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Expression of estrogen receptors in female rainbow trout (Oncorhynchus mykiss) during first ovarian development and under dense rearing condition.

Abstract：

:To study the expression of four estrogen receptor genes (erα1, erα2, erβ1, erβ2) of female rainbow trout (Oncorhynchus mykiss) during first ovarian development, trouts were sampled from different ovarian stages. Serum E2 (estradiol) was measured by ELISA and estrogen receptors mRNA expression were examined by qRT-PCR. Our results showed a close association between increased erα1 and vitellogenin mRNA expression during ovarian maturation and increased erα2 mRNA expression in mature ovarian stages. Correlation analysis revealed that a negative relationship between serum E2 and ovarian erβ1 (or hepatic erβ2), but ovarian erβ2 mRNA expression was relatively unchanged during first ovarian development. Trout were also reared in different densities as stocking density 1, 2 and 3 (SD1, 4.6-31.1 kg/m3; SD2, 6.6-40.6 kg/m3; SD3, 8.6-49.3 kg/m3) to elucidate effects of high density on estrogen receptor expression. Histology observation showed ovarian development of trout in higher densities were retard with a relatively early stage and fewer vitellogenin accumulation. Trout in high densities showed significantly decreased serum E2, erα mRNA expression and increasing trends of erβ mRNA expression. A noticeable increase of ovarian erβ2 mRNA expression was seen in trout when density is approaching to 50 kg/m3. In conclusion, we may hypothesize that increased erβ mRNA expression triggered by high density result in decreased erα mRNA expression and vitellogenesis. As a result, ovarian development in higher densities was retard.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Hou ZS,Wen HS,Li JF,He F,Li Y,Tao YX

doi

10.1016/j.ygcen.2017.10.001

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

1-11

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(17)30305-2

journal_volume

259

pub_type

杂志文章

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