ZFIN ID: ZDB-PUB-100322-18
Levels of 17beta-estradiol receptors expressed in embryonic and adult zebrafish following in vivo treatment of natural or synthetic ligands
Chandrasekar, G., Archer, A., Gustafsson, J.A., and Andersson Lendahl, M.
Date: 2010
Source: PLoS One   5(3): e9678 (Journal)
Registered Authors: Lendahl, Monika Andersson
Keywords: none
MeSH Terms:
  • Animals
  • Computational Biology/methods
  • Developmental Biology/methods
  • Endocrine System
  • Estradiol/metabolism*
  • Female
  • Gene Expression Regulation, Developmental*
  • Ligands
  • Male
  • Phenols/pharmacology
  • Protein Isoforms
  • Receptors, Estradiol/biosynthesis*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Tissue Distribution
  • Zebrafish
PubMed: 20300630 Full text @ PLoS One
The nuclear receptors encompass a group of regulatory proteins involved in a number of physiological processes. The estrogen receptors (ERs), of which one alpha and one beta form exist in mammals function as transcription factors in response to 17beta-estradiol (E2). In zebrafish there are three gene products of estrogen receptors and they are denoted esr1 (ERalpha), esr2a (ERbeta2) and esr2b (ERbeta1). Total RNA of zebrafish early life stages (<3, 6, 12, 24, 48, 72, 96 and 120 hours post fertilization) and of adult fish (liver, intestine, eye, heart, brain, ovary, testis, gill, swim bladder and kidney) were isolated following in vivo exposures. Using specific primers for each of the three zebrafish ERs the expression levels were quantified using real time PCR methodology. It was shown that in absence of exposure all three estrogen receptors were expressed in adult fish. The levels of expression of two of these three ER genes, the esr1 and esr2a were altered in organs such as liver, intestine, brain and testis in response to ligand (E2, diethylstilbestrol or 4-nonylphenol). During embryogenesis two of the three receptor genes, esr1 and esr2b were expressed, and in presence of ligand the mRNA levels of these two genes increased. The conclusions are i) estrogen receptor genes are expressed during early development ii) altered expression of esr genes in response to ligand is dependent on the cellular context; iii) the estrogenic ligand 4-nonylphenol, a manufactured compound commonly found in sewage of water treatment plants, acts as an agonist of the estrogen receptor during development and has both agonist and antagonist properties in tissues of adult fish. This knowledge of esr gene function in development and in adult life will help to understand mechanisms of interfering mimicking endocrine chemicals in vivo.