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Early life stress experience may blunt hypothalamic leptin signalling

J H Lee1, S B Yoo, J Y Kim

  • 1Department of Oral and Maxillofacial Surgery, Seoul National University School of Dentistry, Seoul, 110-768, Korea.

Journal of Biosciences
|February 24, 2017
PubMed

Insights

Neonatal maternal separation (MS) blunts the anorectic effects of leptin in adolescent offspring. This stress exposure may impair leptin signaling pathways in the hypothalamus, affecting appetite regulation.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Developmental Psychology

Background:

  • Early-life stress, such as maternal separation (MS), can have long-lasting effects on neurodevelopment and behavior.
  • Leptin is a key hormone regulating appetite and energy balance.

Purpose of the Study:

  • To investigate if neonatal maternal separation (MS) impacts the anorectic efficacy of leptin in adolescent offspring.
  • To explore the underlying hypothalamic signaling mechanisms.

Main Methods:

  • Neonatal Sprague-Dawley rat pups underwent daily maternal separation (MS) or were left undisturbed (NH controls).
  • At postnatal day 28, pups received leptin or saline, and food intake and weight gain were measured.
  • Hypothalamic expression of pSTAT3 and PTP1B was analyzed via immunohistochemistry and Western blot.

Main Results:

  • Leptin suppressed food intake and weight gain in non-handled (NH) pups but not in MS pups.
  • Leptin increased hypothalamic pSTAT3 in NH pups, but this effect was absent in MS pups.
  • MS pups exhibited increased basal hypothalamic PTP1B and pSTAT3 levels compared to NH controls.

Conclusions:

  • Neonatal maternal separation may diminish the anorectic efficacy of leptin in adolescence.
  • This blunting may be associated with altered hypothalamic expression of PTP1B and pSTAT3.
  • Early-life stress can disrupt hormonal regulation of appetite later in life.

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