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Korean Journal of Reproductive Medicine 2008;35(2):119-129.
Published online June 1, 2008.
Expression of Decidual Natural Killer (NK) Cells in Women of Recurrent Abortion with Increased Peripheral NK Cells.
Myeong Jin Yeon, Kwang Moon Yang, Chan Woo Park, In Ok Song, Inn Soo Kang, Sung Ran Hong, Dong Hee Cho, Yong Kyoon Cho
1Lin Women's Hospital, Seoul, Korea.
2Department of Obstetrics and Gynecology, Cheil General Hospital & Women's Healthcare Center, Kwandong University, College of Medicine, Seoul, Korea.
3Department of Pathology, Cheil General Hospital & Women's Healthcare Center, Kwandong University, College of Medicine, Seoul, Korea.
4Department of Clinical Pathology, Cheil General Hospital & Women's Healthcare Center, Kwandong University, College of Medicine, Seoul, Korea.
5Department of Obstetrics and Gynecology, Inje University, Sanggye Paik Hospital, Seoul, Korea.
Abstract
OBJECTIVE
The purpose of this study was to quantify decidual CD56+ and CD16+ NK cell subtype population and to evaluate the correlation between decidual NK cell expression and peripheral CD56+ NK cell expression in women with a history of recurrent abortion and increased peripheral NK cells. METHODS: Twenty-nine women with recurrent abortion and elevated peripheral CD56+ NK cell percentage who had chromosomally normal conceptus were included in this study. Thirty-two women with recurrent abortion who had chromosomally abnormal conceptus were used as controls. Distribution of CD56+ and CD16+ NK cells in decidual tissues including implantation sites was examined by immunohistochemical staining. The degree of immunohistochemical staining was interpreted by score and percentage. RESULTS: There was a significant difference in decidual CD56+ NK cell score (43.6+/-24.5 vs. 23.9+/-16.3 P =0.001) and CD56+ NK cell percentage (42.1+/-11.7 vs. 33.9+/-15.8 P =0.027) between increased peripheral NK cell group and control group. However, there was no statistically significant difference in decidual CD16+ NK cell score (18.7+/-9.5 vs. 13.2+/-39.4 P =0.108) and CD16+ NK cell percentage (24.7+/-5.9 vs. 23.4+/-11.7 P =0.599). There was no significant correlation between decidual NK cell score and peripheral NK cell percentage in increase peripheral NK cell group (peripheral CD56+ NK cell percentage vs. decidual CD56+ NK cell score, r=-0.016, P =0.932, peripheral CD16+ NK cell percentage vs. decidual CD16+ NK cell score, r=0.008, P =0.968). CONCLUSION: This study shows that CD56+ decidual NK cells are increased in decidua of women exhibiting a history of recurrent abortion with increased CD56+ peripheral NK cell. There was no significant correlation between decidual and peripheral NK cell increment in increase peripheral NK cell group. This study suggests the possibility that decidual NK cells may play an important role in the immune mechanism of recurrent abortion.
Key Words: Decidual natural killer cell; CD56+/CD16+ NK cell; Recurrent abortion


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