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Leptin Concentration in Cord Blood Correlates with Intrauterine Growth¹

Departments of Medicine (H.A.K., V.A.K., K.K., L.O.), Pediatrics (S.A.), Obstetrics and Gynecology (S.A., K.A.T.), and Clinical Chemistry (S.-L.K.), Helsinki University Central Hospital, Helsinki, Finland

Address all correspondence and requests for reprints to: Heikki Koistinen, M.D., Department of Medicine, Helsinki University Central Hospital, Haartmaninkatu 4, SF-00290 Helsinki, Finland. E-mail: heikki.koistinen{at}helsinki.fi

Leptin is an adipocyte-derived peptide hormone regulating energy balance in experimental animals. Although the physiological function of leptin in humans is still unclear, its secretion is closely related to fat mass in adult humans. To examine how fetal growth correlates with leptin levels at birth, an umbilical cord venous blood sample was obtained at the delivery from 50 term newborn infants. Twenty-eight of the newborn infants had birth weights appropriate for gestational age (AGA; mean ± SEM, 3362 ± 90 g; relative birth weight, -0.08 ± 0.2 SD), 9 were large for gestational age (birth weight, 4655 ± 165 g; relative birth weight, 3.2 ± 0.3 SD; P < 0.001 vs. AGA newborn infants), and 13 were small for gestational age (SGA; birth weight, 2385 ± 69 g; relative birth weight, -2.2 ± 0.08 SD; P < 0.001 vs. AGA newborn infants). Leptin concentrations were higher in large for gestational age (35.7 ± 8.0 µg/L; P < 0.005), but lower in SGA (3.3 ± 0.5 µg/L; P < 0.001) than in AGA infants (14.5 ± 2.8 µg/L). When adjusted for differences in body weight, mean leptin levels were similar in the three newborn groups. Leptin concentration correlated closely with both absolute and relative birth weights (r = 0.71; P < 0.001 in both), with cord blood insulin concentration (r = 0.67; P < 0.001), and with placental weight (r = 0.60; P < 0.001). These data suggest that leptin is synthesized in utero, and that the circulating leptin concentration relates to the intrauterine growth pattern.

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