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Diurnal rhythm in serum leptin
O D Wolthers1, C Heuck, C Skjaerbaek
1Department of Paediatrics, Randers Hospital, Denmark.
Journal of Pediatric Endocrinology & Metabolism : JPEM
|December 30, 1999
Summary
Serum leptin levels in children show a significant circadian rhythm, with levels increasing at night and decreasing in the morning. This diurnal pattern is crucial for interpreting leptin in clinical research.
Area of Science:
- Pediatric endocrinology
- Chronobiology
- Hormone regulation
Background:
- Leptin is a key hormone regulating energy balance and appetite.
- Understanding the diurnal variation of leptin is essential for accurate assessment in children.
Purpose of the Study:
- To evaluate the 24-hour serum leptin levels in healthy children.
- To identify any circadian rhythm in pediatric leptin concentrations.
Main Methods:
- Studied five girls and two boys (aged 10.4-13.6 years) with pubertal stages I-III.
- Collected blood samples every 2 hours over a 24-hour period.
- Measured serum leptin using radioimmunoassay.
Main Results:
- Demonstrated a statistically significant circadian variation in mean leptin levels (P<0.001).
- Observed peak leptin levels at 24:00 hours and trough levels at 10:00 hours.
- Leptin profile showed a nocturnal increase and a morning decrease.
Conclusions:
- Normal children exhibit a distinct diurnal rhythm in serum leptin.
- The nocturnal rise in leptin may be influenced by insulin.
- This diurnal rhythm must be considered in clinical studies assessing serum leptin.