• 한국연초학회지
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• 제13권1호
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• pp.36-42
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• 1991

The present study was conducted to obtain some basic information on the shoot formation from crown gall callus and the characteristics of teratoma shoot derived from crown gall induced by inoculation of Agrobacterium tumefaciens C58. Crown gall callus could be continuously cultured on the phyohormone free basic medium. The growth of crown gall callus was inhibited when BA were added to the cultural media. Shoot formation from crown gall callus fail to be initiated except teratoma shoot which induced on the phytohormone free medium after several subculture on rare occasions. Teratoma shoot could not form root and grow as normal shoot. Addition of BA to cultural media was not effective for shoot elongation, reduction in multiple shoot formation, but IBA was somewhat effective for shoot elongation of teratoma shoot, never for root formation.

• 식물조직배양학회지
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• 제25권2호
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• pp.135-139
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• 1998

연초 N. glauoa(2n=24)와 N. langsdorffii(2n=18)의 종간상 호교잡에 의하여 종간잡종을 획득하였다. N. glauca $\times$ N. langsdorffii 교잡에서는 100%의 F$_1$ 종자를 획득할 수 있었으나, N. langsdorffii $\times$ N. glauca교잡에서는 종자결실이 극히 불량하였다. 그러나 종자 발아율은 모두 양호하였으며, 정상 식물체로 생장하였다. F$_1$식물체의 chromosome수를 조사한 결과 모두 2n=21개로 종간잡종임이 확인되었으며, 엽병의 존재여부 및 형태, 잎의 형태, 꽃잎의 형태와 색깔 및 크기, 화분의 색깔 등의 형태적 특성을 조사한 결과 모두 종간잡 종임을 재차 확인 할 수 있었다. F$_1$잡종식물체에서는 spontaneous tumor인 genetic tumor가 형성되었으며, N. glauca을 모본으로 한 교잡체에서는 생식생장기부터 형성되었고, N. langsdorffii을 모본으로 한 잡종체에서는 생식생장기 이후에만 형성되었다. 특히 genetic tumor 조직을 기내에서 식물호르몬 무첨가 배지에서 배양할 경우 생장이 매우 왕성하였으며 많은 teratoma shoot를 형성하였다. 또한 genetic tumor 조직이 아닌 일반 F$_1$식물체의 잎과 줄기절편도 식물호르몬 무첨가 배지에 접종되었을 때에도 15일경부터 callus가 왕성히 형성되었으며, 30일경부터는 수많은 teratoma shoot가 형성되었다. 식물호르몬 무첨가배지에서 잡종체의 teratoma shoot 형성은 N. langsdorffii $\times$ N. glauca 보다 N. glauca $\times$ N. langsdorffii가 더 양호한 경향을 보였다. Teratoma shoot 중에서는 뿌리는 가지고 있지 않지만 지상부가 정상적으로 자란 shoot를 절취하여 다시 조직배양 할 경우에는 영양생장기에 배양잡종식물체에서 많은 genetic tumor가 형성되었다.

• Journal of Chest Surgery
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• 제10권1호
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• pp.59-64
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• 1977

Mediastinal tumor are frequently encountered in clinical practice. Hanten, in 1955, reported-2 adult patients with spontaneous rupture of mediastinal dermoid cysts into the pleural cavity and also, Thompson, in 1963, reported 2 child patients with spontaneous rupture of mediastinal teratoma into the pleural cavity. Mediastinal teratomas have also been reported rupture into other contiguous structures, such as the bronchus, aorta, pericardium, SVC and esophagus. This report presents an instance of spontaneous rupture of an anterior mediastinal teratoma into the right pleural cavity of a 43 year old female. Despite variable diagnostic procedures, the true nature of the lesion was not determined until a thoracotomy and window formation was performed for adequate drainage of empyema thoracis. Removal of the teratoma and mediastinal window formation resulted in complete cure.

• 한국연초학회지
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• 제14권1호
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• pp.33-41
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• 1992

These studies were conducted to investigate effects of phytohormone and activated carbon on the growth and rooting of teratoma shoots induced from Nicotiana tabacum cv. NC2326 transformed by Aerobacterium tumefaciens C58. GA was effective for shoot elongation and reduction of multiple shoots from teratoma shoot, however, leaves of teratoma shoot cultured on the medium with GA were pointed. ABA was also effective in promoting shoot elongation, but was not for reduction of multiple shoots. Teratoma shoot cultured on the medium with 1 n activated carbon promoted shoot elongation and inhibited the number of shoots differentiated, but was grown as abnormal shoot. Addition of 1% activated carbon and 0.5mg/l BA to culture media was effective for shoot elongation and reduction of multiple shoot and for formation of round leaves as normal leaves. Though these shoots were inoculated on the rooting medium, they could not from roots but formed multiple shoots. Boric acid, myo-inositol and sucrose were also ineffective on the rooting of teratoma shoots.

• BMB Reports
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• 제55권3호
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• pp.142-147
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• 2022

Human pluripotent stem cells (PSCs) have been utilized as a promising source in regenerative medicine. However, the risk of teratoma formation that comes with residual undifferentiated PSCs in differentiated cell populations is most concerning in the clinical use of PSC derivatives. Here, we report that a monoclonal antibody (mAb) targeting PSCs could distinguish undifferentiated PSCs, with potential teratoma-forming activity, from differentiated PSC progeny. A panel of hybridomas generated from mouse immunization with H9 human embryonic stem cells (hESCs) was screened for ESC-specific binding using flow cytometry. A novel mAb, K312, was selected considering its high stem cell-binding activity, and this mAb could bind to several human induced pluripotent stem cells and PSC lines. Cell-binding activity of K312 was markedly decreased as hESCs were differentiated into embryoid bodies or by retinoic acid treatment. In addition, a cell population negatively isolated from undifferentiated or differentiated H9 hESCs via K312 targeting showed a significantly reduced expression of pluripotency markers, including Oct4 and Nanog. Furthermore, K312-based depletion of pluripotent cells from differentiated PSC progeny completely prevented teratoma formation. Therefore, our findings suggest that K312 is utilizable in improving stem cell transplantation safety by specifically distinguishing residual undifferentiated PSCs.

• 식물조직배양학회지
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• 제26권1호
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• pp.31-35
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• 1999

연초 crown gall tumor와 genetic tumor의 형성시 형태적 특성과 조직배양시 식물호르몬에 대한 반응을 조사하였다. Crown gall tumor는 A. tumefaciens C58을 감염시켜 형질전환된 tumor조직으로부터 획득하였으며, genetic tumor는 N. glauca (2n=24)와 N. langsdorffii (2n=18)의 종간교배에 의하여 유기된 잡종식물체에서 자발적으로 발생한 tumor조직으로부터 획득하였다. 형성된 crown gall tumor, genetic tumor및 teratoma shoot의 형태적 특성은 매우 비슷하였으며, 식물조직배양시 식물호르몬이 전혀 첨가되지 않은 기본배지에서 생장이 왕성하였다. Crown gall tumor는 식물호르몬 무첨가배지에서 전형적인 tumor callus가 형성되었으며 teratoma shoot도 형성되었다. 반면에 genetic tumor는 2,4-D 0.5mg/L 첨가된 배지에서 tumor callus가 형성되었으며, 식물호르몬 무첨가배지에서는 많은 teratoma shoot가 형성되어 식물호르몬의 조절에 의해서 phenotype을 거의 비슷하게 할 수 있었다. Genetic tumor는 재분화시 정상적인 식물체보다는 뿌리를 갖지 못하는 teratoma shoots가 형성되는데 외부에서 인위적으로 식물호르몬인 IAA와 GA, 그리고 active carbon을 첨가하여 완전한 식물체를 생산하는 데는 실패하였다. 그러나 간혹 식물호르몬 무첨가배지에서 뿌리를 갖는 정상식물체로 생장하는 shoot가 형성되었는데 이런 식물체에서도 생장하면서 줄기부분에서 다시 genetic tumor가 형성되었으며, 잎절편을 다시 식물호르몬 무첨가배지에 접종할 경우에도 teratoma shoots를 형성하였다.

• Asian Pacific Journal of Cancer Prevention
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• 제14권10호
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• pp.5705-5711
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• 2013

Background: Embryonic stem cells (ESCs) have the potential to form teratomas when implanted into immunodeficient mice, but data in immunocompetent mice are limited. We therefore investigated teratoma formation after implantation of three different mouse ESC (mESC) lines into immunocompetent mice. Materials and Methods: BALB/c mice were injected with three highly germline competent mESCs (129Sv, BALB/c and C57BL/6) subcutaneously or under the kidney capsule. After 4 weeks, mice were euthanized and examined histologically for teratoma development. The incidence, size and composition of teratomas were compared using Pearson Chi-square, t-test for dependent variables, one-way analysis of variance and the nonparametric Kruskal-Wallis analysis of variance and median test. Results: Teratomas developed from all three cell lines. The incidence of formation was significantly higher under the kidney capsule compared to subcutaneous site and occurred in both allogeneic and syngeneic mice. Overall, the size of teratoma was largest with the 129Sv cell line and under the kidney capsule. Diverse embryonic stem cell-derived tissues, belonging to the three embryonic germ layers, were encountered, reflecting the pluripotency of embryonic stem cells. Most commonly represented tissues were nervous tissue, keratinizing stratified squamous epithelium (ectoderm), smooth muscle, striated muscle, cartilage, bone (mesoderm), and glandular tissue in the form of gut- and respiratory-like epithelia (endoderm). Conclusions: ESCs can form teratomas in immunocompetent mice and, therefore, removal of undifferentiated ESC is a pre-requisite for a safe use of ESC in cell-based therapies. In addition the genetic relationship of the origin of the cell lines to the ability to transplant plays a major role.

• BMB Reports
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• 제56권8호
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• pp.463-468
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• 2023

Screening for genetic defects in the cells should be examined for clinical application. The Pearson syndrome (PS) patient harbored nuclear mutations in the POLG and SSBP1 genes, which could induce systemic large-scale mitochondrial genome (mtDNA) deletion. We investigated iPSCs with mtDNA deletions in PS patient and whether deletion levels could be maintained during differentiation. The iPSC clones derived from skin fibroblasts (9% deletion) and blood mononuclear cells (24% deletion) were measured for mtDNA deletion levels. Of the 13 skin-derived iPSC clones, only 3 were found to be free of mtDNA deletions, whereas all blood-derived iPSC clones were found to be free of deletions. The iPSC clones with (27%) and without mtDNA deletion (0%) were selected and performed in vitro and in vivo differentiation, such as embryonic body (EB) and teratoma formation. After differentiation, the level of deletion was retained or increased in EBs (24%) or teratoma (45%) from deletion iPSC clone, while, the absence of deletions showed in all EBs and teratomas from deletion-free iPSC clones. These results demonstrated that non-deletion in iPSCs was maintained during in vitro and in vivo differentiation, even in the presence of nuclear mutations, suggesting that deletion-free iPSC clones could be candidates for autologous cell therapy in patients.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 1998년도 춘계임시총회 및 학술발표대회
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• pp.9-9
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• 1998

• 식물조직배양학회지
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• 제27권3호
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• pp.203-211
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• 2000

흰독말풀의 tumor조직에서 유도한 tumor callus로부터 scopolamine의 생산을 극대화하기 위한 연구를 수행하였다. Tumor callus의 생장률을 증가시키기 위해서는 초기접종량을 배지의 2%로 하고 배양기간은 4주가 효과적이다. 그래서 만일 이단계배양을 추진하려면 배지교체의 시기는 3주가 가장 적당한 것으로 확인되었다. Scopolamine의 생성을 위한 광의 효과를 알아본 결과, 암상태보다 광상태가 callus생장 및 scopolamine 함량 증가에 효과적이었다. Scopolamine 함량 증가의 최적 광량은 16$\mu$mo1 m$^{-2}$ s$^{-1}$, 광질은 적색파장 그리고 연속광보다 장일조건 (16/8)의 광주기에서 tropane alkaoid인 scopolamine합성이 현저히 촉진되었다. 질소원으로는 산화형 질소인 NO$_{3}$$^{-}$ 를 4 g/L로 증가시키는 것이 가장 효과적인 것으로 확인되었다. Scopolamine의 함량을 증가시키기 위한 elicitor 공급은 10 mg/L chitosan과 15 mg/L yeast추출물이 가장 효과적이었으며, 전구물질로는 0.2 mM tropine과 0.3 mM tropic acid가 가장 우수한 것으로 확인되었다. 이러한 결과를 종합해 보면, 흰독말풀 tumor callus에서 scopolamine 대량생산을 추진할 경우 3주 동안 광상태와 무기이온 조성을 균형 있게 조절하여 생장을 최대로 증가시킨 후, 1주 동안 scopolamine생산을 위해 elicitor, precursors 등이 조합된 배지에서 biotransformation 시키는 것이 가장 효과적일 것으로 판단된다. 또한 tumor callus에 $^{60}$Co${\gamma}$-ray을 조사하여 3K, 4K및 6k tumorcallus를 확보하였으며, 이들로부터 유도한 teratoma는 형태적 변이를 나타내었다. Teratoma로부터 또 다시 새로운 teratoma-callus 세포주를 유도하여 현탁배양을 수행하였던 바, MS 기본 배지에서 1.0 mg/L 2.4-D과 0.5 mg/L kinetin을 조합하여 처리한 callus 의 액체배양에서 cell aggregation이 일어나지 않고 세포가 유리화 되면서 왕성한 생장을 보였다.