Amount of lead burden in a tissue reflects poisoning of lead in that tissue, so is the removal of lead directly connected to curement of lead poisoning. The purpose of present study was to investigate the relative effects of penicillamine and thiamine tetrahydrofurfuryl disulfide (TTFD) or thiamine propyl disulfide (TPD) in the removal of lead from rat brain tissue treated with excessive lead. Wistar rat pups of both sexes were used in this experiment. Within 1 day of parturition, experimental mothers nursing their pups as well as rat pups were given drinking water containing 0.2% lead acetate, TTFD 20mg/1.2 L (2 mg/kg/day), TPD 20 mg/1.2 L (2mg/kg/day), penicillamine 40 mg/1.2 L (40 mg/kg/day), 0.2% lead acetate+TTFD 20mg/1.2 L (2 mg/kg/day), 0.2% lead acetate+ TPD 20 mg/1.2 L (2 mg/kg/day) or 0.2% lead acetate+ penicillamine 40 mg/1.2 L (40 mg/kg/day) ad libitum, throughout the entire period of experiment. Rat pups in the control group received normal tap water. The animals were sacrificed by decapitation on the day when they become 2 or 8 weeks of age. Brains were dissected into five regions: telencephalon, diencephalon, midbrain, pons/medulla and cerebellum. The dissected brain tissues were lyophillized and then solubilized by acid mixture (nitric acid + sulfuric acid). Lead levels in the solubilized brain tissues were measured by the inductively coupled plasma. In lead-exposed rats, lead levels were significantly higher than those of control group in all brain legions, lead levels in brain regions of TTFD or TPD group were generally lower than those of control group. The simultaneous administration of lead with TTFD or TPD to animals caused significant decrement of lead from all brain regions. In the elimination of lead from brain regions, effectiveness of TTFD or TPD was equivalant to penicillamine.
To observe the healing process of the gingival wound in diabetic condition, the author induced diabetes mellitus by intravascular injection of streptozotocin in rat tail vein and made fresh wound in rat mandibular posterior gingiva using scalpel. The healing processes of gingival wound were examined periodically by light microscopy. The results were as follows. 1) The healing was completed at second week in control group, but it delayed until fourth week in experimental group and the organization was persisted for first two weeks. 2) The inflamed gingiva of dibetic rat demonstrated scanty polymorphonuclear lerkocytic infiltration at the early stage of experiment, but it soon became numerous as in cotrol group and the lymphocytic infiltrations were same degree as in control group. 3) The tissue destruction was broader in the experimental group than in the control group. The epithelization was began at the early stage of healing and the epithelial attachment was reformed with the completion of the wound healing. 4) Loss of Sharpey's fibers and destruction of cementum and alveolar bone were observed with the inflammatroy reaction, but these were reformed with the completion of the wound healing.
This experiment was examined the effect of splenectomy on the hematology in pregnant wistar rat. Only animals that had been shown regular 4-day estrous cycles for more than two cycles were used. The day after mating with the same male animal ws designated Day 0 of pregnancy. Spleen was removed from Day 0(early), 6(middle) and 13(late) of pregnant rat, respectively. Blood sample was collected at Day 1, 7, 14 and 21 of the pregnancy. 1. RBC was increased significantly(P<0.05) to the progress of pregnancy in control rat. The late splenectomized rats were decreased significantly(P<0.05) at Day 21 of pregnancy than control rats. 2. Hb was increased significantly (P<0.05) at 21th day of pregnancy in late splenectomized groups than others group. 3. In the late splenectomized rats, Ht was decreased significant (P<0.05) due to the progress of pregnancy and decreased significantly (P<0.05) at Day 21 of pregnancy in all splenectomized groups. 4. WBC was increased significantly (P<0.05) at Day 1 of pregnancy in splenectomized groups compared with control. 5. In differential leukocyte rate, the Basophils and Monocytes was not significantly changed. Neutrophils was increased significantly(P<0.05) at Day 14 and 21 than Day 1 and 7 of pregnancy in control. Lymphocytes was decreased significantly(P<0.05) in control due to progress of pregnancy. Neutrophils was increased and Lymphocytes was decreased significantly(P<0.05) in splenectomized groups compared with control.
Journal of the Korean Society of Food Science and Nutrition
/
v.29
no.5
/
pp.865-869
/
2000
This experiment was carried out to investigate the effects of dietary mulberry leaf power on gastrointestinal function of rats. Plot containing one and ten percent mulberry leaf powder was supplied with rats. The food efficiency ratio (FER) of rat fed with 10% mulberry leaf powder was decreased 14%. the transit time of rat fed with 1% and 10% mulberry leaf was faster 16% and 21% than that of control respectively. Intestine length was increased 10% and 11% at 1% and 10% dietary mulberry leaf respectively. The transit speed was faster 30% at 1% dieatry mulberry leaf than that of control. The pH of rat's feces supplied with mulberry leaf was lower than that of control. The amount of daily rat's feces fed mulberry leaf was much than that of control. As above results, we suggest that mulberry leaf was evaluated to improve the function of rat's gastrointestine.
The epithelial cell adhesion molecule (EpCAM) is a pan-epithelial differentiation antigen that is expressed on almost all carcinomas. However, a role in rat liver carcinogenesis has never been reported previously. Thus, its expression was investigated herein in rat liver tumors induced by diethylnitrosamine (DEN). Twenty male 5-week-old F344 rats were used in this experiment. Mini-osmotic pumps containing doses of 47.5 mg of DEN were inserted into the abdominal cavity of each animal to initiate liver carcinogenesis. All animals were sacrificed at 26 weeks after DEN treatment. At necropsy, hepatic masses were processed for histopathological examination, which revealed forty-four hepatocellular adenomas (HCAs) and twenty hepatocellular carcinomas (HCC). Tumors were immunohistochemically analyzed for EpCAM, proliferating cell nuclear antigen (PCNA) and co-localization of the two. EpCAM expression was mainly detected in hepatic tumor cells, showing a cytoplasmic staining pattern. However, expression was also slightly observed in normally-appearing surrounding hepatic cells. PCNA expression was highly detected in tumor cells, showing nuclear staining. Double staining of EpCAM and PCNA in tumors showed many cells with co-localization. Taken together, EpCAM and PCNA expression were increased in DEN-induced tumors and many tumor cells showed co-expression. It is suggested that EpCAM may increase during DEN-induced tumors, possibly associated with cell proliferation.
The purpose of this experiment was to investigate the effects of adrenalectomy and PMSG treatment on reproductive organs and serum steroid hormone level in immature female rats. The animals used in this experiment were 25 days old female rats weighing a, pp.oximately 70g. They were randomly divided into two groups of intact rat group (Int-) and adrenalectomized rat group (Adx-) and each group were subdivided into two groups of Non-PMSG (-Cont) and PMSG treated (-PMSG) group. The rat of PMSG-treated group (-PMSG) was administered subcutaneously with 25 IU PMSG on first day (9 a.m.) after adrenalectomy. The adrenalectomized rat groups were su, pp.ied with saline solution through the experiment period. The rate of ovulation and vaginal opening and reproductive organ weights were observed at 8, 32, 56, 80 and 104 hours after PMSG treatment. At the same time, the serum level of estradiol-17${\beta}$ and progesterone were measured by the radioimmunoassay. The results obtained were as follows: 1. Ovulation was shown at 56 hours after treatment in Int-PMSG group and Adx-PMSG group and Adx-PMSG group. The rate of ovulation was very low in PMSG-treated groups, but it was increased in 80 to 90% at 104 hours after treatment. However, there was no ovulation in Int-Cont group and Adx-Cont group. 2. Vaginal opening was shown at 56 hours after treatment in Int-PMSG group and Adx-PMSG group and a, pp.ared in 80% at 104 hours after treatment. The rate of vaginal opening in PMSG-treated groups was very low, but Int-Cont group and Adx-Cont group had no vaginal opening. 3. The weight of ovary and uterus in two PMSG-treated groups were increased with the elapse of time after treatment and were significantly heavy in all observation time, but changes in Int-Cont group and Adx-Cont group were not recognized. The weights of ovaries and utera in Adx-Cont group were increased with the elapse of time. 4. The level of serum estradiol-17${\beta}$ was remarkably increased in PMSG-treated groups (Int-PMSG and Adx-PMSG groups) compared with Int-Cont and Adx-Cont group, and significant difference was recognized between Non-PMSG group and PMSG-treated group in the experimental period. Especially, the highest levels of Int-PMSG groups and Adx-PMSG groups were shown at 80 and 56 hours after treatment and after ward estradiol-17${\beta}$ levels of PMSG-treated groups were decreased. However, changes of the levels did not a, pp.ared in Non-PMSG groups at 104 hours after treatment. 5. The level of serum progesterone in PMSG-treated groups was significantly increased between 80 and 104 hours after treatment. With the elapse of time, the level was increased in all observed groups except for Int-Cont and Adx-Conx group. And the order from the highest level at 104 hours after treatment was Int-PMSG, Adx-PMSG, Int-Cont and Adx-Cont group.
Kim, Ki-Jeong;Seo, Jin-Hee;Sung, Yun-Hee;Kim, Bo-Kyun;Kim, Dae-Young;Lee, Sang-Hak;Kim, Chang-Ju;Kim, Young-Pyo
Korean Journal of Exercise Nutrition
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v.13
no.3
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pp.203-209
/
2009
Periventricular leukomalacia (PVL) is a common white matter lesion affecting the neonatal brains. PVL is closely associated with cerebral palsy (CP). It has been suggested that maternal or placental infection can induce damage to the neonatal brains. In the present study, we investigated the effects of treadmill running and swimming of rat pups on the GFAP and MBP expressions in the brains of rat pups with maternal lipopolysaccharide (LPS)-induced CP. The rats were divided into the six groups for experiment 1: the control group, the control with mild exercise group, the control with moderate exercise group, the LPS-treated group, the LPS-treated with mild exercise group, and the LPS-treated with moderate exercise group (n=6 in each group). The rats in the running groups were forced to run on a motorized treadmill for 30 min 5 times a week for 4 weeks. For experiment 2, the rats were divided into four groups: the control group, the LPS-treated group, the LPS-treated with swimming group, and the LPS-treated with treadmill running group (n = 5 in each group). The rats in the swimming group were made to swim for 30 min once a day for 5 times per week during 2 weeks. The rats in the treadmill running group were made to run for 30 min once a day for 5 times per week during 2 weeks. The present results showed that intracervical maternal LPS injection during pregnancy significantly increased GFAP expression in the striatum and significantly decreased MBP expression in the corpus callosum of rat pups. The present results also showed that treadmill running and swimming significantly suppressed GFAP expression and significantly enhanced MBP expression in the brains of rat pups with maternal LPS-induced CP. This effect of treadmill running was shown as equally both in the mild-intensity exercise and in the moderate-intensity exercise. The present study revealed that exercise, both the treadmill running and swimming, is effective for the treatment of astrogliosis and hypomyelination associated with CP. Here in this study, we showed that treadmill running and swimming are effective for alleviating the detrimental effects of CP.
Objectives : An aim of study is to investigate effects of curculiginis rhizoma in vitro (factor Xa (FXa) inhibitor assay, prothrombinase assay, prothrombin time (PT) assay, activated partial thromboplastin time (aPTT) assay) and in vivo experiment (blood clotting time, thromboxane B2 content assay in serum and weight of thrombus by AV-shunt rat model). Methods : We gained a human serum and used serum in vitro study such as factor X activity (FXa) inhibition, prothrombinase inhibition, prothrombin time (PT) and activated partial thromboplastin time. Fifteen SD rats were divided into three groups (intact control group and two experimental group treated with extract of Curculiginis Rhizoma(ECR)). Rats were orally administrated DW (intact control group), 600 mg/kg concertration of ECR and 200 mg/kg concertration of ECR. After one hour, we anesthetized rats and made arteriovenous (AV) shunt rat models to study weights of thrombus, took a hole blood to study content of thromboxane B2 and blood clotting time. Results : In vitro, ECR increased a inhibitory activity of FXa, prothrombinase and aPTT compared than intact control group. Especially ECR made significant increase of FXa and prothrombinase inhibitory activity (p<0.05, p<0.01). And PT were increased in ECR control group compared with intact control group. In vivo, a blood clotting time of experiment group treated with ECR 600 mg/kg were significantly increased compared with that of intact control group (p<0.05) and content of thromboxane B2 was significantly decreased in group treated with ECR 600 mg/kg in seum. The weight of thrombus were significantly reduced in group treated with ECR 600 mg/kg compared with intact control group (p<0.05). But in vivo experiment study, those of group treated with ECR 200 mg/kg were reduced compared with those of intact control group without statistical significance. Conclusions : ECR has a antithromboic activity in internal course with inhibitory activity of FXa and prothrombinase in vitro, it required to research more study for effective compounds.
In order to know the histological changes of rat preputial gland during normal sexual cycle and sex hormone treatment, matured Wistar rats (B.W.about 200g) were used for the experiment. Rats were subcutaneously given $2{\mu}g$ 17-${\beta}$-estradiol (Sigma) and 2.5g progesterone (Nakarai Chem., Japan) daily in 0.5ml propylen glycol for ten days respectively. The results obtained are as follow: At the stage of estrus and metestrus, the eosinophilic crystalloid granules and large vacuoles in the acinar cells appeared numerously, and the excretory ducts were severely extended. The developed connective tissue between the acinus were also found. At the stage of proestrus and diestrus, however, the small vacuoles and a few eosinophilic crystalloid granules appeared in the acinar cell. In the estradiol treatment, on the other hand, severely extended excretory ducts and a small number of the eosinophilic crystalloid granules compared with the progesterone treatment were found. The cyst-like structure was found, and in that the acinus disappeared completely. In the progesterone treatment, remarkably extended excretory ducts and nomerous appearance of oval formed eosinophilic granules in the acinar cells were found. As these findings, it could be suggested that the secretion of rat preputial gland was active at the estrus and metestrus stage, and estrogen may concerned in the secretion, land progesterone in the formation of secretory products.
Purpose: Platelet-rich plasma (PRP) is known to accelerate and/or enhance hard and soft tissue healing and regeneration. As such, PRP has been used in various clinical fields of surgery. Recently there have been several attempts to use PRP in the field of tissue engineering. However, some controversies still exist on exact mechanism and benefits of PRP. Therefore various animal experiments are necessary to reveal the effect of the PRP. However, even if animal experiment is performed, the efficacy of the experiment could not be validated due to absence of an animal PRP model. The purpose of this study is to establish rat PRP model by comparing several PRP fabricating methods, and to assay growth factor concentration in the PRP. Materials and methods: Rat blood samples were collected from nine SD rat (body weight: 600-800g). PRP was prepared using three different PRP fabricating methods according to previously reported literatures. (Method 1: 800 rpm, 15 minute, single centrifuge; Method 2: 1000 rpm, 10 minute, double centrifuge; Method 3: 3000 rpm, 4min and 2500 rpm, 8 min, double centrifuge). Platelet counts were evaluated in an automated machine before and after PRP fabrications. In terms of growth factor assay, prepared PRP were activated with 100 unit thrombin and 10% calcium chloride. Growth factor (PDGF-BB, VEGF) concentrations on incubation time were determined by sandwich-ELISA technique. Results: An average of 3ml (via infraorbital venous plexus) to 15ml (via celiac axis) the rat blood could be collected. By using Method 3 (3000 rpm, 4 min and 2500 rpm, 8 min, double centrifugation), around 1.5ml of PRP could be prepared. This method allowed us to concentrate platelet 3.77-fold on average. PDGF-BB concentration (mean, 1942.10 pg/ml after 1 hour incubation) and VEGF concentration (mean, 952.71 pg/ml after 1 hour incubation) in activated PRP were higher than those in untreated blood. Also PDGF-BB showed constant concentration during 4-hour incubation, while VEGF concentration was decreased after 1 hour. Conclusion: Total 11,000 g minute separation and condensation double centrifuge method can produce efficient platelet-rich plasma. Platelet-rich plasma activated with thrombin has showed higher concentrations of growth factors such as PDGF-BB and VEGF, compared to the control group. Platelet-rich plasma model in a rat model was confirmed in this study.
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