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Peptide immunoreactivity in developing entero-endocrine cells in endodermal grafts
J Drukker1, E A Terwindt-Rouwenhorst, E L Wiertz-Hoessels
1Department of Anatomy and Embryology, University of Limburg, Maastricht, The Netherlands.
Insights
Grafting embryonic endoderm with notochord induced differentiation into digestive and respiratory tissues. These tissues developed entero-endocrine cells with peptide profiles resembling normal development, but with increased peptide expression.
Area of Science:
- Developmental biology
- Stem cell differentiation
- Endocrinology
Background:
- The developmental potential of embryonic tissues is a key area in developmental biology.
- Understanding the factors that influence tissue differentiation is crucial for regenerative medicine.
Purpose of the Study:
- To investigate the differentiation capacity of presumptive endoderm when grafted with notochord.
- To analyze the development of entero-endocrine cells and their peptide expression in the grafted tissue.
Main Methods:
- Excising presumptive endoderm from chick or quail embryos (19 hours).
- Grafting the endoderm with chick notochord (48 hours).
- Analyzing graft differentiation and entero-endocrine cell peptide immunoreactivity after 14 days.
Main Results:
- Grafted presumptive endoderm differentiated into digestive and respiratory tract structures.
- Entero-endocrine cells were identified within these differentiated structures.
- Peptide immunoreactivity in grafted tissues showed similarities to normal development, with a higher number of demonstrable peptides.
Conclusions:
- Presumptive endoderm possesses significant differentiation potential when provided with appropriate inductive signals like notochord.
- Grafted tissues can form functional entero-endocrine cells.
- Grafting conditions may enhance peptide expression compared to normal development.
Abstract:
Presumptive endoderm was excised from 19-h chick or quail embryos and grafted, together with a fragment of notochord from a 48-h host chick embryo. After 14 days the graft showed differentiation towards several digestive and respiratory tract structures. Entero-endocrine cells were demonstrated in these structures. Peptide immunoreactivity in these structures was similar to some extent to the peptide spectrum in corresponding regions during normal development, though the number of demonstrable peptides per region under the conditions of grafting appeared to be higher than in control conditions.
