1
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Li C, Deng Y, Pan Y, Liao X, Xie H, Xue X, Yu S, Yu W, Yu G. Metformin dampens the progression of cholangiofibrosis induced by thioacetamide using deep learning. Heliyon 2024; 10:e37347. [PMID: 39309781 PMCID: PMC11416239 DOI: 10.1016/j.heliyon.2024.e37347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 08/29/2024] [Accepted: 09/02/2024] [Indexed: 09/25/2024] Open
Abstract
Purpose The consistent use of metformin has been linked to a reduced incidence of neoplastic diseases among diabetic populations. As a preventive intervention, metformin may offer a more favorable risk-benefit profile. Here, we explored the efficacy of metformin in the primary prevention of cholangiofibrosis, which can precede the carcinogen-induced development of cholangiocarcinoma (CCA). Our objective was to assess the potential of metformin to act as an intervention prior to the onset of these conditions. Methods A rat model of thioacetamide (TAA)-induced cholangiofibrosis was utilized to assess the impact of metformin on the induction process of cholangiocarcinoma (CCA). Liver tissues were harvested and analyzed histologically using light microscopy, complemented by a deep-learning convolutional neural network for enhanced evaluation. Additionally, RNA sequencing (RNA-seq) was performed to investigate the genetic alterations associated with metformin treatment in this TAA-induced cholangiofibrosis model. Results In the rat model, the TAA control group exhibited an increased incidence and average count of cholangiofibrosis cases in the liver, with rates of 100 % and an average of 12.0, compared to the metformin-treated group, which showed an incidence of 70 % and an average of 3.3. Notably, the progression from normal cholangioles to cholangiofibrosis was associated with the upregulation of several proteins critical for metabolic processes and the tumor microenvironment. These alterations were significantly mitigated by metformin treatment. Conclusions Long-term metformin use may offer protective benefits against cholangiofibrosis, partially by regulating metabolic processes and improving the tumor microenvironment.
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Affiliation(s)
- Chaofu Li
- Department of Oncology, Liuzhou Worker's Hospital, Guangxi, 545005, China
| | - Yating Deng
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, 200032, China
| | - Yating Pan
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, 200032, China
| | - Xinyi Liao
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, 200032, China
| | - Huadong Xie
- Department of Surgery, Liuzhou Worker's Hospital, Guangxi, 545005, China
| | - Xiaoli Xue
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, 200032, China
| | - Shaoqing Yu
- Allergy and Cancer Research Center, Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, China
| | - Wenlong Yu
- Department of Biliary Tract Surgery, Shanghai Eastern Hepatobiliary Surgery Hospital, Naval Medical University, Shanghai, 200438, China
| | - Guanzhen Yu
- Allergy and Cancer Research Center, Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, China
- Medical Artificial Intelligence Laboratory, Zhejiang Institute of Digital Media, Chinese Academy of Science, Shaoxing, 312366, China
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2
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Takagi M, Yamaguchi Y, Yamakawa S, Tamura K. Malignant pinealoma observed in the deep cerebral parenchyma of a male Wistar rat. J Toxicol Pathol 2022; 35:117-121. [PMID: 35221505 PMCID: PMC8828600 DOI: 10.1293/tox.2021-0047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 11/02/2021] [Indexed: 11/23/2022] Open
Abstract
This report describes a case of spontaneous malignant pinealoma in a 90-week-old male
Wistar rat. The tumor mass occurred in the deep cerebral parenchyma and no intact pineal
gland was observed in the area between the posterior-dorsal median line of the cerebrum
and the cerebellum. The tumor was characterized by a large nodular proliferation occupying
the central area of the brain, extending from the dorsal surface to the base of the brain,
corresponding to the thalamus. The tumor cells had round to irregular oblong nuclei
approximately 5–17 μm in diameter and showed faintly or moderately eosinophilic cytoplasm
and indistinct cell boundaries. Immunohistochemically, the tumor cells were positive for
synaptophysin and partially positive for neuron-specific enolase (NSE). The tumor showed
malignant features including cellular pleomorphism, high mitotic index, necrotic foci, and
invasive and extensive growth and was, therefore, diagnosed as an extremely rare malignant
pinealoma in the deep cerebral parenchyma.
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Affiliation(s)
- Mizuho Takagi
- Pathology Division, BoZo Research Center Inc., 1284 Kamado, Gotemba-shi, Shizuoka 412-0039, Japan
| | - Yuko Yamaguchi
- Pathology Division, BoZo Research Center Inc., 1284 Kamado, Gotemba-shi, Shizuoka 412-0039, Japan
| | - Seiki Yamakawa
- Pathology Division, BoZo Research Center Inc., 1284 Kamado, Gotemba-shi, Shizuoka 412-0039, Japan
| | - Kazutoshi Tamura
- Pathology Division, BoZo Research Center Inc., 1284 Kamado, Gotemba-shi, Shizuoka 412-0039, Japan
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3
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Li C, Zhao X, Gu X, Chen Y, Yu G. The Preventive Role of Hydrogen-Rich Water in Thioacetamide-Induced Cholangiofibrosis in Rat Assessed by Automated Histological Classification. Front Pharmacol 2021; 12:632045. [PMID: 34489690 PMCID: PMC8417776 DOI: 10.3389/fphar.2021.632045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 06/24/2021] [Indexed: 01/01/2023] Open
Abstract
Background: Cholangiofibrosis is a controversial intrahepatic cholangial lesion that precedes the development of cholangiocarcinoma. Here, we demonstrate that molecular hydrogen (H2) can be used to effectively prevent cholangiofibrosis. Methods: The safety and quality of life (QOL) of rats was firstly evaluated. H2 was administered to rats subjected to thioacetamide (TAA)-induced cholangiofibrosis throughout the whole process. Then, rats were administrated with TAA for 3 months and then followed by H2 intervention. Rat livers were harvested and assessed by light microscopy and convolutional neural network. RNA-seq was performed to analyze the genetic changes in these animal models. Results: Continuous use of H2-rich water was safe and improved QOL.The incidence and average number of cholangiofibrosis in the liver were higher in the TAA group (100%, 12.0 ± 10.07) than that in the H2 group (57.1%, 2.86 ± 5.43). The AI algorithm revealed higher Alesion/Aliver in the TAA group (19.6% ± 9.01) than that in the H2 group (7.54% ± 11.0). RNA-seq analysis revealed that H2 results in a decline in glycolysis. Moreover, in the third experiment, the incidence of microscopic or suspicious tumors and the ratio of liver lesions was decreased after long-term use of H2 (12.5%, 0.57% ± 0.45) compared with untreated group (100%, 0.98% ± 0.73). A number of intestinal microbiota was changed after H2 usage, including clostridiaceae_1, ruminococcus, turicibacter, coriobacteriales, actinobacteria, and firmicutes_bacterium. Conclusion: Hydrogen-rich water protects against liver injury and cholangiofibrosis and improved quality of life partially through regulating the composition of intestinal flora.
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Affiliation(s)
- Chaofu Li
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.,Department of Oncology, Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, China
| | - Xing Zhao
- Department of Oncology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, China
| | - Xiaoqiang Gu
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ying Chen
- Department of Pathology, Changhai Hospital, Shanghai, China
| | - Guanzhen Yu
- Department of Oncology, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.,Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China
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4
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Nishina H, Kashimura A, Sakairi T, Nishikawa S, Mizukawa M, Sato H. Spontaneous hyaline glomerulopathy in a young Slc:ICR mouse. J Toxicol Pathol 2020; 33:303-307. [PMID: 33239849 PMCID: PMC7677629 DOI: 10.1293/tox.2020-0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 07/22/2020] [Indexed: 11/23/2022] Open
Abstract
Hyaline glomerulopathy is a type of glomerular lesion that occurs in aging mice.
Spontaneous hyaline glomerulopathy is rare in young mice. Here, we report spontaneous
hyaline glomerulopathy in a young adult (15-week-old) ICR mouse. Necropsy revealed
discoloration and roughness of the kidney surface. Microscopically, diffuse glomerular
lesions were prominent. Amorphous, eosinophilic materials were deposited globally in the
glomeruli. The mesangial region was expanded; however, the mesangial cells showed no
proliferation. Thickening of the Bowman’s capsule with proliferation of parietal
epithelial cells was observed. Glomerular deposits were strongly positive for anti-IgM,
anti-IgG, and periodic acid-Schiff stain and were stained red by Masson’s trichrome stain.
The deposits were negative for anti C3 and stained negatively with Congo red stain.
Periodic acid methenamine silver and electron microscopy revealed glomerular deposits
limited to intraglomerular capillaries. Based on the histological features, we diagnosed
this lesion as hyaline glomerulopathy. This case could improve our understanding of
spontaneous lesions in toxicological and pharmacological studies.
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Affiliation(s)
- Hironobu Nishina
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Akane Kashimura
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Tetsuya Sakairi
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Satomi Nishikawa
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Mao Mizukawa
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Hiroko Sato
- Safety Research Laboratories, Sohyaku. Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
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5
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Krishnatreyya H, Hazarika H, Saha A, Chattopadhyay P. Fundamental pharmacological expressions on ocular exposure to capsaicin, the principal constituent in pepper sprays. Sci Rep 2018; 8:12153. [PMID: 30108241 PMCID: PMC6092351 DOI: 10.1038/s41598-018-30542-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 08/01/2018] [Indexed: 12/19/2022] Open
Abstract
Eye irritation assessment is compulsory to anticipate health risks in military personnel exposed to riot control agents such as capsaicin, the principal constituent of oleoresin capsicum, or pepper sprays. The present work investigates certain fundamental yet unaddressed pharmacological manifestations on ocular exposure to capsaicin. Ocular pharmacology of capsaicin was studied using acute eye irritation (AEI), bovine corneal opacity and permeability (BCOP) assay, corneal fluorescein staining and indirect ophthalmoscopy studies, transcorneal permeation, Schirmer tear secretion test, nerve conduction velocity study and enzyme-linked immunosorbent assay (ELISA). Additionally, histopathology and scanning electron microscopy (SEM) of bovine corneas and rat optic nerves were done to further estimate capsaicin induced morphological variations. Our findings demonstrated that AEI, BCOP, corneal fluorescein staining and indirect ophthalmoscopy were useful in assessing capsaicin induced ocular irritation; AEI and BCOP also contributed towards indicating the eye irritation potential of capsaicin as per the United Nations Globally Harmonized System of Classification and Labelling of Chemicals categorization. Additional experimental observations include considerable transcorneal permeation of capsaicin, capsaicin induced reduction in tear secretions and nerve conduction velocity and increased expression of proinflammatory cytokines by ELISA. Histopathology and SEM were favourable techniques for the detection of capsaicin induced ocular physiological modifications.
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Affiliation(s)
- Harshita Krishnatreyya
- Division of Pharmaceutical Technology, Defence Research Laboratory (DRL), Defence Research and Development Organization (DRDO), Tezpur, Assam, India.,Pharmaceutical and Fine Chemical division, Department of Chemical Technology, University of Calcutta, Kolkata, India
| | - Hemanga Hazarika
- Division of Pharmaceutical Technology, Defence Research Laboratory (DRL), Defence Research and Development Organization (DRDO), Tezpur, Assam, India
| | - Achintya Saha
- Pharmaceutical and Fine Chemical division, Department of Chemical Technology, University of Calcutta, Kolkata, India
| | - Pronobesh Chattopadhyay
- Division of Pharmaceutical Technology, Defence Research Laboratory (DRL), Defence Research and Development Organization (DRDO), Tezpur, Assam, India.
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6
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Ramos MF, Baker J, Atzpodien EA, Bach U, Brassard J, Cartwright J, Farman C, Fishman C, Jacobsen M, Junker-Walker U, Kuper F, Moreno MCR, Rittinghausen S, Schafer K, Tanaka K, Teixeira L, Yoshizawa K, Zhang H. Nonproliferative and Proliferative Lesions of the Ratand Mouse Special Sense Organs(Ocular [eye and glands], Olfactory and Otic). J Toxicol Pathol 2018; 31:97S-214S. [PMID: 30158741 PMCID: PMC6108092 DOI: 10.1293/tox.31.97s] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
| | - Julia Baker
- Member of eye subgroup
- Charles River Laboratories, Inc., Frederick, MD, USA
| | | | - Ute Bach
- Member of eye subgroup
- Bayer AG, Wuppertal, Germany
| | | | | | | | - Cindy Fishman
- Member of eye subgroup
- Member of glands of the eye subgroup
- GlaxoSmithKline, King of Prussia, PA, USA
| | | | | | - Frieke Kuper
- Member of olfactory subgroup
- Retired; formerly The Netherlands Organization for Applied
Scientific Research (TNO), Zeist, the Netherlands
| | | | | | - Ken Schafer
- Member of eye subgroup
- Member of otic subgroup
- Vet Path Services, Inc., Mason, OH, USA
| | - Kohji Tanaka
- Member of eye subgroup
- Nippon Boehringer Ingelheim, Japan
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7
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Elmore SA, Aeffner F, Bangari DS, Crabbs TA, Fossey S, Gad SC, Haschek WM, Hoane JS, Janardhan K, Kovi RC, Pearse G, Wancket LM, Quist EM. Proceedings of the 2017 National Toxicology Program Satellite Symposium. Toxicol Pathol 2017; 45:799-833. [PMID: 29113559 PMCID: PMC5743204 DOI: 10.1177/0192623317733924] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The 2017 annual National Toxicology Program Satellite Symposium, entitled "Pathology Potpourri," was held in Montreal, Quebec, Canada at the Society of Toxicologic Pathology's 36th annual meeting. The goal of this symposium was to present and discuss challenging diagnostic pathology and/or nomenclature issues. This article presents summaries of the speakers' talks along with select images that were used by the audience for voting and discussion. Various lesions and other topics covered during the symposium included renal papillary degeneration in perinatally exposed animals, an atriocaval mesothelioma, an unusual presentation of an alveolar-bronchiolar carcinoma, a paraganglioma of the organ of Zuckerkandl (also called an extra-adrenal pheochromocytoma), the use of human muscle samples to illustrate the challenges of manual scoring of fluorescent staining, intertubular spermatocytic seminomas, medical device pathology assessment and discussion of the approval process, collagen-induced arthritis, incisor denticles, ameloblast degeneration and poorly mineralized enamel matrix, connective tissue paragangliomas, microcystin-LR toxicity, perivascular mast cells in the forebrain thalamus unrelated to treatment, and 2 cases that provided a review of the International Harmonization of Nomenclature and Diagnostic Criteria (INHAND) bone nomenclature and recommended application of the terminology in routine nonclinical toxicity studies.
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Affiliation(s)
- Susan A. Elmore
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina
| | | | | | - Torrie A. Crabbs
- Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina
| | | | | | - Wanda M. Haschek
- University of Illinois, Department of Pathobiology, Urbana, Illinois
| | | | | | - Ramesh C. Kovi
- Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina
| | - Gail Pearse
- GlaxoSmithKline, Ware, Hertfordshire, United Kingdom
| | | | - Erin M. Quist
- Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina
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8
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Elmore SA, Chen VS, Hayes-Bouknight S, Hoane JS, Janardhan K, Kooistra LH, Nolte T, Szabo KA, Willson GA, Wolf JC, Malarkey DE. Proceedings of the 2016 National Toxicology Program Satellite Symposium. Toxicol Pathol 2016; 45:11-51. [PMID: 27821709 DOI: 10.1177/0192623316672074] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The 2016 annual National Toxicology Program Satellite Symposium, entitled "Pathology Potpourri" was held in San Diego, CA, at the Society of Toxicologic Pathology's (STP) 35th annual meeting. The goal of this symposium was to present and discuss challenging diagnostic pathology and/or nomenclature issues. This article presents summaries of the speakers' talks, along with select images that were used by the audience for voting and discussion. Some lesions and topics covered during the symposium included malignant glioma and histiocytic sarcoma in the rodent brain; a new statistical method designed for histopathology data evaluation; uterine stromal/glandular polyp in a rat; malignant plasma cell tumor in a mouse brain; Schwann cell proliferative lesions in rat hearts; axillary schwannoma in a cat; necrosis and granulomatous inflammation in a rat brain; adenoma/carcinoma in a rat adrenal gland; hepatocyte maturation defect and liver/spleen hematopoietic defects in an embryonic mouse; distinguishing malignant glioma, malignant mixed glioma, and malignant oligodendroglioma in the rat; comparison of mammary gland whole mounts and histopathology from mice; and discussion of the International Harmonization of Nomenclature and Diagnostic Criteria collaborations.
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Affiliation(s)
- Susan A Elmore
- 1 National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Vivian S Chen
- 2 Charles River Laboratories, Inc., Durham, North Carolina, USA
| | | | - Jessica S Hoane
- 2 Charles River Laboratories, Inc., Durham, North Carolina, USA
| | | | | | - Thomas Nolte
- 4 Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim, Germany
| | | | - Gabrielle A Willson
- 5 Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina, USA
| | - Jeffrey C Wolf
- 6 Experimental Pathology Laboratories, Inc., Sterling, Virginia, USA
| | - David E Malarkey
- 1 National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
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9
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van der Laan JW, Buitenhuis WHW, Wagenaar L, Soffers AEMF, van Someren EP, Krul CAM, Woutersen RA. Prediction of the Carcinogenic Potential of Human Pharmaceuticals Using Repeated Dose Toxicity Data and Their Pharmacological Properties. Front Med (Lausanne) 2016; 3:45. [PMID: 27790617 PMCID: PMC5063850 DOI: 10.3389/fmed.2016.00045] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/20/2016] [Indexed: 01/06/2023] Open
Abstract
In an exercise designed to reduce animal use, we analyzed the results of rat subchronic toxicity studies from 289 pharmaceutical compounds with the aim to predict the tumor outcome of carcinogenicity studies in this species. The results were obtained from the assessment reports available at the Medicines Evaluation Board of the Netherlands for 289 pharmaceutical compounds that had been shown to be non-genotoxic. One hundred forty-three of the 239 compounds not inducing putative preneoplastic lesions in the subchronic study did not induce tumors in the carcinogenicity study [true negatives (TNs)], whereas 96 compounds were categorized as false negatives (FNs) because tumors were observed in the carcinogenicity study. Of the remaining 50 compounds, 31 showed preneoplastic lesions in the subchronic study and tumors in the carcinogenicity study [true positives (TPs)], and 19 only showed preneoplastic lesions in subchronic studies but no tumors in the carcinogenicity study [false positives (FPs)]. In addition, we then re-assessed the prediction of the tumor outcome by integrating the pharmacological properties of these compounds. These pharmacological properties were evaluated with respect to the presence or absence of a direct or indirect proliferative action. We found support for the absence of cellular proliferation for 204 compounds (TN). For 67 compounds, the presence of cellular hyperplasia as evidence for proliferative action could be found (TP). Therefore, this approach resulted in an ability to predict non-carcinogens at a success rate of 92% and the ability to detect carcinogens at 98%. The combined evaluation of pharmacological and histopathological endpoints eventually led to only 18 unknown outcomes (17 categorized as FN and 1 as FP), thereby enhancing both the negative and positive predictivity of an evaluation based upon histopathological evaluation only. The data show the added value of a consideration of the pharmacological properties of compounds in relation to potential class effects, both in the negative and positive direction. A high negative and a high positive predictivity will both result in waiving the need for conducting 2-year rat carcinogenicity studies, if this is accepted by Regulatory Authorities, which will save large numbers of animals and reduce drug development costs and time.
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Affiliation(s)
- Jan Willem van der Laan
- Medicines Evaluation Board, Utrecht, Netherlands
- Division of Toxicology, Leiden Academic Center for Drug Research, Leiden, Netherlands
| | | | | | - Ans E. M. F. Soffers
- Division of Toxicology, Wageningen University and Research Centre, Wageningen, Netherlands
| | | | | | - Ruud A. Woutersen
- Division of Toxicology, Wageningen University and Research Centre, Wageningen, Netherlands
- TNO Innovation for Life, Zeist, Netherlands
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10
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Elmore SA, Farman CA, Hailey JR, Kovi RC, Malarkey DE, Morrison JP, Neel J, Pesavento PA, Porter BF, Szabo KA, Teixeira LBC, Quist EM. Proceedings of the 2015 National Toxicology Program Satellite Symposium. Toxicol Pathol 2016; 44:502-35. [PMID: 27075180 DOI: 10.1177/0192623316631844] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The 2015 Annual National Toxicology Program Satellite Symposium, entitled "Pathology Potpourri" was held in Minneapolis, Minnesota, at the American College of Veterinary Pathologists/American Society for Veterinary Clinical Pathology/Society of Toxicologic Pathology combined meeting. The goal of this symposium is to present and discuss diagnostic pathology challenges or nomenclature issues. Because of the combined meeting, both laboratory and domestic animal cases were presented. This article presents summaries of the speakers' talks, including challenging diagnostic cases or nomenclature issues that were presented, along with select images that were used for audience voting and discussion. Some lesions and topics covered during the symposium included hepatocellular lesions, a proposed harmonized diagnostic approach to rat cardiomyopathy, crop milk in a bird, avian feeding accoutrement, heat exchanger in a tuna, metastasis of a tobacco carcinogen-induced pulmonary carcinoma, neurocytoma in a rat, pituicytoma in a rat, rodent mammary gland whole mounts, dog and rat alveolar macrophage ultrastructure, dog and rat pulmonary phospholipidosis, alveolar macrophage aggregation in a dog, degenerating yeast in a cat liver aspirate, myeloid leukemia in lymph node aspirates from a dog, Trypanosoma cruzi in a dog, solanum toxicity in a cow, bovine astrovirus, malignant microglial tumor, and nomenclature challenges from the Special Senses International Harmonization of Nomenclature and Diagnostic Criteria Organ Working Group.
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Affiliation(s)
- Susan A Elmore
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | | | | | - Ramesh C Kovi
- Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina, USA
| | - David E Malarkey
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | | | - Jennifer Neel
- College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Patricia A Pesavento
- School of Veterinary Medicine, University of California at Davis, Davis, California, USA
| | | | | | | | - Erin M Quist
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
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11
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Hoane JS, Johnson CL, Morrison JP, Elmore SA. Comparison of Renal Amyloid and Hyaline Glomerulopathy in B6C3F1 Mice: An NTP Retrospective Study. Toxicol Pathol 2016; 44:687-704. [PMID: 27000376 DOI: 10.1177/0192623316630625] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Due to potential misdiagnosis of hyaline glomerulopathy (HG) for amyloidosis, a retrospective study of B6C3F1 mice from the National Toxicology Program (NTP) archives was undertaken to determine whether HG had occurred in prior NTP studies and, if so, whether these 2 glomerular lesions could be routinely discriminated. Kidney slides from 7 amyloid-positive control mice, 2 HG-positive control mice, 3 normal or negative control mice, and 41 potential HG mice (with renal-only deposits previously diagnosed as amyloid) were evaluated using hematoxylin and eosin (H&E), periodic acid Schiff (PAS), Congo red (CR), and Masson's trichrome (MT) stains. Utilizing these techniques, HG was reliably distinguished from amyloidosis. All 41 potential HG mice had glomerular deposits histochemically inconsistent with amyloid; the deposits were PAS positive and CR negative. Four of the 41 mice were selected for transmission electron microscopy of the glomerular deposits; ultrastructurally, the deposits in these animals were consistent with HG and not amyloid. Our findings indicate that HG is a spontaneous lesion in B6C3F1 mice of low occurrence, is commonly misdiagnosed as amyloidosis, and is more likely than amyloid to cause glomerular deposits in mice without evidence of deposits in other tissues. Also, HG can be distinguished from amyloid on H&E evaluation; however, the distinction is improved with use of PAS or CR staining and/or ultraviolet evaluation.
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Affiliation(s)
- Jessica S Hoane
- Charles River Laboratories, Inc., Durham, North Carolina, USA
| | | | | | - Susan A Elmore
- National Toxicology Program (NTP), National Institute of Environmental Health Sciences (NIEHS), Research Triangle Park, North Carolina, USA
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12
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Radaelli E, Castiglioni V, Recordati C, Gobbi A, Capillo M, Invernizzi A, Scanziani E, Marchesi F. The Pathology of Aging 129S6/SvEvTac Mice. Vet Pathol 2015; 53:477-92. [PMID: 26467077 DOI: 10.1177/0300985815608673] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The 129 mouse strain is commonly used for the generation of genetically engineered mice. Genetic drift or accidental contamination during outcrossing has resulted in several 129 substrains. Comprehensive data on spontaneous age-related pathology exist for the 129S4/SvJae substrain, whereas only limited information is available for other 129 substrains. This longitudinal aging study describes the life span and spontaneous lesions of 44 male and 18 female mice of the 129S6/SvEvTac substrain. Median survival time was 778 and 770 days for males and females, respectively. Tumors of lung and Harderian gland were the most common neoplasms in both sexes. Hepatocellular tumors occurred mainly in males. Hematopoietic tumors were observed at low frequency. Suppurative and ulcerative blepharoconjunctivitis was the most common nonneoplastic condition in both sexes. Corynebacteria (primarily Corynebacterium urealyticum and C. pseudodiphtheriticum) were isolated from animals with blepharoconjunctivitis and in some cases from unaffected mice, although a clear causal association between corynebacterial infections and blepharoconjunctivitis could not be inferred. Polyarteritis occurred only in males and was identified as the most common nonneoplastic contributory cause of death. Eosinophilic crystalline pneumonia occurred in both sexes and was a relevant cause of death or comorbidity. Epithelial hyalinosis at extrapulmonary sites was noted at higher frequency in females. This study contributes important data on the spontaneous age-related pathology of the 129S6/SvEvTac mouse substrain and is a valuable reference for evaluation of the phenotype in genetically engineered mice obtained with this 129 substrain.
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Affiliation(s)
- E Radaelli
- VIB11 Center for the Biology of Disease, KU Leuven Center for Human Genetics, Leuven, Belgium InfraMouse, KU Leuven-VIB, Leuven, Belgium
| | - V Castiglioni
- Mouse and Animal Pathology Laboratory, Filarete Foundation, Milan, Italy
| | - C Recordati
- Mouse and Animal Pathology Laboratory, Filarete Foundation, Milan, Italy
| | - A Gobbi
- COGENTECH SCARL, Milan, Italy Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
| | - M Capillo
- COGENTECH SCARL, Milan, Italy Department of Experimental Oncology, European Institute of Oncology, Milan, Italy
| | - A Invernizzi
- Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna, Sezione di Milano, Milan, Italy
| | - E Scanziani
- Mouse and Animal Pathology Laboratory, Filarete Foundation, Milan, Italy Department of Veterinary Sciences and Public Health, University of Milan, Milan, Italy
| | - F Marchesi
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland
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13
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Elmore SA, Cora MC, Gruebbel MM, Hayes SA, Hoane JS, Koizumi H, Peters R, Rosol TJ, Singh BP, Szabo KA. Proceedings of the 2014 National Toxicology Program Satellite Symposium. Toxicol Pathol 2014; 43:10-40. [PMID: 25385331 DOI: 10.1177/0192623314555526] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The 2014 annual National Toxicology Program (NTP) Satellite Symposium, entitled "Pathology Potpourri" was held in Washington, D.C., in advance of the Society of Toxicologic Pathology's 33rd annual meeting. The goal of this annual NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers' presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting and discussion. Some lesions and topics covered during the symposium included a pulmonary mucinous adenocarcinoma in a male B6C3F1 mouse; plexiform vasculopathy in Wistar Han (Crl:WI[Han]) rats; staging of the estrous cycle in rats and mice; peri-islet fibrosis, hemorrhage, lobular atrophy and inflammation in male Sprague-Dawley (SD) rats; retinal dysplasia in Crl:WI[Han] rats and B6C3F1 mice; multicentric lymphoma with intravascular microemboli and tumor lysis syndrome, and 2 cases of myopathy and vascular anomaly in Tg.rasH2 mice; benign thymomas in Crl:WI[Han] rats; angiomatous lesions in the mesenteric lymph nodes of Crl:WI[Han] rats; an unusual foveal lesion in a cynomolgous monkey; and finally a series of nomenclatures challenges from the endocrine International Harmonization of Nomenclature and Diagnostic Criteria (INHAND) Organ Working Group (OWG).
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Affiliation(s)
- Susan A Elmore
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Michelle C Cora
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Margarita M Gruebbel
- Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina, USA
| | - Schantel A Hayes
- Charles River Laboratories, Pathology Associates, Durham, North Carolina, USA
| | - Jessica S Hoane
- Charles River Laboratories, Pathology Associates, Durham, North Carolina, USA
| | | | - Rachel Peters
- Takeda Pharmaceuticals International Co., Cambridge, Massachusetts, USA
| | | | - Bhanu P Singh
- Janssen Research & Development, Spring House, Pennsylvania, USA
| | - Kathleen A Szabo
- Charles River Laboratories, Pathology Associates, Durham, North Carolina, USA
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14
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Surh I, Rao DB, Cesta MF, Hébert CD, Mann JF, Cunny H, Kissling GE, Malarkey D, Chhabra RS. Species and gender differences in the carcinogenic activity of trimethylolpropane triacrylate in rats and mice. Food Chem Toxicol 2014; 66:254-61. [PMID: 24503412 DOI: 10.1016/j.fct.2014.01.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 01/27/2014] [Accepted: 01/28/2014] [Indexed: 11/28/2022]
Abstract
Trimethylolpropane triacrylate (TMPTA) is a multifunctional monomer with industrial applications. To determine the carcinogenic potential, male and female F344/N rats and B6C3F1/N mice were administered TMPTA (0, 0.3, 1.0, or 3.0mg/kg) in acetone dermally for 2 years. There were no differences in the body weights and survival in the treated animals compared to controls. Nonneoplastic skin lesions at the site of application included epidermal hyperplasia and hyperkeratosis in both rats and mice. There were no incidences of tumors at the site of application in rats and mice. Rare malignant liver neoplasms were observed in female mice that included hepatoblastoma in the 0.3 and 3.0mg/kg groups, and hepatocholangiocarcinoma in the 1.0 and 3.0mg/kg groups. The incidences of uterine stromal polyp and stromal polyp or stromal sarcoma (combined) in female mice occurred with positive trends and the incidences were significantly increased in the 3.0mg/kg group. A marginal increase in the incidences of malignant mesothelioma in male rats may have been related to TMPTA treatment. In conclusion, our studies show that TMPTA is a dermal irritant in both rats and mice of either sex. Increased incidences of tumor formation were observed in female mice and male rats.
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Affiliation(s)
- Inok Surh
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA.
| | - Deepa B Rao
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA; Integrated Laboratory Systems, Inc., Research Triangle Park, NC 27709, USA
| | - Mark F Cesta
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | | | - Jill F Mann
- Southern Research Institute, Birmingham, AL 35255, USA
| | - Helen Cunny
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Grace E Kissling
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - David Malarkey
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Rajendra S Chhabra
- National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
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15
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Elmore SA, Boyle MC, Boyle MH, Cora MC, Crabbs TA, Cummings CA, Gruebbel MM, Johnson CL, Malarkey DE, McInnes EF, Nolte T, Shackelford CC, Ward JM. Proceedings of the 2013 National Toxicology Program Satellite Symposium. Toxicol Pathol 2013; 42:12-44. [PMID: 24334674 DOI: 10.1177/0192623313508020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The 2013 annual National Toxicology Program (NTP) Satellite Symposium, entitled "Pathology Potpourri," was held in Portland, Oregon, in advance of the Society of Toxicologic Pathology's 32nd annual meeting. The goal of the NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers' presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting and discussion. Some lesions and topics covered during the symposium included a caudal tail vertebra duplication in mice; nephroblastematosis in rats; ectopic C cell tumor in a hamster; granular cell aggregates/tumor in the uterus of a hamster; Pneumocystis carinii in the lung of a rat; iatrogenic chronic inflammation in the lungs of control rats; hepatoblastoma arising within an adenoma in a mouse; humoral hypercalcemia of benignancy in a transgenic mouse; acetaminophen-induced hepatotoxicity in rats; electron microscopy images of iatrogenic intraerythrocytic inclusions in transgenic mice; questionable hepatocellular degeneration/cell death/artifact in rats; atypical endometrial hyperplasia in rats; malignant mixed Müllerian tumors/carcinosarcomas in rats; differential diagnoses of proliferative lesions of the intestine of rodents; and finally obstructive nephropathy caused by melamine poisoning in a rat.
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Affiliation(s)
- Susan A Elmore
- 1National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
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16
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Elmore SA, Hoenerhoff M, Katsuta O, Kokoshima H, Maronpot R, Nagai H, Satoh H, Tanaka Y, Tochitani T, Tsuchiya S, Yoshizawa K. Proceedings of the 2013 Joint JSTP/NTP Satellite Symposium. J Toxicol Pathol 2013; 26:231-57. [PMID: 23914068 PMCID: PMC3695348 DOI: 10.1293/tox.26.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Accepted: 04/04/2013] [Indexed: 12/05/2022] Open
Abstract
The first joint Japanese Society of Toxicologic Pathology (JSTP) and National Toxicology
Program (NTP) Satellite Symposium, entitled “Pathology Potpourri,” was held on January
29th at Okura Frontier Hotel in Tsukuba, Ibaraki, Japan, in advance of the
JSTP’s 29th Annual Meeting. The goal of this Symposium was to present current
diagnostic pathology or nomenclature issues to the toxicologic pathology community. This
article presents summaries of the speakers’ presentations, including diagnostic or
nomenclature issues that were presented, select images that were used for audience voting
or discussion, and the voting results. Some lesions and topics covered during the
symposium include: treatment-related atypical hepatocellular foci of cellular alteration
in B6C3F1 mice; purulent ventriculoencephalitis in a young BALB/c mouse; a subcutaneous
malignant schwannoma in a RccHan:WIST rat; spontaneous nasal septum
hyalinosis/eosinophilic substance in B6C3F1 mice; a rare pancreatic ductal cell adenoma in
a young Lewis rat; eosinophilic crystalline pneumonia in a transgenic mouse model; hyaline
glomerulopathy in two female ddY mice; treatment-related intrahepatic erythrocytes in
B6C3F1 mice; treatment-related subendothelial hepatocytes in B6C3F1 mice; spontaneous
thyroid follicular cell vacuolar degeneration in a cynomolgus monkey; congenital hepatic
fibrosis in a 1-year-old cat; a spontaneous adenocarcinoma of the middle ear in a young
Crl:CD(SD) rat; and finally a series of cases illustrating some differences between
cholangiofibrosis and cholangiocarcinoma in Sprague Dawley and F344 rats.
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Affiliation(s)
- Susan A Elmore
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, 111 T.W. Alexander Drive, Research Triangle Park, North Carolina 27709, USA
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17
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Elmore SA, Berridge BR, Boyle MC, Cora MC, Hoenerhoff MJ, Kooistra L, Laast VA, Morrison JP, Rao D, Rinke M, Yoshizawa K. Proceedings of the 2012 National Toxicology Program Satellite Symposium. Toxicol Pathol 2013; 41:151-80. [PMID: 23262640 PMCID: PMC4195569 DOI: 10.1177/0192623312467102] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The 2012 annual National Toxicology Program (NTP) Satellite Symposium, entitled "Pathology Potpourri," was held in Boston in advance of the Society of Toxicologic Pathology's 31st annual meeting. The goal of the NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers' presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting or discussion. Some lesions and topics covered during the symposium include eosinophilic crystalline pneumonia in a transgenic mouse model; differentiating adrenal cortical cystic degeneration from adenoma; atypical eosinophilic foci of altered hepatocytes; differentiating cardiac schwannoma from cardiomyopathy; diagnosis of cardiac papillary muscle lesions; intrahepatocytic erythrocytes and venous subendothelial hepatocytes; lesions in Rathke's cleft and pars distalis; pernicious anemia and megaloblastic disorders; embryonic neuroepithelial dysplasia, holoprosencephaly and exencephaly; and INHAND nomenclature for select cardiovascular lesions.
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Affiliation(s)
- Susan A Elmore
- National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA.
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18
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Accidental exposure to polychlorinated biphenyls (PCB) in waste cargo after heavy seas. Global waste transport as a source of PCB exposure. Int Arch Occup Environ Health 2013; 87:125-35. [DOI: 10.1007/s00420-012-0841-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 12/13/2012] [Indexed: 10/27/2022]
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19
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Schafer KA, Render JA. Toxicologic Pathology of the Eye: Alterations of the Lens and Posterior Segment. ASSESSING OCULAR TOXICOLOGY IN LABORATORY ANIMALS 2012. [DOI: 10.1007/978-1-62703-164-6_6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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20
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Boorman G, Crabbs TA, Kolenda-Roberts H, Latimer K, Miller AD, Muravnick KB, Nyska A, Ochoa R, Pardo ID, Ramot Y, Rao DB, Schuh J, Suttie A, Travlos GS, Ward JM, Wolf JC, Elmore SA. Proceedings of the 2011 National Toxicology Program Satellite Symposium. Toxicol Pathol 2011; 40:321-44. [PMID: 22089839 DOI: 10.1177/0192623311427713] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The 2011 annual National Toxicology Program (NTP) Satellite Symposium, entitled "Pathology Potpourri," was held in Denver, Colorado in advance of the Society of Toxicologic Pathology's 30th Annual Meeting. The goal of the NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers' presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting or discussion. Some lesions and topics covered during the symposium include: proliferative lesions from various fish species including ameloblastoma, gas gland hyperplasia, nodular regenerative hepatocellular hyperplasia, and malignant granulosa cell tumor; spontaneous cystic hyperplasia in the stomach of CD1 mice and histiocytic aggregates in the duodenal villous tips of treated mice; an olfactory neuroblastoma in a cynomolgus monkey; various rodent skin lesions, including follicular parakeratotic hyperkeratosis, adnexal degeneration, and epithelial intracytoplasmic accumulations; oligodendroglioma and microgliomas in rats; a diagnostically challenging microcytic, hypochromic, responsive anemia in rats; a review of microcytes and microcytosis; nasal lesions associated with green tea extract and Ginkgo biloba in rats; corneal dystrophy in Dutch belted rabbits; valvulopathy in rats; and lymphoproliferative disease in a cynomolgus monkey.
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Affiliation(s)
- Gary Boorman
- Covance Laboratories, Inc., Chantilly, Virginia, USA
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21
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Kouchi M, Toyosawa K, Matsumoto I, Michimae Y, Tochitani T, Koujitani T, Okimoto K, Funabashi H, Seki T. Hyaline glomerulopathy with tubulo-fibrillary deposits in young ddY mice. Toxicol Pathol 2011; 39:975-9. [PMID: 21878553 DOI: 10.1177/0192623311416260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Hyaline glomerulopathy with tubulo-fibrillary deposits was observed in two young female ddY mice. One of the mice showed gross systemic edema and bilateral enlargement and pale color of the kidneys, whereas no significant gross findings were noted in the other mouse. Microscopically, a large number of the glomeruli in both mice were enlarged because of diffuse and global deposition of amorphous eosinophilic materials. The deposits were negatively stained with Congo red and positively stained with IgG, IgM, IgA, C3, and periodic acid-Schiff. Electron microscopic examination revealed microtubular and fibrillary deposits with diameters of 80-100 and 9-16 nm, respectively, in the subendothelial space of the glomeruli. These features are histopathologically similar to immunotactoid glomerulopathy or fibrillary glomerulonephritis according to the classification of human glomerular lesions. Understanding of these characteristics of hyaline glomerulopathy in ddY mice is essential when evaluating pharmacological, pharmacokinetic, and toxicological studies using this mouse strain.
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Affiliation(s)
- Mami Kouchi
- Safety Research Laboratories, Dainippon Sumitomo Pharma Co Ltd, Osaka, Japan
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