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Neonatal exposure to leptin reduces glucose tolerance in adult mice

H Itoh1, S Yura, N Sagawa

  • 1Department of Gynecology and Obstetrics, Hamamatsu University School of Medicine, Japan. hitou-endo@umin.ac.jp

Acta Physiologica (Oxford, England)
|March 1, 2011
PubMed

Insights

Neonatal leptin treatment, mimicking a premature surge, led to impaired glucose metabolism and insulin sensitivity in adult mice. This suggests leptin acts as a critical programming signal during early development.

Area of Science:

  • Endocrinology
  • Metabolic Research
  • Developmental Biology

Background:

  • Leptin is a key hormone regulating energy balance.
  • Early-life nutrition and hormonal exposures can have long-term metabolic consequences.
  • A premature surge of leptin in neonates may impact future metabolic health.

Purpose of the Study:

  • To investigate the long-term effects of neonatal leptin administration on adult glucose metabolism in mice.
  • To determine if mimicking a premature leptin surge in early life influences insulin sensitivity later in life.

Main Methods:

  • Subcutaneous leptin administration to mouse neonates (5.5-10.5 days of age).
  • Glucose and insulin tolerance tests were performed on adult mice (15-16 weeks of age).
  • Blood glucose and insulin levels were measured following intraperitoneal glucose or insulin challenges.

Main Results:

  • Adult mice treated with leptin neonatally exhibited significantly higher blood glucose levels after glucose challenge compared to controls.
  • Neonatal leptin treatment resulted in significantly higher blood glucose levels after insulin challenge, indicating impaired insulin sensitivity.
  • Insulin levels did not differ significantly between groups after glucose challenge.

Conclusions:

  • A premature surge of leptin during the neonatal period acts as a programming signal.
  • Neonatal leptin exposure is implicated in the developmental origins of impaired insulin sensitivity.
  • Early-life leptin signaling plays a crucial role in establishing long-term metabolic regulation.
Abstract

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