ARTICLE INFO

Article Type

Original Research

Authors

Roumandeh   N. (1)
Saremi   A.T. (2)
Sanaye Naderi   M. ()
Younesi ‎   B. (4)
Arasteh   J. (5)
Zare ‎   A. (*)






() Sarem Fertility & Infertility Research Center (SAFIR)‎, Sarem Women’s Hospital, Tehran, Iran
(*) ‎“Sarem Fertility & Infertility Research Center (SAFIR)” and “Sarem Cell Research Center (SCRC)” ‎, Shahid Beheshti Medical University, Tehran, Iran
(1) ‎”Sarem Cell Research Center (SCRC), Sarem Women’s Hospital, Tehran” and “Immunology Department‎, Medicine Faculty, Semnan University of Medical Sciences, Semnan‎, Iran
(2) ‎“Sarem Fertility & Infertility Research Center (SAFIR)” and “Sarem Cell Research Center (SCRC)” ‎, Sarem Women’s Hospital, Tehran, Iran
(4) Sarem Women’s Hospital, Tehran, Iran
(5) ‎Biology Department, Basic Sciences Faculty, Central Tehran Branch, Islamic Azad University, Tehran, Iran

Correspondence


Article History

Received:  February  9, 2017
Accepted:  June 27, 2017
ePublished:  August 15, 2018

BRIEF TEXT


Successful pregnancy occurs as a result of maintaining the immune system of the mother to the fetus. ‎Lack of maternal immunity system is associated with pregnancy problems and leads to abortion [1]. ‎Evidence suggests that recurrent spontaneous abortion (RSA) is associated with inflammatory ‎responses and immunological tolerance failure [2]. Three or more repeated abortions before the 20th ‎week of pregnancy, is called recurrent spontaneous abortion.‎

The cause of this disorder is unknown in many cases, but there are several factors that can be ‎attributed of which genetic abnormalities, hormonal disorders, abnormalities of the placenta and ‎uterus, infections, and immunological factors can be named [3]. Among the immunologic factors, ‎several mechanisms of environmental tolerance are involved in the preservation of the embryo, ‎including the presence of T-regulatory cells (Treg) in the decidua and peripheral blood tissue during ‎pregnancy [4]. On the other hand, the Th17 inflammatory cells secreting cytokine IL-17 are associated ‎with red allograft rejection and deletion of tolerance. There is a growing evidence that regulated T cells ‎and Th17 act as regulatory and executive cells in the establishment and maintenance of pregnancy, and ‎impairment in their number and function may lead to failure of implantation and abnormalities of ‎pregnancy [5]. During pregnancy, T-cells gradually increase in the first trimester and second trimester, ‎and then decrease in the third trimester of pregnancy and after delivery [4, 6]. ... [7-14].‎ ‎ Th17 cells are closely related to Treg cells and, based on the findings, Treg cells are negatively ‎associated with Th17 cells and serum IL-17 levels are positively related to Th17 cells and the ratio of ‎Th17 to Treg cells [14]. Therefore, regulatory T cells inhibit the expression of IL-17, and the inhibition ‎of Treg cells on Th17 cells may decrease in women with spontaneous abortion. In addition, it has been ‎observed that cytokines secreted from Th17 cause rejection of allograft during pregnancy, while Treg-‎secreted cytokines are involved in preserving the tolerance of the fetus and may be effective in ‎improving the outcome of pregnancy [14, 15]. In a study between fetal rejection and a reduction in the ‎frequency of Treg cells, association has been observed [16]. The imbalance of Th17 cells to Treg in ‎URSA is also involved [17].‎

Considering the role of cytokine balance in controlling the maternal immune response to embryo ‎antigens during pregnancy, the study of cytokines involved in this process is important. The aim of ‎this study was to evaluate the level of cytokines secreted from Th17 and T cells in patients with a ‎history of unknown recurrent spontaneous abortion (URSA) compared to healthy women.

This is a case-control study.

This research was conducted on two groups of patients referred to Sarem Hospital in Tehran.

The case group was 30 patients with a history of three or more recurrent spontaneous abortions. ‎Patients were included in the study after examining the status of karyotype, antiphospholipid ‎antibodies, anti cardiolipin, ANA, anti-thyroid antibodies, microbial infections (TORCH, HBV, HIV, ‎EBV, and CMV), anatomical abnormalities and hormonal disorders. Control subjects were 28 healthy ‎women without a history of abortion and had at least one surviving child. Prior to sampling, the ‎informed consent form approved by the Sarem Hospital's Ethics Committee was completed by each of ‎the volunteer patients.‎

From each of the subjects in two groups, 2 cc of blood was taken and serum samples were stored in a ‎freezer at -70 C for complete collection of the samples. To test the level of cytokines of Th17 cells ‎including IL-17 and IL-21 and Treg cytokines including IL-10 and TGF-β in serum samples, ELISA ‎technique was used with relevant kits (eBioscience, USA). Measuring the concentration of cytokines in ‎patients’ samples according to the kit instructions was done in binary form. The sensitivity of the ‎measurement kit for IL-17 and IL-21 cytokines was 8 and 0.01 Pico gram per milliliter respectively and ‎it was 2, and 156.3 Pico gram per milliliterfor IL-10 and TGF-β cytokines respectively. Data were analyzed using SPSS 22 software. Normal distribution of data was investigated using ‎Kolmogorov-Smirnov test. Non-parametric Mann-Whitney test was used to examine the significant ‎difference between the groups studied considering the abnormal distribution of IL-21, IL-10, IL-17 and ‎TGF-β data in the serum of patients and control group. Spearman correlation coefficient was used to ‎determine the correlation between serum IL-17 concentration and TGF-β concentration in patients.‎

The mean age in the patient group was 31.03 ± 5.32 and in the control group was 33.71 ± 5.054 years. ‎The concentration of IL-17 cytokines in serum samples was significantly higher in patients with URSA ‎than in the control group (p <0.001). Also, serum TGF-β levels were significantly lower in the patients ‎than in the control group (p = 0.001). Levels of IL-21 and IL-10 in the serum of patients were not ‎significantly different in comparison with healthy women (p = 0.08, p = 0.02, respectively; Table 1).‎In addition, serum IL-17 concentration was positively and significantly correlated with TGF-β ‎concentration in the patients (r = 0.554, p = 0.002, Figure 1).‎

‎... [18-21]. The results of this study showed a high level of IL-17 in serum of URSA patients compared ‎to the control group, but the level of IL-21 in both groups was not significantly different. In a study by ‎Sarshaki et al., It was also found that IL-17 levels in patients with this complication was higher ‎compared to the control group [17]. In the similar study, the expression of IL-17 and IL-21 gene was ‎investigated, based on which the expression of IL-17 gene in URSA patients had a higher level than ‎normal pregnant women, while IL-21 gene expression in these patients had no statistically significant ‎difference with the control group [22].‎ On the other hand, levels of TGF-β as a cytokine secreted from Treg cells showed a lower level in the ‎serum of patients than the control group, which shows the role of Treg cell in maintaining pregnancy ‎tolerance. In the present study, unlike most previous studies, there was no significant decrease in ‎serum IL-10 levels in patients compared with healthy women. Nevertheless, these findings are ‎consistent with the study by Yu et al., Which reported no significant differences in the level of IL-10 in ‎serum URSA patients compared to healthy women [23]. Therefore, during pregnancy, the Th17 ‎cytokine pattern may lead to fetal antigens and failure of the pregnancy's tolerance. Conversely, TGF-β ‎can be an effective factor in maintaining this tolerance and the success of pregnancy. In this study, serum levels of IL-17 in URSA patients had a positive and significant correlation with ‎TGF-β concentration in serum of these patients. Lee et al. also found that IL-17 + T cells in URSA ‎women increased significantly compared to normal pregnant women, and there was a positive ‎correlation between Th17 / Treg cell ratio and Th1 type cytokines [11].‎

Based on the results of this study and considering the role of pre-inflammatory cytokines of the Th17 ‎type and the regulatory role of TGF-β, these cytokines can be used as a factor in assessing or even ‎predicting the success or failure of pregnancy in URSA patients, which determines the significance of ‎the Th17/Treg equilibrium more than before. ‎



The level of IL-17 in women with a history of URSA is higher than that of healthy women and TGF-β ‎levels is lower than those of healthy women, suggesting that Th17-immunity type and immunity ‎regulation mediated by regularity T-cell are related to the pathogenesis of URSA.





The informed consent form approved by the morality committee of Sarem Hospital was completed by ‎each of the volunteer patients.



TABLES and CHARTS

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