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Abstract
Background/Purpose: In 1996, the glial cell line-derived neurotrophic factor (GDNF) was identified as
one of the ligands of the RET transmembrane receptor. In the same year, GDNF mutations were found in association with RET protooncogene mutations in Hirschsprung patients. Mutations in GDNF per se are thought neither necessary nor sufficient to cause Hirschsprung's disease
(HD). To data, our study group has identified GDNF mutations only in 2 of 98 cases of intestinal dysganglionosis. The aim of our study
was to investigate a possible expression deficit of GDNF in the enteric nervous system of Hirschsprung patients not mutated for the GDNF gene.
Methods: We used rabbit polyclonal antibodies raised against a peptide corresponding to amino
acids 186–205 mapping within the carboxy-terminal domain of human GDNF. GDNF expression was studied immunohistochemically in surgical specimens from 30 HD cases
(27 classic forms and 3 ultralong forms) and from 10 age-matched controls. Serial
sections from the same full-thickness specimens were investigated with the following
histochemical and immunohistochemical techniques: acetylcholinesterase, lactate dehydrogenase,
succinic dehydrogenase, α-naphthylesterase, glial fibrillary acid protein, S-100 protein,
and neuron-specific enolase.
Results: A high level of GDNF expression was found in normal intestine and in Hirschsprung ganglionic segment.
Satellite elements of myenteric ganglia presented a strong immunoreactivity to GDNF.
Conversely, the aganglionic segment showed cholinergic hyperinnervation and hypertrophic
trunks of nerve fibers in the muscular interstitium with complete absence of GDNF expression. The small ganglia of the hypoganglionic segment showed a reduced GDNF
immunoreactivity.
Conclusions: GDNF, a distantly related member of the transforming growth factor-beta superfamily,
is a potent neurotrophic and survival factor for neurons and enteric ganglion cells.
Mutations of the GDNF gene or GDNF expression deficit interrupt the faithful GDNF signaling via Ret, contributing to
HD pathogenesis.
Keywords
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Article info
Footnotes
☆Presented at the 44th Annual International Congress of the British Association of Paediatric Surgeons, Istanbul, Turkey, July 22–25, 1997.
Identification
Copyright
© 1998 Published by Elsevier Inc.