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Camm EJ, Botting KJ, Sferruzzi-Perri AN. Near to One's Heart: The Intimate Relationship Between the Placenta and Fetal Heart. Front Physiol 2018; 9:629. [PMID: 29997513 PMCID: PMC6029139 DOI: 10.3389/fphys.2018.00629] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 05/09/2018] [Indexed: 01/19/2023] Open
Abstract
The development of the fetal heart is exquisitely controlled by a multitude of factors, ranging from humoral to mechanical forces. The gatekeeper regulating many of these factors is the placenta, an external fetal organ. As such, resistance within the placental vascular bed has a direct influence on the fetal circulation and therefore, the developing heart. In addition, the placenta serves as the interface between the mother and fetus, controlling substrate exchange and release of hormones into both circulations. The intricate relationship between the placenta and fetal heart is appreciated in instances of clinical placental pathology. Abnormal umbilical cord insertion is associated with congenital heart defects. Likewise, twin-to-twin transfusion syndrome, where monochorionic twins have unequal sharing of their placenta due to inter-twin vascular anastomoses, can result in cardiac remodeling and dysfunction in both fetuses. Moreover, epidemiological studies have suggested a link between placental phenotypic traits and increased risk of cardiovascular disease in adult life. To date, the mechanistic basis of the relationships between the placenta, fetal heart development and later risk of cardiac dysfunction have not been fully elucidated. However, studies using environmental exposures and gene manipulations in experimental animals are providing insights into the pathways involved. Likewise, surgical instrumentation of the maternal and fetal circulations in large animal species has enabled the manipulation of specific humoral and mechanical factors to investigate their roles in fetal cardiac development. This review will focus on such studies and what is known to date about the link between the placenta and heart development.
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Affiliation(s)
- Emily J Camm
- Department of Physiology, Development and Neuroscience and Centre for Trophoblast Research, University of Cambridge, Cambridge, United Kingdom
| | - Kimberley J Botting
- Department of Physiology, Development and Neuroscience and Centre for Trophoblast Research, University of Cambridge, Cambridge, United Kingdom
| | - Amanda N Sferruzzi-Perri
- Department of Physiology, Development and Neuroscience and Centre for Trophoblast Research, University of Cambridge, Cambridge, United Kingdom
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Mouse maternal protein restriction during preimplantation alone permanently alters brain neuron proportion and adult short-term memory. Proc Natl Acad Sci U S A 2018; 115:E7398-E7407. [PMID: 29941596 DOI: 10.1073/pnas.1721876115] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Maternal protein malnutrition throughout pregnancy and lactation compromises brain development in late gestation and after birth, affecting structural, biochemical, and pathway dynamics with lasting consequences for motor and cognitive function. However, the importance of nutrition during the preimplantation period for brain development is unknown. We have previously shown that maternal low-protein diet (LPD) confined to the preimplantation period (Emb-LPD) in mice, with normal nutrition thereafter, is sufficient to induce cardiometabolic and locomotory behavioral abnormalities in adult offspring. Here, using a range of in vivo and in vitro techniques, we report that Emb-LPD and sustained LPD reduce neural stem cell (NSC) and progenitor cell numbers at E12.5, E14.5, and E17.5 through suppressed proliferation rates in both ganglionic eminences and cortex of the fetal brain. Moreover, Emb-LPD causes remaining NSCs to up-regulate the neuronal differentiation rate beyond control levels, whereas in LPD, apoptosis increases to possibly temper neuron formation. Furthermore, Emb-LPD adult offspring maintain the increase in neuron proportion in the cortex, display increased cortex thickness, and exhibit short-term memory deficit analyzed by the novel-object recognition assay. Last, we identify altered expression of fragile X family genes as a potential molecular mechanism for adverse programming of brain development. Collectively, these data demonstrate that poor maternal nutrition from conception is sufficient to cause abnormal brain development and adult memory loss.
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Gómez Real F, Burgess JA, Villani S, Dratva J, Heinrich J, Janson C, Jarvis D, Koplin J, Leynaert B, Lodge C, Lærum BN, Matheson MC, Norbäck D, Omenaas ER, Skulstad SM, Sunyer J, Dharmage SC, Svanes C. Maternal age at delivery, lung function and asthma in offspring: a population-based survey. Eur Respir J 2018; 51:13993003.01611-2016. [PMID: 29880541 DOI: 10.1183/13993003.01611-2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 04/21/2018] [Indexed: 01/15/2023]
Abstract
There is limited information about potential impact of maternal age on the respiratory health of offspring. We investigated the association of maternal age at delivery with adult offspring's lung function, respiratory symptoms and asthma, and potential differences according to offspring sex.10 692 adults from 13 countries participating in the European Community Respiratory Health Survey (ECRHS) II responded to standardised interviews and provided lung function measurements and serum for IgE measurements at age 25-55 years. In logistic and linear multilevel mixed models we adjusted for participants' characteristics (age, education, centre, number of older siblings) and maternal characteristics (smoking in pregnancy, education) while investigating for differential effects by sex. Maternal age was validated in a subsample using data from the Norwegian birth registry.Increasing maternal age was associated with increasing forced expiratory volume in 1 s (2.33 mL per year, 95% CI 0.34-4.32 mL per year), more consistent in females (ptrend 0.025) than in males (ptrend 0.14). Asthma (OR 0.85, 95% CI 0.79-0.92) and respiratory symptoms (OR 0.87, 95% CI 0.82-0.92) decreased with increasing maternal age (per 5 years) in females, but not in males (pinteraction 0.05 and 0.001, respectively). The results were consistent across centres and not explained by confounding factors.Maternal ageing was related to higher adult lung function and less asthma/symptoms in females. Biological characteristics in offspring related to maternal ageing are plausible and need further investigation.
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Affiliation(s)
- Francisco Gómez Real
- Dept of Clinical Science, University of Bergen, Bergen, Norway.,Dept of Obstetrics and Gynaecology, Haukeland University Hospital, Bergen, Norway
| | - John A Burgess
- Allergy and Lung Health Unit, School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Simona Villani
- Unit of Biostatistics and Clinical Epidemiology, Dept of Public Health, Experimental and Forensic Medicine, University of Pavia, Pavia, Italy
| | - Julia Dratva
- Institute of Social and Preventive Medicine, Swiss Tropical Institute, Basel, Switzerland
| | - Joachim Heinrich
- Molecular Epidemiology, Forschungszentrum für Umwelt und Gesundheit, National Research Center for Environment and Health, Neuherberg, Germany
| | - Christer Janson
- Dept of Medical Sciences, Respiratory: Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
| | - Debbie Jarvis
- Dept of Public Health Sciences, Imperial College, London, UK
| | - Jennifer Koplin
- Allergy and Lung Health Unit, School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Bénédicte Leynaert
- Inserm, UMR 1152, Pathophysiology and Epidemiology of Respiratory Diseases, Paris, France.,University Paris Diderot Paris 7, Paris, France
| | - Caroline Lodge
- Allergy and Lung Health Unit, School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Birger N Lærum
- Dept of Clinical Science, University of Bergen, Bergen, Norway
| | - Melanie C Matheson
- Allergy and Lung Health Unit, School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Dan Norbäck
- Dept of Medical Sciences, Respiratory: Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
| | - Ernst R Omenaas
- Dept of Clinical Science, University of Bergen, Bergen, Norway.,Centre for Clinical Research, Haukeland University Hospital, Bergen, Norway
| | - Svein M Skulstad
- Dept of Clinical Science, University of Bergen, Bergen, Norway.,Dept of Occupational Medicine, Haukeland University Hospital, Bergen, Norway
| | - Jordi Sunyer
- Centre de Recerca Epidemiológica i Ambiental, Barcelona, Spain
| | - Shyamali C Dharmage
- Allergy and Lung Health Unit, School of Population and Global Health, University of Melbourne, Melbourne, Australia.,These authors contributed equally
| | - Cecilie Svanes
- Dept of Occupational Medicine, Haukeland University Hospital, Bergen, Norway.,Centre for International Health, University of Bergen, Bergen, Norway.,These authors contributed equally
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Fleming TP, Watkins AJ, Velazquez MA, Mathers JC, Prentice AM, Stephenson J, Barker M, Saffery R, Yajnik CS, Eckert JJ, Hanson MA, Forrester T, Gluckman PD, Godfrey KM. Origins of lifetime health around the time of conception: causes and consequences. Lancet 2018; 391:1842-1852. [PMID: 29673874 PMCID: PMC5975952 DOI: 10.1016/s0140-6736(18)30312-x] [Citation(s) in RCA: 622] [Impact Index Per Article: 103.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 12/03/2017] [Accepted: 01/31/2018] [Indexed: 12/11/2022]
Abstract
Parental environmental factors, including diet, body composition, metabolism, and stress, affect the health and chronic disease risk of people throughout their lives, as captured in the Developmental Origins of Health and Disease concept. Research across the epidemiological, clinical, and basic science fields has identified the period around conception as being crucial for the processes mediating parental influences on the health of the next generation. During this time, from the maturation of gametes through to early embryonic development, parental lifestyle can adversely influence long-term risks of offspring cardiovascular, metabolic, immune, and neurological morbidities, often termed developmental programming. We review periconceptional induction of disease risk from four broad exposures: maternal overnutrition and obesity; maternal undernutrition; related paternal factors; and the use of assisted reproductive treatment. Studies in both humans and animal models have demonstrated the underlying biological mechanisms, including epigenetic, cellular, physiological, and metabolic processes. We also present a meta-analysis of mouse paternal and maternal protein undernutrition that suggests distinct parental periconceptional contributions to postnatal outcomes. We propose that the evidence for periconceptional effects on lifetime health is now so compelling that it calls for new guidance on parental preparation for pregnancy, beginning before conception, to protect the health of offspring.
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Affiliation(s)
- Tom P Fleming
- Biological Sciences, University of Southampton, Southampton, UK
| | - Adam J Watkins
- School of Medicine, Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, Nottingham, UK
| | - Miguel A Velazquez
- School of Natural and Environmental Sciences, Newcastle University, Newcastle, UK
| | - John C Mathers
- Human Nutrition Research Centre, Institute of Cellular Medicine and Newcastle University Institute for Ageing, Newcastle University, Newcastle, UK
| | - Andrew M Prentice
- MRC Unit, The Gambia and MRC International Nutrition Group, London School of Hygiene & Tropical Medicine, London, UK
| | - Judith Stephenson
- UCL EGA Institute for Women's Health, Faculty of Population Health Sciences, University College London, London, UK
| | - Mary Barker
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK; NIHR Southampton Biomedical Research Centre, University of Southampton & University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Richard Saffery
- Cancer & Disease Epigenetics, Murdoch Children's Research Institute and Department of Paediatrics, University of Melbourne, Melbourne, VIC, Australia
| | | | - Judith J Eckert
- Institute of Developmental Sciences, University of Southampton, Southampton, UK
| | - Mark A Hanson
- Institute of Developmental Sciences, University of Southampton, Southampton, UK; NIHR Southampton Biomedical Research Centre, University of Southampton & University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Terrence Forrester
- University of the West Indies Solutions for Developing Countries, The University of the West Indies, Mona, Jamaica
| | - Peter D Gluckman
- Liggins Institute, University of Auckland, Auckland, New Zealand; Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Keith M Godfrey
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK; Institute of Developmental Sciences, University of Southampton, Southampton, UK; NIHR Southampton Biomedical Research Centre, University of Southampton & University Hospital Southampton NHS Foundation Trust, Southampton, UK.
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55
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Sharpe RM. Programmed for sex: Nutrition–reproduction relationships from an inter-generational perspective. Reproduction 2018; 155:S1-S16. [DOI: 10.1530/rep-17-0537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 12/21/2017] [Indexed: 01/18/2023]
Abstract
Reproduction is our biological reason for being. Our physiology has been shaped via countless millennia of evolution with this one purpose in mind, so that at birth we are ‘programmed for sex’, although this will not kick-start functionally until puberty. Our development from an early embryo is focused on making us fit to reproduce and is intimately connected to nutrition and energy stores. Fluctuations in food supply has probably been a key evolutionary shaper of the reproductive process, and this review hypothesizes that we have developed rapid, non-genomic adaptive mechanisms to such fluctuations to better fit offspring to their perceived (nutritional) environment, thus giving them a reproductive advantage. There is abundant evidence for this notion from ‘fetal programming’ studies and from experimental ‘inter-generational’ studies involving manipulation of parental (especially paternal) diet and then examining metabolic changes in resulting offspring. It is argued that the epigenetic reprogramming of germ cells that occurs during fetal life, after fertilisation and during gametogenesis provides opportunities for sensing of the (nutritional) environment so as to affect adaptive epigenetic changes to alter offspring metabolic function. In this regard, there may be adverse effects of a modern Western diet, perhaps because it is deficient in plant-derived factors that are proven to be capable of altering the epigenome, folate being a prime example; we have evolved in tune with such factors. Therefore, parental and even grandparental diets may have consequences for health of future generations, but how important this might be and the precise epigenetic mechanisms involved are unknown.
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56
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Naturil-Alfonso C, Marco-Jiménez F, Pascual J, Vicente J. Effect of restricted feeding under rearing on reproduction, body condition and blood metabolites of rabbit does selected for growth rate. WORLD RABBIT SCIENCE 2017. [DOI: 10.4995/wrs.2017.6848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Young rabbit females selected for growth rate can have nutritional needs which may not be met by the common practice of feed restriction during rearing in commercial rabbit production. The aim of this study was to analyse the effect of two different feeding programmes: restricted and ad libitum feeding, applied in young rabbit females for one month at the end of rearing, on reproductive performance, body condition and circulating metabolic hormones and metabolites in a rabbit line selected by growth rate in 3 consecutive reproductive cycles. Thus, twenty-four 16-week-old does were randomly assigned to a group in which the daily recommended nutrient intakes were satisfied (fed restricted: 130 g/day, n=13) or a group fed to satiety (ad libitum: 235.5 g/day, n=11) during one month. Then, all does were inseminated in 3 consecutive cycles using a 42-day reproductive cycle. Measurements of does’ body weight, perirenal fat thickness and plasma leptin, non-esterified-fatty-acids (NEFA), beta-hydroxybutyrate (BOHB) and fructosamine were performed at artificial insemination (AI), parturition and weaning time in 3 consecutive cycles. Reproductive performance of does was evaluated based on fertility, litter size at parturition, prolificacy and productivity. Differences in body weight were found only in the 1<sup>st</sup> cycle, ad libitum fed females being heavier than restricted ones. Nevertheless, body weight variances disappeared in later cycles. No differences were found in perirenal fat thickness. Finally, in ad libitum fed females slight differences were found in plasma levels of NEFAs (452 vs. 258 μekv/L and 527 vs. 306 μekv/L for 1<sup>st</sup> and 2<sup>nd</sup> cycles) and BOHB (0.26 vs. 0.03 mM for 2<sup>nd</sup> cycle), but disappeared in the 3<sup>rd</sup> reproductive cycle. Fertility, prolificacy and productivity was not significantly affected by the feeding programme. Nevertheless, total litter size showed to be higher in ad libitum fed females at second parturition (8.7 vs. 5.9 kits). Therefore, the evaluated feeding programmes until first AI in females selected by growth rate had no effect on their reproductive outcomes, as the global reproductive performance was not affected.
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57
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Velazquez MA, Sheth B, Smith SJ, Eckert JJ, Osmond C, Fleming TP. Insulin and branched-chain amino acid depletion during mouse preimplantation embryo culture programmes body weight gain and raised blood pressure during early postnatal life. Biochim Biophys Acta Mol Basis Dis 2017; 1864:590-600. [PMID: 29196239 PMCID: PMC5764225 DOI: 10.1016/j.bbadis.2017.11.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 11/09/2017] [Accepted: 11/26/2017] [Indexed: 02/07/2023]
Abstract
Mouse maternal low protein diet exclusively during preimplantation development (Emb-LPD) is sufficient to programme altered growth and cardiovascular dysfunction in offspring. Here, we use an in vitro model comprising preimplantation culture in medium depleted in insulin and branched-chain amino acids (BCAA), two proposed embryo programming inductive factors from Emb-LPD studies, to examine the consequences for blastocyst organisation and, after embryo transfer (ET), postnatal disease origin. Two-cell embryos were cultured to blastocyst stage in defined KSOM medium supplemented with four combinations of insulin and BCAA concentrations. Control medium contained serum insulin and uterine luminal fluid amino acid concentrations (including BCAA) found in control mothers from the maternal diet model (N-insulin + N-bcaa). Experimental medium (three groups) contained 50% reduction in insulin and/or BCAA (L-insulin + N-bcaa, N-insulin + L-bcaa, and L-insulin + N-bcaa). Lineage-specific cell numbers of resultant blastocysts were not affected by treatment. Following ET, a combined depletion of insulin and BCAA during embryo culture induced a non sex-specific increase in birth weight and weight gain during early postnatal life. Furthermore, male offspring displayed relative hypertension and female offspring reduced heart/body weight, both characteristics of Emb-LPD offspring. Combined depletion of metabolites also resulted in a strong positive correlation between body weight and glucose metabolism that was absent in the control group. Our results support the notion that composition of preimplantation culture medium can programme development and associate with disease origin affecting postnatal growth and cardiovascular phenotypes and implicate two important nutritional mediators in the inductive mechanism. Our data also have implications for human assisted reproductive treatment (ART) practice. Chronic disease may derive from maternal undernutrition during pregnancy, including the periconceptional period. Mouse embryos cultured in medium low in insulin and select amino acids gave rise to offspring with disease symptoms. We propose these metabolite deficiencies around conception induce adverse programming of the early embryo leading to increased disease risk in later life.
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Affiliation(s)
- Miguel A Velazquez
- Biological Sciences, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK; School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - Bhavwanti Sheth
- Biological Sciences, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Stephanie J Smith
- Biological Sciences, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Judith J Eckert
- Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Clive Osmond
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Tom P Fleming
- Biological Sciences, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
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58
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Pérez-Cerezales S, Ramos-Ibeas P, Rizos D, Lonergan P, Bermejo-Alvarez P, Gutiérrez-Adán A. Early sex-dependent differences in response to environmental stress. Reproduction 2017; 155:R39-R51. [PMID: 29030490 DOI: 10.1530/rep-17-0466] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 10/09/2017] [Accepted: 10/12/2017] [Indexed: 12/14/2022]
Abstract
Developmental plasticity enables the appearance of long-term effects in offspring caused by exposure to environmental stressors during embryonic and foetal life. These long-term effects can be traced to pre- and post-implantation development, and in both cases, the effects are usually sex specific. During preimplantation development, male and female embryos exhibit an extensive transcriptional dimorphism mainly driven by incomplete X chromosome inactivation. These early developmental stages are crucial for the establishment of epigenetic marks that will be conserved throughout development, making it a particularly susceptible period for the appearance of long-term epigenetic-based phenotypes. Later in development, gonadal formation generates hormonal differences between the sexes, and male and female placentae exhibit different responses to environmental stressors. The maternal environment, including hormones and environmental insults during pregnancy, contributes to sex-specific placental development that controls genetic and epigenetic programming during foetal development, regulating sex-specific differences, including sex-specific epigenetic responses to environmental hazards, leading to long-term effects. This review summarizes several human and animal studies examining sex-specific responses to environmental stressors during both the periconception period (caused by differences in sex chromosome dosage) and placental development (caused by both sex chromosomes and hormones). The identification of relevant sex-dependent trajectories caused by sex chromosomes and/or sex hormones is essential to define diagnostic markers and prevention/intervention protocols.
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Affiliation(s)
| | | | | | - Pat Lonergan
- School of Agriculture and Food ScienceUniversity College Dublin, Dublin, Ireland
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59
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Zhang Y, Wang Q, Wang H, Duan E. Uterine Fluid in Pregnancy: A Biological and Clinical Outlook. Trends Mol Med 2017. [DOI: 10.1016/j.molmed.2017.05.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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60
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Paternal low protein diet programs preimplantation embryo gene expression, fetal growth and skeletal development in mice. Biochim Biophys Acta Mol Basis Dis 2017; 1863:1371-1381. [DOI: 10.1016/j.bbadis.2017.02.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/06/2017] [Accepted: 02/08/2017] [Indexed: 12/25/2022]
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61
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Zheng J, Xiao X, Zhang Q, Wang T, Yu M, Xu J. Maternal Low-Protein Diet Modulates Glucose Metabolism and Hepatic MicroRNAs Expression in the Early Life of Offspring †. Nutrients 2017; 9:nu9030205. [PMID: 28264458 PMCID: PMC5372868 DOI: 10.3390/nu9030205] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 02/22/2017] [Accepted: 02/23/2017] [Indexed: 12/21/2022] Open
Abstract
Emerging studies revealed that maternal protein restriction was associated with increased risk of type 2 diabetes mellitus in adulthood. However, the mechanisms of its effects on offspring, especially during early life of offspring, are poorly understood. Here, it is hypothesized that impaired metabolic health in offspring from maternal low-protein diet (LPD) is associated with perturbed miRNAs expression in offspring as early as the weaning age. We examined the metabolic effects on the C57BL/6J mice male offspring at weaning from dams fed with LPD or normal chow diet (NCD) throughout pregnancy and lactation. Maternal LPD feeding impaired metabolic health in offspring. Microarray profiling indicated that mmu-miR-615, mmu-miR-124, mmu-miR-376b, and mmu-let-7e were significantly downregulated, while, mmu-miR-708 and mmu-miR-879 were upregulated in LPD offspring. Bioinformatic analysis showed target genes were mapped to inflammatory-related pathways. Serum tumor necrosis factor-α (TNF-α) levels were higher and interleukin 6 (IL-6) had a tendency to be elevated in the LPD group. Finally, both mRNA and protein levels of IL-6 and TNF-α were significantly increased in the LPD group. Our findings provide novel evidence that maternal LPD can regulate miRNAs expression, which may be associated with chronic inflammation status and metabolic health in offspring as early as the weaning age.
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Affiliation(s)
- Jia Zheng
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
| | - Xinhua Xiao
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
| | - Qian Zhang
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
| | - Tong Wang
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
| | - Miao Yu
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
| | - Jianping Xu
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
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Chavatte-Palmer P, Tarrade A, Kiefer H, Duranthon V, Jammes H. Breeding animals for quality products: not only genetics. Reprod Fertil Dev 2017; 28:94-111. [PMID: 27062878 DOI: 10.1071/rd15353] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The effect of the Developmental Origins of Health and Disease on the spread of non-communicable diseases is recognised by world agencies such as the United Nations and the World Health Organization. Early environmental effects on offspring phenotype also apply to domestic animals and their production traits. Herein, we show that maternal nutrition not only throughout pregnancy, but also in the periconception period can affect offspring phenotype through modifications of gametes, embryos and placental function. Because epigenetic mechanisms are key processes in mediating these effects, we propose that the study of epigenetic marks in gametes may provide additional information for domestic animal selection.
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Affiliation(s)
| | - Anne Tarrade
- INRA, UMR 1198 Biologie du Développement et Reproduction, 78350 Jouy en Josas, France
| | - Hélène Kiefer
- INRA, UMR 1198 Biologie du Développement et Reproduction, 78350 Jouy en Josas, France
| | - Véronique Duranthon
- INRA, UMR 1198 Biologie du Développement et Reproduction, 78350 Jouy en Josas, France
| | - Hélène Jammes
- INRA, UMR 1198 Biologie du Développement et Reproduction, 78350 Jouy en Josas, France
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63
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Lucas ES, Watkins AJ. The Long-Term Effects of the Periconceptional Period on Embryo Epigenetic Profile and Phenotype; The Paternal Role and His Contribution, and How Males Can Affect Offspring's Phenotype/Epigenetic Profile. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1014:137-154. [PMID: 28864989 DOI: 10.1007/978-3-319-62414-3_8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The number of adults afflicted with heart disease, obesity and diabetes, central components of metabolic disorder, has grown rapidly in recent decades, affecting up to one quarter of the world's population. Typically, these diseases are attributed to lifestyle factors such as poor diet, lack of exercise and smoking. However, studies have now identified strong associations between patterns of growth during foetal and neonatal life and an increase predisposition towards developing heart disease, obesity and diabetes in adult life. While the connection between a mother's diet and the long-term health of her offspring has been studied in great detail, our understanding of whether offspring health might be affected by a father's diet remains limited. Greater insight into the impact that paternal nutrition has on sperm quality, epigenetic status and potential offspring programming mechanisms is needed to redress this parental-programming knowledge imbalance. Disturbances in paternal reproductive epigenetic status represents one key mechanism linking paternal diet with the programing of offspring development and adult health, as many enzymatic processes involved in epigenetic regulation use metabolic intermediates to modify DNA and histones. Here, poor paternal nutrition could result in perturbed sperm and testicular epigenetic status, impacting on post-fertilisation gene transcriptional regulation and protein expression in offspring tissues, resulting in increased incidences of metabolic disorder in adult life.
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Affiliation(s)
- Emma S Lucas
- Division of Reproductive Health, Clinical Science Research Laboratories, Warwick Medical School, University of Warwick, Coventry, CV2 2DX, UK
| | - Adam J Watkins
- Aston Research Centre for Healthy Ageing, School of Life and Health Sciences, Aston University, Birmingham, B4 7ET, UK.
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The Long-Term Effect of the Periconception Period on the Embryo’s Epigenetic Profile and Phenotype: The Role of Maternal Disease Such as Diabetes and How the Effect Is Mediated (Example from a Rabbit Model). PERICONCEPTION IN PHYSIOLOGY AND MEDICINE 2017; 1014:107-115. [DOI: 10.1007/978-3-319-62414-3_6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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The Role of Maternal Nutrition During the Periconceptional Period and Its Effect on Offspring Phenotype. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1014:87-105. [DOI: 10.1007/978-3-319-62414-3_5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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66
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Inter-generational effects of the in vitro maturation technique on pregnancy outcomes, early development, and cognition of offspring in mouse model. Clin Chim Acta 2016; 473:218-227. [PMID: 27871845 DOI: 10.1016/j.cca.2016.11.025] [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: 07/25/2016] [Revised: 11/16/2016] [Accepted: 11/16/2016] [Indexed: 11/20/2022]
Abstract
In vitro maturation (IVM) of oocytes has been a highly successful method for avoiding the occurrence of severe ovarian hyperstimulation syndrome in some patients during in vitro fertilization. However, the safety of the protocol, especially the long-term effects, is still an issue of debate. The current study is to investigate the long-term effects of IVM on mice through two generations and reveal its inter-generational effects as well. The data indicate that the rates of embryo resorption and fetal death in the F1 generation were significantly increased while the newborn survival rate in the F1 and F2 generations were significantly decreased in the IVM group. Increased body weights in the F1 generation and mouse number per litter in the F2 generation were observed in both the IVM and VVM groups; however, no insulin resistance was detected. No significant differences were detected in birth defects, organ weights, testis histology and sperm motility, estrous cycle, and cognition among the IVM, VVM and N mice in either the F1 or F2 generations. Our results suggest that mouse IVM can affect pregnancy outcomes throughout two generations. IVM does not appear to influence the development and cognition of the offspring throughout two generations.
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Li Y, Seah MKY, O'Neill C. Mapping global changes in nuclear cytosine base modifications in the early mouse embryo. Reproduction 2016; 151:83-95. [PMID: 26660107 PMCID: PMC4676261 DOI: 10.1530/rep-15-0207] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Reprogramming epigenetic modifications to cytosine is required for normal embryo development. We used improved immunolocalization techniques to simultaneously map global changes in the levels of 5'-methylcytosine (5meC) and 5'-hydroxymethylcytosine (5hmC) in each cell of the embryo from fertilization through the first rounds of cellular differentiation. The male and female pronuclei of the zygote showed similar staining levels, and these remained elevated over the next three cell cycles. The inner cells of the morula showed a progressive reduction in global levels of both 5meC and 5hmC and further losses occurred in the pluripotent inner cell mass (ICM) of the blastocyst. This was accompanied by undetectable levels of DNA methyltransferase of each class in the nuclei of the ICM, while DNA methyltransferase 3B was elevated in the hypermethylated nuclei of the trophectoderm (TE). Segregation of the ICM into hypoblast and epiblast was accompanied by increased levels in the hypoblast compared with the epiblast. Blastocyst outgrowth in vitro is a model for implantation and showed that a demethylated state persisted in the epiblast while the hypoblast had higher levels of both 5meC and 5hmC staining. The high levels of 5meC and 5hmC evident in the TE persisted in trophoblast and trophoblast giant cells after attachment of the blastocyst to the substratum in vitro. This study shows that global cytosine hypomethylation and hypohydroxymethylation accompanied the formation of the pluripotent ICM and this persisted into the epiblast after blastocyst outgrowth, and each differentiated lineage formed in the early embryo showed higher global levels of 5meC and 5hmC.
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Affiliation(s)
- Y Li
- Centre for Developmental and Regenerative MedicineKolling Institute for Medical Research, Sydney Medical School, University of Sydney, Sydney, New South Wales 2065, Australia
| | - Michelle K Y Seah
- Centre for Developmental and Regenerative MedicineKolling Institute for Medical Research, Sydney Medical School, University of Sydney, Sydney, New South Wales 2065, Australia
| | - C O'Neill
- Centre for Developmental and Regenerative MedicineKolling Institute for Medical Research, Sydney Medical School, University of Sydney, Sydney, New South Wales 2065, Australia
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Salvaing J, Peynot N, Bedhane MN, Veniel S, Pellier E, Boulesteix C, Beaujean N, Daniel N, Duranthon V. Assessment of 'one-step' versus 'sequential' embryo culture conditions through embryonic genome methylation and hydroxymethylation changes. Hum Reprod 2016; 31:2471-2483. [PMID: 27664206 PMCID: PMC5088634 DOI: 10.1093/humrep/dew214] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 07/26/2016] [Accepted: 08/04/2016] [Indexed: 12/13/2022] Open
Abstract
STUDY QUESTION In comparison to in vivo development, how do different conditions of in vitro culture (‘one step’ versus ‘sequential medium’) impact DNA methylation and hydroxymethylation in preimplantation embryos? SUMMARY ANSWER Using rabbit as a model, we show that DNA methylation and hydroxymethylation are both affected by in vitro culture of preimplantation embryos and the effect observed depends on the culture medium used. WHAT IS KNOWN ALREADY Correct regulation of DNA methylation is essential for embryonic development and DNA hydroxymethylation appears more and more to be a key player. Modifications of the environment of early embryos are known to have long term effects on adult phenotypes and health; these probably rely on epigenetic alterations. STUDY DESIGN SIZE, DURATION The study design we used is both cross sectional (control versus treatment) and longitudinal (time-course). Each individual in vivo experiment used embryos flushed from the donor at the 2-, 4-, 8-, 16- or morula stage. Each stage was analyzed in at least two independent experiments. Each individual in vitro experiment used embryos flushed from donors at the 1-cell stage (19 h post-coïtum) which were then cultured in parallel in the two tested media until the 2-, 4-, 8- 16-cell or morula stages. Each stage was analyzed in at least three independent experiments. In both the in vivo and in vitro experiments, 4-cell stage embryos were always included as an internal reference. PARTICIPANTS/MATERIALS, SETTING, METHODS Immunofluorescence with antibodies specific for 5-methylcytosine (5meC) and 5-hydroxymethylcytosine (5hmeC) was used to quantify DNA methylation and hydroxymethylation levels in preimplantation embryos. We assessed the expression of DNA methyltransferases (DNMT), of ten eleven translocation (TET) dioxigenases and of two endogenous retroviral sequences (ERV) using RT-qPCR, since the expression of endogenous retroviral sequences is known to be regulated by DNA methylation. Three repeats were first done for all stages; then three additional repetitions were performed for those stages showing differences or tendencies toward differences between the different conditions in the first round of quantification. MAIN RESULTS AND THE ROLE OF CHANCE The kinetics of DNA methylation and hydroxymethylation were modified in in vitro cultured embryos, and the observed differences depended on the type of medium used. These differences were statistically significant. In addition, the expression of TET1 and TET2 was significantly reduced in post-embryonic genome activation (EGA) embryos after in vitro culture in both tested conditions. Finally, the expression of two retroviral sequences was analyzed and found to be significantly affected by in vitro culture. LIMITATIONS REASONS FOR CAUTION Our study remains mostly descriptive as no direct link can be established between the epigenetic changes observed and the expression changes in both effectors and targets of the studied epigenetic modifications. The results we obtained suggest that gene expression could be affected on a large scale, but this remains to be confirmed. WIDER IMPLICATIONS OF THE FINDINGS Our results are in agreement with the literature, showing that DNA methylation is sensitive to in vitro culture. As we observed an effect of both tested culture conditions on the tested epigenetic marks and on gene expression, we cannot conclude which medium is potentially closest to in vivo conditions. However, as the observed effects are different, additional studies may provide more information and potential recommendations for the use of culture media in assisted reproductive technology. STUDY FUNDING/COMPETING INTEREST(S) This work was supported by an ‘AMP diagnostic prénatal et diagnostic génétique’ 2012 grant from the French Agence de la Biomédecine. This study was performed within the framework of ANR LABEX ‘REVIVE’ (ANR-10-LABX-73). Authors are members of RGB-Net (TD 1101) and Epiconcept (FA 1201) COST actions. The authors declare that there is no competing interest.
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Affiliation(s)
- J Salvaing
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France .,UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - N Peynot
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - M N Bedhane
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France.,Present address: Jigjiga University, Ethiopia
| | - S Veniel
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - E Pellier
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France.,Present address: Faculté de Médecine, 27 Bd Jean Moulin, 13385 Marseille Cedex C5, France
| | - C Boulesteix
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - N Beaujean
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France.,Present address: INSERM U1208, INRA USC1361 Stem Cell and Brain Research Institute Department of Pluripotent Stem Cells in Mammals, 18 avenue Doyen Lépine, 69675 Bron, France
| | - N Daniel
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
| | - V Duranthon
- UMR BDR, INRA, ENVA, Université Paris Saclay, 78350 Jouy en Josas, France
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Siqueira LGB, Hansen PJ. Sex differences in response of the bovine embryo to colony-stimulating factor 2. Reproduction 2016; 152:645-654. [PMID: 27601717 PMCID: PMC5097130 DOI: 10.1530/rep-16-0336] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 09/05/2016] [Indexed: 01/09/2023]
Abstract
We tested whether gene expression of the bovine morula is modified by CSF2 in a sex-dependent manner and if sex determines the effect of CSF2 on competence of embryos to become blastocysts. Embryos were produced in vitro using X- or Y-sorted semen and treated at Day 5 of culture with 10 ng/mL bovine CSF2 or control. In experiment 1, morulae were collected at Day 6 and biological replicates (n = 8) were evaluated for transcript abundance of 90 genes by RT-qPCR using the Fluidigm Delta Gene assay. Expression of more than one-third (33 of 90) of genes examined was affected by sex. The effect of CSF2 on gene expression was modified by sex (P < 0.05) for five genes (DDX3Y/DDX3X-like, NANOG, MYF6, POU5F1 and RIPK3) and tended (P < 0.10) to be modified by sex for five other genes (DAPK1, HOXA5, PPP2R3A, PTEN and TNFSF8). In experiment 2, embryos were treated at Day 5 with control or CSF2 and blastocysts were collected at Day 7 for immunolabeling to determine the number of inner cell mass (ICM) and trophectoderm (TE) cells. CSF2 increased the percent of putative zygotes that became blastocysts for females, but did not affect the development of males. There was no effect of CSF2 or interaction of CSF2 with sex on the total number of blastomeres in blastocysts or in the number of inner cell mass or trophectoderm cells. In conclusion, CSF2 exerted divergent responses on gene expression and development of female and male embryos. These results are evidence of sexually dimorphic responses of the preimplantation embryo to this embryokine.
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Affiliation(s)
- Luiz G B Siqueira
- Department of Animal SciencesD.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, Florida, USA.,Embrapa Gado de LeiteJuiz de Fora, MG, Brazil
| | - Peter J Hansen
- Department of Animal SciencesD.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, Florida, USA
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Kleijkers SHM, Mantikou E, Slappendel E, Consten D, van Echten-Arends J, Wetzels AM, van Wely M, Smits LJM, van Montfoort APA, Repping S, Dumoulin JCM, Mastenbroek S. Influence of embryo culture medium (G5 and HTF) on pregnancy and perinatal outcome after IVF: a multicenter RCT. Hum Reprod 2016; 31:2219-30. [PMID: 27554441 DOI: 10.1093/humrep/dew156] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 05/19/2016] [Indexed: 12/20/2022] Open
Abstract
STUDY QUESTION Does embryo culture medium influence pregnancy and perinatal outcome in IVF? SUMMARY ANSWER Embryo culture media used in IVF affect treatment efficacy and the birthweight of newborns. WHAT IS KNOWN ALREADY A wide variety of culture media for human preimplantation embryos in IVF/ICSI treatments currently exists. It is unknown which medium is best in terms of clinical outcomes. Furthermore, it has been suggested that the culture medium used for the in vitro culture of embryos affects birthweight, but this has never been demonstrated by large randomized trials. STUDY DESIGN, SIZE, DURATION We conducted a multicenter, double-blind RCT comparing the use of HTF and G5 embryo culture media in IVF. Between July 2010 and May 2012, 836 couples (419 in the HTF group and 417 in the G5 group) were included. The allocated medium (1:1 allocation) was used in all treatment cycles a couple received within 1 year after randomization, including possible transfers with frozen-thawed embryos. The primary outcome was live birth rate. PARTICIPANTS/MATERIALS, SETTING, METHODS Couples that were scheduled for an IVF or an ICSI treatment at one of the six participating centers in the Netherlands or their affiliated clinics. MAIN RESULTS AND THE ROLE OF CHANCE The live birth rate was higher, albeit nonsignificantly, in couples assigned to G5 than in couples assigned to HTF (44.1% (184/417) versus 37.9% (159/419); RR: 1.2; 95% confidence interval (CI): 0.99-1.37; P = 0.08). Number of utilizable embryos per cycle (2.8 ± 2.3 versus 2.3 ± 1.8; P < 0.001), implantation rate after fresh embryo transfer (20.2 versus 15.3%; P < 0.001) and clinical pregnancy rate (47.7 versus 40.1%; RR: 1.2; 95% CI: 1.02-1.39; P = 0.03) were significantly higher for couples assigned to G5 compared with those assigned to HTF. Of the 383 live born children in this trial, birthweight data from 380 children (300 singletons (G5: 163, HTF: 137) and 80 twin children (G5: 38, HTF: 42)) were retrieved. Birthweight was significantly lower in the G5 group compared with the HTF group, with a mean difference of 158 g (95% CI: 42-275 g; P = 0.008). More singletons were born preterm in the G5 group (8.6% (14/163) versus 2.2% (3/137), but singleton birthweight adjusted for gestational age and gender (z-score) was also lower in the G5 than in the HTF group (-0.13 ± 0.08 versus 0.17 ± 0.08; P = 0.008). LIMITATIONS, REASONS FOR CAUTION This study was powered to detect a 10% difference in live births while a smaller difference could still be clinically relevant. The effect of other culture media on perinatal outcome remains to be determined. WIDER IMPLICATIONS OF THE FINDINGS Embryo culture media used in IVF affect not only treatment efficacy but also perinatal outcome. This suggests that the millions of human embryos that are cultured in vitro each year are sensitive to their environment. These findings should lead to increased awareness, mechanistic studies and legislative adaptations to protect IVF offspring during the first few days of their existence. STUDY FUNDING/COMPETING INTERESTS This project was partly funded by The NutsOhra foundation (Grant 1203-061) and March of Dimes (Grant 6-FY13-153). The authors declare no conflict of interest. TRIAL REGISTRATION NUMBER NTR1979 (Netherlands Trial Registry). TRIAL REGISTRATION DATE 1 September 2009. DATE OF FIRST PATIENT'S ENROLMENT 18 July 2010.
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Affiliation(s)
- Sander H M Kleijkers
- Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Eleni Mantikou
- Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Els Slappendel
- IVF Department, Catharina Hospital, Eindhoven, The Netherlands
| | - Dimitri Consten
- Center for Reproductive Medicine, St. Elisabeth Hospital, Tilburg, The Netherlands
| | - Jannie van Echten-Arends
- Section of Reproductive Medicine, Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Alex M Wetzels
- Department of Obstetrics and Gynaecology, Radboud university medical center, Nijmegen, The Netherlands
| | - Madelon van Wely
- Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Luc J M Smits
- Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Aafke P A van Montfoort
- Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Sjoerd Repping
- Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - John C M Dumoulin
- Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Sebastiaan Mastenbroek
- Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Vinter CA, Geirsson RT. Why it is critical to address the challenge of maternal obesity. Acta Obstet Gynecol Scand 2016; 95:965-7. [PMID: 27528565 DOI: 10.1111/aogs.12911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christina A Vinter
- Department of Obstetrics and Gynecology, Odense University Hospital/University of Southern Denmark, Odense, Denmark
| | - Reynir T Geirsson
- University Department of Obstetrics and Gynecology, Landspitali University Hospital/University of Iceland, Reykjavik, Iceland
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Velazquez MA, Smith CGC, Smyth NR, Osmond C, Fleming TP. Advanced maternal age causes adverse programming of mouse blastocysts leading to altered growth and impaired cardiometabolic health in post-natal life. Hum Reprod 2016; 31:1970-80. [PMID: 27402911 PMCID: PMC4991661 DOI: 10.1093/humrep/dew177] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 06/17/2016] [Indexed: 12/27/2022] Open
Abstract
STUDY QUESTION Does advanced maternal age (AMA) in mice affect cardiometabolic health during post-natal life in offspring derived from an assisted reproduction technology (ART) procedure? SUMMARY ANSWER Offspring derived from blastocysts collected from aged female mice displayed impaired body weight gain, blood pressure, glucose metabolism and organ allometry during post-natal life compared with offspring derived from blastocysts from young females; since all blastocysts were transferred to normalized young mothers, this effect is independent of maternal pregnancy conditions. WHAT IS KNOWN ALREADY Although studies in mice have shown that AMA can affect body weight and behaviour of offspring derived from natural reproduction, data on the effects of AMA on offspring cardiometabolic health during post-natal development are not available. Given the increasing use of ART to alleviate infertility in women of AMA, it is pivotal to develop ART-AMA models addressing the effects of maternal aging on offspring health. STUDY DESIGN, SIZE, DURATION Blastocysts from old (34-39 weeks) or young (8-9 weeks) C57BL/6 females mated with young CBA males (13-15 weeks) were either subjected to differential cell staining (inner cell mass and trophectoderm) or underwent embryo transfer (ET) into young MF1 surrogates (8-9 weeks) to produce young (Young-ET, 9 litters) and old (Old-ET, 10 litters) embryo-derived offspring. Offspring health monitoring was carried out for 30 weeks. PARTICIPANTS/MATERIALS, SETTING, METHODS All animals were fed with standard chow. Blood pressure was measured at post-natal Weeks 9, 15 and 21, and at post-natal Week 30 a glucose tolerance test (GTT) was performed. Two days after the GTT mice were killed for organ allometry. Blastocyst cell allocation variables were evaluated by T-test and developmental data were analysed with a multilevel random effects regression model. MAIN RESULTS AND THE ROLE OF CHANCE The total number of cells in blastocysts from aged mice was decreased (P < 0.05) relative to young mice due to a lower number of cells in the trophectoderm (mean ± SEM: 34.5 ± 2.1 versus 29.6 ± 1.0). Weekly body weight did not differ in male offspring, but an increase in body weight from Week 13 onwards was observed in Old-ET females (final body weight at post-natal Week 30: 38.5 ± 0.8 versus 33.4 ± 0.8 g, P < 0.05). Blood pressure was increased in Old-ET offspring at Weeks 9-15 in males (Week 9: 108.5 ± 3.13 versus 100.8 ± 1.5 mmHg, Week 15: 112.9 ± 3.2 versus 103.4 ± 2.1 mmHg) and Week 15 in females (115.9 ± 3.7 versus 102.8 ± 0.7 mmHg; all P < 0.05 versus Young-ET). The GTT results and organ allometry were not affected in male offspring. In contrast, Old-ET females displayed a greater (P < 0.05) peak glucose concentration at 30 min during the GTT (21.1 ± 0.4 versus 17.8 ± 1.16 mmol/l) and their spleen weight (88.2 ± 2.6 ± 105.1 ± 4.6 mg) and several organ:body weight ratios (g/g × 10(3)) were decreased (P < 0.05 versus Young-ET), including the heart (3.7 ± 0.06 versus 4.4 ± 0.08), lungs (4.4 ± 0.1 versus 5.0 ± 0.1), spleen (2.4 ± 0.06 versus 3.2 ± 0.1) and liver (36.4 ± 0.6 versus 39.1 ± 0.9). LIMITATIONS, REASONS FOR CAUTION Results from experimental animal models cannot be extrapolated to humans. Nevertheless, they are valuable to develop conceptual models that can produce hypotheses for eventual testing in the target species (i.e. humans). WIDER IMPLICATIONS OF THE FINDINGS Our data show that offspring from mouse embryos from aged mothers can develop altered phenotypes during post-natal development compared with embryos from young mothers. Because all embryos were transferred into young mothers for the duration of pregnancy to normalize the maternal in vivo environment, our findings indicate that adverse programming via AMA is already established at the blastocyst stage. Whilst human embryos display increased aneuploidy compared with mouse, we believe our data have implications for women of AMA undergoing assisted reproduction, including surrogacy programmes. STUDY FUNDING/COMPETING INTERESTS This work was supported through the European Union FP7-CP-FP Epihealth programme (278418) to T.P.F. and the BBSRC (BB/F007450/1) to T.P.F. The authors have no conflicts of interest to declare.
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Affiliation(s)
- M A Velazquez
- Centre for Biological Sciences, University of Southampton, Southampton SO16 6YD, UK School of Agriculture, Food & Rural Development, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
| | - C G C Smith
- Centre for Biological Sciences, University of Southampton, Southampton SO16 6YD, UK
| | - N R Smyth
- Centre for Biological Sciences, University of Southampton, Southampton SO16 6YD, UK
| | - C Osmond
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton SO16 6YD, UK
| | - T P Fleming
- Centre for Biological Sciences, University of Southampton, Southampton SO16 6YD, UK
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The 'Developmental Origins' Hypothesis: relevance to the obstetrician and gynecologist. J Dev Orig Health Dis 2016; 6:415-24. [PMID: 26347389 DOI: 10.1017/s2040174415001324] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The recognition of 'fetal origins of adult disease' has placed new responsibilities on the obstetrician, as antenatal care is no longer simply about ensuring good perinatal outcomes, but also needs to plan for optimal long-term health for mother and baby. Recently, it has become clear that the intrauterine environment has a broad and long-lasting impact, influencing fetal and childhood growth and development as well as future cardiovascular health, non-communicable disease risk and fertility. This article looks specifically at the importance of the developmental origins of ovarian reserve and ageing, the role of the placenta and maternal nutrition before and during pregnancy. It also reviews recent insights in developmental medicine of relevance to the obstetrician, and outlines emerging evidence supporting a proactive clinical approach to optimizing periconceptional as well as antenatal care aimed to protect newborns against long-term disease susceptibility.
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Sandra O. Hormonal control of implantation. ANNALES D'ENDOCRINOLOGIE 2016; 77:63-6. [DOI: 10.1016/j.ando.2016.04.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 04/11/2016] [Indexed: 12/17/2022]
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Denisenko O, Lucas ES, Sun C, Watkins AJ, Mar D, Bomsztyk K, Fleming TP. Regulation of ribosomal RNA expression across the lifespan is fine-tuned by maternal diet before implantation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:906-13. [PMID: 27060415 PMCID: PMC4914606 DOI: 10.1016/j.bbagrm.2016.04.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 03/18/2016] [Accepted: 04/04/2016] [Indexed: 01/17/2023]
Abstract
Cells and organisms respond to nutrient deprivation by decreasing global rates of transcription, translation and DNA replication. To what extent such changes can be reversed is largely unknown. We examined the effect of maternal dietary restriction on RNA synthesis in the offspring. Low protein diet fed either throughout gestation or for the preimplantation period alone reduced cellular RNA content across fetal somatic tissues during challenge and increased it beyond controls in fetal and adult tissues after challenge release. Changes in transcription of ribosomal RNA, the major component of cellular RNA, were responsible for this phenotype as evidenced by matching alterations in RNA polymerase I density and DNA methylation at ribosomal DNA loci. Cellular levels of the ribosomal transcription factor Rrn3 mirrored the rRNA expression pattern. In cell culture experiments, Rrn3 overexpression reduced rDNA methylation and increased rRNA expression; the converse occurred after inhibition of Rrn3 activity. These observations define novel mechanism where poor nutrition before implantation irreversibly alters basal rates of rRNA transcription thereafter in a process mediated by rDNA methylation and Rrn3 factor. Maternal malnutrition downregulates rDNA transcription in fetal tissues. Switch to normal diet permanently upregulates rDNA transcription compared to controls. These changes are mediated by DNA methylation and Pol I transcription factor Rrn3. This mechanism is activated before implantation.
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Affiliation(s)
- Oleg Denisenko
- Department of Medicine, University of Washington, 850 Republican St., Rm 242, Seattle, WA 98109, USA.
| | - Emma S Lucas
- Centre for Biological Sciences, University of Southampton, Mailpoint 840, Level D Lab & Path Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - Congshan Sun
- Centre for Biological Sciences, University of Southampton, Mailpoint 840, Level D Lab & Path Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - Adam J Watkins
- Centre for Biological Sciences, University of Southampton, Mailpoint 840, Level D Lab & Path Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
| | - Daniel Mar
- Department of Medicine, University of Washington, 850 Republican St., Rm 242, Seattle, WA 98109, USA
| | - Karol Bomsztyk
- Department of Medicine, University of Washington, 850 Republican St., Rm 242, Seattle, WA 98109, USA
| | - Tom P Fleming
- Centre for Biological Sciences, University of Southampton, Mailpoint 840, Level D Lab & Path Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK
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Sferruzzi-Perri AN, Camm EJ. The Programming Power of the Placenta. Front Physiol 2016; 7:33. [PMID: 27014074 PMCID: PMC4789467 DOI: 10.3389/fphys.2016.00033] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 01/25/2016] [Indexed: 12/23/2022] Open
Abstract
Size at birth is a critical determinant of life expectancy, and is dependent primarily on the placental supply of nutrients. However, the placenta is not just a passive organ for the materno-fetal transfer of nutrients and oxygen. Studies show that the placenta can adapt morphologically and functionally to optimize substrate supply, and thus fetal growth, under adverse intrauterine conditions. These adaptations help meet the fetal drive for growth, and their effectiveness will determine the amount and relative proportions of specific metabolic substrates supplied to the fetus at different stages of development. This flow of nutrients will ultimately program physiological systems at the gene, cell, tissue, organ, and system levels, and inadequacies can cause permanent structural and functional changes that lead to overt disease, particularly with increasing age. This review examines the environmental regulation of the placental phenotype with particular emphasis on the impact of maternal nutritional challenges and oxygen scarcity in mice, rats and guinea pigs. It also focuses on the effects of such conditions on fetal growth and the developmental programming of disease postnatally. A challenge for future research is to link placental structure and function with clinical phenotypes in the offspring.
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Affiliation(s)
| | - Emily J Camm
- Department of Physiology, Development and Neuroscience, University of Cambridge Cambridge, UK
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77
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Hansen PJ, Dobbs KB, Denicol AC, Siqueira LGB. Sex and the preimplantation embryo: implications of sexual dimorphism in the preimplantation period for maternal programming of embryonic development. Cell Tissue Res 2016; 363:237-247. [PMID: 26391275 PMCID: PMC4703572 DOI: 10.1007/s00441-015-2287-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 08/18/2015] [Indexed: 12/29/2022]
Abstract
The developmental program of the embryo displays a plasticity that can result in long-acting effects that extend into postnatal life. In mammals, adult phenotype can be altered by changes in the maternal environment during the preimplantation period. One characteristic of developmental programming during this time is that the change in adult phenotype is often different for female offspring than for male offspring. In this paper, we propose the hypothesis that sexual dimorphism in preimplantation programming is mediated, at least in part, by sex-specific responses of embryos to maternal regulatory molecules whose secretion is dependent on the maternal environment. The strongest evidence for this idea comes from the study of colony-stimulating factor 2 (CSF2). Expression of CSF2 from the oviduct and endometrium is modified by environmental factors of the mother, in particular seminal plasma and obesity. Additionally, CSF2 alters several properties of the preimplantation embryo and has been shown to alleviate negative consequences of culture of mouse embryos on postnatal phenotype in a sex-dependent manner. In cattle, exposure of preimplantation bovine embryos to CSF2 causes sex-specific changes in gene expression, interferon-τ secretion and DNA methylation later in pregnancy (day 15 of gestation). It is likely that several embryokines can alter postnatal phenotype through actions directed towards the preimplantation embryo. Identification of these molecules and elucidation of the mechanisms by which sexually-disparate programming is established will lead to new insights into the control and manipulation of embryonic development.
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Affiliation(s)
- Peter J Hansen
- Department of Animal Sciences, University of Florida, PO Box 110910, Gainesville, FL, 32611-0910, USA.
| | - Kyle B Dobbs
- Department of Biology, Mugar 212-213, Northeastern University, 360 Huntington Avenue, Boston, MA, 02115, USA
| | - Anna C Denicol
- Department of Biology, Mugar 212-213, Northeastern University, 360 Huntington Avenue, Boston, MA, 02115, USA
| | - Luiz G B Siqueira
- Department of Animal Sciences, University of Florida, PO Box 110910, Gainesville, FL, 32611-0910, USA
- Embrapa Gado de Leite, Rua Eugenio do Nascimento, 610, Juiz de Fora, MG 36038-330, Brazil
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78
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Demura M, Saijoh K. The Role of DNA Methylation in Hypertension. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 956:583-598. [PMID: 27888489 DOI: 10.1007/5584_2016_80] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
DNA methylation is the covalent modification of DNA that affects its function, without altering DNA sequences. Three important roles of DNA methylation include intrauterine programming, acquired predisposition, and transgenerational inheritance. A wide variety of factors can affect DNA methylation. Intrauterine programming involves drastic changes in DNA methylation patterns during cellular development and differentiation, which have a long-lasting effect on the predisposition of offspring. Influences from the mother, including maternal nutritional status, modify intrauterine epigenetic programming. In contrast to the rapid and drastic changes in utero, postnatal factors in daily life can also continue to slowly and dynamically change DNA methylation patterns in both somatic and germ cells. Epigenetic changes occurring in germ cell DNA exert a transgenerational impact on the phenotype of future generations, thus providing a means for ancestral transmission of environmental experiences. Despite adaptive ability, mismatch effect of transgenerational inheritance could be potentially harmful to health if environment has changed, and the acquired acclimatization is no longer beneficial. Increasing evidence from both human and animal studies indicates that DNA methylation exerts a causal impact on the development of hypertension. Therefore, an adverse outcome of maternal malnutrition could be the development of hypertension in offspring, whereby nutritional factors or disease conditions could induce phenotypes susceptible to hypertension through alteration of DNA methylation patterns. These factors are likely to alter DNA methylation patterns in all tissues including germ cells, and despite no direct evidence of an association between transgenerational epigenetic inheritance and hypertension, it is likely to play a role.
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Affiliation(s)
- Masashi Demura
- Department of Hygiene, Graduate School of Medical Science, Kanazawa University, Kanazawa, 920-8640, Japan.
| | - Kiyofumi Saijoh
- Department of Hygiene, Graduate School of Medical Science, Kanazawa University, Kanazawa, 920-8640, Japan
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79
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Naturil-Alfonso C, Lavara R, Vicente JS, Marco-Jiménez F. Effects of Female Dietary Restriction in a Rabbit Growth Line During Rearing on Reproductive Performance and Embryo Quality. Reprod Domest Anim 2015; 51:114-22. [DOI: 10.1111/rda.12653] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 11/11/2015] [Indexed: 01/03/2023]
Affiliation(s)
- C Naturil-Alfonso
- Institute of Science and Animal Technology; Laboratorio de Biotecnología de la Reproducción; Universidad Politécnica de Valencia; Valencia Spain
| | - R Lavara
- Institute of Science and Animal Technology; Laboratorio de Biotecnología de la Reproducción; Universidad Politécnica de Valencia; Valencia Spain
- Department of Production and Animal Health; General Veterinary Health and the Science and Technology of Food Products; University CEU Cardenal Herrera; Valencia Spain
| | - JS Vicente
- Institute of Science and Animal Technology; Laboratorio de Biotecnología de la Reproducción; Universidad Politécnica de Valencia; Valencia Spain
| | - F Marco-Jiménez
- Institute of Science and Animal Technology; Laboratorio de Biotecnología de la Reproducción; Universidad Politécnica de Valencia; Valencia Spain
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80
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Eckert JJ, Velazquez MA, Fleming TP. Cell signalling during blastocyst morphogenesis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 843:1-21. [PMID: 25956293 DOI: 10.1007/978-1-4939-2480-6_1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Blastocyst morphogenesis is prepared for even before fertilisation. Information stored within parental gametes can influence both maternal and embryonic gene expression programmes after egg activation at fertilisation. A complex network of intrinsic, cell-cell mediated and extrinsic, embryo-environment signalling mechanisms operates throughout cleavage, compaction and cavitation. These signalling events not only ensure developmental progression, cell differentiation and lineage allocation to inner cell mass (embryo proper) and trophectoderm (future extraembryonic lineages) but also provide a degree of developmental plasticity ensuring survival in prevailing conditions by adaptive responses. Indeed, many cellular functions including differentiation, metabolism, gene expression and gene expression regulation are subject to plasticity with short- or long-term consequences even into adult life. The interplay between intrinsic and extrinsic signals impacting on blastocyst morphogenesis is becoming clearer. This has been best studied in the mouse which will be the focus of this chapter but translational significance to human and domestic animal embryology will be a focus in future years.
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Affiliation(s)
- Judith J Eckert
- Human Development and Health, Faculty of Medicine, University of Southampton, SO16 6YD, Southampton, UK
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81
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Kannampuzha‐Francis J, Denicol AC, Loureiro B, Kaniyamattam K, Ortega MS, Hansen PJ. Exposure to colony stimulating factor 2 during preimplantation development increases postnatal growth in cattle. Mol Reprod Dev 2015; 82:892-7. [DOI: 10.1002/mrd.22533] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 07/27/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Jasmine Kannampuzha‐Francis
- Department of Animal SciencesUniversity of Florida Gainesville Florida
- D. H. Barron Reproductive and Perinatal Biology Research ProgramUniversity of FloridaGainesvilleFlorida
| | - Anna C. Denicol
- Department of BiologyNortheastern UniversityBostonMassachusetts
| | - Barbara Loureiro
- School of Veterinary MedicineUniversidade Vila VelhaVila VelhaEspirito SantoBrazil
| | | | - M. Sofia Ortega
- Department of Animal SciencesUniversity of Florida Gainesville Florida
- D. H. Barron Reproductive and Perinatal Biology Research ProgramUniversity of FloridaGainesvilleFlorida
| | - Peter J. Hansen
- Department of Animal SciencesUniversity of Florida Gainesville Florida
- D. H. Barron Reproductive and Perinatal Biology Research ProgramUniversity of FloridaGainesvilleFlorida
- Genetics InstituteUniversity of FloridaGainesvilleFlorida
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82
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López-Cardona AP, Fernández-González R, Pérez-Crespo M, Alén F, de Fonseca FR, Orio L, Gutierrez-Adan A. Effects of synchronous and asynchronous embryo transfer on postnatal development, adult health, and behavior in mice. Biol Reprod 2015. [PMID: 26224009 DOI: 10.1095/biolreprod.115.130385] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Asynchronous embryo transfer (ET) is a common assisted reproduction technique used in several species, but its biological effects on postnatal and early development remain unknown. The aim of this study was to determine whether asynchronous ET produces long-term effects in mice. Postnatal development, animal weight, systolic blood pressure (SBP), relative organ weight (liver, spleen, kidneys, heart, lungs, brain, and testicles), and behavior (assessed in open-field and elevated plus maze tests) were assessed in CD1 mice produced by different ET procedures: 1) the transfer of Day 3.5 (D3.5) blastocysts to the uterus (BL-UT); 2) the transfer of D3.5 blastocysts to the oviduct (BL-OV); or 3) the transfer of D0.5 zygotes to the oviduct (Z-OV). In vivo conceived animals served as controls (CT). The transfer of blastocysts to the uterus or zygotes to the oviduct was defined as synchronous, and transfer of blastocysts to the oviduct was defined as asynchronous. Both synchronous and asynchronous ET resulted in increased weight at birth that normalized thereafter with the exception of asynchronous ET females. In this group, female BL-OV, a clear lower body weight was recorded along postnatal life when compared with controls (P < 0.05). No effects on animal weight were produced during postnatal development in the synchronous ET groups (BL-UT, Z-OV, and CT). Both synchronous and asynchronous ET had impacts on adult (Wk 30) organ weight. SBP was modified in animals derived from blastocyst but not zygote ET. Effects on behavior (anxiety in the plus maze) were only detected in the BL-UT group (P < 0.05). Our findings indicate that zygotes are less sensitive than blastocysts to ET and that both synchronous and asynchronous blastocyst ET may have long-term consequences on health, with possible impacts on weight, arterial pressure, relative organ weight, and behavior.
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Affiliation(s)
- Angela P López-Cardona
- Departamento Reproducción Animal, INIA, Madrid, Spain G.I. Biogénesis, Universidad de Antioquia, Medellín, Colombia
| | | | | | - Francisco Alén
- Departamento Psicobiología, Facultad de Psicología, UCM, Campus de Somosaguas, Madrid, Spain
| | - Fernando Rodriguez de Fonseca
- Departamento Psicobiología, Facultad de Psicología, UCM, Campus de Somosaguas, Madrid, Spain UGC Salud Mental, Instituto de Investigación Biomédica de Málaga (IBIMA), Universidad de Málaga-Hospital Universitario Regional de Málaga, Málaga, Spain
| | - Laura Orio
- Departamento Psicobiología, Facultad de Psicología, UCM, Campus de Somosaguas, Madrid, Spain
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83
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Denicol AC, Leão BCS, Dobbs KB, Mingoti GZ, Hansen PJ. Influence of Sex on Basal and Dickkopf-1 Regulated Gene Expression in the Bovine Morula. PLoS One 2015. [PMID: 26196299 PMCID: PMC4510475 DOI: 10.1371/journal.pone.0133587] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Sex affects function of the developing mammalian embryo as early as the preimplantation period. There were two goals of the current objective. The first was to determine the degree and nature of differences in gene expression between female and male embryos in the cow at the morula stage of development. The second objective was to determine whether DKK1, a molecule known to alter differentiation of the blastocyst, would affect gene expression differently for female and male morulae. In Experiment 1, female and male embryos were treated with DKK1 at Day 5 after insemination. Morulae were harvested 24 h after treatment, pooled in groups of 20 for microarray analysis and RNA subjected to analysis of gene expression by microarray hybridization. There were 662 differentially expressed genes between females and males and 128 of these genes had a fold change ≥ 1.5 between the two sexes. Of the genes upregulated in females, 49.5% were located in the X chromosome. Functional analysis predicted that cell survival was greater in female embryos. Experiment 2 involved a similar design except that transcripts for 12 genes previously reported to be affected by sex, DKK1 or the interaction were quantified by quantitative polymerase chain reaction. Expression of all genes tested that were affected by sex in experiment 1 was affected in a similar manner in Experiment 2. In contrast, effects of DKK1 on gene expression were largely not repeatable in Experiment 2. The exception was for the Hippo signaling gene AMOT, which was inhibited by DKK1. In Experiment 3, embryos produced by fertilization with unsorted sperm were treated with DKK1 at Day 5 and abundance of transcripts for CDX2, GATA6, and NANOG determined at Days 5, 6 and 7 after insemination. There was no effect of DKK1 on expression of any of the three genes. In conclusion, female and male bovine embryos have a different pattern of gene expression as early as the morula stage, and this is due to a large extent to expression of genes in the X chromosomes in females. Differential gene expression between female and male embryos is likely the basis for increased resistance to cell death signals in female embryos and disparity in responses of female and male embryos to changes in the maternal environment.
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Affiliation(s)
- Anna C Denicol
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, Florida, United States of America
| | - Beatriz C S Leão
- Laboratory of Physiology of Reproduction, School of Veterinary Medicine, Universidade Estadual Paulista-UNESP, Araçatuba, SP, Brazil
| | - Kyle B Dobbs
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, Florida, United States of America
| | - Gisele Z Mingoti
- Laboratory of Physiology of Reproduction, School of Veterinary Medicine, Universidade Estadual Paulista-UNESP, Araçatuba, SP, Brazil
| | - Peter J Hansen
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, Florida, United States of America
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84
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Besson AA, Lagisz M, Senior AM, Hector KL, Nakagawa S. Effect of maternal diet on offspring coping styles in rodents: a systematic review and meta-analysis. Biol Rev Camb Philos Soc 2015; 91:1065-1080. [DOI: 10.1111/brv.12210] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 06/07/2015] [Accepted: 06/18/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Anne A. Besson
- Department of Zoology; University of Otago; PO Box 56 Dunedin 9054 New Zealand
| | - Malgorzata Lagisz
- Department of Zoology; University of Otago; PO Box 56 Dunedin 9054 New Zealand
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, Biological Science Building; University of New South Wales; Sydney 2052 New South Wales Australia
| | - Alistair M. Senior
- Department of Zoology; University of Otago; PO Box 56 Dunedin 9054 New Zealand
- Charles Perkins Centre, The University of Sydney; Johns Hopkins Drive, Sydney 2009 New South Wales Australia
| | - Katie L. Hector
- Department of Zoology; University of Otago; PO Box 56 Dunedin 9054 New Zealand
| | - Shinichi Nakagawa
- Department of Zoology; University of Otago; PO Box 56 Dunedin 9054 New Zealand
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, Biological Science Building; University of New South Wales; Sydney 2052 New South Wales Australia
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85
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Burkuš J, Kačmarová M, Kubandová J, Kokošová N, Fabianová K, Fabian D, Koppel J, Čikoš Š. Stress exposure during the preimplantation period affects blastocyst lineages and offspring development. J Reprod Dev 2015; 61:325-31. [PMID: 25985793 PMCID: PMC4547990 DOI: 10.1262/jrd.2015-012] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We found retardation of preimplantation embryo growth after exposure to maternal restraint stress during the preimplantation period in our previous study. In the present study, we evaluated the impact of preimplantation maternal restraint stress on the distribution of inner cell mass (ICM) and trophectoderm (TE) cells in mouse blastocysts, and its possible effect on physiological development of offspring. We exposed spontaneously ovulating female mice to restraint stress for 30 min three times a day during the preimplantation period, and this treatment caused a significant increase in blood serum corticosterone concentration. Microscopic evaluation of embryos showed that restraint stress significantly decreased cell counts per blastocyst. Comparing the effect of restraint stress on the two blastocyst cell lineages, we found that the reduction in TE cells was more substantial than the reduction in ICM cells, which resulted in an increased ICM/TE ratio in blastocysts isolated
from stressed dams compared with controls. Restraint stress reduced the number of implantation sites in uteri, significantly delayed eye opening in delivered mice, and altered their behavior in terms of two parameters (scratching on the base of an open field test apparatus, time spent in central zone) as well. Moreover, prenatally stressed offspring had significantly lower body weights and in 5-week old females delivered from stressed dams, fat deposits were significantly lower. Our results indicate that exposure to stress during very early pregnancy can have a negative impact on embryonic development with consequences reaching into postnatal life.
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Affiliation(s)
- Ján Burkuš
- Institute of Animal Physiology, Slovak Academy of Sciences, Košice, 04001, Slovak Republic
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86
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Abstract
The early embryo and periconceptional period is a window during which environmental factors may cause permanent change in the pattern and characteristics of development leading to risk of adult onset disease. This has now been demonstrated across small and large animal models and also in the human. Most evidence of periconceptional 'programming' has emerged from maternal nutritional models but also other in vivo and in vitro conditions including assisted reproductive treatments, show consistent outcomes. This short review first reports on the range of environmental in vivo and in vitro periconceptional models and resulting long-term outcomes. Second, it uses the rodent maternal low protein diet model restricted to the preimplantation period and considers the stepwise maternal-embryonic dialogue that comprises the induction of programming. This dialogue leads to cellular and epigenetic responses by the embryo, mainly identified in the extra-embryonic cell lineages, and underpins an apparently permanent change in the growth trajectory during pregnancy and associates with increased cardiometabolic and behavioural disease in adulthood. We recognize the important advice of David Barker some years ago to investigate the sensitivity of the early embryo to developmental programming, an insight for which we are grateful.
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87
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Watkins AJ, Lucas ES, Marfy-Smith S, Bates N, Kimber SJ, Fleming TP. Maternal nutrition modifies trophoblast giant cell phenotype and fetal growth in mice. Reproduction 2015; 149:563-75. [PMID: 25755287 PMCID: PMC4418750 DOI: 10.1530/rep-14-0667] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 03/09/2015] [Indexed: 01/15/2023]
Abstract
Mammalian placentation is dependent upon the action of trophoblast cells at the time of implantation. Appropriate fetal growth, regulated by maternal nutrition and nutrient transport across the placenta, is a critical factor for adult offspring long-term health. We have demonstrated that a mouse maternal low-protein diet (LPD) fed exclusively during preimplantation development (Emb-LPD) increases offspring growth but programmes adult cardiovascular and metabolic disease. In this study, we investigate the impact of maternal nutrition on post-implantation trophoblast phenotype and fetal growth. Ectoplacental cone explants were isolated at day 8 of gestation from female mice fed either normal protein diet (NPD: 18% casein), LPD (9% casein) or Emb-LPD and cultured in vitro. We observed enhanced spreading and cell division within proliferative and secondary trophoblast giant cells (TGCs) emerging from explants isolated from LPD-fed females when compared with NPD and Emb-LPD explants after 24 and 48 h. Moreover, both LPD and Emb-LPD explants showed substantial expansion of TGC area during 24–48 h, not observed in NPD. No difference in invasive capacity was observed between treatments using Matrigel transwell migration assays. At day 17 of gestation, LPD- and Emb-LPD-fed conceptuses displayed smaller placentas and larger fetuses respectively, resulting in increased fetal:placental ratios in both groups compared with NPD conceptuses. Analysis of placental and yolk sac nutrient signalling within the mammalian target of rapamycin complex 1 pathway revealed similar levels of total and phosphorylated downstream targets across groups. These data demonstrate that early post-implantation embryos modify trophoblast phenotype to regulate fetal growth under conditions of poor maternal nutrition.
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Affiliation(s)
- Adam J Watkins
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| | - Emma S Lucas
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| | - Stephanie Marfy-Smith
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| | - Nicola Bates
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| | - Susan J Kimber
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| | - Tom P Fleming
- Centre for Biological SciencesSouthampton General Hospital, University of Southampton, Southampton SO16 6YD, UKSchool of Life and Health SciencesAston Research Centre for Healthy Ageing, Aston University, Birmingham B4 7ET, UKFaculty of Life SciencesUniversity of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
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88
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Zander-Fox DL, Fullston T, McPherson NO, Sandeman L, Kang WX, Good SB, Spillane M, Lane M. Reduction of Mitochondrial Function by FCCP During Mouse Cleavage Stage Embryo Culture Reduces Birth Weight and Impairs the Metabolic Health of Offspring. Biol Reprod 2015; 92:124. [PMID: 25715796 DOI: 10.1095/biolreprod.114.123489] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 02/24/2015] [Indexed: 12/26/2022] Open
Abstract
The periconceptual environment represents a critical window for programming fetal growth trajectories and susceptibility to disease; however, the underlying mechanism responsible for programming remains elusive. This study demonstrates a causal link between reduction of precompaction embryonic mitochondrial function and perturbed offspring growth trajectories and subsequent metabolic dysfunction. Incubation of embryos with carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone (FCCP), which uncouples mitochondrial oxidative phosphorylation, significantly reduced mitochondrial membrane potential and ATP production in 8-cell embryos and the number of inner cell mass cells within blastocysts; however, blastocyst development was unchanged. This perturbed embryonic mitochondrial function was concomitant with reduced birth weight in female offspring following embryo transfer, which persisted until weaning. FCCP-treated females also exhibited increased adiposity at 4 wk, increased adiposity gain between 4 and 14 wk, glucose intolerance at 8 wk, and insulin resistance at 14 wk. Although FCCP-treated males also exhibited reduced glucose tolerance, but their insulin sensitivity and adiposity gain between 4 and 14 wk was unchanged. To our knowledge, this is one of the first studies to demonstrate that reducing mitochondrial function and, thus, decreasing ATP output in the precompacting embryo can influence offspring phenotype. This is of great significance as a large proportion of patients requiring assisted reproductive technologies are of advanced maternal age or have a high body mass index, both of which have been independently linked with perturbed early embryonic mitochondrial function.
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Affiliation(s)
- Deirdre L Zander-Fox
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia Repromed, Dulwich, South Australia, Australia
| | - Tod Fullston
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Nicole O McPherson
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Lauren Sandeman
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Wan Xian Kang
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Suzanne B Good
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Marni Spillane
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Michelle Lane
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia Repromed, Dulwich, South Australia, Australia
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89
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Endoplasmic reticulum stress signaling in mammalian oocytes and embryos: life in balance. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2015; 316:227-65. [PMID: 25805126 DOI: 10.1016/bs.ircmb.2015.01.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mammalian oocytes and embryos are exquisitely sensitive to a wide range of insults related to physical stress, chemical exposure, and exposures to adverse maternal nutrition or health status. Although cells manifest specific responses to various stressors, many of these stressors intersect at the endoplasmic reticulum (ER), where disruptions in protein folding and production of reactive oxygen species initiate downstream signaling events. These signals modulate mRNA translation and gene transcription, leading to recovery, activation of autophagy, or with severe and prolonged stress, apoptosis. ER stress signaling has recently come to the fore as a major contributor to embryo demise. Accordingly, agents that modulate or inhibit ER stress signaling have yielded beneficial effects on embryo survival and long-term developmental potential. We review here the mechanisms of ER stress signaling, their connections to mammalian oocytes and embryos, and the promising indications that interventions in this pathway may provide new opportunities for improving mammalian reproduction and health.
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90
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Padhee M, Zhang S, Lie S, Wang KC, Botting KJ, McMillen IC, MacLaughlin SM, Morrison JL. The periconceptional environment and cardiovascular disease: does in vitro embryo culture and transfer influence cardiovascular development and health? Nutrients 2015; 7:1378-425. [PMID: 25699984 PMCID: PMC4377860 DOI: 10.3390/nu7031378] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/22/2015] [Accepted: 01/30/2015] [Indexed: 02/07/2023] Open
Abstract
Assisted Reproductive Technologies (ARTs) have revolutionised reproductive medicine; however, reports assessing the effects of ARTs have raised concerns about the immediate and long-term health outcomes of the children conceived through ARTs. ARTs include manipulations during the periconceptional period, which coincides with an environmentally sensitive period of gamete/embryo development and as such may alter cardiovascular development and health of the offspring in postnatal life. In order to identify the association between ARTs and cardiovascular health outcomes, it is important to understand the events that occur during the periconceptional period and how they are affected by procedures involved in ARTs. This review will highlight the emerging evidence implicating adverse cardiovascular outcomes before and after birth in offspring conceived through ARTs in both human and animal studies. In addition, it will identify the potential underlying causes and molecular mechanisms responsible for the congenital and adult cardiovascular dysfunctions in offspring whom were conceived through ARTs.
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Affiliation(s)
- Monalisa Padhee
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Song Zhang
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Shervi Lie
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Kimberley C Wang
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Kimberley J Botting
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - I Caroline McMillen
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Severence M MacLaughlin
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
| | - Janna L Morrison
- Early Origins of Adult Health Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA 5001, Australia.
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91
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Kermack AJ, Finn-Sell S, Cheong YC, Brook N, Eckert JJ, Macklon NS, Houghton FD. Amino acid composition of human uterine fluid: association with age, lifestyle and gynaecological pathology. Hum Reprod 2015; 30:917-24. [PMID: 25697730 PMCID: PMC4359399 DOI: 10.1093/humrep/dev008] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
STUDY QUESTION Do the amino acid levels of human uterine fluid vary with age, BMI, phase of menstrual cycle, benign pathology or diet? SUMMARY ANSWER The levels of 18 amino acids in human uterine fluid were shown to be affected only by maternal diet. WHAT IS KNOWN ALREADY Murine, bovine and ovine uterine amino acid content has been reported, but no reliable data on the human exist. Murine studies have demonstrated that the intrauterine periconceptional nutritional environment is affected by maternal diet. STUDY DESIGN, SIZE, DURATION Uterine secretions were aspirated from 56 women aged 18–45 years. The women were recruited preoperatively from gynaecological theatre operating schedules or hysterosalpingo-contrast-sonography (HyCoSy) lists. A proportion of these women had proven fertility; however, the majority were being investigated for subfertility. The BMI, gynaecological history and dietary pattern of these women were also assessed. PARTICIPANTS/MATERIALS, SETTING, METHODS Reverse phase high performance liquid chromatography was used to analyse the concentrations of 18 amino acids within the uterine fluid and blood serum. The results were analysed against the women's stage of cycle, age, BMI and diet. MAIN RESULTS AND THE ROLE OF CHANCE The profile of 18 amino acids in uterine fluid was described. In total, human uterine fluid was observed to contain an amino acid concentration of 3.54 mM (interquartile range: 2.27–6.24 mM). The relative concentrations of 18 amino acids were not significantly altered by age, BMI, cycle phase or the presence of specific benign gynaecological pathologies. However, a diet identified by a validated scoring system as being less healthy was associated with higher concentrations of asparagine (P = 0.018), histidine (P = 0.011), serine (P = 0.033), glutamine (P = 0.049), valine (P = 0.025), phenylalanine (P = 0.019), isoleucine (P = 0.025) and leucine (P = 0.043) in the uterine fluid compared with a healthier diet, defined as one with a higher intake of fresh vegetables, fruit, whole-grain products and fish and a low intake of red and processed meat and high fat dairy products. There were no significant correlations between serum amino acid concentrations and those in the uterine fluid. LIMITATIONS, REASONS FOR CAUTION Our results enabled us to detect the effect of diet on the concentrations of amino acids in human uterine fluid; however, the study may not have had sufficient numbers to detect mild effects of BMI or age. WIDER IMPLICATIONS OF THE FINDINGS These findings increase our understanding of the nutritional environment encountered by the preimplantation embryo, and indicate how periconceptional diet may alter this. Given the importance of early embryo environment for programming of development and future health, this information may aid in the development of nutritional interventions aimed at optimizing the preimplantation phase of human embryo development in vivo. STUDY FUNDING/COMPETING INTEREST(S) This work was funded by the NIHR, the Medical Research Council (G0701153) and the University of Southampton and was supported by the NIHR BRC in Nutrition and Southampton University NHS Foundation Trust. The authors declare no conflicts of interest.
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Affiliation(s)
- Alexandra J Kermack
- Centre for Human Development, Stem Cells & Regeneration, University of Southampton, Southampton SO16 6YD, UK Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK Complete Fertility Centre, Department of Obstetrics & Gynaecology, Princess Anne Hospital, Southampton SO16 6YD, UK NIHR BRC in Nutrition Southampton, Southampton SO16 6YD, UK
| | - Sarah Finn-Sell
- Centre for Human Development, Stem Cells & Regeneration, University of Southampton, Southampton SO16 6YD, UK Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK
| | - Ying C Cheong
- Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK Complete Fertility Centre, Department of Obstetrics & Gynaecology, Princess Anne Hospital, Southampton SO16 6YD, UK
| | - Nicholas Brook
- Complete Fertility Centre, Department of Obstetrics & Gynaecology, Princess Anne Hospital, Southampton SO16 6YD, UK
| | - Judith J Eckert
- Centre for Human Development, Stem Cells & Regeneration, University of Southampton, Southampton SO16 6YD, UK Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK
| | - Nick S Macklon
- Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK Complete Fertility Centre, Department of Obstetrics & Gynaecology, Princess Anne Hospital, Southampton SO16 6YD, UK NIHR BRC in Nutrition Southampton, Southampton SO16 6YD, UK
| | - Franchesca D Houghton
- Centre for Human Development, Stem Cells & Regeneration, University of Southampton, Southampton SO16 6YD, UK Academic Unit of Human Development & Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK
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92
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Master JS, Thouas GA, Harvey AJ, Sheedy JR, Hannan NJ, Gardner DK, Wlodek ME. Low female birth weight and advanced maternal age programme alterations in next-generation blastocyst development. Reproduction 2015; 149:497-510. [PMID: 25667431 DOI: 10.1530/rep-14-0619] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Low birth weight is associated with an increased risk for adult disease development with recent studies highlighting transmission to subsequent generations. However, the mechanisms and timing of programming of disease transmission to the next generation remain unknown. The aim of this study was to examine the effects of low birth weight and advanced maternal age on second-generation preimplantation blastocysts. Uteroplacental insufficiency or sham surgery was performed in late-gestation WKY pregnant rats, giving rise to first-generation (F1) restricted (born small) and control offspring respectively. F1 control and restricted females, at 4 or 12 months of age, were naturally mated with normal males. Second-generation (F2) blastocysts from restricted females displayed reduced expression of genes related to growth compared with F2 control (P<0.05). Following 24 h culture, F2 restricted blastocysts had accelerated development, with increased total cell number, a result of increased trophectoderm cells compared with control (P<0.05). There were alterations in carbohydrate and serine utilisation in F2 restricted blastocysts and F2 restricted outgrowths from 4-month-old females respectively (P<0.05). F2 blastocysts from aged restricted females were developmentally delayed at retrieval, with reduced total cell number attributable to reduced trophectoderm number with changes in carbohydrate utilisation (P<0.05). Advanced maternal age resulted in alterations in a number of amino acids in media obtained from F2 blastocyst outgrowths (P<0.05). These findings demonstrate that growth restriction and advanced maternal age can alter F2 preimplantation embryo physiology and the subsequent offspring growth.
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Affiliation(s)
- Jordanna S Master
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - George A Thouas
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - Alexandra J Harvey
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - John R Sheedy
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - Natalie J Hannan
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - David K Gardner
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
| | - Mary E Wlodek
- Department of PhysiologySchool of BioSciencesThe University of Melbourne, Parkville, Victoria 3010, AustraliaDepartment of Obstetrics and GynaecologyMercy Hospital, The University of Melbourne, Heidelberg, Victoria 3084, Australia
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93
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Sun C, Denisenko O, Sheth B, Cox A, Lucas ES, Smyth NR, Fleming TP. Epigenetic regulation of histone modifications and Gata6 gene expression induced by maternal diet in mouse embryoid bodies in a model of developmental programming. BMC DEVELOPMENTAL BIOLOGY 2015; 15:3. [PMID: 25609498 PMCID: PMC4305257 DOI: 10.1186/s12861-015-0053-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 01/06/2015] [Indexed: 01/02/2023]
Abstract
Background Dietary interventions during pregnancy alter offspring fitness. We have shown mouse maternal low protein diet fed exclusively for the preimplantation period (Emb-LPD) before return to normal protein diet (NPD) for the rest of gestation, is sufficient to cause adult offspring cardiovascular and metabolic disease. Moreover, Emb-LPD blastocysts sense altered nutrition within the uterus and activate compensatory cellular responses including stimulated endocytosis within extra-embryonic trophectoderm and primitive endoderm (PE) lineages to protect fetal growth rate. However, these responses associate with later disease. Here, we investigate epigenetic mechanisms underlying nutritional programming of PE that may contribute to its altered phenotype, stabilised during subsequent development. We use embryonic stem (ES) cell lines established previously from Emb-LPD and NPD blastocysts that were differentiated into embryoid bodies (EBs) with outer PE-like layer. Results Emb-LPD EBs grow to a larger size than NPD EBs and express reduced Gata6 transcription factor (regulator of PE differentiation) at mRNA and protein levels, similar to Emb-LPD PE derivative visceral yolk sac tissue in vivo in later gestation. We analysed histone modifications at the Gata6 promoter in Emb-LPD EBs using chromatin immunoprecipitation assay. We found significant reduction in histone H3 and H4 acetylation and RNA polymerase II binding compared with NPD EBs, all markers of reduced transcription. Other histone modifications, H3K4Me2, H3K9Me3 and H3K27Me3, were unaltered. A similar but generally non-significant histone modification pattern was found on the Gata4 promoter. Consistent with these changes, histone deacetylase Hdac-1, but not Hdac-3, gene expression was upregulated in Emb-LPD EBs. Conclusions First, these data demonstrate ES cells and EBs retain and propagate nutritional programming adaptations in vitro, suitable for molecular analysis of mechanisms, reducing animal use. Second, they reveal maternal diet induces persistent changes in histone modifications to regulate Gata6 expression and PE growth and differentiation that may affect lifetime health.
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Affiliation(s)
| | | | | | | | | | | | - Tom P Fleming
- Centre for Biological Sciences, University of Southampton, Mailpoint 840, Level D Lab & Path Block, Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK.
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94
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Fleming TP, Watkins AJ, Sun C, Velazquez MA, Smyth NR, Eckert JJ. Do little embryos make big decisions? How maternal dietary protein restriction can permanently change an embryo’s potential, affecting adult health. Reprod Fertil Dev 2015; 27:684-92. [DOI: 10.1071/rd14455] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 02/03/2015] [Indexed: 01/01/2023] Open
Abstract
Periconceptional environment may influence embryo development, ultimately affecting adult health. Here, we review the rodent model of maternal low-protein diet specifically during the preimplantation period (Emb-LPD) with normal nutrition during subsequent gestation and postnatally. This model, studied mainly in the mouse, leads to cardiovascular, metabolic and behavioural disease in adult offspring, with females more susceptible. We evaluate the sequence of events from diet administration that may lead to adult disease. Emb-LPD changes maternal serum and/or uterine fluid metabolite composition, notably with reduced insulin and branched-chain amino acids. This is sensed by blastocysts through reduced mammalian target of rapamycin complex 1 signalling. Embryos respond by permanently changing the pattern of development of their extra-embryonic lineages, trophectoderm and primitive endoderm, to enhance maternal nutrient retrieval during subsequent gestation. These compensatory changes include stimulation in proliferation, endocytosis and cellular motility, and epigenetic mechanisms underlying them are being identified. Collectively, these responses act to protect fetal growth and likely contribute to offspring competitive fitness. However, the resulting growth adversely affects long-term health because perinatal weight positively correlates with adult disease risk. We argue that periconception environmental responses reflect developmental plasticity and ‘decisions’ made by embryos to optimise their own development, but with lasting consequences.
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95
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Vaughan OR, Phillips HM, Everden AJ, Sferruzzi-Perri AN, Fowden AL. Dexamethasone treatment of pregnant F0 mice leads to parent of origin-specific changes in placental function of the F2 generation. Reprod Fertil Dev 2015; 27:704-11. [DOI: 10.1071/rd14285] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 01/08/2015] [Indexed: 02/05/2023] Open
Abstract
Dexamethasone treatment of F0 pregnant rodents alters F1 placental function and adult cardiometabolic phenotype. The adult phenotype is transmitted to the F2 generation without further intervention, but whether F2 placental function is altered by F0 dexamethasone treatment remains unknown. In the present study, F0 mice were untreated or received dexamethasone (0.2 µg g–1 day–1, s.c.) over Days 11–15 or 14–18 of pregnancy (term Day 21). Depending on the period of F0 dexamethasone treatment, F1 offspring were lighter at birth or grew more slowly until weaning (P < 0.05). Glucose tolerance (1 g kg–1, i.p.) of adult F1 males was abnormal. Mating F1 males exposed prenatally to dexamethasone with untreated females had no effect on F2 placental function on Day 19 of pregnancy. In contrast, when F1 females were mated with untreated males, F2 placental clearance of the amino acid analogue 14C-methylaminoisobutyric acid was increased by 75% on Day 19 specifically in dams prenatally exposed to dexamethasone on Days 14–18 (P < 0.05). Maternal plasma corticosterone was also increased, but F2 placental Slc38a4 expression was decreased in these dams (P < 0.05). F0 dexamethasone treatment had no effect on F2 fetal or placental weights, regardless of lineage. Therefore, the effects of F0 dexamethasone exposure are transmitted intergenerationally to the F2 placenta via the maternal, but not paternal, line.
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96
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Zheng J, Xiao X, Zhang Q, Yu M, Xu J, Wang Z. Maternal protein restriction induces early-onset glucose intolerance and alters hepatic genes expression in the peroxisome proliferator-activated receptor pathway in offspring. J Diabetes Investig 2014; 6:269-79. [PMID: 25969711 PMCID: PMC4420558 DOI: 10.1111/jdi.12303] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 08/05/2014] [Accepted: 10/21/2014] [Indexed: 02/06/2023] Open
Abstract
Aims/Introduction Maternal undernutrition during pregnancy and/or lactation can alter the offspring's response to environmental challenges, and thus increases the risk of the development of metabolic diseases at a later age. However, whether maternal protein restriction can modulate glucose metabolism in the early life of offspring is less understood. Furthermore, we explored the potential underlying mechanisms that illustrate this phenotype. Materials and Methods To test this hypothesis, we examined the offspring of C57BL/6J mice at weaning to determine the effects of feeding their mothers a low-protein diet or normal chow diet throughout pregnancy and lactation. Gene array experiments and quantitative real-time polymerase chain reaction were utilized to explore the altered hepatic genes expression. Results The offspring of dams fed a low-protein diet had a lower birthweight and bodyweight, impaired glucose tolerance, decreased insulin sensitivity, and decreased serum cholesterol at weaning. Using gene array experiments, 253 differentially expressed genes were identified in the liver tissues of the offspring between the two groups. Bioinformatic analyses showed that all differentially expressed genes were mapped to 11 pathways. We focused on the ‘peroxisome proliferator-activated receptor signaling pathway,’ because peroxisome proliferator-activated receptors have emerged as central regulators of glucose and lipid homeostasis. Quantitative real-time polymerase chain reaction was utilized for the validation of genes in the pathway. Conclusions A maternal low-protein diet during pregnancy and lactation promotes early-onset glucose intolerance in the offspring mice, and the altered hepatic genes expression in peroxisome proliferator-activated receptor signaling pathway could play role in regulating this phenomenon.
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Affiliation(s)
- Jia Zheng
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
| | - Xinhua Xiao
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
| | - Qian Zhang
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
| | - Miao Yu
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
| | - Jianping Xu
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
| | - Zhixin Wang
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Diabetes Research Center of Chinese Academy of Medical Sciences & Peking Union Medical College Beijing, China
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97
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Chen M, Wu L, Wu F, Wittert GA, Norman RJ, Robker RL, Heilbronn LK. Impaired glucose metabolism in response to high fat diet in female mice conceived by in vitro fertilization (IVF) or ovarian stimulation alone. PLoS One 2014; 9:e113155. [PMID: 25405530 PMCID: PMC4236136 DOI: 10.1371/journal.pone.0113155] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Accepted: 10/20/2014] [Indexed: 12/20/2022] Open
Abstract
Individuals conceived by in vitro fertilization (IVF) may be at increased risk of cardio-metabolic disorders. We recently reported that IVF conceived male mice displayed impaired glucose metabolism at normal and high body weights. In this study, we examined glucose metabolism in mature female C57BL/6J mice that were conceived by natural conception (NC), by ovarian stimulation (OS) or by IVF following chow or high-fat diet (HFD) for 8 weeks. By design, litter size was comparable between groups, but interestingly the birth weight of IVF and OS females was lower than NC females (p ≤ 0.001). Mature IVF female mice displayed increased fasting glucose as compared to NC and OS mice, irrespective of diet. Mature IVF and OS mice were also more susceptible to the metabolic consequences of high fat diet as compared with NC females, with impaired glucose tolerance (p ≤ 0.01), whereas peripheral insulin resistance and increased hepatic expression of gluconeogenic genes Ppargc1α, Pck1 and G6pc was observed in IVF mice only (p<0.05). This study suggests that ovarian stimulation alone and IVF program distinct metabolic effects in females, but that high fat diet may be required to unmask these effects. This study adds to the growing body of literature that assisted reproduction procedures may increase the risk of developing type 2 diabetes in an obesity prone environment.
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Affiliation(s)
- Miaoxin Chen
- Robinson Research Institute, School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia, 5005
- Department of Obstetrics and Gynaecology, The Affiliated Hospital of Guiyang Medical College, Guiyang, China, 550004
- Discipline of Medicine, The University of Adelaide, Adelaide, Australia, 5005
| | - Linda Wu
- Robinson Research Institute, School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia, 5005
| | - Fang Wu
- Discipline of Medicine, The University of Adelaide, Adelaide, Australia, 5005
- Department of Emergency, The Affiliated Hospital of Guiyang Medical College, Guiyang, China, 550004
| | - Gary A. Wittert
- Discipline of Medicine, The University of Adelaide, Adelaide, Australia, 5005
| | - Robert J. Norman
- Robinson Research Institute, School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia, 5005
| | - Rebecca L. Robker
- Robinson Research Institute, School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia, 5005
| | - Leonie K. Heilbronn
- Robinson Research Institute, School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia, 5005
- Discipline of Medicine, The University of Adelaide, Adelaide, Australia, 5005
- * E-mail:
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98
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Kermack AJ, Calder PC, Houghton FD, Godfrey KM, Macklon NS. A randomised controlled trial of a preconceptional dietary intervention in women undergoing IVF treatment (PREPARE trial). BMC WOMENS HEALTH 2014; 14:130. [PMID: 25407227 PMCID: PMC4289275 DOI: 10.1186/1472-6874-14-130] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 10/07/2014] [Indexed: 01/04/2023]
Abstract
Background In vitro fertilisation (IVF) treatment provides an opportunity to study early developmental responses to periconceptional dietary interventions. Retrospective studies have suggested links between preconception diet and fertility, and more recently, a "Mediterranean" diet has been reported to increase pregnancy rates by up to 40%. In addition, a prospective study examining increased intake of omega-3 polyunsaturated fats demonstrated a quickened rate of embryo development after IVF. However, up to now, few prospective randomised controlled trials have investigated the impact of periconceptional dietary interventions on fertility outcomes. Methods and design The study is a randomised controlled trial of a dietary intervention consisting of olive oil for cooking, an olive oil based spread, and a daily supplement drink enriched with Vitamin D (10 microgram daily) and marine omega-3 fatty acids (2 g daily) for 6 weeks preconception versus a control diet of sunflower seed oil for cooking, a sunflower oil based spread, and a daily supplement drink without added Vitamin D or marine omega-3 fatty acids. Couples undergoing IVF will be randomised to either the intervention or control group (55 in each arm). The primary endpoint is embryo developmental competency in vitro, measured by validated morphokinetic markers. Secondary outcomes will include the effect of the dietary intervention on the nutritional content of the intrauterine environment. Discussion This approach will enable rigorous examination of the impact of the dietary intervention on early embryo development, together with the influence of the peri-implantation intra-uterine nutritional environment. Trial registration ISRCTN50956936
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Affiliation(s)
- Alexandra J Kermack
- Human Development and Health Academic Unit, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK.
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99
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Hanson MA, Gluckman PD. Early developmental conditioning of later health and disease: physiology or pathophysiology? Physiol Rev 2014; 94:1027-76. [PMID: 25287859 PMCID: PMC4187033 DOI: 10.1152/physrev.00029.2013] [Citation(s) in RCA: 717] [Impact Index Per Article: 71.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Extensive experimental animal studies and epidemiological observations have shown that environmental influences during early development affect the risk of later pathophysiological processes associated with chronic, especially noncommunicable, disease (NCD). This field is recognized as the developmental origins of health and disease (DOHaD). We discuss the extent to which DOHaD represents the result of the physiological processes of developmental plasticity, which may have potential adverse consequences in terms of NCD risk later, or whether it is the manifestation of pathophysiological processes acting in early life but only becoming apparent as disease later. We argue that the evidence suggests the former, through the operation of conditioning processes induced across the normal range of developmental environments, and we summarize current knowledge of the physiological processes involved. The adaptive pathway to later risk accords with current concepts in evolutionary developmental biology, especially those concerning parental effects. Outside the normal range, effects on development can result in nonadaptive processes, and we review their underlying mechanisms and consequences. New concepts concerning the underlying epigenetic and other mechanisms involved in both disruptive and nondisruptive pathways to disease are reviewed, including the evidence for transgenerational passage of risk from both maternal and paternal lines. These concepts have wider implications for understanding the causes and possible prevention of NCDs such as type 2 diabetes and cardiovascular disease, for broader social policy and for the increasing attention paid in public health to the lifecourse approach to NCD prevention.
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Affiliation(s)
- M A Hanson
- Academic Unit of Human Development and Health, University of Southampton, and NIHR Nutrition Biomedical Research Centre, University Hospital, Southampton, United Kingdom; and Liggins Institute and Gravida (National Centre for Growth and Development), University of Auckland, Auckland, New Zealand
| | - P D Gluckman
- Academic Unit of Human Development and Health, University of Southampton, and NIHR Nutrition Biomedical Research Centre, University Hospital, Southampton, United Kingdom; and Liggins Institute and Gravida (National Centre for Growth and Development), University of Auckland, Auckland, New Zealand
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100
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Programming of the preimplantation embryo by the embryokine colony stimulating factor 2. Anim Reprod Sci 2014; 149:59-66. [DOI: 10.1016/j.anireprosci.2014.05.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 05/26/2014] [Indexed: 11/17/2022]
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