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Benagiano G, Mancuso S, Guo SW, Di Renzo GC. Events Leading to the Establishment of Pregnancy and Placental Formation: The Need to Fine-Tune the Nomenclature on Pregnancy and Gestation. Int J Mol Sci 2023; 24:15420. [PMID: 37895099 PMCID: PMC10607313 DOI: 10.3390/ijms242015420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/10/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023] Open
Abstract
Today, there is strong and diversified evidence that in humans at least 50% of early embryos do not proceed beyond the pre-implantation period. This evidence comes from clinical investigations, demography, epidemiology, embryology, immunology, and molecular biology. The purpose of this article is to highlight the steps leading to the establishment of pregnancy and placenta formation. These early events document the existence of a clear distinction between embryonic losses during the first two weeks after conception and those occurring during the subsequent months. This review attempts to highlight the nature of the maternal-embryonic dialogue and the major mechanisms active during the pre-implantation period aimed at "selecting" embryos with the ability to proceed to the formation of the placenta and therefore to the completion of pregnancy. This intense molecular cross-talk between the early embryo and the endometrium starts even before the blastocyst reaches the uterine cavity, substantially initiating and conditioning the process of implantation and the formation of the placenta. Today, several factors involved in this dialogue have been identified, although the best-known and overall, the most important, still remains Chorionic Gonadotrophin, indispensable during the first 8 to 10 weeks after fertilization. In addition, there are other substances acting during the first days following fertilization, the Early Pregnancy Factor, believed to be involved in the suppression of the maternal response, thereby allowing the continued viability of the early embryo. The Pre-Implantation Factor, secreted between 2 and 4 days after fertilization. This linear peptide molecule exhibits a self-protective and antitoxic action, is present in maternal blood as early as 7 days after conception, and is absent in the presence of non-viable embryos. The Embryo-Derived Platelet-activating Factor, produced and released by embryos of all mammalian species studied seems to have a role in the ligand-mediated trophic support of the early embryo. The implantation process is also guided by signals from cells in the decidualized endometrium. Various types of cells are involved, among them epithelial, stromal, and trophoblastic, producing a number of cellular molecules, such as cytokines, chemokines, growth factors, and adhesion molecules. Immune cells are also involved, mainly uterine natural killer cells, macrophages, and T cells. In conclusion, events taking place during the first two weeks after fertilization determine whether pregnancy can proceed and therefore whether placenta's formation can proceed. These events represent the scientific basis for a clear distinction between the first two weeks following fertilization and the rest of gestation. For this reason, we propose that a new nomenclature be adopted specifically separating the two periods. In other words, the period from fertilization and birth should be named "gestation", whereas that from the completion of the process of implantation leading to the formation of the placenta, and birth should be named "pregnancy".
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Affiliation(s)
- Giuseppe Benagiano
- Faculty of Medicine and Surgery, Sapienza University of Rome, 00185 Rome, Italy;
- Geneva Foundation for Medical Education and Research, 1206 Geneva, Switzerland
| | - Salvatore Mancuso
- Faculty of Medicine and Surgery, Catholic University of the Sacred Heart, 00168 Rome, Italy;
| | - Sun-Wei Guo
- Research Institute, Shanghai Obstetrics & Gynecology Hospital, Fudan University, Shanghai 200011, China;
| | - Gian Carlo Di Renzo
- Center for Perinatal and Reproductive Medicine, University of Perugia, 06156 Perugia, Italy
- Department of Obstetrics, Gynecology and Perinatology, I.M. Sechenov First Moscow State Medical University, 119146 Moscow, Russia
- Department of Obstetrics & Gynecology, Wayne State University School of Medicine, Detroit, MI 48201, USA
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Zare F, Seifati SM, Dehghan-Manshadi M, Fesahat F. Preimplantation Factor (PIF): a peptide with various functions. JBRA Assist Reprod 2020; 24:214-218. [PMID: 32202400 PMCID: PMC7169918 DOI: 10.5935/1518-0557.20190082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Preimplantation Factor (PIF) is a novel fifteen amino acid linear peptide (MVRIKPGSANKPSDD), which has different biological functions in mammalian species e.g. its role in neuron restoration, pregnancy and related disorders, and also in autoimmune diseases. Since all clinical studies have shown that PIF has both local and systemic effects, it can be considered as an integrated therapy for the treatment of inflammation conditions, along with the prevention of advanced disease. The synthetic PIF (sPIF) analog is a good representative of native PIF action, and it regulates peripheral immune cells to achieve endurance without immune suppression - an effective agent in nonpregnant autoimmune models. This study provides information, from evidence-based studies so far about PIF’s different functional aspects.
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Affiliation(s)
- Fateme Zare
- Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Mohammad Seifati
- Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mahdi Dehghan-Manshadi
- Department of Immunology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farzaneh Fesahat
- Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Goodale LF, Hayrabedyan S, Todorova K, Roussev R, Ramu S, Stamatkin C, Coulam CB, Barnea ER, Gilbert RO. PreImplantation factor (PIF) protects cultured embryos against oxidative stress: relevance for recurrent pregnancy loss (RPL) therapy. Oncotarget 2018; 8:32419-32432. [PMID: 28423690 PMCID: PMC5464799 DOI: 10.18632/oncotarget.16028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 02/22/2017] [Indexed: 11/25/2022] Open
Abstract
Recurrent pregnancy loss (RPL) affects 2-3% of couples. Despite a detailed work-up, the etiology is frequently undefined, leading to non-targeted therapy. Viable embryos and placentae express PreImplantation Factor (PIF). Maternal circulating PIF regulates systemic immunity and reduces circulating natural killer cells cytotoxicity in RPL patients. PIF promotes singly cultured embryos' development while anti-PIF antibody abrogates it. RPL serum induced embryo toxicity is negated by PIF. We report that PIF rescues delayed embryo development caused by <3 kDa RPL serum fraction likely by reducing reactive oxygen species (ROS). We reveal that protein disulfide isomerase/thioredoxin (PDI/TRX) is a prime PIF target in the embryo, rendering it an important ROS scavenger. The 16F16-PDI/TRX inhibitor drastically reduced blastocyst development while exogenous PIF increased >2 fold the number of embryos reaching the blastocyst stage. Mechanistically, PDI-inhibitor preferentially binds covalently to oxidized PDI over its reduced form where PIF avidly binds. PIF by targeting PDI/TRX at a distinct site limits the inhibitor's pro-oxidative effects. The >3kDa RPL serum increased embryo demise by three-fold, an effect negated by PIF. However, embryo toxicity was not associated with the presence of putative anti-PIF antibodies. Collectively, PIF protects cultured embryos both against ROS, and higher molecular weight toxins. Using PIF for optimizing in vitro fertilization embryos development and reducing RPL is warranted.
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Affiliation(s)
- Lindsay F Goodale
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.,Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, CA, USA
| | - Soren Hayrabedyan
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Krassimira Todorova
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | | | - Sivakumar Ramu
- CARI Reproductive Institute, Chicago, IL, USA.,Promigen Life Sciences, Downers Grove, IL, USA
| | - Christopher Stamatkin
- CARI Reproductive Institute, Chicago, IL, USA.,Therapeutic Validation Core, Indiana University Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Eytan R Barnea
- BioIncept, LLC, Cherry Hill, NJ, USA.,Society for the Investigation of Early Pregnancy (SIEP), Cherry Hill, NJ, USA
| | - Robert O Gilbert
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.,Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies
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Chih Chen Y, Rivera J, Fitzgerald M, Hausding C, Ying YL, Wang X, Todorova K, Hayrabedyan S, Barnea ER, Peter K. PreImplantation factor prevents atherosclerosis via its immunomodulatory effects without affecting serum lipids. Thromb Haemost 2017; 115:1010-24. [DOI: 10.1160/th15-08-0640] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 01/11/2016] [Indexed: 01/08/2023]
Abstract
SummaryPreImplantation factor (PIF) is a 15-amino acid peptide endogenously secreted by viable embryos, regulating/enabling maternal (host) acceptance/tolerance to the “invading” embryo (allograft) all-while preserving maternal immunity to fight infections. Such attributes make PIF a potential therapeutic agent for chronic inflammatory diseases. We investigated whether PIF’s immunomodulatory properties prevent progression of atherosclerosis in the hyper-cholesterolaemic ApoEdeficient murine model. Male, high-fat diet fed, ApoE-deficient (ApoE-/-) mice were administered either PBS, scrambled PIF (0.3–3 mg/kg) or PIF (0.3–3 mg/kg) for seven weeks. After treatment, PIF (3 mg/kg)-treated ApoE-/- mice displayed significantly reduced atherosclerosis lesion burden in the aortic sinus and aortic arch, without any effect on lipid profile. PIF also caused a significant reduction in infiltration of macrophages, decreased expression of pro-inflammatory adhesion molecules, cytokines and chemokines in the plaque, and reduced circulating IFN-γ levels. PIF preferentially binds to monocytes/neutrophils. In vitro, PIF attenuated monocyte migration (MCP-1-induced chemotaxis assay) and in vivo in LPS peritonitis model. Also PIF prevented leukocyte extravasation (peritonitis thioglycollate-induced model), demonstrating that PIF exerts its effect in part by modulation of monocyte function. Inhibition of the potassium channel KCNAB3 (Kv1.3) and of the insulin degrading enzyme (IDE) was demonstrated as potential mechanism of PIF’s immunomodulatory effects. In conclusion, PIF regulates/lowers inflammation and prevents atherosclerosis development without affecting circulating lipids. Overall our findings establish PIF as a strong immunomodulatory drug candidate for atherosclerosis therapy.Supplementary Material to this article is available online at www.thrombosis-online.com.
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Barnea E, Almogi-Hazan O, Or R, Mueller M, Ria F, Weiss L, Paidas M. Immune regulatory and neuroprotective properties of preimplantation factor: From newborn to adult. Pharmacol Ther 2015; 156:10-25. [DOI: 10.1016/j.pharmthera.2015.10.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Proliferation and decidualization of endometrial stromal cells during embryo-attachment stage in bonnet monkeys (Macaca radiata). Cell Tissue Res 2015; 361:605-17. [DOI: 10.1007/s00441-015-2117-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 12/19/2014] [Indexed: 10/24/2022]
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Barnea ER, Lubman DM, Liu YH, Absalon-Medina V, Hayrabedyan S, Todorova K, Gilbert RO, Guingab J, Barder TJ. Insight into PreImplantation Factor (PIF*) mechanism for embryo protection and development: target oxidative stress and protein misfolding (PDI and HSP) through essential RIKP [corrected] binding site. PLoS One 2014; 9:e100263. [PMID: 24983882 PMCID: PMC4077574 DOI: 10.1371/journal.pone.0100263] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Accepted: 05/24/2014] [Indexed: 11/18/2022] Open
Abstract
Background Endogenous PIF, upon which embryo development is dependent, is secreted only by viable mammalian embryos, and absent in non-viable ones. Synthetic PIF (sPIF) administration promotes singly cultured embryos development and protects against their demise caused by embryo-toxic serum. To identify and characterize critical sPIF-embryo protein interactions novel biochemical and bio-analytical methods were specifically devised. Methods FITC-PIF uptake/binding by cultured murine and equine embryos was examined and compared with scrambled FITC-PIF (control). Murine embryo (d10) lysates were fractionated by reversed-phase HPLC, fractions printed onto microarray slides and probed with Biotin-PIF, IDE and Kv1.3 antibodies, using fluorescence detection. sPIF-based affinity column was developed to extract and identify PIF-protein interactions from lysates using peptide mass spectrometry (LC/MS/MS). In silico evaluation examined binding of PIF to critical targets, using mutation analysis. Results PIF directly targets viable cultured embryos as compared with control peptide, which failed to bind. Multistep Biotin-PIF targets were confirmed by single-step PIF-affinity column based isolation. PIF binds protein disulfide isomerases a prolyl-4-hydroxylase β-subunit, (PDI, PDIA4, PDIA6-like) containing the antioxidant thioredoxin domain. PIF also binds protective heat shock proteins (70&90), co-chaperone, BAG-3. Remarkably, PIF targets a common RIPK site in PDI and HSP proteins. Further, single PIF amino acid mutation significantly reduced peptide-protein target bonding. PIF binds promiscuous tubulins, neuron backbones and ACTA-1,2 visceral proteins. Significant anti-IDE, while limited anti-Kv1.3b antibody-binding to Biotin-PIF positive lysates HPLC fractions were documented. Conclusion Collectively, data identifies PIF shared targets on PDI and HSP in the embryo. Such are known to play a critical role in protecting against oxidative stress and protein misfolding. PIF-affinity-column is a novel utilitarian method for small molecule targets direct identification. Data reveals and completes the understanding of mechanisms involved in PIF-induced autotrophic and protective effects on the embryo.
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Affiliation(s)
- Eytan R. Barnea
- Research & Development, SIEP The Society for the Investigation of Early Pregnancy, Cherry Hill, New Jersey, United States of America
- Research & Development, BioIncept, LLC, Cherry Hill, New Jersey, United States of America
- Department of Obstetrics, Gynecology and Reproduction, UMDNJ-Robert Wood Johnson Medical School, Camden, New Jersey, United States of America
- * E-mail:
| | - David M. Lubman
- Department Surgery, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
| | - Yan-Hui Liu
- Department Surgery, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
| | - Victor Absalon-Medina
- Reproductive Medicine, Cornell University, College of Veterinary Medicine, Ithaca, New York, United States of America
| | - Soren Hayrabedyan
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Krassimira Todorova
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Robert O. Gilbert
- Reproductive Medicine, Cornell University, College of Veterinary Medicine, Ithaca, New York, United States of America
| | - Joy Guingab
- Chemical Biology and Proteomics, Banyan Biomarkers, Alachua, Florida, United States of America
| | - Timothy J. Barder
- Research & Development, Eprogen, Downers Grove, Illinois, United States of America
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Barnea ER, Rambaldi M, Paidas MJ, Mecacci F. Reproduction and autoimmune disease: important translational implications from embryo–maternal interaction. Immunotherapy 2013; 5:769-80. [DOI: 10.2217/imt.13.59] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Pregnancy and autoimmune disorders (ADs) coexist in a delicate balance. Whereas women are disproportionately affected by ADs – frequently occurring during reproductive years – the disease often improves during pregnancy, unless severe. However, when ADs are at an advanced stage, both mother and fetus can be severely affected. Maternal AD amelioration reduces fetal morbidity/mortality. AD improvement occurs without compromising immune tolerance for the fetus; however, it is short-lived since postpartum, flare-up frequently occurs. Consequences of pregnancy-related maternal disease can have life-long impact. Pregnancy is not an immune-suppressed state, but rather a controlled inflammatory environment with distinct local and systemic coordination. Pregnancy requires a delicate immune balance; the embryo/allograft does not cause graft-versus-host disease while the mother/host immunity is modulated without suppression. We herein critically examine the synergetic reciprocal relationship between pregnancy and ADs. We review key ADs and their current prognosis and management. Finally, we describe PreImplantation Factor, a peptide secreted by viable embryos that, beyond its essential autotrophic and proimplantation properties, regulates systemic immune response and also proved effective in nonpregnant autoimmune and transplantation models. Hence, PreImplantation Factor may have a key role in improving ADs in pregnancy, and provide a novel drug for treatment of immune disorders in general.
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Affiliation(s)
- Eytan R Barnea
- Society for the Investigation of Early Pregnancy, Cherry Hill, NJ, USA
- BioIncept, LLC, Cherry Hill, NJ, USA
- Department of Obstetrics & Gynecology, University of Medicine and Dentistry of New Jersey – Robert Wood Johnson Medical School, Camden, NJ, USA
| | - Mariana Rambaldi
- Department of Obstetrics and Gynecology University of Firenze, Florence, Italy
| | - Michael J Paidas
- Yale Women and Children’s Center for Blood Disorders, Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Federico Mecacci
- Department of Obstetrics and Gynecology University of Firenze, Florence, Italy
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Barnea ER, Kirk D, Ramu S, Rivnay B, Roussev R, Paidas MJ. PreImplantation Factor (PIF) orchestrates systemic antiinflammatory response by immune cells: effect on peripheral blood mononuclear cells. Am J Obstet Gynecol 2012; 207:313.e1-11. [PMID: 23021695 DOI: 10.1016/j.ajog.2012.07.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 07/03/2012] [Accepted: 07/11/2012] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Embryo-derived PreImplantation Factor (PIF) is essential for pregnancy immune modulation and synthetic PIF (sPIF), reverses neuroinflammation, and prevents diabetes mellitus through its immune modulatory properties. Herein, we explore sPIF's systemic effects on peripheral blood mononuclear cells (PBMCs). STUDY DESIGN sPIF's effects on PBMCs and subset populations from nonpregnant patients (n = 7) and male patients were evaluated by the assessment of binding characteristics, mixed lymphocyte reaction, proliferation, cytokine secretion, and associated gene expression. Data analysis was by analysis of variance (P < .05). RESULTS Fluorescein isothiocyanate-sPIF bound all myelomonocytic cells; binding was 30-fold up-regulated in mitogen-activated T and B cells (P < .05). sPIF decreased mixed lymphocyte reaction by 70% and blocked anti-CD3 antibody stimulated-PBMC proliferation by approximately 80% (P < .05). In naïve PBMCs, sPIF reduced interleukin (IL)-10 and -2; in activated PBMCs, sPIF increased IL-4, -5, -10, and -2, tumor necrosis factor-α, interferon-γ, and granulocyte-macrophage colony-stimulating factor (P < .05). CONCLUSION Physiologic concentrations of PIF exert potent systemic antiinflammatory effects on nonpregnant activated immune cells.
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Affiliation(s)
- Eytan R Barnea
- Society for the Investigation of Early Pregnancy and BioIncept, LLC, Cherry Hill, NJ, USA.
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Barnea ER, Kirk D, Paidas MJ. Preimplantation factor (PIF) promoting role in embryo implantation: increases endometrial integrin-α2β3, amphiregulin and epiregulin while reducing betacellulin expression via MAPK in decidua. Reprod Biol Endocrinol 2012; 10:50. [PMID: 22788113 PMCID: PMC3444419 DOI: 10.1186/1477-7827-10-50] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Accepted: 07/02/2012] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Viable embryos secrete preimplantation factor (PIF), a peptide that has autocrine effects where levels correlate with cultured embryos development. sPIF (PIF synthetic analog) promotes implantation by regulating decidual-cells immunity, adhesion, apoptosis and enhances trophoblastic cell invasion. Herein sPIF priming effects on non-decidualized endometrium and decidualized-stroma are investigated, assessing elements critical for effective embryo-maternal cross-talk, prior to and at implantation. METHODS We tested sPIF effect on human non-pregnant endometrial epithelial and non-decidualized stroma α2β3 integrin expression (IHC and flow cytometry), comparing with scrambled PIF (PIFscr-control). We examined sPIF effect on decidualized non-pregnant human endometrial stromal cells (HESC) determining pro-inflammatory mediators expression and secretion (ELISA) and growth factors (GFs) expression (Affymetrix global gene array). We tested sPIF effect on HESC Phospho-kinases (BioPlex) and isolated kinases activity (FastKinase). RESULTS sPIF up-regulates α2β3 integrin expression in epithelial cells, (P < 0.05) while PIFscr had no effect. In contrast, in stromal cell cultures sPIF had no effect on the same. In HESC, sPIF up-regulates pro-inflammatory cytokines; IL8, IL1β and IL6 expression. The major increase in GRO-α, ICAM-1 and MCP-3 expression is coupled with same ligands secretion (P < 0.05). sPIF modulates in HESC GFs expression: up-regulates amphiregulin and epiregulin- critical for implantation and enhances several fibroblast growth factors (FGF) relevant for decidual function. In contrast, sPIF down-regulates major pro-proliferative ligands, betacellulin and IGF1 expression. sPIF modulatory effect on GFs is exerted by down-regulating pro-proliferative phospho-activated MAPkinases, p-MEK1 and p-ERK (P < 0.01, P < 0.04, respectively). Stress-induced p-38-MAPK (P = 0.04) and c-Jun kinase signaling involved MAPK8IP2 (-2.1 fold) expression decreased which protects against reactive oxygen species. Although pro-inflammatory p-NFkB (P = 0.06) decrease was mild, its promoter TNFRS11 expression markedly (-25-fold) decreased. In contrast, anti-proliferative phosphatases PTPRZ1 and PPP2R2C expression increased. CONCLUSIONS sPIF post-fertilization primes endometrial-epithelium, while during implantation creates a beneficial pro-inflammatory milieu. PIF acts by balancing decidual pro-implantation properties while controlling excessive pro-proliferative and inflammatory signals expression. Overall, PIF influences critical peri-implantation events in a sequential coordinated fashion which facilitates embryo implantation.
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Affiliation(s)
- Eytan R Barnea
- SIEP - Society for the Investigation of Early Pregnancy, 1697 Lark Lane, Cherry Hill, NJ, 08003, USA
- BioIncept LLC, 1697 Lark Lane, Cherry Hill, NJ, 08003, USA
- Department of Obstetrics & Gynecology, University of Medicine and Dentistry of New Jersey- Robert Wood Johnson Medical School, Camden, NJ, USA
| | | | - Michael J Paidas
- Yale Women and Children’s Center for Blood Disorders, Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, 333 Cedar St, PO Box 208063, New Haven, CT, 06520, USA
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Nimbkar-Joshi S, Katkam RR, Chaudhari UK, Jacob S, Manjramkar DD, Metkari SM, Hinduja I, Mangoli V, Desai S, Kholkute SD, Puri CP, Sachdeva G. Endometrial epithelial cell modifications in response to embryonic signals in bonnet monkeys (Macaca radiata). Histochem Cell Biol 2012; 138:289-304. [DOI: 10.1007/s00418-012-0951-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/27/2012] [Indexed: 10/28/2022]
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Weiss L, Or R, Jones RC, Amunugama R, JeBailey L, Ramu S, Bernstein SA, Yekhtin Z, Almogi-Hazan O, Shainer R, Reibstein I, Vortmeyer AO, Paidas MJ, Zeira M, Slavin S, Barnea ER. Preimplantation Factor (PIF*) reverses neuroinflammation while promoting neural repair in EAE model. J Neurol Sci 2012; 312:146-57. [DOI: 10.1016/j.jns.2011.07.050] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 07/26/2011] [Accepted: 07/28/2011] [Indexed: 01/04/2023]
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A genomic and proteomic investigation of the impact of preimplantation factor on human decidual cells. Am J Obstet Gynecol 2010; 202:459.e1-8. [PMID: 20452489 DOI: 10.1016/j.ajog.2010.03.024] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Revised: 02/16/2010] [Accepted: 03/11/2010] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Preimplantation factor (PIF) is a novel, 15 amino acid peptide, secreted by viable embryos. This study aims to elucidate PIF's effects in human endometrial stromal cells (HESC) decidualized by estrogen and progestin, which mimics the preimplantation milieu, and in first-trimester decidua cultures (FTDC). STUDY DESIGN HESC or FTDC were incubated with 100 nmol/L synthetic PIF or vehicle control. Global gene expression was analyzed using microarray and pathway analysis. Proteins were analyzed using quantitative mass spectrometry, and PIF binding by protein array. RESULTS Gene and proteomic analysis demonstrate that PIF affects immune, adhesion, and apoptotic pathways. Significant up-regulation in HESC (fold change) include: nuclear factor-k-beta activation via interleukin-1 receptor-associated kinase binding protein 1 (53); Toll-like receptor 5 (9); FK506 binding protein 15, 133kDa protein (2.3); and Down syndrome cell adhesion molecule like 1 (16). B-cell lymphoma protein 2 was down-regulated in HESC (21.1) and FTDC (27.1). Protein array demonstrates PIF interaction with intracellular targets insulin-degrading enzyme and beta-K+ channels. CONCLUSION PIF displays essential multitargeted effects, of regulating immunity, promoting embryo-decidual adhesion, and regulating adaptive apoptotic processes.
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Abstract
Pregnancy is a unique immune state in which both mother and embryo/fetus tolerate and interact with one another through term, without interfering with the mother's native immunity. When the embryo is viable, it initiates maternal immune tolerance (IT)--ut not immune suppression. The balance is complex: some immune disorders are ameliorated during pregnancy, despite the presence of an "inflammatory" environment. We have identified a pregnancy viability biomarker--preimplantation factor (PIF)--secreted only by viable embryos, which helps to initiate this maternal tolerance and uterine receptivity. Using anti-PIF antibodies, we have detected PIF in the fetus and placenta. Beyond enhancing uterine receptivity locally, PIF has also been detected in maternal circulation, and may promote peripheral tolerance. In the fetus, PIF may help avoid a "graft-versus-host"-type reaction PIF exhibits unique potent immune-modulatory effects and its synthetic analogue has been shown to exert significant protection in diverse immune scenarios. Nontoxic, low-dose, short-term PIF administration has led to long-term effects in preclinical models of multiple sclerosis (MS), juvenile diabetes mellitus (JDM), and graft-versus-host disease (GVHD), in a manner enabling its translation into a clinical setting. Further investigation of this compound is warranted.
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Affiliation(s)
- Eytan R Barnea
- Society for the Investigation of Early Pregnancy, 1697 Lark Lane, Cherry Hill, NJ 08003, USA.
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Barnea ER. Signaling between embryo and mother in early pregnancy: Basis for development of tolerance. RECURRENT PREGNANCY LOSS 2007. [DOI: 10.3109/9780203931677.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Affiliation(s)
- Eytan R Barnea
- UMDNJ/RWJMS, Society for the Investigation of Early Pregnancy, Camden, NJ, USA.
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Abstract
Embryogenesis can be paralleled and contrasted with cancerous cell proliferation; both embryogenesis and cancer are associated with extremely rapid cell proliferation. However, unlike cancer, embryogenesis is characterized by a delicate balance of proliferative and anti-proliferative processes. We have found two chromatographically separated fractions derived from human embryonal neural tissue extracts that significantly suppress the proliferation of human breast cancer cells. The reduction in cell number was time dependent, with maximal inhibition (70%) observed after 4 days of incubation while maintaining cell viability. The anti-proliferative effect was also evidenced by decreased [3H]-thymidine incorporation. Significant inhibition of proliferation of osteosarcoma, fibrosarcoma, and Balb/c 3T3 cell lines was also obtained with a low concentration of the active fractions. Embryonal factors inhibited mouse and rat cell lines, indicating cross-species effectiveness. The SDS-PAGE of the biologically active approximately 10.7 kDa region revealed several protein bands, while the biologically active approximately 4.5 kDa fraction contained only weakly stainable bands. Thus, the embryo contains factors that control the proliferation of malignant cells. These potent and possibly novel compounds should be investigated for their potential therapeutic role in cancer and other proliferative disorders.
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Affiliation(s)
- E R Barnea
- Biospectrum Medical Corporation, Cherry Hill, New Jersey, USA
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Roussev RG, Coulam CB, Barnea ER. Development and validation of an assay for measuring preimplantation factor (PIF) of embryonal origin. Am J Reprod Immunol 1996; 35:281-7. [PMID: 8962662 DOI: 10.1111/j.1600-0897.1996.tb00046.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
PROBLEM Tests to determine presence of embryos prior to implantation are needed. METHODS Sera from women after embryo transfer were tested for preimplantation factor (PIF) using the lymphocyte/platelet binding assay. Autorosettes were counted using blood type O+ donor lymphocytes and platelets incubated with blinded serum in the presence of antiCD2 antibody and rabbit complement. Human chorion gonadotropin (hCG) concentrations were determined 7 days later and compared with results of the lymphocyte/platelet assay. Implantation was confirmed by ultrasonographic evidence of presence of an intrauterine gestational sac. The roles of platelet activating factor (PAF) and chaperonin 10 in the observed phenomena were studied experimentally. RESULTS Significantly more lymphocyte/platelet rosette formations were observed when sera from women who successfully implanted were compared to sera from women who failed to implant. Neither PAF nor chaparonin added to the tested sera controls influenced the percentage of lymphocyte/platelets rosettes. CONCLUSIONS PIF is a likely candidate to be the next frontier of diagnosing the presence of viable preimplantation embryos in vivo.
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Affiliation(s)
- R G Roussev
- Reproductive Immunology, Genetics and IVF Institute, Fairfax, VA 22031, USA
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19
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Coulam CB, Roussev RG, Thomason EJ, Barnea ER. Preimplantation factor (PIF) predicts subsequent pregnancy loss. Am J Reprod Immunol 1995; 34:88-92. [PMID: 8526994 DOI: 10.1111/j.1600-0897.1995.tb00923.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
PROBLEM To evaluate the ability of preimplantation factor (PIF) measured in the lymphocyte/platelet binding assay (LPBA) to predict subsequent spontaneous abortion. METHOD Serum from 57 women experiencing first trimester pregnancy losses were studied using the LPBA (46 women conceived after in vitro fertilization and embryo transfer for treatment of infertility and 11 with a history of unexplained recurrent spontaneous abortion conceived spontaneously). The assay employs a combination of heat inactivated sera with donor O+ lymphocytes and platelets, complement and an antibody against CD2. Chromosome analysis was performed on 32 of the abortuses. Results of PIF assay were compared between karyotypically normal and abnormal abortuses. RESULTS PIF assay was negative in all 57 women at the time of abortion. Among 12 karyotypically normal abortuses only 1 woman (8%) had an initial positive PIF, 11 (92%) had negative PIF. Serial PIF assays were performed on 15 women. PIF assay became negative a minimum of two weeks prior to demonstration of intrauterine demise at a time when hCG concentrations remained elevated. A trend to subnormal was seen in women with normal when compared to those with abnormal abortus karyotype, but the numbers were too small to reach statistical significance (P = 0.09). CONCLUSION Measurement of PIF throughout the first trimester of pregnancy predicts subsequent pregnancy loss.
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Affiliation(s)
- C B Coulam
- Genetics & IVF Institute, Fairfax, VA 22031, USA
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Roussev RG, Barnea ER, Thomason EJ, Coulam CB. A novel bioassay for detection of preimplantation factor (PIF). Am J Reprod Immunol 1995; 33:68-73. [PMID: 7619236 DOI: 10.1111/j.1600-0897.1995.tb01140.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
PROBLEM To identify the presence of vital preimplantation embryos in vivo in humans, a newly observed phenomenon based on autorosette formation between lymphocytes and platelets, when treated with pregnant sera, was used as a marker. METHOD Serum samples were obtained from 65 patients on the fourth day after embryo transfer (ET). Sera from 10 healthy males and 47 nonpregnant women were used as controls. The preimplantation factor (PIF) was detected by using blood group O+ donor lymphocytes and platelets incubated with blinded serum in the presence of anti-CD2 antibody and rabbit complement. Human chorion gonadotropin (hCG) concentrations were determined 7 days later and compared with results of the lymphocyte-platelets assay. Implantation was confirmed by ultrasonographic evidence of presence of an intrauterine gestational sac. The role of platelet activating factor (PAF) in the observed phenomena was studied experimentally. RESULTS Significantly more lymphocyte-platelet rosette formations were observed when sera from women who successfully implanted were compared to sera from women who failed to implant. This assay yielded a specificity of 95%, sensitivity of 88%, positive predictive value of 94%, and negative predictability of 90%. PAF added directly to the cell suspension and tested sera controls did not influence the percentage of lymphocyte/platelets rosettes. CONCLUSION The application of PIF assay will enable the identification and study of early pregnancy events before the implantation occur. PAF by itself is not responsible for the rosette formation.
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Affiliation(s)
- R G Roussev
- Genetics & IVF Institute, Fairfax, Virginia 22031, USA
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