• Title/Summary/Keyword: vitellogenin production

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Vitellogenin Production of Marine Fishes Exposed to E2 (17$\beta$-estradiol 처리에 따른 해산 어류의 vitellogenin 생성)

  • 황인영;박정규;이은경
    • Environmental Analysis Health and Toxicology
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    • v.16 no.1
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    • pp.21-28
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    • 2001
  • A common used endpoint in bioassays testing the estrogenicity of chemicals including endocrine disruptors is the induction of egg yolk Precursor vitellogenin in male fish. Two marine fishes (Sebastes schlegeli and Paralichthys olivaceus) were exposed to the 17$\beta$-estradiol(E2) to determine the vitellogenin production. Vitellogenin was measured in fish blood using SDS-PAGE and Densimetry. Results showed that exposure to E2 caused vitellogenin in male fish. Especially, vitellogenin levels in young fish were about 4 times higher than in adult fish, which means young fish are more sensitive to E2 exposure. And plasma vitellogenin in fish increased related to E2 concentration and exposure duration.

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Vitellogenin as a Biomarker of Endocrine Disrupter in the Aquatic Environment

  • Ryu, Beoung-Ho
    • Journal of Food Hygiene and Safety
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    • v.14 no.4
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    • pp.408-414
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    • 1999
  • A number of chemical released into the environment eliciting their effects by disrupting normal hormonal pathways. Endocrine disrupting compounds are present in the aquatic environment and pose potential health consequences to wildlife and humans. This review are designing fur xenobiotic estrogens based on induction of the egg-yolk precursor protein vitelloge-nin. In fish of aquatic environment, it may result in decrease fertility and egg production in females or lead to reduced gonad size or feminization of genetic male fish. It has been known that male fish exposed to estrogenic compounds show induced production of vitellogenin. Vitello-genin production is normally restricted to adult females, which have elevated estrogen levels during egg production. However, vitellogenin can be induced in males by Pollution of environmental endocrine disruptors. Consequently, the presence of vitellogenin in male fish can serve as an indicator of exposure of environmental endocrine disrupting compounds. In immature fish pol-luted at low levels of environmental endocrine disrupter, vitellogenin can serve as a reliable biomarker for exposure to endocrine disrupter. This review demonstrates the utility of vitellogenin as a biomarker fur exposure to estrogenin agents in auqatic environment.

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Effects of Calcium Ionophore on Vitellogenin Production in the Culture of Hepatocytes in the Rinbow Trout, Oncorhynchus mykess (무지개송어(Oncorhynchus mykiss) 배양 간세포에서 Vitellogenin 합성에 미치는 Calcium ionophore의 영향)

  • 여인규
    • Journal of Aquaculture
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    • v.11 no.2
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    • pp.241-248
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    • 1998
  • Effects of A23187 on estradiol$-17^{\beta}$-induced vitellogenin (VTG) induction were electrophore-tically examined in primary hepatocyte cultures in rainbow trout. hepatocytes were predultured for 2 days and then estradiol-$17^{\beta}$(E2, $2{\times}10^{-6}$M) and calcium ionophore (A23187, $10^{-7)$~$10^{-5}$ M) were added to the incubation medium. The hepatocytes were cultured for 7 more days. In addition, effects of A23187 on $E_2$-primed VTG production were investigated for 7 days. The addition of A23187 ($10^{-7)$~$10^{-5}$M) to the incubation medium specifically reduced VTG production by hepatocytes in a concentration-dependent way. The addition of A23187 significantly reduced the rate of $E_2$-primed VTG production to 18% of the control (E2 only) on Day 7. However, $E_2$-primed VTG production was reduced to 47% of the control by withdrawal of $E_2$ from the incubation medium. Therefore, these results suggest that intracellualr sequestered calcium could regulate VTG synthesis at the translational and/or post-translational stage.

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Effects of High Intracellular Calcium Concentration by Ouabain on VTG Production in the Primary Hepatocyte Cultures of Rainbow Trout, Oncorhynchus mykiss. (무지개송어(Oncorhynchus mykiss)간세포배양에 있어서 Ouabain에 의한 세포내 고Calcium 농도가 Vitellogenin 합성에 미치는 효과)

  • Yeo, In-Kyu
    • Journal of Aquaculture
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    • v.11 no.2
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    • pp.279-282
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    • 1998
  • Effects of high concentration of intracellular calcium on estradiol-induced vitellogenin(VTG) induction were examined using ouabain in Primary hepatocyte culture in the rainbow trout Oncorhynchus mykiss. Ouabain increases cytosolic free calcium as a result of inhibition of $Na^+ - Ca^{2+}$ exchanger. Ouabain markedly reduced VTG production to the control level, despite of calcium concentrations in the incubatin medium. Therefore, ouabain would reduce VTG production not by increasing intracellular calcium bt directly by inhibiting $Na^+ - K^+$ ATPase.

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Stimulatory Effects of cyclic AMP on Vitellogenin Induction by Estradiol-17$\beta$ in the Primary Culture of Hepatocytes in the Rainbow Trout Oncorhynchus mykiss

  • Yeo In-Kyu
    • Fisheries and Aquatic Sciences
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    • v.1 no.2
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    • pp.153-158
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    • 1998
  • Effects of cyclic (c) AMP and G-protein related reagents (3-isobutyl-l-methyxanthine (IBMX), Forskolin (FSK), cholera toxin (CTX), and pertussis toxin (PTX≫ on estradiol-17$\beta$ induced vitellogenin (VTG) induction were examined in primary hepatocyte cultures in rainbow trout Oncorhynchus mykiss. The addition of IBMX, FSK, or CTX to the incubation medium markedly increased VTG production, while PTX was not effective in stimulating the production. It is well known that cAMP regulates phosphorylation and dephosphorylation through mediation of protein kinase A. These results suggest that VTG production is highly dependent on cAMP state in hepatocytes because of its highly phosphorylated nature.

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Effect of Growth Hormone on Vitellogenin Production by Estradiol-17$\beta$ in the Culture of Hepatocytes in the Rainbow Trout Oncorhynchus mykiss

  • Yeo In-Kyu;Mugiya Yasuo
    • Fisheries and Aquatic Sciences
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    • v.1 no.1
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    • pp.19-23
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    • 1998
  • Effects of pituitary and thyroid hormones on estradiol-induced vitellogenin (VTG) induction were electrophoretically examined in primary hepatocyte cultures of rainbow trout. Hepatocytes were precultured for 2 days and then estradiol-17 $\beta$ $(E_2,\;2 \times 10^{-6}M)$>, triiodothyronine $(T_3,\;10^{-8}-10^{-6}M)$, bovine growth hormone (bGH, 10-100 ng/ml), ovine prolactin (oPRL, 100-500 ng/ml), and pituitary extract (PE) of rainbow trout (0.75PE/dish) were added to the incubation medium. The hepatocytes were cultured for 7 more days. The addition of oPRL to the incubation medium was not effective in increasing VTG production at any concentrations. The addition of PE to the incubation medium with $E_2$ was not effective in increasing VTG production. The addition of bGH to the incubation medium with $E_2$ was not effective in increasing the rate of VTG production at concentrations of 10-50 ng/ml. However, a higher concentration of bGH, 100 ng/ml, increased VTG production. The various concentrations of $T_3$ were ineffective in stimulating VTG production. These results suggest that GH could be one of stimulus factors for VTG production in rainbow trout.

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Effect of Extracellular Calcium on Vitellogenin Production in the Culture of Hepatocytes in the Rainbow Trout, Oncorhynchus mykiss

  • Yeo In-Kyu;Mugiya Yasuo;Chang Young Jin;Hur Sung Bum;Yoo Sung Kyu
    • Fisheries and Aquatic Sciences
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    • v.1 no.1
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    • pp.24-29
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    • 1998
  • Effect of extracellular calcium in vitellogenin (VTG) production in response to estradiol-17 $\beta$ $(E_2,\;2\times10^{-6}M)$ was examined in primary hepatocyte culture of rainbow trout, Onchorhynchus mykiss. Total calcium in estrogenized sera significantly increased, compared with the control, while diffusible calcium was insignificant. However, diffusible calcium in the incubation medium with $E_2$ was significantly reduced, compared with the control. The uptake of extracellular calcium by cultured hepatocytes signifIcantly increased 90 min after $E_2$ addition. Moreover, the accumulation of intracellular calcium increased in the cultures with $E_2$, regardless of the calcium concentrations in the incubation media. In addition, $E_2-primed $ VTG production was significantly decreased by withdrawal of E_2$ from the incubation medium. Moreover, VTG production by $E_2-primed$ hepatocytes was reduced by removing calcium from the incubation medium with or without $E_2$. These results suggest that the entry of extracellular calcium into the cytoplasm is an important step for VTG production in primary hepatocyte cultures in rainbow trout.

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Detection of Endocrine-Disrupting Chemicals in Fish and the Use of Fish Vitellogenin as a Biomarker (어류를 이용한 내분비계 장애물질 검출 및 Biomarker로서 Vitellogenin의 이용)

  • Yoon, Seok-Joo;Kim, Il-Chan;Yoon, Yong-Dal;Lee, Jae-Seong
    • Korean Journal of Ecology and Environment
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    • v.36 no.2 s.103
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    • pp.97-107
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    • 2003
  • Fish vitellogenin produces in female liver during oogensesis through estradiol cycle, and produces even in male liver by endocrine-disrupting chemicals (EDCs) such as alkylphenols. The resulting effects of EDCs lead to the low fecundity of female and the feminization (eg. shrinkage of testis) in male. Especially, the production of vitellogenin in male indicates the environmental contamination of EDCs, resulting in the modulation of gene expression profiles and the monitoring of environmental contamination at specific area. In this paper, we suggest that fish vitellogenin is useful for biomonitoring for environmental contamination and would be substantially useful as a biomarker for a detection of EDCs in aquatic environment.

Inhibitory Effects of Cu and Zn on Vitellogenin Production in hepatocytes Culture of the Rainbow Trout Oncorhynchus mykiss (무지개송어(Oncorhynchus mykiss) 배양 간세포에서 Vitellogenin 합성에 미치는 Cu 및 Zn의 억제 효과)

  • 여인규;붕교아기자;맥곡태웅
    • Journal of Aquaculture
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    • v.11 no.3
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    • pp.311-317
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    • 1998
  • Effects of Cu and Zn on estradiol-17$\beta$-Induced vitellogenin (VTG) production were electro-phoretically examined in hepatocyte cultures of rainbow trout. Hepatocytes were precultured for 2 days and then Cu ($10^{-5}$ ~$10^{-4}$M) and Zn ($10^{-5}$~$10^{-3}$M) were added to the incubation medium with estradiol-17${\beta}$ ($2{\times}10^{-6}$M). The hepatocytes were cultured for 5 more days. The relative VTG production rate was expressed as the percentage of VTG to total proteins including the VTG. The addition of CU and Zn to the incubation medium had no appreciable toxin effect on the viability of hepatocytes in the culture. However, Cu markedly reduced VTG production at any concentration used. Zn also specifically reduced VTG production by hepatocytes in a concentration dependent way and there was a significnt reduction at Zn concentrations of $10^{-3}$M. The reduction recovered by removing Zn from the media, but Cu did not. Additionally, enriched Ca concentrations (1.8 to 2.5 or 5.0 mM) in the incubation medium had no protective effect on the reduction of VTG production by Cu $10^{-4}$ M. These results suggest that the production of VTG is more susceptible to Cu and Zn than are other hepatocyte-derived proteins.

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Early gonadal maturation and vitellogenin mRNA expression in Siberian sturgeon Acipenser baerii cultured in a semi-closed water recirculating system in Korea

  • Park, Chulhong;Gong, Seung Pyo;Choi, Youn Hee;Kim, Ki Hong;Nam, Yoon Kwon
    • Journal of Animal Reproduction and Biotechnology
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    • v.35 no.3
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    • pp.279-288
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    • 2020
  • Changes of gonadal morphology and mRNA expression patterns of vitellogenin were investigated in Siberian sturgeon Acipenser baerii (Chondrostei) during its early gonadal maturation period. Early differentiations and morphological transitions of both ovaries and testes appeared to occur actively until the age of 3 years, however from then on, the maturation patterns to full maturity were largely gender-dependent, in which males showed a faster progression of maturation than did females while females experienced a steady-state progress with a lagged interval before entering the final maturation. Expression of vitellogenin mRNAs are closely correlated with transitional patterns of gonadal appearances. In both females and males, hepatic mRNA levels of vitellogenin exponentially increased in the earliest interval (up to 1-year-old). However, in subsequent periods, vitellogenin expression in females continued to increase with age, whereas in males, the expression stabilized at a younger age. Nevertheless, at the age older than or equal to 7-year-old, fully matured individuals showed a quite low level of vitellogenin expression in both females and males. Collectively, results from this study could be useful as a fundamental guideline to address the gonad maturation of this sturgeon species, which is helpful for making practical decisions about farming practices and management for caviar production on local sturgeon farms.