Peptidergic innervation in Hirschsprung's disease.

Area of Science:

• Gastroenterology
• Neuroscience
• Pathology

Background:

• Non-adrenergic, non-cholinergic (NAN)
• autonomous nerves utilize peptides as neurotransmitters.
• The pathophysiology of Hirschsprung's disease remains incompletely understood.

Purpose of the Study:

• To investigate the distribution and occurrence of peptide-containing (peptidergic) nerves in Hirschsprung's disease.
• To elucidate the role of specific peptides in the disease's pathophysiology.

Main Methods:

• Semiquantitative immunohistochemistry was employed.
• Nerves containing encephalin, gastrin-releasing peptide (GRP), vasoactive intestinal peptide (VIP), and substance P were analyzed.
• Tissue samples from four patients who underwent the Duhamel procedure were studied.

Main Results:

• Encephalin and GRP-containing nerves were entirely absent in the aganglionic segment of the colon.
• These nerves were present in the normally ganglionated colon segments.
• VIP and substance P nerves were found in reduced numbers in the aganglionic segment compared to normally innervated areas.

Conclusions:

• The study reveals a significant alteration in peptidergic innervation in Hirschsprung's disease.
• The absence of encephalin and GRP nerves suggests their potential role in the disease's pathogenesis.
• Reduced VIP and substance P innervation may also contribute to the functional deficits observed.