• The Korean Journal of Pain
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• 제13권2호
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• pp.149-155
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• 2000

Background: Pulsed radiofrequency (RF) lesioning is a painless procedure and causes no neurodestruction and neuritis-like reaction are common following conventional RF lesioning. There is little data about the effect of pulsed RF especially with regard to its suitability for the treatment of acute pain. The possibility of a placebo effect cannot be ruled out because a double-blind study was not performed in previous studies. There is also no neuropathologic study about pulsed RF. Methods: The rats were anesthetized with sodium pentobarbital (40 mg/kg, i.p.; supplemented as necessary). The common sciatic nerve was exposed by blunt dissection through biceps femoris. Pulsed RF was administered to the common sciatic nerve using a 30 ms/s pulse with for 120 seconds. The temperature reached was no more than $42^{\circ}C$. Analgesia was determined using hot-plate assay shortly and, 3 days and 1 week before, and 2 weeks after operation. Lesions were examined with LM (light microscope) and EM (electron microscope) 2 weeks later. Results: There were no differences in response latencies between the control and experimental group. There were many vacuoles with hyaline bodies in the Schwann cell cytoplasm rather than axon in LM and larger electron dense bodies. No changes were found in the axon or unmyelinated fibers. Only small changes were found in the sheaths of myelinated fibers and Schwann cells. Conclusions: We therefore do think that any analgesic effect of pulsed RF is not a result of block of neural conduction. But rather than it can be attributed to others factors. It was also ineffective as a treatment for acute pain such as that caused by the hot-plate test.

• Biomolecules & Therapeutics
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• 제23권6호
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• pp.597-603
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• 2015

Synthetic cannabinoids JWH-018 and JWH-250 in 'herbal incense' also called 'spice' were first introduced in many countries. Numerous synthetic cannabinoids with similar chemical structures emerged simultaneously and suddenly. Currently there are not sufficient data on their adverse effects including neurotoxicity. There are only anecdotal reports that suggest their toxicity. In the present study, we evaluated the neurotoxicity of two synthetic cannabinoids (JWH-081 and JWH-210) through observation of various behavioral changes and analysis of histopathological changes using experimental mice with various doses (0.1, 1, 5 mg/kg). In functional observation battery (FOB) test, animals treated with 5 mg/kg of JWH-081 or JWH-210 showed traction and tremor. Their locomotor activities and rotarod retention time were significantly (p<0.05) decreased. However, no significant change was observed in learning or memory function. In histopathological analysis, neural cells of the animals treated with the high dose (5 mg/kg) of JWH-081 or JWH-210 showed distorted nuclei and nucleus membranes in the core shell of nucleus accumbens, suggesting neurotoxicity. Our results suggest that JWH-081 and JWH-210 may be neurotoxic substances through changing neuronal cell damages, especially in the core shell part of nucleus accumbens. To confirm our findings, further studies are needed in the future.

• Asian Pacific Journal of Cancer Prevention
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• 제14권1호
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• pp.111-116
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• 2013

Background: Cigarette smoking is the major risk factor for development of lung cancer. Identification of effects of tobacco on airway gene expression may provide insight into the causes. This research aimed to compare gene expression of large airway epithelium cells in normal smokers (n=13) and non-smokers (n=9) in order to find genes which discriminate the two groups and assess cigarette smoking effects on large airway epithelium cells.Materials and Methods: Genes discriminating smokers from non-smokers were identified by applying a neural network clustering method, growing self-organizing maps (GSOM), to microarray data according to class discrimination scores. An index was computed based on differentiation between each mean of gene expression in the two groups. This clustering approach provided the possibility of comparing thousands of genes simultaneously. Results: The applied approach compared the mean of 7,129 genes in smokers and non-smokers simultaneously and classified the genes of large airway epithelium cells which had differently expressed in smokers comparing with non-smokers. Seven genes were identified which had the highest different expression in smokers compared with the non-smokers group: NQO1, H19, ALDH3A1, AKR1C1, ABHD2, GPX2 and ADH7. Most (NQO1, ALDH3A1, AKR1C1, H19 and GPX2) are known to be clinically notable in lung cancer studies. Furthermore, statistical discriminate analysis showed that these genes could classify samples in smokers and non-smokers correctly with 100% accuracy. With the performed GSOM map, other nodes with high average discriminate scores included genes with alterations strongly related to the lung cancer such as AKR1C3, CYP1B1, UCHL1 and AKR1B10. Conclusions: This clustering by comparing expression of thousands of genes at the same time revealed alteration in normal smokers. Most of the identified genes were strongly relevant to lung cancer in the existing literature. The genes may be utilized to identify smokers with increased risk for lung cancer. A large sample study is now recommended to determine relations between the genes ABHD2 and ADH7 and smoking.

• 생명과학회지
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• 제22권5호
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• pp.657-664
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• 2012

본 연구의 목적은 인지기능을 가진 약효제를 발굴하는 것이다. 본 연구에서는 토끼의 간과 신경세포로부터 각각 유래한 angiotension converting enzyme과 acetylcholinesterase에 대한 강황 열수추출물(CLWE)의 억제효과 뿐만 아니라 항산화 효과가 조사되었다. 이리하여 먼저 산화적 스트레스와 연관이 있는 환원력과 DPPH radical, superoxide anion, hydroxyl radical, lipid peroxidation에 대한 CLEW의 소거능 및 DNA 산화에 대한 보호효과를 평가하였다. CLEW는 환원력 뿐만 아니라 본 연구에서 시험된 활성산소종 중에서 특히 superoxide anion의 소거능이 가장 우수한 것으로 나타났다. 더욱이 CLEW는 0.25% 이상의 농도에서 angiotensin converting enzyme 활성을 억제효과를 발휘하는 것으로 나타났다. 신경세포에서 CLEW는 또한 산화적 스트레스와 nitric oxide 유발을 억제하였다. 그러므로 이상의 결과는 CLEW의 항산화 효과와 신경세포 보호효과를 입증하여, 이것이 사람의 신경건강을 위한 천연생물소재로 잠재적인 가능성을 가지고 있을 것으로 시사한다.

• 대한한방내과학회지
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• 제25권4호
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• pp.324-336
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• 2004

Objectives : The purpose of this investigation is to evaluate the effects of Scutellaria baicalensis GEORGI on alteration in gene expression in a hypoxia model using cultured rat cortical cells. Methods : E18 rat cortical cells were grown in a Neurobasal medium containing B27 supplement. On 12 DIV, Scutellaria baicalensis GEORGI(20 ug/ml) was added to the culture media and left for 24 hrs. On 11 DIV, cells were given a hypoxic insult $(2%\;O_2/5%\;CO_2,\;37^{\circ}C,\;3\;hrs)$, returned to normoxia and cultured for another 24 hrs. Total RNA was prepared from Scutellaria baicalensis GEORGI-untreated (control) and -treated cultures and alteration in gene expression was analysed by microarray using rat 5K-TwinChips. Results : For most of the genes altered in expression, the Global M values were between -0.5 to +0.5. Among these, 1143 genes increased in their expression by more than Global M +0.1, while 1161 genes decreased by more than Global M -0.1. Effects on some of the genes whose functions are implicated in neural viability are as follows: 1) The expression of apoptosis-related genes such as Bad (Global M = 0.39), programmed cell death-2(Pdcd2) (Global M = 0.20) increased, while Purinergic receptor P2X(P2rxl) Global M = -0.22), Bc12-like1(Bc1211)(Global M = -0.19) decreased. 2) The expression of 'response to stress-related genes such as antioxidation-related AMP-activated protein kinase subunit gamma 1 gene (Prkag1) (Global M = 0.14), catalase gene (Global M = 0.14) and Heme Oxygenase(Hmoxl) increased. 3) The expression of Fos like antigen 2 (Fos12) expressed in neurons that survive ischemic insult increased (Global M = 0.97). Conclusions : these data suggest that Scutellaria baicalensis GEORGI increases the expression of antiapoptosis- and antioxidation- related genes in a way that can not yet be explained.

• 한국동물학회지
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• 제32권1호
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• pp.55-73
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• 1989

Tryptophan 또는 serotonin을 계란에 투여하고 배양하였을 때의 초기 계배의 뇌형성에 미치는 영향을 관찰한 결과, 뇌의 신경세포는 핵막의 불규칙하고 핵응축현상이 심하며 염색질이 핵막에 응집되고 인도 분해되었으며 핵막이 팽출되어 생긴 수포가 형성되었다. 그리고 조면소포체와 골지체는 심하게 확장되어 있었고, 미토콘드리아는 팽윤화된 것이 많았으며 신경세관의 발달이 매우 미비하였다. 즉 이와 같은 현상은 특히 초기 1-2일간 배양 계배에서 극심하였다. Tryptophan 또는 serotonin을 투여한 후 18시간 배양한 배반엽의 간충 세포는 대조군에 비하여 세포질이 미숙하였고, 세포내 소기관이 크게 손상되어 있었으며 난황과립의 분해가 대조군에 비하여 지연되고 있음을 알 수 있었으며, 24-72시간 배양한 배반엽의 암대의 미세융모는 대조군에 비하여 현저하게 길이가 짧고 발달이 미비하였다. 또한 Tryptophan 또는 serotonin을 투여한 계배의 경우 배반엽의 크기, 투명대 및 배의 크기가 대조군에 비하여 작았으며, serotonin 처리군의 경우가 더욱 작았다. 또한 단백질 및 핵산 함량이 대조군에 비하여 훨씬 낮았고 tubulin 합성량도 크게 저하되었음이 확인되었다. 위와 같은 실험결과는 과량의 tryptophan 또는 serotonin이 난황과립 분해를 지연시켜 결과적으로 단백질 합성을 억제함으로서 tubulin합성이 저하되고, 이로 인하여 미세소관의 형성과 미세융모의 발달과 기능이 부진하여 형태형성에 이상을 초래하는 것으로 사료된다.

• Journal of Gastric Cancer
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• 제7권3호
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• pp.160-166
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• 2007

목적: 진행성위암의 경우 근치적 수술 후 보조항암요법에도 불구하고 5년 생존율이 그리 높지 않은 것으로 보고되고 있다. 이에 항암제 감수성 검사를 기초로 한 항암요법은 최소한 환자들에게 효과가 없는 약제 투여를 막을 수 있는 기회를 제공할 수 있다는 측면에서는 고무적이라 할 수 있다. 본 연구에서는 보조항암요법의 효과를 높이기 위한 유효약제 선정을 위하여 항암제 감수성검사를 실시하였으며 그 결과를 분석하여 항암제 선택에 이용하고자 임상병리학적 요인에 따른 항암제 감수성을 비교하였다. 대상 및 방법: 2005년 8월부터 2006년 8월까지 영남대학교 병원 외과에서 위절제술을 받은 위암환자 81명의 위암절제조직을 이용하여 항암제 감수성 검사를 실시하였다. 검사방법은 ATP (Adenosine Triphosphate) based chemotherapy response assay였다. 항암제 감수성과 임상병리학적 요인과의 상관관계를 보기 위하여 성별, 연령, 종양표지자(CEA 치, CA19-9 치), 암의 위치, 진행암 형태, 조직학적 형태, 분화 유무, 침윤도, Lauren 분류, Ming 분류, 림프관 침윤 유무, 맥관 침윤 유무, 신경 침윤 유무, 림프절 전이 유무, 병리학적 병기를 선정 비교하였다. 결과: 위암 환자를 대상으로 한 항암제 감수성 순위를 보면 5-FU, Epirubicin, Irinotecan, Oxaliplatin 순이었으며 통계학적으로 유의했다(P=0.000). 성별, 연령, 종양표지자(CEA 치, CA19-9치), 암의 위치, 진행암 형태, 조직학적 형태, 분화 유무, 침윤도, Lauren 분류, Ming 분류, 림프관 침윤 유무, 맥관 침윤 유무, 신경 침윤 유무, 림프절 전이 유무, 병리학적 병기 모두에서 유의하게 감수성의 차이를 보였다. 결론: 위암절제조직에서 시행한 항암제 감수성 순위는 5-FU, Epirubicin, Irinotecan, Oxaliplatin의 순이었으며 위절제술을 받은 위암환자의 절제조직을 이용 항암제 감수성검사를 시행한 결과 약제별 임상병리학적 인자에 따라 감수성의 차이가 있으므로 획일적인 항암화학요법을 실시하는 것보다 항암제 감수성 검사를 통하여 감수성 높은 약제들을 조합하여 사용하는 것이 바람직할 것으로 보인다.

• Applied Microscopy
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• 제29권1호
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• pp.11-23
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• 1999

머리 부분에 많은 양의 방사선을 조사 받은 흰쥐 뇌실막세포의 미세구조에 대하여 연구하였다. 체중 $200\sim250g$의 흰쥐를 실험동물로 사용하였고, 방사선 발생장치로는 Mitsubishi linear accelerator (ML-4MV)를 이용하였다. 실험군의 흰쥐는 sodium thiopental로 마취시킨 후 머리부분이 조사구역 $(30cm\times30cm)$ 안에 들도록 눕힌 후, 조사거리 80cm, 조사 깊이 1.2 cm의 조건에서 200 rad/min의 속도로 연속 조사하였다. 실험군에 따라 3,000 rad 또는 6,000 rad를 조사시킨 후 각각 6시간, 2일, 6일 후에 동물들을 희생시켰다. 희생시에는 마취된 흰쥐의 가슴을 열고 심장을 통한 관류고정을 시행하였고, 관류고정액은 1% glutaraldehyde-1% paraformaldehyde액을 사용했다. 고정된 뇌에서 가쪽뇌실벽 일부를 메어 관류고정액과 같은 고정액에 다시 고정한 후, 2% osmium tetroxide 액으로 이차고정 하였고, 이후 통상적인 방법으로 전자현미경 절편제작 및 염색과정을 거친 후 전자현미경으로 관찰한 결과 다음과 같은 결론을 얻었다. 1. 방사선조사후 6시간군부터 뇌실막세포는 종창현상을 보였고 섬모의 배열이 흐트러졌으며 부분적으로 세포질이 뇌실공간으로 돌출하였다. 2. 방사선조사후 2일군부터는 뇌실막세포의 종창현상이 심하며 뇌실막밑조직의 부종이 심했다. 3. 뇌실막세포의 돌출부분 세포질에는 섬모바닥체, 사립체, 세포질세망들이 들어 있었다. 4. 방사선조사군에서는 확장된 뇌실막세포사이공간을 통하여 뇌실막밑층의 축삭성분 등이 뇌실속 까지도 돌출하였다. 이와 같은 결과로 보아 방사선조사에 의해 뇌실막세포에는 심각한 형태학적 변화가 초래되며, 이로써 뇌실질과 뇌척수액사이의 대사관문이 교란될 것으로 생각된다.

• Applied Microscopy
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• 제28권4호
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• pp.425-434
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• 1998

This study was designed to investigate the microglial reactions to the neurodegenerative changes in the cat retina. All experiments were performed using adult cats of both sex, weighing $2,500g\sim3,500g$. 5,7-DHT $(100{\mu}g)$ dissolved in 0.1% ascorbic acid was injected into the vitreous body. All injections were performed in one-side eye; the other side served as the control, which was injected only with 0.1% ascorbic acid. Cats were sacrificed at 1, 3, 7, 14 and 21 days after intravitreal injection of 5,7-DHT For light microscopy, retinae were fixed with 4% paraformaldehyde and processed using NDPase histochemistry. Same retinae were fixed with 1% para(formaldehyde-2.5% glutaraldehyde and processed for electron microscopy. NDPase-positive microglial cells were mainly distributed in the inner plexiform layer of the retina, and characterized by a small somata with a few slender processes, which were also extended in the ganglion cell layer (GCL) and inner nuclear layer (INL). The intensity of the microglia stained for NDPase was abruptly increased at 7 day as compared with that of the control, and thereafter continuously sustained until 21 day, the last experimental group in this study. Under the electron microscopical observation, microglial cells in the control group exhibited elongate nucleus with perinuclear chromatin condensation, and the perikaryon was scanty. However, a few hypertrophic glial cells were frequently found at 3 days after the drug injection. By 7 day, most microglial cells directed toward the degenerated neurons in the GCL, and the number of microglial cells was slightly increased as compared with the former group. At the 14 day, most microglial cells wrapped the degenerated cells in the GCL, and a few cells showed phagocytotic features. By 21 day, most microglial cells were engaged in phagocytotic activity, and their cytoplasm was filled with the phagorytosed material. Based on the results, 5,7-DHT may act as a specific neurotoxin to the cat retina, and microglial reactions to the neuronal death are already induced in early experimental stage. These results indicate that the microglial cells in the cat retina show characteristic features as a protective effect of neural tissue.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.44-45
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• 2010

We are currently conducting studies on culturing and biocompatibility assessment of various cells such as neural stem cells and induced pluripotent stem cells(IPS cells) on carbon nanotube (CNT), on nerve regeneration electrodes, and on silicon wafers with a focus on developing nerve integrated CNT based bio devices for interfacing with living organisms, in order to develop brain-machine interfaces (BMI). In addition, we are carried out the chemical modification of carbon nanotube (mainly SWCNTs)-based bio-nanosensors by the plasma ion irradiation (plasma activation) method, and provide a characteristic evaluation of a bio-nanosensor using bovine serum albumin (BSA)/anti-BSA binding and oligonucleotide hybridization. On the other hand, the researches in the case of "novel plasma" have been widely conducted in the fields of chemistry, solid physics, and nanomaterial science. From the above-mentioned background, we are conducting basic experiments on direct irradiation of body tissues and cells using a micro-spot atmospheric pressure plasma source. The device is a coaxial structure having a tungsten wire installed inside a glass capillary, and a grounded ring electrode wrapped on the outside. The conditions of plasma generation are as follows: applied voltage: 5-9 kV, frequency: 1-3 kHz, helium (He) gas flow: 1-1.5 L/min, and plasma irradiation time: 1-300 sec. The experiment was conducted by preparing a culture medium containing mouse fibroblasts (NIH3T3) on a culture dish. A culture dish irradiated with plasma was introduced into a $CO_2$-incubator. The small animals used in the experiment involving plasma irradiation into living tissue were rat, rabbit, and pick and are deeply anesthetized with the gas anesthesia. According to the dependency of cell numbers against the plasma irradiation time, when only He gas was flowed, the growth of cells was inhibited as the floatation of cells caused by gas agitation inside the culture was promoted. On the other hand, there was no floatation of cells and healthy growth was observed when plasma was irradiated. Furthermore, in an experiment testing the effects of plasma irradiation on rats that were artificially given burn wounds, no evidence of electric shock injuries was found in the irradiated areas. In fact, the observed evidence of healing and improvements of the burn wounds suggested the presence of healing effects due to the growth factors in the tissues. Therefore, it appears that the interaction due to ion/radicalcollisions causes a substantial effect on the proliferation of growth factors such as epidermal growth factor (EGF), nerve growth factor (NGF), and transforming growth factor (TGF) that are present in the cells.