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Patil SS, Puttaswamy N, Cardenas A, Barr DB, Ghosh S, Balakrishnan K. Protocol for CARES-HAPIN: an ambidirectional cohort study on exposure to environmental tobacco smoke and risk of early childhood caries. BMJ Open 2024; 14:e083874. [PMID: 38749682 PMCID: PMC11097839 DOI: 10.1136/bmjopen-2024-083874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 04/09/2024] [Indexed: 05/18/2024] Open
Abstract
INTRODUCTION Prenatal and postnatal exposure to environmental tobacco smoke (ETS) has been linked with early childhood caries (ECC), but the specific molecular mechanisms and pathways remain largely unknown. The Caries Risk from exposure to Environmental tobacco Smoke (CARES) within the Household Air Pollution Intervention Network (HAPIN) study aims to establish the association between ETS and ECC by employing epidemiological and novel biomarker-based approaches. Here, we outline the overall design and rationale of the project. METHODS AND ANALYSIS We will leverage the infrastructure and data from the HAPIN trial (India) to mount the CARES study. In this ambidirectional cohort study, children (n=735, aged: 3-5 years) will undergo ECC examination by a trained dentist using standard criteria and calibrated methods. Structured questionnaires will be used to gather information on sociodemographic variables, dietary habits, oral hygiene, oral health-related quality of life and current exposure to ETS. We will collect non-invasive or minimally invasive biospecimens (i.e., saliva, buccal cells, dried blood spots and urine) from a subset of HAPIN children (n=120) to assess a battery of biomarkers indicative of exposure to ETS, early biological effect and epigenetic modifications. Both self-reported and objective measures of ETS exposure collected longitudinally during in utero and early postnatal periods will be accessed from the HAPIN database. We will apply current science data techniques to assess the association and interrelationships between ETS, ECC, and multiple biomarkers. ETHICS AND DISSEMINATION Information gathered in this research will be published in peer-reviewed journals and summaries will be shared with the key stakeholders as well as patients and their parents/guardians involved in this study. Sri Ramachandra Institute of Higher Education and Research Ethics Board has approved the study protocol (IEC-NI22/JUL/83/82). TRIAL REGISTRATION NUMBER NCT02944682.
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Affiliation(s)
- Sneha S Patil
- Department of Environmental Health Engineering, Faculty of Public Health, Sri Ramachandra Institute of Higher Education and Research (Deemed to be University), Chennai, Tamil Nadu, India
- Department of Pediatric and Preventive Dentistry, Dr. D.Y. Patil Dental College and Hospital, Dr. D.Y. Patil Vidyapeeth, Pune, Maharashtra, India
| | - Naveen Puttaswamy
- Department of Environmental Health Engineering, Faculty of Public Health, Sri Ramachandra Institute of Higher Education and Research (Deemed to be University), Chennai, Tamil Nadu, India
| | - Andres Cardenas
- Department of Epidemiology and Population Health, Stanford University, Stanford, California, USA
| | - Dana Boyd Barr
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
| | - Santu Ghosh
- Department of Biostatistics, St John's Medical College, Bengaluru, Karnataka, India
| | - Kalpana Balakrishnan
- Department of Environmental Health Engineering, Faculty of Public Health, Sri Ramachandra Institute of Higher Education and Research (Deemed to be University), Chennai, Tamil Nadu, India
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Lima SM, Ren X, Mu L, Ochs-Balcom HM, Palermo T. Food Insecurity, telomere length and the potential modifying effects of social support in National Health and Nutrition Examination Survey. Public Health Nutr 2023; 26:3005-3012. [PMID: 37734859 PMCID: PMC10755437 DOI: 10.1017/s1368980023002008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 08/03/2023] [Accepted: 09/05/2023] [Indexed: 09/23/2023]
Abstract
OBJECTIVE Telomere length (TL) is a posited pathway through which chronic stress results in biological dysregulation and subsequent adverse health outcomes. Food insecurity is associated with shorter TL. Social support, which is defined by the size and function of an individual's social network, is associated with better health outcomes. The present study assesses whether social support modifies the relationship between food security and TL. DESIGN Cross-sectional study design. Linear regression was used to assess the association between food insecurity and TL, stratified by social support level. A multiplicative interacted model was used to formally test modification. SETTING Data come from the National Health and Nutrition Examination Survey 1999-2000 and 2001-2002 waves. PARTICIPANTS Adults aged 60 years and older who have measurements for TL. RESULTS Our sample comprised 2674 participants, and 63·5 % of the total sample had low social support, with 13·3 % being food insecure. In fully adjusted models, food insecurity was negatively though modestly associated (P = 0·13) with TL. Associations between food insecurity and TL were significantly modified by social support (interaction P = 0·026), whereby food insecurity had a stronger effect among individuals with high social support (coefficient = -0·099 (95 % CI: -0·161, -0·038)) compared to low social support (coefficient = -0·001, (95 % CI: -0·033, 0·032)). CONCLUSION Food insecurity is modestly associated with shorter TL. Contrary to our hypothesis, food insecurity had more deleterious effects on TL among participants with high social support than low social support. Results may indicate that the food insecure population is a higher needs population, and increased social support reflects these needs rather than providing protective effects.
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Affiliation(s)
- Sarah M Lima
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY14214, USA
| | - Xuefeng Ren
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY14214, USA
| | - Lina Mu
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY14214, USA
| | - Heather M Ochs-Balcom
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY14214, USA
| | - Tia Palermo
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, State University of New York at Buffalo, Buffalo, NY14214, USA
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Howell MP, Jones CW, Herman CA, Mayne CV, Fernandez C, Theall KP, Esteves KC, Drury SS. Impact of prenatal tobacco smoking on infant telomere length trajectory and ADHD symptoms at 18 months: a longitudinal cohort study. BMC Med 2022; 20:153. [PMID: 35477473 PMCID: PMC9047258 DOI: 10.1186/s12916-022-02340-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 03/14/2022] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Prenatal maternal tobacco smoking is a predictor of child attention-deficit/hyperactivity disorder (ADHD) and is associated with offspring telomere length (TL). In this study, we examine the relationship between maternal prenatal smoking, infant TL, and maternal report of early childhood symptoms of ADHD. METHODS One-hundred and eighty-one mother-infant dyads were followed prospectively for the infant's first 18 months of life. Prenatal smoking was assessed from maternal report and medical records. TL was measured from infant buccal swab DNA obtained across the first 18 months of life. ADHD symptoms were obtained from maternal report on the Child Behavior Check List. Multiple regression models tested the relation between prenatal smoking and both ADHD symptoms and infant TL. Additional analyses tested whether the change in infant TL influenced the relation between prenatal smoking and ADHD symptoms. RESULTS Sixteen percent of mothers reported prenatal smoking. Infant TL at 4, 12, and 18 months of age were correlated. Consistent with previous cross-sectional studies linking shorter offspring TL to maternal prenatal smoking, maternal prenatal smoking predicted greater telomere shortening from four to 18 months of infant age (β = - 5.797, 95% CI [-10.207, -1.386]; p = 0.010). Maternal depression was positively associated with both prenatal smoking (odds ratio (OR): 4.614, 95% CI [1.733, 12.282]; p = 0.002) and child ADHD symptoms (β = 4.713, 95% CI [2.073, 7.354]; p = 0.0006). To prevent confounding, analyses examined the relation between TL, ADHD symptoms, and prenatal smoking only in non-depressed mothers. In non-depressed mothers, infant TL attrition across the first 18 months moderated the relation between smoking and child ADHD. CONCLUSIONS The findings extend previous studies linking prenatal smoking to shorter infant TL by providing data demonstrating the effect on TL trajectory. The relation between prenatal smoking and early infant ADHD symptoms was moderated by the change in TL. The findings provide novel initial evidence suggesting that TL dynamics are one mechanistic pathway influencing the relation between maternal prenatal smoking and ADHD.
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Affiliation(s)
- Meghan P Howell
- Department of Pediatrics, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA
| | - Christopher W Jones
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Cade A Herman
- Tufts University School of Medicine, Boston, MA, USA
| | - Celia V Mayne
- Department of Psychiatry and Behavioral Science, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA
| | - Camilo Fernandez
- Department of Orthopedic Surgery, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA.,Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
| | - Katherine P Theall
- Global Community Health and Behavioral Sciences, Tulane University School of Public Health and Tropical Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA
| | - Kyle C Esteves
- Clinical Neuroscience Research Center, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA
| | - Stacy S Drury
- Department of Pediatrics, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA. .,Department of Psychiatry and Behavioral Science, Tulane University School of Medicine, 1430 Tulane Avenue, #8526, New Orleans, Louisiana, 70112, USA.
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Stout-Oswald SA, Glynn LM, Bisoffi M, Demers CH, Davis EP. Prenatal exposure to maternal psychological distress and telomere length in childhood. Dev Psychobiol 2022; 64:e22238. [PMID: 35050506 DOI: 10.1002/dev.22238] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 10/07/2021] [Accepted: 11/07/2021] [Indexed: 09/02/2023]
Abstract
Telomere length (TL) is a biological marker of cellular aging, and shorter TL in adulthood is associated with increased morbidity and mortality risk. It is likely that these differences in TL are established long before adulthood, and there is growing evidence that TL can reflect prenatal experiences. Although maternal prenatal distress predicts newborn TL, it is unknown whether the relation between prenatal exposure to maternal distress and child TL persists through childhood. The purpose of the current longitudinal, prospective study is to examine the relation between prenatal exposure to maternal distress (perceived stress, depressive symptoms, pregnancy-related anxiety) and TL in childhood. Participants included 102 children (54 girls) and their mothers. Mothers' distress was assessed five times during pregnancy, at 12 weeks postpartum, and at the time of child telomere measurement between 6 and 16 years of age. Maternal distress during pregnancy predicted shorter offspring TL in childhood, even after accounting for postnatal exposure to maternal distress and other covariates. These findings indicate that maternal mental health predicts offspring TL biology later in childhood than previously observed. This study bolsters claims that telomere biology is subject to fetal programming and highlights the importance of supporting maternal mental health during pregnancy.
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Affiliation(s)
| | - Laura M Glynn
- Department of Psychology, Chapman University, Orange, California, USA
| | - Marco Bisoffi
- Department of Psychology, Chapman University, Orange, California, USA
- Schmid College of Science and Technology, Chapman University, Orange, California, USA
- School of Pharmacy, Chapman University, Orange, California, USA
| | - Catherine H Demers
- Department of Psychology, University of Denver, Denver, Colorado, USA
- Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Elysia Poggi Davis
- Department of Psychology, University of Denver, Denver, Colorado, USA
- Department of Pediatrics, University of California, Irvine, Irvine, California, USA
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Miri M, de Prado-Bert P, Alahabadi A, Najafi ML, Rad A, Moslem A, Aval HE, Ehrampoush MH, Bustamante M, Zare Sakhvidi MJ, Nawrot T, Sunyer J, Dadvand P. Association of greenspace exposure with telomere length in preschool children. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115228. [PMID: 32763773 DOI: 10.1016/j.envpol.2020.115228] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 06/18/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
Exposure to greenspace has been associated with a wide range of health benefits; however, the available evidence on the association of this exposure with telomere length (TL), an early marker of ageing, is still scarce. We investigated the association of greenspace exposure with TL in a sample of 200 preschool children (aged 5-7 years) residing in Sabzevar, Iran (2017). We comprehensively characterized different aspects of greenspace exposure encompassing residential, kindergarten, and total (including both residential and kindergarten) surrounding greenspace (using satellite-derived Normalized Difference Vegetation Index), residential and kindergarten distance to green spaces, time spent in private gardens and public green spaces, and the number of plant pots at home. Relative leukocyte TL (LTL) in blood samples of the study participants was measured using quantitative polymerase chain reaction (qPCR). We applied mixed effects linear regression models with kindergarten and qPCR plate as random effects, to estimate the association of indicators of greenspace exposure (one at a time) with LTL, controlled for relevant covariates. We observed an inverse association between distance from home and kindergarten to green spaces larger than 5000 m2 and LTL. Moreover, higher total surrounding greenspace at 300m and 500m buffers and higher surrounding greenspace at 300m buffer around kindergarten and home were associated with longer LTL. Furthermore, longer time spent (h/week) in the public green spaces was associated with longer LTL. Our findings for residential and kindergarten distance to any green space (regardless of the size), residential surrounding greenspace at 100m and 500m buffers, kindergarten surrounding greenspace at 100m buffer, time spent in private gardens (h/week) and the number of plant pots at home were not conclusive. Our findings were generally suggestive for a positive association between greenspace exposure and LTL in preschool children. More studies are needed to confirm these findings in other settings with different climates and populations.
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Affiliation(s)
- Mohammad Miri
- Non-communicable Diseases Research Center, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Paula de Prado-Bert
- ISGlobal, Barcelona, Spain; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Ahmad Alahabadi
- Non-communicable Diseases Research Center, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Moslem Lari Najafi
- Pharmaceutical Sciences and Cosmetic Products Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Abolfazl Rad
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Alireza Moslem
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Hamideh Ebrahimi Aval
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Mohammad Hassan Ehrampoush
- Department of Environmental Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mariona Bustamante
- ISGlobal, Barcelona, Spain; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Mohammad Javad Zare Sakhvidi
- Occupational Health Research Center, Department of Occupational Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; Univ Rennes 1, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) UMR-S 1085, F-35000, Rennes, France
| | - Tim Nawrot
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium; Department of Public Health & Primary Care, Leuven University, Leuven, Belgium
| | - Jordi Sunyer
- ISGlobal, Barcelona, Spain; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Payam Dadvand
- ISGlobal, Barcelona, Spain; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain.
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Cuevas AG, Greatorex-Voith S, Abuelezam N, Eckert N, Assari S. Educational mobility and telomere length in middle-aged and older adults: testing three alternative hypotheses. BIODEMOGRAPHY AND SOCIAL BIOLOGY 2020; 66:220-235. [PMID: 34583600 DOI: 10.1080/19485565.2021.1983760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Critical period, social mobility, and social accumulation are three hypotheses that may explain how educational mobility impacts health. Thus far, there is little evidence on how these processes are associated with biological aging as measured by telomere length. Using cross-sectional data from the 2008 Health and Retirement Study, we examined the association between educational mobility (parental education and contemporaneous education) and telomere length. The final model is adjusted for sociodemographic factors and socioeconomic status, childhood adversity, and health behaviors/risk factors, as well as depressive symptoms. A total of 1,894 participants were included in the main analyses. High parental education was associated with longer telomere length in a fully adjusted model (B = 0.03, CI [0.002,0.07]). Downwardly mobile individuals (high parental education and low contemporaneous education) had longer telomere length compared to stably low individuals in a fully adjusted model (B = 0.05, CI [0.004,0.09]). There was support for the critical period hypothesis and partial support for the change hypothesis. There was no evidence to support the social accumulation hypothesis. Prospective studies are needed to understand the mechanism that can help further explain the association between educational mobility and telomere length.
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Affiliation(s)
- Adolfo G Cuevas
- Department of Community Health, Tufts University, Medford, MA
| | | | - Nadia Abuelezam
- Boston College William F. Connell School of Nursing, Chestnut Hill, Ma, USA
| | - Natalie Eckert
- Department of Community Health, Tufts University, Medford, MA
| | - Shervin Assari
- Department of Family Medicine, Charles R Drew University of Medicine and Science, Los Angeles, CA
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Moslem A, Rad A, de Prado Bert P, Alahabadi A, Ebrahimi Aval H, Miri M, Gholizadeh A, Ehrampoush MH, Sunyer J, Nawrot TS, Miri M, Dadvand P. Association of exposure to air pollution and telomere length in preschool children. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137933. [PMID: 32213432 DOI: 10.1016/j.scitotenv.2020.137933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 02/28/2020] [Accepted: 03/13/2020] [Indexed: 06/10/2023]
Abstract
Exposure to air pollution is associated with adverse health effects; however, the available evidence of its association with telomere length (TL), an early marker of ageing, in children is still scarce with no study available for preschool children. This study aimed to investigate the association of exposure to air pollution and traffic indicators at home and kindergarten with relative leukocyte TL (LTL) in preschool children. This cross-sectional study included 200 preschool children (5-7 years old) recruited from 27 kindergartens in Sabzevar, Iran (2017). Outdoor annual average levels PM1, PM2.5, and PM10 at residential address and kindergartens were estimated applying land use regression (LUR) models. Moreover, indoor levels of PMs at kindergartens were measured for four days in each season resulting in a total of 16 days of measurements for each kindergarten. Total streets length in different buffers and distance to major road were calculated as traffic indicators at residential address and kindergartens. We applied quantitative real-time polymerase chain reaction (qRT-PCR) to measure relative LTL in blood samples obtained from children. Mixed linear regression models were developed with qPCR plate and kindergarten as random effects, to estimate association of each pollutant and traffic indicator with LTL, controlled for relevant covariates. Higher concentrations of outdoor PM1, PM2.5, and PM10, at home and kindergartens were associated with shorter relative LTL. Similarly, increase in indoor PM2.5 concentrations at kindergartens was associated with shorter relative LTL (β = -0.18, 95% CI: -0.36, -0.01, P-value < 0.01). Moreover, higher total street length in 100 m buffer around residence and lower residential distance to major roads were associated with shorter relative LTL (β = -0.25, 95% CI: -0.37, -0.13, P-value < 0.01, and 0.32, 95% CI: 0.20, 0.44, P-value < 0.01, respectively). Overall, our study suggested that higher exposure to air pollution and traffic at kindergarten and residential home were associated with shorter relative LTL in preschool children.
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Affiliation(s)
- Alireza Moslem
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Abolfazl Rad
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Paula de Prado Bert
- ISGlobal, Barcelona, Spain; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Ahmad Alahabadi
- Non-communicable diseases Research Center, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Hamideh Ebrahimi Aval
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Masoumeh Miri
- Student Research Committee, Department of Biostatistics, School of Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Abdolmajid Gholizadeh
- Department of Environmental Health, School of Public Health, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Mohammad Hassan Ehrampoush
- Department of Environmental Health, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Jordi Sunyer
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Tim S Nawrot
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium; Department of Public Health & Primary Care, Leuven University, Leuven, Belgium
| | - Mohammad Miri
- Non-communicable diseases Research Center, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran.
| | - Payam Dadvand
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran; Pompeu Fabra University, Barcelona, Catalonia, Spain; Ciber on Epidemiology and Public Health (CIBERESP), Madrid, Spain.
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Prenatal second-hand smoke exposure and newborn telomere length. Pediatr Res 2020; 87:1081-1085. [PMID: 31578036 DOI: 10.1038/s41390-019-0594-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 08/29/2019] [Accepted: 09/09/2019] [Indexed: 11/08/2022]
Abstract
BACKGROUND Cigarette smoking is associated with shorter telomere lengths in adults, but evidence on the effect of prenatal tobacco exposure is limited. We aimed to investigate the association between prenatal second-hand smoke exposure and newborn telomere length. METHODS We recruited 762 mother-newborn pairs from Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital) between November 2013 and March 2015. Information on second-hand smoke exposure was obtained via questionnaires. Relative telomere length was measured in DNA extracted from umbilical cord blood. We used linear regression to assess the associations between prenatal second-hand smoke exposure and newborn telomere length. RESULTS In the fully adjusted model, prenatal second-hand smoke exposure was associated with 9.7% shorter newborn telomere length (percent difference: -9.7%; 95% confidence interval (CI): -15.0, -4.0). The estimate for boys was lower (percent difference: -10.9%; 95% CI: -18.6, -2.5) than that for girls (percent difference: -8.5%; 95% CI: -15.8, -0.5), but the interaction term between newborn sex and prenatal second-hand smoke was not significant (P = 0.751). CONCLUSIONS This study demonstrated that prenatal second-hand smoke exposure may be a preventable risk factor for accelerated biological aging in the intrauterine stage, and further suggested possible sex differences in the susceptibility to prenatal second-hand smoke.
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Osorio-Yáñez C, Clemente DBP, Maitre L, Vives-Usano M, Bustamante M, Martinez D, Casas M, Alexander J, Thomsen C, Chatzi L, Gützkow KB, Grazuleviciene R, Martens DS, Plusquin M, Slama R, McEachan RC, Wright J, Yang TC, Urquiza J, Tamayo I, Sunyer J, Vafeiadi M, Nawrot TS, Vrijheid M. Early life tobacco exposure and children's telomere length: The HELIX project. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 711:135028. [PMID: 32000334 DOI: 10.1016/j.scitotenv.2019.135028] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 10/14/2019] [Accepted: 10/16/2019] [Indexed: 06/10/2023]
Abstract
Telomere length and mitochondrial DNA content are considered biomarkers of cellular aging, oxidative stress, and inflammation, but there is almost no information on their association with tobacco smoke exposure in fetal and early life. The aim of this study was to assess whether prenatal and childhood tobacco exposure were associated with leukocyte telomere length (LTL) and mitochondrial DNA (mtDNA) content in children. As part of a multi-centre European birth cohort study HELIX (Human Early-Life Exposome) (n = 1396) we assessed maternal smoking status during pregnancy through questionnaires, and through urinary cotinine levels that were then used to classify women as not exposed to smoking (<10 µg/L), exposed to secondhand smoke (SHS) (10-50 µg/L) and active smokers (>50 µg/L). When the children were around 8 years of age (range: 5.4-12.0 years), childhood SHS tobacco smoke exposure was assessed through an extensive questionnaire and through measurements of urinary cotinine (<3.03 µg/L non-detected, >3.03 µg/L detected). Leukocyte mtDNA content and LTL were measured in the children at 8 years employing real time polymerase chain reaction (qPCR). Effect estimates were calculated using multivariate linear regression models for prenatal and childhood exposures adjusted for potential confounders. Maternal cotinine levels indicative of SHS exposure during pregnancy were associated with a decrease of 3.90% in LTL in children (95% CI: -6.68, -0.91), compared with non-smoking, whereas the association for maternal cotinine levels indicative of active smoking did not reach statistical significance (-3.24%; 95% CI: -6.59, 0.21). Childhood SHS tobacco exposure was not associated with LTL in children. Global SHS exposure during childhood was associated with an increase of 3.51% (95% CI: 0.78, 6.27) in mtDNA content. Our findings suggest that tobacco smoke exposure during pregnancy, even at SHS levels, may accelerate telomere shortening in children and thus induce biological aging from an early age.
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Affiliation(s)
- Citlalli Osorio-Yáñez
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México (UNAM), México DF, Mexico
| | - Diana B P Clemente
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain; Center for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Lea Maitre
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | - Martha Vives-Usano
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | - Mariona Bustamante
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | - David Martinez
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | - Maribel Casas
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | | | | | - Leda Chatzi
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA; Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands
| | | | | | - Dries S Martens
- Center for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Michelle Plusquin
- Center for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Remy Slama
- Team of Environmental Epidemiology, IAB, Institute for Advanced Biosciences, Inserm, CNRS, CHU-Grenoble-Alpes, University Grenoble-Alpes, CNRS, Grenoble, France
| | - Rosemary C McEachan
- Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
| | - John Wright
- Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
| | - Tiffany C Yang
- Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
| | - Jose Urquiza
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain
| | - Ibon Tamayo
- ISGlobal, Institute for Global Health, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain; Department of Statistics, Faculty of Arts and Sciences, Harvard University, Cambridge, MA, USA
| | - Jordi Sunyer
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain; Municipal Institute of Medical Research (IMIM-Hospital del Mar), Barcelona, Spain
| | - Marina Vafeiadi
- Department of Social Medicine, Faculty of Medicine, University of Crete, Heraklion, Greece
| | - Tim S Nawrot
- Center for Environmental Sciences, Hasselt University, Hasselt, Belgium; Department of Public Health & Primary Care, Unit Environment & Health, Leuven University, Leuven, Belgium
| | - Martine Vrijheid
- ISGlobal, Institute for Global Health, Barcelona, Spain; Univeristat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Spain.
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10
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Beijers R, Hartman S, Shalev I, Hastings W, Mattern BC, de Weerth C, Belsky J. Testing three hypotheses about effects of sensitive-insensitive parenting on telomeres. Dev Psychol 2020; 56:237-250. [PMID: 31961192 PMCID: PMC7391860 DOI: 10.1037/dev0000879] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Telomeres are the protective DNA-protein sequences appearing at the ends of chromosomes; they shorten with each cell division and are considered a biomarker of aging. Shorter telomere length and greater erosion have been associated with compromised physical and mental health and are hypothesized to be affected by early life stress. In the latter case, most work has relied on retrospective measures of early life stressors. The Dutch research (n = 193) presented herein tested 3 hypotheses prospectively regarding effects of sensitive-insensitive parenting during the first 2.5 years on telomere length at age 6, when first measured, and change over the following 4 years. It was predicted that (1) less sensitive parenting would predict shorter telomeres and greater erosion and that such effects would be most pronounced in children (2) exposed to prenatal stress and/or (3) who were highly negatively emotional as infants. Results revealed, only, that prenatal stress amplified parenting effects on telomere change-in a differential-susceptibility-related manner: Prenatally stressed children displayed more erosion when they experienced insensitive parenting and less erosion when they experienced sensitive parenting. Mechanisms that might initiate greater postnatal plasticity as a result of prenatal stress are highlighted and future work outlined. (PsycINFO Database Record (c) 2020 APA, all rights reserved).
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Affiliation(s)
| | | | | | | | | | | | - Jay Belsky
- Department of Human Development and Family Studies
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11
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Arias-Sosa LA. Understanding the Role of Telomere Dynamics in Normal and Dysfunctional Human Reproduction. Reprod Sci 2018; 26:6-17. [DOI: 10.1177/1933719118804409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Luis Alejandro Arias-Sosa
- Universidad Pedagógica y Tecnológica de Colombia, School of Biological Science, Tunja, Boyacá, Colombia
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12
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Whiteman VE, Goswami A, Salihu HM. Telomere length and fetal programming: A review of recent scientific advances. Am J Reprod Immunol 2018; 77. [PMID: 28500672 DOI: 10.1111/aji.12661] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 02/08/2017] [Indexed: 02/06/2023] Open
Abstract
We sought to synthesize a comprehensive literature review comprising recent research linking fetal programming to fetal telomere length. We also explored the potential effects fetal telomere length shortening has on fetal phenotypes. Utilizing the PubMed database as our primary search engine, we retrieved and reviewed 165 articles of published research. The inclusion criteria limited the articles to those that appeared within the last ten years, were pertinent to humans, and without restriction to language of publication. Our results showed that socio-demographic factors like age, sex, genetic inheritance, and acquired disease impact telomere length. Further, we found several maternal characteristics to be associated with fetal telomere length shortening, and these include maternal chemical exposure (eg, tobacco smoke), maternal stress during pregnancy, maternal nutritional and sleeping disorders during pregnancy as well as maternal disease status. Due to paucity of data, our review could not synthesize evidence directly linking fetal phenotypes to telomere length shortening. Although the research summarized in this review shows some association between determinants of intrauterine programming and fetal telomere length, there is still significant work that needs to be done to delineate the direct relationship of telomere attrition with specific fetal phenotypes.
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Affiliation(s)
- Valerie E Whiteman
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, USF Morsani College of Medicine, Tampa, FL, USA
| | - Anjali Goswami
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, USF Morsani College of Medicine, Tampa, FL, USA
| | - Hamisu M Salihu
- Department of Family and Community Medicine, Baylor College of Medicine, Houston, TX, USA
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13
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Stout SA, Lin J, Hernandez N, Davis EP, Blackburn E, Carroll JE, Glynn LM. Validation of Minimally-Invasive Sample Collection Methods for Measurement of Telomere Length. Front Aging Neurosci 2017; 9:397. [PMID: 29270121 PMCID: PMC5723637 DOI: 10.3389/fnagi.2017.00397] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 11/17/2017] [Indexed: 12/17/2022] Open
Abstract
Objective: The discovery of telomere length (TL) as a biomarker of cellular aging and correlate of age-related disease has generated a new field of research in the biology of healthy aging. Although the most common method of sample collection for TL is venous blood draw, less-invasive DNA collection methods are becoming more widely used. However, how TL relates across tissues derived from these sample collection methods is poorly understood. The current study is the first to characterize the associations in TL across three sample collection methods: venous whole blood, finger prick dried blood spot and saliva. Methods: TL was measured in 24 healthy young adults using three modes of sample collection for each participant: venous whole blood, finger prick dried blood spot and saliva. Relative TL was measured using quantitative polymerase chain reaction. Results: TL in finger prick dried blood spots (DBS) washighly correlated with TL in whole blood (r = 0.84, p < 0.001). Salivary TL was also correlated with whole blood TL (r = 0.56, p = 0.005), but this association was not as strong as that of dried blood spot TL (Steiger’s Z = 2.12, p = 0.034). TL was longer in saliva than in whole blood or DBS (p’s < 0.001). Conclusions: These findings have important implications for future study design by supporting the validity of less-invasive methods that can be implemented with vulnerable populations or in the field. Further, these findings aid in interpreting the burgeoning area of biological aging research and may shed light on our understanding of inconsistencies in the empirical literature.
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Affiliation(s)
- Stephanie A Stout
- Department of Psychology, University of Denver, Denver, CO, United States
| | - Jue Lin
- Department of Biochemistry and Biophysics, School of Medicine, University of California, San Francisco, San Francisco, CA, United States
| | - Natalie Hernandez
- Department of Psychiatry and Human Behavior, University of California, Irvine, Irvine, CA, United States
| | - Elysia P Davis
- Department of Psychology, University of Denver, Denver, CO, United States.,Department of Psychiatry and Human Behavior, University of California, Irvine, Irvine, CA, United States
| | - Elizabeth Blackburn
- Department of Biochemistry and Biophysics, School of Medicine, University of California, San Francisco, San Francisco, CA, United States
| | - Judith E Carroll
- Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Laura M Glynn
- Department of Psychology, Chapman University, Orange, CA, United States
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14
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Lu L, Johnman C, McGlynn L, Mackay DF, Shiels PG, Pell JP. Association between exposure to second-hand smoke and telomere length: cross-sectional study of 1303 non-smokers. Int J Epidemiol 2017; 46:1978-1984. [DOI: 10.1093/ije/dyx212] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/12/2017] [Indexed: 12/11/2022] Open
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15
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Lin A, Arnold BF, Mertens AN, Lin J, Benjamin-Chung J, Ali S, Hubbard AE, Stewart CP, Shoab AK, Rahman MZ, Hossen MS, Mutsuddi P, Famida SL, Akther S, Rahman M, Unicomb L, Dhabhar FS, Fernald LCH, Colford JM, Luby SP. Effects of water, sanitation, handwashing, and nutritional interventions on telomere length among children in a cluster-randomized controlled trial in rural Bangladesh. eLife 2017; 6:29365. [PMID: 28980942 PMCID: PMC5675593 DOI: 10.7554/elife.29365] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 10/03/2017] [Indexed: 01/17/2023] Open
Abstract
Background: Shorter childhood telomere length (TL) and more rapid TL attrition are widely regarded as manifestations of stress. However, the potential effects of health interventions on child TL are unknown. We hypothesized that a water, sanitation, handwashing (WSH), and nutritional intervention would slow TL attrition during the first two years of life. Methods: In a trial in rural Bangladesh, we randomized geographical clusters of pregnant women into individual water treatment, sanitation, handwashing, nutrition, combined WSH, combined nutrition plus WSH (N + WSH), or control arms. We conducted a substudy enrolling children from the control arm and the N + WSH intervention arm. Participants and outcome assessors were not masked; analyses were masked. Relative TL was measured at 1 and 2 years after intervention, and the change in relative TL was reported. Analysis was intention-to-treat. Results: Between May 2012 and July 2013, in the overall trial, we randomized 720 geographical clusters of 5551 pregnant women to a control or an intervention arm. In this substudy, after 1 year of intervention, we assessed a total of 662 children (341 intervention and 321 control) and 713 children after 2 years of intervention (383 intervention and 330 control). Children in the intervention arm had significantly shorter relative TL compared with controls after 1 year of intervention (difference −163 base pairs (bp), p=0.001). Between years 1 and 2, TL increased in the intervention arm (+76 bp) and decreased in the controls (−23 bp) (p=0.050). After 2 years, there was no difference between the arms (p=0.305). Conclusions: Our unexpected finding of increased telomere attrition during the first year of life in the intervention group suggests that rapid telomere attrition during this critical period could reflect the improved growth in the intervention group, rather than accumulated stress. Funding: Funded by The Bill and Melinda Gates Foundation. Clinical trial number: NCT01590095. Stress negatively affects health by causing changes in cells. As a result, excess stress may predispose people to fall ill more often or age faster. It is difficult to measure stress. Some studies suggest that measuring the ends of chromosomes, known as telomeres, may be one way to measure stress. Like the plastic tips on shoelaces, telomeres protect chromosomes from fraying. All peoples’ telomeres shorten over their lifetime with each cell division. Many studies show that telomeres shorten faster in people who experience more stress. When telomeres become too short, cells die faster without being replaced, and the body ages. Most studies on telomere length have looked at adults. Few studies have looked at children early in life or asked whether there are ways to intervene to stop or reverse stress-related telomere shortening. The first two years of life are a crucial period for the developing brain and immune system, which could set children on a lifelong course toward health or disease. Young children living in low-resource settings often encounter many sources of stress, like poor nutrition, infectious diseases or violence. Studies are needed to determine if interventions in early childhood aimed at reducing some sources of stress improve telomere length or long-term health. Now, Lin et al. show that interventions to provide safe water, sanitation, handwashing facilities, and better nutrition to children in rural Bangladesh unexpectedly shortened telomeres. As part of a larger study, pregnant women in rural Bangladesh were divided, at random, into groups. One group received a suite of interventions, which included more sanitary toilets, handwashing facilities, and nutritional supplements for their infants. Another group served as a control and did not receive this extra help. Lin et al. looked at telomere length, growth, and infections in a subset of 713 children whose mothers participated in the study. Children who got the extra help grew faster and were less likely to get diarrhea or parasitic infections than the children in the control group. Unexpectedly, children in the intervention group had shorter telomeres at 14 months of age than the children in the control group. Lin et al. suggest that the telomere shortening in the intervention group might be a consequence of rapid growth and immune system development in the first year of life rather than resulting from biological stress. More studies are needed to ask whether telomere shortening is indeed linked to faster growth and development early in life. The strong and unexpected findings highlight how little is known about how the length of telomeres can be used to predict future health or disease. Interpreting the length of telomeres over a person’s lifetime could prove more nuanced than originally thought.
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Affiliation(s)
- Audrie Lin
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Benjamin F Arnold
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Andrew N Mertens
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Jue Lin
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, United States
| | - Jade Benjamin-Chung
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Shahjahan Ali
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Alan E Hubbard
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Christine P Stewart
- Department of Nutrition, University of California, Davis, Davis, United States
| | - Abul K Shoab
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Md Ziaur Rahman
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Md Saheen Hossen
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Palash Mutsuddi
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Syeda L Famida
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Salma Akther
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Mahbubur Rahman
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Leanne Unicomb
- Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Firdaus S Dhabhar
- Sylvester Comprehensive Cancer Center, Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, United States
| | - Lia C H Fernald
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - John M Colford
- School of Public Health, University of California, Berkeley, Berkeley, United States
| | - Stephen P Luby
- Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, United States
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16
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Mirzakhani H, De Vivo I, Leeder JS, Gaedigk R, Vyhlidal CA, Weiss ST, Tantisira K. Early pregnancy intrauterine fetal exposure to maternal smoking and impact on fetal telomere length. Eur J Obstet Gynecol Reprod Biol 2017; 218:27-32. [PMID: 28926727 DOI: 10.1016/j.ejogrb.2017.09.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/19/2017] [Accepted: 09/13/2017] [Indexed: 11/18/2022]
Abstract
BACKGROUND Reduced telomere length, or its accelerated attrition, has been implicated in aging, mortality, and several human diseases, including respiratory diseases. Age dependent manifestation of telomere-mediated disease during life span indicates the role of developmental stage in these diseases and highlights the importance of fetal developmental process in utero and at earlier life stages. Environmental determinants during developmental and later stages of life could affect telomere length. Smoke exposure as one of these significant determinants have been investigated in association with telomere length in neonates at time of delivery, children and adults. OBJECTIVE We sought to investigate whether intrauterine fetal exposure to tobacco smoking characterized by placenta cotinine levels during early weeks of pregnancy might be associated with shorter relative telomere length (T/S ratio) as compared to fetuses without exposure to tobacco smoking. STUDY DESIGN 207 Human placenta and epithelial lung samples were used for both fetal lung telomere length assessment and measurement of placental cotinine levels. Tissues were obtained from two NICHD-supported tissue retrieval programs with registries for elective abortions, the University of Washington Center for Birth Defects Research (Seattle, WA) and the University of Maryland Brain and Tissue Bank for Developmental Disorders (Baltimore, MD). Cotinine levels (ng/g total placental tissue) were determined in whole cell extracts prepared from human placenta samples to characterize and confirm the cotinine exposure status associated with maternal smoking. Relative telomere length (T/S ratio) in genomic DNA extracted from fetal lung tissue was measured by use of quantitative real-time polymerase chain reaction. Multivariable linear regression was used to investigate the relationship between fetal Telomere-to-Single Copy (T/S) ratio and tobacco exposure. RESULTS The estimated post-conception ages for included samples in the study ranged from 54 to 137days (7-19 weeks of gestation); 47.37% of fetal samples had female sex. Of the samples included in the analysis 96 and 111 fetal samples with and without intrauterine tobacco smoking exposure were distinguished. While T/S ratio was not different between those with and without smoking exposure (1.24±0.41 and 1.27±0.48, respectively; P=0.70), a significant effect modification of post-conception age on the relationship of intrauterine smoke exposure on fetal T/S ratio was observed (adjusted coefficient=-0.008, 95% CI: -0.016, -0.0004). The smoke exposure status was associated with T/S ratio after 93-day post conception (adjusted coefficient=-0.29, 95% CI: -0.53, -0.052). CONCLUSIONS Our results demonstrate a significant association of smoke exposure in utero at early pregnancy with shortened fetal relative telomere length in the developing lung and suggest that the detrimental effect of smoking exposure on future disease sequelae may start at the early stages of pregnancy.
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Affiliation(s)
- Hooman Mirzakhani
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Immaculata De Vivo
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Epidemiology, T.H. Chan School of Public Health, Boston, MA, USA
| | - J Steven Leeder
- Division of Pharmacology, Toxicology and Experimental Therapeutics, Children's Mercy Kansas City, Kansas City, MO, USA
| | - Roger Gaedigk
- Division of Pharmacology, Toxicology and Experimental Therapeutics, Children's Mercy Kansas City, Kansas City, MO, USA
| | - Carrie A Vyhlidal
- Division of Pharmacology, Toxicology and Experimental Therapeutics, Children's Mercy Kansas City, Kansas City, MO, USA
| | - Scott T Weiss
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Kelan Tantisira
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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17
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Telomere-associated aging disorders. Ageing Res Rev 2017; 33:52-66. [PMID: 27215853 PMCID: PMC9926533 DOI: 10.1016/j.arr.2016.05.009] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/17/2016] [Accepted: 05/19/2016] [Indexed: 01/25/2023]
Abstract
Telomeres are dynamic nucleoprotein-DNA structures that cap and protect linear chromosome ends. Several monogenic inherited diseases that display features of human premature aging correlate with shortened telomeres, and are referred to collectively as telomeropathies. These disorders have overlapping symptoms and a common underlying mechanism of telomere dysfunction, but also exhibit variable symptoms and age of onset, suggesting they fall along a spectrum of disorders. Primary telomeropathies are caused by defects in the telomere maintenance machinery, whereas secondary telomeropathies have some overlapping symptoms with primary telomeropathies, but are generally caused by mutations in DNA repair proteins that contribute to telomere preservation. Here we review both the primary and secondary telomeropathies, discuss potential mechanisms for tissue specificity and age of onset, and highlight outstanding questions in the field and future directions toward elucidating disease etiology and developing therapeutic strategies.
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18
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Accelerated telomere shortening: Tracking the lasting impact of early institutional care at the cellular level. Psychiatry Res 2016; 246:95-100. [PMID: 27677058 PMCID: PMC5228335 DOI: 10.1016/j.psychres.2016.09.023] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/04/2016] [Accepted: 09/16/2016] [Indexed: 01/01/2023]
Abstract
Studies examining the association between early adversity and longitudinal changes in telomere length within the same individual are rare, yet are likely to provide novel insight into the subsequent lasting effects of negative early experiences. We sought to examine the association between institutional care history and telomere shortening longitudinally across middle childhood and into adolescence. Buccal DNA was collected 2-4 times, between the ages of 6 and 15 years, in 79 children enrolled in the Bucharest Early Intervention Project (BEIP), a longitudinal study exploring the impact of early institutional rearing on child health and development. Children with a history of early institutional care (n=50) demonstrated significantly greater telomere shortening across middle childhood and adolescence compared to never institutionalized children (n=29). Among children with a history of institutional care, randomization to high quality foster care was not associated with differential telomere attrition across development. Cross-sectional analysis of children randomized to the care as usual group indicated shorter telomere length was associated with greater percent of the child's life spent in institutional care up to age 8. These results suggest that early adverse care from severe psychosocial deprivation may be embedded at the molecular genetic level through accelerated telomere shortening.
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19
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Spagnolo P, Cottin V. Genetics of idiopathic pulmonary fibrosis: from mechanistic pathways to personalised medicine. J Med Genet 2016; 54:93-99. [DOI: 10.1136/jmedgenet-2016-103973] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 11/28/2016] [Indexed: 01/07/2023]
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20
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Lv Y, Zhang Y, Li X, Ren X, Wang M, Tian S, Hou P, Shi B, Yang Q. Long telomere length predicts poor clinical outcome in esophageal cancer patients. Pathol Res Pract 2016; 213:113-118. [PMID: 28027815 DOI: 10.1016/j.prp.2016.11.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 11/10/2016] [Accepted: 11/11/2016] [Indexed: 12/26/2022]
Abstract
BACKGROUND Abnormal telomere length is widely reported in various human cancers, and it is considered to be an important hallmark of cancer. However, there is remarkably little consensus on the value of telomere length in the prognostic evaluation of esophageal cancers. Here, we attempted to determine the association of variable telomere length with clinical outcome of esophageal cancer patients. MATERIALS AND METHODS Using real-time quantitative PCR, we examined relative telomere lengths (RTL) in a cohort of esophageal cancer and normal esophageal tissues, and statistically investigated the association between RTL and clinical outcomes of esophageal cancer patients. RESULTS The majority of esophageal cancers in this study had longer RTLs as compared to adjacent non-tumor tissues. Enhanced tumor RTL was associated with smoking habit, poor differentiation, advanced tumor stage, lymph node metastasis and cancer related death. In particular, a close relationship between longer RTL and poor survival was fully demonstrated by using cox regression and Kaplan-Maier survival curves. CONCLUSIONS We found frequent telomere elongation in esophageal cancer tissues, and demonstrated longer RTL may be an independent poor prognostic factor for esophageal cancer patients.
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Affiliation(s)
- Yanyan Lv
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China; Department of Rheumatology, Xi'an No. 5 Hospital, Xi'an 710082, People's Republic of China.
| | - Yong Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Xinru Li
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Xiaojuan Ren
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Meichen Wang
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Sijia Tian
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Peng Hou
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China; Key Laboratory for Tumor Precision Medicine of Shaanxi Province, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Bingyin Shi
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China; Key Laboratory for Tumor Precision Medicine of Shaanxi Province, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
| | - Qi Yang
- Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China; Key Laboratory for Tumor Precision Medicine of Shaanxi Province, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, People's Republic of China.
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21
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Walton RT, Mudway IS, Dundas I, Marlin N, Koh LC, Aitlhadj L, Vulliamy T, Jamaludin JB, Wood HE, Barratt BM, Beevers S, Dajnak D, Sheikh A, Kelly FJ, Griffiths CJ, Grigg J. Air pollution, ethnicity and telomere length in east London schoolchildren: An observational study. ENVIRONMENT INTERNATIONAL 2016; 96:41-47. [PMID: 27591803 DOI: 10.1016/j.envint.2016.08.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 08/24/2016] [Accepted: 08/24/2016] [Indexed: 05/03/2023]
Abstract
BACKGROUND Short telomeres are associated with chronic disease and early mortality. Recent studies in adults suggest an association between telomere length and exposure to particulate matter, and that ethnicity may modify the relationship. However associations in children are unknown. OBJECTIVES We examined associations between air pollution and telomere length in an ethnically diverse group of children exposed to high levels of traffic derived pollutants, particularly diesel exhaust, and to environmental tobacco smoke. METHODS Oral DNA from 333 children (8-9years) participating in a study on air quality and respiratory health in 23 inner city London schools was analysed for relative telomere length using monochrome multiplex qPCR. Annual, weekly and daily exposures to nitrogen oxides and particulate matter were obtained from urban dispersion models (2008-10) and tobacco smoke by urinary cotinine. Ethnicity was assessed by self-report and continental ancestry by analysis of 28 random genomic markers. We used linear mixed effects models to examine associations with telomere length. RESULTS Telomere length increased with increasing annual exposure to NOx (model coefficient 0.003, [0.001, 0.005], p<0.001), NO2 (0.009 [0.004, 0.015], p<0.001), PM2.5 (0.041, [0.020, 0.063], p<0.001) and PM10 (0.096, [0.044, 0.149], p<0.001). There was no association with environmental tobacco smoke. Telomere length was increased in children reporting black ethnicity (22% [95% CI 10%, 36%], p<0.001) CONCLUSIONS: Pollution exposure is associated with longer telomeres in children and genetic ancestry is an important determinant of telomere length. Further studies should investigate both short and long-term associations between pollutant exposure and telomeres in childhood and assess underlying mechanisms.
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Affiliation(s)
- Robert T Walton
- Asthma UK Centre for Applied Asthma Research, Centre for Primary Care and Public Health, Blizard Institute, Queen Mary University of London, London, United Kingdom.
| | - Ian S Mudway
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Isobel Dundas
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Nadine Marlin
- Asthma UK Centre for Applied Asthma Research, Centre for Primary Care and Public Health, Blizard Institute, Queen Mary University of London, London, United Kingdom
| | - Lee C Koh
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Layla Aitlhadj
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Tom Vulliamy
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Jeenath B Jamaludin
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Helen E Wood
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Ben M Barratt
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Sean Beevers
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - David Dajnak
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Aziz Sheikh
- Usher Institute of Population Health Sciences and Informatics, The University of Edinburgh, Medical School Doorway 3, Teviot Place, Edinburgh, United Kingdom
| | - Frank J Kelly
- MRC-PHE Centre for Environment and Health and NIHR HPRU in Health Impact of Environmental Hazards, King's College London, London, United Kingdom
| | - Chris J Griffiths
- Asthma UK Centre for Applied Asthma Research, Centre for Primary Care and Public Health, Blizard Institute, Queen Mary University of London, London, United Kingdom
| | - Jonathan Grigg
- Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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Wojcicki JM, Heyman MB, Elwan D, Lin J, Blackburn E, Epel E. Early exclusive breastfeeding is associated with longer telomeres in Latino preschool children. Am J Clin Nutr 2016; 104:397-405. [PMID: 27440083 PMCID: PMC4962153 DOI: 10.3945/ajcn.115.115428] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 06/09/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Telomere length (TL) is a marker of cellular aging, with the majority of lifetime attrition occurring during the first 4 y. Little is known about risk factors for telomere shortening in childhood. OBJECTIVE We evaluated the relation between early life feeding variables and preschool TL. DESIGN We assessed the relation between dietary, feeding, and weight-associated risk factors measured from birth and TL from blood samples taken at 4 y of age (n = 108) and 5 y of age (n = 92) in a cohort of urban, Latino children (n = 121 individual children). Feeding variables were evaluated in children with repeat measurements (n = 77). RESULTS Mean TL (in bp) was associated with exclusive breastfeeding at 4-6 wk of age (adjusted coefficient: 353.85; 95% CI: 72.81, 634.89; P = 0.01), maternal TL (adjusted coefficient: 0.32; 95% CI: 0.11, 0.54; P < 0.01), and older paternal age (adjusted coefficient: 33.27; 95% CI: 4.10, 62.44; P = 0.03). The introduction of other foods or drinks in addition to breast-milk or replacement-milk substitutes before 4-6 wk of age was associated with mean TL at 4 and 5 y of age (adjusted coefficient: -457.01; 95% CI: -720.50, -193.51; P < 0.01). Infant obesity at 6 mo of age and soda consumption at 4 y of age mediated the relation in part between exclusive breastfeeding at 4-6 wk of age and mean TL at 4 and 5 y of age. High soda consumption at 3 y of age was associated with an accelerated attrition from 4 to 5 y of age (adjusted coefficient: -515.14; 95% CI: -986.06, -41.22; P = 0.03). CONCLUSION Exclusive breastfeeding at 4-6 wk of age may have long-term effects on child health as evidenced by longer TL at 4 and 5 y of age.
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Affiliation(s)
| | | | | | - Jue Lin
- Biochemistry and Biophysics, and
| | | | - Elissa Epel
- Psychiatry, University of California, San Francisco, San Francisco, CA
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Pawlas N, Płachetka A, Kozłowska A, Mikołajczyk A, Kasperczyk A, Dobrakowski M, Kasperczyk S. Telomere length, telomerase expression, and oxidative stress in lead smelters. Toxicol Ind Health 2016; 32:1961-1970. [DOI: 10.1177/0748233715601758] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The negative health effects caused by lead (Pb) exposure are widely recognized; however, the molecular mechanisms remain unknown. The aim of this study was to assess the effect of occupational Pb exposure on telomere length and to investigate the potential mechanisms leading to telomere shortening. A cohort of 334 male Pb smelters (exposed group) and 60 age-adjusted males unexposed to Pb (control group) were examined. Assessments of relative telomere length (rTL) and telomerase reverse transcriptase (TERT) gene expression were performed using quantitative real-time polymerase chain reactions. Assessments of whole blood Pb (B-Pb) and whole blood cadmium (B-Cd) concentrations and serum selenium concentration (S-Se) were performed using graphite furnace atomic absorption spectrometry. We analyzed total oxidation status (TOS), lipid hydroperoxides (LHPs), malonylodialdehyde levels in serum (MDA) and in erythrocyte hemolysates (MDA-hgb), and 8-hydroxy-deoxy-guanosine (8-OHdG). The Pb-exposed group had higher B-Pb values and shorter rTL than the control group. The arithmetic mean values calculated for B-Pb were 33 µg/dL versus 2.2 µg/dL ( p < 0.0001), and the rTL values were 0.928 and 1.126 relative units ( p = 0.001), respectively, for the Pb-exposed and control groups. The rTL was found to gradually shorten in response to the increasing levels of Pb exposure. The Pb-exposed group also demonstrated a higher level of oxidative stress than the control group, which was indicated by increased TOS and MDA-hgb values. rTL was negatively associated with parameters that indicated increased oxidative stress, including TOS (Spearman’s rank coefficient ( rS) = −0.16; p < 0.01) and MDA-hgb ( rS = −0.17; p < 0.001). No correlations were found between rTL and B-Cd and S-Se or smoking and MDA and LHP levels. Univariate analysis indicated that B-Pb was associated with decreased rTL ( β =−0.0041; p = 0.0063) and that the association between B-Pb and rTL remained significant, even when adjusting for age ( β = −0.0041; p = 0.0065) and in multivariable-adjusted model ( β = −0.0042; p = 0.0063). In conclusion, occupational Pb exposure resulted in decreased rTL and may represent a mechanism that contributes to Pb-related diseases.
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Affiliation(s)
- Natalia Pawlas
- Institute of Occupational Medicine and Environmental Health, Sosnowiec, Poland
| | - Anna Płachetka
- Department of Animal Physiology and Ecotoxicology, University of Silesia, Katowice, Poland
| | - Agnieszka Kozłowska
- Institute of Occupational Medicine and Environmental Health, Sosnowiec, Poland
| | | | - Aleksandra Kasperczyk
- Department of Biochemistry, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
| | - Michał Dobrakowski
- Department of Biochemistry, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
| | - Sławomir Kasperczyk
- Department of Biochemistry, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
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Ahrens KA, Rossen LM, Simon AE. Relationship Between Mean Leucocyte Telomere Length and Measures of Allostatic Load in US Reproductive-Aged Women, NHANES 1999-2002. Paediatr Perinat Epidemiol 2016; 30:325-35. [PMID: 26854139 PMCID: PMC6697084 DOI: 10.1111/ppe.12277] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Reproductive health disparities may be partly explained by the cumulative effects of chronic stress experienced by socially disadvantaged groups. Although, telomere length (TL) and allostatic load score have each been used as biological markers of stress, the relationship between these two measures is unknown. METHODS We investigated the association between leucocyte TL and allostatic load score in 1503 non-pregnant women (20-44 years) participating in the National Health and Nutrition Examination Survey, 1999-2002. We constructed six different allostatic load scores using either quartile- or clinical-based cut-points for 14 biomarkers based on previously published methods. We estimated associations between TL and allostatic load scores and component biomarkers using linear regression, also assessing interactions by race/ethnicity. RESULTS After adjustment for age, longer TL was associated with higher HDL cholesterol and lower C-reactive protein and creatinine clearance; TL was not associated with the other component biomarkers. Shorter TL was associated with higher allostatic load scores for the two clinical cut-point-based scores after adjustment for age, but not the four scores based on quartile cut-points. Significant interactions by race/ethnicity were observed for TL and HbA1c and triglycerides, but not for other component biomarkers or allostatic load scores. CONCLUSIONS Although TL and allostatic load score are both considered measures of cumulative stress, most component biomarkers and scores using quartile-based cut-points were not associated with TL. In reproductive-aged women, allostatic load scores using clinical-based cut-points were more strongly associated with TL compared with quartile-based scores.
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Affiliation(s)
- Katherine A. Ahrens
- National Center for Health Statistics; Centers for Disease Control and Prevention; Office of Analysis & Epidemiology; Infant, Child & Women's Health Statistics Branch; Hyattsville MD
| | - Lauren M. Rossen
- National Center for Health Statistics; Centers for Disease Control and Prevention; Office of Analysis & Epidemiology; Infant, Child & Women's Health Statistics Branch; Hyattsville MD
| | - Alan E. Simon
- National Center for Health Statistics; Centers for Disease Control and Prevention; Office of Analysis & Epidemiology; Infant, Child & Women's Health Statistics Branch; Hyattsville MD
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25
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Ip P, Chung BHY, Ho FKW, Chan GCF, Deng W, Wong WHS, Lee SL, Chan PYT, Ying D, Wong WL, Tung KTS, Lau YL. Prenatal Tobacco Exposure Shortens Telomere Length in Children. Nicotine Tob Res 2016; 19:111-118. [DOI: 10.1093/ntr/ntw139] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 05/04/2016] [Indexed: 12/17/2022]
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26
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Yabuta S, Masaki M, Shidoji Y. Associations of Buccal Cell Telomere Length with Daily Intake of β-Carotene or α-Tocopherol Are Dependent on Carotenoid Metabolism-related Gene Polymorphisms in Healthy Japanese Adults. J Nutr Health Aging 2016; 20:267-74. [PMID: 26892575 DOI: 10.1007/s12603-015-0577-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Telomere length shortening is modulated not only by aging, but also by both genetic and environmental factors. The aim of this study was to investigate the interactions between antioxidant nutrient metabolism-related gene single nucleotide polymorphisms (the genetic factors) and nutrient intake (the environmental factors) in their effects on telomere length shortening. SETTING AND PARTICIPANTS Data were collected on the relative telomere lengths (RTLs) of buccal cells and the habitual food intake of 70 healthy Japanese adults. MEASUREMENTS All subjects were genotyped for two common single nucleotide polymorphisms: rs6564851 in the β-carotene-15,15'-mono-oxygenase 1 (BCMO1) gene and rs362090 in the intestine-specific homeobox (ISX) gene. RESULTS Univariate analysis revealed that buccal RTL was not significantly modulated by either age or gender. Then, we subdivided the study population into four groups based on combinations of the rs6564851 and rs362090 genotypes. After this subdivision, we showed a positive effect of daily α- or β-carotene intake on buccal RTL in the ISX rs362090 G-allele carrier + BCMO1 rs6564851 GG-genotype group (p = 0.026). Additionally, daily intake of another antioxidative fat-soluble vitamin, α-tocopherol, was positively associated with buccal RTL in the ISX rs362090 AA-homozygote + BCMO1 rs6564851 T-allele carrier group (p = 0.037). CONCLUSION Our study clearly indicates that high dietary intake of the antioxidants α, β-carotene and α-tocopherol protects buccal cells from RTL shortening, depending on the genetic background of antioxidant vitamin-related genes.
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Affiliation(s)
- S Yabuta
- Yoshihiro Shidoji, Molecular and Cellular Biology, Graduate School of Human Health Science, University of Nagasaki, 1-1-1 Academy Hills, Nagayo, Nagasaki 851-2195, Japan. E-mail:
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27
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Pawlas N, Płachetka A, Kozłowska A, Broberg K, Kasperczyk S. Telomere length in children environmentally exposed to low-to-moderate levels of lead. Toxicol Appl Pharmacol 2015; 287:111-118. [DOI: 10.1016/j.taap.2015.05.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Revised: 05/04/2015] [Accepted: 05/06/2015] [Indexed: 01/12/2023]
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28
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Ford JD. Complex PTSD: research directions for nosology/assessment, treatment, and public health. Eur J Psychotraumatol 2015; 6:27584. [PMID: 25994023 PMCID: PMC4439420 DOI: 10.3402/ejpt.v6.27584] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 04/09/2015] [Accepted: 04/09/2015] [Indexed: 12/03/2022] Open
Abstract
Complex posttraumatic stress disorder (CPTSD) in children and adolescents extends beyond the core PTSD symptoms to dysregulation in three psychobiological domains: (1) emotion processing, (2) self-organization (including bodily integrity), and (3) relational functioning. CPTSD research directions for the next decade and beyond are identified in three areas: (1) diagnostic classification (establishing the empirical integrity of CPTSD as a distinct form of psychopathology) and psychometric assessment [validation and refinement of measures of childhood polyvictimization and developmental trauma disorder (DTD)], (2) rigorous evaluation and refinement of interventions (and algorithms for their delivery) developed or adapted for CPTSD and DTD, and (3) the epidemiology of CPTSD and DTD, and their public health and safety impact, across the lifespan and intergenerationally, for populations, nations, and cultures.
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Affiliation(s)
- Julian D Ford
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, CT, USA;
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29
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Cogan JD, Kropski JA, Zhao M, Mitchell DB, Rives L, Markin C, Garnett ET, Montgomery KH, Mason WR, McKean DF, Powers J, Murphy E, Olson LM, Choi L, Cheng DS, Blue EM, Young LR, Lancaster LH, Steele MP, Brown KK, Schwarz MI, Fingerlin TE, Schwartz DA, Lawson WE, Loyd JE, Zhao Z, Phillips JA, Blackwell TS. Rare variants in RTEL1 are associated with familial interstitial pneumonia. Am J Respir Crit Care Med 2015; 191:646-55. [PMID: 25607374 DOI: 10.1164/rccm.201408-1510oc] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
RATIONALE Up to 20% of cases of idiopathic interstitial pneumonia cluster in families, comprising the syndrome of familial interstitial pneumonia (FIP); however, the genetic basis of FIP remains uncertain in most families. OBJECTIVES To determine if new disease-causing rare genetic variants could be identified using whole-exome sequencing of affected members from FIP families, providing additional insights into disease pathogenesis. METHODS Affected subjects from 25 kindreds were selected from an ongoing FIP registry for whole-exome sequencing from genomic DNA. Candidate rare variants were confirmed by Sanger sequencing, and cosegregation analysis was performed in families, followed by additional sequencing of affected individuals from another 163 kindreds. MEASUREMENTS AND MAIN RESULTS We identified a potentially damaging rare variant in the gene encoding for regulator of telomere elongation helicase 1 (RTEL1) that segregated with disease and was associated with very short telomeres in peripheral blood mononuclear cells in 1 of 25 families in our original whole-exome sequencing cohort. Evaluation of affected individuals in 163 additional kindreds revealed another eight families (4.7%) with heterozygous rare variants in RTEL1 that segregated with clinical FIP. Probands and unaffected carriers of these rare variants had short telomeres (<10% for age) in peripheral blood mononuclear cells and increased T-circle formation, suggesting impaired RTEL1 function. CONCLUSIONS Rare loss-of-function variants in RTEL1 represent a newly defined genetic predisposition for FIP, supporting the importance of telomere-related pathways in pulmonary fibrosis.
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Affiliation(s)
- Joy D Cogan
- 1 Division of Medical Genetics and Genomic Medicine, Department of Pediatrics
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Brett ZH, Humphreys KL, Fleming AS, Kraemer GW, Drury SS. Using cross-species comparisons and a neurobiological framework to understand early social deprivation effects on behavioral development. Dev Psychopathol 2015; 27:347-67. [PMID: 25997759 PMCID: PMC5299387 DOI: 10.1017/s0954579415000036] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Building upon the transactional model of brain development, we explore the impact of early maternal deprivation on neural development and plasticity in three neural systems: hyperactivity/impulsivity, executive function, and hypothalamic-pituitary-adrenal axis functioning across rodent, nonhuman primate, and human studies. Recognizing the complexity of early maternal-infant interactions, we limit our cross-species comparisons to data from rodent models of artificial rearing, nonhuman primate studies of peer rearing, and the relations between these two experimental approaches and human studies of children exposed to the early severe psychosocial deprivation associated with institutional care. In addition to discussing the strengths and limitations of these paradigms, we present the current state of research on the neurobiological impact of early maternal deprivation and the evidence of sensitive periods, noting methodological challenges. Integrating data across preclinical animal models and human studies, we speculate about the underlying biological mechanisms; the differential impact of deprivation due to temporal factors including onset, offset, and duration of the exposure; and the possibility and consequences of reopening of sensitive periods during adolescence.
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31
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Kropski JA, Blackwell TS, Loyd JE. The genetic basis of idiopathic pulmonary fibrosis. Eur Respir J 2015; 45:1717-27. [PMID: 25837031 DOI: 10.1183/09031936.00163814] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 03/17/2015] [Indexed: 02/06/2023]
Abstract
Throughout the past decade, there have been substantial advances in understanding the pathogenesis of idiopathic pulmonary fibrosis (IPF). Recently, several large genome-wide association and linkage studies have identified common genetic variants in more than a dozen loci that appear to contribute to IPF risk. In addition, family-based studies have led to the identification of rare genetic variants in genes related to surfactant function and telomere biology, and mechanistic studies suggest pathophysiological derangements associated with these rare genetic variants are also found in sporadic cases of IPF. Current evidence suggests that rather than existing as distinct syndromes, sporadic and familial cases of IPF (familial interstitial pneumonia) probably reflect a continuum of genetic risk. Rapidly evolving bioinformatic and molecular biology techniques, combined with next-generation sequencing technologies, hold great promise for developing a comprehensive, integrated approach to defining the fundamental molecular mechanisms that underlie IPF pathogenesis.
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Affiliation(s)
- Jonathan A Kropski
- Division of Allergy, Pulmonary and Critical Care Medicine, Dept of Medicine, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Timothy S Blackwell
- Division of Allergy, Pulmonary and Critical Care Medicine, Dept of Medicine, Vanderbilt University School of Medicine, Nashville, TN, USA Dept of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA Dept of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN, USA Department of Veterans Affairs Medical Center, Nashville, TN, USA
| | - James E Loyd
- Division of Allergy, Pulmonary and Critical Care Medicine, Dept of Medicine, Vanderbilt University School of Medicine, Nashville, TN, USA
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Wren ME, Shirtcliff EA, Drury SS. Not all biofluids are created equal: chewing over salivary diagnostics and the epigenome. Clin Ther 2015; 37:529-39. [PMID: 25778408 DOI: 10.1016/j.clinthera.2015.02.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 02/12/2015] [Accepted: 02/13/2015] [Indexed: 02/08/2023]
Abstract
PURPOSE This article describes progress to date in the characterization of the salivary epigenome and considers the importance of previous work in the salivary microbiome, proteome, endocrine analytes, genome, and transcriptome. METHODS PubMed and Web of Science were used to extensively search the existing literature (original research and reviews) related to salivary diagnostics and biomarker development, of which 125 studies were examined. This article was derived from the most relevant 74 sources highlighting the recent state of the evolving field of salivary epigenomics and contributing significantly to the foundational work in saliva-based research. FINDINGS Validation of any new saliva-based diagnostic or analyte will require comparison to previously accepted standards established in blood. Careful attention to the collection, processing, and analysis of salivary analytes is critical for the development and implementation of newer applications that include genomic, transcriptomic, and epigenomic markers. All these factors must be integrated into initial study design. IMPLICATIONS This commentary highlights the appeal of the salivary epigenome for translational applications and its utility in future studies of development and the interface among environment, disease, and health.
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Affiliation(s)
- Michael E Wren
- Neuroscience Graduate Program, Tulane University, New Orleans, Louisiana; Department of Psychiatry and Behavioral Science, Tulane University School of Medicine, New Orleans, Louisiana
| | | | - Stacy S Drury
- Neuroscience Graduate Program, Tulane University, New Orleans, Louisiana; Department of Psychiatry and Behavioral Science, Tulane University School of Medicine, New Orleans, Louisiana.
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Salihu HM, Pradhan A, King L, Paothong A, Nwoga C, Marty PJ, Whiteman V. Impact of intrauterine tobacco exposure on fetal telomere length. Am J Obstet Gynecol 2015; 212:205.e1-8. [PMID: 25173189 DOI: 10.1016/j.ajog.2014.08.026] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 08/12/2014] [Accepted: 08/25/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVE We sought to investigate whether maternal smoking during pregnancy affects telomere length of the fetus. STUDY DESIGN Pregnant women were recruited on hospital admission at delivery. A self-report questionnaire and salivary cotinine test were used to confirm tobacco exposure. Neonatal umbilical cord blood samples were collected, and genomic DNA was isolated from cord blood leukocytes and was analyzed for fetal telomere length based on quantitative polymerase chain reaction. A ratio of relative telomere length was determined by telomere repeat copy number and single copy gene copy number (T/S ratio) and used to compare the telomere length of active, passive, and nonsmokers. Bootstrap and analysis of variance statistical methods were used to evaluate the relationship between prenatal smoking status and fetal telomere length. RESULTS Of the 86 women who were included in this study, approximately 69.8% of the participants were covered by Medicaid, and 55.8% of the participants were black or Hispanic. The overall mean T/S ratio was 0.8608 ± 1.0442. We noted an inverse relationship between smoking and fetal telomere length in a dose-response pattern (T/S ratio of nonsmokers that was more than passive smokers that was more than active smokers). Telomere length was significantly different for each pairwise comparison, and the greatest difference was between active and nonsmokers. CONCLUSION Our results provide the first evidence to demonstrate a positive association between shortened fetal telomere length and smoking during pregnancy. Our findings suggest the possibility of early intrauterine programming for accelerated aging that is the result of tobacco exposure.
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Chen X, Velez JC, Barbosa C, Pepper M, Andrade A, Stoner L, De Vivo I, Gelaye B, Williams MA. Smoking and perceived stress in relation to short salivary telomere length among caregivers of children with disabilities. Stress 2015; 18:20-8. [PMID: 25256607 PMCID: PMC4344384 DOI: 10.3109/10253890.2014.969704] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Telomere length (TL), the length of repeated DNA sequence that forms protective caps at the end of chromosomes, has emerged as a novel biomarker of cell aging and oxidative stress. There is increasing research exploring the associations of smoking and perceived stress with TL, and the results are inconsistent. This study aimed to examine whether smoking and perceived stress were associated with shortened salivary TL among primary caregivers of children with disabilities. Using a quantitative polymerase chain reaction method, salivary TL was assessed among 89 caregivers aged 19-69 years (87% were women) who took care of disabled children in the Patagonia Region, Chile. Interviewer-administered questionnaires were used to collect information on sociodemographic and lifestyle factors. The 14-item Perceived Stress Scale was used to assess perceived stress. Mean relative TL was 0.92 (standard error = 0.03). Smokers had age-adjusted mean TL that was 0.07 units lower (β = -0.07, standard error = 0.03; p = 0.012) than non-smokers. Smokers were 2.17 times more likely to have shorter TL ( < 0.73, the lowest quartile of TL) than non-smokers (odds ratio = 3.17; 95% confidence interval = 1.05-9.52) with adjustment for age and perceived stress. Caregivers with higher perceived stress were 2.13 times more likely to have shorter TL (odds ratio = 3.13; 95% confidence interval = 1.03-9.55) than caregivers with lower perceived stress after adjustment for age and smoking. This study provides the first evidence of strong associations between smoking and perceived stress and shortened salivary TL among caregivers of children with disabilities. Larger studies with detailed information on smoking status are warranted to confirm our findings.
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Affiliation(s)
- Xiaoli Chen
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
- Corresponding author: Xiaoli Chen, MD, PhD, MPH, Department of Epidemiology, Harvard School of Public Health, 677 Huntington Ave, Kresge 500, Boston, MA 02115, Phone: 617-432-0067, Fax: 617 566-7805,
| | - Juan Carlos Velez
- Centro de Rehabilitación Club de Leones Cruz del Sur, Punta Arenas, Chile
| | - Clarita Barbosa
- Centro de Rehabilitación Club de Leones Cruz del Sur, Punta Arenas, Chile
| | - Micah Pepper
- Centro de Rehabilitación Club de Leones Cruz del Sur, Punta Arenas, Chile
| | - Asterio Andrade
- Centro de Rehabilitación Club de Leones Cruz del Sur, Punta Arenas, Chile
| | - Lee Stoner
- School of Sport and Exercise, Massey University, Wellington, New Zealand
| | - Immaculata De Vivo
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115; Program in Genetic Epidemiology and Statistical Genetics, Harvard School of Public Health, Boston, MA, USA
| | - Bizu Gelaye
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
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Drury SS, Mabile E, Brett ZH, Esteves K, Jones E, Shirtcliff EA, Theall KP. The association of telomere length with family violence and disruption. Pediatrics 2014; 134:e128-37. [PMID: 24936002 PMCID: PMC4067635 DOI: 10.1542/peds.2013-3415] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND To enhance the understanding of biological mechanisms connecting early adversity and negative health, we examine the association between family interpersonal violence and disruption and telomere length in youth. These specific exposures were selected because of their established links with negative health consequences across the life-course. METHODS Children, age 5 to 15, were recruited from the greater New Orleans area, and exposure to family disruption and violence was assessed through caregiver report. Telomere length, from buccal cell DNA (buccal telomere length [bTL]), was determined by using monochrome multiplex quantitative real-time polymerase chain reaction. The association between bTL and adversity exposure was tested (n = 80). RESULTS Cumulative exposure to interpersonal violence and family disruption was correlated with bTL. Controlling for other sociodemographic factors, bTL was significantly shorter in children with higher exposure to family violence and disruption. Witnessing family violence exerted a particularly potent impact. A significant gender interaction was found (β = -0.0086, SE = 0.0031, z test= -2.79, P = .0053) and analysis revealed the effect only in girls. CONCLUSIONS bTL is a molecular biomarker of adversity and allostatic load that is detectable in childhood. The present results extend previous studies by demonstrating that telomeres are sensitive to adversity within the overarching family domain. These findings suggest that the family ecology may be an important target for interventions to reduce the biological impact of adversity in the lives of children.
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Affiliation(s)
- Stacy S. Drury
- Department of Psychiatry, Tulane University School of Medicine, New Orleans, Louisiana
| | - Emily Mabile
- Department of Global Community Health, Tulane School of Public Health and Tropical Medicine, New Orleans, Louisiana; and
| | - Zoë H. Brett
- Department of Psychiatry, Tulane University School of Medicine, New Orleans, Louisiana
| | - Kyle Esteves
- Department of Psychiatry, Tulane University School of Medicine, New Orleans, Louisiana
| | - Edward Jones
- Department of Psychiatry, Tulane University School of Medicine, New Orleans, Louisiana
| | | | - Katherine P. Theall
- Department of Global Community Health, Tulane School of Public Health and Tropical Medicine, New Orleans, Louisiana; and
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Holohan B, Wright WE, Shay JW. Cell biology of disease: Telomeropathies: an emerging spectrum disorder. ACTA ACUST UNITED AC 2014; 205:289-99. [PMID: 24821837 PMCID: PMC4018777 DOI: 10.1083/jcb.201401012] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A constellation of related genetic diseases are caused by defects in the telomere maintenance machinery. These disorders, often referred to as telomeropathies, share symptoms and molecular mechanisms, and mounting evidence indicates they are points along a spectrum of disease. Several new causes of these disorders have been recently discovered, and a number of related syndromes may be unrecognized telomeropathies. Progress in the clinical understanding of telomeropathies has in turn driven progress in the basic science of telomere biology. In addition, the pattern of genetic anticipation in some telomeropathies generates thought-provoking questions about the way telomere length impacts the course of these diseases.
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Affiliation(s)
- Brody Holohan
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390
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Theall KP, Brett ZH, Shirtcliff EA, Dunn EC, Drury SS. Neighborhood disorder and telomeres: connecting children's exposure to community level stress and cellular response. Soc Sci Med 2013; 85:50-8. [PMID: 23540366 DOI: 10.1016/j.socscimed.2013.02.030] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 02/15/2013] [Accepted: 02/19/2013] [Indexed: 02/08/2023]
Abstract
Our objective was to explore the utility of salivary telomere length (sTL) as an early indicator of neighborhood-level social environmental risk during child development. We therefore tested the hypothesis that sTL would be associated with markers of social stress exposure in children. Children age 4-14 from 87 neighborhoods were recruited through five urban schools in New Orleans, Louisiana, U.S. Data were collected at the level of the child, family/household, and neighborhood. DNA was obtained from saliva using commercially available kits and sTL was determined for 104 children using quantitative PCR. Analysis was performed on 99 children who had complete data including sTL, social environmental stress, and additional covariates. The mean sTL value was 7.4 T/S (telomere signal/single-copy signal) ratio units (±2.4, range = 2.5-18.0), and 4.7% of the variance in sTL was attributed to differences across neighborhoods. Children living in neighborhoods characterized by high disorder had an sTL value 3.2 units lower than children not living in high disordered environments (p < 0.05) and their odds of having low relative sTL (defined as <1 standard deviation below standardized Z-score mean) values was 3.43 times that of children not living in high disorder environments (adjusted OR = 3.43, 95% CI = 1.22, 9.62). Our findings are consistent with previous studies in adults demonstrating a strong link between psychosocial stress and sTL obtained from peripheral blood, consistent with previous studies in youth demonstrating an association between early life stress and sTL obtained from buccal cell DNA and offer increased support for the hypothesis that sTL represents a non-invasive biological indicator of psychosocial stress exposure (i.e., neighborhood disorder) able to reflect differences in stress exposure levels even in young children.
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Affiliation(s)
- Katherine P Theall
- Department of Global Community Health and Behavioral Sciences, Tulane University School of Public Health and Tropical Medicine, 1440 Canal St., Suite 2301, New Orleans, LA 70112, USA.
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