• 한국임상수의학회지
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• 제18권4호
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• pp.474-478
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• 2001

A female mixed miniature pinscher dog, about 5 years old, 4 kg, was referred to veterinary teaching hospital of Chungnam National University with chief complaint of excessive hemorrhagic vaginal discharge for a month, partial alopecia and hyperpigmentation. There are no specific change with CBC, blood chemistry and X-ray findings but we figured out high estrogen concentration with hormone analysis and detected a majority of the superficial epithelial cells with pyknotic nuclei by cytologic examination of vaginal smear preparation and multiple ovarian cysts on both ovaries by ultrasonography. Based on the clinical signs, hormone analysis, vaginal smear preparation and ultrasonography, the authors diagnosed this case as hyperestrogenism with ovarian cysts.

• 한국동물학회지
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• 제37권3호
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• pp.377-384
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• 1994

The present study examines the inhibitow effect of progesterone (P) on luteinizing hormone $(LH)\beta$ subunit gene expression in anterior pituitary of ovariectomized, estradiol-treated adult rats. A single injection of P (1mg) further decreased the estradiol-Induced decrease in $LH\beta$ mRNA levels in ovariectomTzed rats in a time-dependent manner. p suppressed UIP mRNA levels at lower doses (0.1 and 1mg), but increased $LH\beta$ mRNA levels 81 a high dose (toms). The inhibitor action of P on $Uf\beta$ mRNA was restored when Ru486, a P receptor antagonist, was administered 1h before P treatment. These data clearly indicate that P inhibits gene expression of $LH\beta$ in the rift pituitary in a swersic manner with estrogen.

• Biomolecules & Therapeutics
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• 제9권2호
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• pp.119-124
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• 2001

In order to determine the role of dehydroepiandrosterone (DHEA), the important sex-steroid hormone precursor, in vascular reactivity in rats, animals were treated for two weeks with DHEA or sex hormones, and the vascorelaxant and contractile responses of isolated aorta were examined. DHEA diminished the acetylcholine (ACh)-induced relaxation in female rats, while the drug was without effect in males. Testoterone lowered the vasorelaxant activity to ACh in either sex. 17$\beta$-Estradiol enhanced ACh-induced vasorelaxation in male rats, but this female sex hormone did not influence in females. In male rats, the androgen receptor antagonist flutamide also enhanced vasorelaxant action of ACh. When the male rat aorta was incubated in vitro with a nitric oxide (NO) synthase inhibitor L-NAME, phenylephrine-induced contraction was greatly potentiated in DHEA-pretreated rats compared to control ones. The present results suggest that DHEA stimulates mainly androgen in female, but both androgen and estrogen in male rats. The participation of NO In the modulation of vascular reactivity with pretreated DHEA was also considered.

• 수면정신생리
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• 제9권2호
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• pp.96-99
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• 2002

Menopause, the cessation of menstruation caused by the decline in estrogen production, occurs in 95% of women between 40 and 60 years. Sleep disturbance is a frequent complaint during the perimenopause period. In contrast to premenopausla women, menopausal women experience more reduction in the total sleep hours and report more sleep disturbances, such as insomnia, noctiria and sleep disordered breathing. But the prevalence, etiology and treatment of sleep disturbances in menopause are still controversal. So further investigations are required to elucidate the factors that account for the differences in sleep disturbance between premenopausal and postmenopausal women. There are suggestive data that estrogen and progesterone deficiency may increase the susceptibility for sleep disorder in menopause. Furthermore, there are suggestive evidence from observational studies and a limited number of randomized, controlled trials that hormone replacement therapy after menopause improves sleep. However, the clinical relevance of hormone replacement therapy is unproved. So the overall benefit of hormonal replacement in postmenopausal women with sleep related disorders should be individualized to avoid potential side effects. Several studies evaluated the role of melatonin, because this hormone has effects on core body temperature & insomnia. But the exact dosage and the effects of long-term use of melatonin are unclear. So, caution is indicated in melatonin administration.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.131.1-131.1
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• 2003

Phytoestrogens are naturally occurring compounds derived from plants. Structurally, some phytoestrogens resemble endogenous estrogen of humans and animals. Phytoestrogens exhibit estrogen agonist/antagonist properties and have many biological effects such as prevention of hormone-dependent breast cancer, anti-oxidative activity, inhibition of tyrosine kinase activities and inhibition of angiogenesis. In this study we investigated whether biochanin A, a phytoestrogen, and its metabolites such genistein, p-ethylphenol and phenolic aic affect IL-4 production in EL-4 thymoma cell-line and primary lymph node cells. (omitted)

• The Korean Journal of Physiology and Pharmacology
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• 제10권3호
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• pp.123-129
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• 2006

In several experimental models, estrogens protect neurons against ischemic insults. However, the recent clinical studies of hormone replacement showed negative results to prevent stroke. Therefore, optimal models to study estrogen replacement for neuroprotection are needed before its clinical ap-plication. Organotypic hippocampal slice under oxygen-glucose deprivation (OGD) has been established as a model of cerebral ischemia and has advantages to study drug effects. We investigated whether estrogen protected CAI neurons and affected activation of Akt (pAkt) in CAI region under OGD. Thus, rat hippocampal slices on day 7 of culture were treated with $17-{\beta}$ estradiol (E, 1 nM) for 7 days before 30 min OGD, and cell death of CAI neurons was quantified by propidium iodide (PI) staining and expression of pAkt was studied by Western blot and immunofluorescence. PI intensity in slices treated with E was significantly reduced 72 hour after OGD compared to that of non-treated slices (p < 0.05). E pretreatment also increased the expression of pAkt 72 hour after OGD compared to that of no treatment (p<0.01). These data suggest that estrogen pretreatment may rescue neurons from ischemic insults through the activation of Akt and also indicate that our model would be a useful alternative method to study the mechanisms and effects of estrogen replacement treatment for neuroprotection.

• 한국수정란이식학회지
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• 제23권1호
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• pp.59-64
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• 2008

The objective of this study is to investigate the changes in concentrations of blood urea nitrogen (BUN) and sex steroid hormones, such as estrogen, progesterone, and testosterone in Korean cattle (Hanwoo) with reproductive disorders and to examine the relationship between BUN and body condition score (BCS) in Hanwoo. The concentration of BUN was 16.2 mg/dl, 17.8 mg/dl, 15.1 mg/dl, 17.9 mg/dl, and 28.3mg/dl in pregnancy, repeat breeding, follicular cyst, luteal cyst, and ovarian atrophy, respectively. In Hanwoo with BCS $2.0{\sim}2.9$, $3.0{\sim}3.5$ and $3.6{\sim}4.0$, the concentration of BUN was 15.8 mg/dl, 17.0 mg/dl, and 17.6 mg/dl, respectively. Fluoroimmunoassay showed that serum estrogen and progesterone levels were decreased in reproductive disorders Hanwoo, such as ovarian atrophy, endometritis, and weak estrus. The testosterone level was significantly decreased in Hanwoo with reproductive disorders compared to that in pregnant Hanwoo ($0.02{\sim}0.03\;ng/ml$ vs 0.13 ng/ml, p<0.05). The progesterone and estrogen concentrations in follicular fluid obtained from ovary with follicular cyst were significantly higher (p<0.05) than those in normal follicle fluid. These results show that there is no relationship between BUN and BCS in Hanwoo, and the concentration of sex steroid hormone in serum and follicular fluid are changed in reproductive disorders Hanwoo.

• Clinical and Experimental Reproductive Medicine
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• 제37권2호
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• pp.89-98
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• 2010

성호르몬은 lacrimal system, corneal anatomy and disease, aqueous humor dynamics and glaucoma, crystalline lens and cataract, retinal disease를 포함한 안과영역의 다양한 부위에 영향을 끼칠 수 있다. Androgen은 전신에 걸친 sebaceous glands의 발달, 분화, 지질생성 등에 관여하므로 androgen deficiency는 meibomian gland의 기능장애와 건성안에서 증발을 더욱더 심화시킬 수 있는 것으로 알려져 있다. 반면에 estrogens은 sebaceous glands의 크기, activity, 지질생성을 감소시켜 meibomian gland에서는 androgen과 반대되는 작용을 할 가능성이 있다. 성호르몬은 또한 각막의 구조와 질병경과에도 영향을 줄 수 있는데, 각막이 월경주기 제2일째 및 배란주위기에 두꺼워지며, 폐경 여성에서 여성호르몬 치료 시 각막두께가 증가한다는 사실은 estrogen levels과 각막 두께와의 연관을 시사하는 소견이라고 하겠다. Fuch's dystrophy 역시 폐경 후 여성에서 더 흔히 관찰되어, 나이에 따른 호르몬 변화가 그 원인 중 하나로 지목되고 있으며, vernal keratoconjunctivitis 환자의 각막조직에서는 estrogen과 progesterone 수용체의 overexpresson이 발견되어 역시 이들 질환에서의 성호르몬의 역할을 시사한다고 할 수 있겠다. 성호르몬은 안압에도 영향을 미칠 수 있는데, intraocular pressure와 혈중 luteinizing hormone, follicular stimulating hormone (FSH), estrone, estradiol, progesterone, testosterone과는 연관이 없는 것으로 보고한 결과도 있으나, 혈중 progesterone의 경우 특히 임신중인 여성에서 안압과의 연관관계가 보고되었으며, 또한 폐경 여성에서 혈중 남성호르몬 농도가 높을수록 안압이 상승하는 경향이 있음이 보고되었다. 한편 'Female sex'는 모든 종류의 백내장의 위험요소인 것으로 알려져 있다. 백내장으로 진단받은 여성의 경우 호르몬 측정 시 연령등을 보정하고도 폐경기에 가까운 호르몬 수치를 보였으며, 이들 백내장 환자군내에서는 estradiol과 FSH 농도 사이에 유의한 음의 상관관계가 보고되었다. 또한 DHEAS의 경우 백내장 위험도를 감소시키는 것으로 보고되었고, 그 기전으로 전구호르몬인 DHEA의 역할을 제시되고 있는데. 즉 백내장의 주요 기전 중 하나인 oxidative stress를 감소시키는 antioxidant activity를 DHEA가 보이기 때문일 것으로 추정되고 있다. 성호르몬은 망막 내 혈관의 흐름에도 영향을 줄 수 있는 것으로 알려져 있는데, 안구 내 혈류에서 여성호르몬의 긍정적인 효과와 남성호르몬의 부정적인 효과가 보고되었고, age-related macular degeneration (AMD)의 경우, estradiol이 ER-$\beta$ 수용체를 통해 보호효과가 있음이 보고되어, ER-$\beta$ 수용체가 향후 AMD 치료에서 치료적 target이 될 수도 있을 것으로 알려지고 있다. 또한 DHEAS의 경우 AMD 위험도를 증가시킬 가능성이 있으며, 당뇨로 진단받은 환자에서는 혈중 testosterone 농도는 당뇨병성 망막병증의 진행과 연관이 있는 것으로 보고되었다. 성호르몬은 안과영역의 다양한 질환과의 연관관계는 아직 추가연구가 필요한 실정이나 다양한 성호르몬이 안질환의 발생 및 경과에 영향을 줄 가능성이 있으며, 이와 같은 연관관계가 규명된다면 추후 호르몬을 통해 질환의 경과 및 예방의 가능성이 제시될 수도 있을 것으로 사료된다. 특히 폐경이후 다양한 안질환이 증가한다는 기존의 연구결과들을 고려 시, 안과영역에 있어 폐경기 여성호르몬 치료의 긍정적인 역할에 관해서는 지속적인 관심이 요구된다고 하겠다.

• 생명과학회지
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• 제28권7호
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• pp.874-883
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• 2018

전 세계적인 인구 고령화 현상으로 인하여 골다공증은 주요한 질병으로 대두되고 있다. 골다공증은 뼈의 질량과 강도가 감소하여 골절의 위험이 증가하는 질환으로 조골세포의 골 형성 및 파골세포의 골 흡수의 불균형으로 인해 발생하는 질환이다. 조골세포에 의한 골 형성은 BMP, RUNX2, $Wnt/{\beta}-catenin$ 경로 등을 통하여 활성화 되며, 파골세포에 의한 골 흡수는 RANKL과 RANK의 결합에 의해서 시작된다. 폐경기 여성은 호르몬 불균형에 의해 여러 질병의 위험에 처해 있으며, 폐경기 여성의 약 30%에서 관찰되는 골다공증은 폐경기 여성에게서 발생되는 가장 흔한 대사성 질환이기도 하다. Estrogen이 부족할 때 파골세포의 골 흡수가 촉진되므로, 특히 폐경 여성에서 골다공증의 발생위험이 증가하게 된다. 호르몬대체요법은 폐경기 증후군의 증상을 경감시키거나 치료하기 위해 널리 사용되어 왔으나, 호르몬 치료를 장기간 실시할 경우 유방암, 난소암, 자궁암 등의 부작용 위험성이 매우 높은 것으로 알려져 있다. 따라서 최근 들어 여러 부작용을 보완하기 위해 폐경기 증후군 증상에 대처할 수 있는 estrogen과 유사한 활성을 지닌 식물성 estrogen인 phytoestrogen에 대한 연구가 활발히 진행되고 있다. 따라서, 본 총설에서는 조골세포 및 파골세포의 분화 기전에 대한 선행연구를 알아보고 골 대사에서의 estrogen의 역할 및 phytoestrogen과 관련한 연구들에 대해서도 살펴보았다.

• 농업과학연구
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• 제37권3호
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• pp.393-398
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• 2010

Early pregnancy diagnosis of bovine is an essential component for efficient reproductive plan in farms because long term of non-pregnancy results in economic losses by failure of offspring production and low milk yield in dairy cattle. The major steroid hormones related with reproduction are known to be progesterone and estrogen in bovine pregnancy. To evaluate detection level of hormones in milk, plasma and milk progestrone and estrogen of Holstein cows was analyzed during artificial insemination (AI) and embryo transfer (ET). Progesterone concentration at 21 days postestrus was significantly different in plasma and milk between pregnant and non-pregnant cows. Estrogen concentration at estrus was higher in pregnant recipients than that in non-pregnant recipients. To analyze correlation between hormone levels and conception rates in Holstein, the conception and return rates were checked following AI, and the returned cows were on the track of pregnancy after consecutive AI. Pregnant cows following first AI were considered as high conception group while pregnant cows following third AI were rated as low conception group. Proportion of high and low conception groups in this study was 78.2% and 9.1%, respectively. Hormone analysis indicated that high conception group had higher estrogen level during estrus than low conception group ($26.45{\pm}3.32$ vs $19.017{\pm}2.97$). Progesterone level was not different between high and low conception groups during estrus but increased significantly after 21 days postestrus (21 day: $4.95{\pm}1.12$ vs $0.95{\pm}0.23$, 35 day: $12.47{\pm}3.82$ vs $2.41{\pm}1.21$). In conclusion, the pattern of progesterone and estrogen secretion in Holstein milk samples could be a good candidate for early pregnancy detection and selection of recipients during ET.