Title
Neonatal neuromuscular parameters vary in susceptibility to postnatal ACTH/MSH 4-10 administration
UMMS Affiliation
Department of Psychiatry
Publication Date
1988-01-01
Document Type
Article
Subjects
Adrenocorticotropic Hormone; Animals; Animals, Newborn; Behavior, Animal; Electrophysiology; Melanocyte-Stimulating Hormones; Motor Endplate; Muscles; Neuromuscular Junction; Peptide Fragments; Rats; Rats, Inbred Strains
Disciplines
Psychiatry
Abstract
Neonatal Sprague-Dawley rats administered the fragment of adrenocorticotropic hormone ACTH/MSH 4-10 (10 micrograms/kg/daily, SC) postnatally, show marked differences in the plasticity of the functional and morphological parameters of their neuromuscular system. Initial contraction durations of the immature fast muscle, extensor digitorum longus (EDL), are shorter than saline-treated controls indicating accelerated development. Qualitative studies of the developing EDL neuromuscular junctions as viewed by the scanning electron microscope and quantitative analysis permitted by light microscopy confirms that ACTH/MSH 4-10 affects the maturation of the endplate region. Motor behavior of rat pups demonstrates an age-related difference in the susceptibility to this peptide fragment; one week old neonates showing no response to ACTH/MSH 4-10, two week old pups showing an increase in motor activity. The results indicate that while the developing neuromuscular system is sensitive to the input of ACTH/MSH peptide treatment, this susceptibility is age-related.
Source
Peptides. 1988 Jan-Feb;9(1):151-6.
Journal/Book/Conference Title
Peptides
Related Resources
PubMed ID
2834699
Repository Citation
Rose KJ, Frischer RE, King JA, Strand FL. (1988). Neonatal neuromuscular parameters vary in susceptibility to postnatal ACTH/MSH 4-10 administration. Psychiatry Publications and Presentations. Retrieved from https://escholarship.umassmed.edu/psych_pp/335