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Journal of Toxicologic Pathology

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https://www.readbyqxmd.com/read/28190929/databases-for-technical-aspects-of-immunohistochemistry
#1
Satoshi Furukawa, Mika Nagaike, Kiyokazu Ozaki
With the aims of sharing information about the technical aspects of immunohistochemistry (IHC) and making it possible to make a suitable choice of antibody for histopathological examination, this technical report describes the results of a questionnaire administered during the period of 2014 to 2015 to members of the Conference on Experimental Animal Histopathology. It also describes the immunological properties of primary antibodies (clone, supplier, catalog number, species reactivity, etc.) and the IHC staining conditions (fixing solution, fixing time, embedding, antigen retrieval method, antibody dilution, incubation time, incubation temperature, positive control tissue, secondary antibody information, etc...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190928/metastatic-hemangiosarcoma-of-the-liver-in-a-young-rat
#2
Makoto Tanaka, Seiji Miyoshi, Osamu Sawamoto
Spontaneous hemangiosarcoma is generally uncommon in rats. Furthermore, there are only a few case reports in young rats. This report describes a spontaneous hemangiosarcoma in a young 7-week-old rat. At necropsy, no remarkable changes were noted in any organs including the liver. Histopathologically, multifocal small tumors were located mainly in the perilobular region of the liver. The tumors comprised polygonal to short spindle-shaped cells that showed cellular atypia and local infiltration. In the foci, there were blood-filled spaces lined by spindle-shaped cells...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190927/hepatocellular-adenoma-with-severe-fatty-change-in-a-male-spontaneously-diabetic-torii-rat
#3
Eriko Taniai-Riya, Katsuhiro Miyajima, Kochi Kakimoto, Takeshi Ohta, Yuzo Yasui, Yusuke Kemmochi, Akiko Anagawa-Nakamura, Kaoru Toyoda, Akemi Takahashi, Toshiyuki Shoda
The Spontaneously Diabetic Torii (SDT) rat is a rat model of nonobese type 2 diabetes mellitus, and hepatocellular adenomas have not been reported in this model. We report a hepatocellular adenoma with severe fatty change in a male 42-week-old SDT rat fed a high-fat diet. At necropsy, the animal had a whitish nodular mass of approximately 2 cm in diameter in the right medial lobe. Histologically, the mass was well demarcated from the surrounding tissues, slightly compressing the adjacent hepatic parenchyma and widely compartmented by fibrous connective tissues...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190926/malignant-mast-cell-tumor-of-the-thymus-in-an-royal-college-of-surgeons-rcs-rat
#4
Yui Terayama, Tetsuro Matsuura, Kiyokazu Ozaki
A 152-week-old male Royal College of Surgeons (RCS) rat kept as a non-treated animal in a long-term animal study presented with a soft mass in the anterior mediastinum, which adhered to the pleura of the lung. Histopathologically, the mass mainly consisted of round to short spindle-shaped tumor cells that had infiltrated through the hyperplastic thymic tissue. The tumor cells were arranged in loose to dense sheets. Nuclei were moderate in size and round to spindle-shaped, with small nucleoli. Almost all tumor cells exhibited abundant eosinophilic cytoplasm, including eosinophilic granules of a range of sizes...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190925/spontaneous-infarcted-adenoma-of-the-mammary-gland-in-a-wistar-hannover-galas-rat
#5
Kohei Matsushita, Takeshi Toyoda, Kaoru Inoue, Tomomi Morikawa, Mizuki Sone, Kumiko Ogawa
Spontaneous massive infarction of mammary gland tumors has been reported to occur infrequently in humans. A subcutaneous mass (18 × 17 × 10 mm) was observed in the right axilla extending to the chest region of a 110-week-old female Wistar Hannover GALAS rat. Histopathologically, a well-circumscribed mass with lobular structures was present in the subcutis. Most of the mass was occupied by extensive coagulative necrosis of neoplastic cells with relatively uniform acinar and ductal structures. Although each necrotic acinar structure was separated by reticular fibers, periacinar stromal collagen fibers were not abundant...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190924/hyperglycemia-simultaneously-induces-initial-caries-development-and-enhances-spontaneous-occlusal-surface-wear-in-molar-teeth-related-to-parotid-gland-disorder-in-alloxan-induced-diabetic-rats
#6
Taiki Nishimoto, Yasushi Kodama, Tetsuro Matsuura, Kiyokazu Ozaki, Yoshihiko Taniguchi
Diabetes and salivary gland dysfunction are major factors that induce dental caries in experimental animals, but there are no reports analyzing the association of dental caries and salivary glands in an animal model of diabetes mellitus (DM). To clarify the initial development of dental caries and preceding salivary gland disorder, we performed a histopathological analysis on teeth and salivary glands in diabetic Wistar rats 7 weeks after alloxan treatment (DM group) in comparison with nondiabetic rats (Non-DM group) and functional analysis on saliva secretion during the experimental period...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190923/diphenylarsinic-acid-exerts-promotion-effects-on-hepatobiliary-carcinogenesis-in-a-rat-medium-term-multiorgan-carcinogenicity-bioassay
#7
Naomi Ishii, Min Gi, Masaki Fujioka, Shotaro Yamano, Mai Okumura, Anna Kakehashi, Hideki Wanibuchi
We have previously demonstrated that diphenylarsinic acid (DPAA) promotes liver carcinogenesis in rats in a medium-term liver carcinogenicity bioassay. However, the effects of DPAA on other organs have not been determined. In the present study, the effects of DPAA on carcinogenesis were investigated using a rat multiorgan carcinogenicity bioassay. A total of 60 six-week-old male F344 rats were treated with the carcinogens diethylnitrosamine, N-butyl-N-(4-hydroxybutyl) nitrosamine, N-methyl-N-nitrosourea, N-bis (2-hydroxypropyl) nitrosamine, and 1,2-dimethylhydrazine dihydrochloride to initiate carcinogenesis in multiple organs...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190922/histopathological-background-data-of-the-systemic-organs-of-clawn-miniature-swine-with-coronary-artery-stent-implantation
#8
Atsushi Isobe, Masako Tasaki, Tomoki Inoue, Hisako Terao, Junko Souba, Kasuke Nagano, Hitomi Hagiwara
The aim of this study was to identify potential changes that could occur during histological evaluations of CLAWN miniature swine, with potential consequences for subsequent experiments. The systemic organs from male and female CLAWN miniature swine (16.3-42.3 months old) that had been used in long-term studies of coronary stent implantation were examined histologically. Commonly observed histopathological findings were testicular/epididymal atrophy, cyst-like follicles in the ovaries, hemosiderin deposition in the spleen, lipofuscin deposition in the proximal tubular epithelia and presence of eosinophilic globules in the Bowman's space and the lumen of the proximal tubules in the kidneys, and cellular infiltration in several organs, including the eyelids, respiratory organs, and digestive tract...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190921/lethal-and-sublethal-effects-of-a-methomyl-based-insecticide-in-hoplobatrachus-rugulosus
#9
Waret Trachantong, Supap Saenphet, Kanokporn Saenphet, Monruedee Chaiyapo
The aim of this study was to investigate the lethal and sublethal toxicity of a methomyl-based insecticide in Hoplobatrachus rugulosus, as methomyl-based insecticides are applied in massive amounts and agrochemicals have effects on the decline in amphibian populations. To evaluate the toxic effects of methomyl from agricultural application, a methomyl-based insecticide containing 40% methomyl was selected. The median lethal concentration of 96 hours of methomyl exposure was 8.69 ppm for H. rugulosus tadpoles...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190920/acute-alloxan-renal-toxicity-in-the-rat-initially-causes-degeneration-of-thick-ascending-limbs-of-henle
#10
Yui Terayama, Yasushi Kodama, Tetsuro Matsuura, Kiyokazu Ozaki
Alloxan (AL) is a material well-known to induce diabetes. Prior to inducing a prolonged diabetic state, AL causes acute tubulointerstitial nephritis. However, the precise primary target site and mechanism of its nephrotoxicity remain unclear. The objective of this study was to evaluate the morphological characteristics relevant to acute renal toxicity following AL administration. Rats were intravenously treated with AL. Eight hours after AL treatment, aquaporin 1-negative and Na/K pump-positive thick ascending limbs of Henle (TAL) were degenerated in the outer medulla...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28190919/heterogeneity-of-tumor-cells-in-terms-of-cancer-initiating-cells
#11
REVIEW
Eiichi Morii
Tumors derive from a single cell clone but consist of heterogeneous cell subpopulations with diverse features and functions. A limited number of subclones with a selective advantage can initiate tumors when inoculated into immunocompromised mice, and are called cancer-initiating cells (CICs). CICs can be isolated from the bulk of tumors on the basis of their characteristics, such as high reagent efflux, degradation of reactive oxygen species, and aldehyde dehydrogenase (ALDH) activity. Under normal conditions, new CICs are produced by existing CICs rather than non-CICs...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821915/histopathological-localization-of-cadmium-in-rat-placenta-by-la-icp-ms-analysis
#12
Yoshikazu Yamagishi, Satoshi Furukawa, Ayano Tanaka, Yoshiyuki Kobayashi, Akihiko Sugiyama
In order to clarify the histological localization of cadmium (Cd) in the placenta, we analyzed paraffin sections of placentas from rats with a single Cd exposure on gestation day 18 by the LA-ICP-MS imaging method compared with the histopathological changes. The placentas were sampled at 1 hour, 2 hours, 3 hours, 6 hours, and 24 hours after treatment. Histopathologically, the trophoblasts in the labyrinth zone of the Cd group showed swelling at 1 hour. At 2 and 3 hours, the trophoblasts showed swelling and vacuolar degeneration...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821914/spontaneous-extraskeletal-osteosarcoma-in-the-duodenum-of-a-crlj-cd1-icr-mouse
#13
Ryo Ando, Shinichiro Ikezaki, Yuko Yamaguchi, Kazutoshi Tamura, Toru Hoshiya
Extraskeletal osteosarcoma is a very rare tumor in humans and animals. This paper describes a case of extraskeletal osteosarcoma observed in the duodenum of a male ICR mouse. Grossly, a solid mass pushing up the tunica serosa was observed in the duodenal wall. Histologically, the tumor was located in the lamina propria mucosae and tela mucosa. Neoplastic cells densely proliferated in these areas, and replaced of the normal tissue components. A small amount of osteoid and a small clump of bone tissue were observed in the area of neoplastic cell proliferation, especially in the lamina propria mucosae...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821913/a-case-report-of-a-metastatic-yolk-sac-carcinoma-in-the-pulmonary-artery-of-a-young-female-sprague-dawley-rat
#14
Yohei Sakamoto, Takaharu Nagaoka, Kei Tamura, Hideshi Kaneko
Yolk sac carcinoma is an extremely rare tumor in rats and is usually found in the genital system of aged animals. We encountered a yolk sac carcinoma in the pulmonary artery of an 18-week-old female Sprague-Dawley rat. In a repeated dosing toxicity study (once weekly for 4 weeks, intraperitoneal), this rat was unexpectedly found dead on the 55th day after the final administration of the test article. At necropsy, grayish white nodules were found on the lung surface. Histopathologically, tumor emboli were observed in the trunk and branch of the pulmonary artery...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821912/accumulation-of-mott-cells-in-the-spleen-in-a-cb6f1-tg-rash2-mouse
#15
Tomoya Sano, Yuichi Takai, Hisashi Anayama, Takeshi Watanabe, Ryo Fukuda
Mott cells are a variant form of plasma cells in humans and laboratory animals. This report describes the morphological characteristics of Mott cells observed in a 33-week-old female CB6F1-Tg rasH2 mouse. Microscopically, a large number of round cells with abundant eosinophilic globules, which were variable in size, were observed in the spleen and were densely distributed in the red pulp adjacent to the marginal zone. A few similar cells were present in the submandibular lymph node and bone marrow. Neither systemic nor local chronic inflammatory changes were seen in this animal...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821911/acute-alloxan-toxicity-causes-granulomatous-tubulointerstitial-nephritis-with-severe-mineralization
#16
Lianshan Zhang, Yui Terayama, Taiki Nishimoto, Yasushi Kodama, Kiyokazu Ozaki
Alloxan had been recognized as having a direct nephrotoxic effect different from its diabetogenic action. We encountered previously unreported granulomatous tubulointerstitial nephritis with severe luminal and interstitial mineralization in one diabetic rat after one week of alloxan administration. Histopathologically, many dilated and occluded proximal and distal tubules were segmentally observed in the cortex and outer medulla. The tubular lumen contained minerals and cell debris. Tubular epithelial cells were degenerated and piled up, and they protruded into the lumen, where they enveloped minerals...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821910/celecoxib-alleviates-oxaliplatin-induced-hyperalgesia-through-inhibition-of-spinal-erk1-2-signaling
#17
Hongping Chen, Qinghua Wang, Danni Shi, Dongbo Yao, Lei Zhang, Junping Xiong, Baohua Xu
Numerous pieces of evidence have revealed that oxaliplatin (OXA) evokes mechanical and cold hypersensitivity. However, the mechanism underlying these bothersome side effects needs to be further investigated. It is well known that cyclooxygenase-2 (COX-2) and extracellular signal-regulated kinases (ERK1/2) signaling play crucial roles in several pain states. Our previous data showed that Akt2 in the dorsal root ganglion (DRG) participated in the regulation of OXA-induced neuropathic pain. But it is still unclear whether spinal ERK1/2 signaling is involved in the regulation of OXA-induced hyperalgesia, and the linkage between COX-2 and ERK1/2 signaling in mediating OXA-induced hyperalgesia also remains unclear...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821909/quercetin-inhibited-cadmium-induced-autophagy-in-the-mouse-kidney-via-inhibition-of-oxidative-stress
#18
Yuan Yuan, Shixun Ma, Yongmei Qi, Xue Wei, Hui Cai, Li Dong, Yufeng Lu, Yupeng Zhang, Qingjin Guo
The objective of the current study was to explore the inhibitory effects of quercetin on cadmium-induced autophagy in mouse kidneys. Mice were intraperitoneally injected with cadmium and quercetin once daily for 3 days. The LC3-II/β-actin ratio was used as the autophagy marker, and autophagy was observed by transmission electron microscopy. Oxidative stress was investigated in terms of reactive oxygen species, total antioxidant capacity, and malondialdehyde. Cadmium significantly induced typical autophagosome formation, increased the LC3-II/β-actin ratio, reactive oxygen species level, and malondialdehyde content, and decreased total antioxidant capacity...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821908/4-methylthio-3-butenyl-isothiocyanate-raphasatin-exerts-chemopreventive-effects-against-esophageal-carcinogenesis-in-rats
#19
Isamu Suzuki, Young-Man Cho, Tadashi Hirata, Takeshi Toyoda, Jun-Ichi Akagi, Yasushi Nakamura, Eun Young Park, Azusa Sasaki, Takako Nakamura, Shigehisa Okamoto, Koji Shirota, Noboru Suetome, Akiyoshi Nishikawa, Kumiko Ogawa
To examine the effects of 4-methylthio-3-butenyl isothiocyanate on esophageal carcinogenesis, male 6-week-old F344 rats were subcutaneously injected with 0.5 mg/kg body weight N-nitrosomethylbenzylamine three times per week for 5 weeks and fed a diet supplemented with 80 ppm 4-methylthio-3-butenyl isothiocyanate, equivalent to 6.05 mg/kg body weight/day for the initiation stage, 4.03 mg/kg body weight/day for the promotion stage, or 4.79 mg/kg body weight/day for all stages. Although the incidence of lesions was not affected by 4-methylthio-3-butenyl isothiocyanate treatment, the multiplicity of squamous cell papilloma in the esophagus was significantly decreased in rats in the 4-methylthio-3-butenyl isothiocyanate initiation stage group (1...
October 2016: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/27821907/alteration-of-microrna-expressions-in-the-pons-and-medulla-in-rats-after-3-3-iminodipropionitrile-administration
#20
Keiko Ogata, Masahiko Kushida, Kaori Miyata, Kayo Sumida, Shuji Takeda, Takeshi Izawa, Mitsuru Kuwamura, Jyoji Yamate
Although 3,3'-iminodipropionitrile (IDPN) is widely used as a neurotoxicant to cause axonopathy due to accumulation of neurofilaments in several rodent models, its mechanism of neurotoxicity has not been fully understood. In particular, no information regarding microRNA (miRNA) alteration associated with IDPN is available. This study was conducted to reveal miRNA alteration related to IDPN-induced neurotoxicity. Rats were administered IDPN (20, 50, or 125 mg/kg/day) orally for 3, 7, and 14 days. Histopathological features were investigated using immunohistochemistry for neurofilaments and glial cells, and miRNA alterations were analyzed by microarray and reverse transcription polymerase chain reaction...
October 2016: Journal of Toxicologic Pathology
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