Abstract
We generated a transgenic line Tg(k18:shh:RFP) with overexpression of Sonic hedgehog in the skin epidermis. By 5 day-post-fertilization (dpf), many epidermal lesions were clearly observed, including a swollen yolk sac, epidermis growth malformation around the eyes and at the basement of the pectoral fins. Skin histology revealed embryos derived from Tg(k18:shh:RFP) displayed an elevated Nuclear/Cytoplasmic ratio and pleomorphic nuclei compared to their wild type littermates, suggesting the abnormal growth pattern on the epidermis of Tg(k18:shh:RFP) embryos were dysplasia. Later (by 7 dpf), Tg(k18:shh:RFP) embryos displayed broader pectoral fins which are similar to the polydactyly phenotypes of Nevoid basal cell carcinoma syndrome (NBCCS)/Gorlin patients and polydactylous mice. In addition, treatment with cyclopamine is able to enhance and prolong the survival rates and survival durations of Tg(k18:shh:RFP) embryos. In conclusion, this unique Tg(k18:shh:RFP) fish line, should be an excellent experimental animal for screening for a lower toxicity level of the new Hh-inhibitor and can even be used as a new anti-cancer drug-screening platform.
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Acknowledgments
We are grateful to Prof. Huai-Jen Tsai, Institute of Molecular and Cellular Biology, National Taiwan University (Taiwan, ROC), who provided the plasmid pZK18RFP. This project was supported by the National Science Council, Republic of China, under grant numbers of NSC 95-2313-B-032-002 and NSC 96-2313-B-032-001-MY3.
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Chen, YH., Wang, YH., Yu, TH. et al. Transgenic zebrafish line with over-expression of Hedgehog on the skin: a useful tool to screen Hedgehog-inhibiting compounds. Transgenic Res 18, 855–864 (2009). https://doi.org/10.1007/s11248-009-9275-y
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DOI: https://doi.org/10.1007/s11248-009-9275-y