• Nuclear Medicine and Molecular Imaging
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• 제41권3호
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• pp.241-246
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• 2007

목적: 베타아밀66로이드 양전자단층촬영 영상 추적자인 $[^{11}C]OH-BTA-1(1)$는 알쯔하이머병의 진단용으로 개발되었다. 반응용매 루프 방법에 의한 $[^{11}C]1$는 $[^{11}C]MeOTf$를 통해서 한번의 반응으로 $^{11}C$을 바로 표지 할 수 있다. 또한 반응 중에 $[^{11}C]2$가 생긴다는 것이 보고된바 있다. 하지만, 실험 중에 다른 부산물이 생기는 것이 발견되어 그 물질을 추정하고, 각 반응용매에 따른 $[^{11}C]1$과 부산물의 표지효율 변화에 대한 조사를 했다. 대상 및 방법: 사이클로트론에서 $^{14}N(p,{\alpha})^{11}C$ 핵반응과 미량의 $O_2$로 부터 의하여 생산되는 $[^{11}C]CO_2$를 0.2 M $LiAlH_4/THF$ 0.2 ml로 환원한 다음 HI 1ml과 반응하여 $[^{11}C]CH_3I$를 생산했다. 질소가스를 20 ml/min로 불어 주면서 200C 에서 AgOTf-Graphpac GC column를 통과시켜 $[^{11}C]CH_3OTf$를 생산했다. 각 반응용매 (MEK, CHO, DEK, DMF) 100 1에 녹인 전구물질 1 mg를 고성능 액체 크로마토그래피 시료 루프에 미리 주입하고 $[^{11}C]CH_3OTf$를 상온에서 7분 동안 질소가스를 불어줬다. Semi-preparative HPLC로 분리하였다. 결과: 각 반응용매에서 $[^{11}C]1$에 표지효율은 MEK: $86.0{\pm}5.5%$, CHO: $59.7{\pm}2.4%$, DEK: $29.9{\pm}1.8%$, DMF: $7.6{\pm}0.5%$이었다. MEK에서 얻은 $[^{11}C]1$의 비방사능은 98 ($GBq/{\mu}mol$)이다. 각 물질의 질량 분석은 1: m/z 257.3 (M+1), 2: 257.3 (M+1), 3: 271.3 (M+1)이었다. 각 생성물질의 표지효율은 MEK에서 $86.0{\pm}5.5%:5.0{\pm}3.4%:1.5{\pm}1.3%$ $([^{11}C]1:[^{11}C]2:[^{11}C]3)$, CHO에서 $59.7{\pm}2.4%:4.7{\pm}3.2%:1.3{\pm}0.5%$, DEK에서 $29.9{\pm}1.8%:2.0{\pm}0.7%:0.3{\pm}0.1%$, DMF에서 $7.6{\pm}0.5%:0.0%:0.0%$이다. 결론: $[^{11}C]1$은 4가지 반응용매 중 MEK 반응용매에서 가장 높은 표지효율을 나타냈다. 부산물인 $[^{11}C]3$은 고성능 액체 크로마토그래피의 자외선, 방사능 검출기와 질량 분석법을 통해 물질을 추정할 수 있었다.

• IMMUNE NETWORK
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• 제8권4호
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• pp.137-142
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• 2008

Background: CD11c, also known as integrin alpha x, is one of the optimum markers of dendritic cells. However, the regulation of the CD11c expression in mouse has not been identified yet. In this study, in order to analyze the regulation of CD11c expression, the promoter of CD11c was cloned and characterized. Methods: To identify the promoter portion, various sizes of what are considered to be CD11c promoter fragments was amplified by polymerase chain reaction (PCR), using mouse genomic DNA as a template. After sequence was obtained, these fragments were transfected into various cell lines including mouse dendritic cell lines such as JAWSII and DC2.4 and L929 as control cell line.. The promoter activity of three promoter fragments was measured and compared by luciferase activity in the transfected cells. Results: Three clones with size of 1kb, 3kb and 6kb were obtained from mouse genomic DNA. Flow cytometry analysis of JAWSII cells revealed that 52% of the cells expressed CD11c, which was confirmed by RT-PCR analysis. On the contrary, L929 and DC 2.4 cells did not express CD11c. The CD11c+ JAWSII cells were enriched from 52% to 90% with cell sorter. The comparative luciferase activity analyisis demonstrated that the region responsible for tissue specific expression was contained within -3 kb and the clone with size of 3 kb particularly showed higher luciferase activity than 6 kb and 1 kb clones. Conclusion: The CD11c promoter region containing the region responsible for tissue specificity was successfully cloned and -3 kb region showed the highest activity.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.199-201
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• 2002

Cancer therapy using high-energy $^{12}$ C ions is successfully under way at HIMAC, Japan. An alternative beam to $^{12}$ C is $^{11}$ C ions. The merit of $^{11}$ C over $^{12}$ C is its capability for monitoring spatial distribution of the irradiated $^{11}$ C by observing the $\beta$$^{+}$ decay with a good position resolution. One of the several problems to be solved before its use for therapy is the amount of nuclear interaction that deteriorates the dose concentration owing to the Bragg curve. Utilizing the dedicated secondary beam course for R&D studies at HIMAC, we measured the total energy loss of $^{11}$ C ions in a scintillator block that simulates the soft tissue in human bodies. In addition to the total absorption $^{11}$ C peak, non-negligible bump-shaped contribution is observed in the energy spectrum. The origin of the bump contribution can be nuclear interaction of the incident $^{11}$ C ions with hydrogen and carbon atoms. Further studies to reduce the ambiguity in dose distribution are mentioned.

• Bulletin of the Korean Chemical Society
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• 제19권9호
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• pp.952-956
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• 1998

An automated system was developed for the routine preparation of carbon-11 ($^11C$) labeled radiopharmaceuticals, which consisted of three major parts including [$^11C$]methylation of the precursor with [$^11C$] iodomethane ($[^11C]CH_3I)$, purification of the desired product and formulation of the final $^11C$ labeled radiopharmaceutical. The whole system included seven three-way slider valves, eleven solenoid valves, four pneumatic cylinders, a HPLC (High Performance Liquid Chromatography) system and a rotary evaporator. Using this system, we investigated the radiochemical synthesis of L-[$methyl-^11C$]methionine, which is the most widely used amino acid in tumor PET (Positron Emission Tomography) studies. The overall operation took 3035 min including the production of $[^11C]CH_3I$ (10.5 min) and decay-corrected radiochemical yield was 25%. The automated system we described herein can be widely utilized for the preparation of many $^11C$ labeled radiopharinaceuticals and has been shown to be efficient, reliable and easy to operate.

• Bulletin of the Korean Chemical Society
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• 제23권11호
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• pp.1527-1530
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• 2002

1,12-diazacyclodocosane-2,11-dione was first isolated from a plant Phyllanthus niruri Linn. Its structure has been determined by means of spectroscopy methods and X-ray crystallography. Two peptide groups in the big ring (lactam) are the main factors influencing intermolecular contacts. The hydrogen-bond interaction of these hydrophilic groups is observed in the crystal structure. Meanwhile, C-H···O hydrogen bonds in molecules contribute to the formation of the whole crystal. These two kinds of hydrogen-bond form six- member rings among molecules. This compound crystallizes in the triclinic space group P-1 with a= 9.588(1) $\AA$, b= $9.850(1)\AA$, c = $11.810(1)\AA$, $\alpha=$ 68.18(1)$^{\circ}C$ , $\beta=$ 84.98(1), $\gamma$ = 86.03(1)$^{\circ}C$ , V = $1030.66(17)\AA3$ , Z = 2. A disorder of five-member carbon chain in the whole ring is observed in the title compound. The bond angle 105.8(4) is determined for a extreme configuration C(14)-C(15)-C(16), and 117.7(10) for another extreme configuration C(14')-C(15')-C(16'). In this crystal, two molecules are tied each other by short intermolecular hydrogen bonds, the oxygen atom being tied by hydrogen bond to nitrogen atom of another two molecules. The NMR and IR spectral data coincides to the structure of the compound.

• 핵의학기술
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• 제12권3호
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• pp.181-183
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• 2008

We developed simple and highly efficient synthesis method for [$^{11}C$]methionine using solid-phase extraction method. For synthesis, we used C18 cartridge. [$^{11}C$]methionine was synthesized on C18 cartridge according to the solid-phase [$^{11}C$]methylation of precursor L-homocysteine thiolactone hydrochloride. The radiochemical yields of [$^{11}C$]methionine was $48.9{\pm}7.93%$ decay corrected (results of 30 syntheses, mean$\pm$SD), with average production higher than 180 mCi. This procedure showed high yield and simple synthesis of [$^{11}C$]methionine.

• 핵의학기술
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• 제20권2호
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• pp.9-13
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• 2016

비뇨기암에서의 $^{18}F-FDG$를 이용한 PET-CT 검사는 해부학적 구조 및 $^{18}F-FDG$의 배출 경로로 인해 암 진단에 한계가 있다. 그러한 한계점을 보완 할 수 있는 검사 중 아세트산을 이용한 검사가 진행되고 있으며 비뇨기암 환자를 대상으로 $^{11}C-Acetate$ PET-CT 검사의 임상 적용에 대하여 소개하고자 한다. 현재 본원에서 비뇨기암을 진단 받은 환자 중에 전립선암 환자 10명, 신세포암 환자 10명, 방광암 환자 2명을 총 22명을 임상 연구로 시행하였다. 모든 환자는 $^{18}F-FDG$ PET-CT 검사를 시행하였고, 평균 2주 정도의 기간 후에 $^{11}C-Acetate$ PET-CT 검사를 진행하였다. 검사 장비는 GE사의 D-710 PET-CT 장비를 사용했고, 검사 진행은 $^{11}C-Acetate$ 주사 후 15분 후에 PET-CT 검사를 시작하였고, $^{18}F-FDG$와 $^{11}C-Acetate$영상의 비교 평가는 핵의학과 전문의가 판별했다. 전립선암 환자의 경우 일반적으로 $^{18}F-FDG$의 섭취가 다른 암종에 비해 낮은 특징이 있다. 본원에서 연구된 10명의 환자 중 2명의 환자의 전이된 암이 $^{18}F-FDG$ 보다 $^{11}C-Acetate$의 섭취가 잘 나타났다. 신세포암의 경우 10명의 환자 중 8명의 환자에서 $^{18}F-FDG$ 보다 $^{11}C-Acetate$의 섭취가 확연히 잘 나타났다. 방광암 환자의 경우 방광의 $^{18}F-FDG$ 섭취가 너무 강하고, 이뇨제 사용여부와 환자의 조건이 맞지 않아 임상연구에서 제외하였다. 현재 임상 연구 진행 중인 검사로서 아직은 많은 환자에 대한 검사를 시행하지 못해서 이렇다 할 결과를 말하기에는 시기상조이다. 하지만, 해외에서는 이미 비뇨기암에서의 $^{11}C-Acetate$ PET-CT 검사가 어느 정도 유용하다는 논문이 많이 발표되었고, 본원에서도 현재 연구 진행 중이다. 보다 더 많은 환자에 대한 검사가 이루어진다면, 전립선암 환자에서 Prostatic specific antigen(PSA) 수치와 $^{11}C-Acetate$ PET-CT의 상관관계, 수술 전 환자에서의 조직 검사상의 Gleason sum 수치와의 상관관계, 다른 비뇨기암에서의 $^{18}F-FDG$ PET-CT 검사와 $^{11}C-Acetate$ PET-CT 검사 사이의 특이도, 민감도, 양성예측도, 음성예측도 등의 척도로서의 비교 등의 다양한 주제로서의 논문이 진행 될 수 있을 것이며, 비뇨기암에서의 $^{11}C-Acetate$ PET-CT 검사가 보다 더 활성화 되어 질 것이라 사료된다.

• 한국응용곤충학회지
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• 제31권4호
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• pp.492-495
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• 1992

멸구매미충의 포식성천적인 등검은황록장님노린재의 온도별 난기간, 약충기간, 성충기간(female) 및 산란수를 조사 하였고 온도와 난과 약충의 발육속도와의 관계를 조사하였다. 온도별 난기간은 20, 25, $30^{\circ}C$에서 각각 14.43, 9.33, 6.94일 이었다. 약충기간은 20, 25, $30^{\circ}C$에서 각각 24.30, 14.42, 11.90일 이었다. 성충기간(female)은 20, 25, $30^{\circ}C$에서 각각 11.20, 11.93, 11.89일 이었다. 발육영점온도는 난이 $^10.7{\circ}C$, 약충이 $9.8^{\circ}C$였으며 난에서 약충까지는 $10.2^{\circ}C$였고, 유효적산온일도는 난이 133.9, 약충이 235.8, 난에서 약충까지는 368.0온일도 있었다. 산란수는 25, $30^{\circ}C$에서 각각 26.0, 22.4개 이었다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1998년도 한국생물과학협회 학술발표대회
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• pp.360-360
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• 1998

C11, a chloride-containing VK3 analog, acts as a mediator of programmed cell death in SK-Hep-1 cell lines, but its molecular mechanisms linked to cell death are not understood. In this study, we investigated the expression of p21 gene and its relationship to apoptosis induced by C11. In SK -hep-1 cells, the addition of C11 resulted in time-dependent growth suppression and DNA fragmentation characteristics of apoptosis. p21 protein was induced during this process, while the protein level of p53 was not changed at the same condition. This apoptotic cell death with p21 induction was also observed in the Hep3B cells lacking functional p53 after treatment of C11. These results suggest that C11-induced apoptosis is associated with up-regulation of p21 protein in p53-independent pathway. Next, in order to confirm whether the p53-independent p21 induction is required for C11-induced apoptosis, we introduced the p21 gene into Hep3B. Overexpression of p21 did not affect the expression of the bcl-2 gene, but DNA fragmentation and PARa cleavage were significantly increased. These data indicate that p21 is involved in C11-induced apoptosis. Although Bcl-2 has been implicated to interfere with an essential signaling molecule involved in the apoptosis pathway, its molecular mechanism and target molecule are poorly understood. To determine the effects of bcl-2 overexpression on apoptosis and to investigate whether BcI-2 interfers with the p53-independent p21 pathway, we transfected the bcl-2 expression vector into SK - Hep-1 cels. Overexpression of Bcl-2 prevented C11-induced apoptosis. Taken together, C11-induced apoptosis is regulated by p52-independent p21 pathway and bcl-2 may inhibit functional activity of p21, therebe may inhibit the C11-induced apoptosis.ptosis.

• BMB Reports
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• 제52권11호
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• pp.641-646
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• 2019

The Ron proto-oncogene is a human receptor for macrophage-stimulating protein (MSP). The exclusion of exon 11 in alternative splicing generates ${\Delta}RON$ protein that is constitutively activated. Heterogenous ribonucleaoprotein (hnRNP) $C_1/C_2$ is one of the most abundant proteins in cells. In this manuscript, we showed that both hnRNP $C_1$ and $C_2$ promoted exon 11 inclusion of Ron pre-mRNA and that hnRNP $C_1$ and hnRNP $C_2$ functioned independently but not cooperatively. Moreover, hnRNP $C_1$ stimulated exon 11 splicing through intron 10 activation but not through intron 11 splicing. Furthermore, we showed that, whereas the RRM domain was required for hnRNP $C_1$ function, the Asp/Glu domain was not. In conclusion, hnRNP $C_1/C_2$ promoted exon 11 splicing independently by stimulating intron 10 splicing through RRM but not through the Asp/Glu domain.