Transgenic mice over-expressing endothelin-1 in testis transactivated by a Cre/loxP system showed decreased testicular capillary blood flow
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AbstractIt is generally believed that too high or low levels of endothelin-1 (ET-1), a strong vasoconstrictor, may be detrimental to animals. Therefore, in order to understand the in vivo function of ET-1, we used a conditional transgenic approach, Cre/loxP recombination system, to generate transgenic mice that over-express ET-1 in a tissue-specific manner. In such a strategy a single transgenic mouse line, ELSE, was initially generated where a general promoter, human elongation factor 1alpha (hEF1alpha) promoter, was used to drive the expression of a loxP-flanked sequence containing the lacZ reporter gene and a STOP cassette before the ET-1 cDNA, the recombinational competency of which was confirmed in an Escherichia coli test system. In ELSE mice, expression of the reporter lacZ was limited to spermatozoa and spermatogonia as well as Sertoli, Leydig and endothelial cells in the testis, thus confirming the suitability of these mice for the generation of testes-limited ET-1 expression. To generate transgenic progeny with ET-1 over-expression in the testis (successful recombination, ELSE/ELT), ELSE mice were mated with EIIa-cre mice expressing Cre recombinase in pre-implantation mouse embryos. These ELSE/ELT mice exhibiting testis-specific ET-1 over-expression had normal reproductive function and showed no obvious alterations in gross testicular morphology. Although over-expression of ET-1 leads to reduction of testicular blood flow, young adult ELSE/ELT mice showed no obvious signs of inflammation, fibrosis or abnormal proliferation of cells in the testes of young ELSE/ELT mice by histochemical analyses.
All Author(s) ListLo ACY, Fung MKL, Au CL, Chan TSK, Sauer B, Chung SSM, Chung SK
Journal nameTransgenic Research
Year2004
Month4
Day1
Volume Number13
Issue Number2
PublisherKLUWER ACADEMIC PUBL
Pages119 - 134
ISSN0962-8819
LanguagesEnglish-United Kingdom
Keywordsconditional; EF1 alpha; EIIA-cre; transgenic mice; two-tiered
Web of Science Subject CategoriesBiochemical Research Methods; BIOCHEMICAL RESEARCH METHODS; Biochemistry & Molecular Biology; BIOCHEMISTRY & MOLECULAR BIOLOGY; Biotechnology & Applied Microbiology; BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Last updated on 2021-26-02 at 00:40