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[Comparative analysis of CD56 lymphocytes and CD69 antigen expression in endometrium during decidualization]
Marta Zabińska-Popiela1, Lukasz Wicherek, Krystyna Gałazka
1Klinika Endokrynologii Ginekologicznej, Collegium Medicum, Uniwersytetu Jagiellońskiego w Krakowie.
Insights
Decidualization involves changes in immune cells, with more CD56 positive cells found after abortion. CD69 antigen expression increased during the secretory phase and after abortion, suggesting activated immune cells aid early pregnancy.
Area of Science:
- Immunology
- Reproductive Biology
- Gynecology
Background:
- The endometrium uniquely regulates immune cells based on menstrual cycle phase.
- Understanding these immune cell dynamics is crucial for reproductive health.
Purpose of the Study:
- To compare CD56 positive cell counts and CD69 antigen expression in the endometrium during different menstrual cycle phases and after spontaneous abortion.
- To investigate immune cell activity during decidualization.
Main Methods:
- Immunohistochemistry was used to analyze CD56 and CD69 expression.
- Samples included 38 endometrial tissues across menstrual cycle phases and 20 decidual tissues post-spontaneous abortion.
Main Results:
- CD56 positive cells were higher in the mid-secretory phase and significantly lower in the endometrium compared to post-abortion decidua.
- CD69 antigen expression increased from the early secretory phase, remaining high during the secretory phase and post-abortion.
Conclusions:
- Differences in CD56 cell numbers during decidualization, without altered CD69 expression, suggest activated mononuclear cells are vital for early pregnancy development.
- These findings highlight the role of immune cell modulation in successful implantation.
Introduction:
The exceptionality of endometrium, differentiating it from other epithelial tissues is related with its ability to regulate the number and activity of infiltrating immunological cells according to menstrual cycle phases. The aim of this study was a comparative evaluation of the number of CD56 positive cells, as well the analysis of CD69 antigen expression during decidualization.
Materials And Methods:
The expression of CD56 and CD69 antigens was analyzed using the immunohistochemistry method in 20 decidual tissue samples derived after curettage following spontaneous abortion and in 38 endometrial tissue samples obtained during hysterectomy performed because of benign myoma diagnosis. The endometrial tissue samples were divided regarding to the menstrual cycle phases. Following phases were distinguished: early proliferative, mid-proliferative, late proliferative, early secretory, mid secretory and late secretory.
Results:
The higher CD56 positive cells were recognized in the endometrium during mid secretory cycle phase. The number of CD56 positive cells was significantly lower in endometrium, independent of menstrual cycle phase in comparison to endometrium following abortion. The expression of CD69 antigen was observed to increase beginning with early secretory cycle phase and remained at high level during the secretory cycle phase and the abortion.
Conclusions:
The observed differences in the number of CD56 positive cells during decidualization without the changes in immune cells activity evaluated using CD69 antigen expression may indicate the participation of activated mononuclear cells in the normal development of pregnancy beginning with implantation.
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