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퇴계학간(退溪學間)의 방법론(方法論)
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SnO2 Hollow Hemisphere Array for Methane Gas Sensing
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화학자의 정보요구와 이용행태 연구 : 부산대학교를 사례로 = (A) study on the information need and use behavior of chemist : the cases of Pusan national university
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BD/DVD/CD 대응 드라이브를 위한 고감도 10L 엑츄에이터
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무선 센서네트워크에서 노드 정보 테이블을 이용한 자가구성 라우팅 알고리즘
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느낌^ 어쩐지 크리스탈
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- 저자 : 장영건(Young Kwon Chang) (검색결과 3 건)
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태아발육지연 임신에서 산소농도가 영양배엽세포의 telomerase 활성도에 미치는 영향
정영내(Young Nae Jung),김세광(Sei Kwang Kim),정현철(Hyun Cheol Chung),박규현(Kyu Hyun Park),김창한(Chang Han Kim),장영건(Young Kwon Chang),권자영(Ja Young Kwon),김성훈(Sung Hun Kim),노성일(Sung Il Roh),조동제(Dong Jae Cho) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.8
N/A Objective : To observe the difference in telomerase activity (TA) expression in the placenta between fetal growth restriction (FGR) with preeclampsia and those without and to evaluate the effect of oxygen concentration on the TA expression in the trophoblastic cells. Methods : Telomerase activity was measured in 48 (normal pregnancies, 16; preeclampsia with FGR, 15; normotensive FGR, 17) placentas which were obtained between 32 and 41 weeks' gestations. Trophoblastic cells were extracted from 8 chorionic villi samples obtained from 8-10 weeks' placenta and were cultured in either 2%, 8%, and 20% oxygen atmosphere. Then TA was examined by using telomeric repeat amplification protocol (TRAP) assay. Results : During 3rd trimester of pregnancy, exhibited TA expression in normal pregnancy, FGR complicated by preeclampsia, and normotensive FGR groups were 11 of 16 (68.8%), 4 of 15 (26.7%), and 4 of 17 (23.5%), respectively. Significantly lower level of TA was detected in the FGR group compared to the normal pregnancies (p=0.009), whereas within FGR pregnancies, presence of preeclampsia did not seem to have statistically significant effect on TA expression. TA expression levels were measured by optical density in trophoblasts cultured under various oxygen concentration which revealed that significantly higher TA was exhibited in the cells cultured in 2% oxygen compared to 8% and 20% (p<0.001). However no significant difference was noted in TA between cells cultured in 8% and 20% oxygen. Conclusion : Decreased TA in the placenta from pregnancies with FGR was noted regardless of presence of preeclampsia indicating a probable correlation between FGR and placental senescence. Since increased TA was noted in trophoblastic cells that were cultured in hypoxic condition, we could speculate that the intervillous oxygen tension during early-stage placental development plays a certain role in the placental degeneration in pregnancies complicated by FGR and preeclampsia.
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임신 초기 융모막 융모와 탈락막에서의 Estrogen 수용체 및 Telomerase 활성도의 발현
송찬호(Chan Ho Song),김정연(Jung Youn Kim),박기현(Ki Hyun Park),배상욱(Sang Wook Bai),김세광(Sei Kwang Kim),정영내(Young Nae Jung),박규현(Kyu Hyun Park),정현철(Hyun Cheol Chung),장영건(Young Kwon Chang),권자영(Ja Young Kwon),조동제(D 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10
N/A Objective : To investigate whether there is any differences between normal pregnancy (NP) and spontaneous abortion (SAB) regarding estrogen receptor (ER) expression and telomerase activity (TA) in the chorionic villi and decidual tissues. Methods : Chorionic villi and decidual tissues were obtained between 6 and 9 weeks' gestation from 14 patients with SAB and 17 normal pregnant women who have undergone an elective abortion. All tissue samples were assayed for ER with enzyme immunoassay and also TA was analysed using telomeric repeat amplication protocol. Results : A significant decrease in ER expression (2.81±2.77 fmol/mg of protein; p<.001) was demonstrated in SAB group compared to that of NP group (4.56±1.85 fmol/mg) in decidua. However, no significant difference in ER expression in chorionic villi was found between the two groups. SAB group showed significantly lower levels of TA than that of NP group in both chorionic villi (21.4% vs. 82.4%; p=.002) and deciduas (7.1% vs. 52.9%; p=.009). Conclusion : Our results suggest that decreased level of ER expression in deciduas might cause decidual senescence and eventually, spontaneous abortion.
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한국인 폐경기 여성에서의 요 칼슘 배설과 골대사의 관계
오기원(Ki Won Oh),윤은주(Eun Joo Yun),오은숙(Eun Sook Oh),김상우(Sang Woo Kim),이덕철(Duk Chul Lee),장영건(Young Kwon Chang),노성일(Sung Il Roh),도병록(Byung Rok Do),강무일(Moo Il Kang) 대한내과학회 2002 대한내과학회지 Vol.63 No.4
목적 : 모든 여성은 폐경 후에 여성호르몬이 결핍되나 폐경 후 골다공증의 발병은 이들 폐경 후 여성 중 일부에서만 발생한다. 따라서 폐경 후 골다공증이 발병하는 여성에서는 정상 골밀도를 유지하는 여성과 달리 여성호르몬 결핍 이외에도 폐경 후 더 큰 골소실을 유도하는 또 다른 요인이 있을 것으로 생각된다. 본 연구에서는 신장에서의 칼슘소실이 폐경 후 골흡수 증가와 이에 따른 골다공증 발생의 한 원인인지 알아보기 위하여 한국인 폐경 전후 여성을 대상으로 하여 24시간 요 칼슘 배설량과 골밀도 및 골교체 표지자의 변화와의 관계를 관찰하였다. 방법 : 224명의 초기 폐경 후 여성, 158명의 후기 폐경 후 여성 및 145명의 폐경 전 여성을 연구대상으로 하였다. 연구대상에서는 24시간 요 칼슘 배설량, 요 deoxypyridinoline 농도, 혈청 osteocalcin과 알칼리성 인산분해효소 농도 및 요추골과 대퇴골 경부의 골밀도를 측정하였다. 결과 : 224명의 초기 폐경 후 여성 군에서 74명(33.0%)의 고칼슘뇨증이 있었다. 초기 폐경 후 여성 군에서 폐경 전 여성 군과 비교하여 평균 요 칼슘/크레아티닌 비와 혈청 칼슘 농도는 유의하게 높았다. 초기 폐경 후 여성 군 중 고칼슘뇨 군에서는 정상칼슘뇨 군과 비교하여 혈청 알칼리성 인산분해효소 농도와 요 deoxypyridinoline 농도가 유의하게 높았으며, 대퇴골 경부 골밀도는 고칼슘뇨 군에서 유의하게 낮았다. 결론 : 초기 폐경 후 여성에서 고칼슘뇨증 여성의 빈도가 많았으며 요 칼슘 배설이 증가하였고, 특히 고칼슘뇨 군에서는 골교체 표지자가 상승되었고, 대퇴골 경부 골밀도가 감소되었다. 따라서 고칼슘뇨증이 폐경 후 골다공증의 부분적인 기전으로 추측되나 직접적인 인과관계에 대하여는 향후 더 많은 연구가 필요할 것으로 생각된다. Background : Although all postmenopausal women are estrogen deficient, women who have postmenopausal osteoporosis may have some defects, in addition to estrogen deficiency, that explain for their higher rates of bone resorption and greater bone loss, relative to those who do not. To test the hypothesis that one of the defects is an impairment in renal calcium conservation, we have investigated relationship between urinary calcium excretion and bone mineral metabolism of postmenopausal women in Korea. Methods : We have measured 24-hour urinary calcium level; serum osteocalcin level, serum alkaline phosphatase level; urine deoxypyridinoline level; and bone mineral density in 224 early postmenopausal, 158 late postmenopausal and 145 premenopausal women. Results : 33.0 percent (74/224) of early postmenopausal women in Korea had urinary calcium excretion exceeding 4 mg/kg per day. The early postmenopausal women had higher (p<0.05) values for mean urinary calcium to creatinine ratio of 0.241±0.008 mg/mg of creatinine vs. 0.209±0.010 mg/mg of creatinine and higher (p<0.001) mean serum calcium level of 9.15±0.02 mg/dL vs. 8.92±0.03 mg/dL than the premenopausal women. Hypercalciuric group of early postmenopausal women had higher (p<0.05) values for mean urine deoxypyridinoline level (8.6±0.4 nMol/mMol Vs. 7.7±0.2 nMol/mMol), higher (p<0.05) mean serum alkaline phosphatase level (73.4±2.3 U/L Vs. 67.7±1.4 U/L) and lower (p<0.05) mean bone mineral density of femur neck (0.785±0.012 g/cm2 Vs. 0.815±0.008 g/cm2) than the normocalciuric group. Conclusion : The early postmenopausal women had larger numbers of hypercalciuric women and higher values for urinary calcium excretion than the premenopausal women. Hypercalciuric group of early postmenopausal women had higher values for biochemical markers of bone turnover and lower bone mineral density of femur neck than the normocalciuric group. We suggest that hypercalciuria could be accounted for the partial cause of postmenopausal osteoporosis, but further studies are needed to elucidate the direct effect about that.(Korean J Med 63:402-410, 2002)
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