Bazhenov DO,Belikova ME,Selkov SA,Sokolov DI

doi

10.1016/j.imbio.2020.151910

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

151910

issue

3

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(19)30383-3

journal_volume

225

pub_type

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