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Umbilical cord beta-endorphin and early childhood motor development
S J Rothenberg1, A Chicz-DeMet, L Schnaas
1National Institute of Perinatology, México, DF, Mexico.
Insights
High umbilical cord beta-endorphin levels, originating from the fetal pituitary, are linked to better child development. Lower levels may predict developmental delays, particularly in motor skills.
Area of Science:
- Perinatal Medicine
- Developmental Neuroscience
- Endocrinology
Background:
- Elevated umbilical cord plasma beta-endorphin is associated with delivery stress.
- Fetal pituitary is a primary source of cord beta-endorphin.
- Pituitary function is crucial for growth and development.
Purpose of the Study:
- To investigate the relationship between cord beta-endorphin and child development.
- To identify factors influencing cord beta-endorphin levels.
- To determine the impact of stress-independent beta-endorphin on development.
Main Methods:
- Measured paired maternal and cord plasma beta-endorphin in 106 low-risk deliveries using immunoradiometric assay.
- Analyzed correlations between maternal and cord beta-endorphin.
- Used multiple regression to identify predictors of cord beta-endorphin.
- Assessed child development using psychometric tests at various ages.
Main Results:
- Cord beta-endorphin levels were significantly higher than maternal and correlated with maternal levels.
- Forceps delivery, maternal beta-endorphin, bradycardia, vaginal delivery, and birth weight independently predicted elevated cord beta-endorphin.
- Lower cord beta-endorphin predicted more neurological soft signs, lower mental development at 6 months, and lower motor scores at 36 months.
- Poorer fine motor control was associated with lower beta-endorphin.
Conclusions:
- Cord beta-endorphin levels, independent of delivery stress, significantly influence child motor development.
- Higher stress-independent beta-endorphin may directly contribute to motor development.
- Further research is warranted to elucidate the precise role of beta-endorphin in neurodevelopment.
Abstract:
Stress during delivery has been associated with elevated umbilical cord plasma beta-endorphin levels. Published research suggests that much cord beta-endorphin originates from fetal pituitary. Intact pituitary function is required for normal growth and development. Relationships between cord beta-endorphin and child development have not been previously reported. We measured paired maternal and cord plasma beta-endorphin concentration in a set of 106 low risk deliveries by solid phase two-site immunoradiometric assay. Geometric mean maternal and cord beta-endorphin concentrations were 128 pg/ml and 196 pg/ml, respectively, with corresponding ranges of 33-533 pg/ml and 70-579 pg/ml. Cord beta-endorphin concentration was significantly higher than maternal, regardless of delivery mode, and the two were significantly correlated (r = 0.231; P = 0.017). Multiple regression modeling showed that forceps delivery, maternal beta-endorphin concentration, bradycardia, vaginal delivery, and birth weight each made independent contributions to elevated cord beta-endorphin. Depressed cord beta-endorphin predicted more day 2 neurological soft signs, lower 6-month mental development, and lower 36-month motor score on psychometric tests of the children. Poorer fine motor control and coordination were predominantly associated with lower beta-endorphin. Level of cord beta-endorphin independent of delivery stress exerted the primary influence upon child motor development. Higher levels of stress-independent beta-endorphin may play a direct role in motor development.