Abstract:
:It 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.
journal_name
Transgenic Resjournal_title
Transgenic researchauthors
Lo AC,Fung MK,Au CL,Chan TS,Sauer B,Chung SS,Chung SKdoi
10.1023/b:trag.0000026072.01351.10subject
Has Abstractpub_date
2004-04-01 00:00:00pages
119-34issue
2eissn
0962-8819issn
1573-9368journal_volume
13pub_type
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