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Tyr-TGFalpha transgenic mice develop ocular melanocytic lesions.
R Sutton1, C Gordon-Thomson, I A Cree
1School of Science, University of Western Sydney, Penrith South, NSW, Australia.
Melanoma Research
|October 24, 2002
Summary
Transforming growth factor-alpha (TGFalpha) plays a role in melanoma. This study found that mice engineered to express TGFalpha developed ocular melanocytoses and melanocytic lesions in the eye, but not skin abnormalities.
Area of Science:
- Oncology
- Genetics
- Dermatology
Background:
- Transforming growth factor-alpha (TGFalpha) is linked to melanocyte transformation and is present in melanoma cells.
- Its specific role in melanoma development requires further investigation.
Purpose of the Study:
- To investigate the role of TGFalpha in melanoma development using a transgenic mouse model.
- To determine if TGFalpha expression influences melanocyte transformation and lesion formation.
Main Methods:
- Generated transgenic mice by microinjecting a construct containing the mouse tyrosinase promoter and human TGFalpha cDNA.
- Observed and analyzed skin and ocular tissues for abnormalities and melanocytic lesions in transgenic and control mice.
Main Results:
- Transgenic mice did not exhibit significant skin abnormalities.
- However, seven out of 10 transgenic mice developed ocular melanocytoses, characterized by thickened choroid (hyperplasia).
- Melanocytic lesions were found in the posterior eye, with abnormal melanocyte distribution in neural tissue, head skeletal muscle, and Harderian glands, suggesting choroidal migration.
Conclusions:
- Mice engineered to express TGFalpha under the tyrosinase promoter spontaneously develop melanocytic lesions in the eye.
- TGFalpha appears to promote ocular melanocyte hyperplasia and lesion formation, but not skin abnormalities.