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국내 분리 encephalomyocarditis virus의 실험적 감염 Syrian hamster에 대한 병리학적 및 면역조직화학적 연구
윤원기,조성환,Yoon, Won-kee,Cho, Sung-whan 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.2
To elucidate pathogenicity to hamster of encephalomyocarditis virus $K_3$ strain that was isolated in Korea from the swine with reproductive failures, adult male syrian hamsters were experimentally infected intraperitoneally with the virus at $10^{7.0}\;TCID_{50}/0.1ml$ and pathological and immunohistochemical studies were performed. The results obtained through the experiment were as follows. 1. Clinical signs such as depression, unkempt hair and bilateral parlysis of hind limbs were observed. 2. At necropsy, mild congestion was observed in the cerebrum, liver, kidney and lung, and atrophy was evident in testis. 3. In microscopic observation, degeneration and necrosis of the nervous cells and perivascular mononuclear cell infiltration were manifested in central nerve system, and various degrees of degeneration and necrosis of parenchymal cells were detected in pancreas, lacrimal gland, liver, kidney and testis. 4. In immunohistochemical observation, strong positive reactions were observed in degenerated parenchymal cell of testis, and weak positive reactions, in hepatocytes.
Effects of serum on lymphokines producing capabilities of CD8<sup>+</sup> T cells
류시윤,윤원기,조성환,김무강,김태환,Ryu, Si-yun,Yoon, Won-kee,Cho, Sung-whan,Kim, Moo-kang,Kim, Tae-hwan The Korean Society of Veterinary Science 1994 大韓獸醫學會誌 Vol.34 No.3
serum factor가 $CD8^+$ T cell의 lymphokine 생산양상에 미치는 영향을 알아보기 위하여 13-20주령의 BAL B/C 마우스로 부터 $CD8^+$ T cell를 분리한 후 serum-containing medium과 serum-free medium을 사용하여 배양하였다. serum-free medium에서 배양한 $CD8^+$ T cell이 분비하는 lymphokine의 양은 serum-containg medium에서의 결과와는 달리 IL-2의 생산양은 낮았으나 IFNr의 생산양은 상당히 높았다. 이와같은 결과로 미루어 serum-derived factor가 $CD8^+$ T cell의 lymphokine 생산에 영향을 미친다고 생각된다. The responsiveness of $CD8^+$ T-cell subpopulation according to serum-containing and serum-free conditions were investigated. Cells are freshly isolated from spleen of mature adult BALB/C mice between 13-20 weeks of age. $CD8^+$ T cells in serum-free conditions produce small amounts of IL-2, while significant amounts of IFNr following activation when compared the results of serum-containing conditions. These data indicate that serum-derived factors may play an important role in the alternations of $CD8^+$ T cell responsiveness.
Caffeine이 N-bis(2-hydroxypropyl)nitrosamine과 sulfadimethoxine에 의해 유발된 갑상선 피막의 섬유성 증식에 미치는 영향
손화영,윤원기,지영흔,류시윤,김정란,조성환,Son, Hwa-young,Yoon, Won-kee,Jee, Young-heun,Ryu, Si-yoon,Kim, Jung-ran,Cho, Sung-whan 대한수의학회 2003 大韓獸醫學會誌 Vol.43 No.4
Caffeine (1,3,7-trimethylxanthine), a central nervous system stimulant, is contained in various foods, beverages and over-the-counter medications. Sulfadimethoxine (SDM) is one of the anti-thyroid agents and induces proliferation of thyroid capsule in two stage thyroid carcinogenesis model using N-bis(2-hydroxypropyl)nitrosamine (DHPN). In this study, we examined the effect of caffeine on fibrous proliferation of thyroid capsule in DHPN and SDM-treated rats. Five-week-old male F344 rats were given a single subcutaneous injection of DHPN (2,800 mg/kg, body weight). Starting one week thereafter, SDM (1,000 ppm in drinking water) with or without caffeine (1,500 ppm in diet) was administered for 12 weeks. All animals were autopsied and histopathological examination of the thyroid glands was performed. Thyroid follicular proliferative changes were induced in all rats treated with DHPN+SDM. In addition, the proliferation of perithyroidal fibrous tissue and pleomorphic thyroid follicular cells within the capsule were observed in DHPN+SDM treated group. Caffeine would not be related to these lesions in this experimental condition. although pentoxifylline, a methyl xanthine derivative, has an anti fibrotic effects.
청서 시상하부의 growth hormone-releasing factor 및 somatostatin 면역반응신경세포의 분포
정영길,손화영,윤원기,김길수,원무호,류시윤,조성환,김무강,Jeong, Young-gil,Son, Hwa-young,Yoon, Won-kee,Kim, Kil-soo,Won, Moo-ho,Ryu, Si-yun,Cho, Sung-whan,Kim, Moo-kang 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.4
This study was attempted to investigate the topographical distribution, shape and immunoreactivity of growth hormone-releasing factor(GRF)- and somatostatin(SOM)-immunoreactive neurons in the hypothalamus of the Korean squirrels(Sciurus vulgalis coreae). For the light microscopical examination of immunohistochemistry, the brains were fixed with 4% paraformaldehyde solution by means of intracardiac perfusion. And the frozen sections($40{\mu}m$ thick) were stained immunohistochemically by ABC method. Distribution of GRF immunoreactive neurons($12-17{\mu}m$) was highest in the paraventricular nucleus, moderate in the periventricular and supraoptic nuclei, and low in the arcuate nucleus and lateral hypothalamic area. Their immunoreactive fibers were found very high in the median eminence, moderately in the supraoptic, paraventricular and periventricular nuclei, and low in the arcuate nucleus and lateral hypothalamic area. SOM immunoreactive perikarya($14-18{\mu}m$) were found moderately in the periventricular nucleus near the subependymal layer of the third ventricle, and low in the arcuate and suprachiasmatic nuclei. SOM immunoreactive fibers were found high in the median eminence, and moderately or low in the arcuate and periventricular nuclei.
Effects of Oral Ethanol Ingestion on Hypertension in Spontaneously Hypertensive Rats
Chul-Ho Lee(이철호),Won-Kee Yoon(윤원기),Kyu-Shik Jeong(정규식),Yang-Kyu Choi(최양규),Yong-Joon Kim(김용준),Youn-Yi Nam(남윤이),Sang-Joon Park(박상준),Young-Gil Jeong(정영길),Moo-Kang Kim(김무강),Byung-Hwa Hyun(현병화) 한국실험동물학회 1997 Laboratory Animal Research Vol.13 No.1
야생등줄쥐 흑색질 및 배쪽피개의 dopamine성 신경세포
정영길,김길수,이철호,윤원기,현병화,오양석,원문호,김무강,Jeong, Young-gil,Kim, Kil-soo,Lee, Chul-ho,Yoon, Won-kee,Hyun, Byung-hwa,Oh, Yang-seok,Won, Moo-ho,Kim, Moo-kang 대한수의학회 1997 大韓獸醫學會誌 Vol.37 No.3
The distributions characteristics of neurons displaying immunoreactivity to the catecholamine synthetic enzymes, tyrosine hydroxylase(TH), dopamine-${\beta}$-hydroxylase(DBH), and phenylethanolamine-N-methyltransferase(PNMT) were examined in the adjacent sections of the substantia nigra & ventral tegmentum of the Striped Field Mouse(Apodemus agrarius coreae). None of these cell groups displayed either DBH or PNMT immunoreactivity. Many TH-immunoreactive neurons were present in the substantia nigra & ventral tegmentum. The major dopaminergic cell(TH-positive, DBH- & PNMT-negative) group in the midbrain was present in the pars compacta of substantia nigra and adjacent ventral tegmentum. And smaller dopaminergic cell groups Were found in the pars reticulata of the substantia nigra and central liner nucleus.
유전자 변형 탄저병 저항성 고추(PepEST gene)가 비표적 곤충인 복숭아혹진딧물(Myzus persicae Sulzer)에 미치는 영향
박지은,이훈복,김창기,정순천,윤원기,박기웅,이범규,김환묵,Park, Ji-Eun,Yi, Hoon-Bok,Kim, Chang-Gi,Jeong, Soon-Chun,Yoon, Won-Kee,Park, Kee-Woong,Lee, Bum-Kyu,Kim, Hwan-Mook 한국응용곤충학회 2007 한국응용곤충학회지 Vol.46 No.3
탄저병에 저항성을 가진 특정 유전자 esterase gene (PepEST)을 삽입한 유전자 변형 작물 PepEST (line 68) 고추가 비표적 생물체인 복숭아혹진딧물의 생장에 미치는 영향을 알아보기 위하여 복숭아혹진딧물 성충의 발육 및 산자수 등을 온도 $25^{\circ}C$, 상대습도 50-70%, 광주기 L16 : D8의 실험실 조건에서 조사하고 생명표를 작성하였다. 총 3회의 실험에서 순생산률($R_0$), 증가율($r_m$), 평균 재생산 기간(T), 총 생산량, 수명, 세대기간 등을 각각 산출하였다. 그 결과 수명은 세 번의 실험에서 각각 31일, 27일, 25일로 나타나 복숭아혹진딧물의 일반적인 평균 수명인 25-29일을 기준으로 유전자변형 고추와 모본 고추 모두에서 유의한 차이를 나타내지 않았다. 최초 산자일 또한 세 번의 실험 모두 유전자변형 고추와 모본 고추간에 차이를 나타내지 않았다(P>0.05). 반면, 총 산자수의 값과 Jackknife로 계산된 순생식률($R_o$)의 값은 유전자변형 고추보다 모본 고추에서 높은 결과를 나타냈다(P<0.05). 결과적으로 본 조사로 인해 Esterase gene PepEST를 삽입한 유전자 변형 작물이 복숭아혹진딧물의 산자수에 영향을 미치는 결과를 가져왔고, 유사한 방법의 실험을 야외에서 수행할 필요가 있을 것으로 본 연구는 제안한다. To assess the environmental risks of transgenic chili pepper with PepEST gene on non-target organisms before it exposes to the agro-ecosystem environments, we conducted the three sets of green peach aphids (Myzus persicas S.) life table experiment under laboratory conditions (Temp. $25^{\circ}C$, R.H. 50-70%, Photoperiod L16 : D8) in series during 2005-2006. We measured the net reproductive rate ($R_0)^*$, the intrinsic rate of increase ($r_m$), the mean generation time ($T_c$), $fecundity^*$, life span, and reproduction period between non-transgenic chili peppers and transgenic chili peppers, respectively. The life span of green peach aphids from three sets was 31, 27, 25 days, and the period of life span was similar to the general average length of green peach aphids, 25-29 days. Although the first reproduction of transgenic pepper was similar to the non transgenic pepper (P>0.05), the fecundity and the net reproductive rate ($R_o$) by using Jackknife method of transgenic pepper were lower than those of non transgenic pepper (P<0.05). Conclusively, we observed the adverse effect from our results but we should execute further experiments to confirm the results at the fields with the similar way.