Hormonal regulation of hepatic IGF-I and IGF-II gene expression in the marine teleost Sparus aurata.
The present work aimed to determine whether GnRH potentiates the effect of growth hormone (GH) on insulin-like growth factors (IGF-I and IGF-II) hepatic gene expression in Sparus aurata liver. Since several hepatic genes were shown to underlie direct regulation via the hepatic estrogen receptor, another aim was to extend our understanding of direct estrogen effects on liver IGFs gene expression. Pre-reproductive sea bream females were treated with GH, GnRH, estradiol-17beta, GH plus GnRH, and estradiol-17beta plus GH. After 72 hr, all treatment induced an increase of plasma estradiol well correlated with the increase of plasma vitellogenin (VTG) levels. IGF-I and IGF-II expression in the liver of treated females was determined by semi-quantitative RT-PCR, using beta-actin as internal standard. The results reported here show that GH significantly stimulates hepatic transcription of IGF-I and IGF-II genes. Surprisingly, E2 and GnRH treatments decreased both IGF-I and IGF-II mRNA levels. In fishes treated with GH plus GnRH, the GnRH contrasted the GH effect: the IGF-I mRNA levels were still significantly higher than in controls, while the effect of GH on IGF-II gene expression was totally abolished. At the same time, in the combined treatment with GH plus E2, the E2 counteracted the stimulatory effect of GH on both IGF-I and IGF-II genes expression.
Carnevali
Oliana
O
Dipartimento di Scienze del Mare, Università Politecnica delle Marche, Ancona, Italy. carnevali@univpm.it
Cardinali
Marco
M
Maradonna
Francesca
F
Parisi
Marco
M
Olivotto
Ike
I
Polzonetti-Magni
Alberta M
AM
Mosconi
Gilberto
G
Funkenstein
Bruria
B
D000818:Animals; D004958:Estradiol / Q000097:blood*; D005260:Female; D005786:Gene Expression Regulation; D007334:Insulin-Like Growth Factor I / Q000235:genetics*; D007335:Insulin-Like Growth Factor II / Q000235:genetics*; D008099:Liver / Q000737:chemistry / Q000378:metabolism*; D021541:Sea Bream / Q000235:genetics*; D014819:Vitellogenins / Q000097:blood
D014819:Vitellogenins; D004958:Estradiol; D007334:Insulin-Like Growth Factor I; D007335:Insulin-Like Growth Factor II