A multi‐tissue view on telomere dynamics and postnatal growth

2021 ◽  
Author(s):  
Sarah E. Wolf ◽  
Kimberly A. Rosvall
Keyword(s):  
Postnatal Growth ◽  
Telomere Dynamics

Postnatal growth rate and gonadal development in circadian tau mutant hamsters reared in constant dim red light

Reproduction ◽  
2000 ◽  
pp. 327-330 ◽  
Author(s):  
RJ Lucas ◽  
JA Stirland ◽  
YN Mohammad ◽  
AS Loudon
Keyword(s):  
Time Course ◽  
Red Light ◽  
Somatic Growth ◽  
Postnatal Growth ◽  
Gonadal Development ◽  
Testicular Development ◽  
Wild Type ◽  
Similar Time ◽  
Syrian Hamsters ◽  
Body Weights

The role of the circadian clock in the reproductive development of Syrian hamsters (Mesocricetus auratus was examined in wild type and circadian tau mutant hamsters reared from birth to 26 weeks of age under constant dim red light. Testis diameter and body weights were determined at weekly intervals in male hamsters from 4 weeks of age. In both genotypes, testicular development, subsequent regression and recrudescence exhibited a similar time course. The age at which animals displayed reproductive photosensitivity, as exhibited by testicular regression, was unrelated to circadian genotype (mean +/- SEM: 54 +/- 3 days for wild type and 59 +/- 5 days for tau mutants). In contrast, our studies revealed a significant impact of the mutation on somatic growth, such that tau mutants weighed 18% less than wild types at the end of the experiment. Our study reveals that the juvenile onset of reproductive photoperiodism in Syrian hamsters is not timed by the circadian system.

Relationships of Birthweight and Postnatal Growth with Metabolic Risk Factors in Junior School Children in Korea

2011 ◽  
Vol 7 (3) ◽  
pp. 153-159
Author(s):  
Kyoung Ae Kong ◽  
Hye Ah Lee ◽  
Bo Hyun Park ◽  
Jeong Wan Seo ◽  
Jee Young Oh ◽  
...  
Keyword(s):  
Risk Factors ◽  
School Children ◽  
Postnatal Growth ◽  
Metabolic Risk Factors ◽  
Metabolic Risk

Bronchopulmonary dysplasia and postnatal growth following extremely preterm birth

2020 ◽  
pp. fetalneonatal-2020-320816
Author(s):  
Theodore Dassios ◽  
Emma E Williams ◽  
Ann Hickey ◽  
Catey Bunce ◽  
Anne Greenough
Keyword(s):  
Bronchopulmonary Dysplasia ◽  
Head Circumference ◽  
Outcome Measure ◽  
Postnatal Growth ◽  
Z Score ◽  
Main Outcome Measure ◽  
Extremely Preterm ◽  
Postmenstrual Age ◽  
Extremely Preterm Birth ◽  
Current Incidence

ObjectivesTo report the current incidence of bronchopulmonary dysplasia (BPD) and to compare changes in weight and head circumference between infants who developed BPD and infants who did not.DesignRetrospective, whole-population study.SettingAll neonatal units in England between 2014 and 2018.PatientsAll liveborn infants born <28 completed weeks of gestation.InterventionsThe change in weight z-score (ΔWz) was calculated by subtracting the birthweight z-score from the weight z-score at 36 weeks postmenstrual age (PMA) and at discharge. The change in head circumference z-score (ΔHz) was calculated by subtracting the birth head circumference z-score from the head circumference z-score at discharge.Main outcome measureBPD was defined as the need for any respiratory support at 36 weeks PMA.Results11 806 infants were included in the analysis. The incidence of BPD was 57.5%, and 18.9% of the infants died before 36 weeks PMA. The median (IQR) ΔWz from birth to 36 weeks PMA was significantly smaller in infants who developed BPD (−0.69 (−1.28 to −0.14), n=6105) than in those who did not develop BPD (−0.89 (−1.40 to −0.33), n=2390; adjusted p<0.001). The median (IQR) ΔHz from birth to discharge was significantly smaller in infants who developed BPD (−0.33 (−1.69 to 0.71)) than in those who did not develop BPD (−0.61 (−1.85 to 0.35); adjusted p<0.001).ConclusionsPostnatal growth was better in infants diagnosed with BPD compared with infants without BPD possibly due to more aggressive nutrition strategies.

scholarly journals Prematurity blunts the feeding-induced stimulation of translation initiation signaling and protein synthesis in muscle of neonatal piglets

2019 ◽  
Vol 317 (5) ◽  
pp. E839-E851 ◽  
Author(s):  
Jane K. Naberhuis ◽  
Agus Suryawan ◽  
Hanh V. Nguyen ◽  
Adriana Hernandez-Garcia ◽  
Stephanie M. Cruz ◽  
...  
Keyword(s):  
Protein Synthesis ◽  
Weight Gain ◽  
Preterm Birth ◽  
Translation Initiation ◽  
Body Weight Gain ◽  
Mammalian Target Of Rapamycin ◽  
Postnatal Growth ◽  
Neonatal Piglets ◽  
Relative Body Weight ◽  
Regulate Protein

Postnatal growth of lean mass is commonly blunted in preterm infants and may contribute to short- and long-term morbidities. To determine whether preterm birth alters the protein anabolic response to feeding, piglets were delivered at term or preterm, and fractional protein synthesis rates (Ks) were measured at 3 days of age while fasted or after an enteral meal. Activation of signaling pathways that regulate protein synthesis and degradation were determined. Relative body weight gain was lower in preterm than in term. Gestational age at birth (GAB) did not alter fasting plasma glucose or insulin, but when fed, plasma insulin and glucose rose more slowly, and reached peak value later, in preterm than in term. Feeding increased Ks in longissimus dorsi (LD) and gastrocnemius muscles, heart, pancreas, and kidney in both GAB groups, but the response was blunted in preterm. In diaphragm, lung, jejunum, and brain, feeding increased Ks regardless of GAB. Liver Ks was greater in preterm than term and increased with feeding regardless of GAB. In all tissues, changes in 4EBP1, S6K1, and PKB phosphorylation paralleled changes in Ks. In LD, eIF4E·eIF4G complex formation, phosphorylation of TSC2, mTOR, and rpS6, and association of mammalian target of rapamycin (mTOR1) complex with RagA, RagC, and Rheb were increased by feeding and blunted by prematurity. There were no differences among groups in LD protein degradation markers. Our results demonstrate that preterm birth reduces weight gain and the protein synthetic response to feeding in muscle, pancreas, and kidney, and this is associated with blunted insulin- and/or amino acid-induced translation initiation signaling.

scholarly journals Swedish intrauterine growth reference ranges for estimated fetal weight

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Linda Lindström ◽  
Mårten Ageheim ◽  
Ove Axelsson ◽  
Laith Hussain-Alkhateeb ◽  
Alkistis Skalkidou ◽  
...  
Keyword(s):  
Fetal Growth ◽  
Postnatal Growth ◽  
Fetal Weight ◽  
Hierarchical Regression ◽  
Reference Ranges ◽  
Hierarchical Regression Model ◽  
Gestational Week ◽  
Prospective Longitudinal ◽  
Estimate Fetal Weight ◽  
Estimated Fetal Weight

AbstractFetal growth restriction is a strong risk factor for perinatal morbidity and mortality. Reliable standards are indispensable, both to assess fetal growth and to evaluate birthweight and early postnatal growth in infants born preterm. The aim of this study was to create updated Swedish reference ranges for estimated fetal weight (EFW) from gestational week 12–42. This prospective longitudinal multicentre study included 583 women without known conditions causing aberrant fetal growth. Each woman was assigned a randomly selected protocol of five ultrasound scans from gestational week 12 + 3 to 41 + 6. Hadlock’s 3rd formula was used to estimate fetal weight. A two-level hierarchical regression model was employed to calculate the expected median and variance, expressed in standard deviations and percentiles, for EFW. EFW was higher for males than females. The reference ranges were compared with the presently used Swedish, and international reference ranges. Our reference ranges had higher EFW than the presently used Swedish reference ranges from gestational week 33, and higher median, 2.5th and 97.5th percentiles from gestational week 24 compared with INTERGROWTH-21st. The new reference ranges can be used both for assessment of intrauterine fetal weight and growth, and early postnatal growth in children born preterm.

Weight Growth Velocity and Postnatal Growth Failure in Infants 501 to 1500 Grams: 2000-2013

PEDIATRICS ◽  
2015 ◽  
Vol 136 (1) ◽  
pp. e84-e92 ◽  
Author(s):  
J. D. Horbar ◽  
R. A. Ehrenkranz ◽  
G. J. Badger ◽  
E. M. Edwards ◽  
K. A. Morrow ◽  
...  
Keyword(s):  
Growth Velocity ◽  
Growth Failure ◽  
Postnatal Growth ◽  
Weight Growth ◽  
Postnatal Growth Failure
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