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Placental leptin: an important new growth factor in intrauterine and neonatal development?

Abstract

BACKGROUND

Leptin, the protein product of the ob gene, is produced by the adipocyte and seems to function as a link between adiposity, satiety, and activity. Leptin has also been found to be necessary for pubertal development, conception, and pregnancy in mice, and is increased in prepubertal children, independent of adiposity, suggesting a role in childhood growth and development. This study investigated 100 mother/newborn pairs to determine the role of leptin in neonatal development. Placental tissue was assayed for leptin mRNA to evaluate it as a source of leptin production in utero.

METHODS

One hundred mother/newborn pairs were enrolled in this study. Radioimmunoassay was performed for leptin on maternal venous and newborn cord blood. Leptin concentrations were measured in 43 children in Tanner stages 1 and 2 as a control group. Placental tissue was obtained from five mothers and assayed for leptin mRNA by reverse transcription/polymerase chain reaction (RT/PCR). Human placental cell lines JAR and JEG-3 were also assayed for leptin mRNA expression.

RESULTS

Leptin was present in all newborns studied at a mean concentration of 8.8 ng/mL (+/-9.6 standard deviations). Leptin concentrations in cord blood correlated with newborn weight (r = .51), body mass index (BMI) (r = .48), and arm fat (r = .42). There was no correlation between leptin and insulin. When statistically covarying for adiposity for newborns and Tanner stages 1 and 2 children, newborns had greater concentrations of leptin (mean, 10.57 ng/mL) than children (mean, 3.04 ng/mL). Leptin was present in all mothers at a mean value of 28.8 ng/mL (+/-22.2 standard deviations). Leptin concentration correlated with prepregnancy BMI (r = .56), BMI at time of delivery (r = .74), and arm fat (r = .73). Maternal leptin correlated with serum insulin (r = .49). There was no correlation between maternal and newborn leptin concentrations. Thirteen percent of newborns had higher leptin concentrations than their mothers. Placental tissue from five separate placentas expressed leptin mRNA at comparable or greater levels than adipose tissue. Two human trophoblastic placental cell lines, JAR and JEG-3, also expressed leptin mRNA.

CONCLUSIONS

The correlation between leptin and adiposity found in children and adults was also found in newborns. Serum leptin concentrations in newborns were increased more than three-fold compared with children in Tanner stages 1 and 2 when controlling for adiposity, suggesting that leptin concentrations in the newborn are not explained by adiposity alone. Maternal leptin concentrations correlated with measures of adiposity at delivery but did not correlate with newborn adiposity or leptin. Leptin mRNA was expressed both in placental tissue and in two human placental cell lines. These data suggest that leptin has a role in intrauterine and neonatal development and that the placenta provides a source of leptin for the growing fetus.

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  • Authors+Show Affiliations

    ,

    Department of Pediatrics, Alfred I. duPont Institute, Wilmington, DE 19803, USA.

    , , , , , , , , , , ,

    Source

    Pediatrics 100:1 1997 Jul pg E1

    MeSH

    Adipose Tissue
    Adult
    Age Factors
    Anthropometry
    Biopsy
    Body Mass Index
    Cells, Cultured
    Child
    Child Development
    DNA, Complementary
    Embryonic and Fetal Development
    Factor Analysis, Statistical
    Female
    Fetal Blood
    Humans
    Infant, Newborn
    Insulin
    Leptin
    Male
    Obesity
    Placenta
    Polymerase Chain Reaction
    Pregnancy
    Proteins
    RNA, Messenger
    Reference Values
    Sex Characteristics

    Pub Type(s)

    Clinical Trial
    Controlled Clinical Trial
    Journal Article
    Research Support, Non-U.S. Gov't
    Research Support, U.S. Gov't, P.H.S.

    Language

    eng

    PubMed ID

    9200375

    Citation

    Hassink, S G., et al. "Placental Leptin: an Important New Growth Factor in Intrauterine and Neonatal Development?" Pediatrics, vol. 100, no. 1, 1997, pp. E1.
    Hassink SG, de Lancey E, Sheslow DV, et al. Placental leptin: an important new growth factor in intrauterine and neonatal development? Pediatrics. 1997;100(1):E1.
    Hassink, S. G., de Lancey, E., Sheslow, D. V., Smith-Kirwin, S. M., O'Connor, D. M., Considine, R. V., ... Funanage, V. L. (1997). Placental leptin: an important new growth factor in intrauterine and neonatal development? Pediatrics, 100(1), pp. E1.
    Hassink SG, et al. Placental Leptin: an Important New Growth Factor in Intrauterine and Neonatal Development. Pediatrics. 1997;100(1):E1. PubMed PMID: 9200375.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Placental leptin: an important new growth factor in intrauterine and neonatal development? AU - Hassink,S G, AU - de Lancey,E, AU - Sheslow,D V, AU - Smith-Kirwin,S M, AU - O'Connor,D M, AU - Considine,R V, AU - Opentanova,I, AU - Dostal,K, AU - Spear,M L, AU - Leef,K, AU - Ash,M, AU - Spitzer,A R, AU - Funanage,V L, PY - 1997/7/1/pubmed PY - 1998/4/3/medline PY - 1997/7/1/entrez SP - E1 EP - E1 JF - Pediatrics JO - Pediatrics VL - 100 IS - 1 N2 - BACKGROUND: Leptin, the protein product of the ob gene, is produced by the adipocyte and seems to function as a link between adiposity, satiety, and activity. Leptin has also been found to be necessary for pubertal development, conception, and pregnancy in mice, and is increased in prepubertal children, independent of adiposity, suggesting a role in childhood growth and development. This study investigated 100 mother/newborn pairs to determine the role of leptin in neonatal development. Placental tissue was assayed for leptin mRNA to evaluate it as a source of leptin production in utero. METHODS: One hundred mother/newborn pairs were enrolled in this study. Radioimmunoassay was performed for leptin on maternal venous and newborn cord blood. Leptin concentrations were measured in 43 children in Tanner stages 1 and 2 as a control group. Placental tissue was obtained from five mothers and assayed for leptin mRNA by reverse transcription/polymerase chain reaction (RT/PCR). Human placental cell lines JAR and JEG-3 were also assayed for leptin mRNA expression. RESULTS: Leptin was present in all newborns studied at a mean concentration of 8.8 ng/mL (+/-9.6 standard deviations). Leptin concentrations in cord blood correlated with newborn weight (r = .51), body mass index (BMI) (r = .48), and arm fat (r = .42). There was no correlation between leptin and insulin. When statistically covarying for adiposity for newborns and Tanner stages 1 and 2 children, newborns had greater concentrations of leptin (mean, 10.57 ng/mL) than children (mean, 3.04 ng/mL). Leptin was present in all mothers at a mean value of 28.8 ng/mL (+/-22.2 standard deviations). Leptin concentration correlated with prepregnancy BMI (r = .56), BMI at time of delivery (r = .74), and arm fat (r = .73). Maternal leptin correlated with serum insulin (r = .49). There was no correlation between maternal and newborn leptin concentrations. Thirteen percent of newborns had higher leptin concentrations than their mothers. Placental tissue from five separate placentas expressed leptin mRNA at comparable or greater levels than adipose tissue. Two human trophoblastic placental cell lines, JAR and JEG-3, also expressed leptin mRNA. CONCLUSIONS: The correlation between leptin and adiposity found in children and adults was also found in newborns. Serum leptin concentrations in newborns were increased more than three-fold compared with children in Tanner stages 1 and 2 when controlling for adiposity, suggesting that leptin concentrations in the newborn are not explained by adiposity alone. Maternal leptin concentrations correlated with measures of adiposity at delivery but did not correlate with newborn adiposity or leptin. Leptin mRNA was expressed both in placental tissue and in two human placental cell lines. These data suggest that leptin has a role in intrauterine and neonatal development and that the placenta provides a source of leptin for the growing fetus. SN - 1098-4275 UR - https://www.unboundmedicine.com/medline/citation/9200375/Placental_leptin:_an_important_new_growth_factor_in_intrauterine_and_neonatal_development L2 - http://pediatrics.aappublications.org/cgi/pmidlookup?view=long&pmid=9200375 DB - PRIME DP - Unbound Medicine ER -