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Polyamines induce precocious development in rats. Possible interaction with growth factors.

G M Gilad1, M Dornay, V H Gilad

  • 1Neuropsychiatry Branch, NIMH Neuroscience Center, Saint Elizabeths Hospital, Washington, DC 20032.

International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience
|January 1, 1989
PubMed
Summary

Daily polyamine injections in newborn rats accelerated somatic and neurobehavioral development. This treatment also protected against weight loss from surgical injury, suggesting polyamines

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Neuroscience

Background:

  • Polyamines (putrescine, spermidine, spermine) are essential biogenic compounds.
  • Their role in postnatal development and response to injury requires further elucidation.

Purpose of the Study:

  • To investigate the effects of exogenous polyamines on postnatal growth and neurobehavioral development in rats.
  • To explore the potential mechanisms of polyamine action, including influence on growth factors and hormonal pathways.

Main Methods:

  • Daily subcutaneous injections of putrescine, spermidine, and spermine (10 mg/kg each) to newborn rats.
  • Assessment of body weight, developmental milestones (eyelid/ear opening), and neurobehavioral reflexes (righting/gripping).
  • Histological analysis of the superior cervical ganglion and immunohistochemical detection of growth factors (NGF, EGF) in specific tissues.

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Main Results:

  • Polyamine treatment slightly enhanced normal weight gain but significantly prevented weight loss post-surgical injury.
  • Accelerated maturation of eyelid/ear opening and righting/gripping reflexes observed.
  • Increased superior cervical ganglion neuron count, unaffected by neonatal castration.
  • Apparent increase in nerve growth factor (NGF) in iris and salivary gland; no change in epidermal growth factor (EGF).

Conclusions:

  • Exogenous polyamines can accelerate somatic and neurobehavioral development in newborn rats.
  • Polyamines may influence growth factors, warranting further quantitative investigation.
  • Exogenous polyamines may promote growth in cell types dependent on these compounds during specific developmental periods.