• Title/Summary/Keyword: Infiltration volume

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Analysis of Rainfall Runoff Reduction Effect Depending upon the Location of Detention Pond in Urban Area (도시유역 저류지 위치에 따른 우수유출저감효과 분석)

  • Lee, Jae Joon;Kim, Ho Nyun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.5B
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    • pp.535-546
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    • 2008
  • Urbanization results in increased runoff volume and flowrate and shortening in time of concentration, which may cause frequent flooding downstream. The retardation structures are used to eliminate adverse downstream effects of urban stormwater runoff. There are various types of flow retardation measures include detention basin, retention basin, and infiltration basin. In this study, to present a rough standard about location of detention pond for attenuating peak flow of urban area, the runoff reduction effect is analyzed at outlet point when detention pond is located to upstream drainage than outlet. The runoff reduction effects are analyzed under the three assumed basins. These basins have longitudinal shape (SF = 0. 204), concentration shape (SF = 0. 782), and middle shape (SF = 0.567). Numerous variables in connection with the storage effect of detention pond and the runoff reduction effects are analyzed by changing the location of detention pond. To analyze runoff reduction effect by location of single detention pond, Dimensionless Upstream Area Ratio (DUAR) is changed to 20%, 40%, 60%, and 80% according to the basin shape. In case of multiple detention pond, DUAR is changed to 60%, 80%, 100%, 120%, and 140% only under the middle shape basin (SF = 0.567). Related figures and regression equations to determine the location of detention pond are obtained from above analysis of two cases in this study. These results can be used to determine the location of appropriate detention pond corresponding to the any runoff reduction such as storage ratio and peak flow ratio in urban watershed.

Inflammatory Reponse of the Lung to Hypothermia and Fluid Therapy after Hemorrhagic Shock in Rats (흰쥐에서 출혈성 쇼크 후 회복 시 저체온법 및 수액 치료에 따른 폐장의 염증성 변화)

  • Jang, Won-Chae;Beom, Min-Sun;Jeong, In-Seok;Hong, Young-Ju;Oh, Bong-Suk
    • Journal of Chest Surgery
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    • v.39 no.12 s.269
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    • pp.879-890
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    • 2006
  • Background: The dysfunction of multiple organs is found to be caused by reactive oxygen species as a major modulator of microvascular injury after hemorrhagic shock. Hemorrhagic shock, one of many causes inducing acute lung injury, is associated with increase in alveolocapillary permeability and characterized by edema, neutrophil infiltration, and hemorrhage in the interstitial and alveolar space. Aggressive and rapid fluid resuscitation potentially might increased the risk of pulmonary dysfunction by the interstitial edema. Therefore, in order to improve the pulmonary dysfunction induced by hemorrhagic shock, the present study was attempted to investigate how to reduce the inflammatory responses and edema in lung. Material and Method: Male Sprague-Dawley rats, weight 300 to 350 gm were anesthetized with ketamine(7 mg/kg) intramuscular Hemorrhagic Shock(HS) was induced by withdrawal of 3 mL/100 g over 10 min. through right jugular vein. Mean arterial pressure was then maintained at $35{\sim}40$ mmHg by further blood withdrawal. At 60 min. after HS, the shed blood and Ringer's solution or 5% albumin was infused to restore mean carotid arterial pressure over 80 mmHg. Rats were divided into three groups according to rectal temperature level($37^{\circ}C$[normothermia] vs $33^{\circ}C$[mild hypothermia]) and resuscitation fluid(lactate Ringer's solution vs 5% albumin solution). Group I consisted of rats with the normothermia and lactate Ringer's solution infusion. Group II consisted of rats with the systemic hypothermia and lactate Ringer's solution infusion. Group III consisted of rats with the systemic hypothermia and 5% albumin solution infusion. Hemodynamic parameters(heart rate, mean carotid arterial pressure), metabolism, and pulmonary tissue damage were observed for 4 hours. Result: In all experimental groups including 6 rats in group I, totally 26 rats were alive in 3rd stage. However, bleeding volume of group I in first stage was $3.2{\pm}0.5$ mL/100 g less than those of group II($3.9{\pm}0.8$ mL/100 g) and group III($4.1{\pm}0.7$ mL/100 g). Fluid volume infused in 2nd stage was $28.6{\pm}6.0$ mL(group I), $20.6{\pm}4.0$ mL(group II) and $14.7{\pm}2.7$ mL(group III), retrospectively in which there was statistically a significance between all groups(p<0.05). Plasma potassium level was markedly elevated in comparison with other groups(II and III), whereas glucose level was obviously reduced in 2nd stage of group I. Level of interleukine-8 in group I was obviously higher than that of group II or III(p<0.05). They were $1.834{\pm}437$ pg/mL(group I), $1,006{\pm}532$ pg/mL(group II), and $764{\pm}302$ pg/mL(group III), retrospectively. In histologic score, the score of group III($1.6{\pm}0.6$) was significantly lower than that of group I($2.8{\pm}1.2$)(p<0.05). Conclusion: In pressure-controlled hemorrhagic shock model, it is suggested that hypothermia might inhibit the direct damage of ischemic tissue through reduction of basic metabolic rate in shock state compared to normothermia. It seems that hypothermia should be benefit to recovery pulmonary function by reducing replaced fluid volume, inhibiting anti-inflammatory agent(IL-8) and leukocyte infiltration in state of ischemia-reperfusion injury. However, if is considered that other changes in pulmonary damage and inflammatory responses might induce by not only kinds of fluid solutions but also hypothermia, and that the detailed evaluation should be study.

Analysing the effect of impervious cover management techniques on the reduction of runoff and pollutant loads (불투수면 저감기법의 유출량 및 오염부하량 저감 효과 분석)

  • Park, Hyung Seok;Choi, Hwan Gyu;Chung, Se Woong
    • Journal of Environmental Impact Assessment
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    • v.24 no.1
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    • pp.16-34
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    • 2015
  • Impervious covers(IC) are artificial structures, such as driveways, sidewalks, building's roofs, and parking lots, through which water cannot infiltrate into the soil. IC is an environmental concern because the pavement materials seal the soil surface, decreasing rainwater infiltration and natural groundwater recharge, and consequently disturb the hydrological cycle in a watershed. Increase of IC in a watershed can cause more frequent flooding, higher flood peaks, groundwater drawdown, dry river, and decline of water quality and ecosystem health. There has been an increased public interest in the institutional adoption of LID(Low Impact Development) and GI(Green Infrastructure) techniques to address the adverse impact of IC. The objectives of this study were to construct the modeling site for a samll urban watershed with the Storm Water Management Model(SWMM), and to evaluate the effect of various LID techniques on the control of rainfall runoff processes and non-point pollutant load. The model was calibrated and validated using the field data collected during two flood events on July 17 and August 11, 2009, respectively, and applied to a complex area, where is consist of apartments, school, roads, park, etc. The LID techniques applied to the impervious area were decentralized rainwater management measures such as pervious cover and green roof. The results showed that the increase of perviousness land cover through LID applications decreases the runoff volume and pollutants loading during flood events. In particular, applications of pervious pavement for parking lots and sidewalk, green roof, and their combinations reduced the total volume of runoff by 15~61 % and non-point pollutant loads by TSS 22~72 %, BOD 23~71 %, COD 22~71 %, TN 15~79 %, TP 9~64 % in the study site.

Comparison of Two Methods of Recruiting the Acutely Injured Lung (급성 폐손상에서 폐를 Recruit시키는 방법간의 비교 연구)

  • Suh, Gee-Young;Kang, Kyeong-Woo;Park, Sang-Joon;Kim, Ho-Choel;Young, Lim-Si;Chung, Man-Pyo;Han, Jeong-Ho;Kim, Ho-Joong;Kwon, O-Jung;Rhee, Chong-H.
    • Tuberculosis and Respiratory Diseases
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    • v.48 no.4
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    • pp.500-512
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    • 2000
  • Background : To evaluate the efficacy of two methods of obtaining lung recruitment to reduce ventilator-induced lung injury(VILI). Methods : Fifteen New-Zealand white rabbits were ventilated in the pressure-controlled mode while maintaining constant tidal volume(10 ml/kg) and fixed respiration rate. Lung injury was induced by repeated saline lavage (PaO2<100 mmHg), and the pressure-volume curve was drawn to obtain Pflex. The animals were then randomly assigned to three groups and ventilated for 4 hours. In the control group(n=5), positive end-expiratory pressure(PEEP) less than that of Pflex by 3 mmHg was applied throughout the study. In the recruitment maneuver(RM) group(n=5), RM(CPAP of 22.5 mmHg, for 45 seconds) was performed every 15 minutes in addition to PEEP level less than Pflex by 3 mmHg This phrase is unclear. In the Pflex group, PEEP of Pflex was given without RM. Gas exchange, lung mechanics, and hemodynamics parameters as well as pathology were examined. Results : 1) Both the control and RM groups showed decreasing tendency in PaO2 with time. There was significantly decreased PaO2 at 4 hr compared to Ihr(p<0.05). But in the Pflex group, PaO2 did not decrease with time(p<0.05 vs other groups at 3, 4 hr). PaCO2 did not show significant difference among the three groups. 2) There was no significant difference in static compliance and plateau pressure. Mean blood pressure and heart rate also did not show any significant difference among the three groups. 3) The pathologic exam showed significantly less neutrophil infiltration in the Pflex group than in the control group(p<0.05). There was borderline significant difference in hyaline membrane score among the groups (p= 0.0532). Conclusion : Although recruitment maneuver of the injured lung may be important in decreasing VILI, it alone may not be sufficient to minimize VILI.

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Effects of Boyanghwano-Tang on the Development of Experimentally-induced Endometriosis in the Rats (보양환오탕(補陽還五湯)이 실험적으로 유발된 흰쥐의 자궁내막증에 미치는 영향)

  • Lim, Sung-Min;Lee, Dong-Nyung;Seo, Il-Bock;Kim, Hyung-Jun
    • The Journal of Korean Obstetrics and Gynecology
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    • v.23 no.3
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    • pp.56-77
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    • 2010
  • Purpose: This study was performed to investigate effects of Boyanghwano-Tang on the development of experimentally-induced endometriosis in rats. Methods: Endometriosis was induced in rats by autotransplanting uterine tissue to the peritoneum and divided them into three groups: (1) sham-operated group(n=8), (2) surgically induced endometriosis and untreated control group (n=8), (3) surgically induced endometriosis and Boyanghwano-Tang treated group. Boyanghwano-Tang was orally administrated for 15 days after operation. Then we measured the body weight, the volume of endometriotic implants, the weight of uterus and ovary, and investigated the concentration of cytokines (MCP-1, TNF-$\alpha$, IL-$1{\beta}$, IL-6) in peritoneal fluids. Histopathology, immunohistochemistry for COX-2 and VEGF, and histochemistry for mast cell in transplanted uterine tissue were performed. Results: - The volume($mm^3$) of endometriotic implants in Boyanghwano-Tang treated group ($122.3{\pm}45.0$) was significantly decreased(p<0.05) compared with control group($222.1{\pm}109.1$). - The concentration(pg/$m{\ell}$) of MCP-1 in peritoneal fluids in Boyanghwano-Tang treated group($1026.3{\pm}196.5$) was significantly decreased(p<0.05) compared with control group($1412.5{\pm}345.7$). - The concentration(pg/$m{\ell}$) of TNF-$\alpha$ in peritoneal fluids in Boyanghwano-Tang treated group($936.5{\pm}94.3$) was significantly decreased(p<0.01) compared with control group($1126.2{\pm}139.9$). - The concentration(pg/$m{\ell}$) of IL-$1{\beta}$ in peritoneal fluids in Boyanghwano-Tang treated group($78.5{\pm}13.3$) was significantly decreased(p<0.01) compared with control group($105.3{\pm}17.6$). - The concentration(pg/$m{\ell}$) of IL-6 in peritoneal fluids in Boyanghwano-Tang treated group($107.4{\pm}15.8$) was decreased compared with control group($122.8{\pm}19.3$). - Histopathologically, proliferation of endometriotic epithelia, infiltration of inflammatory cells and angiogenesis in transplanted uterine tissue of Boyanghwano-Tang treated group were weakly observed than those of control group. - The percentage of positive epithelial layers for COX-2 in Boyanghwano-Tang treated group($51.5{\pm}14.1$) was significantly decreased(p<0.01) compared with control group($75.1{\pm}16.3$). - The VEGF expression of endometriotic epithelia, neovascular endothelia and stromal cells in transplanted uterine tissue of Boyanghwano-Tang treated group were weakly observed than those of control group. - The number of mast cells in adjacent tissue of transplanted uterine tissue in Boyanghwano-Tang treated group($75.9{\pm}13.1$) was decreased compared with control group($91.0{\pm}28.3$). Conclusion: On the basis of these results, we concluded that Boyanghwano-Tang have inhibiting effects on the development of transplanted uterine tissue. And these effects may be related with decreased production of MCP-1, TNF-$\alpha$, IL-$1{\beta}$ and decreased expression of COX-2 and VEGF by administration of Boyanghwano-Tang.

Effect of Carriers on Residue of Wetting Agent Containing Polyoxyethylene Laury Ether, Initial Wetting and Water Movement in Container Media (증량제의 종류가 Polyoxyethylene Laury Ether를 포함한 토양습윤제의 상토 내 잔류성, 상토의 수분 보유 및 이동에 미치는 영향)

  • Choi, Jong Myung;Chung, Hae Joon;Shim, Jai Sung
    • Horticultural Science & Technology
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    • v.19 no.4
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    • pp.596-601
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    • 2001
  • This study was carried out to determine the effect of base carriers such as zeolite or vermiculite on change of concentration of polyoxyethylene laury ether[$C_{12}H_{25}O(C_{2}H_{4}O)_{3}H$, PLE] and on initial wetting of peat-vermiculite medium in the development of a soil wetting agent using the mixture of PLE and polyoxyethylene+polyppro-pyleneoxide tridecylether (1:1, w/w, CM-1). The concentration of PLE in the treatment of vermiculite was higher than that of zeolite during the period from 2 to 6 weeks. The cumulative concentration of PLE released in the treatment of vermiculite was about $2800mg{\cdot}L^{-1}$ and zeolite was about $2300mg{\cdot}L^{-1}$. The treatments of PLE+CM-1 with zeolite or vermiculite as a carrier were effective in initial water retention of root media having more than 510 mL of water per pot, where as those of $AquaGro^{G}$ and control had 490 mL and 400 mL of water per pot, respectively. In the evaporative water loss, the treatment of zeolite and $AquaGro^{G}$ were faster than that of control and vermiculite. The control treatment had the fastest water movement in and the highest volume of water infiltrating into root medium among all treatments. Increased application rate of PLE+CM-1 did not increase water retention capacity. The treatment of $0.6g{\cdot}L^{-1}$ had the highest evaporative water loss and that of $0.3g{\cdot}L^{-1}$ had the highest amount of water infiltrating into root media among all other treatments.

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Interstitial Hyperthermia by Radiofrequency Needle Electrode System : Phantom and Canine Brain Studies (8 MHz 라디오파를 이용한 자입식 온열치료 -조직등가물질을 통한 온도분포 및 개 뇌실질의 조직병리 변화에 관한 연구-)

  • Lee, Hyung-Sik;Chu, Sung-Sil;Sung, Jin-Sil;Suh, Chang-Ok;Kim, Gwi-Eon;Loh-John-Juhn-Kyu;Kim, Young-Soo;Kim, Sun-Ho;Chung, Song-Sup;Han, Eun-Kyung;Kim, Tae-Seung
    • Radiation Oncology Journal
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    • v.9 no.1
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    • pp.27-35
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    • 1991
  • An interstitial radiofrequency needle electrode system was constructed for interstitial heating of brain tissue. Radiofrequency electrodes with Thermotron RF 8 were tested in an agar phantom and in a normal canine brain to determine how variations in physical factors affected temperature distributions. Temperature distributions were checked after heating with 1 mm diameter needle electrode implants on the corners of 1 and 2 cm squares in a phantom and plot isotherms for various electrodes arrangement. We observed that the 1 cm square array would heat a volume with a 1.25 cm radius circular field cross section to therapeutic temperatures ($90\%$ relative SAR using Tm) and the 2 cm square array with a 1.75 cm radius rectangular field with central inhomogeneity. With 2 cm long electrode implants, we observed that the 1 cm square array would heat a 3 cm long sagittal section to therapeutic temperature ($90\%$ relative SAR using Tm). We found that radiofrequency electrodes could be selected to match the length of the heating area without affecting its performance. The histopathological changes associated with RF heating of normal canine brains have been correlated with thermal distributions. RF needle electrode heating was applied for 50min to generate tissue temperatures of $43^{\circ}C$. We obtained a quarter of the heated tissue material immediately after heating and sacrificed at intervals from $7\sim30$days. The acute stage (immediately after heating) was demonstrated by liquefactive necrosis, pyknosis of neuronal element in the gray matter and by some polymer-phonuclear leukocytes infiltration. The appearance of lipid-laden macrophages surrounding the area of liquefaction necrosis was demonstrated in all three sacrificed dogs. Mild gliosis occurring around the necrosis was demonstrated in the last sacrificed (Days 30) canine brain.

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Resting Energy Expenditure in Patients with Lung Cancer (폐암 환자의 안정시 에너지 소비)

  • Lee, Jae-Lyun;Kim, Ki-Beom;Lee, Hak-Jun;Jung, Jin-Hong;Lee, Kwan-Ho;Lee, Hyun-Woo
    • Tuberculosis and Respiratory Diseases
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    • v.44 no.5
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    • pp.1019-1029
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    • 1997
  • Background : Elevation of resting energy expenditure(REE) in patients with lung cancer has been described in earlier studies and may contribute to cancer cachexia, but limited information is available regarding the prevalence and determinants of the increased REE. The aim of this study was to assess the prevalence and contributing factors of a hypermetabolic state in newly detected patients with lung cancer and to assess the energy balance in order to improve our knowledge about weight loss in patients with lung cancer. Method : Thirty one consecutive, newly detected patients with lung cancer and 20 control patients with benign lung diseases were included in this study. Resting energy expenditure(REE) was measured by indirect calorimetry using ventilated hood system and predicted REE was calculated by the Harris-Benedict formular. Results : The energy balance in newly detected lung cancer patients was disturbed in a high proportion of patients, and hypermetabolic state occurred in 61% of the patients. Tumor volume, cancer type, location, stage, the presence of atelectasis or infiltration, pulmonary function, or smoking behavior were not associated with increase in REE. But patients with distant metastasis had significantly higher REE comparing with patients without metastasis. Thirty nine percents of the patients with lung cancer had substantial loss of more than 10% of their pre-illness weight. Weight losing patients with lung cancer were not accompanied by an increase in REE. Conclusion : We concluded that the REE was elevated in a higher proportion of patients with lung cancer and distant metastasis was found to be contributing factor to the elevated REE.

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Animal Experiments on an Antithrombogenic Small-Caliber Vascular Prostheses and Vascualr Patch : Observation in Canine Models (항혈전성 소구경 인조 혈관 및 봉합편에 대한 동물 실험)

  • 김수철;김원곤;유세영
    • Journal of Chest Surgery
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    • v.36 no.2
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    • pp.63-72
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    • 2003
  • Although a variety of synthetic vascular grafts are available in modern vascular surgery, no ideal prosthesis ha,4 yet been developed. Small-caliber vascular grafts with low flow, as used in the lower extremity, continue to become thrombosed at unacceptable rates. We have developed and evaluated the new antithrombogenic blood contacting surfaces in canine model. Material and Method: Two now antithrombogenic blood contacting surfaces(Polyvinylalcohol -Polyurethane(PVA-PU) blend and natural Graphite-polyurethane(G-PU) blend) have been developed and evaluated in canine model, using vascular grafts and patches. The luminal surfaces of the test vascular grafts(5 mm ID) were fabricated by dipping a glass rod in PVA-PU blend solution(50 % PVA) using phase separation method. Mongrel dogs of either sex weighing 18-22 kg were anesthetized by endotracheal intubation using halothane and their lungs were ventilated with a volume-cycled ventilator, Maintenance anesthesia with 0.5-1.0% halothane and supplemental oxygen was used. Two pairs were used for comparison in the bilateral femoral arteries for both vascular grafts(PVA-PU vs. PU) and vascular patches(G-PU vs. PU). Bilateral groin incisions were made and the arteries were exposed and clamped. After an excision of 1 cm of the artery between clamps, a grail of 2.5 cm in length was implanted end-to-end using 6-0 polypropylene suture. The vascular patch was implanted as a form of on-lay patch. Animals were sacrificed at 1, 2, 4, 6, 8 and 16 weeks for vascular grafts and 1, 2. 4 and 6 weeks for vascular patches. Result The vascular grafts of PVA-PU blends showed patent lumina in the 2 and 16 weeks animals, while those of PU showed a patent lumen in 2 weeks animal. PVA-PU graft of 16 weeks showed a fairly clean luminal surface. A light microscopic finding of this graft demonstrated good tissue infiltration through porosity, The animals with vascular patches showed patent arteries in both groups except 2 weeks animal. Scanning electron microscopy of the luminal surfaces of G-PU patches in 4 and 6 weeks animals showed endothelial cell covering with microvilli. PU patches showed qualitatively less endothelial cell covering. Conclusion: In conclusion, PVA-PU and G-PU blends can be a promising blood contacting surfaces for application in a synthetic vascualr graft. However, further animal study is needed to determine the real long-term effects of these methods of surface modifications.

Inhibiting Effecposets of Gungguijohyeoleum on the Development of Experimentally-induced Endometriosis in the Rats (궁귀조혈음(芎歸調血飮)이 흰쥐의 자궁내막증 형성 억제에 미치는 영향)

  • Choi, Byun-Tak;Seo, Il-Bock;Lee, Dong-Nyung;Kim, Hyung-Jun
    • The Journal of Korean Obstetrics and Gynecology
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    • v.21 no.3
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    • pp.34-59
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    • 2008
  • Purpose: This study was performed to investigate the inhibiting effects of Gungguijohyeoleum on the development of experimentally-induced endometriosis in rats. Methods: Endometriosis was induced in rats by autotransplanting uterine tissue to the peritoneum and we divided them into three groups: (1) sham-operated group(n=8), (2) surgically induced endometriosis and untreated control group(n=8), (3) surgically induced endometriosis and Gungguijohyeoleum treated group(n=8), Gungguijohyeoleum was orally administrated for 15 days after operation. Then we measured the body weight, the volumes of endometriotic implants, the weight of uterus and ovary, and investigated the concentrations of cytokines(MCP-1, $TNF-{\alpha}$, $IL-1{\beta}$, IL-6) in peritoneal fluids. Histopathology, immunohistochemistry for COX-2 and VEGF, and histochemistry for mast cell in transplanted uterine tissue were performed. Results: - The volume ($mm^3$) of endometriotic implants in Gungguijohyeoleum treated group ($76.4{\pm}24.5$) was significantly decreased(p<0.05) compared with control group($222.1{\pm}109.1$). - The concentration (pg/ml) of MCP-1 in peritoneal fluids in Gungguijohyeoleum treated group ($1060.8{\pm}280.8$) was significantly decreased(p<0.05) compared with control group($1412.5{\pm}345.7$). - The concentration (pg/ml) of $TNF-{\alpha}$ in peritoneal fluids in Gungguijohyeoleum treated group ($827.5{\pm}219.9$) was significantly decreased(p<0.01) compared with control group($1126.2{\pm}139.9$). - The concentration (pg/ml) of $IL-1{\beta}$ in peritoneal fluids in Gungguijohyeoleum treated group($83.4{\pm}9.0$) was significantly decreased(p<0.01) compared with control group($105.3{\pm}17.6$). - The concentration (pg/ml) of IL-6 in peritoneal fluids in Gungguijohyeoleum treated group($108.9{\pm}15.7$) was decreased compared with control group($122.8{\pm}19.3$). - Histopathologically, proliferation of endometriotic epithelia, infiltration of inflammatory cells and angiogenesis in transplanted uterine tissue of Gungguijohyeoleum treated group were weakly observed than those of control group. - The percentage(%) of positive epithelial layers for COX-2 in Gungguijohyeoleum treated group($56.8{\pm}12.8$) was significantly decreased(p<0.01) compared with control group($75.1{\pm}16.3$). -The VEGF expression of endometriotic epithelia, neovascular endothelia and stromal cells in transplanted uterine tissue of Gungguijohyeoleum treated group was weakly observed than that of control group. - The numbers of mast cells in transplanted uterine tissue in Gungguijohyeoleum treated group($35.4{\pm}18.4$) were significantly decreased(p<0.01) compared with control group ($91.0{\pm}28.3$). Conclusion: On the basis of these results, we concluded that Gungguijohyeoleum has inhibiting effects on the development of transplanted uterine tissue. And these effects may be related with decreased production of MCP-1, $TNF-{\alpha}$, $IL-1{\beta}$, COX-2, VEGF and mast cells by administration of Gungguijohyeoleum.

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