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[The measurement of proportion and function of regulatory T cells in unexplained recurrent spontaneous abortion]
Yu-sheng Liu1, Shu-yun Zhao, Jing-juan Ji
1Reproductive Medicine Center Provincial Hospital, Affiliated to Anhui Medical University, Hefei 230001, China.
Insights
Unexplained recurrent spontaneous abortion (URSA) is linked to lower levels and reduced function of CD4(+)CD25(+) regulatory T cells (Tr). This suggests a potential role for these immune cells in URSA.
Area of Science:
- Immunology
- Reproductive Medicine
- Cell Biology
Background:
- Unexplained recurrent spontaneous abortion (URSA) affects a significant number of women, with the underlying causes often remaining unclear.
- Regulatory T cells (Tregs), specifically CD4(+)CD25(+) Tr cells, play a crucial role in maintaining immune tolerance and preventing autoimmune responses.
- Dysregulation of immune cells, including Tregs, is increasingly implicated in pregnancy complications.
Purpose of the Study:
- To quantify the proportion of CD4(+)CD25(+) regulatory T cells (Tr) in women experiencing unexplained recurrent spontaneous abortion (URSA).
- To evaluate the functional capacity of CD4(+)CD25(+) Tr cells in women with URSA.
- To compare these parameters between URSA patients, normal non-pregnant women, and normal pregnant women.
Main Methods:
- Peripheral blood samples were collected from 15 URSA women, 15 normal non-pregnant women, and 13 normal pregnant women.
- The proportion of CD4(+)CD25(+) Tr cells was determined using double-label flow cytometry.
- The suppressive function of CD4(+)CD25(+) Tr cells was assessed in vitro by co-culturing them with CD4(+)CD25(-) T cells, measuring growth inhibition.
Main Results:
- Women with URSA exhibited a significantly lower proportion of CD4(+)CD25(+) Tr cells compared to both normal non-pregnant (10.8%) and normal pregnant women (11.2%).
- The suppressive function of CD4(+)CD25(+) Tr cells was also significantly impaired in URSA patients, with a lower suppressive rate (75%) compared to controls (89% and 90%).
- No significant differences in the proportion or function of CD4(+)CD25(+) Tr cells were observed between normal non-pregnant and normal pregnant women.
Conclusions:
- A reduced proportion and impaired function of CD4(+)CD25(+) regulatory T cells (Tr) are associated with unexplained recurrent spontaneous abortion (URSA).
- These findings suggest a potential immunoregulatory defect contributing to the pathophysiology of URSA.
- Further research into Treg-mediated immune mechanisms may offer new therapeutic targets for managing URSA.
Objective:
To investigate the proportion and function of CD(4)(+)CD(25)(+) regulatory T cells (CD(4)(+)CD(25)(+) Tr) in unexplained recurrent spontaneous abortion (URSA).
Methods:
(1) Proportion measurement: the proportion of CD(4)(+)CD(25)(+) Tr cells in peripheral blood was measured by double-label flow cytometric analysis. The samples were taken from 15 URSA women, 15 normal non-pregnancy women and 13 normal pregnancy women. (2) Function measurement: CD(4)(+)CD(25)(+) Tr cells and CD(4)(+)CD(25)(-) T cells were extracted from peripheral blood lymphocytes by the microbeads separation. The purity of CD(4)(+)CD(25)(+) Tr cells and CD(4)(+)CD(25)(-) T cells was measured by flow cytometry. The growth inhibitory effect of CD(4)(+)CD(25)(+) Tr cells on CD(4)(+)CD(25)(-) T cells was assessed in vitro.
Results:
The proportion of CD(4)(+)CD(25)(+) Tr cells was decreased significantly in URSA women (6.9 +/- 1.8)% than that in normal non-pregnancy women [(10.8 +/- 1.1)%] (P<0.05) and normal pregnancy women [(11.2 +/- 1.4)%] (P<0.01). Moreover, the suppressive rate of CD(4)(+)CD(25)(+) Tr cells was decreased significantly in URSA women (75 +/- 6)% than that in normal non-pregnancy women [(89 +/- 4)%] (P<0.05) and normal pregnancy women [(90 +/- 4)%] (P<0.01). However, with respect to the proportion and function of CD(4)(+)CD(25)(+) Tr cells, there was no significant difference between normal non-pregnancy women and normal pregnancy women (P > 0.05).
Conclusion:
The results suggest that decrease in proportion and function of CD(4)(+)CD(25)(+) Tr cells may be associated with URSA.
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