• 제목/요약/키워드: Estrogenic study

검색결과 159건 처리시간 0.023초

Induction of In Vitro Vitellogenin Synthesis by Bisphenol, Nonylphenol and Octylphenol in Chinese Minnow(Phoxinus oxycephalus) Hepatocytes

  • Park, Chang-Beom;Kim, Byung-Ho;Na, Oh-Soo;Choi, Young-Chan;Lee, Young-Don;Baek, Hae-Ja;Kim, Hyung-Bae;Akihiro Takemura
    • Animal cells and systems
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    • 제7권3호
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    • pp.227-235
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    • 2003
  • Bisphenol A (BPA), nonylphenol (NP), and 4-tert-octylphenol (OP) are known endocrine disrupting chemicals (EDCs) with estrogenic activity in fish. This study compared the effects of BPA, NP and OP on in vitro vitellogenin (VTG) synthesis in primary cultures of hepatocytes of the Chinese minnow Phoxinus oxycephalus. The VTG secreted into the culture medium was measured using enzyme-linked immunosorbent assay (ELISA), which we developed in this study using an antibody prepared from homogenates of Chinese minnow egg. VTG synthesis was induced by estradiol-17$\beta$ ($E_2$) and phenols (BPA, NP and OP) treatment. $E_2$ at concentrations of 10$^{-6}$ M or higher increased VTG levels significantly (P < 0.05). Exposure to 10^5\;M\;BPA\;or\;10^-4$M NP and OPinduced in vitro VTG synthesis (P < 0.01). However, $10^-3$ M BPA, NP or OP did not induce VTG synthesis. These results suggest that SPA has the highest estrogenic potential in Chinese minnow hepatocytes. Tamoxifen, an anti-estrogen, drastically blocked the production of VTG by phenols (BPA, NP and OP) suggesting that phenols (BPA, NP and OP) may act via binding to estrogen receptor (ER) in Chinese minnow hepatocytes.

E-screen assay 및 자궁비대반응시험 (Uterotrophic assay)을 이용한 di-(2-ethylhexyl) adipate의 에스트로겐성 작용에 관한 연구 (Study on the Estrogenic Activity of Di-(2-Ethylhexyl) Adipate in E-Screen Assay and Uterotrophic Assay)

  • 한순영;김형식;한상국;이이다;양규환;박귀례
    • 한국식품과학회지
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    • 제32권4호
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    • pp.964-969
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    • 2000
  • 랩 등 PVC 제품의 가소제인 DEHA의 에스트로겐 활성을 검색하기 위하여 내분비계 장애작용 중 에스트로겐성 작용을 검색하는 대표적인 방법인 in vitro E-screen assay와 OECD 및 미국 EPA EDSTAC에서 권고하고 있는 in vivo 난소절제 랫드를 이용한 자궁 비대반응시험(uterotrophic assay)을 실시하였다. 시험결과 $DEHA(5{\times}10^{-9}{\sim}5{\times}10^{-4}\;M)$는 MCF-7세포의 증식을 유발하지 않았고 난소절제 랫드에 200 mg/kg/day 용량까지 투여하여도 자궁 및 질 무게에 영향을 미치지 않았다. 따라서 본 실험결과 DEHA는 E-screen assay 및 자궁비대반응시험에서 에스트로겐성 작용이 없는 것으로 확인되었으나, 이들 물질의 에스트로겐성에 대한 결론을 내리기 위해서는 여러 종류의 in vitro 시험 data 및 in vivo 시험 data가 더 보충되어야 할 것으로 생각된다.

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Toxicogenomic Analysis and Identification of Estrogen Responsive Genes of Di (n-ethylhexyl) Phthalate in MCF-7 Cells

  • Kim, Youn-Jung;Yun, Hye-Jung;Ryu, Jae-Chun
    • Molecular & Cellular Toxicology
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    • 제1권3호
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    • pp.149-156
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    • 2005
  • Di (n-ethylhexyl) phthalate (DEHP) is thought to mimic estrogens in their action, and are called endocrine disrupting chemicals. DEHP is used in numerous consumer products, especially those made of flexible polyvinyl chloride and have been reported to be weakly estrogenic. In this study, DEHP were tested for estrogenic properties in vitro models and with microarray analysis. First, the E-screen assay was used to measure the proliferation of DEHP in MCF-7 cells, a human breast cancer cell line. DEHP induced an increase in MCF-7 cell proliferation at concentration of $10^{-4}M$. Second, we carried out a microarray analysis of MCF-7 cells treated with DEHP using human c-DNA microarray including 401 endocrine system related genes. Of the genes analyzed, 60 genes were identified showing significant changes in gene expression resulting from DEHP. Especially, 4 genes were repressed and 4 genes were induced by DEHP compared to $17{\beta}-estradiol$. Among these genes, trefoil factor 3 (intestinal), breast cancer 1, early onset and CYP1B1 are involved in estrogen metabolism and regulation. Therefore it suggests that these genes may be associated with estrogenic effect of the DEHP on transcriptional level. The rationale is that, as gene expression is a sensitive endpoint, alterations of these genes may act as useful biomarkers to define more precisely the nature and level of exposure to kinds of phthalates.

Estrogenic Xenobiotics가 돼지 정자의 운동성 및 운동역학에 미치는 영향 (Effect of Estrogenic Xonibiotics on Boar Sperm Motility and Motion Kinematics)

  • 오신애;박유진;송원희;;방명걸
    • Reproductive and Developmental Biology
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    • 제35권1호
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    • pp.47-54
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    • 2011
  • Endocrine disruptors bind to hormone receptors on sperm membrane, therefore spermatozoa are potentially a useful model for examining estrogenic activities of endocrine disruptors. The objective of this study was to compare the effects of two xenoestrogenic compounds [genistein (Gen) and 4-tert-octylphenol (OP)] to those of two steroids [estrogen ($E_2$) and progesterone ($P_4$)] on boar sperm % motility and motion kinematics of in vitro. Porcine spermatozoa were incubated with various concentrations ($0.001{\sim}100\;{\mu}M$) of each chemical for 15 or 30 min, and then assessed % motility and sperm motion kinematics using computer assisted sperm analyzer (CASA). Each chemical decreased sperm % motility, and OP decreased VSL and VAP compared with untreated control(p<0.05). $E_2$ stimulated the motion kinematic changes except VCL. Moreover, Gen had effects on VCL and VAP alterations after 30 min incubation. In summary, since all chemicals studied effectively altered sperm % motility and motion kinematics, it was concluded that porcine spermatozoa could be a useful model for in vitro screening of potential endocrine disruptors.

미성숙 랫드 자궁비대반응시험을 이용한 DEHA의 내분비계 장애작용 평가 (Immatured Type Uterotrophic Assay for Estrogenicity Evaluation of DEHA)

  • 박기대;한범석;정자영;오재호;조완섭;조민정;최미나;김성준;김승희
    • 한국환경보건학회지
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    • 제33권5호
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    • pp.379-385
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    • 2007
  • This study was aimed to investigate the estrogenic activity of Di-(2-ethylhexyl) adipate (DEHA) using immatured type uterotrophic assay. SD rats were treated with DEHA (40, 200, 1000mg/kg/day), estradiol-3-benzoate (EB) $(1{\mu}g/kg/day)$ as positive control on the assay. In immatured-type uterotrophic assay, relative organ weights of kidney and reproductive organs such as ovary at high-dose group were significantly increased compared to those of vehicle control group. DEHA did not influence the levels of serum FSH and LH, and uterine morphological changes such as luminal epithelial height, myometrial thickness and numbers of uterine gland, and BrdU indices. In these results, there was no significant variation by DEHA treatment, suggesting that DEHA appears not to be a endocrine disrupter with estrogenic activity.

Activation of Estrogen Receptor by Bavachin from Psoralea corylifolia

  • Park, Joon-Woo;Kim, Do-Hee;Ahn, Hye-Na;Song, Yun-Seon;Lee, Young-Joo;Ryu, Jae-Ha
    • Biomolecules & Therapeutics
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    • 제20권2호
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    • pp.183-188
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    • 2012
  • In this study, we examined the estrogenic activity of bavachin, a component of Psoralea corylifolia that has been used as a traditional medicine in Asia. Bavachin was purified from ethanolic extract of Psoralea corylifolia and characterized its estrogenic activity by ligand binding, reporter gene activation, and endogenous estrogen receptor (ER) target gene regulation. Bavachin showed ER ligand binding activity in competitive displacement of [$^3H$] $E_2$ from recombinant ER. The estrogenic activity of bavachin was characterized in a transient transfection system using $ER{\alpha}$ or $ER{\beta}$ and estrogen-responsive luciferase plasmids in CV-1 cells with an $EC_{50}$ of 320 nM and 680 nM, respectively. Bavachin increased the mRNA levels of estrogen-responsive genes such as pS2 and PR, and decreased the protein level of $ER{\alpha}$ by proteasomal pathway. However, bavachin failed to activate the androgen receptor in CV-1 cells transiently transfected with the corresponding receptor and hormone responsive reporter plasmid. These data indicate that bavachin acts as a weak phytoestrogen by binding and activating the ER.

Estrogen Receptor Is Activated by Korean Red Ginseng In Vitro but Not In Vivo

  • Shim, Myeong-Kuk;Lee, Young-Joo
    • Journal of Ginseng Research
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    • 제36권2호
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    • pp.169-175
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    • 2012
  • Ginseng has been used as a traditional medicine for treatment of many diseases and for general health maintenance in people of all ages. Ginseng is also used to ameliorate menopausal systems. We investigated the estrogenic activity of Korean red ginseng (KRG) in a transient transfection system, using estrogen receptor (ER) and estrogen-responsive luciferase plasmids in MCF-7 cells. The extract activated both ER${\alpha}$ and ER${\beta}$. KRG modulated the mRNA levels of estrogen-responsive genes such as pS2 and ESR1 and decreased the protein level of ER${\alpha}$. In order to examine in vivo estrogenic activity of KRG, sixteen female Sprague-Dawley rats separated into four groups were studied for nine weeks: non-ovariectomized (OVX) rats treated with olive oil, OVX rats treated with olive oil, OVX rats treated with 17-${\beta}$-estradiol (E2) in olive oil, and OVX rats treated with KRG extract in olive oil. The experiments were repeated for three times and the data of twelve rats were combined. Body weight of OVX rats was greater than that of sham-operated control rats and was decreased by E2 treatment. Uterine weight increased after E2 treatment compared to OVX rats. However, no difference in body or uterine weight was observed with KRG intake. KRG induced reductions in total cholesterol, low density lipoprotein cholesterol/total cholesterol, high density lipoprotein cholesterol/total cholesterol, and low density lipoprotein cholesterol/high density lipoprotein cholesterol, but not to the same degree as did E2 intake. These results show that KRG does contain estrogenic activity as manifested by in vitro study but the activity is not strong enough to elicit physiological responses.

바위수염 추출물의 파골세포 분화 억제 및 에스트라디올 활성 평가 (Inhibitory Effect of Osteoclastogenesis and Estradiol Activity of Myelophycus simplex Extract)

  • 하현주;임형진;김민경;박선경;노문철;정선희;이승재;이상훈
    • 한국해양바이오학회지
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    • 제12권2호
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    • pp.75-80
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    • 2020
  • In the present study, the estrogenic activity and anti-osteoclastogenic activity of the Myelophycus simplex extract were evaluated using T47D-Kbluc cells and bone marrow-derived macrophages (BMMs). As a result of the measurement of the estrogenic activity in the T47D-Kbluc cell line, the Myelophycus simplex extract showed increased estrogenic activity in a dose-dependent manner in association with its concentration. To confirm the regulatory effect of the Myelophycus simplex extract on the estrogen-responsive gene, the Myelophycus simplex extract showed a similar tendency to estradiol: the expression of estrogen receptor 1 (ESR1) was significantly decreased while the expression of estrogen receptor 2 (ESR2) was increased. Furthermore, the Myelophycus simplex extract exhibited an inhibitory effect on osteoclast differentiation. In conclusion, these Myelophycus simplex extracts might be regarded as candidates for further studies or the development of functional food products or medicine to prevent or avoid postmenopausal symptoms for women.

내분비계 장애추정농약에 대한 에스트로겐성 영향검색 및 위해성 평가 (Risk assessment for estrogenic effect of the suspected endocrine disrupting pesticides)

  • 이제봉;신진섭;이희동;정미혜;유아선;강규영
    • 농약과학회지
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    • 제8권2호
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    • pp.95-102
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    • 2004
  • 현재 국내 사용중이며 내분비계 장애추정농약으로 분류된 benomyl, carbaryl, endosulfan등 17종 농약에 대한 estrogen성 영향을 검색하기 위하여 인체난소암세포(BG1Luc4E2)를 이용한 luciferase assay를 수행하였으며, luciferase assay에서 Eeq를 산출한 후 내분비계 장애추정 농약의 에스트로겐성 영향에 대한 식이섭취 위험도 평가를 실시하였다. Estrogen 수용체 결합시험에서 cypermethrin, dicofol, endosulfan, esfenvalerate 및 fenvalerate가 $10^{-5}$ M에서 최고 영향이 관찰되었고, mancozeb 등 8종 농약은 약한 영향이 관찰되었으며, benomyl 등 나머지 4종 농약은 영향이 없었다. 이들 중 활성이 비교적 강한 dicofol 및 endoeulfan의 1 nmol 17 $\beta$-estradiol에 대한 RLP 와 RLU는 dicofol의 경우 $10^{-5}$ 및 56%이었구, endosulfan은 $10^{-5}$ 및 72%이었다. MRL을 이용한 식이섭취 위험도 평가 결과 농약들의 추청 1일 최대농약섭취량은 cypermethrin 0.667, dicofol 0.1462, endosulfan 0.2066 및 lenvalerate/esfenvalerate 0.2098 mg/person으로 총 추정 1일 최대 농약섭취량이 1.2298 mg/person이었고, 남성 혈중 에스트로겐 증가 농도는 3.075 ng/L로 정상농도에 비해 15%정도 증가하였으나, 국내 모니터링 성적을 기준으로 평가한 결과 남성혈중 에스트로겐 증가 농도는 0.01938 ng/L로 정상농도에 비해 0.09693%정도 증가하였다.