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Hwang, Ki-Jun,Chun, Moon-Woo,Jacobson, Kenneth A.,Jeong, Lak-Shin,Lee, Jeong-A,Moon, Hyung-Ryong,Kim, Hea-Ok,Kim, Kyung-Ran,Lee, Kang-Man,Kim, Bum-Tae 이화여자대학교 약학연구소 2005 藥學硏究論文集 Vol.- No.16
On the basis of the biological activity of neplanocin A and apio-dideoxyadenosine (apio-ddA), novel apio-neplanocin A analogues 5a- d, combining the properties of two nucleosides, were stereoselectively synthesized. The apio moiety of the target nucleosides 5a-d was stereoselectively introduced by treating· lactol 10 with 37% formaldehyde in the presence of potassium carbonate. The carbasugar moiety of neplanocin A was successively built by exposing diene 12 on a Grubbs catalyst in methylene chloride. The final nucleosides 5a-d were synthesized from the condensation of the glycosyl donor 14 with nucleic bases under the standard Mitsunobu conditions. Similarly, apio-aristeromycin 6 and (N)-apio-methanocarbaadenosine 7 were derived from the common intermediate 13 using catalytic hydrogenation and Simmons-Smith cyclopropanation as key steps. All of the final nucleosides 5a-4, 6, and 7 did not show significant inhibitory activity against S-adenosylllolllocysteine hydrolase (SAH) up to 100 ㎛, maybe due to the absence of the secondary hydroxyl group at tile C3'-position, which should be oxidized by cofactor-bound NAD^(+). However, aplo-neplanocin A (5a) showed potent and highly selective binding affinity (K_(i), = 628 ± 69 nM) at the A_(3) adenosine receptor without any binding affinity at the A_(1) and A_(2A) adenosine receptors. In conclusion, we have first developed novel carbocyclic nucleosides with unnatural apio-carbasugarsusing stereoselective hydroxymethylation and RCM reaction and also discovered a new template of human A_(3) adenosine receptor agonist, which play a great rote in developing new A_(3) adenosine receptor agonist as well as in identifying the binding site of the receptor.
Effects of Steroid Hormones on GVBD and Oocyte Steroidogenesis in Blacktip Grouper
Hwang In-Joon,Kim Seol-Ki,Choi Sang-Jun,Lee Chi-Hoon,Lee Young-Don,Kim Hyung-Bae,Baek Hea-Ja 한국발생생물학회 2012 발생과 생식 Vol.16 No.1
To verify the sex steroids which are involved in oocyte maturation of the blacktip grouper, , we incubated vitellogenic oocytes (0.41 and 0.50 mm in average diameter) in the presence of exogenous steroid precursor (-hydroxyprogesterone). Steroids were extracted, separated and identified by thin layer chromatography. The major metabolites produced were androstenedione, estradiol-, estrone and progestogens. Progestogen metabolites in the oocytes of 0.50 mm were more abundant than those of 0.41 mm. Also, we investigated the effects of human chorionic gonadotropin (HCG; 5, 50 and 500 ), -dihydroxy-4-pregnen-3-one () and -trihydroxy-4-pregnen-3-one (; 5, 50 and 500 , respectively) on oocyte maturation. In the oocytes of 0.41 mm, treatment with 50 IU HCG stimulated GVBD () compared with controls (, <0.05). In the oocytes of 0.50 mm, treatment of (50 and 500 ) stimulated GVBD ( and , respectively) compared with controls (, <0.05). Treatment with 500 IU HCG also stimulated GVBD () compared with controls (<0.05). Taken together, these results suggested that both HCG and were effective on in vitro oocyte maturation and may act as a maturation inducing hormone in blacktip grouper.
Hwang, In-Joon,Kim, Seol-Ki,Choi, Sang-Jun,Lee, Chi-Hoon,Lee, Young-Don,Kim, Hyung-Bae,Baek, Hea-Ja The Korean Society of Developmental Biology 2012 발생과 생식 Vol.16 No.1
To verify the sex steroids which are involved in oocyte maturation of the blacktip grouper, $Epinephelus$ $fasciatus$, we incubated vitellogenic oocytes (0.41 and 0.50 mm in average diameter) in the presence of exogenous steroid precursor ($[^3H]17{\alpha}$-hydroxyprogesterone). Steroids were extracted, separated and identified by thin layer chromatography. The major metabolites produced were androstenedione, estradiol-$17{\beta}$, estrone and progestogens. Progestogen metabolites in the oocytes of 0.50 mm were more abundant than those of 0.41 mm. Also, we investigated the $in$ $vitro$ effects of human chorionic gonadotropin (HCG; 5, 50 and 500 $IU/m{\ell}$), $17{\alpha},20{\beta}$-dihydroxy-4-pregnen-3-one ($17{\alpha}20{\beta}P$) and $17{\alpha},20{\beta}$-trihydroxy-4-pregnen-3-one ($17{\alpha}20{\beta}21P$; 5, 50 and 500 $ng/m{\ell}$, respectively) on oocyte maturation. In the oocytes of 0.41 mm, treatment with 50 IU HCG stimulated GVBD ($55.30{\pm}1.20%$) compared with controls ($32.41{\pm}3.13%$, $p$<0.05). In the oocytes of 0.50 mm, treatment of $17{\alpha}20{\beta}P$ (50 and 500 $ng/m{\ell}$) stimulated GVBD ($50.13{\pm}2.52$ and $51.77{\pm}5.91%$, respectively) compared with controls ($36.81{\pm}2.89%$, $p$<0.05). Treatment with 500 IU HCG also stimulated GVBD ($49.59{\pm}5.15%$) compared with controls ($p$<0.05). Taken together, these results suggested that both HCG and $17{\alpha}20{\beta}P$ were effective on in vitro oocyte maturation and $17{\alpha}20{\beta}P$ may act as a maturation inducing hormone in blacktip grouper.
Effects of age and gender on spatial orientation of human corpus callosum in healthy Koreans
Hwang, Seung-Jun,Park, Chan,Hong, Hea-Nam,Ryu, Ji-Yeon,Park, In-Sung,Rhyu, Im-Joo The Korean Society for Integrative Biology 2011 Animal cells and systems Vol.15 No.4
The changes in the corpus callosum (CC) with age and gender remain largely subject to dispute, which might come from the different strategies for analyzing the size and shape of CC. We have investigated this issue by measuring some variables reflecting the spatial orientation of CC on magnetic resonance imaging in Koreans, which minimize individual variances in the brain. The subjects were composed of young adults in their twenties (51 male, 59 female) and elderly adults in their sixties and seventies (60 male, 71 female). The total area of CC, length and height of CC, the central angle and the four angles suggested by Oka et al. were measured. The whole area and the central angle of CC were not significantly affected by age and gender. The height and length of CC were significantly greater in elderly people. The angle connecting genu, upper notch of pons and splenium was significantly larger in the elderly group. Furthermore, all four angles were significantly different between male and female subjects. These results confirm that the spatial orientation of CC is influenced by age and gender.
신혜선(Hea-Sun Shin),김형미(Hyung-Mi Kim),김수민(Su-Min Kim),신지원(Ji-Won Shin),최안나(Anna Choi),엄성용(Seong-Yong Ohm),황준(Jun Hwang) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2A
본 논문은 연속적으로 촬영된 화상으로부터 추출된 관절 운동 정보를 실시간으로 분석하기 위한 효과적인 인식 방법에 대해 설명 한다. 관절의 움직임은 2 차원 상에서 이루어진다고 가정하고 관절의 세 지점에 형광 마커(marker)를 부착한 다음 화상에서의 마커 위치의 범위를 미리 예상하여 추적함으로써 인식과 분석의 속도를 높여 제한된 시간 내에서 실시간 분석을 가능하게 한다.