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Epidermal growth factor modulates fetal thymocyte growth and differentiation
C S Freitas1, S R Dalmau, K Kovary
1Department of Immunology, Basic Research Center, National Cancer Institute of Rio de Janeiro, Brasil.
Developmental Immunology
|December 16, 1998
Summary
Epidermal growth factor (EGF) addition to fetal organ cultures decreases thymus cellularity and hinders T-cell development. EGF appears to block the generation of alpha-beta T-cell receptor thymocytes.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- Epidermal Growth Factor (EGF) receptors are present on adult thymus cells.
- EGF's role in thymus development is not fully understood.
Purpose of the Study:
- To investigate the effect of EGF on fetal thymus ontogeny.
- To understand EGF's impact on thymocyte differentiation and T-cell receptor (TCR) development.
Main Methods:
- Fetal organ culture (FTOC) technique was employed.
- Exogenous EGF was added to fetal thymus cultures for 7 days.
- Cellularity, differentiation stages (CD4/CD8), and TCR expression were analyzed.
Main Results:
- EGF caused a dose-dependent decrease in cellularity.
- EGF retained thymocytes at the double-negative (CD4-/CD8-) stage.
- EGF promoted the development of gamma-delta TCR+ cells but inhibited alpha-beta TCR+ thymocyte generation.
- A high molecular weight "EGF-like" molecule was detected on fetal thymocytes.
Conclusions:
- EGF significantly impacts fetal thymus development and thymocyte differentiation.
- EGF appears to create a non-permissive environment for alpha-beta TCR+ thymocyte generation.
- The role of the detected "EGF-like" molecule requires further investigation.