PUBLICATION
Comparison of in vivo and in vitro reporter gene assays for short-term screening of estrogenic activity
- Authors
- Legler, J., Zeinstra, L.M., Schuitemaker, F., Lanser, P.H., Bogerd, J., Brouwer, A., Vethaak, A.D., De Voogt, P., Murk, A.J., and Van der Burg, B.
- ID
- ZDB-PUB-021022-2
- Date
- 2002
- Source
- Environmental science & technology 36(20): 4410-4415 (Journal)
- Registered Authors
- Legler, Juliette
- Keywords
- none
- MeSH Terms
-
- Animals
- Breast Neoplasms/pathology
- DDT/analysis
- DDT/pharmacology
- Environmental Monitoring
- Estrogens/analysis*
- Estrogens/pharmacology
- Gene Expression Profiling*
- Insecticides/analysis
- Insecticides/pharmacology
- Luciferases/biosynthesis*
- Receptors, Estrogen/drug effects*
- Tumor Cells, Cultured
- Zebrafish
- PubMed
- 12387416 Full text @ Env. Sci. Tech.
- CTD
- 12387416
Citation
Legler, J., Zeinstra, L.M., Schuitemaker, F., Lanser, P.H., Bogerd, J., Brouwer, A., Vethaak, A.D., De Voogt, P., Murk, A.J., and Van der Burg, B. (2002) Comparison of in vivo and in vitro reporter gene assays for short-term screening of estrogenic activity. Environmental science & technology. 36(20):4410-4415.
Abstract
Functional in vitro and in vivo reporter gene assays have recently been developed for the rapid determination of exposure to (xeno)estrogens. The in vitro estrogen receptor (ER)-mediated chemically activated luciferase gene expression (ER-CALUX) assay uses T47D human breast cancer cells stably transfected with an ER-mediated luciferase gene construct. In the in vivo assay, transgenic zebrafish are used in which the same luciferase construct has been stably introduced. In both assays, luciferase reporter gene activity can be easily quantified following short-term exposure to chemicals activating endogenous estrogen receptors. The objective of this study was to compare responses by known (xeno)estrogenic compounds in both assays. Exposure to the (xeno)estrogens estradiol (E2), estrone, ethynylestradiol (EE2), o,p'-DDT, nonylphenol (NP), and di(2-ethylhexyl)phthalate (DEHP) revealed that EE2 was the most potent (xeno)estrogen tested and was 100 times more potent than E2 in the transgenic zebrafish assay, whereas in the in vitro ER-CALUX assay, EE2 and E2 were equipotent Although the xenoestrogens o,p'-DDT and NP were full estrogen agonists in the in vitro ER-CALUX assay, only o,p'-DDT demonstrated weak dose-related estrogenic activity in vivo. To determine if differences in reporter gene activity may be explained by differential affinity of (xeno)estrogens to human and zebrafish ERs, full-length sequences of the zebrafish ER subtypes alpha, beta, and gamma were cloned, and transactivation by (xeno)estrogens was compared to human ERalpha and ERbeta. Using transiently transfected recombinant ER and reporter gene constructs, EE2 also showed relatively potent activation of zebrafish ERalpha and ERbeta compared to human ERalpha and ERbeta. Zebrafish ERbeta and ERgamma showed higher transactivation by (xeno)estrogens relative to E2 than human ERbeta.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping