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Archer KR, Waeschenbach A, Griffin C, Payne IL, Houston J, Littlewood DTJ, Rich AF. Fatal Hymenolepis nana-associated visceral larva migrans in captive juvenile white-tailed antsangies (Brachytarsomysalbicauda). J Comp Pathol 2024; 212:32-41. [PMID: 38971022 DOI: 10.1016/j.jcpa.2024.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/30/2024] [Accepted: 05/28/2024] [Indexed: 07/08/2024]
Abstract
White-tailed antsangies (Brachytarsomys albicauda) are Madagascan rodents uncommonly kept in captivity. Hymenolepis nana is a cestode with an unusual life cycle, incorporating direct, indirect and autoinfective stages. This case series represents the first reported outbreak of H. nana cestodiasis in white-tailed antsangies, summarizing macroscopic and histological findings in four cases. On post-mortem examination (PME), numerous cysticerci were detected consistently throughout the intestinal serosa, liver, mesenteric lymphatic vasculature and mesenteric lymph nodes. Pancreatic cysticerci were observed in one case. Adult tapeworms, larvae and eggs were found only in the small intestine, and faecal egg shedding was a feature. Histopathological examination identified adult, larval and encysted cestodes within the respective gross lesions, with pulmonary, pancreatic and splenic involvement detected in a single case. The cestodes sampled on PME were identified by polymerase chain reaction and DNA sequencing, with H. nana confirmed in all cases. Visceral larva migrans was consistent throughout all specimens, in contrast with the natural infections of standard rodent hosts, and may be considered a likely pathological feature of H. nana infection in white-tailed antsangies.
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Affiliation(s)
- Karen R Archer
- International Zoo Veterinary Group, Station House, Parkwood Street, Keighley BD21 4NQ, UK
| | | | - Claire Griffin
- Science, Natural History Museum, Cromwell Road, London SW7 5BD, UK
| | - Imogen L Payne
- Holly House Veterinary Hospital, 468 Street Lane, Moortown, Leeds LS17 6HA, UK
| | - Johnpaul Houston
- PO Box 110 University, Port Moresby Nature Park, Goro-Kaeaga Road, Port Moresby National Capital District, Papua New Guinea
| | | | - Andrew F Rich
- International Zoo Veterinary Group, Station House, Parkwood Street, Keighley BD21 4NQ, UK.
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2
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Sancho-Albero M, Sebastian V, Perez-Lopez AM, Martin-Duque P, Unciti-Broceta A, Santamaria J. Extracellular Vesicles-Mediated Bio-Orthogonal Catalysis in Growing Tumors. Cells 2024; 13:691. [PMID: 38667306 PMCID: PMC11048864 DOI: 10.3390/cells13080691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/10/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
Several studies have reported the successful use of bio-orthogonal catalyst nanoparticles (NPs) for cancer therapy. However, the delivery of the catalysts to the target tissues in vivo remains an unsolved challenge. The combination of catalytic NPs with extracellular vesicles (EVs) has been proposed as a promising approach to improve the delivery of therapeutic nanomaterials to the desired organs. In this study, we have developed a nanoscale bio-hybrid vector using a CO-mediated reduction at low temperature to generate ultrathin catalytic Pd nanosheets (PdNSs) as catalysts directly inside cancer-derived EVs. We have also compared their biodistribution with that of PEGylated PdNSs delivered by the EPR effect. Our results indicate that the accumulation of PdNSs in the tumour tissue was significantly higher when they were administered within the EVs compared to the PEGylated PdNSs. Conversely, the amount of Pd found in non-target organs (i.e., liver) was lowered. Once the Pd-based catalytic EVs were accumulated in the tumours, they enabled the activation of a paclitaxel prodrug demonstrating their ability to carry out bio-orthogonal uncaging chemistries in vivo for cancer therapy.
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Affiliation(s)
- Maria Sancho-Albero
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Avda. San Juan Bosco, 13, 50009 Zaragoza, Spain; (V.S.); (J.S.)
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Campus Rio Ebro, Edificio I+D, C/Poeta Mariano Esquillor, s/n, 50018 Zaragoza, Spain
- Networking Research Center in Biomaterials, Bioengineering and Nanomedicine (CIBERBBN), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Department of Chemical and Enviromental Engineering, University of Zaragoza, Campus Rio Ebro, C/María de Luna, 3, 50018 Zaragoza, Spain
| | - Victor Sebastian
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Avda. San Juan Bosco, 13, 50009 Zaragoza, Spain; (V.S.); (J.S.)
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Campus Rio Ebro, Edificio I+D, C/Poeta Mariano Esquillor, s/n, 50018 Zaragoza, Spain
- Networking Research Center in Biomaterials, Bioengineering and Nanomedicine (CIBERBBN), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Department of Chemical and Enviromental Engineering, University of Zaragoza, Campus Rio Ebro, C/María de Luna, 3, 50018 Zaragoza, Spain
| | - Ana M. Perez-Lopez
- Edinburgh Cancer Research, CRUK Scotland Centre, Institute of Genetics & Cancer, University of Edinburgh, Edinburgh EH4 2XR, UK; (A.M.P.-L.); (A.U.-B.)
| | - Pilar Martin-Duque
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Avda. San Juan Bosco, 13, 50009 Zaragoza, Spain; (V.S.); (J.S.)
- Networking Research Center in Biomaterials, Bioengineering and Nanomedicine (CIBERBBN), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Instituto de Salud Carlos III, 28222 Madrid, Spain
| | - Asier Unciti-Broceta
- Edinburgh Cancer Research, CRUK Scotland Centre, Institute of Genetics & Cancer, University of Edinburgh, Edinburgh EH4 2XR, UK; (A.M.P.-L.); (A.U.-B.)
| | - Jesus Santamaria
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Avda. San Juan Bosco, 13, 50009 Zaragoza, Spain; (V.S.); (J.S.)
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Campus Rio Ebro, Edificio I+D, C/Poeta Mariano Esquillor, s/n, 50018 Zaragoza, Spain
- Networking Research Center in Biomaterials, Bioengineering and Nanomedicine (CIBERBBN), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Department of Chemical and Enviromental Engineering, University of Zaragoza, Campus Rio Ebro, C/María de Luna, 3, 50018 Zaragoza, Spain
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3
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Robledo DAR, Prudente MS, Aguja SE, Iwata H. A meta-analysis of randomized controlled studies on the hepatoxicity induced by polybrominated diphenyl ethers (PBDEs) in rats and mice. Curr Res Toxicol 2023; 5:100131. [PMID: 37841056 PMCID: PMC10570958 DOI: 10.1016/j.crtox.2023.100131] [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: 05/23/2023] [Revised: 09/09/2023] [Accepted: 10/02/2023] [Indexed: 10/17/2023] Open
Abstract
Several toxicological studies were conducted to evaluate the hepatoxicity of PBDEs using different animal models, congeners, duration of exposure, and other parameters. These variations in different animal models and conditions might have an impact on extrapolating experimental results to humans. Hence, by the meta-analysis, we aimed to clarify and elucidate the species differences in hepatoxicity induced by PBDE exposure in rats and mice across different conditions and moderators. Fourteen in vivo studies that utilized rats and mice models were identified, and data such as author names, year of publication, type of PBDE congeners, rodent species, life stage of exposure, dosage, duration, and hepatoxicity indicators were extracted. The pooled standard mean difference (SMD) with a 95% confidence interval (95% CI) was used to evaluate the association between hepatoxicity and PBDE exposure across multiple approaches of measurement. Subgroup analysis, meta-regression, and interaction analysis were utilized to elucidate the species-related differences among the results of the involved studies. The pooled SMD of hepatoxicity of PBDE exposure in the involved in vivo studies was 1.82 (p = 0.016), indicating exposure to PBDE congeners and mixtures is associated with a significant increase in liver toxicity in rodents. Moreover, findings showed that rats were more sensitive to PBDEs than mice with the BDE-209 had the highest SMD value. Among the life stages of exposure, embryonic stage was found to be the most sensitive to hepatoxicity induced by PBDE congeners. Positive relationships were found between the incidence of hepatoxicity with dosage and duration of exposure to PBDE. Interaction analyses showed significant interactions between rodent species (rats or mice), dosage, length of exposure, and hepatotoxicity endpoints. Rats demonstrated an increased susceptibility to variations in organ weight, histopathological changes, mitochondrial dysfunction, and oxidative stress markers. Conversely, mice showed pronounced lipid accumulation and modifications in liver enzyme expression levels. However, significant differences were not found in terms of endoplasmic reticular stress as a mechanistic endpoint for hepatotoxicity. In conclusion, this meta-analysis showed that there might be some species-related differences in hepatoxicity induced by PBDE exposure in rats and mice depending on the parameters used. This study highlights the importance of cross-species extrapolation of results from animal models to accurately assess the potential risks to human health from exposure to PBDEs.
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Affiliation(s)
- Dave Arthur R. Robledo
- Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
| | | | | | - Hisato Iwata
- Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
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O'Donnell BL, Sanchez-Pupo RE, Sayedyahossein S, Karimi M, Bahmani M, Zhang C, Johnston D, Kelly JJ, Wakefield CB, Barr K, Dagnino L, Penuela S. Pannexin 3 channels regulate architecture, adhesion, barrier function and inflammation in the skin. J Invest Dermatol 2023:S0022-202X(23)00103-3. [PMID: 36813158 DOI: 10.1016/j.jid.2023.01.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 12/19/2022] [Accepted: 01/20/2023] [Indexed: 02/24/2023]
Abstract
The channel-forming glycoprotein Pannexin 3 (PANX3) functions in cutaneous wound healing and keratinocyte differentiation, but its role in skin homeostasis through aging is not yet understood. We found that PANX3 is absent in newborn skin but becomes upregulated with age. We characterized the skin of global Panx3 knockout mice (KO) and found that KO dorsal skin showed sex-differences at different ages, but generally had reduced dermal and hypodermal areas compared to aged-matched controls. Transcriptomic analysis of KO epidermis revealed reduced E-cadherin stabilization and Wnt signaling compared to WT, consistent with the inability of primary KO keratinocytes to adhere in culture, and diminished epidermal barrier function in KO mice. We also observed increased inflammatory signaling in KO epidermis and higher incidence of dermatitis in aged KO mice compared to wildtype controls. These findings suggest that during skin aging, PANX3 is critical in the maintenance of dorsal skin architecture, keratinocyte cell-cell and cell-matrix adhesion and inflammatory skin responses.
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Affiliation(s)
- Brooke L O'Donnell
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Rafael E Sanchez-Pupo
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Samar Sayedyahossein
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Mehdi Karimi
- Department of Mathematics, Illinois State University, Normal, Illinois, United States, 61790
| | | | - Christopher Zhang
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Danielle Johnston
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - John J Kelly
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - C Brent Wakefield
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1.; Western's Bone and Joint Institute, The Dr. Sandy Kirkley Centre for Musculoskeletal Research, University Hospital, London, Ontario, Canada, N6G 2V4
| | - Kevin Barr
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Lina Dagnino
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1
| | - Silvia Penuela
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1.; Western's Bone and Joint Institute, The Dr. Sandy Kirkley Centre for Musculoskeletal Research, University Hospital, London, Ontario, Canada, N6G 2V4; Department of Oncology, Division of Experimental Oncology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1.
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5
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Ameliorative and Renoprotective Effect of Electrical Stimulation on Blood Sugar, Blood Urea Nitrogen (BUN), Creatinine Levels, and the Islets of Langerhans Weight in Diabetic Mice. Vet Med Int 2022; 2022:7922892. [DOI: 10.1155/2022/7922892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 11/01/2022] [Accepted: 11/05/2022] [Indexed: 11/27/2022] Open
Abstract
Diabetes mellitus (DM) is a chronic metabolic disease or disorder characterized by high blood sugar levels as well as impaired carbohydrate, lipid, and protein metabolism due to insulin function insufficiency. Insulin deficiency can be caused by impaired or deficient insulin production by Langerhans beta cells in the pancreas or by a lack of responsiveness of the body's cells to insulin. This study aims to the effects of electrostimulation on the ameliorative (improves disease manifestations) or renoprotective (protects the kidneys) in a diabetic rat model using noninvasive (electrical stimulation with the magnetic and nonmagnetic electrode) and invasive (using needles) methods. This study used 25 female rats, with a normal control group (KN), a diabetes control group (KD), a needle treatment group (A), an electro-stimulator treatment group with a magnetic electrode (M), and an ES group with a nonmagnetic electrode (ES) (L). The electro-stimulator used AES-05 with a magnetic field strength of 90 mT at two acupoints, Pishu (BL20) and Shenshu (BL23). The treatment was administered 12 times in one month with a therapy time of 6.6 minutes per session. Body weight and blood sugar levels were compared before and after the treatment. After treatment, the diameter of the islets of Langerhans, as well as levels of creatinine and blood urea nitrogen (BUN), was measured. Furthermore, statistical analysis was performed (α = 0.05). The results of this study showed that electrical stimulation treatments with needle-invasive, noninvasive magnetic electrodes, and nonmagnetic electrodes significantly reduced diabetic rats’ blood glucose levels before and after the treatment. The analysis of the diameter of the islets of Langerhans revealed a significant difference between the treatment groups. The analysis of creatinine levels revealed a significant difference between groups, but creatinine levels in the group with the magnetic electrode (0.58 ± 0.17 mg/dL) were not significantly different from the control group (0.58 ± 0.07 mg/dL). The BUN test results revealed a significant difference compared with the diabetic control group, but no significant difference with the magnetic electrode treatment group. Conclusion. Based on the results, the most effective therapy for diabetes is a noninvasive method with magnetic (M) electrodes.
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6
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Brütting C, Hildebrand P, Brandsch C, Stangl GI. Ability of dietary factors to affect homocysteine levels in mice: a review. Nutr Metab (Lond) 2021; 18:68. [PMID: 34193183 PMCID: PMC8243555 DOI: 10.1186/s12986-021-00594-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/14/2021] [Indexed: 01/10/2023] Open
Abstract
Homocysteine is associated with several diseases, and a series of dietary factors are known to modulate homocysteine levels. As mice are often used as model organisms to study the effects of dietary hyperhomocysteinemia, we collected data about concentrations of vitamin B12, vitamin B6, folate, methionine, cystine, and choline in mouse diets and the associated plasma/serum homocysteine levels. In addition, we more closely examined the composition of the control diet, the impact of the mouse strain, sex and age, and the duration of the dietary intervention on homocysteine levels. In total, 113 out of 1103 reviewed articles met the inclusion criteria. In the experimental and control diets, homocysteine levels varied from 0.1 to 280 µmol/l. We found negative correlations between dietary vitamin B12 (rho = − 0.125; p < 0.05), vitamin B6 (rho = − 0.191; p < 0.01) and folate (rho = − 0.395; p < 0.001) and circulating levels of homocysteine. In contrast, a positive correlation was observed between dietary methionine and homocysteine (methionine: rho = 0.146; p < 0.05). No significant correlations were found for cystine or choline and homocysteine levels. In addition, there was no correlation between the duration of the experimental diets and homocysteine levels. More importantly, the data showed that homocysteine levels varied widely in mice fed control diets as well. When comparing control diets with similar nutrient concentrations (AIN-based), there were significant differences in homocysteine levels caused by the strain (ANOVA, p < 0.05) and age of the mice at baseline (r = 0.47; p < 0.05). When comparing homocysteine levels and sex, female mice tended to have higher homocysteine levels than male mice (9.3 ± 5.9 µmol/l vs. 5.8 ± 4.5 µmol/l; p = 0.069). To conclude, diets low in vitamin B12, vitamin B6, or folate and rich in methionine are similarly effective in increasing homocysteine levels. AIN recommendations for control diets are adequate with respect to the amounts of homocysteine-modulating dietary parameters. In addition, the mouse strain and the age of mice can affect the homocysteine level.
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Affiliation(s)
- Christine Brütting
- Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, 06120, Halle (Saale), Germany.
| | - Pia Hildebrand
- Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, 06120, Halle (Saale), Germany
| | - Corinna Brandsch
- Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, 06120, Halle (Saale), Germany
| | - Gabriele I Stangl
- Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 2, 06120, Halle (Saale), Germany
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7
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Adhikary S, Bisgaard M, Dagnæs-Hansen F, Christensen H. Clonal outbreaks of [ Pasteurella] pneumotropica biovar Heyl in two mouse colonies. Lab Anim 2017; 51:613-621. [PMID: 28358244 DOI: 10.1177/0023677217698503] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this study was to document the pathogenic role of biovar Heyl of [ Pasteurella] pneumotropica in mouse colonies. Fifty-three isolates associated with mastitis and orbital, cutaneous and vaginal abscesses as well as isolates from the nose and vagina of healthy mice were investigated. According to phenotypic characteristics and rpoB sequencing, the isolates were identified as [ P.] pneumotropica biovar Heyl. Pulsed-field gel electrophoresis (PFGE) revealed five closely related profiles separated by only one to four fragments. The outbreak strains diverged from epidemiologically unrelated strains with the same rpoB sequence type, as shown by the PFGE profiles. The investigation documented that members of biovar Heyl of [ P.] pneumotropica caused disease outbreaks in mouse colonies since the clonality indicated a primary role of [ P.] pneumotropica biovar Heyl in the infections observed.
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Affiliation(s)
- Sadhana Adhikary
- 1 Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | | | | | - Henrik Christensen
- 1 Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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8
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Takagi T, Ohsawa M, Yamanaka H, Matsuda N, Sato H, Ohsawa K. Difference of two new LCMV strains in lethality and viral genome load in tissues. Exp Anim 2017; 66:199-208. [PMID: 28260717 PMCID: PMC5543240 DOI: 10.1538/expanim.16-0097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
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. Strain OQ28 (OQ28) infected
mice exhibited clinical signs and lethality, whereas strain BRC (BRC) infected mice showed
no clinical signs of infection. The viral genome load in tissues of C57BL/6 mice infected
with two strains was determined using one-step real time RT-PCR. In C57BL/6 mice, higher
levels of OQ28 viral genome load were detected in all tissues rather than were present in
BRC infected mice. The viral genome load in lungs of both virus strains remained higher
levels than in other tissues at 28 days post infection. Comparing sequences of the three
LCMV epitope peptide regions revealed one non-conservative amino acid substitution codon
in OQ28 and two amino acid differences in BRC. These results suggest that the varied
pathogenicity and viral genome load of LCMV strains are not based only on differences in
the host MHC class I molecule.
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Affiliation(s)
- Toshikazu Takagi
- Division of Comparative Medicine, Center for Frontier Life Sciences, Nagasaki University Graduate School of Biomedical Sciences, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan.,Quality Control Department, Bio Technical Center, Japan SLC, Inc., 3-5-1 Aoihigashi, Naka, Hamamatsu, Shizuoka 433-8114, Japan
| | - Makiko Ohsawa
- Division of Comparative Medicine, Center for Frontier Life Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan
| | - Hitoki Yamanaka
- Division of Comparative Medicine, Center for Frontier Life Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan
| | - Naoki Matsuda
- Division of Radiation Biology and Protection, Center for Frontier Life Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan
| | - Hiroshi Sato
- Division of Comparative Medicine, Center for Frontier Life Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan.,National Institute for Physiological Sciences, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Kazutaka Ohsawa
- Division of Comparative Medicine, Center for Frontier Life Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8523, Japan
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9
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Woods SE, Leonard MR, Hayden JA, Brophy MB, Bernert KR, Lavoie B, Muthupalani S, Whary MT, Mawe GM, Nolan EM, Carey MC, Fox JG. Impaired cholecystokinin-induced gallbladder emptying incriminated in spontaneous "black" pigment gallstone formation in germfree Swiss Webster mice. Am J Physiol Gastrointest Liver Physiol 2015; 308:G335-49. [PMID: 25477375 PMCID: PMC4329474 DOI: 10.1152/ajpgi.00314.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
"Black" pigment gallstones form in sterile gallbladder bile in the presence of excess bilirubin conjugates ("hyperbilirubinbilia") from ineffective erythropoiesis, hemolysis, or induced enterohepatic cycling (EHC) of unconjugated bilirubin. Impaired gallbladder motility is a less well-studied risk factor. We evaluated the spontaneous occurrence of gallstones in adult germfree (GF) and conventionally housed specific pathogen-free (SPF) Swiss Webster (SW) mice. GF SW mice were more likely to have gallstones than SPF SW mice, with 75% and 23% prevalence, respectively. In GF SW mice, gallstones were observed predominately in heavier, older females. Gallbladders of GF SW mice were markedly enlarged, contained sterile black gallstones composed of calcium bilirubinate and <1% cholesterol, and had low-grade inflammation, edema, and epithelial hyperplasia. Hemograms were normal, but serum cholesterol was elevated in GF compared with SPF SW mice, and serum glucose levels were positively related to increasing age. Aged GF and SPF SW mice had deficits in gallbladder smooth muscle activity. In response to cholecystokinin (CCK), gallbladders of fasted GF SW mice showed impaired emptying (females: 29%; males: 1% emptying), whereas SPF SW females and males emptied 89% and 53% of volume, respectively. Bilirubin secretion rates of GF SW mice were not greater than SPF SW mice, repudiating an induced EHC. Gallstones likely developed in GF SW mice because of gallbladder hypomotility, enabled by features of GF physiology, including decreased intestinal CCK concentration and delayed intestinal transit, as well as an apparent genetic predisposition of the SW stock. GF SW mice may provide a valuable model to study gallbladder stasis as a cause of black pigment gallstones.
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Affiliation(s)
- Stephanie E. Woods
- 1Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts;
| | - Monika R. Leonard
- 2Division of Gastroenterology, Brigham and Women's Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts;
| | - Joshua A. Hayden
- 3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts; and
| | - Megan Brunjes Brophy
- 3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts; and
| | - Kara R. Bernert
- 2Division of Gastroenterology, Brigham and Women's Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts;
| | - Brigitte Lavoie
- 4Department of Neurological Sciences, University of Vermont, Burlington, Vermont
| | - Sureshkumar Muthupalani
- 1Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts;
| | - Mark T. Whary
- 1Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts;
| | - Gary M. Mawe
- 4Department of Neurological Sciences, University of Vermont, Burlington, Vermont
| | - Elizabeth M. Nolan
- 3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts; and
| | - Martin C. Carey
- 2Division of Gastroenterology, Brigham and Women's Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts;
| | - James G. Fox
- 1Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts;
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10
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Sagaya FM, Hacin B, Tompa G, Ihan A, Špela Š, Černe M, Hurrell RF, Matijašić BB, Rogelj I, Vergères G. Lactobacillus gasseri K7 modulates the blood cell transcriptome of conventional mice infected with Escherichia coli O157:H7. J Appl Microbiol 2014; 116:1282-96. [PMID: 24779582 DOI: 10.1111/jam.12440] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 12/31/2013] [Accepted: 01/02/2014] [Indexed: 01/30/2023]
Abstract
AIMS As the immune cells underlying the intestinal barrier sense luminal microbial signals, blood cell transcriptomics may identify subclinical changes triggered by gut bacteria that may otherwise not be detected. We have therefore investigated how Lactobacillus gasseri K7 and enterohemorrhagic Escherichia coli O157:H7 modulate the blood cell transcriptome of mice possessing an intact microbiota. METHODS AND RESULTS We have analysed the transcriptome of five groups of C57BL/6J mice: (i) control, (ii) inoculated with a single dose of E. coli, (iii) inoculated during 2 weeks with Lact. gasseri, (iv) co-inoculated with E. coli and Lact. gasseri, (v) inoculated with Lact. gasseri prior to E. coli infection. The transcriptome could distinguish between the five treatment groups. Gene characteristics of bacterial infection, in particular inflammation, were upregulated in the mice inoculated with E. coli. Lact. gasseri had only mild effects on the transcriptome but modified the gene expression induced by E. coli. CONCLUSIONS The transcriptome differentiates mice inoculated orally with E. coli, Lact. gasseri and combinations of these two strains. SIGNIFICANCE AND IMPACT OF THE STUDY These results suggest that the blood cell transcriptome can be used as a source of biomarkers to monitor the impact of probiotics in subclinical models of infectious disease.
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Affiliation(s)
- F M Sagaya
- Institute of Food Science, Agroscope, Berne, Switzerland; Institute of Food Nutrition and Health, ETH Zurich, Zürich, Switzerland
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11
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Zanni PC, Negri M, Salci TP, Bonfim-Mendonça PDS, Kioshima ES, Svidzinski TI, Consolaro ME. Animal models for the effective development of atrophic vaginitis therapies: possibilities and limitations. Expert Opin Drug Discov 2014; 9:269-81. [PMID: 24397873 DOI: 10.1517/17460441.2014.877883] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Vaginal atrophy (VA) is an inflammation of the vagina that develops when there is a significant decrease in levels of the estrogen. Prolonged periods of hypoestrogenism may induce severe VA and treatment is essential. This is a significant problem which requires more focused attention for the development of existing and future therapies. AREAS COVERED This review evaluates the suitable animal models of VA, including: mice, rodents and non-human primates. It focuses particularly on the possibilities and limitations of these in vivo models for the effective development of VA therapies. EXPERT OPINION Hormone replacement therapy (HRT) has been prescribed and successfully used for VA. However, some studies have shown that HRT may be linked to an increased risk of breast cancer, coronary heart diseases and others risks. Thus, there is a growing interest in effective and safe alternatives to VA symptoms. There are, however, a number of things that must be considered for future drug discovery efforts. One major consideration is what animal model should be used and whether the model is appropriate for the study aim. Similarly, research studies must also consider the influencing factors on these animal models, so that these models can effectively mimic the actual disease. The authors also highlight the need to standardize research parameters to produce more reliable and reproducible data.
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Affiliation(s)
- Pamela Cmd Zanni
- State University of Maringá, Department of Clinical Analysis and Biomedicine , Maringá , Brazil
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12
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Effects of housing density on nasal pathology of breeding mice housed in individually ventilated cages. Lab Anim (NY) 2012; 41:68-76. [PMID: 22343459 DOI: 10.1038/laban0312-68] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 10/13/2011] [Indexed: 11/08/2022]
Abstract
The 2011 edition of the Guide for the Care and Use of Laboratory Animals includes new recommendations for the amount of floor space that should be provided to breeding mice. When pairs or trios of continuously breeding mice are housed in shoebox cages, they may have less than this recommended amount of floor space. High housing densities may adversely affect animal health, for example, by compromising air quality inside the cage. Hence, some institutions are carefully reevaluating the microenvironments of breeding cages. The use of individually ventilated cages (IVCs) to house research mice allows for greater control over the quality of the cage microenvironment. The authors evaluated the microenvironments of shoebox cages in an IVC rack system housing breeding and non-breeding Swiss Webster mice. Ammonia concentrations were significantly higher in cages housing breeding trios with two litters. Histopathologic lesions attributable to inhaled irritants such as ammonia were found in mice housed in breeding pairs and trios. The authors conclude that the microenvironments of cages in an IVC rack system housing breeding pairs and trios may be detrimental to animal health.
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13
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Kawamoto E, Sasaki H, Okiyama E, Kanai T, Ueshiba H, Ohnishi N, Sawada T, Hayashimoto N, Takakura A, Itoh T. Pathogenicity of Pasteurella pneumotropica in immunodeficient NOD/ShiJic-scid/Jcl and immunocompetent Crlj:CD1 (ICR) mice. Exp Anim 2012; 60:463-70. [PMID: 22041283 DOI: 10.1538/expanim.60.463] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Pasteurella pneumotropica is an opportunistic pathogen in rodents. Natural infection in immunodeficient animals suggests that immunodeficiency is a major factor in P. pneumotropica pathogenesis. To understand this process, we performed clinical, pathological and bacteriological studies of immunodeficient NOD/ShiJic-scid/Jcl and immunocompetent Crlj:CD1 (ICR) mice experimentally infected with P. pneumotropica ATCC 35149. From 14 days postinoculation, some of P. pneumotropica-infected NOD/ShiJic-scid/Jcl mice developed clinical signs of weight loss. Three of 10 P. pneumotropica-infected NOD/ShiJic-scid/Jcl mice developed clinical signs of depression, ruffled coat, and weight loss and died at 27, 34, and 59 days postinoculation. At 35 days postinoculation, almost all P. pneumotropica-infected NOD/ShiJic-scid/Jcl mice had lung abscesses. The bacteria were isolated from the upper and lower respiratory tracts, including the lungs, and blood. In contrast, P. pneumotropica-infected ICR mice exhibited no clinical signs or lesions. The bacteria were isolated from the upper, but not the lower respiratory tracts. We developed an animal model for understanding host interactions with P. pneumotropica.
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Affiliation(s)
- Eiichi Kawamoto
- Animal Research Center, Tokyo Medical University, Shinjuku, Tokyo 160-8402, Japan
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14
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Treuting PM, Clifford CB, Sellers RS, Brayton CF. Of mice and microflora: considerations for genetically engineered mice. Vet Pathol 2011; 49:44-63. [PMID: 22173977 DOI: 10.1177/0300985811431446] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The phenotype of genetically engineered mice is a combination of both genetic and environmental factors that include the microflora of the mouse. The impact a particular microbe has on a mouse reflects the host-microbe interaction within the context of the mouse genotype and environment. Although often considered a confounding variable, many host-microbe interactions have resulted in the generation of novel model systems and characterization of new microbial agents. Microbes associated with overt disease in mice have been the historical focus of the laboratory animal medical and pathology community and literature. The advent of genetic engineering and the complex of mouse models have revealed previously unknown or disregarded agents that now oblige the attention of the biomedical research community. The purpose of this article is to describe and illustrate how phenotypes can be affected by microflora by focusing on the infectious diseases present in genetically engineered mouse (GEM) colonies of our collective institutions and by reviewing important agents that are rarely seen in most research facilities today. The goal is to introduce the concept of the role of microflora on phenotypes and in translational research using GEM models.
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Affiliation(s)
- P M Treuting
- Department of Comparative Medicine & Histology and Imaging Core, School of Medicine, University of Washington, T140 Health Science Center, Box 357190, Seattle, WA 98195-7190, USA.
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15
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Rodova M, Lu Q, Li Y, Woodbury BG, Crist JD, Gardner BM, Yost JG, Zhong XB, Anderson HC, Wang J. Nfat1 regulates adult articular chondrocyte function through its age-dependent expression mediated by epigenetic histone methylation. J Bone Miner Res 2011; 26:1974-86. [PMID: 21452283 PMCID: PMC3353550 DOI: 10.1002/jbmr.397] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The development of disease-modifying pharmacologic therapy for osteoarthritis (OA) currently faces major obstacles largely because the regulatory mechanisms for the function of adult articular chondrocytes remain unclear. We previously demonstrated that lack of Nfat1, one of the nuclear factor of activated T cells (NFAT) transcription factors, causes OA-like changes in adult mice. This study aimed to identify whether Nfat1 specifically regulates adult articular chondrocyte function and its age-dependent regulatory mechanism using both Nfat1-deficient and wild-type mice. Deletion of Nfat1 did not induce OA-like articular chondrocyte dysfunction (e.g., overexpression of proinflammatory cytokines and matrix-degrading proteinases) until the adult stage. RNAi-mediated Nfat1 knockdown caused dysfunction of wild-type adult articular chondrocytes. Nfat1 expression in wild-type articular chondrocytes was low in the embryonic but high in the adult stage. Chromatin immunoprecipitation assays demonstrated that an increase in Nfat1 expression in articular chondrocytes was associated with increased H3K4me2 (a histone modification linked to transcriptional activation), whereas a decrease in Nfat1 expression in articular chondrocytes was correlated with increased H3K9me2 (a histone modification linked to transcriptional repression). Knockdown of lysine-specific demethylase-1 (Lsd1) in embryonic articular chondrocytes upregulated Nfat1 expression concomitant with increased H3K4me2 at the Nfat1 promoter. Knockdown of Jmjc-containing histone demethylase-2a (Jhdm2a) in 6-month articular chondrocytes downregulated Nfat1 expression concomitant with increased H3K9me2 at the Nfat1 promoter. These results suggest that Nfat1 is an essential transcriptional regulator of chondrocyte homeostasis in adult articular cartilage. Age-dependent Nfat1 expression in articular chondrocytes is regulated by dynamic histone methylation, one of the epigenetic mechanisms that regulate gene transcription.
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Affiliation(s)
- Marianna Rodova
- Harrington Laboratory for Molecular Orthopedics, Department of Orthopedic Surgery, University of Kansas Medical Center, Kansas City, KS 66160, USA
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16
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Held N, Hedrich HJ, Bleich A. Successful sanitation of an EDIM-infected mouse colony by breeding cessation. Lab Anim 2011; 45:276-9. [PMID: 21402733 DOI: 10.1258/la.2010.010150] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Despite decreasing prevalence, rotavirus infections still rank among the most important viral infections in colonies of laboratory mice. Although the disease is characterized by low mortality and a relatively short and mild clinical period, the infection has the potential to alter the outcome of experiments substantially. For animal facilities, it is therefore essential to eradicate the virus. Here we report a successful sanitation of a rotavirus-infected mouse colony in an animal facility. Despite a high ratio of transgenic and partially immunodeficient strains, a permanent eradication of the virus was achieved by euthanasia of highly susceptible mice, a prolonged breeding cessation in areas containing immunocompromised mice and a strict hygienic management. The management of a rotavirus infection reported here is a feasible and inexpensive opportunity for sanitation that benefits from maintaining most of the animal population, even in today's mouse colonies comprising mainly transgenic mice with unknown or compromised immune status.
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Affiliation(s)
- N Held
- Institute for Laboratory Animal Science, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
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17
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Chapman JL, Nichols DK, Martinez MJ, Raymond JW. Animal models of orthopoxvirus infection. Vet Pathol 2010; 47:852-70. [PMID: 20682806 DOI: 10.1177/0300985810378649] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Smallpox was one of the most devastating diseases known to humanity. Although smallpox was eradicated through a historically successful vaccination campaign, there is concern in the global community that either Variola virus (VARV), the causative agent of smallpox, or another species of Orthopoxvirus could be used as agents of bioterrorism. Therefore, development of countermeasures to Orthopoxvirus infection is a crucial focus in biodefense research, and these efforts rely on the use of various animal models. Smallpox typically presented as a generalized pustular rash with 30 to 40% mortality, and although smallpox-like syndromes can be induced in cynomolgus macaques with VARV, research with this virus is highly restricted; therefore, animal models with other orthopoxviruses have been investigated. Monkeypox virus causes a generalized vesiculopustular rash in rhesus and cynomolgus macaques and induces fatal systemic disease in several rodent species. Ectromelia virus has been extensively studied in mice as a model of orthopoxviral infection in its natural host. Intranasal inoculation of mice with some strains of vaccinia virus produces fatal bronchopneumonia, as does aerosol or intranasal inoculation of mice with cowpox virus. Rabbitpox virus causes pneumonia and fatal systemic infections in rabbits and can be naturally transmitted between rabbits by an aerosol route similar to that of VARV in humans. No single animal model recapitulates all known aspects of human Orthopoxvirus infections, and each model has its advantages and disadvantages. This article provides a brief review of the Orthopoxvirus diseases of humans and the key pathologic features of animal models of Orthopoxvirus infections.
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Affiliation(s)
- J L Chapman
- DVM, Major, US Army, US Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Frederick, MD 21702, USA.
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18
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Treuting PM, Albertson TM, Preston BD. Case series: acute tumor lysis syndrome in mutator mice with disseminated lymphoblastic lymphoma. Toxicol Pathol 2010; 38:476-85. [PMID: 20190201 DOI: 10.1177/0192623310362249] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Acute tumor lysis syndrome (ATLS) is characterized by severe metabolic abnormalities and organ dysfunction resulting from rapid destruction of neoplastic cells. Metabolic disturbances are thought to be the primary cause of clinical ATLS symptoms, which include renal dysfunction, seizures, and cardiac arrhythmias. The histopathologic lesions associated with organ dysfunction are largely unknown because of the low rate of mortality of ATLS in humans and the few cases of ATLS identified in laboratory animals. Here, we describe histologic, immunohistochemical, and electron microscopic analyses of thirty-one ATLS cases from a cohort of 499 mice that are prone to spontaneous lymphoblastic lymphoma owing to genetic defects in DNA replication fidelity. Seventy-three percent of our cohort died with lymphoblastic lymphoma, and 8% of affected mice died with diffuse microthromboemboli consistent with ATLS. Mice with ATLS had a high spontaneous mortality rate (>50%), a large tumor burden with disseminated disease, and evidence of leukemia. Blood vessels in the lung, kidney, and other organs were occluded by microthromboemboli composed of chromatin, cellular debris, fibrin, platelets, and entrapped erythrocytes and malignant cells. This case series suggests that ATLS can occur at high frequency in mice with disseminated lymphoblastic lymphoma and leads to a high rate of spontaneous death from microthromboemboli.
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Affiliation(s)
- Piper M Treuting
- Department of Comparative Medicine, University of Washington, Seattle, WA 98195-7190, USA.
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19
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Wang J, Gardner BM, Lu Q, Rodova M, Woodbury BG, Yost JG, Roby KF, Pinson DM, Tawfik O, Anderson HC. Transcription factor Nfat1 deficiency causes osteoarthritis through dysfunction of adult articular chondrocytes. J Pathol 2009; 219:163-72. [PMID: 19526482 DOI: 10.1002/path.2578] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Osteoarthritis (OA) is the most common form of joint disease in middle-aged and older individuals. Previous studies have shown that over-expression of matrix-degrading proteinases and proinflammatory cytokines is associated with osteoarthritic cartilage degradation. However, it remains unclear which transcription factors regulate the expression of these cartilage-degrading molecules in articular chondrocytes. This study demonstrated that mice lacking Nfat1, a member of the nuclear factor of activated T cells (NFAT) transcription factors, exhibited normal skeletal development but displayed loss of type II collagen (collagen-2) and aggrecan with over-expression of specific matrix-degrading proteinases and proinflammatory cytokines in young adult articular cartilage of load-bearing joints. These initial changes are followed by articular chondrocyte proliferation/clustering, progressive articular surface destruction, periarticular chondro-osteophyte formation and exposure of thickened subchondral bone, all of which resemble human OA. Forced expression of Nfat1 delivered with lentiviral vectors in cultured 3 month-old primary Nfat1 knockout (Nfat1(-/-)) articular chondrocytes partially or completely rescued the abnormal catabolic and anabolic activities of Nfat1(-/-) articular chondrocytes. These new findings revealed a previously unrecognized critical role of Nfat1 in maintaining the physiological function of differentiated adult articular chondrocytes through regulating the expression of specific matrix-degrading proteinases and proinflammatory cytokines. Nfat1 deficiency causes OA due to an imbalance between the catabolic and anabolic activities of adult articular chondrocytes, leading to articular cartilage degradation and failed repair activities in and around articular cartilage. These results may provide new insights into the aetiology, pathogenesis and potential therapeutic strategies for osteoarthritis.
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Affiliation(s)
- Jinxi Wang
- Department of Orthopedic Surgery, University of Kansas Medical Center, Kansas City, 66160, USA.
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20
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Effects of a fire alarm strobe light on fecal corticosterone metabolite concentrations in mice. Lab Anim (NY) 2009; 38:61-8. [DOI: 10.1038/laban0209-61] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 11/05/2008] [Indexed: 11/08/2022]
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21
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Multimodality rodent imaging chambers for use under barrier conditions with gas anesthesia. Mol Imaging Biol 2008; 11:100-6. [PMID: 18679755 DOI: 10.1007/s11307-008-0165-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2008] [Revised: 04/23/2008] [Accepted: 05/06/2008] [Indexed: 10/21/2022]
Abstract
PURPOSE The ability to reproducibly and repeatedly image rodents in noninvasive imaging systems, such as small-animal positron emission tomography (PET) and computed tomography (CT), requires a reliable method for anesthetizing, positioning, and heating animals in a simple reproducible manner. In this paper, we demonstrate that mice and rats can be reproducibly and repeatedly imaged using an imaging chamber designed to be rigidly mounted on multiple imaging systems. PROCEDURES Mouse and rat imaging chambers were made of acrylic plastic and aluminum. MicroCT scans were used to evaluate the positioning reproducibility of the chambers in multimodality and longitudinal imaging studies. The ability of the chambers to maintain mouse and rat body temperatures while anesthetized with gas anesthesia was also evaluated. RESULTS Both the mouse and rat imaging chambers were able to reproducibly position the animals in the imaging systems with a small degree of error. Placement of the mouse in the mouse imaging chamber resulted in a mean distance of 0.23 mm per reference point in multimodality studies, whereas for longitudinal studies the mean difference was 1.11 mm. The rat chamber resulted in a mean difference of 0.46 mm in multimodality studies and a mean difference of 4.31 mm in longitudinal studies per reference point. The chambers maintained rodent body temperatures at the set point temperature of 38 degrees C. CONCLUSIONS The rodent imaging chambers were able to reproducibly position rodents in tomographs with a small degree of variability and were compatible with routine use. The embedded anesthetic line and heating system was capable of maintaining the rodent's temperature and anesthetic state, thereby enhancing rodent health and improving data collection reliability.
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Ami Y, Nagata N, Shirato K, Watanabe R, Iwata N, Nakagaki K, Fukushi S, Saijo M, Morikawa S, Taguchi F. Co-infection of respiratory bacterium with severe acute respiratory syndrome coronavirus induces an exacerbated pneumonia in mice. Microbiol Immunol 2008; 52:118-27. [PMID: 18380809 PMCID: PMC7168413 DOI: 10.1111/j.1348-0421.2008.00011.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 12/06/2007] [Indexed: 12/30/2022]
Abstract
SARS-CoV grows in a variety of tissues that express its receptor, although the mechanism for high replication in the lungs and severe respiratory illness is not well understood. We recently showed that elastase enhances SARS-CoV infection in cultured cells, which suggests that SARS development may be due to elastase-mediated, enhanced SARS-CoV infection in the lungs. To explore this possibility, we examined whether co-infection of mice with SARS-CoV and Pp, a low-pathogenic bacterium which elicits elastase production in the lungs, induces exacerbation of pneumonia. Mice co-infected with SARS-CoV and Pp developed severe respiratory disease with extensive weight loss, resulting in a 33~90% mortality rate. Mice with exacerbated pneumonia showed enhanced virus infection in the lungs and histopathological lesions similar to those found in human SARS cases. Intranasal administration of LPS, another elastase inducer, showed an effect similar to that of Pp infection. Thus, this study shows that exacerbated pneumonia in mice results from co-infection with SARS-CoV and a respiratory bacterium that induces elastase production in the lungs, suggesting a possible role for elastase in the exacerbation of pneumonia.
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Affiliation(s)
- Yasushi Ami
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Noriyo Nagata
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Kazuya Shirato
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Rie Watanabe
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Naoko Iwata
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Keiko Nakagaki
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Shuetsu Fukushi
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Masayuki Saijo
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Shigeru Morikawa
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
| | - Fumihiro Taguchi
- National Institute of Infectious Diseases, Murayama Branch, 4‐7‐1 Gakuen, Musashi‐Murayama, Tokyo 208‐0011, Japan
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MicroCT Liver Contrast Agent Enhancement Over Time, Dose, and Mouse Strain. Mol Imaging Biol 2008; 10:114-20. [DOI: 10.1007/s11307-007-0128-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2007] [Revised: 11/06/2007] [Accepted: 11/15/2007] [Indexed: 10/22/2022]
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Bernhard W, Schmiedl A, Koster G, Orgeig S, Acevedo C, Poets CF, Postle AD. Developmental changes in rat surfactant lipidomics in the context of species variability. Pediatr Pulmonol 2007; 42:794-804. [PMID: 17659602 DOI: 10.1002/ppul.20657] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Lung surfactant comprises mainly phosphatidylcholine (PC) species together with phosphatidylglycerols and surfactant proteins (SP) SP-A to -D. Changes in the concentrations of its principal components dipalmitoyl-PC, palmitoylmyristoyl-PC, palmitoylpalmitoleoyl-PC relative to developmental, structural and physiological differences are only partially understood. Particularly, their attribution to differences in air-liquid interface curvature, compared with dynamic parameters, such as respiratory rate, are controversial. We postulated that during alveolarization the changes in these principal PC components of surfactant differ from those in other phospholipid parameters, and that across endothermic vertebrates their concentrations are related to lung physiology rather than structure. We therefore investigated in rats from postnatal day (d)1 to d42 the pattern of surfactant phospholipids relative to alveolarization (d4-d14), and we discuss these changes in terms of molecular adaptation to pulmonary structure or physiology. Contrary to mammals with advanced alveolarization and increased respiratory rate (RR) at term, concentrations of dipalmitoyl-PC (49-52%) and palmitoylmyristoyl-PC (7-9%) in lung lavage fluid were identical at d1 and d42. At d7-d14, when in rats RR is increased, palmitoyl-myristoyl-PC transiently increased by 2.5- to 3.9-fold at the expense of dipalmitoyl-PC (-32% to 34%) and palmitoyl-palmitoleoyl-PC (-16%). Other lipidomic changes followed essentially different patterns of increase or decrease. Palmitoyl-myristoyl-PC was increased in large aggregates suggesting that it is an integral component of active surfactant. In the overall context of vertebrates, irrespective of age and lung structure, fractions of palmitoyl-myristoyl-PC, dipalmitoyl-PC and palmitoyl-palmitoleoyl-PC correlate with differences in RR rather than alveolar curvature. In adult mammals, however, only concentrations of palmitoyl-palmitoleoyl-PC correlate with RR.
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Affiliation(s)
- Wolfgang Bernhard
- Department of Neonatology, Faculty of Medicine, Eberhard-Karls-University, Tübingen, Germany.
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Kitano H, Young JM, Cheng J, Wang L, Hurn PD, Murphy SJ. Gender-specific response to isoflurane preconditioning in focal cerebral ischemia. J Cereb Blood Flow Metab 2007; 27:1377-86. [PMID: 17264860 PMCID: PMC2266686 DOI: 10.1038/sj.jcbfm.9600444] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Inhalation anesthetics are effective chemical preconditioning agents in experimental cerebral ischemia. However, previous work has been performed exclusively in male animals. We determined if there is a gender difference in ischemic outcome after isoflurane preconditioning (IsoPC), and if this sex-specific response is linked to differences in Akt phosphorylation or expression of neuronal inducible cell-death putative kinase (NIPK), a negative modulator of Akt activation. Young and middle-aged male and female mice were preconditioned for 4 h with air (sham PC) or 1.0% IsoPC and recovered for 24 h. Cortices were subdissected from preconditioned young male and female mice for measurement of Akt phosphorylation (Western blot) and NIPK mRNA (quantitative polymerase chain reaction). Additional cohorts underwent 2 h of reversible middle cerebral artery occlusion. Lastly, male and female Akt1(+/+) and Akt1(-/-) mice were studied to determine if gender differences in ischemic outcome after IsoPC is Akt1-dependent. Infarction volume was determined at 22 h reperfusion (2,3,5-triphenyltetrazolium chloride). As expected, IsoPC decreased ischemic damage as compared with sham PC in young and middle-aged male mice. In contrast, IsoPC markedly increased infarction in young female mice and had no effect in middle-aged female mice. Cortical phospho-Akt was increased by IsoPC versus sham PC only in male mice. No increase was observed in IsoPC female mice. NIPK mRNA was higher in female mice than in male mice regardless of preconditioning status. Male IsoPC neuroprotection was lost in Akt1-deficient male mice. We conclude that IsoPC is beneficial only in ischemic male brain and that sex differences in IsoPC are mediated through Akt activation and basal NIPK expression.
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Affiliation(s)
- Hideto Kitano
- Anesthesiology and Peri-Operative Medicine, Oregon Health and Science University, Portland, Oregon 97239-3098, USA
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Tinkey P, Lembo T, Craig S, West C, Van Pelt C. Use of the i-STAT portable clinical analyzer in mice. Lab Anim (NY) 2006; 35:45-50. [PMID: 16446737 DOI: 10.1038/laban0206-45] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2005] [Accepted: 01/03/2006] [Indexed: 11/08/2022]
Abstract
The use of portable chemistry analyzers is an attractive option for obtaining clinical pathology panels in mice, because these analyzers require only small volumes of whole blood. However, in studies with other animals, portable analyzers do not always agree with results obtained using standard laboratory equipment. The authors evaluated the use of the i-STAT handheld portable clinical analyzer compared to the use of standard nonportable laboratory instruments in mice. As shown with other species, the i-STAT results did not always agree with standard laboratory instruments; however, the i-STAT does show reliability for certain chemistry assays.
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Affiliation(s)
- Peggy Tinkey
- Department of Veterinary Medicine and Surgery, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.
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Diagnosis | Mammary adenocarcinoma due to atypical expression of TRAMP transgene. Lab Anim (NY) 2005. [DOI: 10.1038/laban0405-32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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