• 제목/요약/키워드: aromatase

검색결과 95건 처리시간 0.026초

환경생물에 대한 내분비교란물질 의심 농약의 영향 (Effects on EDC-like farming chemicals in aquatic Organism)

  • 김현우;박건호;박진홍;김화;김준성;유국종;조현선;강가미;이명성;송병훈;신진섭;조명행
    • 농약과학회지
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    • 제7권3호
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    • pp.188-197
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    • 2003
  • 내분비교란물질은 동물에서 생식기계통을 통제하는 호르몬 조절에 영향을 준다. 상기 선정된 농약을 투여함에 있어서 실험동물로 Xiphophorus helleri로 선정하였는데 이는 암수의 구별이 육안적으로 명확히 관찰되며 또한 난태생으로 사육이 용이한 점이 있다. Xiphophorus helleri에 있어서 내분비교란물질로 의심되는 endosulfan과 molinate의 영향을 조사하기 위하여 vitellogenin과 aromatase 를 진단 biomarker로써 사용하였다. RT-PCR 결과 endosulfan과 molinate의 혼합처치군 및 alachlor 단독군 수컷에서 vitellogenin과 aromatase의 induction 이 동시에 관찰되었고, endosulfan 단독군에서는 aromatase의 induction이 관찰되었다. 본 실험에서는 endosulfan이나 molinate 단독 처치군에서의 성호르몬과 세포에 대한 유해 효과는 나타나지 않았다. 그러나, endosulfan과 molinate 의 혼합처치군에서는 vitellogenin과 aromatase의 발현 및 apoptosis가 관찰되었다. 이러한 결과는 swordtail fish에 영향을 미치지 않는 낮은 농도의 molinate와 endosulfan이라도 병용되는 경우에 생식기계의 호르몬 변화와 apoptosis를 야기시킨다는 사실을 제시한다.

The effects of the standardized extracts of Ginkgo biloba on steroidogenesis pathways and aromatase activity in H295R human adrenocortical carcinoma cells

  • Kim, Mijie;Park, Yong Joo;Ahn, Huiyeon;Moon, Byeonghak;Chung, Kyu Hyuck;Oh, Seung Min
    • Environmental Analysis Health and Toxicology
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    • 제31권
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    • pp.10.1-10.8
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    • 2016
  • Objectives Aromatase inhibitors that block estrogen synthesis are a proven first-line hormonal therapy for postmenopausal breast cancer. Although it is known that standardized extract of Ginkgo biloba (EGb761) induces anti-carcinogenic effects like the aromatase inhibitors, the effects of EGb761 on steroidogenesis have not been studied yet. Therefore, the effects of EGb761 on steroidogenesis and aromatase activity was studied using a H295R cell model, which was a good in vitro model to predict effects on human adrenal steroidogenesis. Methods Cortisol, aldosterone, testosterone, and $17{\beta}$-estradiol were evaluated in the H295R cells by competitive enzyme-linked immunospecific assay after exposure to EGb761. Real-time polymerase chain reaction were performed to evaluate effects on critical genes in steroid hormone production, specifically cytochrome P450 (CYP11/ 17/19/21) and the hydroxysteroid dehydrogenases ($3{\beta}$-HSD2 and $17{\beta}$-HSD1/4). Finally, aromatase activities were measured with a tritiated water-release assay and by western blotting analysis. Results H295R cells exposed to EGb761 (10 and $100{\mu}g/mL$) showed a significant decrease in $17{\beta}$-estradiol and testosterone, but no change in aldosterone or cortisol. Genes (CYP19 and $17{\beta}$-HSD1) related to the estrogen steroidogenesis were significantly decreased by EGb761. EGb761 treatment of H295R cells resulted in a significant decrease of aromatase activity as measured by the direct and indirect assays. The coding sequence/Exon PII of CYP19 gene transcript and protein level of CYP19 were significantly decreased by EGb761. Conclusions These results suggest that EGb761 could regulate steroidogenesis-related genes such as CYP19 and $17{\beta}$-HSD1, and lead to a decrease in $17{\beta}$-estradiol and testosterone. The present study provides good information on potential therapeutic effects of EGb761 on estrogen dependent breast cancer.

불임남성에서 방향화효소 억제제의 치료 효과 (The Effectiveness of Aromatase Inhibitor in Infertile Male)

  • 이재석;한거름;박용석;서주태
    • Clinical and Experimental Reproductive Medicine
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    • 제30권2호
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    • pp.135-139
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    • 2003
  • Objective: We investigated whether serum testosterone to estradiol ratio was decreased in infertile men and whether this condition can be corrected with oral aromatase inhibitor. Method: The serum testosterone to estradiol ratio of 26 men with testicular failure were compared with those of normal semen analysis parameter, 89 control reference group. All of 26 testicular failure group were diagnosed with the previous testicular biopsy. Then 46 men with oligospermia and/or asthenospermia were selected and treated with 1 mg of the aromatase inhibitor anastrozole ($Arimidex^{(R)}$) orally once daily for 3 months. Testosterone to estradiol ratio and semen analyses were evaluated during anastrozole therapy. Results: The testosterone level of testicular failure group was significantly lower and the testosterone to estradiol ratio was more decreased than normal semen parameter group. Forty six on-anastrozole group had significantly lower testosterone (4.6 versus 5.7 ng/ml, p<0.01) and higher estradiol (15.9 versus 23.4 pg/ml, p<0.01) than pre-anastrozole group, resulting in a decreased testosterone to estradiol ratio ($0.21{\pm}0.07$ versus $0.39{\pm}0.15$, p<0.01). Semen analyses before and during anastrozole treatment revealed significant increases in sperm count (35.5 versus 52.2 million sperm per ml, p<0.01) and motility (22.9% versus 29.3%, p<0.01). Conclusions: We identified infertile men with testicular failure had hormonal changes characterized by a decreased serum testosterone to estradiol ratio. The ratio can be corrected with aromatase inhibitor, resulting in a significant improvement in semen parameters.

지방세포 분화중인 3T3-L1 세포에서 아로마테이즈 siRNA 처리에 의한 지방관련 유전자와 전사인자의 발현 조절 (Adipocyte-Related Genes and Transcription Factors were Affected by siRNA for Aromatase Gene during 3T3-L1 Differentiation)

  • 정동기
    • 생명과학회지
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    • 제18권11호
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    • pp.1600-1605
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    • 2008
  • 본 연구는 에스트로겐 생성효소 유전자인 아로마테이즈 유전자의 siRNA를 이용하여 지방전구세포인 3T3-L1 세포의 지방세포 분화 시 나타나는 유전자의 발현을 검증하기 위하여 수행하였다. 먼저, CYP19A1 (aromatase)의 유전자로부터 siRNA를 3쌍을 디자인하고 이를 지방세포의 전구세포인 3T3-L1세포에 유전자 전이 한 후 분화 유도를 통하여 지방세포 생성의 메커니즘을 분석하였다. 결과적으로 비만의 원인 유전자인 렙틴 유전자의 발현 억제를 유도할 수 있었으며 특이적으로 인슐린과의 연관성이 매우 높음을 밝혀 낼 수 있었다. 그리고 비만 또는 백색지방 생성 시 발현이 억제되는 adiponectin과 adipsin의 과발현을 관찰할 수 있었다. 이 결과를 통하여 지방생성의 모든 신호전달체계 중 특정 한 물질을 저해 하므로써 큰 부작용 없이 비만의 문제가 되는 지방생성을 일정 정도 제어 할 수 있음을 확인 할 수 있었다. 그러므로 이 결과는 앞으로 에스트로겐 결핍 또는 과발현에 의하여 문제가 되는 지방생성 메커니즘을 밝히는 연구에 중요한 단서가 될 것으로 기대된다.

Peroxisome proliferator-activated receptor ${\gamma}$ agonist suppresses human telomerase reverse transcriptase expression and aromatase activity in eutopic endometrial stromal cells from endometriosis

  • Chang, Hye Jin;Lee, Jae Hoon;Hwang, Kyung Joo;Kim, Mi Ran;Yoo, Jung Hyun
    • Clinical and Experimental Reproductive Medicine
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    • 제40권2호
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    • pp.67-75
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    • 2013
  • Objective: To investigate the effect of peroxisome proliferator activated receptor ${\gamma}$(PPAR${\gamma}$) agonist on the cell proliferation properties and expression of human telomerase reverse transcriptase (hTERT) and aromatase in cultured endometrial stromal cell (ESC) from patients with endometriosis. Methods: Human endometrial tissues were obtained from women with endometriosis and healthy women (controls) using endometrial biopsy. Isolated ESCs were cultured and the cell proliferation was measured by 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assay and expression of hTERT, aromatase, and cyclooxygenase (COX)-2 by western blotting according to the addition of rosiglitazone (PPAR${\gamma}$ agonist). Results: We demonstrate that the cultured ESCs of endometriosis showed hTERT protein overexpression and increased cellular proliferation, which was inhibited by rosiglitazone, in a dose-dependent manner. At the same time, PPAR${\gamma}$ agonist also inhibited aromatase and COX-2 expression, resulting in decreased prostaglandin $E_2$ production in the ESCs of endometriosis. Conclusion: This study suggests that PPAR${\gamma}$ agonist plays an inhibitory role in the proliferative properties of eutopic endometrium with endometriosis by down-regulation of hTERT and COX-2 expression; this could be a new treatment target for endometriosis.

Aromatase Inhibitors from Isodon excisus var. coreanus

  • Jeong, Hyeh-Jean;Chang, Leng-Chee;Kim, Ho-Kyoung;Kim, Il-Hyuk;A.Douglas Kinghorn;John M.Pezzuto
    • Archives of Pharmacal Research
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    • 제23권3호
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    • pp.243-245
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    • 2000
  • The diethyl ether extract of isodon excisus var. coreanus exhibited significant inhibitory activity in aromatase assay. Bioactivity-guided fractionation of the extract led to the isolation of three active compounds: inflexin(ent-1${\alpha}$-hydroxy-3${\beta}$,6a-diacetoxykau r-16-en-11,15-dione) (1), ursolic acid (2), and ursolic acid 3-O-acetate (3).

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별불가사리 단백추출물이 유방암예방 및 전이억제 효소계에 미치는 영향 (Effect of Asterina pectinifera on Activities of Breast Cancer Chemopreventive and Metastatic Enzymes)

  • 남경수;김미경;조현정;손윤희
    • 한국해양바이오학회지
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    • 제1권3호
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    • pp.193-197
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    • 2006
  • 별불가사리 단백추출물을 조제하여 유방암 발생 및 전이억제효과를 측정한 결과 종양세포증식에 관여하는 aromatase 활성이 농도의존적으로 억제효과가 있었으며, 침윤성 유방암에서 과발현하는 COX-2 단백질 발현을 억제하였다. 그리고 유방암이 진행될수록 활성이 증가하는 MMP-9도 농도의존적 저해율을 보였다. 그러므로 별불가사리 단백추출물은 유방암억제기전에 관련된 더 많은 연구를 통하여 유방암 예방물질로서 개발 가능성이 있는 것으로 보인다.

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단삼 에탄올추출물이 유방암 예방 및 전이에 미치는 영향 (Effect of Ethanol Extract from Salvia miltiorrhiza on Chemoprevention and Metastasis of Breast Cancer)

  • 손윤희;조현정;김미경;정은정;남경수
    • 생약학회지
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    • 제38권1호
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    • pp.62-66
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    • 2007
  • Ethanol extract from Salvia miltiorrhiza (SME) was tested for breast cancer chemoprevention and metastasis by measuring the activites of cytochrome P45O 1A1, aromatase, ornithine decarboxylase (ODC), and matrix metalloproteinase (MMP)-9. SME significantly inhibited cytochrome P45O 1A1-mediated ethoxyresorufin O-deethylase (EROD) activity in a dose-dependent manner in a concentration range of 100${\sim}$l,200 ${\mu}g/ml$ (p<0.01). Microsomal aromatase (estrogen synthase) activity was suppressed 54.9%${\sim}$77.5% by the SME at concentration of 600${\sim}$l,200 ${\mu}g/ml$. ODC activity induced by 12-O-tet-radecanoylphorbol-13-acetate (TPA) was significantly reduced by the SME 900 and 1,200 ${\mu}g/ml$ (p<0.05) in MCF-7 breast cancer cells. In addition, SME (900 and 1,200 ${\mu}g/ml$) markedly inhibited MMP-9 activity, a key role in cancer metastasis. Therefore, SME is worth further investigation with respect to breast cancer chemoprevention or therapy.

Genistein이 유방암예방 활성에 미치는 영향 (Effect of Genistein on Chemopreventive Activity of Human Brest Cancer)

  • 손윤희;김호창;남경수
    • 동의생리병리학회지
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    • 제20권1호
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    • pp.88-92
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    • 2006
  • Genistein was tested for chemopreventive potential against breast cancer by measuring the effect on proliferation of human breast cancer cells, human placental aromatase activity and cyclooxygenases-2 (COX-2) expression and activity, Genistein inhibited the growth of estrogen-independent MDA-MB-231 human breast cancer cell. However, there is no inhibitory effect of genistein on human placental aromatase activity. The expression of COX-2 was inhibited by genistein in Western blot analysis. Genistein significantly inhibited COX-2 activity at the concentrations of 10 (p<0.05), 25 (p<0.05) and 50 ${\mu}M$ (p<0.01). These results suggest that genistein may have breast cancer chemopreventive potential by inhibiting the growth of human breast cancer cell and expression and activity of COX-2.