• Clinical and Experimental Pediatrics
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• 제55권3호
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• pp.100-106
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• 2012

Purpose: The survival rate for childhood acute lymphoblastic leukemia (ALL) has improved significantly. However, overall prognosis for the 20 to 25% of patients who relapse is poor, and allogeneic hematopoietic stem cell transplantation (HSCT) offers the best chance for cure. In this study, we identified significant prognostic variables by analyzing the outcomes of allogeneic HSCT in ALL patients in second complete remission (CR). Methods: Fifty-three ALL patients (42 men, 79%) who received HSCT in second CR from August 1991 to February 2009 were included (26 sibling donor HSCTs, 49%; 42 bone marrow transplantations, 79%). Study endpoints included cumulative incidence of acute and chronic graft-versus-host disease (GVHD), relapse, 1-year transplant-related mortality (TRM), disease-free survival (DFS), and overall survival (OS). Results: Cumulative incidences of acute GVHD (grade 2 or above) and chronic GVHD were 45.3% and 28.5%, respectively. The estimated 5-year DFS and OS for the cohort was $45.2{\pm}6.8%$ and $48.3{\pm}7%$, respectively. Only donor type, i.e., sibling versus unrelated, showed significant correlation with DFS in multivariate analysis ($p$=0.010). The rates of relapse and 1 year TRM were $28.9{\pm}6.4%$ and $26.4{\pm}6.1%$, respectively, and unrelated donor HSCT ($p$=0.002) and HLA mismatch ($p$=0.022) were significantly correlated with increased TRM in univariate analysis. Conclusion: In this single institution study spanning more than 17 years, sibling donor HSCT was the only factor predicting a favorable result in multivariate analysis, possibly due to increased TRM resulting from unrelated donor HSCT.

• Journal of Korean Neurosurgical Society
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• 제38권5호
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• pp.366-374
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• 2005

Objective : Nitric oxide[NO] is implicated in a wide range of biological processes in tumors and is produced in glioma. To investigate the role of NO and its interaction with the tumoricidal effects of anticancer drugs, we study the antitumor activities of NO donors, with or without anticancer drugs, in human glioma cell lines. Methods : U87MG and U373MG cells were treated with the NO donors sodium nitroprusside[SNP] and S-nitroso-N-acetylpenicillamine[SNAP], alone or in combination with the anticancer drugs 1,3-bis[2-chloroethyl]-1-nitrosourea[BCNU] and cisplatin. Cell viability, cell proliferation, DNA fragmentation, nitrite level, and the expression of Bcl-2 and Bax were determined. Results : NO was markedly increased after treatment with SNP or SNAP; however, the addition of the anticancer drugs did not significantly affect NO production NO donors or anticancer drugs reduced glioma cell viability and, in combination, acted synergistically to further decrease cell viability in a dose- and time-dependent manner. Cell proliferation was inhibited and apoptosis were enhanced by combined treatment. Bax expression was increased by combined treatment, whereas Bcl-2 expression was reduced. The antitumor cytotoxicity of NO donors and anticancer drugs differed according to cell type. Conclusion : BCNU or cisplatin can inhibit cell viability and proliferation of glioma cells and can induce apoptosis. These effects are further enhanced by the addition of a NO donor which modulates the antitumor cytotoxicity of chemotherapy depending on cell type. Further biological, chemical, and toxicological studies of NO are required to clarify its mechanism of action in glioma.

• 대한이식학회지
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• 제32권4호
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• pp.108-112
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• 2018

Antibody-mediated rejection (AMR) is a major complication after ABO-incompatible liver transplantation. According to the 2016 Banff Working Group on Liver Allograft Criteria for the diagnosis of acute AMR, a positive serum donor specific antibody (DSA) is needed. On the other hand, the clinical significance of the histological findings of AMR in the absence of DSA is unclear. This paper describes a 57-year-old man (blood type, O+) who suffered from hepatitis B virus cirrhosis with hepatocellular carcinoma. Pre-operative DSA and cross-matching were negative. After transplantation, despite the improvement of the liver function, acute AMR was observed in the protocol biopsy on postoperative day 7; the cluster of differentiation 19+ (CD19+) count was 0% and anti-ABO antibody titers were 1:2. This paper presents the allograft injury like AMR in the absence of DSA after ABOi living donor liver transplantation with low titers of anti-ABO antibody and depleted serum CD19+ B cells.

• 한국수정란이식학회지
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• 제23권1호
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• pp.31-36
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• 2008

We attempted to control the maturation promoting factors (MPF) activity and nuclear remodeling of somatic cell nuclear transfer (NT) bovine embryos. Bovine ear skin fibroblasts were fused to enucleated oocytes treated with either 5 mM caffeine for 2.5 h or 0.5 mM vanadate for 0.5 h and activated. The nuclear remodeling type of the reconstituted embryos was evaluated 1.5 h after activation. MPF activity was assessed in enucleated and chemical treated oocytes before the injection of a donor cell. Effect of chemicals on the embryonic development was evaluated with parthenogenetic embryos. MPF activity increased significantly by caffeine treatment, but decreased by vanadate treatment (p<0.05). Caffeine or vanadate had no deleterious effect on the parthenogenetic embryo development. In caffeine treated group, premature chromosome condensation (PCC) was occurred in 72.2% of NT embryos (p<0.05). In contrast, vanadate induced the formation of a pronucleus-like structure (PN) in a high frequency (68.9%, p<0.05) without PCC (NPCC). Blastocyst development of NT embryos increased by treating with caffeine (30.3%), whereas decreased by treating with vanadate (11.4%) compared to control (22.1%, p<0.05). The results indicate that caffeine or vanadate can control of MPF activity and remodeling type of NT embryos, resulting in the increased or decreased in vitro development.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.93-93
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• 2010

Semiconductor nanocrystal quantum dots (NQDs) have recently attracted considerable interest for use in photovoltaics. Band gaps of NQDs can be tuned over a considerable range by varying the particle size thereby allowing enhance absorption of solar spectrum. NQDs, synthesized using colloidal routes, are solution processable and promise for a large-area fabrication. Recent advancements in multiple-exciton generation in NQD solutions have afforded possible efficiency improvements. Various architectures have attempted to utilize the NQDs in photovoltaics, such as NQD-sensitized solar cell, NQD-bulk-heterojuction solar cell and etc. Here we have fabricated CdSe NQDs with the band gap of 1.8 eV to 2.1 eV on thin-layers of p-type organic crystallites (1.61 eV) to realize a donor-acceptor type heterojuction solar cell. Simple structure as it was, we could control the interface of electrode-p-layer, and n-p-layer and monitor the following efficiency changes. Specifically, surface molecules adsorbed on the NQDs were critical to enhance the carrier transfer among the n-layer where we could verify by measuring the photo-response from the NQD layers only. Further modifying the annealing temperature after the deposition of NQDs on p-layers allowed higher conversion efficiencies in the device.

• Journal of Veterinary Science
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• 제23권2호
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• pp.40.1-40.13
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• 2022

Background: Somatic cell nuclear transfer (SCNT) is used widely in cloning, stem cell research, and regenerative medicine. The type of donor cells is a key factor affecting the SCNT efficiency. Objectives: This study examined whether urine-derived somatic cells could be used as donors for SCNT in pigs. Methods: The viability of cells isolated from urine was assessed using trypan blue and propidium iodide staining. The H3K9me3/H3K27me3 level of the cells was analyzed by immunofluorescence. The in vitro developmental ability of SCNT embryos was evaluated by the blastocyst rate and the expression levels of the core pluripotency factor. Blastocyst cell apoptosis was examined using a terminal deoxynucleotidyl transferase dUTP nick end-labeling assay. The in vivo developmental ability of SCNT embryos was evaluated after embryo transfer. Results: Most sow urine-derived cells were viable and could be cultured and propagated easily. On the other hand, most of the somatic cells isolated from the boar urine exhibited poor cellular activity. The in vitro development efficiency between the embryos produced by SCNT using porcine embryonic fibroblasts (PEFs) and urine-derived cells were similar. Moreover, The H3K9me3 in SCNT embryos produced from sow urine-derived cells and PEFs at the four-cell stage showed similar intensity. The levels of Oct4, Nanog, and Sox2 expression in blastocysts were similar in the two groups. Furthermore, there is a similar apoptotic level of cloned embryos produced by the two types of cells. Finally, the full-term development ability of the cloned embryos was evaluated, and the cloned fetuses from the urine-derived cells showed absorption. Conclusions: Sow urine-derived cells could be used to produce SCNT embryos.

• 한국가축번식학회지
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• 제24권4호
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• pp.365-373
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• 2000

체세포 핵이식이 완료된 수정란을 70 volt 40 $\mu\textrm{s}$ 1회, 70 volt 40 $\mu\textrm{s}$ 2회, 180 volt 15 $\mu\textrm{s}$ 1 회 및 180 volt 30 $\mu\textrm{s}$ 1회의 전압을 이용하여 융합을 실시하였으며, 융합배지로는 mannitol 및 ZCFM 을 사용하였다. 70 volt 40 $\mu\textrm{s}$ 1회, 70 volt 40 $\mu\textrm{s}$ 2회 및 180 volt 15 $\mu\textrm{s}$ 1회의 전압을 이용하여 공핵 난구세포와 수핵란 세포질간에 융합을 유도한 결과, 융합율은 각각, 0.0%, 25.4% 및 58.1% 였으며, 배반포 발생율은 각각, 0.0%, 13.3% 및 36.1 % 였다. 180 volt 15 $\mu\textrm{s}$ 1회의 전압을 이용하였을 때 융합율 및 배반포 발생율이 유의적으로 높았다 (P＜0.05). 180 volt 15 $\mu\textrm{s}$ 및 30 $\mu\textrm{s}$ 1회의 전압을 이용하여 공핵 태아 섬유아세포와 수핵란 세포질간에 융합을 유도한 결과, 융합율은 각각,4 5.7% 및 63.2% 였으며, 배반포 발생율은 각각, 24.3% 및 25.0% 였다. 융합율은 180 volt 30 $\mu\textrm{s}$ 1회의 전압을 이용하였을 때 유의적으로 높았으나, 배반포 발생율에 있어서는 차이를 나타내지 않았다(P＜0.05). Mannitol 및 ZCFM 을 이용하여 융합을 실시한 결과, 융합율은 각각, 71.2 % 및 65.8% 였고, 배반포 발생율은 각각, 37.8% 및 39.8% 였다. 융합배지간 융합율 및 발생율에 있어서는 유의적인 차이를 나타내지 않았다.

• 한국발생생물학회지:발생과생식
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• 제11권2호
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• pp.67-77
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• 2007

최근 제 1형 당뇨병을 치료하기 위하여 인슐린-분비성 세포를 이식하는 세포대체요법이 새로운 치료법으로서 주목받고 있다. 그럼에도 불구하고 췌장세포 이식술은 이식원의 절대적인 부족으로 인해 광범위한 시행이 이루어지지 못하고 있는 실정이다. 무한증식과 전분화능을 보유하는 배아줄기세포는 이식할 $\beta$-세포의 부족을 해결할 수 있는 잠재적 세포공급원이 될 수 있을 것으로 기대된다. 본 종설에서는 인간배아줄기세포로부터 췌장 $\beta$-세포로의 유도분화방법에 관한 최근 동향을 살펴보고, 당뇨병 치료에 세포 이식술을 적용함에 있어 고려해야할 문제점 및 극복방안들을 소개하고자 한다.

• 한국가축번식학회지
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• 제26권4호
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• pp.329-338
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• 2002

This study was carried out to investigate the developmental rates of embryo reconstructed with different cell type and to estimate correlation of transcriptional level of octamer-binding transcription factor 4 (Oct4) and fibroblast growth factor 4 (FCF4) gene on peri-implantation stage embryos. Donor cells were transferred into perivitelline space of enucleated oocytes. The karyoplast-cytoplast couplets were accom- plished by cell to cell fusion and activated with ionomycin and 6-dimethylaminopurine. Reconstructed embryos were co-cultured with bovine oviduct epithelial cells in CR 1 aa medium. There is no difference in blastocyst formation rate following nuclear transfer UT) with fetal fibroblast cell (16/50; 32.0%), cumulus cell (16/49; 32.6%) and ear cell (17/52; 32.6%). The expression level of Oct4 and FCF4 in peri-implantation bovine embryo derived from in vitro fertilization (IVF) and NT were determined by reverse-transcription polymerase chain reaction (RT-PCR) technique. In peri-implantation of IVF result in a transient increased of FCF4 paralleled by an increased expression of Oct4. However, Oct4 gene was highly expressed in hatching blastocysts derived from NT compared to IVF. Also, FGF4 expression level in hatching blastocysts and outgrowth stage derived from NT was lower than that of IVF. In conclusion, it is suggested that the different transcription patterns observed in nuclear transfer embryos may lead to a lower rate of embryo development, implantation and pregnancy.

• Reproductive and Developmental Biology
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• 제35권4호
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• pp.485-489
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• 2011

The present study was conducted to examine the reactive oxygen species (ROS) generation levels and subsequent DNA damage in the bovine cultured somatic cells. Bovine ear skin cells were classified by serum starvation, confluence and cycling cells. Cells were stained in 10 ${\mu}M$ dichlorohydrofluorescein diacetate ($H_2DCFDA$) or 10 ${\mu}M$ hydroxyphenyl fluorescein (HPF) dye to measure the $H_2O_2$ or $^{\cdot}OH$ radical levels. The samples were examined with a fluorescent microscope, and fluorescence intensity was analyzed in each cell. $H_2O_2$ and $^{\cdot}OH$ radical levels of cultured somatic cells were high in confluence group ($7.1{\pm}0.7$ and $8.4{\pm}0.4$ pixels/cell, respectively) and significantly low in serum starvation group ($4.9{\pm}0.4$ and $7.0{\pm}0.4$ pixels/cell, respectively, p<0.05). Comet tail lengths of serum starvation ($148.3{\pm}5.7$ ${\mu}M$) and confluence ($151.1{\pm}5.0$ ${\mu}M$) groups were found to be significantly (p<0.05) increased in comparison to that of cycling group ($137.1{\pm}7.5$ ${\mu}M$). These results suggest that the culture type of donor cells can affect the ROS generation, which leads the DNA fragmentation of the cells.