한국인 남녀 알코올 의존 환자에서의 알코올 대사 효소 유전자 다형성에 관한 연구

강철중(Cheol-Joong Kang),김성곤(Sung-Gon Kim),김현경(Hyeun-Kyeung Kim),황인복(In-Bok Hwang),변원탄(Won-Tan Byun) 대한생물치료정신의학회 2006 생물치료정신의학 Vol.12 No.1

Objective : Alcohol is metabolized in hepatocyte through alcohol dehydrogenase(ADH), microsomal ethanol oxidizing system (MEOS) and catalase. In cases of alcohol dependence, the activity level of the MEOS increases, especially Cytochrome P₄?? 2E1 (CYP2E1). The goal of this study was to investigate whether the CYP2E1 polymorphism is associated with alcohol dependence, and to investigate gender differences in the frequencies of CYP2E1 genotypes and allels. Method : The subjects were Korean male(n=104) and female(n=40) alcohol dependent patients diagnosed with Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition(DSM-Ⅳ). Control groups were healthy Korean male(n=79) and female(n=59) subjects who do not drink over five standard drinks per month. Subjects' CYP2E1 polymorphisms(RsaⅠ+PstⅠ, OraⅠ and TaqⅠ) were determined by a polymerase chain reaction(PCR) and restriction fragment length polymorphism (RFLP). Results : 1) In male subjects, there was no association between alcoholics and control groups in the genotype frequency and the allele frequency of the three polymorphisms of CYP2E1. 2) In female alcoholics, the frequency of the A1A1 and A1A2 genotypes of the Taql polymorphism was significantly higher than in the female control groups(df=2, χ²=6.42, p=0.04), while other frequency levels of genotypes and alleles were not significant. Conclusion : These findings suggest genetic associations between CYP2E1 polymorphism and female alcohol dependence but not male. 목적 : 알코올 의존의 발생에서 유전적 원인이 남녀간에 다를수 있음을 보여주는 선행 연구 결과들이 있다. 따라서 알코올 대사 효소 유전자들의 유전적 중요성이 남녀간 차이가 있을 것이라는 가설 하에 한국인 알코올 의존 환자와 정상인을 대상으로 cytochrom P4502El(CYP2E1) 유전자의 5’ -flank 부위(제한효소 Rsa Ⅰ과 Pst Ⅰ), intron 6 부위 (제한효소 DraⅠ) 및 intron 7 부위 (제한효소 Taq Ⅰ)의 유전자형의 빈도를 조사하고 남녀 각각 차이가 있는지를 비교 분석하였다. 방법 : 알코올 의존 환자 144명 (남자 104명, 여자 40명)과 정상인 138영(남자 79명, 역자 59명)을 대상으로 CYP2E1유전자의 5’ -flank 부위(제한효소 Rsa Ⅰ과 Pst Ⅰ) 의 c1c1과 c1c2 및+c2c2(이하 c2+) 유전자형, intron 6 부위(제한효소 Dra Ⅰ) 의 DD와 DC+CC(이하 C+) 유전자형 및 intron 7 부위(제한효소 Taq Ⅰ) 의 A2A2와 A2A1+A1A1(이하 A1+) 유전자형에 빈도를 남녀 각각 비교하였다. 유전자형의 분석은 말초혈액 백혈구에서 DNA를 분리한 후 PCR-RFLP 방법을 이용하여 실시하였다. 결과 : CYP2E1 유전자의 5’ -flank 부위의 유전자형의 빈도와 intron 6 부위 유전자형의 빈도에서는 남자 혹은 여자 알코올 의존환자 모두 남자 혹은 여자 정상대조군과 유의한 차이가 없었다. 한편, intron 7 부위 유전자형의 빈도에 있어서는 여자 알코올 환자가 여자 정상대조군에 비하여 A1A1, A1A2의 빈도가 유의하게 높게 나타났으나, 남자는 유의한 차이가 없었다. 결론 : 이러한 결과는 여성에서의 알코올 의존 발생에 CYP2E1 유전자의 intron 7 부위(제한효소 Taq Ⅰ) 유전적 다형성이 중요하다는 것을 제시하고 있다.

한국민담 "바늘 상자 속에 넣어 둔 눈알"에 대한 분석심리학적 해석

강철중 ( Cheol Joong Kang ) 한국분석심리학회 2008 心性硏究 Vol.23 No.1

The Korean fairytale `Eyes in the Sewing Box` is a story about a boy who was abandoned by his mother and searches to find own father. The father was exiled to a distant place and the boy lived with his stepmother. One day, his stepmother told him that his father got a serious disease and he needed fresh human eyes for a cure. The boy took out his eyes and gave them to his mother. But the story was a lie and it was her plan to abandon her son. She put her son`s eyes into her silk pouch and kept them in her sewing box. The boy`s stepmother abandoned the boy and brought him to a riverside very far from their home. Because of his blindness, he could not find where to go. He was completely lost and finally he fell into a river. But fortunately he landed on an island. He found a bamboo grove and heard some beautiful sounds which came from the bamboo. He wanted to find where the sound came from. He grabbed the bamboo one by one, finally he found it. Then he cut the bamboo and made a flute. He sat there and played the bamboo flute every day, all day long. The sound was extremely beautiful and emotional. Everybody who heard the sound was touched by it. One day, a local judge heard the sound and ordered his servant to find the person who played the flute. The servant brought the boy in front of the judge. The judge asked him about his story, how he became blind, and why he played the bamboo flute. The boy told him his entire story. Just then, his father heard the story of the boy in the crowd. Finally the boy and his father met again. They went back to their home and found his eyes. The boy`s vision was restored and he forgave his mother. They lived together happily ever after. This story is about a boy who loses his father and who is reunited with his father again. Immature consciousness cannot stand individually, so it is helpless under the influence of negative mother archetype. Additionally, it takes out the vision of consciousness. The consciousness isolated in the lonely island, and surrounded by unconsciousness. But the island is individual space, though it is very small and lonely. From there, the sound is produced spontaneously. That is the sound of the Self. The consciousness does not ignore the sound from the Self, finally it gets back its` paternity and achieves higher consciousness.

땅에 투사된 자기의 상징 -명당의 분석심리학적 측면-

강철중 ( Cheol Joong Kang ) 한국분석심리학회 2011 心性硏究 Vol.26 No.1

풍수는 음양오행설에 기초를 둔 주거지와 묏자리의 환경에 대한 체계이다. 풍수에서는 땅 속에 존재하는 생기의 흐름이 있다는 믿음을 전제로, 그 흐름을 중요시 하여 가능하면 그 생기를 잘 받을 수 있는 땅에 집터나 묘지를 만들고자 한다. 산 사람은 땅 위에 얹혀 살며 그 기운(생기)을 얻는 반면, 죽은 자는 땅 속에서 그 기운을 직접 받아들이기 때문에 산 사람 보다는 죽은 사람이 얻는 생기가 더 크고 확실하다고 믿는다. 이렇게 죽은 사람이 얻는 생기는 후손에게 그대로 이어진다고 여겼는데 이를 동기감응, 혹은 친자감응이라고 한다. 땅속의 기운이 좋은 곳을 찾아 살거나 혹은 그러한 곳에 조상의 뼈를 묻음으로써 후손들이 그 기운을 이어받아 후손들의 번영을 기원하는 것이다. 풍수에서 땅속의 생기를 잘 받을 수 있는 위치의 땅을 명당이라고 한다. 명당을 선정하는 방법에 대해 과거로부터 많은 경험들을 체계적으로 정리한 것이 풍수의 이론이다. 최고의 자리라고 알려진 명당의 형국을 상징적으로 살펴보면, 사위와 원 등으로 표현되는, 조화와 균형이라는 측면에서 전체성의 상징인 자기(Self)의 상징을 발견할 수 있다. 명당을 찾고자 하는 노력은 서양의 연금술사들이 최고의 물질인 금을 얻기 위해 행해온 것과 유사하다고 볼 수 있다. 그러므로 명당은 우리 마음속의 최고의 가치인 조화와 균형, 완전성 그리고 전일성인 자기의 상이 땅에 투사된 것이다. 우리는 그것을 찾는 과정에서 우리 정신의 전체성을 추구하는 과정과 유사한 모습을 엿볼 수 있다. Pungsu is an ancient logic that systemizes geography based on the Yin-Yang and The Five Elements Principle. It is defined as the unique and highly systemized ancient Eastern art of selecting auspicious sites and arranging harmonious structures such as graves, houses, and cities on them by evaluating the surrounding landscape and cosmological directions. Pungsu helps allegedly one improve life by receiving vital energy(Shengqi, 生氣)-energy flow that flows under the ground. It is traditional belief that the living lead their lives on the ground, indirectly receiving the energy coming out of the ground, whereas the dead are buried under the ground, allowing them to directly absorb energy from the ground, which makes Shengqi the dead receive bigger and more obvious than that the living receive. This energy absorbed by the dead from the ground was believed to be passed on to their descendants. This phenomenon is called “Induction of vital energy between Ancestors and Descendants”. People searched for the sites which were believed to contain rich and positive vital energy flow. They also tried to bury their ancestors under such sites hoping to receive the Shengqi coming from underground which they believed would help them thrive and prosper. The efforts to locate the sites which have the most vital energy, auspicious sites or “Bright Yard(明堂)”, are easily observed in Asia including China and Korea. The ultimate goal of searching for auspicious sites lies in human(whether alive or dead) receiving vital energy from the nature to enjoy happy lives. In choosing a place to live or to bury their dead ancestors, people tried to understand the energy flow of the site considering the factors related with mountain, water, and direction. If we take a closer look into the methods of finding auspicious sites, we can see that people have tried to see the outer conditions of lands, mountains and waters within the perfect harmony if possible. Auspicious site or Bright Yard is the site with those elements in perfect order and harmony, that is, it is the place which derives the most vital energy from the best order and harmony of nature. As this shows, an auspicious site symbolizes totality-the Self, and it seems to be projected to the land. It is believed to be an attempt that the reason why we try to find auspicious sites to internalize the totality that we projected to the outer world. Therefore, this auspicious site is what our foremost values, symbol of the Self, such as harmony, equilibrium, perfection, and uniqueness are reflected to the land. Through the process of finding such a site, we try to gain totality of psyche.

남성의 모성 콤플렉스

강철중 ( Cheol Joong Kang ) 한국분석심리학회 2007 心性硏究 Vol.22 No.2

정신분열병환자에서 Taq I A 도파민 $D_2$ 수용체 다형성과 항정신병약물의 치료반응과의 연관

강철중,Kang, Cheol Joong 대한생물정신의학회 2005 생물정신의학 Vol.12 No.2

Purpose:In an attempt to predict the interpersonal differences of therapeutic response to antipsychotic drugs on pharmaco-genetic bases, this study was designed to investigate the relationship between the therapeutic response to antipsychotic drugs and Taq I A dopamine $D_2$ receptor polymorphism in schizophrenic patients. Methods:The subjects were 158 patients diagnosed with schizophrenia(DSM-IV). The therapeutic response to antipsychotic drugs was evaluated using the Treatment Response Scale(TRS) retrospectively. Patients were divided into two groups, dopamine receptor antagonist responders, and serotonin-dopamine antagonist responders. The patients' Taq I A dopamine $D_2$ receptor polymorphism was determined by polymerase chain reaction(PCR) and restriction fragment length polymorphism(RFLP). Results:The dopamine receptor antagonist responders had the A1 allele in significantly higher incidences (${\chi}^2$(1)=4.875, p=0.027, two-tailed). No significant difference was found among the serotonin-dopamine antagonist responders between those with or without the A1 allele. Conclusions:The patients with the A1 allele responded better to dopamine receptor antagonists than those with no A1 allele. Based on these results, it is suggested that the pharmacological effect of dopamine receptor antagonists can be predicted depending on the presence of the A1 allele in schizophrenic patients.

한국어판 Eating Disorder Inventory의 요인구조

김철민 ( Cheol Min Kim ),박제민 ( Je Min Park ),김성곤 ( Sung Gon Kim ),김명정 ( Myung Jung Kim ),강철중 ( Cheol Joong Kang ),김지훈 ( Ji Hoon Kim ) 한국정신병리진단분류학회 2005 精神病理學 Vol.14 No.1

Objective: As a pilot study to develop a screening tool for eating disorders(EDs), the authors delineated factor structure and discriminant validity of the 64-item Korean version of Eating disorder inventory(EDI). Method: The EDI was administered to 1,217 Korean girls` high school students. Principal component analysis, one-way ANOVA and Receiver operating characteristic(ROC) curve analysis on EDI total and subscale scores were done. Diagnosis of EDs was based on a self report questionnaire derived from the Structured interview for DSM-IV. Result: Thirteen factors were extracted, explaining 58% of total variance but could be restructured into nine. Item construction was comparable with the Garner et al`s report except Interoceptive awareness subscale. Significant differences were noticed among diagnostic groups in the EDI total scores and subscale scores of drive for thinness, body dissatisfaction, bulimia/overeating and emotional/interpersonal problem. Other subscales such as interoceptive awareness, perfectionism, fear of maturity, interpersonal distrust and personal ineffectiveness failed to differentiated diagnostic groups. ROC curve analysis revealed dissatisfactory sensitivity and specificity of EDI as a screening tool. Moreover, EDI failed to detect AN type of EDs, showing greater usefulness for BN type. Conclusion: These data suggest that a new screening tool comprising ED- specific subscales would prove enhanced sensitivity and specificity for detecting different diagnostic groups of EDs for non-clinical population.

남성화된 암컷 생쥐에서 Testosterone이 통각예민도에 미치는 영향

전명호,김명정,박제민,양구범,이국희,장세헌,강철중,Chon, Myong-Ho,Kim, Myung-Jung,Park, Je-Min,Yang, Gu-Beum,Lee, Kook-Hee,Jang, Sae-Heon,Kang, Cheol-Joong 한국정신신체의학회 2000 정신신체의학 Vol.8 No.1

연구목적 : 본 연구는 암컷 생쥐에서 출생직후 testosteorne에 노출시키면 testosterone과 연관된 통각억제계의 발달이 영향을 받으며 성인기의 testosterone 투여는 통각예민도를 감소시킨다는 가설을 검증하기 위하여 시행되었다. 방법 : 출생직후 testosterone에 노출시켜 남성화된 Institute for Cancer Research계 암컷생쥐 30마리와, 남성화 시키지 않은 정상 암컷생쥐 25 마리를 84일간 성장 시킨후 testosterone 1mg/kg를 1일 1회 3일간 투여하였다. testosterone 투여전후 통각 예민도를 tail flick latency로 실험 84일과 86일에 측정하였다. 1) 실험 84일째 기저통각 예민도는 남성화군이 $2.7{\pm}0.4$초로서 대조군의 $3.3{\pm}1.1$초에 비하여 유의하게 예민하였다. 2) 실험 84일째 testosterone 주사 후의 유해 감각 예민도는 남성화군이 $5.2{\pm}0.9$초로서 대조군의 $4.6{\pm}1.8$초에 비하여 유의하게 둔감하였고 두 군 모두에서 기저 통각 예민도에 비하여 유의하게 둔하여졌으나 남성화군에서 둔화의 정도가 유의하게 컸다. 3) 실험 86일째 testosterone 주사 전 통각 예민도는 남성화군이 $4.8{\pm}1.9$초로서 대조군의 $3.9{\pm}1.2$초에 비하여 유의하게 둔감하였다. 4) 실험 86일째 testosterone 주사 후 통각 예민도는 남성화군이 $5.9{\pm}0.9$초로서 대조군의 $4.9{\pm}1.5$초에 비하여 유의하게 둔감하였고 두군 모두에서 주사전에 비하여 유의하게 둔하여 졌으나 둔화의 정도에는 차이가 없었다. 5) 실험 84일과 비교하여 실험 86일째 주사전 통각 예민도의 변화는 남성화군이 $2.1{\pm}1.0$초로서 대조군의 $0.5{\pm}1.3$초에 비하여 유의하게 둔하여 졌으나 주사후 통각예민도의 변화는 유의하지 않았다. 결론 : 이상의 결과에서 저자는 testosterone 연관 통각억제계가 존재할 것이고 이 통각억제계의 발달은 신생아기에 testosterone 투여로 강화되며 성장후 이 통각억제계의 활성은 testosterone이 매개할 가능성을 제시한다. Objects : Aimed to test the hypothesis that neonatal testosterone exposure in female mice influences the development of testosterone-related pain inhibitory system and that testosterone administered in adulthood decreases the pain sensitivity. Methods : Thirty androgenized(testosterone propionate $100{\mu}g$ ip within 24 hrs after birth) adult female and twenty five control(normal saline $100{\mu}g$ ip within 24 hrs after birth) adult female mice were injected with testosterone propionate 1mg/kg/day for 3 consecutive days from 84th experimental days. Nociceptive sensitivity was measured before and after treatment of testosterone by tail flick latency on 84th and 86th experimental days. Results : 1) On the 84th experimental day, basal nociceptive sensitivity was significantly higher in the androgenized group($2.7{\pm}0.4$ sec) as compared to the control group($3.3{\pm}1.1$ sec). 2) Testosterone treatment on the 84th experimental day significantly lowered nociceptive sensitivity in both androgenized($5.2{\pm}0.9$ sec) and control groups($4.6{\pm}1.8$ sec). However the effect was significantly greater in the androgenized group. 3) Nociceptive sensitivity on 86th experimental day before administration of testosterone was significantly lower in the androgenized group($4.8{\pm}1.9$ sec) as compared to the control group($3.9{\pm}1.2$ sec). 4) Testosterone treatment on the 86th experimental day significantly lowered the nociceptive sensitivity in both groups, but the androgenized group($5.9{\pm}0.9$ sec) showed significantly lower post-treatment nociceptive sensitivity as compared to the control group($4.9{\pm}1.5$ sec). 5) Nociceptive sensitivity was decreased significantly after injection of testosterone once a day for two consecutive days in the androgenized group(${\Delta}2.1{\pm}1.0$ sec), but not in the control group(${\Delta}0.5{\pm}1.3$ sec). Conclusions : There may be a testosterone-related pain inhibitory system, the development of which is enhanced by exposure to testosterone in the neonatal period, and the activity of which is also mediated by testosterone in the later life.

알코올 의존 환자에서 한국어판 알코올 충동 척도(Korean Alcohol Urge Questionnaire, AUQ-K)의 신뢰도와 타당도 연구

김철민,김성곤,김민정,김호찬,오광욱,김효정,김세훈,이덕기,변원탄,강철중,Kim, Cheol Min,Kim, Sung Gon,Kim, Min Jeong,Kim, Ho Chan,Oh, Kwang-Ook,Kim, Hyo Jeong,Kim, Se Hoon,Lee, Duk Ki,Byun, Won Tan,Kang, Cheol Joong 대한생물정신의학회 2008 생물정신의학 Vol.15 No.3

Objectives : The Alcohol Urge Questionnaire(AUQ) has been used in alcohol dependence treatment and research. The goal of this study is to develop of the Korean Alcohol Urge Questionnaire(AUQ-K). Methods : To examine the AUQ-K's psychometric properties, responses from 104 patients admitted in alcohol dependence treatment facility were investigated. Results : The internal consistency of the 8-item AUQ-K, measured by coefficient ${\alpha}$, was high(Cronbach's ${\alpha}$=0.78). AUQ-K scores showed significant correlation when the retest interval was 1 day(p<0.01). The AUQ-K's validity was investigated using correlational analyses with two other craving scales[the Obsessive Compulsive Drinking Scale(OCDS) and the Visual Analogue Scale(VAS)]. The high correlations were obtained between total AUQ-K scores and total OCDS scores, and between total AUQ-K scores and the VAS scores(p<0.01, respectively). Conclusion : The AUQ-K is a reliable and valid short scale for measurement of self-reported alcohol craving. This scale may offer significant advantages over existing single-item measures of alcohol craving in the fields of alcohol dependence treatment and research.

Naltrexone과 ondansetron의 병합투여가 C57BL/6형 생쥐의 알코올 섭취량에 미치는 영향

김현경(Hyeun Kyeung Kim),김성곤(Sung Gon Kim),강철중(Cheol Joong Kang),박상익(Sang Ick Park),김원호(Won Ho Kim) 한국생명과학회 2007 생명과학회지 Vol.17 No.11

알코올 의존의 음주 행동에 VTA에서 NA로 뻗어 있는 도파민 대뇌 보상 경로가 중요하다. 이러한 경로의 도파민 활성도가 5-HT₃계 신경에 의하여 조정되고 있으며, 5-HT3 수용체 길항제인 ondansetron (OND)이 알코올리즘 환자에서 음주량을 감소시키고 금주률을 높인다는 보고가 있다. 이에 생쥐의 섭취량에 대하여 5-HT₃수용체 길항제인 ondansetron의 투여 효과와, 이러한 ondansetron 및 비 특이적 아편계 수용체 길항제인 naltrexone (NTX)과의 병합 투여 효과를 검증하는데 목적이 있다. 알코올 의존화된 C57BL/6형 수컷 생쥐를 4군으로 나눈 뒤, 10일간 각 군에 vehicle, OND 0.01 ㎎/㎏ 단독, NTX 1.0 ㎎/㎏ 단독, 및 OND 0.01 ㎎/㎏과 NTX 1 ㎎/㎏ 병합 투여하면서 2시간 알코올의 섭취량, 22시간 물 섭취량, 24시간 사료 섭취량 및 체중을 조사하였다. 본 연구의 결과로 2시간 알코올 섭취량의 10일간 변화에 대해 vehicle 투여 군과 나머지 3군의 약물 투여군과 repeated measure ANOVA를 이용하여 각각 비교하였을 때, vehicle 투여군과 NTX 단독 투여군간에 유의한 교차가 관찰되었으나 (p=0.042), OND 단독 투여군과 NTX과 OND 병합 투여군은 vehicle 투여군과 유의한 차이가 없었다. 일별 2시간 알코올 섭취량에 대하여 NTX 투여군과 vehicle 투여군의 군간 비교시 vehicle 투여군에 비하여 NTX 투여군에서 약물투여 4일부터 10일까지 유의하게 감소하였다(4일 p=0.010; 6일 p=0.050; 8일 p=0.017; 10일 p=0.005). 그리고 NTX과 OND 병합 투여군과 vehicle 투여군의 양군을 비교하였을 때에는 2시간 알코올 섭취량이 4일과 10일에만 유의하게 감소하였다(4일 p=0.049; 10일 p=0.022). 그러나 22시간 물 섭취량, 24시간 사료 섭취량 및 체중의 10일간 변화에 대해 vehicle 투여군과 나머지 3 군의 약물 투여군과의 repeated measure ANOVA를 이용하여 각각 비교하였을 때, 모두 유의한 교차효과가 없었다. 이상의 결과는 생쥐의 섭취량에 대하여 OND의 투여 효과는 없었으며, OND과 NTX의 병합 투여시에는 NTX의 알코올의 섭취량 억제 효과가 감소되었다. 따라서 앞으로 5-HT3 신경계와 도파민 및 아편 신경계와의 상관관계에 대한 연구가 필요할 것으로 생각된다. Dopamine reward pathway projecting from ventral tegmental area to nucleus accumbens is well known as playing an important role in alcohol dependence. It is supposed that this dopamine pathway is modulated by 5-HT₃ nervous system, and it was reported that ondansetron (OND), 5-HT₃ receptor antagonist, reduced drinking amount and increased abstinence rate in alcohol-dependent patients. The purpose of this study is to investigate the effect of combination of OND and naltrexone (NTX), non-specific opioid receptor antagonist, on alcohol intake in C57BL/6 mice. In 40 C57BL/6 mice in the state of alcohol dependence, vehicle, while OND 0.01 ㎎/㎏, or NTX 1.0 ㎎/㎏ administrated respectively, or OND 0.01 ㎎/㎏ and NTX 1.0 ㎎/㎏ administrated simultaneously for ten days, medication effects on 2-hr alcohol, 22-hr water, 24-hr food intake and body weight were studied. When vehicle group was compared with 3 medication groups respectively, using a repeated measure ANOVA, NTX alone and vehicle groups showed a significant medication by time interaction (p=0.042) in 2-hr alcohol intake, but in the other 2 groups, OND and NTX combination group and OND alone group, there was no significant interaction with vehicle group in 2-hr alcohol intake. From these results, it is suggested that there is no effect on alcohol intake in mice treating with OND, and naltrexone's suppression effect on alcohol intake in mice is attenuated when treating with OND and NTX simultaneously. It is supposed that a further study looking at the interactions of serotonin, dopamine and opioid nerves systems will be needed.

흰쥐의 중추성 Serotonin 고갈이 강제수영 중 부동자세 시간, 불안 및 수동적 회피 학습에 미치는 효과

박제민,김종백,강철중 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.3

흰쥐에서 p-chlorphenylalanine(PCPA)로 인한 강제수영 중 부동자세 시간의 단축이 불안이나 수동적 회피 학습 능력의 변화와 관련된 것인가를 검증하고자 하였다. 흰쥐에게 PCPA 300mg/kg 혹은 생리식염수를 하루 한 번 연속 3회 복강내 주사하였다. 마지막 주사 24시간 후에 공간에서의 활동성(ACT0), 높은 십자 통로 실험에서 개방 통로에 머무는 시간(ANX0), 왕복 회피상자에서 통과 지연 시간(STL0) 등을 측정하고 0.5mA 전기자극을 3초간 주어 회피 반응을 학습시켰다. 그리고 15분간 강제수영시켰다. 다음 날 같은 방법으로 활동성(ACT1), 불안(ANX1), 수동적 회피 반응 학습 정도(STL1), 5분간의 강제수영 중 총 부동 자세 시간 등을 측정하였다. 마지막 약물 혹은 대조액 투여 7일 후 수동적 회피 학습 유지 정도(STL7)를 다시 측정하였다. 결과는 아래와 같다. 1) 전체 대상군에서 ACT1은 ACT0보다 감소하였다. PCPA는 개방공간에서의 활동성에 영향을 주지 않았다. 2) PCPA 군은 높은 십자 통로 실험에서 ANX0와 ANX1 둘 다 대조군 보다 유의하게 길었다. 3) STL1은 PCPA군과 대조군 모두 STL0 보다 유의하게 지연되었다. PCPA는 STL0 이나 STL1에 영향을 주지 않았다. 그러나 대조군은 수동적 회피 학습 7일 후에도 통과 지연 시간이 유의하게 연장되어 있는데 반하여 PCPA군은 STL7이 STL0과 유의한 차이가 없었다. 4) 강제수영 중 부동자세 시간은 PCPA군이 대조군보다 유의하게 짧았다. 이상의 결과에서 PCPA 투여로 인한 강제수영 중 부동자세 시간의 단축은 PCPA가 비특이적 신체 활동을 증가시키거나 수동적 회피 반응 습득을 방해함으로써 일어나는 현상이 아니며, 진정 작용없이 탐색 행동을 증가시키거나, 스트레스 하에서의 행동 억제 현상을 차단함으로써 강제수영 중 부동자세 시간을 단축시킨다고 추론한다. 아울러 PCPA가 기억 고정 과정을 방해할 가능성이 있음을 제안한다. Purpose : The test if p-chlorophenylalanine(PCPA) induced decrease of immobility time during forced swimming test in rats is an epiphenomenon related with PCPA-induced changes in anxiety level or learning ability. Methods : 22 male rats(Sprague Dawley, weighting 180-280gm) were randomly assigned to PCPA or control group and treated with 300mg/kg of PCPA or saline i.p. at -72, -48, and -24 hrs. Number of segment(ACT0) entered with 4 limbs on the open field(L100×W100×H40cm, 25 segments), time(ANX0, sec) spent on the open arm(L110×W10cm, 50cm from the ground) in the elevated plus maze, and step-through latency(STL0, cut-off time : 300sec) in the shuttle box(L76.2×W34.3×H50.8cm, 7.5w electric bulb in the light chamber, 0.5mA for 3 sec in the dark chamber) were measured consequently at 24hrs after the last injection of PCPA or saline. After 20min of rest, animals were forced to swim for 15 min(cylinder : φ18×H40cm ; water : H15cm, 25℃). On the next day, the second trial of open field test(ACT1), elevated plus maze test(ANX1), passive avoidance learning test(STL1), and measurement of total immobility time(IT, sec) during the 5min of forced swim were done in the same manner as the first trial except that electrical shock was not given to the animals in the passive avoidance learning test and duration of forced swimming was shortened from 15min to 5min. To evaluate longterm effect of PCPA on maintenance of memory, measurement of step-through latency was repeated 7 days after the first trial(STL7). Result: 1) ACT1 was significantly decreased in the pooled sample, but the effect of PCPA on the general motor activity was not significant. 2) PCPA significantly prolonged the time spent on the open arms in the elevated plus maze test. 3) Comparing to STL0, STL1 was significantly prolonged in both groups. PCPA did not affect STL0 or STL1. STL7 was significantly prolonged in the control group, but not in the PCPA group. 4) PCPA shortened IT significantly. Conclusion : PCPA-induced decrease of immobility time during the forced swimming test in rats seems to be related with disinhibition of stress-related behavioral suppression. PCPA does not affect acquisition and short-term maintenance of passive avoidance learning, but necessity of further studies about its effect on long-term maintenance on memory is raised.