표피 종양에서 Epidermal Growth Factor Receptor의 발현 비교

송준영,이규석,정재봉 啓明大學校 醫科大學 1994 계명의대학술지 Vol.13 No.4

Epidermal growth factor(EGF) and transforming growth factor alpha(TGFα) are important keratinocyte mitogens. Their effect are mediated by a cell membrane receptor(EGFR), quantitive and qualitive abnormalities of which may be responsible for deranged keratinocyte proliferation and differentiation. We have therefore examined EGFR expression immunohistochemically in a variety of benign and malignant epithelial neoplasms using monoclonal antibodies to the extracellular and intracellular receptor domains, In benign tumor(seborrheic keratosis), there was an ordered pattern of EGFR expression. In malignant tumors(basal and squamous cell carcinoma), there was loss of membrane labelling and cytoplasmic accumulation of the receptor. In premalignant prolifertation(Bowen's disease), there was loss of membrane receptor with absent cytoplasmic EGFR. In slot-blot analysis, the levels of EGFR mRNA in sguamous cell carcinoma and basal cell carcinoma revealed 3 fold elevation when compared to normal skin. We suggest that dysregulation of the EGFR may be important in the development of cutaneous epithelial malignancies.

腎皮質 S-Adenosyl-L-Methionine : Protein-Carboxyl O-Methyltransferase에 關한 硏究 Protein-Carboxyl O-Methyltransferase from Bovine Renal Cortex

宋晩秀,林圭,黃炳斗,李載欣 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2

S-Adenosyl-L-methionine : protein-carboxyl 0-methyltransferase (EC 2.1. 1. 24, protein methylase II) was purified from bovine renal cortex approximately 6, 780-fold with a 9% yield by combination of ammonium sulfate precipitate, Sephadex G-75 chromatography, S-adenosyl-L-homocysteine-sepharose 4B chromatography and hydroxyapatite chromatography, and then its properties and physiological role were investigated. 1. The enzyme showed a pH optimum around 5.6-6. 0. It is heat labile, inactivated by heattreatment for 3 minutes at 60℃, and when stored at -20℃ in the presence of 10% glycerol, its activity has been almost stable in a month. 2. Copper ion (Cu^2+}) and zinc ion (Zn^2+) were a potent inhibitors, the activity being completely inhibited at 2 mM. The inhibition of copper and zinc ions were recovered 85%and 63% of its activity adding of 4 mM EDTA, respectively. The inhibition of copper ion was completely recovered by adding of 10 mM mercaptoethanol, but zinc ion did not almost affect. 3. The apparent Km value for S-adenosyl-L-methionine was 4 x 10^-6M. Kinetic analysis of the enzyme in the presence of 25 uM copper ion showed that the nature of the inhibition to the enzyme was noncompetitive, considering that Km was constant and Vmax was decreased, and 50uM zinc ion showed that it was uncompetitive, considering that both Km and Vmax were decreased. 4. Immunoglobulin A, histone II and histone H3 were relatively good substrates for the enzyme. 5. The enzyme activity was completely inhibited by 0.4 mM of p-hydroxymercuribenzoic acid, but all of the activity was recovered in adding 10 mM mercaptoethanol, and the molecular weight of the enzyme was 24, 000. 6. The carboxylmethylated fractions of the brush-border membrane of bovine renal cortex had molecular weight of 70,000, 67,000, 45,000, 40,000, 31,000 and 27,000 etc. (6 fractions), as determined by SDS/polyacrylamide gel electrophoresis. 7. The carboxylmethylation of the brush-border membrane increased with time, S-adenosylmethionine, substrate concentration, and methylated brush-border membrane was demethylated by 50% for 10 minutes at pH 7.4. 8. D-Glucose uptake was inhibited by carboxylmethylation of brush-border membrane. These results suggest that protein methylase II may play some roles in regulating physiological function of brush-border membrane.

국내의 Acinetobacter baumannii와 Pseudomonas aeruginosa 임상분리주에 대한 Colistin과 Polymyxin B의 감수성 양상

송원근,이태재,박민정,김한성,김재석,우흥정,이규만 대한감염학회 2006 감염과 화학요법 Vol.38 No.6

배경 : 다약제 내성 Acinetobacter baumannii와 Pseudomonas aeruginosa에 의한 감염의 증가로 인해 기존의 치료제를 대신할 수 있는 colistin이나 polymyxin B와 같은 대체 항균제들이 사용되고 있다. 이에 국내에서 분리된 A. baumannii와 P. aeruginosa에 대한 colistin과 polymyxin B의 감수성 현황을 알아보고자 하였다. 재료 및 방법 : 국내 5개 대학병원에서 분리된 균주 중 ceftazidime과 imipenem의 감수성에 따라 93주의 A. baumannii와 99주의 P. aeruginosa를 선택하였다. 액체배지 미량희석법으로 colistin과 polymyxin B의 감수성을 시험하였다. 결과 : Ceftazidime과 imipenem이 감수성인 균주에서는 기타 β-lactam제, aminoglycoside제 및 ciprofloxacin에 대한 감수성율(각각 58-100%, 50-100%, 75-100%)이 높았으나, ceftazidime 또는 imipenem이 내성인 균주에서는 위의 항균제에 대한 감수성율이(각각 ≤31%, ≤47%, ≤18%)이 낮았다(P<0.05). Colistin과 polymyxin B에 대한 A baumannii (MIC_(50/90), 1/2 ㎍/mL)와 P. aeruginosa(MIC_(50/90), 1/1 ㎍/mL)에의 항균 범위는 거의 유사하였고 두 약제 모두 매우 우수한 항균력을 보였다. A. baumannii에서는 1주(1.1%)가 colistin 내성(MIC, 4 ㎍/ mL)이 었으나 polymyxin B에는 감수성(MIC, 2 ㎍/mL)이었으며 이외의 모든 A. baumannii와 P. aeruginosa는 colistin과 polymyxin B에 감수성(MIC, ≤2 ㎍/mL)이었다. 결론 : 국내에서 colistin과 polymyxin B에 둘 다 내성인 A. baumannii나 P. aeruginosa 감염은 없었다. 따라서polymyxin제를 다약제 내성 A. baumannii나 P. aeruginosa 감염에 대한 대체 항균제로 유용하게 사용할 수 있을 것으로 생각된다. Background : The emergence of multidrug-resistant Acinetobacter baumannii and Pseudomonas aeruginosa has become a major problem. The use of nontraditional agents such as colistin and polymyxin B have been tried. The purpose of this study was to evaluate the colistin and polymyxin B susceptibility of A. baumannii and P. aeruginosa isolates in Korea. Materials and Methods : According to susceptibility of ceftazidime and imipenem, selected 93 isolates of A. baumannii and 99 isolates of P. aeruginosa were collected from 5 university hospitals in Korea. Susceptibility to colistin and polymyxin B was tested using the reference broth microdilution method. Results : The rates of other β-lactams, aminoglycosides, and ciprofloxacin susceptibility were high (58-100%, 50-100%, and 75-100%, respectively) in ceftazidime- and imipenem-susceptible isolates but were low (≤31%, ≤47%, and ≤18%, respectively) in ceftazidime- or imipenem-resistant isolates (P<0.05). Colistin and polymyxin B displayed a nearly identical spectrum of activity, exhibiting excellent potency against A. baumannii (MIC_(50/90), 1/2 ㎍/mL) and P. aeruginosa (MIC_(50/90), 1/1 ㎍/mL). Only one of the A. baumannii isolates was resistant to colistin (MIC, 4 ㎍/mL), but the isolate was susceptible to polymyxin B (MIC, 2 ㎍/mL). Conclusion : In Korea, no A. baumannii and P. aeruginosa isolates were resistant to both colistin and polymyxin B. These data suggested that polymyxins may be alternative drugs for multidrug- resistant A. baumannii and P. aeruginosa isolates.

정상 인체 멜라닌세포 및 B-16 흑색종 세포주에서 상지(桑枝) 추출물의 티로시나제 활성 억제 효과에 관한 연구

송무현,황재영,박영립,황규왕 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

Background : Recently, the undesirable effects of UV exposure have been increasing because of destruction of ozone layer and excessive solar exposure in enjoying leisure. Therefore, the chance to have uneven skin pigmentations has been increasing. To keep away from the unwanted skin pigmentation, melanogenesis inhibitors have been developed for use in cosmetic preparations for the purpose of skin whitening. Plant extracts having an inhibitory effect in melanin synthesis may be a good choice as a cosmetic ingredient because they have relatively fewer side effects. Objective : In this study, the inhibitory effects of ramulus mori (young twigs of Morus alba L) on tyrosinase activity were investigated cultured normal human melanocytes and B-16 melanoma cells by using enzyme assay and RT-PCR. Methods : Tyrosinase activity was determined by spectrophotometry. The effects of whitening agents (kojic acid, arbutin, licorice extracts and ramulus mori extracts) on mushroom tyrosinase was compared by measuring the IC_(50), the concentration of the compound at which half of the original tyrosinase activity is inhibited. Normal human melanocytes taken from neonatal foreskin and B-16 melanoma cells, tyrosinase activity inhibition was measured by spectrophotometry. We observed tyrosinase volume in B-16 melanoma cells by using PT-PCR. Results : Ramulus mori extracts showed strong inhibitory effect on tyrosinase activity in both normal human melanocytes and B-16 melanoma cells. We also confirm that they have a inhibitory effect on tyrosinase expression in the RT-PCR. Conclusion : This study showed that ramulus mori extracts had strong inhibitory effect against tyrosinase activity. The results suggests that ramulus mori extracts can be used as a new whitening agent.

질소오염 감소를 위한 질소수지표 개발에 관한 연구 : 충청북도 사례연구 For Province Chungcheongbuk-do

송재옥,홍성규 建國大學校 自然科學硏究所 2004 建國自然科學硏究誌 Vol.15 No.-

These days, the environment has been polluted as a result of many kinds of agricultural activities, such as over-fertilization and excessively injected agricultural medicine and livestock-wastewater. Especially, superfluously used nitrogenous fertilizers have worsened both ground water and earths surface water. In Korea, compared to other developed countries, there has been an extensive use of nitrogenous fertilizer, affecting the cleanliness of ground water. Under these circumstances, it is imperative to study the pollution by nitrogenous fertilizer. In order to estimate the extent of potential pollution by nitrogenous fertilizer, this study establishes a nitrogen parameter by providing the balance between the inputted quantity of nitrogen element (marked as plus) and the output quantity of nitrogen element (marked as minus). For the calculation of surface nitrogen balance, nitrogen input was calculated by fertilizer consumption and cattle manure input etc., and nitrogen output was mainly harvested crop products. This balance, by indicating the extent of potential pollution, may be used to improve the effectiveness of environment policy making. In Province Chungcheongbuk-do(Chungbuk), a surplus of nitrogen is 15.3kg/10a. However, each region has different levels of surplus based on the amounts of nitrogenous fertilizer used, soil and climate. We observe that the policy to reduce pollution by nitrogen must be applied based on environmental characteristics of each region. In conclusion, the nitrogen parameter has significance in planning environmental policy that is appropriate to each region, by helping to analyze the effect on rural household income and to solve other environment-related problems.

Pseudomonas aeruginosa와 Acinetobacter baumannii에 대한 Imipenem, Panipenem 및 Meropenem의 시험관내 항균력 비교

송원근,우흥정,강희정,김재석,박민정,이규만 대한화학요법학회 2002 대한화학요법학회지 Vol.20 No.3

목적 : Pseudomonas aeruginosa와 Acinetobacter baumannii는 중요한 병원감염균으로 알려져 있으며 다약제 내성을 잘 유발한다. 최근 들어 전 세계적으로 carbapenem제에 대한 감수성이 떨어지고 있어 문제가 되고 있다. 이에 저자들은 한국에서 분리된 P. aeruginosa와 A. baumannii를 대상으로 imipenem, panipenem 및 meropenem의 항균력을 비교하고자 하였다. 방법 : 150주의 P.aeruginosa (imipenem 감수성, 62주; imipenem 내성. 88주)와 53주의 A.baumannii (imipenem 감수성, 9주; imipenem 내성 44주)를 대상으로 National Committee for Clinical Laboratory Standards의 기준에 따라 미량액체배지희석법으로 imipenem, panipenem. meropenem에 대한 최소억제농도(MIC)를 측정하였다. 결과 : 총 150주의 P. aeruginsa 균주의 MIC_50/MIC_90은 imipenem, panipenem 및 meropenem이 각각 16/64, 16/64 및 4/32㎍/mL이었다, 53주의 A.baumannii 균중의 MIC_50/MIC_90은 imipenem, panipenem 및 meropenem이 각각 32/64, 32/64 및 16/32 ㎍/mL이었다. 88주의 imipenem 내성 P. aeruginosa 균주 중 33주 (38%)는 감수성 결과를 보였으나 그 반대의 결과를 보인 경우는 없었다. 결과 : MIC 결과 상 imipenem에 내성인 P. aeruginosa와 A. baumannii에 대하여 meropenem이 impenem이나 panipenem보다 좀더 강한 활성이 있음을 알 수 있었다. Background : Pseidomonas aeruginosa and Acinetobacter baumannii are important nosocomial pathogens. Many strains are multi-drug resistant, with decreased susceptibility to carbapenem emerging worldwide. We investigated the in vitro activity of imipenem, panipenem, and meropenem against P. aeruginosa and A. baumannii isolates in Korea. Methods : One hundred and fifty strains of P. aeruginosa (imipenem-susceptible, 62strains; imipenem-resistant, 88 strains) and 53 strains of A baumannii (imipenem-susceptible, 9 strains; imipenem-resistant, 44 strains) were examined. Minimal inhibitory concentration (MIC) testing for imipenem, panipenem, and meropenem was performed using the broth microdilution method as described by the National Committee for Clinical Laboratory Standards. Resilts : The MIC_50/MIC_90 of imipenem, panipenem, and meropenem against the clinical isolates were: 16/64, 16/64, and 4/32 ㎍/mL, respectively, against P. aeruginosa; 32/64, 32/64, and 16/32 ㎍/mL against A. baumannii. 33 (38%) of the 88 strains of impenem-resistant P. aeruginosa were susceptible to meropenem but the reverse was observed in none. Conclusion : The MIC data showed that meropenem was more active than imipenem and panipenem against imipenem-resistant P. aeruginosa and A. baumannii isolates.

브러시리스 직류 전동기의 센서리스 고속 특성 개선

송명현,박규남,우혁재 順天大學校 1998 論文集 Vol.17 No.1

This study applies sensorless strategy that is based on detecting of terminal voltages for sensing the rotor position in real time. And, by providing high PWM frequency, a current ripple and a torque pulsation are removed. Also, and accuracy of position detection at high speed are improved and a high speed operation range is expanded. The sensorless driving system is implemented with an IPM module and 87C196MC one-chip microcontroller. For confirming the validity of the proposed methods. experimental results from a prototype motor of rating 300W have shown. From the results of experiment, the Performance characteristics of high speed operation for permanent magnet brushless DC motor (BLDCM) driving systems are improved.

독시사이클린 나노입자가 함유된 치주용 키토산 스트럽의 제조 및 특성

송경숙,양재헌,김영일,정규호 한국약제학회 2001 Journal of Pharmaceutical Investigation Vol.31 No.4

Local drug delivery by using biocompatible polymers has been developed in the treatment of periodontitis for many years. In the field of dental therapy, doxycycline is usually a first choice because of its broad-spectrum antibiotic activity. The strip releases antibiotics for a week, and the polymer should be degradable after a week. In this study, we prepared and evaluated the chitosan strips and nanoparticle strips containing doxycycline hydrochloride, and studied their antiacterial activity, dissoultion, and degrability in vitro. The weight of cast strip containing a 5 mg of doxycycline hydrochloride and a 45 mg of chitosan polymer was 57.67±0.17 mg. The release rate of doxycycline hydrochloride from the strip was measured by HPLC. The drug released from chitosan strip and nanoparticle strip was shown to be 50 ㎍/ml, in first 24 hours. In antibacterial test showed growth inhibitory activity after 24 hrs anaerobic incubation. In vitro degradability showed demolished weight of 93.74±0.08% chitosan strip, 82.48±1.29% chitosan nanoparticle strip, 2.47±1.99% polycarprolactione strip (control). These results showed that, with this doxycycline hydrochloride strip, it is feasible to obtain a sustained release of the drug within the periodontal pocket for seven days which may be improve for local drug delivery system for treatment of periodontal disease.

HL-60 세포주를 이용한 결핵균항원의 세포성면역반응의 분석

박정규,강윤중,김운옥,임재현,송창화,조은경,김화중 충남대학교 의학연구소 2001 충남의대잡지 Vol.28 No.2

Most persons who become infected with M. tuberculosis mount a protective immune response and remain clinically well, the only evidence of infection being development of a positive tuberculin skin test. Five to 10% develop tuberculosis disease within the first 2 years after infection (primary tuberculosis) or thereafter (reactivation tuberculosis). Acquired resistance against tuberculosis paradigmatically rests on cell-mediated immunity, with the major factors being mononuclear phagocytes and T Lymphocytes. While the former cells act as the principal effectors, the latter ones serve as the predominant inducers of protection. The usefulness of the single dose of BCG routinely given in childhood in many developing countries in preventing far more commonly occurring tuberculosis in adults is in doubt. An effective and safe vaccine against tuberculosis is sorely needed. A subunit vaccine are capable of inducing protective immunity and could have substantial advantages over BCG or other whole-bacterium vaccines. The human promyelocytic cell line HL-60 adopted characteristic macrophage-like properties, including adherence and CD14 expression after a period of continuous culture at high ambient CO_(2) concentration. When HL-60 cells were cultured with 1,25-dihydroxyvitamin D_(3) for 4 days, the cells acquired the activity to potentiate T cell proliferation by the 30 kDa or 38 kDa antigen of Mycobacterium tuberculosis H37Rv Therefore, vitamin D-treated HL-60 cells showed the function of the antigen presenting cells.

결핵균 30 kDa 항원과 Triton X-100 Solubilized Protein 항원에 의한 대장암 주변 림프절 단핵구의 활성화

박정규,김광호,조은경,임재현,민들레,송영자,김화중,백태현 忠南大學校 癌共同硏究所 1998 癌共同硏究所 硏究誌 Vol.2 No.1

Tumor-draining lymph node mononuclear (TDLMN) cells are specifically sensitized to the growing tumor but such cells are deficient for mediating an antitumor response. In this study, we examined the feasibility of using mycobacterial 30 kDa or Triton X-100 solubilized protein (TSP) antigen to stimulate mononuclear cells of colon cancer-draining lymph node for the generation of cell mediated immune effector cells. The proliferative response of TDLMN cells stimulated with mycobacterial 30 kDa or TSP antigen was determined by ^(3)H-thymidine incorporation assay. The proliferation of TDLMN cells to mycobacterial 30 kDa or TSP antigen was significantly increased in PPD (+) patients, but a poor response to the 30 kDa or TSP antigen was observed in PPD (-). The expression on γδ T cells to mycobacterial 30 kDa or TSP antigen was assessed by flow cytometry. The γδ T cells from PPD ( + ) patient responded only to 30 kDa antigen but to TSP antigen. An investigation of cytokine mRNA expression was undertaken using reverse transcription-polymerase chain reaction (RT-PCR) to follow TDLMN cells stimulated with the 30 kDa or TSP antigens for 5 days. The IFN-γ and TNF-α mRNA expression was only induced in TDLMN cells of PPD ( + ) patient in response to the 30 kDa or TSP antigen. The IL-2 mRNA expression was induced in both PPD (+) and PPD (-) in response to the 30 kDa or TSP antigen. But the IL-4 mRNA expression was not induced in response to the 30 kDa or TSP antigen. These results suggest that the 30 kDa and TSP antigens may serve as biologic response modifier for the generation of cell mediated immune effector cells.