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(1) Background: Prior studies suggested a significant impact of previous live births on peripheral natural killer cells (pNK) in patients with recurrent pregnancy loss (RPL). Patients with primary RPL (pRPL, no live birth) showed higher numbers of pNK than secondary RPL patients (sRPL, ≥ 1 live birth). (2) Methods: To further determine immunological differences between RPL patients and controls, we analysed pNK subpopulations and activation markers in pRPL ( n  = 47), sRPL ( n  = 24) and controls with previous live birth (sCtrl,  n  = 25) and nullipara (pCtrl,  n  = 60) within a prospective study. Percentages and numbers of CD56 dim CD16 bright  cells, subpopulations and activation markers (CD57+, CD62L+, NKG2D+, NKp46+) were measured in non-pregnant RPL patients and  n  = 85 controls ( n  = 60 pCtrl,  n  = 25 sCtrl) in the mid-luteal phase by flow cytometry. (3) Results: Compared to sRPL patients, sCtrls showed higher CD56 +  and CD56 dim CD16 bright  numbers. Further, sRPL patients showed lower numbers of CD56 dim CD16 bright NKG2D +  and CD56 dim CD16 bright NKp46 +  than sCtrls. (4) Conclusion: We suggest a chronic immune stimulation leading to a lower NK-cell count in sRPL patients with a lower NK cytotoxicity. This underlines the necessity to investigate pNK subpopulations as well as pRPL and sRPL separately to delineate the immune alterations in RPL.

Different Background: Natural Killer Cell Profiles in Secondary versus Primary Recurrent Pregnancy Loss