Transcriptome profiling of purified human trophoblast cells

Transcriptome profiling of purified human trophoblast cells

108 Abstracts / Placenta 46 (2016) 102e121 downregulated in PF and P groups as compared with C group, and the expression levels were considerably lo...

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108

Abstracts / Placenta 46 (2016) 102e121

downregulated in PF and P groups as compared with C group, and the expression levels were considerably low in PF group. In F group, Notch1 receptor expression was upregulated compared with C group, expressions of DLL4 and Jagged2 were almost the same extent as those in C group, and expressions of the other factors were downregulated. Conclusions: All receptors and ligands were downregulated in PE placentas. In FGR placentas, although most factors were downregulated, DLL4 and Jagged1 ligands were not downregulated, and Notch1 receptor was upregulated. This result suggests that these factors might play an important role for differences between PE and FGR pathogenesis.

THE ABSENCE OF CX3CR1 IMPAIRS INFLAMMATION-INDUCED PRETERM LABOR THROUGH THE REDUCTION OF MACROPHAGE RECRUITMENT Tamaki Yahata 1, Sakiko Nanjo 1, Madoka Mika Mizoguchi 1, 1 1 Yamamoto , Aya Kobayashi , Mizuho Nosaka 2, Yuko Ishida 2, Yumi Kuninaka 2, Akihiko Kimura 2, Sawako Minami 1, Naofumi Mukaida 3, Toshikazu Kondo 2, Kazuhiko Ino 1. 1 Department of Obstetrics and Gynecology, Wakayama Medical University, Japan; 2 Department of Forensic Medicine, Wakayama Medical University, Japan; 3 Division of Molecular Bioregulation, Kanazawa University Cancer Research Institute, Japan Objective: The premature activation of inflammatory mediators is one of the major causes in preterm labor (PTL). Cytokines and chemokines are involved in pathophysiological processes of preterm labor. Thus, we explored the pathological roles of CX3CL1 (fractalkine) and its receptor CX3CR1 in PTL using Cx3cr1-/-(KO) mice. Methods: In this study, we employed a murine model of LPS-induced PTL. Briefly, pregnant C57Bl/6 (WT) and KO mice were injected i.p. 25mg LPS at Gd 15.5 days and observed until labor followed by the evaluation of PTL rate. Moreover, gestational tissues (amnion, placenta and uterus) and serum were collected at 6 hrs after LPS injection. By immunohistochemical and RT-PCR analyses the rate of PTL, count of immune cells, and inflammatory cytokines and chemokines were compared. Results: In pregnant WT mice treated with LPS, serum CX3CL1 levels were significantly increased at 6 hrs, and CX3CL1 protein could be immunohistochemically detected in amnion and labyrinth zone of placenta. Upon LPS injection, CX3CR1+ macrophages were recruited in decidua. When both WT and KO mice were administered LPS, WT mice showed PTL rate of over 80% whereas the rate was significantly reduced in KO mi ce, compared with WT ones. Immunohistochemically, the recruitment of macrophage recruitment in decidua was significantly alleviated in KO mice, compared with WT ones. However, there were significant differences in the recruitment of T cells and NK cells between both strain mice. The gene expression of inflammatory cytokines and chemokines (Il1b, Il6, Ifng, Tnfa, and Ccl2) in uterus and placenta was significantly attenuated in KO mice, compared with WT one. Double-color immunofluorescence analyses revealed that these molecules were expressed on F4/80+ macrophages. Conclusions: Collectively, these observations suggested that CX3CL1CX3CR1 axis would played detrimental roles in LPS-induced PTL through macrophage recruitment and eventually inflammatory cytokine production. Thus, CX3CL1- CX3CR1 systems might be a therapeutic target of PTL.

A NOVEL AUTOANTIBODY MISCARRIAGE

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Kenji Tanimura 1, 2, Masashi Deguchi 1, Mayumi Morizane 1, Yasuhiko Ebina 1, Hisashi Arase 2, Hideto Yamada 1. 1 Department of Obstetrics and Gynecology, Kobe University Graduate School of Medicine, Japan; 2 Department of Immunochemistry, Research Institute for Microbial Disease, Osaka University, Japan Objective: We have found that autoantibodies against b2-glycoprotein I/ HLA class II complexes (anti-b2GPI/HLA-II) are involved in the pathogenesis of antiphospholipid syndrome. On the other hand, it was reported that about 65% of the Japanese women with recurrent miscarriage (RM) had no

apparent risk factors for RM. We investigated whether anti-b2GPI/HLA-II is associated with RM. Patients and Methods: One hundred and nine women with RM consecutively seen in Kobe University Hospital from November 2014 to May 2016 were enrolled, and serum titers of anti-b2GPI/HLA- DR7 were measured with informed consent. We investigated the relation between anti-b2GPI/ HLA-DR7 titers and the clinical background of RM women. Results: Thirteen of the 109 women with RM (12%) had positive results for antiphospholipid antibodies (aPL), whereas 55 of them (50%) had no apparent risk factors for RM. The median [range] number of spontaneous abortion (SA) or stillbirth in the all participants was 3times [2-18], and that of anti-b2GPI/HLA-DR7 titers in them was 5.0U [0-569.8]. The number of RM women with anti-b2GPI/HLA-DR7 titers of S5U, S10U, and S20U were 56 (51%), 29 (27%), and 13 (12%), respectively. There was no significant difference between the RM women who had no apparent risk factors for RM (n¼55) and those who had some risk factors for RM (n¼54) in anti-b2GPI/HLA-DR7 titers (4.8U [0-569.8] vs 5.1U [0-332.2]; p¼0.88). Furthermore, twelve women had anti-b2GPI/HLA-DR7 titers of S20U, and 6 of them had severe clinical manifestations, three had one or more stillbirths beyond 22 weeks of gestation (GW), two had consecutive 5 RM, and one had both histories of SA beyond 10 GW and stillbirth beyond 22 GW and acute myocardial infarction. Conclusion: Anti-b2GPI/HLA-II might be one of the independent risk factors for RM.

PREDICTION OF ADHERENT PLACENTA WITH PLACENTA PREVIA USING A NOVEL SCORING SYSTEM Ryosuke Takahashi, Kenji Tanimura, Masashi Deguchi, Mayumi Morizane, Hideto Yamada. Department of Obstetrics and Gynecology, Kobe University Graduate School of Medicine, Japan Objective: Adherent placenta (AP) is a life-threatening condition, and is often complicated with placenta previa (PP). We have devised an original scoring system for predicting AP complicated with PP, and conducted a prospective cohort study to evaluate the diagnostic accuracy of our scoring system (Placenta Previa with Adherent Placenta score: PPAP score). Methods: PPAP score is composed of the following two components; 1) past history of previous cesarean section, dilation and curettage, or other uterine surgery; and 2) imaging findings of ultrasonography and MRI. Each item is graded either 0, 1, 2, or 4 points, and then added up to yield a number between 0 and 24. From January 2011, we have used the PPAP scoring system for predicting AP complicated by PP. If patients with PP had score 8 or more, we suspected them to have AP, and the patients received preoperative internal iliac artery occlusion balloon catheters placement. The diagnostic accuracy of PPAP score were estimated. This study was approved by the institutional ethic boards. The informed consent was obtained from all patients. Results: This prospective cohort study included 147 pregnant women with PP who were managed at Kobe University Hospital from January 2011 to February 2016. Twenty of them had PPAP score 8 or more. Seventeen of the 20 actually had AP. However, two women with AP were overlooked at cutoff of 8. PPAP score yielded 90% sensitivity, 98% specificity, 85% positive predictive value, 98% negative predictive value, and 97% accuracy. Conclusion: This prospective cohort study demonstrated that a novel scoring system might be useful for identifying patients at a high risk for AP complicated by PP.

TRANSCRIPTOME PROFILING OF PURIFIED HUMAN TROPHOBLAST CELLS Hirotaka Hamada 1, Hiroaki Okae 2, Nobuo Yaegashi 1, Takahiro Arima 2. 1 Tohoku University Hospital, Departments of Obstetrics and Gynecology, Japan; 2 Department of Informative Genetics, Environment and

Abstracts / Placenta 46 (2016) 102e121

Genome Research Center, Tohoku University Graduate School of Medicine, Japan Trophoblast cells in the human placenta are classified into three main types: cytotrophoblast cells (CTs), syncytiotrophoblast cells (STs) and extravillous cytotrophoblast cells (EVTs). CTs are stem/progenitor cells of STs and EVTs. STs play roles in hormone production and the exchange of nutrients and gases and EVTs invade the maternal decidua and remodel uterine spiral arteries to ensure sufficient blood supply to the fetus. It is not fully understood how the proliferation and differentiation of trophoblast cells are regulated in vivo. In this study, we performed transcriptome profiling of uncultured CTs, STs and EVTs, using RNA- sequencing technology. We found that expression levels of more than 1000 genes dramatically changed (> 10-fold increase or decrease) during differentiation of CTs to EVTs or STs. In STs, genes encoding hormones and other pregnancy- specific secretory proteins were strongly induced and genes regulating the cell cycle were downregulated, suggesting that STs are highly specialized cells for the production of secretory proteins. In EVTs, immune-related genes such as chemokines and the human leukocyte antigens were significantly induced, which might be important for the migration of EVTs and their interaction with the maternal immune system. We also identified 100 genes specifically expressed in CTs, some of which are known to be essential for the maintenance of mouse trophoblast stem cells or labyrinth trophoblast progenitor cells. Furthermore, we found hundreds of exon-skipping events differentially regulated among trophoblast cells. These data will increase our understanding of normal placental development and t he pathogenesis of pregnancy complications.

VASA PREVIA PRENATALLY DIAGNOSED BY ULTRASOUND SCANNING AND MAGNETIC RESONANCE IMAGING; REPORT OF 3 CASES Erika Tanaka 1, Mayumi Morizane 1, Mihoko Uchiyama 1, Masashi Deguchi 1, Utaru Tanaka 2, Tetsuo Maeda 2, Hideto Yamada 1. 1 Department of Obstetrics and Gynecology, Kobe University Graduate School of Medicine, Japan; 2 Department of Radiology, Kobe University Graduate School of Medicine, Japan Vasa previa is a rare complication which occurs when fetal blood vessels unsupported by Wharton’s jelly within the umbilical cord run over the internal cervical os. Vasa previa is associated with a high fetal mortality rate caused by the rupture of fetal blood vessels at the time of membrane rupture or labor if it is not diagnosed prenatally. We report 3 cases diagnosed with vasa previa prenatally. Case 1: A 34-year-old multiparous woman was hospitalized for the management of vasa previa with preterm contraction from 30 gestational weeks (GW). Magnetic resonance imaging (MRI) at 30 GW showed the fetal blood vessel in close proximity to the internal os, and another vessel running longitudinally along anterior lower uterine segment from the caudal side of placenta. Emergency cesarean section was performed when labor started at 36 GW. Case 2: A 36-year-old primiparous woman conceived by in vitro fertilization. She was diagnosed with vasa previa by transvaginal ultrasonography. MRI at 35 GW also showed that the vessels in the amniotic membrane extended over the fetal head. Planned cesarean section was performed at 36 GW. Case 3: A 34-year-old 1-parous woman conceived by in vitro fertilization. She was diagnosed with low-lying placenta at 30 GW. Velamentous cord insertion and fetal vessels running from the edge of the placenta to the internal os along with the posterior wall of the uterus were observed by ultrasonography and MRI. She was hospitalized for prophylactic management from 31 GW. Emergency cesarean section was performed when labor started at 35 GW. In all cases, macroscopic finding of vascular distribution was consistent with the finding of ultrasonography and MRI. In addition to ultrasonography, MRI is useful for the cases that require precise evaluation of vascular distribution to improve perinatal outcome of vasa previa.

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THE EFFECT OF ESTROGEN-PROGESTIN THERAPY FOR PERSISTENT BLEEDING WOMEN WITH RETAINED PRODUCTS OF CONCEPTION Munekage Yamaguchi, Tomoko Honda, Yoshinori Okamura, Ritsuo Honda, Takashi Ohba, Hidetaka Katabuchi. Department of Obstetrics and Gynecology, Faculty of Life Sciences, Kumamoto University, Japan Introduction: Retained products of conception (RPC) is one of the causes of persistent vaginal bleeding after abortion. Blood transfusion may be needed if the bleeding is beyond control; however, there is still no consensus on the appropriate treatment for RPC. The aim of the present study is to investigate the efficacy of estrogen-progestin therapy (EPT) for persistent bleeding women with RPC following abortion. Methods: We retrospectively reviewed 12 patients diagnosed with RPC following abortion initially treated with EPT at Kumamoto University Hospital between July 2013 and June 2016. Women with positive serum hCG levels who complained of persistent genital bleeding after abortion were diagnosed as RPC when ultrasound examinations showed space occupying lesion with color flow by a Doppler imaging in the uterine cavity. Results: The median age of the patients was 30 years old (20-43 years old). The median gestational age at abortion was 10w2d (6w0d-19w3d), and the median duration from the abortion to the initial visit was 55.5 days (21-80 days). The median serum hCG level at the initial visit was 10.4 mIU/ml (0.6183.4 mIU/ml). Genital bleeding disappeared after withdrawal bleeding induced by the first EPT in all 12 patients. Space occupying lesion and blood flow in the uterine cavity resolved in 10 patients after the first EPT, in 1 patient after the second EPT, and in 1 patient whose serum hCG level was maximum after the third EPT. The hCG concentration fell below the normal limit 17.5 days (9-84 days) after the initial EPT. No additional treatments were necessary in all 12 patients. Conclusion: Vaginal bleeding disappeared and retained products in the uterus were conservatively evacuated without the need for additional treatments in all patients treated with EPT, suggesting that EPT is effective for persistent bleeding women with RPC following abortion.

ATHEROSIS OF THE SPIRAL ARTERIES IN ACUTE FATTY LIVER OF PREGNANCY: A CASE REPORT Rika Zen 1, Shunichiro Tsuji 1, Suzuko Moritani 2, Kazutaka Yamada 1, Kaori Hayashi 1, Daisuke Katsura 1, Tetsuo Ono 1, Akiko Ishiko 1, Kentaro Takahashi 3, Takashi Murakami 1. 1 Department of Obstetrics and Gynecology, Shiga University of Medical Science, Japan; 2 Division of Diagnostic Pathology, Shiga University of Medical Science, Japan; 3 Perinatal Center, Shiga University of Medical Science, Japan Introduction: Acute fatty liver of pregnancy (AFLP) has an incidence of 1 in 13,000 deliveries and comprises clinical findings such as preeclampsia and HELLP syndrome. Occasionally in AFLP, the prognosis is poor for the mother and fetus. The pathophysiology of AFLP is not completely understood; however, in the last decade, some reports have suggested that mitochondrial dysfunction related to the beta- oxidation of fatty acids may cause AFLP. We report a case of clinical AFLP with histopathological findings of acute atherosis in the decidua of the placenta. Case: A 28-year-old primipara woman with natural pregnancy was diagnosed with monochorionic diamniotic twin at a nearby private clinic. She was referred to our hospital for the perinatal management of monochorionic diamniotic twin and was admitted at 24 weeks for threatened premature delivery. The laboratory examinations at 34 weeks revealed a platelet count of 189103/mm3, serum AST of 383 U/l, serum ALT of 402 U/ l, and antithrombin-Ⅲ 28%. Subsequently, an emergency cesarean section was performed following the diagnosis of AFLP. However, the patient’s blood pressure was within normal range throughout the perinatal period. Histopathological examinations revealed acute atherosis of the uterine spinal arteries with fibrinoid necrosis in the decidua of the placenta.