• Journal of Yeungnam Medical Science
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• 제4권1호
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• pp.89-96
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• 1987

동물의 간소엽에 심한 지방성병변과 괴사성병변을 일으키는 사염화탄소와 이와 비슷한 독작용을 가지고 동물의 간소엽에 심한 출혈성 괴사성병변을 초래하는 Dimethylnitrosamine이 동일물질의 2~3회 반복투여에 의해서 어떠한 영향을 받는가를 비교, 관찰하기 위하여 체중 150~200gm의 백서를 실험동물로 사용하여 Sublethal dose의 사염화탄소(0.4ml/kg)와 DMN(40mg/kg)을 1회, 2회 및 3회 복강내로 주입하여 간소엽에 나타난 병리조직학적 병변을 요약하면 다음과 같다. 1. 사염화탄소를 1회 투여한 동물의 간소엽에 있어서 지방변성 괴사성병변에 비해 2회 또는 3회 반복투여한 동물의 병변정도가 경하였고, 또 간세포나 동양세포의 재생성 변화도 더 빨리 일어났다. 2. DMN을 1회 투여한 동물에 있어서의 괴사성병변은 2회 또는 3회 투여한 군의 그것과 큰 차이는 없었지만 간세포의 증식성 변화는 DMN의 투여회수가 많을수록 비례해서 강하게 나타나는 경향을 보였다.

• Journal of Chest Surgery
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• 제41권6호
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• pp.795-798
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• 2008

50세 남자 환자가 좌상복부 동통 및 발열 증상을 주소로 내원하였다. 환자는 과거력상 28년전에 폐결핵 및 늑막염으로 약물치료를 받았으며 8년전 재생불량성 빈혈로 비장 절제술을 받았다. 내원 후 시행한 CT 검사상에서 만성 좌측 농흉과 연결을 보이는 복강내 농양이 진단되었다. 만성 농흉과 더불어 전흉벽에 농흉에 의한 흉벽 침습이 의심되는 병병도 아울러 관찰되었다. 환자는 복강내 농양 배액술 이후 좌측 늑막전폐절제술 및 흉벽 절제술을 시행 받았고 병리 조직 검사상 육종이 진단되었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제36권4호
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• pp.243-249
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• 2010

Tissue engineered bone (TEB) can replace an autogenous bone graft requiring an secondary operation site as well as avoid complications like inflammation or infection from xenogenic or synthetic bone graft. Adult mesenchymal stem cells (MSC) for TEB are considered to have various ranges of differentiation capacity or multipotency by the donor site and age. This study examined the effect of age on proliferation capacity, differentiation capacity and bone morphogenetic protein-2 (BMP-2) responsiveness of human bone marrow stromal cells (hBMSC) according to the age. In addition, to evaluate the effect on enhancement for osteoblast differentiation, the hBMSC were treated with Trichostatin A (TSA) and 5-Azacitidine (5-AZC) which was HDAC inhibitors and methyltransferase inhibitors respectively affecting chromatin remodeling temporarily and reversibly. The young and old group of hBMSC obtained from the iliac crest from total 9 healthy patients, showed similar proliferation capacity. Cell surface markers such as CD34, CD45, CD90 and CD105 showed uniform expression regardless of age. However, the young group showed more prominent transdifferentiation capacity with adipogenic differentiation. The osteoblast differentiation capacity or BMP responsiveness was low and similar between young and old group. TSA and 5-AZC showed potential for enhancing the BMP effect on osteoblast differentiation by increasing the expression level of osteogenic master gene, such as DLX5, ALP. More study will be needed to determine the positive effect of the reversible function of HDAC inhibitors or methyltransferase inhibitors on enhancing the low osteoblast differentiation capacity of hBMSC.

• Journal of Periodontal and Implant Science
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• 제25권2호
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• pp.192-209
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• 1995

The purpose of this study was to evaluate drug-loaded biodegradable membranes for guided tissue regeneration(GTR). The membranes were made by coating mesh of polyglycolic acid(PGA) with polylactic acid(PLA) containing 10% flurbiprofen or tetracycline. The thickness of membrane was $150{\pm}30{\mu}m$, and the pore size of surface was about $8{\mu}m$ in diameter. The release of drugs from the membrane was measured in vitro. Cytotoxity test for the membrane was performed by gingival fibroblast cell culture, and the tissue response was observed after implant of membrane into the dorsal skin of the rat for 8 wks. Ability to guided tissue regeneration of membranes were tested by measuring new bone in the calvarial defects(5mm in diameter) of the rat for 5 weeks. The amount of flurbiprofen and tetracycline released from membrane were about 30-60% during 7 days. Minimal cytotoxity was observed in the membrane except 20% drug containing membrane. In histologic finding of rat dorsal skin, many inflammatory cells were observed around e-PTFE, polyglactin 910 and PLAPGA membrane after 1 or 2 weeks. PLA-PGA membrane was perforated by connective tissue after 4 or 6 weeks, and divided as a segment at 8 weeks. In bone regeneration guiding potential test, tetracycline loaded membrane was most effective (p

• Journal of Periodontal and Implant Science
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• 제25권2호
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• pp.321-340
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• 1995

The regeneration of destructed periodontal tissues is one of the ultimate objectives of periodontal therapy. Guided tissue regeneration technique was developed for the ideal regeneration of periodontal tissues. In order to investigate the role of fibronectin, laminin and tenascin in the regenerating process of periodontal tissues, the expanded PTFE barrier membranes(Gore Associates, USA) removed from the patients who had been treated by guided tissue regeneration(GTR) and guided bone regeneration(GBR) techniques were fixed in neutral formalin for 6-24 hours, embedded with paraffin, sectioned at $4-6{\mu}m$ in thickness, and immunohistochemically processed by Avidin-Biotin peroxidase complex method for detecting fibronectin, laminin and tenascin. Monoclonal mouse anti-human fibronectin antibody(Oncogene Science, USA., 1:100), monoclonal mouse anti-human laminin antibody(Oncogene Science, USA., 1:50) and mouse anti-human tenascin antibody(Oncogene Science, USA, 1:10) were used as primary antibodies. The light microscopic findings were as follows: (1) The distribution of fibronectin, laminin and tenascin was various according to the area of barrier membranes. (2) The distribution of fibronectin in case of GBR was extensive in the tissue on the outer surface of barrier membranes, and rare in the intervening space and on the inner surface. In case of GTR it was extensive on the outer surface and in the intervening space, and rare on the inner surface. (3) The distribution of laminin was rare in the tissue on the outer, the inner surface and intervening space of barrier membranes, regardless of GBR or GTR. (4) In case 'of GBR rare distribution of tenascin was observed on the outer surface only, except the inner surface and the intervening space of barrier membranes. In case of GTR the distribution of tenascin was extensive in the tissue on the outer surface, rare in intervening space and the inner surface. The results suggest that fibronectin, laminin and tenascin may play a important role in the regenerating process of periodontal tissue, and they may affect the outcome of healing.

• Journal of Periodontal and Implant Science
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• 제25권2호
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• pp.341-356
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• 1995

The purpose of this study was to evaluate the effect of demineralized freeze dried bone and demineralized bone gel with guided tissue regeneration treatment around titanium implants with dehisced bony defects and also evaluate space maintaining capacity of demineralized bone gel type and DFDB powder type under e-PTFE membrane. In 3 Beagle dogs, mandibular premolar was extracted and four peri-implant osteotomies were formed for dehiscence. After insertion of implants, the four peri-implant defects were treated as follows. 1) In control group. no graft material and barrier membrane were applied. 2) In experimental group.1, the site was covered only with the e-PTFE membrane. 3) In experimental group 2,received DFDB powder and covered by the e-PTFE membrane. 4) In experimental group 3, demineralized bone gel and e-PTFE membrane were used. By random selection, animals were sacrificed at 4, 8, 12 weeks. The block sectioned specimens were prepared for decalcified histologic evaluation(hematoxylin and eosin staining) and undecalcified histologic evahiation(Von Kossa's and toluidine blue staining) with light microscopy. The results of this study were as follows. 1) In control group, there was a little new bone formation and connective tissue was completely filled in the defect area. 2) Experimental group 1 showed lesser quantity of bone formation as compared to the bone grafted group. Thin vertical growth of new bone formation around implant fixture was shown. 3) Experimental group 2 showed thick bucco-lingual growth of new bone formation and grafted bone particles were almost resorbed in 12 week group. 4) In experimental group 3, most grafted bone particles were not resorbed in 12 week group and thick bucco-lingual bone formation was shown in dehisced defect base area. 5) There was no remarkable differences in space making capacity and new bone formation procedure between demineralized freeze-dried bone powder type and demineralized bone gel type.

• Journal of Periodontal and Implant Science
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• 제25권2호
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• pp.407-417
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• 1995

In order to evaluate the effect of platelet-derived growth factor(PDGF-BB) and guided tissue regeneration(GTR) technique on the regeneration of destructed periodontal tissue,intentional through-and-through furcation defects(4mm in height) were made on both mandibular 2nd and 4th premolars of 8 adult male dogs(30-40lb). Experimental group 1 was composed of the premolars that were treated by only topical application of PDGF-BB with 0.05M acetic acid without any barrier membrane. Experimental group 2 was composed of the premolars that were treated by GTR with expanded polytetrafluoroethylene membrane(ePTFE : Gore-tex periodontal material, USA). Experimental group 3 was composed of the premolars that were treated by GTR with ePTFE after topical application of PDGFBE. Control group was composed of the premolars that were treated by coronally positioned flap operation only without use of PDGF-BB and ePTFE membrane. All ePTFE membranes were carefully removed 4 weeks after regenerative surgery, and all experimental animals were sacrificed 8 weeks after regenerative surgery. The light microscopic findings were as follows ; (1) In experimental group 1, rapid new bone formation along the-root surface with multiple ankylosis and root resorption by multinucleated giant cells, and dense connective tissue in the central portion of the furcation defects were observed. (2) In experimental group 2, it was observed that the furcation defects were filled with newly formed bone, Sharpey's fibers were embedded into new cementum on root dentin of furcation fornix area, but the central portion and the area under furcation fornix were still filled with dense connective tissue. (3) In experimental group 3, the furcation defects were regenerated with newly formed dense bone and regular periodontal ligament with Sharpey's fibers embedded into newly formed cementum and bone underneath fornix area. (4) In control group, unoccupied space, apical migration of epithelium, dense infiltration of inflammatory cells in subepithelial connective tissue in relation to heavy plaque accumulation, and root resorption by inflammatory reaction were shown, but any new cementum formation on resorbed dentin surface could not be observed. The present study demonstrated that the combined therapy of PDGF-BB and GTR could enhance the regeneration of destructed periodontal tissue.

• 식물조직배양학회지
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• 제21권6호
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• pp.333-339
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• 1994

연초의 약배양에 의해서 반수체를 유기하고 형성된 반수체와 이배체의 캘러스로부터 식물체 분화과정에서 일어나는 생리적 차이점을 비교하고자 효소의 활성도와 페놀화합물의 함량을 비교 조사하였다. 반수체의 형성은 화아가 중간정도된 크기를 이용하여 IAA가 1.0 mg/L kietin이 0.5mg/L 조합 처리되고 활성탄이 3 mg/L 함유된 배지에서 가장 양호하였다. 캘러스의 유도는 이배체 및 반수체 공히 2,4-D의 농도가 0.5 mg/L 첨가된 배지에서 양호하였으며, 캘러스로부터 재분화는 BAP 농도 2.0 mg/L에서 효과적이었다. 재분화시 변화되는 효소의 활성도와 페놀화합물의 함량은 처리된 BAP의 농도와 사용한 식물체에 따라 차이가 있었다. Peroxidase의 활성도는 이배체 및 반수체 공히 BAP 농도가 2.0 mg/L일때 가장 높았으며, catalase의 활성도는 BAP의 농도가 1 mg/L일때 가장 높은 경향을 보였다. IAA oxidase 및 catalase의 활성도는 이배체에 비해 반수체에서 더 높은 경향을 보였으나 peroxidase의 활성도는 이배체가 더 높은 경향을 나타내었다.

• 식물조직배양학회지
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• 제27권1호
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• pp.13-18
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• 2000

고등식물에 있어서 엽록체에 존재하는 저 분자량 HSP의 기능을 밝히기 위하여 담배 (Nicotina tabacum cv. Petit Havana SRI)로부터 분리한 cDNA (NtHSP21)를 도입한 형질전환 담배 식물체를 재생하였다. 상온에서의 발현량이 서로 다른 5개의 순계 형질전환 식물체를 선발하였다 상온에서 발현된 엽록체 small HSP가 식물의 고온내성에 미치는 영향을 조사하기 위하여 기내에서 생장시킨 유식물을 52$^{\circ}C$에서 45분간 열처리한 후 생장온도에서의 변화를 조사하였다. 그 결과 wild-type식물의 경우 1주일 이내에 모두 고사하였으나 형질전환 식물체의 약 70%는 생존하였다. 또한 이러한 고온내 성은 상온에서 발현된 단백질의 양에 비례하여 증감하였다. 따라서 엽록체에 존재하는 small HSP가 식물의 고온내성 획득에 있어서 중요한 역할을 담당할 것으로 사료된다.

• 식물조직배양학회지
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• 제25권6호
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• pp.495-500
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• 1998

인삼(Panax ginseng C. A. Meyer) 캘러스로부터 분리한 원형질체를 배양하면서 배양시간에 따른 원형질체의 미세구조 변화와 원형질막 표면을 전자현미경으로 조사하였다. 3일 동안 배양된 원형질체에서는 조면소포체, 리보좀, 골기체, 미토콘드리아, 전색소체 등의 세포기관들의 수가 증가하였고 미소관도 관찰되었다. 골기체 주변에는 많은 골기소낭들이 형성되어 세포질 전반에 존재하였고, 이들 소낭들은 원형질막 바깥으로 돌출되어 돌기를 형성하기도 하였다. 소포체에서 유래된 액포속에는 액포의 함입에 의하여 골기소낭들이 들어 있는데, 이들 액포들은 융합에 의한 exocytosis로 원형질막 근처로 이동하여 원형질막과 융합한 다음, 세포벽 물질을 원형질막 바깥으로 방출하여 원형질막에 침적하였다. 전색소체는 많은 전분립을 함유하고 있었고, 미소관들은 원형질막 근처에서 막과 평형으로 배열하고 있었다. 배양된 원형질체의 표면에는 섬유소로 구성되어 있는 원섬유들이 서로 연결되어 있는 것이 관찰되었다.