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Spencer NR, Radnaa E, Baljinnyam T, Kechichian T, Tantengco OAG, Bonney E, Kammala AK, Sheller-Miller S, Menon R. Development of a mouse model of ascending infection and preterm birth. PLoS One 2021; 16:e0260370. [PMID: 34855804 PMCID: PMC8638907 DOI: 10.1371/journal.pone.0260370] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 11/08/2021] [Indexed: 11/18/2022] Open
Abstract
Background Microbial invasion of the intraamniotic cavity and intraamniotic inflammation are factors associated with spontaneous preterm birth. Understanding the route and kinetics of infection, sites of colonization, and mechanisms of host inflammatory response is critical to reducing preterm birth risk. Objectives This study developed an animal model of ascending infection and preterm birth with live bacteria (E. coli) in pregnant CD-1 mice with the goal of better understanding the process of microbial invasion of the intraamniotic cavity and intraamniotic inflammation. Study design Multiple experiments were conducted in this study. To determine the dose of E. coli required to induce preterm birth, CD-1 mice were injected vaginally with four different doses of E. coli (103, 106, 1010, or 1011 colony forming units [CFU]) in 40 μL of nutrient broth or broth alone (control) on an embryonic day (E)15. Preterm birth (defined as delivery before E18.5) was monitored using live video. E. coli ascent kinetics were measured by staining the E. coli with lipophilic tracer DiD for visualization through intact tissue with an in vivo imaging system (IVIS) after inoculation. The E. coli were also directly visualized in reproductive tissues by staining the bacteria with carboxyfluorescein succinimidyl ester (CFSE) prior to administration and via immunohistochemistry (IHC) by staining tissues with anti-E. coli antibody. Each pup’s amniotic fluid was cultured separately to determine the extent of microbial invasion of the intraamniotic cavity at different time points. Intraamniotic inflammation resulting from E. coli invasion was assessed with IHC for inflammatory markers (TLR-4, P-NF-κB) and neutrophil marker (Ly-6G) for chorioamnionitis at 6- and 24-h post-inoculation. Results Vaginally administered E. coli resulted in preterm birth in a dose-dependent manner with higher doses causing earlier births. In ex vivo imaging and IHC detected uterine horns proximal to the cervix had increased E. coli compared to the distal uterine horns. E. coli were detected in the uterus, fetal membranes (FM), and placenta in a time-dependent manner with 6 hr having increased intensity of E. coli positive signals in pups near the cervix and in all pups at 24 hr. Similarly, E. coli grew from the cultures of amniotic fluid collected nearest to the cervix, but not from the more distal samples at 6 hr post-inoculation. At 24 hr, all amniotic fluid cultures regardless of distance from the cervix, were positive for E. coli. TLR-4 and P-NF-κB signals were more intense in the tissues where E. coli was present (placenta, FM and uterus), displaying a similar trend toward increased signal in proximal gestational sacs compared to distal at 6 hr. Ly-6G+ cells, used to confirm chorioamnionitis, were increased at 24 hr compared to 6 hr post-inoculation and control. Conclusion We report the development of mouse model of ascending infection and the associated inflammation of preterm birth. Clinically, these models can help to understand mechanisms of infection associated preterm birth, determine targets for intervention, or identify potential biomarkers that can predict a high-risk pregnancy status early in pregnancy.
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Affiliation(s)
- Nicholas R. Spencer
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Enkhtuya Radnaa
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Tuvshintugs Baljinnyam
- Department of Pharmacology and Toxicology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Talar Kechichian
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Ourlad Alzeus G. Tantengco
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
- Department of Biochemistry and Molecular Biology, College of Medicine, University of the Philippines Manila, Manila, Philippines
| | - Elizabeth Bonney
- Department of Obstetrics and Gynecology, University of Vermont, Burlington, VT, United States of America
| | - Ananth Kumar Kammala
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Samantha Sheller-Miller
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Ramkumar Menon
- Division of Maternal-Fetal Medicine and Perinatal Research, Department of Obstetrics and Gynecology, The University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
- * E-mail:
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Lavu N, Richardson L, Radnaa E, Kechichian T, Urrabaz-Garza R, Sheller-Miller S, Bonney E, Menon R. Oxidative stress-induced downregulation of glycogen synthase kinase 3 beta in fetal membranes promotes cellular senescence†. Biol Reprod 2020; 101:1018-1030. [PMID: 31292604 DOI: 10.1093/biolre/ioz119] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/30/2019] [Accepted: 07/08/2019] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Oxidative stress (OS)-induced stress signaler p38 mitogen-activated protein kinase (p38MAPK) activation and fetal membrane senescence are associated with parturition. This study determined changes in glycogen synthase kinase 3 beta (GSK3β) and its regulation by p38MAPK in effecting senescence to further delineate the molecular mechanism involved in senescence. METHODS Primary human amnion epithelial cells and amnion mesenchymal cells were treated with cigarette smoke extract (CSE, OS inducer). Expression of total and phosphorylated GSK3β and p38MAPK, and that of GSK3β's downstream targets: beta-catenin (β-Cat) and nuclear factor erythroid 2-related factor 2 (Nrf2) (western blot analysis), cell cycle regulation and senescence (flow cytometry) were determined. The specificity of GSK3β and p38MAPK's mechanistic role was tested by co-treating cells with their respective inhibitors, CHIR99021 and SB203580. Exosomal secretion of β-Cat from OS-induced cells was confirmed by immunofluorescence confocal microscopy and western blot. RESULTS OS induced by CSE resulted in phosphorylation of GSK3β (inactivation) and p38MAPK (activation) that was associated with cell cycle arrest and senescence. Inhibitors to GSK3β and p38MAPK verified their roles. Glycogen synthase kinase 3 beta inactivation was associated with nuclear translocation of antioxidant Nrf2 and exosomal secretion of β-Cat. CONCLUSIONS OS-induced P-p38MAPK activation is associated with functional downregulation of GSK3β and arrest of cell cycle progression and senescence of amnion cells. Lack of nuclear translocation of β-Cat and its excretion via exosomes further supports the postulation that GSK3β down-regulation by p38MAPK may stop cell proliferation preceding cell senescence. A better understanding of molecular mechanisms of senescence will help develop therapeutic strategies to prevent preterm birth.
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Affiliation(s)
- Narmada Lavu
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA.,Department of Neuroscience, Cell Biology & Anatomy, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Lauren Richardson
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA.,Department of Neuroscience, Cell Biology & Anatomy, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Enkhtuya Radnaa
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Talar Kechichian
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Rheanna Urrabaz-Garza
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Samantha Sheller-Miller
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Elizabeth Bonney
- Department of Obstetrics and Gynecology, University of Vermont, Burlington, Vermont, USA
| | - Ramkumar Menon
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, The University of Texas Medical Branch at Galveston, Galveston, Texas, USA
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Singh N, Bonney E, McElrath T, Lamont RF. Prevention of preterm birth: Proactive and reactive clinical practice-are we on the right track? Placenta 2020; 98:6-12. [PMID: 32800387 DOI: 10.1016/j.placenta.2020.07.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 11/27/2022]
Abstract
Preterm birth remains the major cause of death and disability among children under the age of five. In developing countries antenatal preterm birth prevention clinics are set up to provide cervical length surveillance and/or treatment modalities such as cerclage or progesterone for those women with identified risk factors such as previous cervical treatment or preterm birth. However, 85% of women have no risk factors for PTB and currently there is no biomarker to screen women early in pregnancy. Women will present unexpectedly in threatened preterm labour and we have no choice but to adopt a re-active approach to their care by using predication and preparation strategies such as fetal fibronectin, tocolytic therapy and steroids. Despite these strategies approximately 15-20% of these women will give birth preterm before 34 weeks. There is a urgent need to re-design primary, secondary and tertiary prevention strategies for spontaneous preterm labour (sPTL) in singleton pregnancies aimed at identifying and addressing key gaps in clinical practice and research.
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Affiliation(s)
- Natasha Singh
- Department of Obstetrics, Chelsea and Westminster Hospital and Imperial College London, UK.
| | - Elizabeth Bonney
- Department of Obstetrics, Gynaecology, and Reproductive Sciences, University of Vermont, Burlington, VT, USA
| | - Tom McElrath
- Brigham and Women's Hospital, Department of Obstetrics and Gynaecology, Boston, MA, USA
| | - Ronald F Lamont
- Division of Surgery, University College London, Northwick Park Institute of Medical Research Campus, London, UK
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Lavu N, Richardson L, Bonney E, Menon R. Glycogen synthase kinase (GSK) 3 in pregnancy and parturition: a systematic review of literature. J Matern Fetal Neonatal Med 2019; 33:1946-1957. [PMID: 30278798 DOI: 10.1080/14767058.2018.1531843] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Introduction: Multiple factors and pathways have been reported as critical machineries for cell differentiation and survival during pregnancy; a number of them involve glycogen synthase kinase (GSK) 3a/β. Several reports on GSK3's functional role exist; however, the specific role of GSK3 in reproductive tissues and its contribution to normal or abnormal parturition are still unclear. To fill this knowledge gap, a systematic review of literature was conducted to better understand the functional role of GSK3 in various intrauterine tissues during implantation, pregnancy, and parturition.Methods: We conducted a systematic review of literature on GSK3's expression and function reported between 1980 and 2017 in reproductive tissues during pregnancy using three electronic databases (Web of Science, Medline, and ClinicalTrials.gov). Study selection, data extraction, quality assessment and analyses were performed in duplicate by two independent reviewers.Results: A total of 738 citations were identified; 80 were selected for full text evaluation and 25 were included for final review. GSK3's regulation and function were mostly studied in tissues and cells from placentas (12), fetuses (8), uteruses (6), and ovaries (2). GSK3 is primarily reported as a downstream responder of protein kinase B (AKT)-, Wnt-, and reactive oxygen species (ROS)-related pathways where it plays a critical role in cell survival and growth in reproductive tissues.Conclusions: Though GSK3 has been functionally linked to a number of biological processes in reproductive tissues, it has primarily been studied as a secondary signaler of various conserved cell signaling pathways. Lack of scientific rigor in studying GSK3's role in reproductive tissues makes this molecule's function still obscure. No studies have reported GSK3 in the cervix, and very few reports exist in myometrium and decidua. This systematic review suggests more functional and mechanistic studies focusing on GSK3 need to be conducted in reproductive biology.
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Affiliation(s)
- Narmada Lavu
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, the University of Texas Medical Branch at Galveston, Galveston, Texas, USA.,Department of Neuroscience, Cell Biology & Anatomy, the University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Lauren Richardson
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, the University of Texas Medical Branch at Galveston, Galveston, Texas, USA
| | - Elizabeth Bonney
- Department of Obstetrics and Gynecology, University of Vermont, Burlington, Vermont, USA
| | - Ramkumar Menon
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine & Perinatal Research, the University of Texas Medical Branch at Galveston, Galveston, Texas, USA
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Nott J, Pervolaraki E, Benson A, Bonney E, Pickering J, Wilkinson N, Walker J, Simpson N. 135: High field strength small bore magnetic resonance imaging identifies dense, organized, encircling fibers at the cervical internal os. Am J Obstet Gynecol 2017. [DOI: 10.1016/j.ajog.2016.11.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Fukagawa N, Jetton T, Peshavaria M, Bonney E, Poynter M, Holmen B. Sex‐Specific Metabolic Alterations in Offspring of Mice Exposed Prenatally to Particulate Matter (PM) from Petrodiesel (PD) Combustion. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | - Britt Holmen
- Schl of Engineering U VermontBurlingtonVTUnited States
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Bonney E, Shepard M. Title: PD-1 regulates T cell proliferation in a tissue and subset specific manner during normal mouse pregnancy (122.11). The Journal of Immunology 2012. [DOI: 10.4049/jimmunol.188.supp.122.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The regulation of T cell homeostasis during pregnancy has important implications for maternal tolerance and immunity. Evidence suggests that Programmed Death-1 (PD-1) participates in regulation of T cell homeostasis and peripheral tolerance. To examine the contribution of PD-1 signaling on T cell homeostasis during normal mouse pregnancy, we examined T cell number or proportion, PD-1 expression, proliferation, and apoptosis by flow cytometry, BrdU incorporation, and TUNEL assay in pregnant mice given anti-PD-1 blocking antibody or control on days 10, 12, and 14 of gestation. We observed tissue, treatment, and T cell-specific differences in PD-1 expression. Both pregnancy and PD-1 blockade increased T cell proliferation in the spleen while this effect was limited to CD4 T cells in the uterine- draining nodes. In the uterus, PD-1 blockade markedly altered the composition of the T cell pool. These studies support the idea that pregnancy is a state of dynamic T cell homeostasis and suggest that this state is partially supported by PD-1 signaling.
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Affiliation(s)
- Elizabeth Bonney
- 1Obstetrics, Gynecology, and Reproductive Sciences, University of Vermont, Burlington, VT
| | - Michelle Shepard
- 1Obstetrics, Gynecology, and Reproductive Sciences, University of Vermont, Burlington, VT
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Feltovich H, Ji H, Carroll C, Janowski J, Bonney E, Chien E. EP4 receptor activation produces quantifiable decrease in cervical collagen content. Am J Obstet Gynecol 2004. [DOI: 10.1016/j.ajog.2004.09.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
Several major news stories in the past year have highlighted adverse events in Canadian healthcare and prompted questions about whether healthcare in Canada is safe and what is being done to improve it. While individual hospitals and regions are mounting patient safety efforts, these problems are systemic and require policy and organizational responses from governments and health regions, not just individual organizations.
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Lantz O, Bonney E, Griscelli F, Taoufik Y. Kinetic Quantitative PCR vs End-Point Quantitative PCR with Internal Standard. Methods Mol Med 1999; 26:87-102. [PMID: 21340871 DOI: 10.1385/0-89603-518-2:87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Quantitative PCR can be done either by measuring the amount of PCR products at a given number of cycle (end-point quantitative PCR) (1-4) or by following the amount of products during the PCR at several cycles (kinetic quantitative PCR) (5,6). In this chapter, we define these two quantitative PCR methods, give their main characteristics, and compare their advantages and drawbacks. We then give a few examples of applications of the kinetic PCR method we have been using during the past few years.
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Affiliation(s)
- O Lantz
- Inserm Unit, Necker Hospital, Paris, France
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Fong LG, Bonney E, Kosek JC, Cooper AD. Immunohistochemical localization of low density lipoprotein receptors in adrenal gland, liver, and intestine. J Clin Invest 1989; 84:847-56. [PMID: 2760216 PMCID: PMC329728 DOI: 10.1172/jci114245] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The localization of LDL receptors in adrenal gland, liver, and intestine was studied using immunohistochemistry. The anti-LDL receptor antibody used was shown to be monospecific and did not react with striated muscle, a tissue which has a very low level of LDL receptors. Similarly, cerebral cortex showed only faint reactivity and that was to an area previously demonstrated to have LDL receptors. Adrenal gland was intensely reactive with the zona fasciculata, having a greater density of receptors than the zona reticularis. In normal liver, LDL receptors were present on the sinusoidal membranes and were sparse in the areas of hepatocyte-to-hepatocyte contact without an obvious portal to central gradient. LDL receptors were present throughout the intestine. In jejunum, staining was most intense at the base of the villus and extended up toward the villus tip. At the base of the villus, the receptor was primarily at the basal lateral membrane, but toward the villus tip, there was appreciable intracellular staining. Staining in crypts was more faint; in duodenum, staining in crypts equaled that in the villus region in intensity. In colon, there was intense staining throughout the epithelial cells. These results provide new information about the cellular and subcellular localization of LDL receptors and raise the interesting possibility that there is a role for LDL-derived cholesterol in new lipoprotein formation.
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Affiliation(s)
- L G Fong
- Research Institute, Palo Alto Medical Foundation, California 94301
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