Targeted pituitary tumorigenesis using the human thyrotropin β-subunit chain promoter in transgenic mice
| Autor: | Kon Yasuhiro, Hayashizaki Yoshihide, Takahashi Eiki, Sasaki Nobuya, Yamashita Tadashi, Maki Kazushige, Namioka Shigeo, Kasai Noriyuki, Miyoshi Ichiro, Aoyama Shiro |
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| Rok vydání: | 1994 |
| Předmět: |
Male
Genetically modified mouse SV40 large T antigen Antigens Polyomavirus Transforming Transgene Molecular Sequence Data Thyrotropin Mice Transgenic Biology Polymerase Chain Reaction Biochemistry Mice Endocrinology Anterior pituitary Pituitary Gland Anterior medicine Animals Pituitary Neoplasms RNA Messenger Promoter Regions Genetic Molecular Biology Gene DNA Primers Messenger RNA Base Sequence Pituitary tumors medicine.disease Immunohistochemistry Molecular biology Gene Expression Regulation Neoplastic Mice Inbred C57BL Disease Models Animal Cell Transformation Neoplastic medicine.anatomical_structure Female |
| Zdroj: | Molecular and Cellular Endocrinology. 105:147-154 |
| ISSN: | 0303-7207 |
| DOI: | 10.1016/0303-7207(94)90164-3 |
| Popis: | We have generated transgenic mice that express the simian virus 40 (SV40) large T antigen under the control of a 1109 bp 5'-flanking sequence of the human thyrotropin β-subunit (TSHβ) gene. The hybrid gene, termed TTP-1, was microinjected into fertilized mouse eggs and 11 transgenic mice were obtained. One of the transgenic mice, a female, a phenotypical dwarf, developed a pituitary tumor and wasted away from 7 to 9 weeks after birth. To establish the transgenic mouse line, her ovaries were transferred to a normal female, whose ovaries were removed beforehand. To examine the tissue specificity of transgene expression, mRNA of SV40 large T antigen was monitored in various tissues from the transgenic mice by the reverse transcriptase-polymerase chain reaction analysis, and was detected only in the pituitary. Histological and immunohistochemical analyses showed that the pituitary tumors of the transgenic mice were composed of poorly differentiated pituitary cells expressing SV40 large T antigen. These results indicated that the 1109 bp sequence of the human TSHβ 5'-flanking region is essential for pituitary-specific expression of SV40 large T antigen in transgenic mice, which exhibited a dwarf phenotype and developed pituitary tumors. The tumors were composed of undifferentiated cells and did not produce thyrotropin. These transgenic mice should provide a valuable animal model for studying the patho.genesis of anterior pituitary tumors. |
| Databáze: | OpenAIRE |
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