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Ret protein in the human fetal rectum
P K Tam1, S J Gould, G Martucciello
1Department of Paediatric Surgery, John Radcliffe Hospital, Oxford, England.
Journal of Pediatric Surgery
|April 1, 1996
Summary
The Ret protein receptor is crucial for enteric nervous system development. Its expression and activity patterns in fetal development offer insights into Hirschsprung
Area of Science:
- Developmental Biology
- Neuroscience
- Genetics
Background:
- Hirschsprung's disease (HD) is linked to the RET proto-oncogene.
- RET gene mutations and Ret protein dysfunction are implicated in HD pathogenesis.
- The precise developmental role of Ret protein in enteric nervous system (ENS) organogenesis remains unclear.
Purpose of the Study:
- To investigate the expression patterns of Ret protein in the developing human ENS.
- To correlate Ret protein expression and tyrosine kinase activity with fetal development.
- To elucidate the role of Ret protein in ENS development and HD pathogenesis.
Main Methods:
- Immunohistochemical analysis of Ret protein expression (anti-Ret C and anti-Ret R5 antibodies) in fetal rectal tissues (12-22 weeks gestation).
- Assessment of ENS tyrosine kinase activity using antiphosphotyrosine antibody.
- Correlation of Ret protein markers with gestational age.
Main Results:
- Ret protein expression was detected in ganglion cells across all fetal ages studied.
- Intense Ret protein expression was higher in younger fetuses.
- Tyrosine kinase activity in ganglion cells increased with gestational age.
- Observed markers in this study resemble those found in the hypoganglionic segments of HD patients.
Conclusions:
- Ret protein plays a critical role in the development and maturation of the human ENS.
- Abnormalities in Ret protein expression or activity may contribute to Hirschsprung's disease.
- The study supports the hypothesis linking Ret protein function to ENS development and HD etiology.