• 한국수의병리학회지
• /
• 제5권2호
• /
• pp.35-38
• /
• 2001

Two cases of spontaneous auricular chondritis were reported in SD rats in a 13-week toxicity study. At necropsy, pinna of each rats had fm, irregular nodules. Based on the anatomical location and histopathological features of the lesion, the disease was diagnosed as auricular chondritis.

• 약학회지
• /
• 제43권1호
• /
• pp.91-97
• /
• 1999

Dietary hypertension induced by feeding cholesterol and vitamin D3 in rats for 7 weeks was prevented by the addition of fursulthiamine and diallyl disulfide in the diet. In the isolated preparation of the hypertentive rats, the contractile forces were potentiated by norepinephrine, serotonin and potassium chloride, as compared to that of the normotensive rats. However, the increased contractile forces of the hypertensive rats were inhibited in the aorta of the rats fed with fursulthiamine. Decreases in triglyceride contents were observed in the sera of the hypertensive rats fed with fursulthiamine. Therefore, it is suggested that dietary hypertension in rats may be prevented by supplement of fursulthiamine in the diet.

• 약학회지
• /
• 제39권6호
• /
• pp.654-660
• /
• 1995

The present study was attempted to investigate the mechanism of oxidative cellular injuries which occur in diabetic rats by determining changes of antioxidant enzymes activity in the lung of alloxan-induced diabetic rats, the contents of glutathione in the lung, liver, blood samples, and ${\gamma}$-glutamylcysteine synthetase activities in the liver. Superoxide dismutase activities (SOD), including Cu, Zn-SOD and Mn-SOD, decreased in the lung of diabetic rats compared with those of normal control rats. However, activities of catalase and glutathione peroxidase(GPX) activities were not affected in the lung of diabetic rats. In diabetic rats, glutathione contents in the lung, liver, and blood samples, as well as the activities of ${\gamma}$-glutamylcysteine synthetase in the livers which is known to be the key enzyme of glutatione biosynthesis, decreased significantly. From these experimental results, it is thought that the decrease in SOD activities in the lung, glutathione contents and ${\gamma}$-glutamylcysteine synthetase activities in some tissues in alloxan-induced diabetic rats may be the crucial cause of vullnerability to oxidative cellular injuries.

• Toxicological Research
• /
• 제12권2호
• /
• pp.237-241
• /
• 1996

To study an effect of toluene administration on the toluene metabolism in rats liver previously fed a low (casein 7%, LP) or standard (casein 20%, SP) protein diet, toluene (50% in olive oil) was given at 0.2 ml per 100 g body weights once daily during 4 days to the male rats. The content of hepatic cytochrome P-450 was higher in rats fed SP than those fed LP. The hepatic benzylalcohol dehydrogenase activity was higher both in toluene-treated rats and its control group fed SP than those fed LP. The hepatic benzaldehyde dehydrogenase activity was somewhat higher in rats fed SP than those fed LP. In the case of toluene treatment, the increasing rate of hippuric acid contents to the control group were higher in rats SP than those fed LP. In conclusion, it is likely that the metabolic rate of toluene would be higher in rats fed SP than those fed LP.

• 치과방사선
• /
• 제22권2호
• /
• pp.241-252
• /
• 1992

The purpose of this study was to investigate the changes of morphology and structure of bone tissue in the irradiated mandibular bone in rats which were fed a low calcium diet. In order to carry out this experimant, 64 seven-week old Sprague-Dawley strain rats weighing about 150gms were selected and equally divided into one experimental group of 32 rats and one control group with the remainder. The experimental group and the control group were then subdivided into two groups when the rats reached ten-week old, 16 were assigned rats for each subdivided group, exposed to irradiation. The two irradiation groups received a single dose of 20 Gy in the jaws area only and irradiated with a cobalt-60 teletherapy unit. The rats in the control and experimental groups were serially terminated by fours on the 3rd, the 7th, the 14th, and the 21st day after irradiation. Following termination, both sides of the dead rats mandibular bodies were removed and fixed with 10% neutral formalin. One side of the mandibular body was radiographed with a soft X-ray apparatus. Thereafter, the obtained microradiographs were observed by a light microscope. The remaining side of the mandibular bone was further decalcified and embedded in paraffin as using the general method. The specimen sectioned and stained with hematoxylin and eosin, and Rabit Anti-Human Tumor Necrosis Factor-a, observed by a light microscope. The obtained results were as follows: 1. Microradiogram revealed that thinning of the cortex and a decrease in the trabecula of the interradicular bone and mandibular body were observed and noted from the start to finish throughout the experiment in the non-irradiated rats on the low calcium diet rather than in the non-irradiated rats on the normal diet. In microscopic observations, there were marked osteolytic changes in the center of the bone marrow. 2. Microradiogram revealed that thinning of the cortex and a decrease in the trabecula of interradicular bone and mandibular body were more marked after 7 days in the irradiated rats on the low calcium diet rather than in the non-irradiated rats on the low clacium diet. In microscopic observations, osteoblasts were decreased markedly after 7 days, and a few osteoclasts were observed. 3. Microradiogram revealed that thinning of the cortex and a decrease in trabecula of interradicular bone and the mandibular body were more marked from the strart to finish troughout the experiment in the irradiated rats on the low calcium diet rather than in the irradiated rats on the normal diet. In microscopic observations, there were no osteolytic changes noted in the irradiated rats on the normal diet. 4. In immunocytochemical findings, a few bone marrow cells including Tumor Necrosis Factor were observed in the irradiated rats on the normal diet, but was not observed in the rats on the low calcium diet.

• Journal of Nutrition and Health
• /
• 제31권3호
• /
• pp.253-262
• /
• 1998

This study was performed to investigated the effect of dietary fat sources on renal senescence in aged rats. Seventeen month old male Sprague-Dawley rats were divided into 3 groups according to urinary protein excretion. Four month old rats were used as a control group. The rats were fed one of three different experimental diets ; 20% beef tallow, 20% corn oil 20% fish oil diet. They were fed experimental diets ad libitum for 16 weeks . The results are summarized as follows. Serum lipid concentrations were higher in aged rats than in control rats, with the beef tallow group showing the highest level, followed by the corn oil and fish oil groups. Old rats showed higher HDL and lower LDL levels than the control groups. Age and dietary fat had no effect on VLDL. GFR for the both age groups were increased with experimental period with the beef tallow group showing the highest value. Urinary protein excretion was also increased with experimental period in both age groups. There was a large increase in urinary protein in old rats that were fed beef tallow and corn oil, but not in old rats fed fish oil. On the contrary , the effect of dietary fat on urinary protein was not found in control groups. There was individual susceptibility in the effect of dietary fat on urinary protein. Old rats fed beef tallow with high initial urinary protein showed highest increase, but , the change was not significant in rats with a low initial value . It was also found that the increase was kept low in rats of the fish oil group with high initial urinary protein. The corn oil group showed in between values. There were no differences in urine and renal tissue concentrations of TXB2 . Aged rats showed a tendency of having higher urinary PGE2 excretion and lower renal cortex content. Since higher PGE2 excretion was reported to be associated with decreased renal function, this might suggest that the aged rats show renal function reduction. Light microscopic examination showed that glomerular segmental sclerosis, mesangial matrix expansion and tubular atrophy were more frequently present in aged rats, and that these changes were more significant in the beef tallow group, followed by corn oil and fish oil groups. The percentage of urinary protein excretion was increased in aged rats in association with increased glomerular sclerosis and mesangial matrix . This change could be partly due to a change in eicosanoids metabolism . Therefore, modification of dietary fat could affect the eicosanoids metabolism in kidney and renal senescence.

• 대한수의학회지
• /
• 제31권4호
• /
• pp.367-379
• /
• 1991

The purpose of this study was to investigate the effect of antioxidants (vitamin E, selenium, and coenzyme $Q_{10}$) on the bleomycin-induced pulmonary lesions in male rats. Sprague-Dawley male rats were divided into 4 treatment groups ($T_1$, $T_2$, $T_3$, $T_4$) and 4 control groups ($C_1$, $C_1$, $C_3$, $C_4$). The treatment groups of rats weie given a single intratracheal dose of bleomycin (1.5 units/rat) and control groups of rats were given a single intratracheal dose of normal saline (0.15ml/rat). The rats in the $T_1$ group and $C_1$, group were dosed with normal saline (0.5ml/kg/day), the rats in the $T_2$ group and $C_2$ group were dosed with vitamin E (50mg/kg/day), the rats in the $T_3$ group and $C_3$ group were dosed with sodium selenite (3mg/kg/day) and the rats in the $T_4$ gronp and $C_4$ group were dosed with coenzyme $Q_{10}$ (2.5mg/kg/day) intraperitoneally for 7 days or 14 days, respectively. Animals were killed at 7th and 14th day after dosing with bleomycin or saline. The results obtained were as follows: 1. Lung wet weight of treatment groups of rats was increased significantly while body weight gain of them was decreased significantly in comparison with that of control groups of rats (p<0.01). 2. The ratio(%) of lung wet weight to final body weight of treatment groups of rats was increased significantly in comparison with that of control groups of rats (p<0.01). 3. The main histopathological findings of lungs observed in rats at 7th day after dosing with bleomycin were proliferation of the type II alveolar epithelial cells and fibroblasts, increased invading of macrophages into lesions, round cell infiltration and perivascular edema. 4. Lung fibrous tissues were markedly increased in rats observed at 14th day after dosing with bleomycin. 5. Pumonary lesions observed in rats dosed with bleomycin and antioxidants(vitamin E, selenium, coenzyme $Q_{10}$) were not significantly different from those of rats given bleomycin alone.

• 생명과학회지
• /
• 제17권4호
• /
• pp.529-534
• /
• 2007

계란 섭취 수준이 흰쥐의 지질대사 및 혈청의 단백질, 무기질, 혈당 농도 및 효소활성에 미치는 영향을 조사하고자, 성숙한 숫쥐를 대조식이군, 대조식이에 계란 분말을 5, 10 및 15%씩 혼합한 식이군(5, 10 및 15% 계란군)등 4군으로 나누어 4주간 사육한 결과는 다음과 같다. 실험동물의 체중증가량은 대조군에 비해 계란군들이 유의성 있는 차이는 나타나지 않았다. 간의 무게 및 간조직의 콜레스테롤과 중성지질 함량은 대조군에 비해 5, 10 및 15% 계란군들이 유의하게 증가되었다. 신장과 부고환 지방의 무게는 대조군과 계란군들이 비슷하였다. 혈청의 중성지질, 총 콜레스테롤, HDL-콜레스테롤 및 LDL+VLDL-콜레스테롤 농도는 대조군에 비해 각 수준별 계란군이 유의성 있는 차이는 나타나지 않았다. 총 콜레스테롤에 대한 HDL-콜레스테롤의 비율은 5% 계란군이 15% 계란군 보다 유의하게 증가되었고, 동맥경화지수는 5% 계란군이 10 및 15% 계란군 보다 유의하게 낮추는 것으로 나타났다. 혈청의 총 단백질과 알부민 농도는 대조군에 비해 및 10 및 15% 계란군이 유의하게 증가되었다. 혈청의 요소질소, 크레아티닌, 혈당, 혈색소 농도 및 효소활성은 계란섭취에 의한 영향은 나타나지 않았다. 혈청의 칼슘 농도는 대조군에 비해 계란 섭취군들이 유의하게 증가되었다.

• 한국식품영양과학회지
• /
• 제33권5호
• /
• pp.821-826
• /
• 2004

신령버섯이 고지방식이를 섭취한 흰쥐의 지질대사에 미치는 영향을 조사하고자, 생후 21주링의 音쥐 에 표준식이를 급여한 정상군, 표준식이에 20% 돈지를 첨가한 식이를 급여한 고지방군, 고지방 식이에 신령버섯 자실체 분말을 3% 및 5%씩 첨가한 식이를 급여한 군(3% 및 5% 신령 버섯군) 등 4군으로 나누어 10주간 사육한 결과는 다음과 같다. 실험동물의 체중증가량 및 식이효율은 고지방군에 비해 3% 신령버섯군이 다소 감소되었으나, 5% 신령버섯군은 유의하게 감소되었다. 간과 신장의 무게는 고지방군과 신령버섯군들이 비슷하였으나, 부고환지방은 고지방군에 비해 신령버섯군들이 유의하게 감소되었다. 간의 콜레스데롤 농도는 고지방군과 신령버섯군들이 비슷한 수준으로 감소효과가 나타나지 않았다. 혈청 및 간의 중성지질 농도는 고지방군에 비해 5% 신령버섯군이 유의하게 감소되었다. 혈청의 총 콜레스테롤과 LDL-콜레스테롤 농도 및 동맥경화지수는 고지방군에 비해 3% 및 5% 신령버섯군이 유의하게 감소되었다. 총 콜레스테롤에 대한 HDL-콜레스테롤의 비율은 고지방군에 비해 신령버섯군들이 유의하게 증가되었다. HDL-콜레스테롤 및 인지질 농도는 고지방군과 신령버섯군들이 비슷한 수준으로 신령버섯 섭취에 따른 영향은 나타나지 않았다. 이상의 결과로 보아 고지방식이를 급여한 흰쥐에 신령버섯을 5% 급여시 혈청과 간의 중성지질 농도, 혈청의 총 콜레스테롤, LDL-콜레스테롤 농도 및 동백경화지수를 낮추고, 총 콜레스테롤에 대한 HDL-콜레스테롤의 비율을 증가시키는 것으로 나타났다.

• Toxicological Research
• /
• 제13권1_2호
• /
• pp.23-27
• /
• 1997

This study was performed to examine the anti-cancer effect of Red Ginseng in the DENGalN-PH-induced hepatic tumor model system in rats. One hundred of male SPF Sprague-Dawley rats(6weeks old) were randomly divided into five groups. Rats in groups 1, 2, 3, and 4 were administered to diethylnitrosamine intraperitoneally 200 mg/kg body weight for the caner initiation. Rats in group 5 were given to saline as a control. On two weeks after cancer initiation, rats in groups 1 and 3 were fed on diet containing 0.01% of acethylaminofiuorene(AAF) which is strong cancer-promotor for 6 weeks, while rats in groups 2 and 4 were fed on water containing 0.05% of phenobarbital which is weak cancer.promotor for 6 weeks. Rats in groups 1 and 2 were treated with diet containing 3% of Red Ginseng for six weeks(from 9th week till 15th week after cancer initiation). Rats in all groups were necropsied time-sequencially at 8, 15, and 36 weeks. The hepatic lesions of rat treated with carcinogens expressed glutathione S-transferase placental form(GST-P) at 8 week. The GST-P positive foci of rats treated with AAF were larger than that of any other rats, while the GST-P positive foci of rats treated with AAF and red ginseng were significantly decreased. This anti-cancer effect of Red ginseng might be involved in the enhacement of natural killer cell activity. To know whether there is direct relationship between Red Ginseng and natural killer cell activity, the activity of natural killer cell was examined after treatment AAF, AAF+Red ginseng and Red ginseng only, respectively. Comparing with natural killer cell activity in AAF-treated group, natural killer cell activity was significantly activated in AAF+ Red ginseng-treated group. This indicated that Red ginseng might enhance natural killer activity after treatment carcinogen in rats. These results suggested that Red ginseng might have a cancer prevention ability by promoting natural killer cell activity during hepatocarclnogenesis.