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    Pediatrics
    November 2014, VOLUME 134 / ISSUE 5
    Article

    Perinatal Complications and Aging Indicators by Midlife

    Idan Shalev, Avshalom Caspi, Antony Ambler, Daniel W. Belsky, Simon Chapple, Harvey Jay Cohen, Salomon Israel, Richie Poulton, Sandhya Ramrakha, Christine D. Rivera, Karen Sugden, Benjamin Williams, Dieter Wolke, Terrie E. Moffitt
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    Abstract

    BACKGROUND: Perinatal complications predict increased risk for morbidity and early mortality. Evidence of perinatal programming of adult mortality raises the question of what mechanisms embed this long-term effect. We tested a hypothesis related to the theory of developmental origins of health and disease: that perinatal complications assessed at birth predict indicators of accelerated aging by midlife.

    METHODS: Perinatal complications, including both maternal and neonatal complications, were assessed in the Dunedin Multidisciplinary Health and Development Study cohort (N = 1037), a 38-year, prospective longitudinal study of a representative birth cohort. Two aging indicators were assessed at age 38 years, objectively by leukocyte telomere length (TL) and subjectively by perceived facial age.

    RESULTS: Perinatal complications predicted both leukocyte TL (β = −0.101; 95% confidence interval, −0.169 to −0.033; P = .004) and perceived age (β = 0.097; 95% confidence interval, 0.029 to 0.165; P = .005) by midlife. We repeated analyses with controls for measures of family history and social risk that could predispose to perinatal complications and accelerated aging, and for measures of poor health taken in between birth and the age-38 follow-up. These covariates attenuated, but did not fully explain the associations observed between perinatal complications and aging indicators.

    CONCLUSIONS: Our findings provide support for early-life developmental programming by linking newborns’ perinatal complications to accelerated aging at midlife. We observed indications of accelerated aging “inside,” as measured by leukocyte TL, an indicator of cellular aging, and “outside,” as measured by perceived age, an indicator of declining tissue integrity. A better understanding of mechanisms underlying perinatal programming of adult aging is needed.

    • perinatal complications
    • developmental programming
    • aging
    • telomere length
    • perceived age
  • Abbreviations:
    CI —
    confidence interval
    S —
    single-copy gene
    SES —
    socioeconomic status
    T —
    telomere
    TL —
    telomere length
  • What’s Known on This Subject:

    Perinatal complications predict increased risk for morbidity and early mortality. Evidence of perinatal programming of adult mortality raises the question of what mechanisms embed this long-term effect. Telomere length and perceived facial age are 2 indicators of accelerated aging.

    What This Study Adds:

    Perinatal complications predicted greater signs of accelerated aging “inside,” as measured objectively by leukocyte telomere length, an indicator of cellular aging, and “outside,” as measured subjectively by perceived age, an indicator of declining integrity of tissues.

    The model of the developmental origins of health and disease suggests that impaired growth in utero may permanently change the body’s function and metabolism, resulting in accelerated aging.1 Adverse conditions during early development exert a major impact on the etiology and programming of late-life chronic diseases and early mortality.2–6 Evidence of perinatal programming of adult mortality raises the question of what mechanisms embed this long-term effect. We tested the hypothesis that perinatal complications are associated with biomarkers of accelerated aging already at midlife, before onset of aging-related diseases.

    Two biomarkers associated with accelerated aging are telomere length (TL) and perceived age.7,8 Telomeres, the protective caps at the end of chromosomes, erode in somatic tissues with each division of a cell. Both animal and human studies support a link between short TL and early mortality.9–13 Thus, the length of telomeres has been proposed as a “biological clock” for studying cellular aging across the life span and can be observed already in midlife while people are still healthy.14,15 New work has raised the possibility of fetal programming of telomere biology, whereby stress-related maternal–placental–fetal interactions during intrauterine growth regulate the initial setting of TL at birth.6,16,17 Perceived facial age is an assessment of how old a person looks relative to his or her chronological age. The visual signs of aging (eg, skin wrinkles) reflect declining tissue integrity, indicative of the aging process.18 Perceived age is widely used as a general indicator of health by clinicians and is correlated with both TL and early mortality.8,18,19

    We tested the hypothesis that people who experienced perinatal complications would exhibit these signs of accelerated aging by midlife. We followed a cohort prospectively from birth to age 38 years and tested whether those with perinatal complications (assessed at birth) exhibited greater signs of aging inside and outside, that is, at the cellular level (TL) and at the level of facial appearance (perceived age).

    Methods

    Participants

    Participants are members of the Dunedin Multidisciplinary Health and Development Study, a longitudinal investigation of health and behavior in a complete birth cohort. Study members (N = 1037; 91.0% of eligible births; 52.0% male) were all born between April 1972 and March 1973 in Dunedin, New Zealand, were eligible for the longitudinal study based on residence in the Otago province at age 3, and participated in the first follow-up assessment at age 3. The cohort represents the full range of socioeconomic status (SES) in the general population of New Zealand’s South Island and is primarily white. Assessments were carried out at birth and at ages 3, 5, 7, 9, 11, 13, 15, 18, 21, 26, 32, and, most recently, 38 years, when 95.4% of the 1007 living study members underwent assessment in 2010 to 2012. At each assessment wave, each study member is brought to the Dunedin Research Unit for a full day of interviews and examinations. All analyses reported in this study were restricted to white study members who consented to phlebotomy and facial photographs at the age-38 assessment and had data on all measures used here (N = 829). DNA for study members of Maori ancestry is not transported to Duke University for analysis for cultural reasons. There have been 30 deaths since age 3; however, these deaths were not due to aging-related diseases. Causes include road accidents, suicide, overdose, and childhood cancers. By age 38 years, 8 of 829 study members had developed an aging-related diagnosis of type II diabetes, heart attack, stroke, or cancer. The Otago Ethics Committee approved each phase of the study, and informed consent was obtained from all study members.

    Assessment of Perinatal Complications

    Each child was examined shortly after birth, and perinatal information was taken from the hospital records.20,21 As previously described,20 the obstetric complications assessed in this study, including prenatal, intrapartum, and neonatal complications, were maternal diabetes, glycosuria, epilepsy, hypertension, eclampsia, antepartum hemorrhage, accidental hemorrhage, placenta previa, having had a previous small baby, gestational age <37 weeks or >41 weeks, birth weight <2.5 kg, small size for gestational age, major or minor neurologic signs of the neonatal period (eg, jitteriness, tenseness, limpness, hypotonicity), Rh incompatibility, ABO incompatibility, nonhemolytic hyperbilirubinemia, hypoxia at birth (idiopathic respiratory distress syndrome or apnea), and low Apgar score at birth. The infant was defined as having a low Apgar score if 1 of the following conditions applied: At 5 minutes of life, the infant’s heart rate was 100 beats per minute, respiration was irregular or absent, and the infant was centrally cyanotic; the infant took >10 minutes to establish normal respiration; or the infant’s asphyxia at birth warranted resuscitation. The sum of maternal complications and neonate complications was significantly and positively correlated (r = 0.156, P < .001). Based on evidence that the effects of adverse conditions are cumulative,22,23 each condition was weighted equally and summed to yield an obstetric complications index. A total of 530 study members (63.9%) had 0 perinatal complications, 211 (25.5%) had 1 perinatal complication, and 88 (11%) had ≥2.

    Assessment of Aging Indicators

    Measurement of Mean Relative TL at Age 38 Years

    We extracted leukocyte DNA from blood using standard procedures.24,25 Age-38 DNA was stored at −80°C until assayed, to prevent degradation of the samples. All DNA samples were assayed for leukocyte TL at the same time, independently of caseness, and all operations were carried out by a laboratory technician blind to cases or controls. We measured TL by using a validated quantitative polymerase chain reaction method,26 as previously described,27,28 which determines mean TL across all chromosomes for all cells sampled. The method involves 2 quantitative polymerase chain reactions for each subject: 1 for a single-copy gene (S) and the other in the telomeric repeat region (T). All DNA samples were run in triplicate for telomere and single-copy reactions at age 38 years (ie, 6 reactions per study member). The average coefficient of variation for the triplicate cycle threshold values was 0.82% for the T and 0.48% for the S, indicating high assay precision. TL, as measured by T/S ratio, was normally distributed (Kolmogorov–Smirnov tests of normality), with a skew of 0.48 and kurtosis of 0.38 at age 38.

    Perceived Age at 38 Years

    We took 2 measurements of perceived age. First, “age range” was assessed by an independent panel of 4 Duke University undergraduate raters. In a previous methodology article it was shown that raters’ gender, nationality, age, and aging expertise had little effect on the perceived age data generated.18 Raters were presented with standardized (nonsmiling) facial photographs of study members and were kept blind to their actual age. Photos were divided into gender-segregated slideshow batches containing ∼50 photos, viewed for 10 seconds each. Raters were randomly assigned to viewing the slideshow batches in either forward progression or backward progression. They used a Likert scale to categorize each study member into a 5-year age range (ie, from 1 = 20–24 years old up to 10 = 65–70 years; mean = 4.21, SD = 0.76). Scores for each study member were averaged across all raters (α = 0.71). The second measure, “relative age”, was assessed by a different panel of 4 Duke University undergraduate raters. The raters were told that all photos were of people aged 38 years old. Raters then used a 7-item Likert scale to assign a relative age to each study member (1 = young looking, 7 = old looking; mean = 4.14, SD = 0.91). Scores for each study member were averaged across all raters (α = 0.72). “Age range” and “relative age” were highly correlated (r = 0.73). To derive a measure of perceived age at 38 years, we standardized and averaged both “age range” and “relative age” scores to create perceived age at 38 years.

    Alternative Explanatory Variables

    We tested for measures of family history and social risk that could predispose to both perinatal complications and accelerated aging, potentially creating an artifactual association between them. Furthermore, we tested for measures of poor health taken between birth and age-38 follow-up that are known outcomes of perinatal complications,4,5,29–31 and could mediate an association between perinatal complications and accelerated aging. These alternative explanatory variables have been previously published and have good reliability and validity in this cohort. They included family histories of medical problems, childhood social adversity, and poor cognitive health, mental health, vascular health, or physical health. All alternative explanatory variables are described in Table 1.

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    TABLE 1

    Description of Alternative Explanatory Variables That May Explain the Association Between Perinatal Complications and Aging Indicators at 38 y

    Statistics

    We tested the hypothesis that perinatal complications predict aging indicators at age 38 years by regressing each of age-38 TL and age-38 perceived age on a predictor variable indicating the number of perinatal complications for which study members met criteria. To test the possibility that the association between perinatal complications and aging indicators was a consequence of alternative explanatory variables, we reanalyzed the association between perinatal complications and aging indicators, controlling for these variables in ordinary least squares multiple regression analyses. We report standardized coefficients and 95% confidence intervals (CIs) for the 2 aging outcomes. Age was not controlled statistically, because all study members were the same age (1972–1973 births).

    Results

    Both our subjective and objective aging indicators were related in the expected direction. Age-38 leukocyte TL and perceived age were significantly and negatively correlated (r = −0.086, P = .01). Study members with shorter telomeres tended to look older.

    Perinatal complications predicted both age-38 TL (β = −0.101; 95% CI, −0.169 to −0.033; P = .004) (Fig 1A) and age-38 perceived age (β = 0.097; 95% CI, 0.029–0.165; P = .005) (Fig 1B). Study members who had more perinatal complications had shorter telomeres and looked older. Although women had somewhat longer age-38 telomeres than men (men = 1.038 T/S ratio; women = 1.059 T/S ratio, P = .351), associations between perinatal complications and aging indicators did not differ significantly between men and women, which is consistent with results of a recent meta-analysis.32 There was no significant interaction between gender and perinatal complications predicting either TL (β = −0.044; 95% CI, −0.112 to 0.025; P = .21; the T/S ratios for men with 0, 1, and ≥2 perinatal complications were 1.075, 0.961, and 0.983; the comparable T/S ratios for women were 1.061, 1.103, and 0.955) or perceived age (β = 0.010; 95% CI, −0.059 to 0.078; P = .78; the standardized perceived age of men with 0, 1, and ≥2 perinatal complications was −0.051, 0.118, and 0.209; the comparable scores for women were −0.132, −0.055, and 0.131).

    FIGURE 1
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    FIGURE 1

    Association between perinatal complications and (A) leukocyte TL (T/S ratio) and (B) perceived facial age (Z score) at midlife. Error bars reflect SEs.

    We next tested whether alternative explanatory variables that may be associated with perinatal complications, TL, and perceived age accounted for the association between perinatal complications and aging indicators. Table 2 shows that shorter age-38 TL was significantly correlated with family histories of medical problems and poor cognitive health, mental health, and vascular health (P < .05), but not with childhood social adversity (low SES), which is consistent with previous research.33 Age-38 perceived age was significantly correlated with childhood social adversity and poor cognitive health, mental health, and physical health (P < .05). Controlling for these alternative explanatory variables attenuated, but did not fully explain the associations observed between perinatal complications and aging indicators (Table 2).

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    TABLE 2

    Pearson Correlations and Multivariate Linear Regression Analyses of Perinatal Complications, Predicting Leukocyte TL and Perceived Age at 38 y, Controlling for Alternative Explanatory Variables and Gender (N = 829)

    Finally, we tested whether specific perinatal complications were associated with accelerated aging indicators. Although our sample size was not large enough to interrogate each specific type of complication, we had enough cases to interrogate the 2 most common complications: low birth weight (<2.5 kg; N = 43) and small size for gestational age (N = 72).1,34,35 These 2 complications are not synonymous; they were correlated at r = 0.33, and only 29% of infants small for gestational age were low birth weight, as in the general population. Low birth weight predicted both age-38 TL (β = −0.074; 95% CI, −0.142 to −0.006; P = .03) and age-38 perceived age (β = 0.092; 95% CI, 0.024 to 0.160; P = .008). Likewise, small size for gestational age predicted both aging indicators at 38 years (TL, β = −0.074; 95% CI, −0.142 to −0.006; P = .03; perceived age, β = 0.087; 95% CI, 0.019 to 0.155; P = .01).

    Discussion

    Following a cohort from birth to midlife, we found that newborns who presented with more perinatal complications exhibited greater signs of accelerated aging at age 38 years. We observed indications of accelerated aging inside, as measured objectively by leukocyte TL, an indicator of cellular aging, and outside, as measured subjectively by perceived age, an indicator of declining tissue integrity.

    This prospective longitudinal investigation has several strengths. First, all cohort members were the same age, strengthening the test of variation in their pace of aging. Second, the cohort was young enough to detect variation in aging indicators before diseases of aging have begun to develop. Third, we tested 2 indicators of accelerated aging. Although some commentators have questioned whether TL is an appropriate biomarker of aging,36 we confirmed a previous report that shorter TL is associated with older perceived age in the expected direction.8

    We used a perinatal complication index that was previously shown to predict cognitive problems in the Dunedin Study at ages 3, 5, 7, 11, and 13 years.20,37 Notably, our index also predicted a measure of cognitive health averaged from 7 to 38 years (Table 2). There are several approaches for scoring perinatal complications. The 3 most common are a present or absent count of complications38,39 (as is our index), a weighted severity scale based on a clinician’s judgment of risk,40 and a method that uses empirical probabilities of morbidity associated with each perinatal condition.41 A recent review of these approaches for constructing perinatal risk scales concluded that all of them predict cognitive outcomes similarly.23 This review also noted that the ideal system should include prenatal, intrapartum, and neonatal complications; contain items that are commonly measured to assess perinatal risk; have a few items rather than potentially hundreds; and be able to predict developmental outcomes in infancy and early childhood. The Dunedin Study index fulfills these requirements. Although some individual complications can have strong predictive utility,23 our sample size was not large enough to interrogate each specific complication individually (eg, Apgar score or hypoxia). However, the 2 most common complications, low birth weight and small size for gestational age, were significantly associated with both aging indicators at similar effect sizes.

    We acknowledge limitations. First, the Dunedin cohort is primarily white and represents a single birth cohort born in the 1970s. Replication of associations between perinatal complications and aging indicators in other ethnic groups and cohorts is needed. Second, we did not measure TL at birth, given that this technology was not available in the early 1970s, and perceived facial age is not an appropriate measure in this stage of development. This means that we could study only individual differences in indicators of accelerated aging rather than changes from a neonate baseline. Furthermore, we did not control for paternal age at conception, nor did we measure TL in parents, and therefore we could not interrogate whether shorter TL in parents increased neonates’ probability to develop complications at birth. Facial age ratings might be affected by factors apart from aging (eg, sun exposure, fair complexion), so this measure is somewhat noisy, yet there is no obvious reason to suggest such factors covary with perinatal complications to confound our analyses. Perinatal complications predicted TL and facial aging at small effect sizes, but they were comparable to the effect size between perinatal complications and cognitive health (IQ).

    Surprisingly, the association between perinatal complications and aging indicators was not explained by potentially confounding measures of family history and social risk that could predispose to both perinatal complications and accelerated aging, nor was it explained by potentially mediating measures of health taken between birth and age-38 follow-up. This finding, though unexpected, is consistent with previous reports that perinatal complications predict accelerated aging independently of risk factors such as childhood SES, adulthood SES, smoking, and hypertension.42,43 If the association between perinatal complications and the rate of aging at midlife is truly independent of family history and social risks present before birth, and of health states during the first half of the life course, it would suggest that perinatal complications are a primary exposure rather than an indicator of some preexisting risk and that the aging indicators we studied capture information not observable in outward manifestations of health during the first half of the life course.

    Efforts to elaborate the model of the developmental origins of health and disease are concerned with potential mechanisms of perinatal programming. Our correlational observations suggest the hypothesis of a cellular mechanism linking perinatal complications with accelerated aging through erosion of TL.44 Additional support for the accelerated aging process is given by the observation that subjects with perinatal complications tended to look older by midlife. If replicated, the link between perinatal complications and shorter TL suggests several hypotheses for experimental investigations. Future research should elucidate the molecular pathways by which the connection between perinatal complications and accelerated aging occurs.4,14,45 Additional research on younger people needs to test when in life the effect of perinatal complications on TL can initially be observed. Moreover, clinical trials in NICUs could incorporate TL or telomerase measurements at birth, and thereafter at follow-up, as a first step to test the potential early reversibility of this developmental programming of disease. Finally, there is interest in factors that protect some people from the aging-accelerating consequences of perinatal complications. A challenge in pursuing research on this topic is that it is difficult to determine who is resilient until late in life, when diseases of old age have had time to develop. Facial aging and TL provide an opportunity to identify adults at midlife who appear to be resilient to perinatal complications.

    Conclusions

    Perinatal complications predicted greater signs of accelerated aging by midlife. Since our cohort was born in the 1970s, advances in obstetric medicine, particularly in developed countries, have reduced infant mortality and saved lives.46,47 Advances in obstetric medicine in developing regions, home to >80% of the world’s population, will soon also increase the number of survivors with perinatal complications.48–50 Birth outcomes are important determinants of a range of adult attainments,47 and previous research indicates that many newborns who survive perinatal complications carry a lifelong vulnerability to poor health.2–5 Here we present evidence of such sustained vulnerability emerging already in midlife, before aging-related diseases begin to develop. Understanding the underlying mechanism is critical to devising effective intervention strategies. Our findings encourage additional investigation of the link between perinatal complications and indicators of aging in early life.51–53

    Acknowledgments

    We thank the Dunedin study members, unit research staff, Bob Hancox, Murray Thomson, and study founder Phil Silva. The study protocol was approved by the institutional ethical review boards of the participating universities. Study members gave informed consent before participating.

    Footnotes

      • Accepted August 20, 2014.
    • Address correspondence to Idan Shalev, PhD, 219 Biobehavioral Health Building, The Pennsylvania State University, University Park, PA 16802. E-mail: ius14{at}psu.edu
    • Dr Shalev was involved in conception of the study and in reviewing the literature, analyzing and interpreting the data, and writing the draft manuscript; Drs Caspi and Moffitt were involved in the conception and design of the study and in analyzing and interpreting the data and writing the draft manuscript; Mr Ambler, Drs Chapple, Poulton, and Ramrakha, Ms Rivera, Dr Sugden, and Mr Williams were involved in the conception, design, and management of the study; Dr Belsky was involved in the conception of the study and in analyzing and interpreting the data; Drs Cohen, Israel, and Wolke reviewed the report; and all authors approved the final manuscript as submitted.

    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: This research received support from the US National Institute of Aging (grant AG032282) and the UK Medical Research Council (grant MR/K00381X). The Dunedin Multidisciplinary Health and Development Research Unit is supported by the New Zealand Health Research Council. Additional support was provided by the Jacobs Foundation. Dr Belsky was supported by National Institute on Aging grants T32-AG00029 and P30-AG028716-08. Funded by the National Institutes of Health (NIH).

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

    • COMPANION PAPER: A companion to this article can be found on page e1411, online at www.pediatrics.org/cgi/doi/10.1542/peds.2014-2646.

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    Perinatal Complications and Aging Indicators by Midlife
    Idan Shalev, Avshalom Caspi, Antony Ambler, Daniel W. Belsky, Simon Chapple, Harvey Jay Cohen, Salomon Israel, Richie Poulton, Sandhya Ramrakha, Christine D. Rivera, Karen Sugden, Benjamin Williams, Dieter Wolke, Terrie E. Moffitt
    Pediatrics Nov 2014, 134 (5) e1315-e1323; DOI: 10.1542/peds.2014-1669

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    Perinatal Complications and Aging Indicators by Midlife
    Idan Shalev, Avshalom Caspi, Antony Ambler, Daniel W. Belsky, Simon Chapple, Harvey Jay Cohen, Salomon Israel, Richie Poulton, Sandhya Ramrakha, Christine D. Rivera, Karen Sugden, Benjamin Williams, Dieter Wolke, Terrie E. Moffitt
    Pediatrics Nov 2014, 134 (5) e1315-e1323; DOI: 10.1542/peds.2014-1669
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