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Related Experiment Videos

ACTH peptides stimulate motor nerve sprouting in development.

R E Frischer1, F L Strand

  • 1Center for Neuroscience, New York University, New York 10003.

Experimental Neurology
|June 1, 1988
PubMed
Summary

Adrenocorticotropic hormone (ACTH) peptides promote nerve sprouting in developing rat neuromuscular junctions. This effect is most pronounced during the critical first two weeks of postnatal life.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Pharmacology

Background:

  • The neuromuscular junction (NMJ) undergoes significant maturational changes during early postnatal development.
  • Adrenocorticotropic hormone (ACTH) and its analogs are known to influence neuronal development.

Purpose of the Study:

  • To investigate the effects of ACTH 4-10 and its derivative Org 2766 on NMJ maturation in neonatal rats.
  • To determine the dose-dependency and critical time window for peptide-induced nerve sprouting.

Main Methods:

  • Scanning electron microscopy and light microscopy were used to quantify NMJ parameters.
  • Neonatal rats were administered ACTH 4-10 or Org 2766 daily from birth.
  • Measurements included muscle fiber diameter, nerve terminal branching, end-plate area, and perimeter.

Main Results:

  • ACTH 4-10 and Org 2766 stimulated nerve terminal branching in a dose-dependent manner.
  • Org 2766 at a low dose (0.01 microgram/kg) enhanced branching and end-plate perimeter during the first postnatal week.
  • High-dose ACTH 4-10 (10 micrograms/kg) inhibited nerve sprouting; effects diminished by 21 days.
  • Peptide-induced sprouting was limited to the first two postnatal weeks, coinciding with NMJ maturation and the cessation of polyneuronal innervation.

Conclusions:

  • ACTH peptides can modulate nerve sprouting during a critical developmental window at the NMJ.
  • These findings suggest a potential physiological role for ACTH in regulating NMJ development and innervation patterns.

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