Molecular characterization of Japanese sillago vitellogenin and changes in its expression levels on exposure to 17beta-estradiol and 4-tert-octylphenol.
We cloned a full-length cDNA encoding vitellogenin (VTG) from a marine teleost, the Japanese sillago Sillago japonica. The cloned sillago VTG contained signal peptide, lipovitellin heavy chain, phosvitin, lipovitellin light chain, and beta'-component in the order from the N-terminus. An exposure to 17beta-estradiol significantly increased the levels of plasma VTG, but not hepatic VTG mRNA in males. Neither plasma VTG nor hepatic VTG mRNA levels were affected by the exposure to 4-tert-octylphenol. Hepatic VTG mRNA levels in males increased at 1 day after intraperitoneal administration of 17beta-estradiol but decreased in the subsequent 5 days. However, plasma VTG levels remained high for 5 days after administration, suggesting that the accumulation period of plasma VTG is longer than that of hepatic VTG mRNA in males. Therefore, VTG mRNA may be a suitable indicator of temporal exposure to estrogenic chemicals in the environment, whereas plasma VTG is useful to detect consecutive exposure.
Central Laboratory, Marine Ecology Research Institute, Chiba, Japan.
Sung Ho
SH
Yoon
Yasuo
Y
Itoh
Gen
G
Kaneko
Makiko
M
Nakaniwa
Masataka
M
Ohta
Shugo
S
Watabe
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D004784:Environmental Monitoring / Q000379:methods; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects*; D007274:Injections, Intraperitoneal; D008297:Male; D008969:Molecular Sequence Data; D010473:Perciformes; D010636:Phenols / Q000008:administration & dosage / Q000494:pharmacology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014819:Vitellogenins / Q000097:blood / Q000235:genetics* / Q000378:metabolism*
D017931:DNA Primers; D018076:DNA, Complementary; D010636:Phenols; D014819:Vitellogenins; D004958:Estradiol; C105260:4-tert-octylphenol