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Experimental Animals

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https://www.readbyqxmd.com/read/28993564/swine-used-in-the-medical-university-overview-of-20-years-of-experience
#1
Eiji Kobayashi, Yutaka Hanazono, Satoshi Kunita
Center for Development of Advanced Medical Technology (CDAMTec) in Jichi Medical University was established in FY 2009. It is the first educational research facility specialized for medical research and training using swine in Japan. Preclinical studies on large animals are essential prior to clinical trials to develop regenerative medical products and medical equipment. We have continued comprehensively considering using miniature swine for experiments to develop advanced medical technologies and train physicians with advanced clinical abilities, while paying attention to animal welfare...
October 7, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28855444/a-rat-model-for-studying-electroacupuncture-analgesia-on-acute-visceral-hyperalgesia
#2
De-Bo Qi, Si-Hui Zhang, Yu-Hua Zhang, Shu-Qin Wu, Wei-Min Li
The aim of this study was to establish an appropriate rat model to study the effect of electroacupuncture (EA) analgesia on acute visceral hyperalgesia. Adult rats received colorectal instillation with different concentrations of acetic acid (AA). Treatment with EA was performed for 30 min at bilateral acupoints of ST-36 and ST-37 in the hind limbs. The visceral sensation of all rats was quantified by scores of abdominal withdrawal reflex (AWR) and discharges of rectus abdominis electromyogram (EMG) in response to colorectal distension (CRD)...
August 30, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28845019/progranulin-haploinsufficiency-reduces-amyloid-beta-deposition-in-alzheimer-s-disease-model-mice
#3
Masato Hosokawa, Yoshinori Tanaka, Tetsuaki Arai, Hiromi Kondo, Haruhiko Akiyama, Masato Hasegawa
Granulin (Grn) mutations were identified in familial frontotemporal lobar degeneration (FTLD) patients with TDP-43 pathology. Grn transcript haploinsufficiency is proposed as a disease mechanism that leads to the loss of functional progranulin (PGRN) protein. Thus, these mutations are strongly involved in FTLD pathogenesis. Moreover, recent findings indicate that Grn mutations are associated with other neurodegenerative disorders with tau pathology, including Alzheimer's disease. To investigate the influence of PGRN on amyloid beta (Aβ) accumulation, amyloid precursor protein (APP) transgenic mice were interbred with Grn-deficient mice, producing APP transgenic mice harboring the Grn hemizygote (APP/Grn(+/-))...
August 25, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28845018/loss-of-angiotensin-converting-enzyme-ii-ace2-accelerates-the-development-of-liver-injury-induced-by-thioacetamide
#4
Hsi-Tien Wu, Ya-Wen Chuang, Cheng-Pu Huang, Ming-Huang Chang
Angiotensin converting enzyme II (ACE2), an angiotensin converting enzyme (ACE) homologue that displays antagonist effects on ACE/angiotensin II (Ang II) axis in renin-angiotensin system (RAS), could play a protective role against liver damages. The purpose of this study is to investigate whether inflammation-mediated liver injury could be affected by ACE2 derived pathways in the RAS. Eight-weeks-old wild-type (WT; C57BL/6) and Ace2 KO (hemizygous Ace2(-/y)) male mice were used to induce liver fibrosis by thioacetamide (TAA) administration (0, 100, and 200 mg/kg BW)...
August 25, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28824049/larger-cages-with-housing-unit-environment-enrichment-improve-the-welfare-of-marmosets
#5
Takuro Yoshimoto, Eiki Takahashi, Shunji Yamashita, Kiichi Ohara, Kimie Niimi
The provision of adequate space for laboratory animals is essential not only for good welfare but accurate studies. For example, housing conditions for primates used in biomedical research may negatively affect welfare and thus the reliability of findings. In common marmosets (Callithrix jacchus), an appropriate cage size enables a socially harmonious family environment and optimizes reproductive potential. In this study, we investigated the effects of cage size on body weight (BW), behavior, and nursing succession in the common marmoset...
August 18, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28757511/use-of-animal-models-for-the-imaging-and-quantification-of-angiogenesis
#6
Min Liu, Songbo Xie, Jun Zhou
Angiogenesis is the process of developing new blood vessels from the original vascular network; it is necessary for normal physiological processes, such as embryonic development and wound healing. Angiogenesis is also involved in pathological events, including myocardial ischemia and tumor growth. To investigate the molecular mechanisms of this important process, a variety of methods and models are employed. These strategies can also be used to provide insight into the etiology of angiogenesis-related diseases, thereby contributing to the development of new diagnostics and treatments...
July 31, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28757517/reproducible-insulin-secretion-from-isolated-rat-pancreas-preparations-using-an-organ-bath
#7
Asuka Morita, Motoshi Ouchi, Misao Terada, Hiroe Kon, Satoko Kishimoto, Keitaro Satoh, Naoyuki Otani, Keitaro Hayashi, Tomoe Fujita, Ken-Ichi Inoue, Naohiko Anzai
Diabetes mellitus is a lifestyle-related disease that is characterized by inappropriate or diminished insulin secretion. Ex vivo pharmacological studies of hypoglycemic agents are often conducted using perfused pancreatic preparations. Pancreas preparations for organ bath experiments do not require cannulation and are therefore less complex than isolated perfused pancreas preparations. However, previous research has generated almost no data on insulin secretion from pancreas preparations using organ bath preparations...
July 28, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28747592/investigation-of-spinal-nerve-ligation-mediated-functional-activation-of-the-rat-brain-using-manganese-enhanced-mri
#8
Keun-Yeong Jeong, Ji-Hyuk Kang
To provide clear information on the cerebral regions according to peripheral neuropathy, the functional activation was investigated using manganese-enhanced magnetic resonance imaging (MEMRI). L5-spinal nerve ligation (SNL) was applied to the rats to induce neuropathic pain. Mechanical allodynia and thermal hyperalgesia were measured to confirm neuropathic pain induction following before and after gabapentin (GBP) treatment. The cerebral regions were investigated using a 4.7T MRI system in the sham, SNL, and GBP-treated SNL rats...
July 26, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28450692/the-ethyl-acetate-fraction-of-a-methanolic-extract-of-unripe-noni-morinda-citrifolia-linn-fruit-exhibits-a-biphasic-effect-on-the-dopaminergic-system-in-mice
#9
Vijayapandi Pandy, Megala Narasingam, Kamini Vijeepallam, Syam Mohan, Vasudevan Mani, Zahurin Mohamed
In earlier ex vivo studies, we reported the biphasic effect of a methanolic extract of unripe Morinda citrifolia fruit (MMC) on dopamine-induced contractility in isolated rat vas deferens preparations. The present in vivo study was designed and undertaken to further explore our earlier ex vivo findings. This study examined the effect of the ethyl acetate fraction of a methanolic extract of unripe Morinda citrifolia Linn. fruit (EA-MMC; 5-100 mg/kg, p.o.) on the dopaminergic system using mouse models of apomorphine-induced climbing time and climbing behavior, methamphetamine-induced stereotypy (sniffing, biting, gnawing, and licking) and haloperidol-induced catalepsy using the bar test...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28442635/a-novel-missense-mutation-of-mip-causes-semi-dominant-cataracts-in-the-nat-mouse
#10
Gou Takahashi, Sayaka Hasegawa, Yukiko Fukutomi, Chihiro Harada, Masamune Furugori, Yuta Seki, Yoshiaki Kikkawa, Kenta Wada
Major intrinsic protein of lens fiber (MIP) is one of the proteins essential for maintaining lens transparency while also contributing to dominant cataracts in humans. The Nodai cataract (Nat) mice harbor a spontaneous mutation in Mip and develop early-onset nuclear cataracts. The Nat mutation is a c.631G>A mutation (Mip(Nat)), resulting in a glycine-to-arginine substitution (p.Gly211Arg) in the sixth transmembrane domain. The Mip(Nat/Nat) homozygotes exhibit congenital cataracts caused by the degeneration of lens fiber cells...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28413186/the-characterization-of-a-full-thickness-excision-open-foot-wound-model-in-n5-streptozotocin-stz-induced-type-2-diabetic-rats-that-mimics-diabetic-foot-ulcer-in-terms-of-reduced-blood-circulation-higher-c-reactive-protein-elevated-inflammation-and-reduced-cell
#11
Caroline Oi-Ling Yu, Kwok-Sui Leung, Kwok-Pui Fung, Francis Fu-Yuen Lam, Ethel Sau-Kuen Ng, Kit-Man Lau, Simon Kwoon-Ho Chow, Wing-Hoi Cheung
Delayed foot wound healing is a major complication attributed to hyperglycemia in type 2 diabetes mellitus (DM) patients, and these wounds may develop into foot ulcers. There are at least two types of DM wound models used in rodents to study delayed wound healing. However, clinically relevant animal models are not common. Most models use type 1 DM rodents or wounds created on the back rather than on the foot. An open full-thickness excision wound on the footpad of type 2 DM rats is more clinically relevant, but such a model has not yet been characterized systematically...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28381818/dronedarone-attenuates-the-duration-of-atrial-fibrillation-in-a-dog-model-of-sustained-atrial-fibrillation
#12
Nakkawee Saengklub, Vudhiporn Limprasutr, Suwanakiet Sawangkoon, Robert L Hamlin, Anusak Kijtawornrat
Atrial fibrillation (AF) is a supraventricular arrhythmia that leads to a decrease in cardiac output and impairs cardiac function and quality of life. Dronedarone has an atrial-selective property and has been used for management of AF in humans, but limited information is available in dogs. This study was designed to evaluate efficacy of dronedarone in attenuating the duration of AF in dog model of sustained AF. Six beagle dogs were anesthetized with isoflurane and instrumented to measure atrial action potential duration (aAPD) and atrial effective refractory period (AERP)...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28381738/a-new-missense-mutation-in-the-paired-domain-of-the-mouse-pax3-gene
#13
Tamio Ohno, Tomoki Maegawa, Hiroto Katoh, Yuki Miyasaka, Miyako Suzuki, Misato Kobayashi, Fumihiko Horio
Mice with dominant white spotting occurred spontaneously in the C3.NSY-(D11Mit74-D11Mit229) strain. Linkage analysis indicated that the locus for white spotting was located in the vicinity of the Pax3 gene on chromosome 1. Crosses of white-spotted mice showed that homozygosity for the mutation caused tail and limb abnormalities and embryonic lethality as a result of exencephaly; these phenotypes were analogous to those found in other Pax3 mutants. Sequence analysis identified a missense point mutation (c.101G>A) in exon 2 of Pax3 that resulted in a methionine to isoleucine conversion at amino acid 62 of the PAX3 protein...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28367889/obesity-induction-in-hamster-that-mimics-the-human-clinical-condition
#14
Vivian Jordania da Silva, Sílvia Regina Costa Dias, Tatiani Uceli Maioli, Luciana Ribeiro Serafim, Luis Fernando Viana Furtado, Maria da Gloria Quintão Silva, Ana Maria Caetano de Faria, Élida Mara Leite Rabelo
Although obesity is well established in hamsters, studies using diets with high levels of simple carbohydrate associated with lipids are necessary to assess the impact of this type of food in the body. In this study a high sugar and butter diet (HSB) and high temperature were employed towards this end. Obesity was successfully induced at a temperature of 30.3°C to 30.9°C after 38 days feeding the animals an HSB diet. It was shown that although diet is important for the induction of obesity, temperature is also essential because at a temperature slightly below the one required, obesity was not induced, even when the animals were fed for a longer period (150 days)...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28367864/body-surface-area-measurement-in-juvenile-miniature-pigs-using-a-computed-tomography-scanner
#15
Tadashi Itoh, Mifumi Kawabe, Takahiko Nagase, Hisami Matsushita, Masami Kato, Masafumi Miyoshi, Kazuro Miyahara
The use of miniature pigs in non-clinical studies for medical drugs or devices has gradually been increasing in recent years. It is anticipated that the use of juvenile miniature pigs in laboratory practice will also increase. Therefore, it is important to investigate various parameters of juvenile miniature pigs. The body surface area (BSA) of an organism is one of the important parameters for evaluating physiological functions. In drug development, normalization by BSA is an appropriate method for extrapolating doses between species...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28367863/ginsenoside-rb1-improves-cardiac-function-and-remodeling-in-heart-failure
#16
Xian Zheng, Shuai Wang, Xiaoming Zou, Yating Jing, Ronglai Yang, Siqi Li, Fengrong Wang
We investigated the effect of ginsenoside Rb1 on cardiac function and remodeling in heart failure (HF). Four weeks after HF induction, the rats were administrated with ginsenoside Rb1 (35 and 70 mg/kg) and losartan (4.5 mg/kg) for 8 weeks. Losartan was used as a positive control. Cardiac function was assessed by measuring hemodynamic parameters. Histological changes were analyzed by HE and Masson's trichrome staining. Cardiac hypertrophy, fibrosis, mitochondrial membrane potential and glucose transporter type 4 (GLUT4) levels were evaluated...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28302963/potassium-oxonate-induces-acute-hyperuricemia-in-the-tree-shrew-tupaia-belangeri-chinensis
#17
Dong-Hong Tang, You-Song Ye, Chen-Yun Wang, Zhe-Li Li, Hong Zheng, Kai-Li Ma
Potassium oxonate, a selectively competitive uricase inhibitor, produced hyperuricemia (HUA) in rodents in a previous study. In this study, we employed the tree shrew as an animal model to study potassium oxonate-induced HUA. The effect of allopurinol (ALLO), a uric acid reducer, was also examined in this model. Potassium oxonate at doses of 5, 20, 40, 60, 80, 100, and 1,000 mg/kg was given intraperitoneally to tree shrews. The results showed that potassium oxonate can effectively increase the levels of uric acid in tree shrews at doses ranging from 40 to 100 mg/kg...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28260717/difference-of-two-new-lcmv-strains-in-lethality-and-viral-genome-load-in-tissues
#18
Toshikazu Takagi, Makiko Ohsawa, Hitoki Yamanaka, Naoki Matsuda, Hiroshi Sato, Kazutaka Ohsawa
More than 30 strains of lymphocytic choriomeningitis virus (LCMV) have been isolated from mice, hamsters and humans in the United States, Europe and Japan. Experimentally infected mice exhibit different clinical signs and lethality depending on a combination of LCMV epitope peptides and host major histocompatibility complex (MHC) class I molecules. This study examined the pathogenicity, clinical signs and lethality, of two new LCMV strains (BRC and OQ28) using three inbred mouse strains with different genetic backgrounds having different H-2D haplotypes...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28228618/preventive-effect-of-intravesical-ozone-supplementation-on-n-methyl-n-nitrosourea-induced-non-muscle-invasive-bladder-cancer-in-male-rats
#19
Kerem Teke, Tayyar A Ozkan, Oguz O Cebeci, Hasan Yilmaz, Muhammed E Keles, Levend Ozkan, Meltem O Dillioglugil, Demir K Yildiz, Ozdal Dillioglugil
Although non-muscle invasive bladder cancer (NMIBC) is widely seen in men, most laboratory studies of new intravesical therapies to prevent NMIBC have been conducted on female animals. In addition, ozone (O3) has been shown to be a beneficial agent as an intravesical application in the treatment of various disorders. In the current study, we evaluated the immunohistopathological and oxidative-antioxidative effects of intravesical O3 treatment on n-methyl-n-nitrosourea (MNU)-induced NMIBC. Male Wistar-Albino rats (n=51) were divided into four groups: sham (n=6), O3 only (n=15), MNU only (n=15), and MNU+O3 (n=15)...
August 5, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28179596/nephron-wilms-tumor-1-wt1-and-synaptopodin-expression-in-developing-podocytes-of-mice
#20
Takashi Kato, Shinya Mizuno
Newborn mouse glomeruli are still immature with a morphological feature of an early capillary loop stage, but infant mice do not manifest proteinuria. Little is known about the molecular mechanism whereby infant mice are resistant to proteinuria. Nephrin and synaptopodin are crucial for slit diaphragm and foot process (FP) formation for avoiding proteinuria. Nephrin tyrosine phosphorylation means a transient biological signaling required for FP repair or extension during nephrotic disease. Using an immunohistochemical technique, we examined the natural course of nephrin, Wilms' tumor-1 (WT1) and synaptopodin at 16...
August 5, 2017: Experimental Animals
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