[No authors listed]
We have previously shown that interferon gamma (IFN-γ) induces aberrant CD49b(+) natural killer (NK) cell recruitment by regulating CX3CL1 and eventually provokes foetal loss. In this study, we show that IFN-γ also modulates Ly-49 receptors on NK cells during pregnancy failure. The percentages of Ly-49A(+) and Ly-49G2(+) NK cells in the uteri of the IFN-γ-treated group were significantly lower than those observed in the control group. Moreover, the median fluorescence intensity (MFI) values of Ly-49A and Ly-49G2 expression on NK cells in the uteri of the IFN-γ-treated group were significantly lower than those of the control group. Using isolated spleen leucocytes, we further found that IFN-γ significantly reduced the percentage of Ly-49A(+) NK cells in vitro. However, CX3CL1 was not involved in the modulation of Ly-49 receptors, and the expression of CX3CR1 was not regulated by IFN-γ in spleen leucocytes. Collectively, our data indicate that IFN-γ can modulate Ly-49 receptors on NK cells and this process may play a role in IFN-γ-induced pregnancy failure. Thus, we provide a new line of evidence correlating the deleterious effects of IFN-γ with its role in regulating NK cell Ly-49 receptors during pregnancy failure.
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