1
|
Jiang M, Huang L, Wang Y, Wang Y, Kang Q, Chen C, Hu Y, Li J, Wang T. Yueliang Yin Ameliorates Endometrial Receptivity in Mice with Embryo Implantation Failure by Reducing Pyroptosis and Activating BDNF/TrkB Pathway. Mol Nutr Food Res 2023; 67:e2300339. [PMID: 37797178 DOI: 10.1002/mnfr.202300339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/16/2023] [Indexed: 10/07/2023]
Abstract
SCOPE Endometrial receptivity plays a vital role in embryonic implantation. Yueliang Yin is a marketed solid drink in China, also known as Bushen Cuyun Recipe (BCR), that is, assumed to have a therapeutic effect on infertility by improving endometrial receptivity. This study investigates the effects and mechanisms of BCR in protecting the endometrium. METHODS AND RESULTS Mice with mifepristone-induced embryo implantation failure that exhibited a decreased implantation sites number, thinner endometrium, reduced endometrial glands number, and poor pinopode expression levels are treated with BCR, and these mentioned conditions significantly improves afterward. Molecular docking shows that the main active components kaempferol, quercetin, and hesperetin of BCR stably bound to gasdermin D (GSDMD). Experimental results demonstrate that levels of GSDMD, cleaved caspase-1 and leucine-rich repeat, and pyrin domain-containing 3 and IL-1β levels in model mice are significantly decreased and expressions of brain-derived neurotrophic factor (BDNF) and tyrosine protein kinase B (TrkB) expression levels are significantly elevated after BCR treatments, and that the DNA damage is significantly reversed in BCR-treated mice. CONCLUSIONS BCR is potent and effective in ameliorating endometrial receptivity. The potential mechanisms of BCR on endometrial receptivity may mediate by activating BDNF/TrkB pathway activation and protecting endometrial cells' protection against pyroptosis.
Collapse
Affiliation(s)
- Mei Jiang
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Ling Huang
- School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Yuxi Wang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Yao Wang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, 100029, China
- National Key Laboratory of Efficacy and Mechanism on Chinese Medicine for Metabolic Diseases, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Qianjun Kang
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Cong Chen
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Yujie Hu
- Ziqiang Vocational School of Shaanxi Province, Shaanxi Province, 721000, China
| | - Jialin Li
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Ting Wang
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 100029, China
| |
Collapse
|
2
|
Dong G, Sun R, Zhang R, Qin Y, Lu C, Wang X, Xia Y, Du G. Pre-implantation triclosan exposure alters uterine receptivity through affecting tight junction protein†. Biol Reprod 2022; 107:349-357. [PMID: 35554491 DOI: 10.1093/biolre/ioac092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 04/20/2022] [Accepted: 05/05/2022] [Indexed: 11/13/2022] Open
Abstract
Triclosan (TCS) is a broad-spectrum antibacterial agent and widely exists in environmental media and organisms. TCS exposure was reported to have adverse effects on reproduction including embryo implantation disorder. During the embryo implantation window, it is vital that the endometrium develops into a receptive state under the influence of ovarian hormones. However, the effect of TCS on embryo implantation and endometrial receptivity remains unclear. In current study, we found decreased embryo implantation rate, serum estrogen (E2) and progesterone (P4) levels in mice exposed to TCS from gestation day (GD) 0.5 to 5.5. Through RNA-seq, we identified nearly 800 differentially expressed genes (DEGs), which were enriched in pathways including uterus development, inflammatory response and immune system process. Among those enriched pathways, the tight junction pathway is essential for the establishment of receptive state of endometrium. Then, genes involved in tight junction pathway including Cldn7, Cldn10 and Crb3 were validated by RT-qPCR and the results were consistent with the RNA-seq. Through immunofluorescence staining and western blotting, we confirmed that the tight junction protein levels of CLDN7 and CRB3 were increased. All these findings suggest that pre-implantation TCS exposure reduces the rate of embryo implantation through up-regulating the expression of tight junction genes and affecting the receptivity of endometrium. Our data could be used to determine the sensitive time frame for TCS exposure and offer new strategy to prevent implantation failure.
Collapse
Affiliation(s)
- Guangzhu Dong
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Baijiahu Community Health Service Center, Moling Street, Jiangning District, Nanjing 211102, China
| | - Rundong Sun
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Rui Zhang
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Yufeng Qin
- Department of Microbes and Infection, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Chuncheng Lu
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Xinru Wang
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Yankai Xia
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Guizhen Du
- State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China.,Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| |
Collapse
|
3
|
Rahimipour M, Jafarabadi M, Salehnia M. In Vitro Implantation Model Using Human Endometrial SUSD2+ Mesenchymal Stem Cells and Myometrial Smooth Muscle Cells. CELL JOURNAL 2021; 23:154-163. [PMID: 34096216 PMCID: PMC8181319 DOI: 10.22074/cellj.2021.6979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 12/10/2019] [Indexed: 11/22/2022]
Abstract
Objective This study evaluated a novel in vitro implantation model using human endometrial mesenchymal stem cells
(EMSCs), SUSD2+, and myometrial smooth muscle cells (SMCs) that were co-cultured with mouse blastocysts as the
surrogate embryo.
Materials and Methods In this experimental study, SUSD2+ MSCs were isolated from human endometrial cell
suspensions (ECS) at the fourth passage by magnetic-activated cell sorting. The ECS and SUSD2+ cells were
separately co-cultured with human myometrial muscle cells for five days. After collection of mouse blastocysts, the
embryos were placed on top of the co-cultured cells for 48 hours. The interaction between the embryo and the cultured
cells was assessed morphologically at the histological and ultrastructural levels, and by expression profiles of genes
related to implantation.
Results Photomicrographs showed that trophoblastic cells grew around the embryonic cells and attached to theECS
and SUSD2+ cells. Ultrastructural observations revealed pinopode and microvilli-like structures on the surfaces of both
the ECS and SUSD2+ cells. Morphologically, the embryos developed to the egg-cylinder stage in both groups. Gene
expression analysis showed no significant differences between the two groups in the presence of an embryo, but an
increased expression of αV was detected in SUSD2+ cells compared to ECS cells in the absence of an embryo.
Conclusion This study showed that SUSD2+ cells co-cultured with SMCs could interact with mouse embryos. The
co-cultured cells could potentially be used as an implantation model.
Collapse
Affiliation(s)
- Marzieh Rahimipour
- Department of Anatomy, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mina Jafarabadi
- Reproductive Health Research Centre, Tehran University of Medical Sciences, Tehran, Iran
| | - Mojdeh Salehnia
- Department of Anatomy, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
| |
Collapse
|
4
|
Neykova K, Tosto V, Giardina I, Tsibizova V, Vakrilov G. Endometrial receptivity and pregnancy outcome. J Matern Fetal Neonatal Med 2020; 35:2591-2605. [PMID: 32744104 DOI: 10.1080/14767058.2020.1787977] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Human implantation is a highly complex and multifactorial process. Successful implantation requires the presence of a healthy embryo, a receptive endometrium, and a synchronized molecular dialogue between the two, as well as immune tolerance/protection from the host. The endometrial receptivity refers to a hormonally limited period in which the endometrial tissue acquires a transient functional status allowing blastocyst implantation and pregnancy initiation. Global knowledge of endometrial receptivity grew up in recent years. Improvements in genetics, new biomarkers, noninvasive methods, new advanced techniques (Endometrial receptivity assay - the ERA system, proteomic analysis) offer the possibility to evaluate the endometrial status and to manage patients with infertility problems, especially women undergoing assisted reproductive treatment. This overview reports the most relevant knowledge and recent advances in the study of implantation processes from the perspective of the endometrium, often considered as being the main barrier for a successful pregnancy initiation. Endometrial receptivity is a topic of great interest and further studies are needed for the early identification of endometrial abnormalities and the discovery of new strategies for increasing the chance for the establishment of pregnancy.
Collapse
Affiliation(s)
- Konstantsa Neykova
- Department of Reproductive Medicine, "Maichin Dom" State University Hospital, Sofia, Bulgaria
| | - Valentina Tosto
- Department of Obstetrics and Gynecology, Centre for Perinatal and Reproductive Medicine, University of Perugia, Perugia, Italy
| | - Irene Giardina
- Department of Obstetrics and Gynecology, Centre for Perinatal and Reproductive Medicine, University of Perugia, Perugia, Italy
| | - Valentina Tsibizova
- Almazov National Medical Research Centre, St Petetrsburg, Russian Federation
| | - Georgi Vakrilov
- Department of Reproductive Medicine, "Maichin Dom" State University Hospital, Sofia, Bulgaria
| |
Collapse
|
5
|
Quinn KE, Matson BC, Wetendorf M, Caron KM. Pinopodes: Recent advancements, current perspectives, and future directions. Mol Cell Endocrinol 2020; 501:110644. [PMID: 31738970 PMCID: PMC6962535 DOI: 10.1016/j.mce.2019.110644] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/08/2019] [Accepted: 11/09/2019] [Indexed: 02/02/2023]
Abstract
Successful embryo implantation is a complex and highly regulated process involving precise synchronization between the fetal-derived trophoblast cells and maternal uterine luminal epithelium. Multiple endocrine-driven factors are important for controlling the timely receptivity of the uterus, and this complexity underscores implantation failure as a major cause of recurrent infertility associated with assisted reproductive technologies. One particular cellular structure often hypothesized to promote receptivity is the pinopode or uterodome - a hormonally regulated, large cellular protrusion on the uterine epithelial surface. Recent clinical studies associate pinopodes with favorable fertility outcomes in women, and because they are directly linked to an increase in progesterone levels, the potential utility of these hormone-regulated cell biological structures in predicting or improving implantation in a clinical setting holds promise. In this review, we aim to generate interest in pinopodes from the broader cell biology and endocrinology communities, re-examine methodologies in pinopode research, and identify priorities for future investigation of pinopode structure and function in women's reproductive health.
Collapse
Affiliation(s)
- Kelsey E Quinn
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Brooke C Matson
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Margeaux Wetendorf
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Kathleen M Caron
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA.
| |
Collapse
|
6
|
Massimiani M, Lacconi V, La Civita F, Ticconi C, Rago R, Campagnolo L. Molecular Signaling Regulating Endometrium-Blastocyst Crosstalk. Int J Mol Sci 2019; 21:E23. [PMID: 31861484 PMCID: PMC6981505 DOI: 10.3390/ijms21010023] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 11/29/2019] [Accepted: 12/16/2019] [Indexed: 12/13/2022] Open
Abstract
Implantation of the embryo into the uterine endometrium is one of the most finely-regulated processes that leads to the establishment of a successful pregnancy. A plethora of factors are released in a time-specific fashion to synchronize the differentiation program of both the embryo and the endometrium. Indeed, blastocyst implantation in the uterus occurs in a limited time frame called the "window of implantation" (WOI), during which the maternal endometrium undergoes dramatic changes, collectively called "decidualization". Decidualization is guided not just by maternal factors (e.g., estrogen, progesterone, thyroid hormone), but also by molecules secreted by the embryo, such as chorionic gonadotropin (CG) and interleukin-1β (IL-1 β), just to cite few. Once reached the uterine cavity, the embryo orients correctly toward the uterine epithelium, interacts with specialized structures, called pinopodes, and begins the process of adhesion and invasion. All these events are guided by factors secreted by both the endometrium and the embryo, such as leukemia inhibitory factor (LIF), integrins and their ligands, adhesion molecules, Notch family members, and metalloproteinases and their inhibitors. The aim of this review is to give an overview of the factors and mechanisms regulating implantation, with a focus on those involved in the complex crosstalk between the blastocyst and the endometrium.
Collapse
Affiliation(s)
- Micol Massimiani
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy; (M.M.); (V.L.); (F.L.C.)
- Saint Camillus International University of Health Sciences, Via di Sant’Alessandro, 8, 00131 Rome, Italy
| | - Valentina Lacconi
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy; (M.M.); (V.L.); (F.L.C.)
| | - Fabio La Civita
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy; (M.M.); (V.L.); (F.L.C.)
| | - Carlo Ticconi
- Department of Surgical Sciences, Section of Gynecology and Obstetrics, University Tor Vergata, Via Montpellier, 1, 00133 Rome, Italy;
| | - Rocco Rago
- Physiopathology of Reproduction and Andrology Unit, Sandro Pertini Hospital, Via dei Monti Tiburtini 385/389, 00157 Rome, Italy;
| | - Luisa Campagnolo
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy; (M.M.); (V.L.); (F.L.C.)
| |
Collapse
|
7
|
Albishtue AA, Yimer N, Zakaria MZA, Haron AW, Babji AS, Abubakar AA, Almhanawi BH. Effects of EBN on embryo implantation, plasma concentrations of reproductive hormones, and uterine expressions of genes of PCNA, steroids, growth factors and their receptors in rats. Theriogenology 2018; 126:310-319. [PMID: 30605790 DOI: 10.1016/j.theriogenology.2018.12.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 12/11/2018] [Accepted: 12/14/2018] [Indexed: 01/15/2023]
Abstract
This study was conducted to determine the effect of edible bird's nest (EBN) supplement on uterine function and embryo-implantation rate. A total of 24 adult female rats, divided equally into four groups, were treated with different doses of EBN for 8 weeks. In the last week of treatment, intact fertile male rats were introduced into each group (three per group) for overnight for mating. On day 7 post-mating (post-implantation), blood samples were collected from the hearts of anaesthetised rats that were later sacrificed. The uteri were removed for assessment of embryo implantation rate, histological and electron microscopic examination, and immunohistochemical analyses. Results showed that as the concentration of EBN supplemented increased, the pregnancy and embryo implantation rates were also increased in the treated groups; significantly at G3 and G4. Although histological evaluation did not show much difference among the groups, scanning electron microscopic examination showed enhanced development of elongated microvilli and pinopods in G4. Results also revealed up-regulated expressions of epidermal growth factor (EGF), EGF receptor (EGFR), vascular endothelial growth factor (VEGF), proliferating cell nulear antigen (PCNA), and progesterone and estrogen receptors (P4R, E2R) in the uteri of treated groups. Moreover, plasma E2, P4, growth hormone (GH) and prolactin (P) levels were higher (p < 0.05) in G3 and G4. The EBN increased the antioxidant (AO) and total AO capacities (TAC) and reduced oxidative stress (OS) levels in pregnant rats. In conclusion, findings of this study revealed that EBN enhances fertility and embryo implantation rate via promoting proliferation and differentiation of uterine structures as evidenced by the upregulation of the expressions of steroid receptors, EGF, EGFR, VEGF, and PCNA in the uterus. Furthermore, observations of improved growth of ultrastructural pinopods that assist in embryo attachment with uterine epithelium, increased concentrations of E2, P4, GH and P levels, as well as increased AO capacities with reduced OS levels in the treated groups might reflect additional possible mechanisms by which EBN enhances embryo implantation rate and pregnancy success.
Collapse
Affiliation(s)
- Abdulla A Albishtue
- Department of Veterinary Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia; Department of Anatomy and Histology, Faculty of Veterinary Medicine, University of Kufa, Najaf, Iraq
| | - Nurhusien Yimer
- Department of Veterinary Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.
| | - Md Zuki A Zakaria
- Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Abd Wahid Haron
- Department of Veterinary Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Abd Salam Babji
- School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia
| | - Adamu A Abubakar
- Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia; Department of Veterinary Surgery and Radiology, Usmanu Danfodiyo University, Sokoto, Nigeria
| | - Bahaa H Almhanawi
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| |
Collapse
|
8
|
Aunapuu M, Kibur P, Järveots T, Arend A. Changes in Morphology and Presence of Pinopodes in Endometrial Cells during the Luteal Phase in Women with Infertility Problems: A Pilot Study. MEDICINA (KAUNAS, LITHUANIA) 2018; 54:E69. [PMID: 30344300 PMCID: PMC6262557 DOI: 10.3390/medicina54050069] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 11/18/2022]
Abstract
Objective: To investigate morphological changes in the endometrial epithelial cells of patients with infertility problems. Materials and methods: Endometrial biopsies were obtained from 10 women who have undergone several unsuccessful in vitro fertilisation (IVF) procedures. Endometrial biopsies were performed between luteinizing hormone surge days LH+6 to +10 of the natural menstrual cycle. Each sample was divided into three parts, which were processed for histological, transmission (TEM), and scanning electron microscopy (SEM) investigations. Results: Histological investigations demonstrated significant alterations in the apical part of epithelial cells of one patient; in four patients, the gland maturity was low, not matching the cycle day, and thus a phase lag had developed. By TEM examination, we ascertained changes in secretory and ciliated cells in three patients (decreased amount or missing microvilli, irregular cilia in ciliated cells). SEM examination found pinopodes in five patients: three samples contained fully developed pinopodes-larger and completely smooth, with only some wrinkles; one sample contained regressing small pinopodes, with wrinkled surfaces; and one sample had both developed and regressing pinopodes. Conclusions: To conclude, our study shows that the endometrium of patients with poor IVF outcome has either significant changes in the morphology or the endometrial maturation is inhibited and a phase lag often develops. Our study shows that endometrial pinopodes are found throughout the mid-luteal phase up to day LH+10.
Collapse
Affiliation(s)
- Marina Aunapuu
- Department of Anatomy, University of Tartu, Ravila 19, 50411 Tartu, Estonia.
- Department of Morphology, Estonian University of Life Sciences, Fr. Kreutzwaldi 62, 51014, Tartu, Estonia.
| | - Piret Kibur
- Department of Anatomy, University of Tartu, Ravila 19, 50411 Tartu, Estonia.
| | - Tõnu Järveots
- Department of Morphology, Estonian University of Life Sciences, Fr. Kreutzwaldi 62, 51014, Tartu, Estonia.
| | - Andres Arend
- Department of Anatomy, University of Tartu, Ravila 19, 50411 Tartu, Estonia.
| |
Collapse
|
9
|
Benkhalifa M, Zayani Y, Bach V, Copin H, Feki M, Benkhalifa M, Allal-Elasmi M. Does the dysregulation of matrix metalloproteinases contribute to recurrent implantation failure? Expert Rev Proteomics 2018; 15:311-323. [PMID: 29648896 DOI: 10.1080/14789450.2018.1464915] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
INTRODUCTION The progress in in vitro fertilization (IVF) techniques for infertility management has led to the investigation of embryo implantation site proteins such as Matrix metalloproteinases (MMPs), which may have a key role in embryo-endometrium crosstalk and in the molecular mechanisms of the embryo implantation. Areas covered: Numerous studies have generated much information concerning the relation between the different proteins at the site of implantation such as cytokines, growth factors, adhesion molecules and MMPs. However, the exact role of the MMPs in embryo implantation and the impact of their dysregulation in recurrent implantation failure have yet to be characterized. Expert commentary: The proteomic investigation of the MMPs and their molecular pathways may enable scientists and clinicians to correct this dysregulation (via appropriate means of prevention and treatment), better manage embryo transfer during IVF cycles, and thus increase the ongoing pregnancy rate.
Collapse
Affiliation(s)
- Mustapha Benkhalifa
- a Department of Biochemistry , University of Tunis El Manar , Tunis , Tunisia.,b Faculty of sciences of Bizerte , Carthage University , Jarzouna Bizerte , Tunisia
| | - Yosra Zayani
- a Department of Biochemistry , University of Tunis El Manar , Tunis , Tunisia
| | - Véronique Bach
- c PERITOX-INERIS laboratory, CURS , Picardie University Jules Verne , Amiens , France
| | - Henri Copin
- d Reproductive Medicine and developmental Biology , University Hospital and School of Medicine Picardie University Jules Verne , Amiens , France
| | - Moncef Feki
- a Department of Biochemistry , University of Tunis El Manar , Tunis , Tunisia
| | - Moncef Benkhalifa
- c PERITOX-INERIS laboratory, CURS , Picardie University Jules Verne , Amiens , France.,d Reproductive Medicine and developmental Biology , University Hospital and School of Medicine Picardie University Jules Verne , Amiens , France
| | - Monia Allal-Elasmi
- a Department of Biochemistry , University of Tunis El Manar , Tunis , Tunisia
| |
Collapse
|
10
|
Abstract
At implantation, with the acquisition of a receptive phenotype in the uterine epithelium, an initial tenuous attachment of embryonic trophectoderm initiates reorganisation of epithelial polarity to enable stable embryo attachment and the differentiation of invasive trophoblasts. In this Cell Science at a Glance article, we describe cellular and molecular events during the epithelial phase of implantation in rodent, drawing on morphological studies both in vivo and in vitro, and genetic models. Evidence is emerging for a repertoire of transcription factors downstream of the master steroidal regulators estrogen and progesterone that coordinate alterations in epithelial polarity, delivery of signals to the stroma and epithelial cell death or displacement. We discuss what is known of the cell interactions that occur during implantation, before considering specific adhesion molecules. We compare the rodent data with our much more limited knowledge of the human system, where direct mechanistic evidence is hard to obtain. In the accompanying poster, we represent the embryo-epithelium interactions in humans and laboratory rodents, highlighting similarities and differences, as well as depict some of the key cell biological events that enable interstitial implantation to occur.
Collapse
Affiliation(s)
- John D Aplin
- Maternal and Fetal Health Research Group, Manchester Academic Health Sciences Centre, St Mary's Hospital, University of Manchester, Manchester M13 9WL, UK
| | - Peter T Ruane
- Maternal and Fetal Health Research Group, Manchester Academic Health Sciences Centre, St Mary's Hospital, University of Manchester, Manchester M13 9WL, UK
| |
Collapse
|
11
|
Qu XL, Ming-Zhang, Yuan-Fang, Wang H, Zhang YZ. Effect of 2,3',4,4',5-Pentachlorobiphenyl Exposure on Endometrial Receptivity and the Methylation of HOXA10. Reprod Sci 2017. [PMID: 28631552 DOI: 10.1177/1933719117711258] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Polychlorinated biphenyls (PCBs) are one of the most common endocrine-disrupting chemicals and have obvious toxicity on human reproductive development. The aim of our study was to investigate the toxicity of chronic 2,3',4,4',5-pentachlorobiphenyl (PCB 118) exposure on embryo implantation and endometrial receptivity, with the possible mechanism of DNA methylation involved. Virgin CD-1 female mice (3 weeks old) were housed and orally treated with PCB 118 (0, 1, 10, 100 μg/kg) for a month. After mating with fertile males, the pregnant mice were killed on gestation day 4.5. Compared with the control group, implantation failures were observed in 1 μg/kg PCB 118- and 100 μg/kg PCB 118-treated groups. Abnormal endometrial morphology with open uterine lumens and densely compact stromal cells and poorly developed pinopodes were substantially in response to PCB 118 doses above, as well as the significant downregulation of implantation-associated genes (estrogen receptor 1, homeobox A10 [HOXA10], integrin subunit beta 3) and hypermethylation in the promoter region of HOXA10 further. It was confirmed that chronic exposure to PCB 118 produced an increased number of implantation failures in association with a defective uterine morphology during the implantation period. Alterations in methylation of HOXA10 could explain, at least in part, the mechanism of effects of PCB 118 exposure on the implantation process.
Collapse
Affiliation(s)
- Xin-Lan Qu
- 1 The Reproductive Medicine Center, Zhongnan Hospital of Wuhan University, Wuhan, China.,2 Department of Obstetrics and Gynecology, Zhongnan Hospital of Wuhan University, Wuhan, China.,3 Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan, China
| | - Ming-Zhang
- 1 The Reproductive Medicine Center, Zhongnan Hospital of Wuhan University, Wuhan, China.,2 Department of Obstetrics and Gynecology, Zhongnan Hospital of Wuhan University, Wuhan, China.,3 Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan, China
| | - Yuan-Fang
- 4 Department of Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Hui Wang
- 3 Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan, China.,5 Department of Pharmacology, Basic Medical School of Wuhan University, Wuhan, China
| | - Yuan-Zhen Zhang
- 1 The Reproductive Medicine Center, Zhongnan Hospital of Wuhan University, Wuhan, China.,2 Department of Obstetrics and Gynecology, Zhongnan Hospital of Wuhan University, Wuhan, China.,3 Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan, China
| |
Collapse
|
12
|
Özatik O, Mungan MT, Dağ I, Musmul A. The effect of sperm activation on pinopod formation in endometrial epithelium. J ANAT SOC INDIA 2016. [DOI: 10.1016/j.jasi.2016.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
13
|
Davidson LM, Coward K. Molecular mechanisms of membrane interaction at implantation. ACTA ACUST UNITED AC 2016; 108:19-32. [DOI: 10.1002/bdrc.21122] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 02/22/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Lien M. Davidson
- Nuffield Department of Obstetrics and Gynaecology; University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital; Headington Oxford OX3 9DU United Kingdom
| | - Kevin Coward
- Nuffield Department of Obstetrics and Gynaecology; University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital; Headington Oxford OX3 9DU United Kingdom
| |
Collapse
|
14
|
Zhang XH, Liu ZZ, Tang MX, Zhang YH, Hu L, Liao AH. Morphological Changes and Expression of Cytokine After Local Endometrial Injury in a Mouse Model. Reprod Sci 2015; 22:1377-86. [PMID: 25868581 DOI: 10.1177/1933719115580999] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To establish a mouse model for endometrial injury and determine the underlying mechanism regarding its favorable effect on embryo implantation. STUDY DESIGN Female Kunming mice were randomly allocated into 4 groups: group I, normal control; group II, injury procedure control; and group III and group IV, the mice being scratched with a blunt syringe on the right uterine horn or both, respectively. All the mice were mated with the males during the next estrus phase. The number of implanted embryos on each side of uterus was calculated on day 8 of pregnancy. The endometrial samples were taken on day 4 of pregnancy, and the local morphological changes and cytokine expressions were examined. RESULTS Compared to group II, our results showed that in group IV (1) there were significantly higher numbers of implanted embryos, (2) the endometrial glands and vasculatures in stroma were obviously increased and the pinopodes were abundant and well developed, and (3) the local levels of cytokines leukemia inhibitory factor (LIF) and oncostatin M (OSM) messenger RNA and protein expression were significantly increased. CONCLUSIONS Local mechanical injury on mouse uteri enhanced endometrial receptivity and improved embryo implantation, which were correlated with the characteristic changes in endometrial morphology and the upregulation of LIF and OSM gene and protein expression.
Collapse
Affiliation(s)
- Xiao-Hui Zhang
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Zhao-Zhao Liu
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Mao-Xing Tang
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Yong-Hong Zhang
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Lian Hu
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Ai-Hua Liao
- Family Planning Research Institute, Center for Reproductive Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| |
Collapse
|
15
|
Kumar V, Maurya VK, Joshi A, Meeran SM, Jha RK. Integrin beta 8 (ITGB8) regulates embryo implantation potentially via controlling the activity of TGF-B1 in mice. Biol Reprod 2015; 92:109. [PMID: 25788663 DOI: 10.1095/biolreprod.114.122838] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 03/09/2015] [Indexed: 01/09/2023] Open
Abstract
Integrins (ITGs) are mediators of cell-cell and cell-matrix interactions, which are also associated with embryo implantation processes by controlling the interaction of blastocyst with endometrium. During early pregnancy, ITGbeta8 (ITGB8) has been shown to interact with latent transforming growth factor (TGF) beta 1 (TGFB1) at the fetomaternal interface. However, the precise role of ITGB8 in the uterus and its association with embryo implantation has not been elucidated. Therefore, we attempted to ascertain the role of ITGB8 during the window of embryo implantation process by inhibiting its function or protein expression. Uterine plasma membrane-anchored ITGB8 was augmented at peri-implantation and postimplantation stages. A similar pattern of mRNA expression was also found during the embryo implantation period. An immunolocalization study revealed the presence of ITGB8 on luminal epithelial cells along with mild expression on the stromal cells throughout the implantation period studied; however, an intense fluorescence was noted only during the peri- and postimplantation stages. Bioneutralization and mRNA silencing of the uterine Itgb8 at preimplantation stage reduced the rate/frequency of embryo implantation and subsequent pregnancy, suggesting its indispensable role during the embryo implantation period. ITGB8 can also regulate the liberation of active TGFB1 from its latent complex, which, in turn, acts on SMAD2/3 phosphorylation (activation) in the uterus during embryo implantation. This indicates involvement of ITGB8 in the embryo implantation process through regulation of activation of TGFB1.
Collapse
Affiliation(s)
- Vijay Kumar
- Division of Endocrinology, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, Jankipuram Extension, Lucknow, Uttar Pradesh, India
| | - Vineet Kumar Maurya
- Division of Endocrinology, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, Jankipuram Extension, Lucknow, Uttar Pradesh, India
| | - Anubha Joshi
- Division of Endocrinology, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, Jankipuram Extension, Lucknow, Uttar Pradesh, India
| | - Syed Musthapa Meeran
- Division of Endocrinology, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, Jankipuram Extension, Lucknow, Uttar Pradesh, India
| | - Rajesh Kumar Jha
- Division of Endocrinology, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, Jankipuram Extension, Lucknow, Uttar Pradesh, India
| |
Collapse
|
16
|
YU NAN, YAN WENJIE, WANG YAQIN, YIN TAILANG, GUO YUE, YANG JING. Effect of Zhuyun recipe on endometrial pinopode expression in mice with embryonic implantation dysfunction and ovulation stimulation. Exp Ther Med 2015; 9:488-492. [PMID: 25574221 PMCID: PMC4280920 DOI: 10.3892/etm.2014.2138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 09/17/2014] [Indexed: 12/22/2022] Open
Abstract
Zhuyun recipe (ZYR) is a traditional Chinese medicine that has been widely used as an infertility treatment for a number of years. Although the therapeutic effects are desirable and satisfactory, the therapeutic mechanism of ZYR remains poorly understood. In the present study, pinopodes were investigated as an important morphological marker of endometrial receptivity, in order to further investigate the therapeutic mechanism of ZYR. The expression of pinopodes during the implantation window was observed using scanning electron microscopy in mice with induced ovarian stimulation (OS) and embryo implantation dysfunction (EID). A marked decrease in the number of fully developed pinopodes was observed on the endometrial surface in the OS and EID model mice, which was in accordance with the decreased pregnancy rate and number of embryonic implantation sites when compared with the control. Following treatment with ZYR, the spatial and temporal expression of pinopodes in the OS and EID mice was found to be similar to the control mice. In conclusion, ZYR was demonstrated to improve endometrial receptivity in OS and EID mice through significant improvements in the spatial and temporal expression of pinopodes.
Collapse
Affiliation(s)
- NAN YU
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - WENJIE YAN
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - YAQIN WANG
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - TAILANG YIN
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - YUE GUO
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - JING YANG
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| |
Collapse
|
17
|
Quaranta M, Erez O, Mastrolia SA, Koifman A, Leron E, Eshkoli T, Mazor M, Holcberg G. The physiologic and therapeutic role of heparin in implantation and placentation. PeerJ 2015; 3:e691. [PMID: 25653897 PMCID: PMC4304855 DOI: 10.7717/peerj.691] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 11/19/2014] [Indexed: 01/19/2023] Open
Abstract
Implantation, trophoblast development and placentation are crucial processes in the establishment and development of normal pregnancy. Abnormalities of these processes can lead to pregnancy complications known as the great obstetrical syndromes: preeclampsia, intrauterine growth restriction, fetal demise, premature prelabor rupture of membranes, preterm labor, and recurrent pregnancy loss. There is mounting evidence regarding the physiological and therapeutic role of heparins in the establishment of normal gestation and as a modality for treatment and prevention of pregnancy complications. In this review, we will summarize the properties and the physiological contributions of heparins to the success of implantation, placentation and normal pregnancy.
Collapse
Affiliation(s)
- Michela Quaranta
- Department of Obstetrics and Gynecology, Azienda Ospedaliera Universitaria Integrata, Università degli Studi di Verona , Verona , Italy
| | - Offer Erez
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| | - Salvatore Andrea Mastrolia
- Department of Obstetrics and Gynecology, Azienda Ospedaliera-Universitaria Policlinico di Bari, School of Medicine, University of Bari "Aldo Moro" , Bari , Italy
| | - Arie Koifman
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| | - Elad Leron
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| | - Tamar Eshkoli
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| | - Moshe Mazor
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| | - Gershon Holcberg
- Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev , Beer Sheva , Israel
| |
Collapse
|
18
|
Salleh N, Helmy MM, Fadila KN, Yeong SO. Isoflavone genistein induces fluid secretion and morphological changes in the uteri of post-pubertal rats. Int J Med Sci 2013; 10:665-75. [PMID: 23569430 PMCID: PMC3619115 DOI: 10.7150/ijms.5207] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 03/04/2013] [Indexed: 02/03/2023] Open
Abstract
UNLABELLED A reported increase in the incidence of infertility following high genistein intake could be related to alteration in the normal fluid volume and morphology of the uterus in adult female. In view of this, we investigated the effect of this compound on fluid secretion, fluid volume and morphology of the uterus in post-pubertal rats. METHODS Ovariectomised SD rats were treated with 17-β oestradiol (E) (0.8 X 10(-4) mg/kg/day) and genistein (0.5, 5, 10, 25, 50 and 100 mg/kg/day) for three days. Following drug treatment, in-vivo uterine perfusion was performed and the rate of fluid secretion and the volume of fluid in the uterus were determined via changes in weight (μl/min) and F-dextran concentration of the perfusate respectively. The animals were then sacrificed and the uteri were removed for weight determination, morphological analyses and proliferative cell nuclear antigen (PCNA) expression analyses by Western blotting. RESULTS Subcutaneous genistein treatment resulted in a dose-dependent increase in fluid secretion rate, fluid volume and uterine wet weight. Treatment with 100 mg/kg/day genistein resulted in a remarkable increase in the rate of uterine fluid secretion, the volume of the uterine luminal fluid as well as the circumference of the uterine and uterine glandular lumen suggesting an excessive fluid accumulation. Meanwhile, there were evidence of glandular hyperplasia and an increase in the expression of PCNA following treatment with 50 and 100 mg/kg/day genistein. CONCLUSION High genistein intake could potentially cause adverse effects on the uterus by inducing excessive fluid secretion and accumulation as well as hyperplasia.
Collapse
Affiliation(s)
- Naguib Salleh
- Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia.
| | | | | | | |
Collapse
|
19
|
Li R, Yu C, Gao R, Liu X, Lu J, Zhao L, Chen X, Ding Y, Wang Y, He J. Effects of DEHP on endometrial receptivity and embryo implantation in pregnant mice. JOURNAL OF HAZARDOUS MATERIALS 2012; 241-242:231-240. [PMID: 23046697 DOI: 10.1016/j.jhazmat.2012.09.038] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 09/14/2012] [Accepted: 09/16/2012] [Indexed: 06/01/2023]
Abstract
Di-(2-ethylhexyl)-phthalate (DEHP) is a ubiquitous environmental pollutant and endocrine disruptor (ED) that causes serious adverse effects on animal and human health. The harmful effects of DEHP on human reproduction are increasingly recognized, especially in women. However, it is not known how endometrial receptivity and embryo implantation, which play important roles in the establishment of pregnancy, are affected by DEHP. This study was aimed towards investigating the effects of DEHP on endometrial receptivity and embryo implantation in pregnant mice. The pregnant mice received DEHP at 0, 250, 500 and 1000 mg/kg/day from day 1 (D1) of gestation until sacrifice. Administration of DEHP led to compromised endometrial receptivity and decreased number of implantation sites. The mRNA and protein expression levels of ERα, PR and E-cadherin, but not those of HoxA10 and MMP-2, were up-regulated by DEHP in the mouse endometrium. The results further suggested that DEHP disrupts the MAPK and NF-κB signaling pathways. This was maybe one of paths which influenced the E-cadherin expression. In conclusion, DEHP reduced endometrial receptivity and impaired embryo implantation by influencing the expression of hormone receptors and E-cadherin. Therefore, determining the full extent of the hazards of DEHP to human reproduction will be vital to developing and implementing effective protective measures.
Collapse
Affiliation(s)
- Rui Li
- Laboratory of Reproductive Biology, School of Public Health, Chongqing Medical University, Chongqing, PR China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Rashid NA, Lalitkumar S, Lalitkumar PG, Gemzell-Danielsson K. Endometrial receptivity and human embryo implantation. Am J Reprod Immunol 2011; 66 Suppl 1:23-30. [PMID: 21726335 DOI: 10.1111/j.1600-0897.2011.01048.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
PROBLEM The pre-requisite of successful implantation involves an intricate cascade of molecular interactions which plays a crucial role in preparing receptive endometrium and implanting blastocyst. METHOD OF STUDY Data are hereby presented for a better understanding of endometrial receptivity in women, hoping to provide a comprehensive picture of the process and identify new areas of basic and translational research in the biology of blastocyst implantation. RESULTS Timely regulation of the expression of a number of complex molecules like hormones, cytokines and growth factors, and their crosstalk from embryonic and maternal endometrial side play a major role in determining the fate of the embryo. The molecular basis of endometrial receptivity and the mechanisms by which the blastocyst first adheres to the luminal epithelium and then penetrates into the stroma are only just beginning to be resolved. CONCLUSION Advances in the development of implantation models and 'omics' technologies, particularly proteomics and metabolomics, are set to have a major impact on the development of this field.
Collapse
Affiliation(s)
- Najwa A Rashid
- Division of Genomics & Genetics, School of Biological Sciences, Nanyang Technological University, Singapore city, Singapore
| | | | | | | |
Collapse
|
21
|
Sudoma I, Goncharova Y, Zukin V. Optimization of cryocycles by using pinopode detection in patients with multiple implantation failure: preliminary report. Reprod Biomed Online 2011; 22:590-6. [DOI: 10.1016/j.rbmo.2011.02.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 01/21/2011] [Accepted: 02/02/2011] [Indexed: 10/18/2022]
|
22
|
Abstract
Implantation failure is the most important rate limiting factor in the success of assisted reproductive techniques like In vitro fertilization–embryo transfer (IVF-ET). Cytokines are multifunctional signaling molecules having an implicit role in the human implantation process. This review focuses on the redundant roles of cytokines during the various stages of implantation. It also indicates that levels of cytokines in biological fluids like serum and follicular fluid obtained during oocyte retrieval might act as determinants of implantation potential of the blastocyst. Thus a holistic, metabolomic approach of analyzing biological fluids may provide a simpler approach to study the hitherto enigmatic process rather than the proteomic and genomic approach.
Collapse
Affiliation(s)
- Natachandra Chimote
- Vaunshdhara Clinic and Assisted Conception Centre, 9, Dr. Munje Marg, Congress Nagar, Nagpur, India
| | - Meena Chimote
- Vaunshdhara Clinic and Assisted Conception Centre, 9, Dr. Munje Marg, Congress Nagar, Nagpur, India
| | - Bindu Mehta
- Vaunshdhara Clinic and Assisted Conception Centre, 9, Dr. Munje Marg, Congress Nagar, Nagpur, India
| | - Nirmalendu Nath
- Vaunshdhara Clinic and Assisted Conception Centre, 9, Dr. Munje Marg, Congress Nagar, Nagpur, India
| |
Collapse
|
23
|
Singh H, Nardo L, Kimber SJ, Aplin JD. Early stages of implantation as revealed by an in vitro model. Reproduction 2010; 139:905-14. [DOI: 10.1530/rep-09-0271] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Our limited understanding of the processes underlying steroid hormonal control of human endometrial receptivity is largely due to the lack of a relevant model system. To overcome scarcity of material, we have developed a model in which mouse embryos attach to human Ishikawa cells, which express functional steroid hormone receptors. Blastocysts flushed from day 4 pregnant superovulated mice were transferred to confluent Ishikawa cell monolayers. After 48 h of co-culture, 85% of the blastocysts had attached loosely, but only 40% attached stably to the epithelial cell surface. In contrast, 95% of the embryos attached stably to tissue culture plastic. Thus, weak attachment of a majority of the embryos was followed by stronger adhesion of a smaller proportion. Seventeen percent of the transferred blastocysts modified the epithelial cell surface with loss of MUC1 at the attachment site, extending variably to adjacent epithelial cells. Initially, stable attachment occurred without disruption to the integrity of the epithelial monolayer, but at later stages after the embryo had spread laterally, displacement of subjacent cells was observed. A modest increase in stable attachment, but no changes to MUC1 clearance, was observed after assisted hatching. After 24 h priming of Ishikawa cells by 17β-oestradiol (OE2) followed by 72-h incubation with medroxyprogesterone acetate and OE2, stable attachment increased from 40 to 70%. Initial attachment is efficient either in the presence or in the absence of hormone; steroid treatment increased the incidence of stable attachment. Implantation failure is predicted to occur in this model when embryos fail to progress from initial to stable attachment.
Collapse
|
24
|
Singh H, Aplin JD. Adhesion molecules in endometrial epithelium: tissue integrity and embryo implantation. J Anat 2009; 215:3-13. [PMID: 19453302 PMCID: PMC2714633 DOI: 10.1111/j.1469-7580.2008.01034.x] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2008] [Indexed: 12/16/2022] Open
Abstract
Cell adhesion in endometrial epithelium is regulated to maintain the continuity and protectiveness of the luminal covering cell layer while permitting interstitial implantation of the embryo during a restricted period of about 4 days. Many apparently normal embryos fail to implant, and epithelial-embryo adhesion remains a poorly understood phenomenon. After menstruation, epithelial regeneration occurs by epiboly from the basal residues of glands, an activity that requires migration on extracellular matrix as well as cell-cell cohesion. Here we review current knowledge of adhesion molecules in the epithelium.
Collapse
Affiliation(s)
- Harmeet Singh
- Maternal and Fetal Health Research Group, University of Manchester, Manchester, UK
| | | |
Collapse
|
25
|
Teklenburg G, Macklon NS. Review: In Vitro Models for the Study of Early Human Embryo-Endometrium Interactions. Reprod Sci 2009; 16:811-8. [DOI: 10.1177/1933719109334966] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Gijs Teklenburg
- Department of Reproduction and Gynaecology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Nick S. Macklon
- Department of Reproduction and Gynaecology, University Medical Center Utrecht, Utrecht, The Netherlands,
| |
Collapse
|
26
|
Quinn C, Casper R. Pinopodes: a questionable role in endometrial receptivity. Hum Reprod Update 2008; 15:229-36. [DOI: 10.1093/humupd/dmn052] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
27
|
Li M, Wu Y, Caron KM. Haploinsufficiency for adrenomedullin reduces pinopodes and diminishes uterine receptivity in mice. Biol Reprod 2008; 79:1169-75. [PMID: 18716289 DOI: 10.1095/biolreprod.108.069336] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Adrenomedullin (AM) is a multifunctional peptide vasodilator that signals through a G-protein-coupled receptor when the receptor, called calcitonin receptor-like receptor (CL), is associated with a receptor activity-modifying protein 2 (RAMP2). We demonstrated previously that haploinsufficieny for each of these genes led to reduced maternal fertility, and that even a modest genetic reduction of AM peptide caused maternal defects in implantation, placentation, and fetal growth. Here, we further demonstrate that Adm(+/-) female mice displayed reduced pregnancy success rates that were not caused by defects in folliculogenesis, ovulation, or fertilization. The poor fertility of Adm(+/-) female mice could not be rescued by transfer of wild-type blastocysts, which suggested an underlying defect in uterine receptivity. In fact, we found that Adm, Calcrl, and Ramp2 gene expressions are tightly and spatiotemporally regulated in the luminal epithelial cells of the uterus during the estrus cycle and the peri-implantation period. RAMP3, which also generates an AM receptor when associated with CL, had a diametrically opposite expression pattern than that of Adm, Calcrl, and Ramp2 and was most robustly induced in the stroma of the uterus. Finally, we discovered that Adm(+/-) female mice have a substantially reduced number of pinopodes on the uterine luminal epithelial surface, which is indicative and possibly causative of the poor uterine receptivity. Taken together, our studies identify a new class of pharmacologically tractable proteins that are involved in establishing uterine receptivity through the regulation of pinopode formation.
Collapse
Affiliation(s)
- Manyu Li
- Department of Cell and Molecular Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | | | | |
Collapse
|
28
|
Kimber SJ. Blastocyst implantation:the adhesion cascade. REPRODUCTIVE MEDICINE AND ASSISTED REPRODUCTIVE TECHNIQUES 2008. [DOI: 10.3109/9780203091500.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
29
|
Taylor E, Gomel V. The uterus and fertility. Fertil Steril 2007; 89:1-16. [PMID: 18155200 DOI: 10.1016/j.fertnstert.2007.09.069] [Citation(s) in RCA: 213] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Revised: 09/10/2007] [Accepted: 09/10/2007] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To review the current understanding of the role the uterus plays in embryo implantation and to outline congenital anomalies and acquired diseases that impact normal uterine function. DESIGN The publications related to the embryo implantation, Mullerian anomalies, uterine polyps, uterine synechiae, and myomas were identified through Medline and reviewed. CONCLUSION(S) Congenital anomalies and acquired diseases of the uterus may negatively impact on the complex processes of embryo implantation. Hysteroscopic surgery to correct uterine septa, intrauterine synechiae, and myomas that distort the uterine cavity may benefit women with infertility or recurrent pregnancy loss. The effect of endometrial polyps on fertility is uncertain, but their removal, once identified, is justifiable. Complex congenital anomalies such as unicornuate uterus and uterus didelphys may negatively affect fertility and pregnancy outcome, and surgical treatment may benefit select patients.
Collapse
Affiliation(s)
- Elizabeth Taylor
- Department of Obstetrics and Gynecology, University of British Columbia, BC Women's Hospital and Women's Health Centre,Vancouver, British Columbia, Canada.
| | | |
Collapse
|
30
|
Abstract
Low rates of implantation are an impediment to more efficient assisted reproduction techniques. Improved endometrial receptivity and embryo preparation should lead to higher pregnancy rates, lower rates of early pregnancy failure and fewer multiple pregnancies. As the first site of contact between embryo and endometrium, the luminal epithelium (LE) is responsible for the non-receptive status of proliferative and early secretory tissue, and transformation to receptivity in the mid-secretory phase presumably requires alterations in expression, organization or activation of adhesion systems. Luminal cells are less abundant than their glandular counterparts, and are under-represented in global tissue datasets. Furthermore, alterations in cell surface composition can be readily accomplished by mechanisms that do not rely on altered transcription or translation. Current data from in-vitro models are consistent with initial attachment to mucin in the apical glycocalyx, perhaps via a carbohydrate-mediated interaction, after which the epithelial phenotype is modified by a medium- or short-range embryonic signal. A cascade of interactions follows, mediating embryo migration across the epithelium. Strikingly, numerous potential mediators of adhesion at implantation are located in the lateral rather than the apical surface of LE cells. Attached embryos appear to gain rapid access to this highly adhesive lateral membrane domain.
Collapse
Affiliation(s)
- J D Aplin
- Division of Human Development, Medical School, University of Manchester, UK.
| |
Collapse
|
31
|
Utsunomiya T, Ito H, Hirai K, Otsu E, Watanabe H, Mori T. Developmentally retarded frozen blastocysts can be rescued by synchronizing culture prior to transfer. Reprod Biomed Online 2006; 12:622-9. [PMID: 16790109 DOI: 10.1016/s1472-6483(10)61189-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Asynchrony between embryo development and endometrial differentiation is the limiting step of successful pregnancy in assisted reproduction. The aim of this study was to investigate whether or not post-thaw synchronization culture of day 5-6 frozen embryos, prior to transfer, with endometrial differentiation resulted in pregnancy. A total of 142 cycles of 134 patients were transferred in three protocols. Blastocysts with cavities larger than half of the entire blastocyst volume were transferred without synchronizing culture on day 5 or 6 of progesterone commencement (P5/6) in hormone replacement treatment cycles (protocol 1). Blastocysts with cavitation below half of the entire blastocyst were cultured for 1 or 2 days after thawing prior to transfer on P5 or P6 (protocol 2). Morulae and very early stage blastocysts were thawed on the days corresponding to P5 and P6, and only the embryos that reached expanded or hatching blastocysts were transferred on P7 without synchronizing culture (protocol 3). Pregnancy rate in protocol 2 (32.0%) was comparable with that of protocol 1 (35.0%). It is concluded that developmentally retarded frozen embryos can be rescued with synchronizing culture prior to transfer by evading asynchrony.
Collapse
|
32
|
Abstract
Leukaemia inhibitory factor (LIF) is one of the most important cytokines in the reproductive tract. Without expression of LIF in the uterus, implantation of a blastocyst cannot begin. Yet, 13 years after publication of the phenotype of the LIF knockout mouse we are only just beginning to understand how LIF functions in the uterus. This review addresses our knowledge of the role of LIF in regulating implantation through its influence on the luminal epithelium and stromal decidualization, but also its influence on reproductive tract cells such as leukocytes and glandular epithelium, during the pre-implantation phase of pregnancy.
Collapse
Affiliation(s)
- Susan J Kimber
- Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK.
| |
Collapse
|
33
|
Staun-Ram E, Shalev E. Human trophoblast function during the implantation process. Reprod Biol Endocrinol 2005; 3:56. [PMID: 16236179 PMCID: PMC1289292 DOI: 10.1186/1477-7827-3-56] [Citation(s) in RCA: 215] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Accepted: 10/20/2005] [Indexed: 12/17/2022] Open
Abstract
The implantation process involves complex and synchronized molecular and cellular events between the uterus and the implanting embryo. These events are regulated by paracrine and autocrine factors. Trophoblast invasion and migration through the uterine wall is mediated by molecular and cellular interactions, controlled by the trophoblast and the maternal microenvironment. This review is focused on the molecular constituents of the human trophoblast, their actions and interactions, including interrelations with the uterine endometrium.
Collapse
Affiliation(s)
- Elsebeth Staun-Ram
- Laboratory for Research in Reproductive Sciences, Department of Obstetrics and Gynecology, Ha'Emek Medical Center, 18101, Afula, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Eliezer Shalev
- Laboratory for Research in Reproductive Sciences, Department of Obstetrics and Gynecology, Ha'Emek Medical Center, 18101, Afula, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| |
Collapse
|
34
|
Horne AW, Lalani EN, Margara RA, Ryder TA, Mobberley MA, White JO. The expression pattern of MUC1 glycoforms and other biomarkers of endometrial receptivity in fertile and infertile women. Mol Reprod Dev 2005; 72:216-29. [PMID: 15971251 DOI: 10.1002/mrd.20307] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Changes in the surface epithelium of the endometrium, characterized in part by alterations in cell-surface molecules, sex steroid receptors and the appearance of pinopodes, coincide with the window of endometrial receptivity in the menstrual cycle. This study was performed to evaluate the usefulness of hematoxylin and eosin staining, scanning and transmission microscopy, and MUC1 glycoform, sex steroid receptor, and interleukin receptor (type 1) expression as biomarkers of endometrial receptivity using carefully characterized clinical fertile and infertile groups of women. Using a combination of immunohistochemistry and scanning electron microscopy (SEM) called scanning immunoelectron microscopy (SIM), we confirmed that MUC1 mucin was not associated with the endometrial pinopodes, which have been linked with embryo adhesion. We also showed that failure of embryo implantation was associated with an abnormal endometrial expression of MUC1 mucin, and retention of nuclear progesterone receptor (PR) particularly in epithelial cells. Hematoxylin and eosin staining, transmission electron microscopy (TEM), SEM in isolation and immunohistochemistry for interleukin receptor were not shown to be useful markers. Progesterone-dependent regulation of MUC1 appears to be an important factor in determining endometrial receptivity.
Collapse
Affiliation(s)
- A W Horne
- Institute of Developmental and Reproductive Biology, Imperial College, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK.
| | | | | | | | | | | |
Collapse
|
35
|
Petersen A, Bentin-Ley U, Ravn V, Qvortrup K, Sørensen S, Islin H, Sjögren A, Mosselmann S, Hamberger L. The antiprogesterone Org 31710 inhibits human blastocyst-endometrial interactions in vitro. Fertil Steril 2005; 83 Suppl 1:1255-63. [PMID: 15831300 DOI: 10.1016/j.fertnstert.2004.08.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2004] [Revised: 08/16/2004] [Accepted: 08/16/2004] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To investigate the effect of the anti-P Org 31710 on human blastocyst attachment to cultured endometrial epithelial cells. DESIGN Experimental in vitro study. SETTING University hospital. PATIENT(S) Eleven fertile endometrial donors. INTERVENTION(S) Timed endometrial biopsy for cell cultures. MAIN OUTCOME MEASURE(S) Blastocyst attachment rate on endometrial cell cultures; secretion of glycodelin and leukemia inhibitory factor into the culture medium measured by RIA and ELISA techniques; and expression of progesterone receptors, interleukin-1 receptor type-1, and integrin subunit beta(3) on endometrial epithelial cells examined by immunohistochemistry. Endometrial pinopodes visualized by scanning electron microscopy. RESULT(S) Eleven of 16 human blastocysts attached to control cultures, whereas none of 10 blastocysts attached when Org 31710 was added to the culture medium (P=.0007). Immunohistochemical studies demonstrated no significant differences between groups. Biochemical analyses displayed a trend toward higher glycodelin secretions and, by scanning electron microscopy, a tendency toward less pinopode formation in the Org 31710 group, but the results did not reach statistical significance. The presence of swollen microvilli, precursors of endometrial pinopodes, was significantly reduced on cultures with Org 31710 (P=.03). CONCLUSION(S) The study presents a model for human blastocyst-endometrial interactions responding to an anti-P drug. The exact mechanism for the anti-attachment properties of Org 31710 on the cultured endometrial cells and the blastocysts needs further evaluations.
Collapse
Affiliation(s)
- Astrid Petersen
- Department of Obstetrics and Gynecology, Herlev University Hospital, Herlev Ringvej 75, DK-2730 Herlev, Denmark.
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Fouladi-Nashta AA, Jones CJP, Nijjar N, Mohamet L, Smith A, Chambers I, Kimber SJ. Characterization of the uterine phenotype during the peri-implantation period for LIF-null, MF1 strain mice. Dev Biol 2005; 281:1-21. [PMID: 15848385 DOI: 10.1016/j.ydbio.2005.01.033] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Revised: 01/20/2005] [Accepted: 01/21/2005] [Indexed: 11/18/2022]
Abstract
Leukemia inhibitory factor plays a major role in the uterus and in its absence embryos fail to implant. Our knowledge of the targets for LIF and the consequences of its absence is still very incomplete. In this study, we have examined the ultrastructure of the potential implantation site in LIF-null MF1 female mice compared to that of wild type animals. We also compared expression of proteins associated with implantation in luminal epithelium and stroma. Luminal epithelial cells (LE) of null animals failed to develop apical pinopods, had increased glycocalyx, and retained a columnar shape during the peri-implantation period. Stromal cells of LIF-null animals showed no evidence of decidual giant cell formation even by day 6 of pregnancy. A number of proteins normally expressed in decidualizing stroma did not increase in abundance in the LIF-null animals including desmin, tenascin, Cox-2, bone morphogenetic protein (BMP)-2 and -7, and Hoxa-10. In wild type animals, the IL-6 family member Oncostatin M (OSM) was found to be transiently expressed in the luminal epithelium on late day 4 and then in the stroma at the attachment site on days 5-6 of pregnancy, with a similar but not identical pattern to that of Cox-2. In the LIF-null animals, no OSM protein was detected in either LE or stroma adjacent to the embryo, indicating that expression requires uterine LIF in addition to a blastocyst signal. Fucosylated epitopes: the H-type-1 antigen and those recognized by lectins from Ulex europaeus-1 and Tetragonolobus purpureus were enhanced on apical LE on day 4 of pregnancy. H-type-1 antigen remained higher on day 5, and was not reduced even by day 6 in contrast to wild type uterus. These data point to a profound disturbance of normal luminal epithelial and stromal differentiation during early pregnancy in LIF-nulls. On this background, we also obtained less than a Mendelian ratio of null offspring suggesting developmental failure.
Collapse
Affiliation(s)
- A A Fouladi-Nashta
- Faculty of Life Sciences, University of Manchester, 3.239 Stopford Building, Oxford Road, Manchester M13 9PT, UK
| | | | | | | | | | | | | |
Collapse
|
37
|
Julian J, Enders AC, Fazleabas AT, Carson DD. Compartmental distinctions in uterine Muc-1 expression during early pregnancy in cynomolgous macaque (Macaca fascicularis) and baboon (Papio anubis). Hum Reprod 2005; 20:1493-503. [PMID: 15774539 DOI: 10.1093/humrep/deh801] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Loss of the transmembrane mucin, Muc-1, is a molecular correlate of the acquisition of uterine receptivity to embryo adhesion in most species examined. In macaques, two distinct adhesion events occur at opposite sides of the uterus. Attachment to the secondary site is delayed relative to the primary site. The aim was to determine if Muc-1 is removed at secondary sites prior to trophoblast attachment. METHODS We examined Muc-1 expression in the uteri of cynomolgus macaque and baboon during early implantation by immunocytochemistry. RESULTS Luminal epithelia were devoid of Muc-1 at all stages examined at both primary and secondary adhesion sites. Loss of Muc-1 in luminal epithelia was found to be maternally determined, accompanied membrane transformation in both macaque and baboon, and at secondary implantation sites, preceded trophoblast attachment. In contrast, glandular epithelia in pregnant macaques exhibited a temporal and compartmentalized gradient of Muc-1 loss confined to the implantation sites. Glandular epithelia in the pregnant baboon uterus were uniformly negative for Muc-1. CONCLUSIONS Restriction of the Muc-1 loss in glandular epithelia to conceptual cycles may reflect the fundamental distinctions among epithelia of the various uterine compartments and the differential modulation of Muc-1 that occurs within these compartments in conceptual and non-conceptual cycles.
Collapse
Affiliation(s)
- JoAnne Julian
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | | | | | | |
Collapse
|