• Title, Summary, Keyword: Mongolian gerbil

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Bombesin Immunorectivtiy in Suprachiasmatic Nucleus in Rat and Mongolian Gerbil after Colchicine Treatment (Colchicine 투여 후 흰쥐와 모래쥐 시각교차위핵내 bombesin에 대한 면역조직화반응)

  • Kim Jin-Sang;Yi Seong-Joon
    • The Journal of Korean Physical Therapy
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    • v.11 no.2
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    • pp.115-122
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    • 1999
  • This experiment was carried out to investigate the bombesin immunoreactivity in suprachiasmatic nucleus in rat and Mongolian gerbil hypothalamus after colchicine treatment and analyze the morphological difference between rat and Mongolian gerbil which is focused for experimental animal model of neuronal and circulatory diseases. The results were as followings. 1. The shape of suprachiasmatic nucleus was triangle in rat, but oval or kidney-shape in Mongolian gerbil 2. The suprachiasmatic nucleus devided into ventrolateral portion and dorsomedial portion in rat, but dorsolateral portion and ventromedial portion or superior portion and inferior portion in Mongolian gerbil. 3. The area of suprachiasmatic nucleus of rat was greater than one of Mongolian gerbil. 4. The bombesin immunoreactivity showed after colcichine treatment in rat and Mogolian gerbil suprachiasmatic nucleus. 5. The bombesin immunoreactivity was stronger in ventrolateral portion than in dorsomedial portion of suprachiasmatic nucleus in rat, but in ventromedial or inferior portion than in dorsolateral or superior portion of suprachiasmatic nucleus in Mongolian gerbil. 6. The bombesin immunoreactivity showed at the oval, ellipsoid or triangular neurons and varicose nerve terminals in ventrorateral portion of rat, and only nerve terminals in dorsomedial portion of rat suprachiasmatic nucleus. But the bombesin immunoreativity didn't show at neurons of Mongolian gerbil suprachiasmatic nucleus.

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Comparison of the distribution pattern of the bombesin-immunoreactive neurons in the hypothalamic nucleus of the Mongolian gerbil and rat (Mongolian gerbil과 랫드 시상하부핵에서 bombesin 면역반응세포의 분포양상 비교)

  • Yi, Seong-joon;Kim, Jin-sang
    • Korean Journal of Veterinary Research
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    • v.39 no.6
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    • pp.1033-1037
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    • 1999
  • This study was carried out to compare the distribution pattern of the bombesin immunoreactive neurons of the hypothalamic nucleus in the rat and Mongolian gerbil. The bombesin immunoreactive neurons in the rat were located in the dorsal part of the dorsomedial hypothalamic nucleus, but in the Mongolian gerbil in the compact part of dorsomedial hypothalamic nucleus. From this results, we could get an evidence that there were some differences in the distribution of peptide between rat and Mongolian gerbil.

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The change of dopaminergic immunoreactive cells in telencephalon and diencephalon of mongolian gerbil by water deprivation (절수에 의한 mongolian gerbil 종뇌 및 간뇌에서 dopamine성 면역반응세포의 분포변화)

  • Song, Chi-won;Lee, Kyoung-youl;Park, Il-kwon;Jung, Ju-young;Kwon, Hyo-jung;Lee, Chul-ho;Hyun, Byung-hwa;Lee, Geun-jwa;Song, Woon-jae;Jung, Young-gil;Lee, Kang-iee;Kim, Moo-kang
    • Korean Journal of Veterinary Research
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    • v.40 no.1
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    • pp.1-16
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    • 2000
  • Nowadays, mongolian gerbil is notably utilized for the research of brain and water deprivation because of a congenital incomplete willis circle structure in the brain, audiogenic seizure in low noise, and special cholesterol metabolism without water absorption for a long time. In this study, we are intend to identify the morphological changes of the catecholaminergic neuron of brain according to the time lapse in the condition of long term water deprivation. 55 mongolian gerbil were divided 10 groups(control, 1, 2, 3, 4, 5, 10, 15, 20, 42th day water deprivation group), of which each group include 5 mongolian gerbils and 5 normal mongolian gerbils in control group were also used for brain atlas as a control. The brains were observed by the immunohistochemical stain using the TH, DBH and PMNT antibody. The results were as followings; 1. The nerve fibers of the TH-immunoreactive neuron were observed only in the and corpus striatum of the telencephalon. 2. Intensity of the immunostain of the nerve fiber in the cerebral cortex and corpus striatum was decreased gradually day by day after water deprivation. 3. The TH-immunoreactive nerve cells were observed in the paraventricular and periventricular nucleus of the 3rd ventricular in the hypothalamus of mongolian gerbil but the number of nerve cells were decreased from the first day of the water deprivation to the 10th day and increased until the 20th day, after than redecreased from the 20th day by the continuous water deprivation. The number of nerve fibers in this area were increased in the first day, but decreased from the 2nd day of water deprivation. The shape and density of the dopamine secreting cells in the brain of mongolian gerbil by the immunoreactive stain were changed in the continuous water deprivation. In this results, we can conclude that dopamine concerned in the water metabolism of mongolian gerbil, and mongolian gerbil could be used as an animal model for the research of water deprivation.

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Water-Immersion-Restraint Stress model in Mongolian gerbil forcomparison of pathoaenicity of Helicobacter pylori strains (Helicobacter pylori의 병원성 비교를 위한 gerbil의 수침구속스트레스 모델)

  • Lee, Jin-Uk;Kim, Ok-jiu
    • Korean Journal of Veterinary Research
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    • v.44 no.4
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    • pp.607-613
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    • 2004
  • Helicobacter pylori (H. pylori)-infection is an important pathogen of stomach cancer after chronic gastritis and ulceration in the stomach and duodenum. However, the virulences of H. pylori strains have not been well-defined between clinical isolates. This study was designed to establish water-immersion-restraint stress (WIRS) model in mongolian gerbil for comparison of pathogenicity of H. pylori strains. To determine an optimal duration time for WIRS model in gerbil, 5-week-old Mongolian gerbils were divided into different groups by WIRS duration time. After graded duration of WIRS, the macroscopic ulcer index (UI) was measured with the stomach and duodenum of sacrificed animal. There were no significant differences between male and female in same duration group. However, the UI increased significantly in a time-dependent fashion. The group of 6 hours-WIRS animals showed severe hemorrhage and ulceration in their stomach and duodenum. On the other hand, the very mild lesions induced in 2 hours-treated animals. Therefore, we determined an optimal duration time for WIRS model in gerbil as 4 hours. Thereafter, we evaluated whether this WIRS model in gerbil could be used as an useful tool for in vivo comparison of pathogenicity of H. pylori strains by enhancement of pathological severity in H. pylori-infected gerbils. Mongolian gerbils were divided into H. pyloriinfected and PBS-inoculated groups. Thereafter, they were divided again into 4 hours-WIRS and no WIRS subgroups. After treatment, the severity of pathological changes was evaluated in a same manner with previous duration-determining experiment. When the animals were exposed to WIRS, the UI was significantly higher in the infected group than in the uninfected group. These results suggested that the established gerbil-WIRS model in this study enhanced effectively the severity of pathogenic changes in the H. pylori-infected Mongolian gerbils and could be used as an useful tool for in vivo comparison of pathogenicity of H. pylori strains.

Postnatal development of Harderian gland in Mongolian gerbil (몽고리안 저빌의 Harderian gland의 출생후 형태학적 변화)

  • Oh, Seung-hyun;Park, Ji-young;Yoon, Yeo-sung;Kim, Dae-joong;Nam, Sang-yoon;Lee, Joon-sup;Seong, Je-kyung
    • Korean Journal of Veterinary Research
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    • v.39 no.1
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    • pp.1-11
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    • 1999
  • This investigation was carried out to study morphological and chronological aspects of the development of the Harderian gland in the Mongolian gerbil(Meriones unguiculatus). Male and female Mongolian gerbils were sacrificed on days 1, 3, 5, 10, 30 and 60 after birth and their Harderian glands were processed for light microscopic observation. The results obtained were summarized as follows; 1. In 1-day-old Mongolian gerbil, Harderian gland was well distinguished from other tissue structures. It was composed of several immature tubules, and these tubules were separated each other by undifferentiated mesenchymal connective tissues. 2. In 3-day and 5-day-old Mongolian gerbils, the arrangement of tubules in the gland was more condensed than that of 1-day-old Mongolian gerbil. The excretory ducts started to appear in the connective tissues located between lobes. 3. In 10-day-old Mongolian gerbil, small lipid vacuoles began to be found in the cytoplasm of the secretory cells of the Harderian gland. There were some mucus-secreting cells within the epithelium of the excretory duct found in the interlobar connective tissues. 4. In 30-day-old Mongolian gerbil, there was markedly increased number of the tubules in the glands. The epithelial cells of the tubules were typically columnar in shape. Most of the columnar epithelial cells contained many small lipid vacuoles, although a few cells contained large lipid vacuoles. 5. In 60-day-old Mongolian gerbil, the Harderian gland exhibited the typical structural characteristics of the adult gland. The mature glandular structures were more distinct than those of 30-day-old animals.

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The Study on the Ultrastructure and Distribution of Dopaminergic Cells in the Brain of Mongolian Gerbil after Water Deprivation (절수에 의한 Mongolain gerbil 뇌 Dopamine성 면역반응세포의 분포와 미세구조의 변화에 관한 연구)

  • Song, Chi-Won;Lee, Kyoung-Youl;Park, Il-Kwon;Kwon, Hyo-Jung;Kim, Moo-Kang;Lee, Kang-Lee
    • Applied Microscopy
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    • v.30 no.2
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    • pp.193-204
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    • 2000
  • Nowadays, mongolian gerbil is widely utilized in the research of brain and water deprivation because of congenitally incomplete Willis' circle, audiogenic seizure in low noise, and special cholesterol metabolism without water absorption for a long time. In this study, we intended to identify the time lapse changes in the general morphoogy and ultrastructure of the catecholaminergic neurons of mongolian gerbil brain in after long-term water deprivation. Fifteen mongolian gerbils were divided into 3 groups (5, 10, and 20-day water deprivation groups), each with 5 mongolian gerbils. Additional 5 mongolian gerbils which received water without limitation were used as a control. The brain sections were immunostained using tyrosine hysroxylase (TH), $ dopamine-\beta-hydroxylase$ (DBH), and phenylethanolamine-N-methyltrasferase (PMNT) antibodies. And immunoreactive cells were observed by electromicroscopy for the ultrastructural changes . The TH-immunoreactive (TH-IR) nerve cells were observed in the para- and peri-ventricular nucleus of the 3 rd ventricle in the hypothalamus and the substantia nigra. The number of TH-IR neurons in these areas was decreased from the 5th day of the water deprivation to the 10 th day and reincreased until 20 th day water deprivation. The shape and density of the dopamine-secreting cells identified by immunohistochemistry showed changes in the continuous water deprivation. Electron microscopy revealed a round nucleus in the neurons of control group but 5-day water deprivation group showed a dense and irregularly shaped nucleus. Also in the 5-day water-deprived group, mitochondria was decreased in number and junctins were disappered. Endoplasmic reticulum, Golgi complex did not show changes after water-deprivation. In this results, we can conclude that dopamine are involved in the water metabolism in mongolian gerbil, and mongolian gerbil could be used as an animal model for the researches of water deprivation.

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Comparative study on Hsp25 expression in Mongolian gerbil and mouse cerebellum

  • Lee, Heang-Yeon;Kim, Seong-Hwan;Lee, Jae-Bong;Shin, Chang-Ho
    • Korean Journal of Veterinary Service
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    • v.29 no.4
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    • pp.469-482
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    • 2006
  • The term 'heat shock protein (Hsps)' was derived from the fact that these proteins were initially discovered to be induced by hyperthermic conditions. In response to a range of stressful stimuli, including hyperthermia, immobilization, UV radiation, amino acid analogues, arsenite, various chemicals, and drugs the mammalian brain demonstrates a rapid and intense induction of the heat shock protein. Moreover, Hsps were expressed on the various pathological conditions including trauma, focal or global ischemia, hypoxia, infarction, infections, starvation, and anoxia. Especially, Hsp25 has a protective activity, facilitated by the ability of the protein to decrease the intracellular levels of reactive oxygen species (ROS) as well as its chaperone activity, which favors the degradation of oxidized proteins. Recently, it has clearly demonstrated that Hsp25 is constitutively expressed in the adult mouse cerebellum by parasagittal bands of purkinje cells in three distinct regions, the central zone (lobule VI-VII) and nodular zone (lobule IX-X), and paraflocculus. The Mongolian gerbil has been introduced into stroke study model because of its unique brain vasculature. There are no significant connections between the basilarvertebral system and the carotid system. This anatomy feature renders the mongolian gerbil susceptible to forebrain ischemia-induced seizure. The present study is designed to examine the pattern of Hsp25 expression in the cerebellum of this animal in comparison with that in mouse.

Mongolian Gerbil as a Novel Animal Model for Ligature-induced Periodontitis

  • Jang, Sungil;Bak, Eun-Jung
    • International Journal of Oral Biology
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    • v.41 no.4
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    • pp.225-230
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    • 2016
  • Inflammation from chronic and acute infections of distal organs and tissues such as periodontitis is a risk factor for atherosclerotic vascular processes. Recently, a new model of atherosclerosis with vascular pathologies was developed in the Mongolian gerbil. In this study, we attempted to develop a model of ligature-induced periodontitis in gerbils and compared the characteristics of that periodontitis model with that in rats and mice. Each gerbil, rat, and mouse was randomly assigned to groups of control and periodontitis. A thread was placed around the cervix of the right and left first molars in the mandible with knots placed on the mesial side of each molar. At day 14 after the ligation, the animals were sacrificed and their mandibles were dissected. To measure alveolar bone loss along with inflammation, histopathological and micro-CT analyses were carried out. Gerbils showed tooth characteristics of deeper gingival crevice, longer cusp, longer root trunk and shorter root than those of rats and mice. The increased CEJ-ABC distance in distal and PDL area in furcation was also observed in ligated gerbils. An inflammatory response in the connective tissue under the junctional epithelium was also shown in all the animals. As a result, we confirmed the induction of periodontitis by ligature in the gerbils. We therefore consider the gerbil to be a useful model for investigating relationship between periodontitis and vascular disease in the same animal.

Persistent infection with Strongyloides venezuelensis in the Mongolian gerbil (Meriones unguiculatus)

  • Baek, Byeong-Kirl;Whang, In-Soo;Islam, M.-Khyrul;Kim, Byeong-Soo;Kakoma, Ibulaimu
    • The Korean Journal of Parasitology
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    • v.40 no.4
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    • pp.181-186
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    • 2002
  • To examine the fate of Strongyloides venezuelensis, Mongolian gerbils (Meriones unguicalatus) were orally infected with 1,000 $L_{3}$ larvae per animal. Altogether, 50 gerbils divided into 5 groups of 10 each were monitored for a period of 570 days to document the kinetics of faecal egg output, adults worm population, morphological development, fecundity, and hematological changes including peripheral blood eosinophilia. This study chronicled a life long parasitism of S. venezuelensis in the gerbil host, and showed that S. venezuelensis infection was quite stable throughout the course of infection and the worms maintained their normal development as evidenced by their body dimension. A progressive loss of body condition of the infected gerbils was observed as the level of infection advanced. However, no detectable pathological changes were observed in the gastrointestinal tract. The present findings indicate that an immunocompetent host, such as the Mongolian gerbil, can serve as a life long carrier model of S. venezuelensis if the worms are not expelled within 570 days after infection.

Upregulation of aquaporin 2 and aquaporin 4 in the water-deprived mongolian gerbil (Meriones unguiculatus) kidney (절수시 Mongolian gerbil (Meriones unguiculatus) 콩팥의 Aquaporin 2, Aquaporin 4 발현변화)

  • Song, Ji-Hyun;Kwon, Jin-Seuk;Kim, Yong-Hwan;Park, Yong-Deok;Han, Ki-Hwan;Ryu, Si-Yun;Jung, Ju-Young
    • Korean Journal of Veterinary Research
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    • v.47 no.4
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    • pp.363-370
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    • 2007
  • Mongolian gerbil (Meriones unguiculatus) has been as an model animal for studing the neurological disease such as stroke and epilepsy because of the congenital incompleteries in Willis circle, as well as the investigation of water metabolism because of the long time-survival in the condition of water-deprived desert condition, compared with other species animal. Aquaporin 2 (AQP2) expressed at the surface of principal cells in collecting duct results from an equilibrium between the AQP2 in intracellular vesicles and the AQP2 on the plasma membrane. Aquaporin 4 (AQP4), which is expressed in cell in a wide range of organ, is also present in the collecting duct principal cells where this is abundant in the basolateral plasma membranes and represent potential exit pathways from the cell for water entering via AQP2. In this research, we divide 3 groups of which each group include the 5 animals. In the study of 7 or 14 days water restricted condition, we investigated the AQP2 and AQP4 by using a quantitative immunohistochemistry in the kidney. The results obtained in this study were summarized as followings. AQP2 is abundant in the apical plasma membrane and apical vesicles in the collecting duct principal cell and at rare abundance in connecting tubules. In the water-deprived Mongolian gerbil kidney, expression of AQP2 was continuosly increased in the cortical collecting duct and inner medullary collecting duct. This increase was both the apical region and cytoplasm. AQP4 is mainly expressed in the inner medulla, although some expression is also noted in the more proximal segment. In the water-deprived Mongolian gerbil kidney, AQP4 was also increased in the inner medullary collecting duct. Immunoactivity was increased in entire inner medullary collecting duct and newly detected in cytoplasm of principal cell. These findings suggest that increased levels of AQP2 and AQP4 in the cortical and inner medulalry collecting duct may play a important role for maintain fluid balance in the water-deprived kidney.