노화가 인체 중간엽 줄기세포로부터 조골세포로의 증식 및 분화에 미치는 영향

백기현,태현정,오기원,이원영,조정기,권순용,강무일,차봉연,이광우,손호영,강성구,김춘추 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.3

연구배경: 일반적으로 골다공증과 연관된 위험인자로는 연령, 폐경, 약물, 불충분한 칼슘섭취, 만성질환 및 운동부족 등이 있는데, 특히 노화가 진행할수록 골밀도가 감소하는 것은 잘 알려져 있다. 노화와 관련하여 진행되는 골소실은 조골세포 및 전구조골세포의 기능적 결핍에 의한 골형성의 감소가 주요한 요인으로 여겨지고 있다. 그 동안 연령이 조골모 세포의 양과 조골모 세포로부터 성숙조골세포로의 분화 및 증식에 미치는 영향에 대한 일부 보고들이 있었으나 아직 일치된 견해는 없는 형편이다. 방법: 다양한 연령의 사람으로부터 골수를 채취, 중간엽 줄기세포가 포함된 단핵세포를 분리한 후 조골세포로 분화하기 좋은 조건하에서 배양하였다. 대상군은다시 젊은군과 노령군으로 구분하여 다양한 변수를 비교 분석하였다. 일차배양에서는 CFU-F를 계수하여 골수내 중간엽 줄기세포의 수를 추산하였고, 칼슘측정을 통하여 기질의 무기화 정도를 비교하였다. 계대배양후 이차배양에서는 시기별로 알카리성 포스파타제 활성도를 측정하고 오스테오칼신 mRNA의 발현을 관찰하여 젊은군과 노령군 사이의 증식능 차이를 비교하였다. 또한 이차배양 시기별로 MTT 측정을 하여 양군간에 증식능 차이가 있는지 알아보았다. 결과: 1. 일차배양 15일째에 평균 CFU-F의 수는 젊은군에서 유의하게 많았다(젊은군 148.3±28.9, 노령군 54.3±9.1, p=0.02). CFU-F의 평균면적은 젊은군에서 넓은 경향을 보였으나 통계적으로 유의하지는 않았다. 2. 일차배양 17일 경과 후 양군간에 기질 칼슘 침착정도는 유의한 차이를 보이지 않았다(젊은군 103.6±50.6, 노령군: 114.0±56.5, p=NS). 3. 이차배양 10일째에 젊은군에서 알카리성 포스파타제 활성도가 고령군에 비해 유의하게 높았다(젊은군: 935.5±115.0 U/mg, 노령군: 578.4±115.7U/mg,p.0.05). 고령군에서는 시간 경과에 따른 변화가 미약했으며 전반적으로 알카리성 포스파타제의 활성도가 젊은군에 비해 낮았다. 4. 이차배양도중 오스테오칼신 mRNA의 발현은 배양시기별로 젊은군에 비해 고령군에서 더 낮은 경향을 관찰할 수 있었다. 5. 이차배양 10일과 15일에 젊은군에서 노령군보다세포증식이 유의하게 증가된 양상을 보였다(10앓 젊은군 0.73±0.05, 노령군 0.58±0.04, p=0.05, 15일; 젊은군 0.80±0.05, 노령군 0.70±0.03, p=0.05).결론: 이상의 연구에서 저자들은 노령군에서 젊은군보다 골수 내 중간엽줄기세포의 수가 적고, 노령군에서 유래한 전구조골세포의 성숙조골세포로의 증식 및 분화가 젊은군 보다 감소해 있는 것을 관찰할 수 있었다. Background: Osteoblasts originate from osteoprogenitor cells in bone marrow stroma, termed mesenchymal stem cells (MSCs) or bone marrow stromal cells. Each MSC forms colonies (colony forming units-fibroblasts [CFL-Fs]) when cultured ex vivo. There are some reports about the age-related changes of the number and osteogenic potential of osteoprogenitor cells, but any relationship has not been clearly established in humans. In this study, we counted MSCs using CFU-Fs count and examined the proliferative capacity and differentiation potential of osteoprogenitor cells. Finally, we analyzed how these parameters varied with donor age. Methods: Bone marrow was obtained from the iliac crest of young (n=6, 27.2±8.6 years old) and old (n= 10, 57.4k6.7 years old) healthy donors. Mononuclear cells, including MSCs, were isolated and cultured in osteogenic medium. In primary culture, we compared the colony-forming efficiency of MSCs between the two groups and determined the matrix calcification. When primary culture showed near confluence, the cells were subcultured. Alkaline phosphatase activity, osteocalcin expression by RT-PCR and proliferative potential by MTT assay were examined by the time course of secondary culture. Results: At the 15th day of primary culture, the mean number of CFU-Fs was significantly higher in the younger donors (young: 148.3±28.9, old: 54.3±9.1, p=0.02) and the mean size of CFL-Fs was also larger in the younger donors than the older donors. However, matrix calcification was not different between the two groups (young: 103.6±50.6, old: 114.0±56.5, p=NS). In secondary culture, alkaline phosphatase activities were significantly lower in the older donors. The younger donors showed peak alkaline phosphatase activity at day 10, while the older donors didn't showed a remarkable peak (young: 935.5±115.OU/mg, old: 578.4±115.7U/mg, p<0.05). Total cell number as a proliferative index increased progressively during the secondary culture and a significantly greater cell number was noted in the younger donors. Osteocalcin expression was generally upregulated in the younger donors, but this was not statistically significant. Conclusion: Our study shows that the number of osteoprogenitor cells is decreased during aging and that the proliferative capacity and differentiation potential of osteoprogenitor cells seem to be reduced during aging (J Kor SOC Endocrinol 18:296-305, 2003).

부산지역 무균성 뇌막염 원인 바이러스의 분리 및 동정 : 1998년을 중심으로

김영희,정영기,김기순,지영미,윤재득,김병준,구평태,민상기,정구영,김만수,조경순 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1

The incidence of aseptic meningitis infection is ensuing and threatening the health of children. Enteroviruses are the major agents of aseptic meningitis and identification of virus has been a clue to diagnosis and epidemiology. The outbreak of aseptic meningitis occurred in Pusan, 1998. Patients were concentrated from April through November. Children were more susceptible than adults. Among 306 cases of specimens from stool, throat swab tested, only 7.2% were positive on virus isolation, 12 cases from stool and 10 from throat, respectively. All isolated 7 serotypes of viruses represented cytopathic effect on cultured cells. Three types of echovirus 6, 25, 30 and coxsackievirus B2, B3, B4, B6 were identified by neutralizing anti body test. Isolated coxsackievirus and echovirus were observed by an electron microscope with negative staining.

척수 경막에 발생한 Sarcoidosis

김영신,양기화,김병기,김선무 대한병리학회 1991 Journal of Pathology and Translational Medicine Vol.25 No.2

두 개 학교에서 동시에 발생한 SRSV 감염증의 역학적 양상 및 바이러스의 유전적 양상

기현균,정영화,정재근,서진종,김선희,기혜영,천두성,지영미,하동룡 대한감염학회 2003 감염과 화학요법 Vol.35 No.2

배경 : SRSV는 바이러스에 의한 설사의 주요 원인병원체이다. 그러나 SRSV가 집단 식중독의 원인 병원체로 발견된 경우는 많지 않으며 특히 일정한 지역사회 내에서의 바이러스의 유전적인 다양성에 대한 연구는 없는 상황이다. 이러한 점에 착안하여 저자 등은 2개 학교에서 같은 시기에 동시에 발생한 SRSV 식중독의 역학적인 양상을 기술하며 식중독에서 나타난 SRSV의 유전학적인 변이를 기술하고자 한다. 방법 : 학교에서의 조사를 위하여 집단 식중독이 발생한 두 학교의 학생을 면접하여 인구학적 자료, 증상여부 및 증상의 종류, 섭취한 음식의 종류 등에 대하여 조사하였다. 미생물학적 검사를 위하여 4종의 세균과(Shigella spp. Salmonella spp. E. coli O157 : H7) 3종의 바이러스에 대하여 검사를 실시하였다(Norwalk agent, SRSV, adenovirus, and astrovirus). 결과 : 조사결과 두 학교에서의 증상자 수는 193명이었으며(193/2,843. 6.8%) 환자 증상일의 분포곡선은 단일정점을 보이는 양상이었다. 나타난 증상으로는 복통(176/193, 91.2%), 두통(111/193, 57.5%), 구토(102/193, 52.8%), 설사(83/193, 43.0%), 열감(79/193, 40.9%), 오심(73/193, 37.8%), 오한(49/193, 25.4%), 후중기의 순이었다(8/193, 4.1%). 실험실 검사결과 9건의 검체에서 SRSV가 PCR로 확인되었으며 RNA polymerase에 대한 DNA sequencing 결과 두 학교에서 각각 2개의 genogroup (Genogroup Ⅰ, Ⅱ)과 3개의 genotype이 발견되었다. 결론 : 본 연구결과 두 학교에서 동시에 발생한 SRSV에 의한 집단 감염증을 확인하였으며 3개의 다른 genotype을 각각의 학교에서 확인하였다. 본 연구의 의의는 같은 시기에 집단으로 발생한 SRSV 감염증이라도 서로 다른 유전형이 발견될 수 있음을 제시하였으며 추후 지역사회 및 국내에서의 SRSV 감염증에서 발견된 유전형과의 차이에 대한 연구가 진행되어야 함을 시사하는데 있다. Background: Small round structured virus (SRSV) is one of the common etiologic agents of viral gastroenteritis in childhood. However, SRSV has not easily been detected in many diarrheal outbreaks. Therefore, we experienced simultaneous outbreak of SRSV enteritis in two elementary schools, therefore, we analyzed the result of the surveillance. Methods: We interviewed the pupil of two schools and questioned their demographic data, presence of gastrointestinal symptoms, contact with symptomatic persons within the last two weeks, and dietary history within the last one week in school. The specimens of the symptomatic pupil were collected for identification of bacteria (Shigella spp, Salmonella spp, E.coli O157:H7) and viruses (Norwalk agent, SRSV, adenovirus, and astrovirus). Results: The number of symptomatic patients was 193 (193/2843, 6.8%) and the distribution of symptom onset was unipolar. Frequent symptoms of the patients were abdominal pain (176/193, 91.2%), headache (111/193, 57.5%), vomiting (102/193, 52.8%), diarrhea (83/ 193, 43.0%), febrile sense (79/193, 40.9%), nausea (73/193, 37.8%), chilling (49/193, 25.4%), and tenesmus (8/193, 4.1%). We identified SRSV in 9 cases by PCR method, and analyzed the RNA polymerase gene by DNA sequencing; 2 genogroup (Genogroup Ⅰ, Ⅱ) and 3 genotype. Conclusion: We confirmed SRSV enteritis with different genotypes in two concurrent outbreaks. DNA sequencing and comparison of genotype among the isolated SRSV in near future are be necessary

청소년 정신분열증 환자의 어머니의 단기집단 정신치료의 연구

곽영숙,백기청,고기형 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.1

To evaluate schizophrenic mothers' conflict, depression, and attitude toward their schizophrenic children and how they perceive psychiatric illness, we studied group process of nine mothers in twelve sessions. The results were as follows : 1) There was significant difference in only atmosphere of family in PBR. 3) There was partial changes in cause, treatment and perspective of disease. 4) Drop-out rate was 10.1%. 5) Late attendance rate was 2.8 persons per session and abscence rate was 0.8 person per session. 6) Group silence was 0.9 frequency per session and there was great difference to authority and style of therapist. 7) Laughter rate and crying rate were 0.6 and 0.4 frequency, respectively. 8) Familial attendance was 0.3 person per session except mothers. 9) There was overt depression during group psychotherapy. 10) Uncooperation of therapist made group process to involve only therapist. 11) Goup cohesion and universality were major group dynamics, which dependency and helplessness appeared.

LED의 구조가 전류 퍼짐에 미치는 영향

최기석,권기영 공주대학교 생산기술연구소 2001 論文集 Vol.9 No.-

In this paper, we have studied on the effect of structural parameters on current spreading in LED's

상아질에 대한 자가 산부식 접착제의 전단결합강도와 SEM 분석 비교

조영곤,노기선,김수미,이영곤,정진호,기영재 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

The purpose of this study was to compare shear bond strength and interfacial pattern of composite bonded to dentin using self-etching adhesive systems. Sixty extracted human molars with exposed occlusal dentin were divided into four groups and bonded with four adhesives and composites: Single Bond/Filtek Z 250(SB), Tyrian SPE-One-Step Plus/Aelitefil(TY), Prompt L-Lpop/Filtek Z 250(LP), and one-Up Bond F/Palfique Toughwell(OU). The results of this study were as follows; 1. Shear bond strength for OU was significantly lowet than that of other groups(p<0.05). No significant difference was founded among SB, TY, and LP. 2. Failure modes to dentin showed adhesive and mixed for SB, TY, and LP, but them for OUT showed adhesive in all spceimens. 3. Dentin-resin interface showed close adaptation for SB, TY, and LP, but it showed gap for OU. 4. The hybrid layers for TY, LP, OU were thinner than that of SB. Adhesive layers were observed between composite and hybrid layer, which were 5 ㎛ thick for TY and 10 ㎛ thick for OU.

성공적인 경피적 승모판 교련절개술 후 임상 경과와 재협착율

김영학,강덕현,송재관,최기준,이철환,홍명기,김재중,박성욱,박승정 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

만성 호중구성 백혈병 1예

박기령,조성민,우가은,이기현,손혜영,임정윤,최진혁,이순남,정화순 梨花女子大學校 醫科大學 醫科學硏究所 1997 EMJ (Ewha medical journal) Vol.20 No.2

Chronic neutrophilic leukemia(CNL) is a very rare myeloproliferative disease, characterized by sustained mature neutrophilic leukocytosis with granulocytic bone marrow infiltration, high NAP(neutrophilic alkaline phosphatase) score and absence of philadelphia chromosome, It is frequently accompanied by hepatosplenomegaly, elevated serum vitamin B_12 and uric acid level. For the diagnosis of CNL, the leukemoid reaction, especially secondary to neoplasia, infection and autoimmune diseases, should be excluded. Since Tuohy's first description in 1920, more than 50 cases fullfilling the above criteria have been reported worldwide, and 4 cases in Korea. Several authors have demonstrated the defect of intracellualr killing in the mature neutrophil and this finding correlates well with the very high incidence of fatal infection, The hemorrhagic diasthesis in CNL is caused by functional abnormality of the platelet. This disease has tendency to transform to blastic crisis and acute leukemia as in other myeloproliferative disease, but characteristically shows frequent coexistence with multiple myeloma. Until now , the therapeutic trials in CNL have been disappointing. Hydroxyrea and busulfan can control hyperleukocytosis. On the basis of functional defect in neutrophil, alpha-2b-interferon has been tried and several reports have demonstrated the clinical and functional effect of interferon on CNL. CNL is very rate hematologic disease and there are few report about general aspect of disorder. We report here a typical CNL case presenting with splenomegaly and leukocytosis with a review of the literature.

Citrobacter sp.에 의한 Triphenylmethane계 색소의 분해

민상기,조영배,전홍기 부산대학교 유전공학연구소 1995 분자생물학 연구보 Vol.11 No.-

염색공장 폐수처리장의 폭기조로부터 분리한 Citrobacter sp. SK-3균주의 생육 특성을 검토하고, triphenylmethane계 색소중 염기성 염료로 사용빈도가 높은 crystal violet을 비롯한 pararosaniline, brilliant green등에 대한 분해능을 조사하였으며, crystal violet의 분해산물을 HPLC로 추정하였다. Citrobacter sp. SK-3균주의 triphenylmethane계 색소를 분해하기 위한 최적배지 조성은 최소 무기염배지에 탄소원으로서는 galactose 0.5%, 질소원으로서는 beef extract 0.1%, 초발 pH는 8.0-9.0 였으며, 최적배지에 crystal violet 200ppm을 첨가하여 40℃ 부근에서 배양하였을 때 24시간 이내에 100%의 분해율을 나타내었다. Citrobacter sp. SK-3균주는 triphenylmethane계 색소중 crystal violet뿐만 아니라 malachite green, pararosaniline, brilliant green, methyl violet, basic fuchsin 등과, Azo계 색소인 methyl red를 분해하였다. Citrobacter sp. SK-3균주는 무기염 배지상에서 crystal violet, brilliant green을 유일한 탄소원, 질소원으로 이용하여 생육 가능하였다. Citrobacter sp. SK-3균주에 의한 crystal violet 분해산물을 TLC 및 HPLC로서 분석한 결과, crystal violet의 기본골격에 결합된 methyl기가 점차 demethylation되어 pentamethyl-, tetramethyl-, trimethyl- pararosaniline등의 물질들로 분해되어짐을 확인할 수 있었다. The optimal condition for degradation of crystal violet and other triphenylmethane dyes by Citrobacter sp. SK-3 isolated from the activated sludhe of dye manufacturing factory was investigated. The optimal culture medium for the degradation of triphenylmethane dye was composed of minimum inorganic salt medium supplemented with 0.5% galactose, 0.1% beef extract, with the initial pH of 8.0 to 9.0. Under this condition, Citrobacter sp. SK-3 degraded 200ppm of crystal violet completely within 24 hours. Citrobacter sp. SK-3 also degraded efficiently malachite green, pararosaniline, brilliant green, methyl violet, basic fuchsin and methyl red. Analysis of the degradation products of crystal violet through thin layer chromatography and high performance liquid chromatography indicated that the methyl groups bound to crystal violet backborn were gradually demethylated to pentamethyl-, tetramethyl- and trimethylpararosaniline.