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Chen K, Zhang S, Cui G, Zhang X, Song Y, Zheng J, Chen Y, Zheng T. Establishment of a hybrid model of atherosclerosis and acute colitis in ApoE-/- mice. PLoS One 2024; 19:e0289820. [PMID: 38498570 PMCID: PMC10947657 DOI: 10.1371/journal.pone.0289820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 07/27/2023] [Indexed: 03/20/2024] Open
Abstract
Inflammatory bowel disease (IBD) and atherosclerosis (AS) are both common chronic inflammatory diseases with similar pathophysiological mechanisms. Some studies have shown that IBD patients are at increased risk for early atherosclerosis, myocardial infarction and venous thrombosis. Here we set up a hybrid mouse model associated with atherosclerosis and acute colitis in order to investigate the interplay of the two diseases. We fed ApoE-/- mice with high fat diet to establish atherosclerosis model, and used animal ultrasound machine to detect the artery of mice noninvasively. Then a new hybrid model of atherosclerosis and acute colitis was prepared by drinking water for 7 days. At the end of the experiment, the hybrid model mice showed typically pathological and intuitionistic changes of atherosclerosis and acute colitis. We found the shortened colon length, high histopathological scores of the colon with mucosal erosion and necrosis, hyperlipidemia, a plaque-covered mouse aorta and plaque with foam cells and lipid deposition in the hybrid model group, which proved that the hybrid model was successfully established. At the same time, ultrasonic detection showed that the end-diastolic blood flow velocity and the relative dilation value were decreased, while systolic time / diastolic time, the wall thickness, systolic diameters as well as diastolic diameters were gradually increased, and statistical significance appeared as early as 8 weeks. We clearly described the process of establishing a hybrid model of atherosclerosis and acute colitis, which might provide a repeatable platform for the interaction mechanism exploring and drug screening of atherosclerosis and inflammatory bowel disease in preclinical study.
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Affiliation(s)
- Keke Chen
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
- Department of Ultrasound, Nanjing Drum Tower Hospital, Nanjing, P. R. China
| | - Shengwei Zhang
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
| | - Guanghui Cui
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
| | - Xue Zhang
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
| | - Yujian Song
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
- Department of Ultrasound, Foshan First People’s Hospital, Foshan, P. R. China
| | - Jie Zheng
- Department of Traditional Chinese Medicine, Peking University Shenzhen Hospital, Shenzhen, P. R. China
| | - Yun Chen
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
| | - Tingting Zheng
- Shenzhen Key Laboratory for Drug Addiction and Medication Safety, Department of Ultrasound, Institute of Ultrasonic Medicine, Peking University Shenzhen Hospital, The Hong Kong University of Science and Technology Medical Center, Shenzhen- Peking University, Shenzhen, P. R. China
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Liu H, Li X, Song Y, Wang Z. MicroRNA-217 attenuates intima-media complex thickness of ascending aorta measured by ultrasound bio-microscopy and inhibits inflammation and lipid metabolism in atherosclerotic models of ApoE -/- mice. Lipids Health Dis 2018; 17:170. [PMID: 30041636 PMCID: PMC6058357 DOI: 10.1186/s12944-018-0825-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 07/11/2018] [Indexed: 12/15/2022] Open
Abstract
Background Little investigation was done to test the efficiency of microRNA-217 (miR-217) on atherosclerosis in vivo. Methods ApoE−/− mice were used to construct atherosclerotic models and ultrasound bio-microscopy (UBM) was applied to detect the intima–media thickness (IMT) of the ascending aorta. The serum level of miR-217 and correlation with IMT was investigated. After miR-217 mimic administration, the IMT, inflammation, and lipid-associated molecules were assayed. Results The serum level of miR-217 was reduced in ApoE−/− mice and showed a negative correlation with the IMT of the ascending aorta (r2 = 0.5899, p < 0.0001). miR-217 mimic administration attenuated IMT and down-regulated the level of serum triglyceride (TG), total cholesterol (TC), and low-density-lipoprotein cholesterol (LDL-C), while it could up-regulate high-density lipoprotein cholesterol (HDL-C). Inflammation relevant genes, such as F4/80, tumor necrosis factor (TNF)-α, interleukin (IL)-1, IL-6, and monocyte chemoattractant protein (MCP)-1, and lipid metabolism associated gene, such as LDL receptor, class A scavenger receptors (SR-A), scavenger receptor class B type I (SR-BI), CD36, ATP binding cassette subfamily A member 1 (ABCA1), and ATP binding cassette subfamily G member 1 (ABCG1) in the aorta were significantly down-regulated in miR-217 group when compared with atherosclerosis group. Conclusion miR-217 could down-regulate IMT and modulate the inflammation and lipid metabolism process, which indicates that miR-217 could be a potential treatment option.
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Affiliation(s)
- Haina Liu
- Department of Ultrasonography, The Affiliated Qingdao Municipal Hospital of Qingdao University, No.1 Jiaozhou Road, Qingdao, 266011, China
| | - Xia Li
- Department of Ultrasonography, The Affiliated Qingdao Municipal Hospital of Qingdao University, No.1 Jiaozhou Road, Qingdao, 266011, China
| | - Yanpeng Song
- Department of Ultrasonography, Jiaozhou Central Hospital of Qingdao, No.29 Xuzhou Road, Jiaozhou, 266300, China
| | - Zhibin Wang
- Department of Ultrasonography, The Affiliated Hospital of Qingdao University, No.16 Jiangsu Road, Qingdao, 266003, China.
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Guo Y, Liu XC, Wang YJ, Li Q, Yang Q, Weng XG, Chen Y, Cai WY, Kan XX, Chen X, Huang HF, Zhu XX, Li YJ. Effects of Shenlian extract on experimental atherosclerosis in ApoE-deficient mice based on ultrasound biomicroscopy. Altern Ther Health Med 2016; 16:469. [PMID: 27846838 PMCID: PMC5111256 DOI: 10.1186/s12906-016-1449-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 11/07/2016] [Indexed: 11/10/2022]
Abstract
Background This study directly and dynamically investigated the effects of SL extract (i.e., a combination of Radix Salviae miltiorrhizae and Andrographis paniculata extract) on plaque progression in vivo by high resolution ultrasound biomicroscopy (UBM). Methods An atherosclerosis model was established by placing a perivascular collar on the right common carotid artery in apolipoprotein E-deficient (ApoE-/-) mice. Thickness, plaque area and local blood flow were observed by UBM, pathological changes were observed by histochemical staining, and lipid levels were measured by respective commercially available kits. Results Compared with the model group, the SL extract groups showed reduced wall thickness of the aortic arch (GC: P = 0.001, P = 0.002, and P < 0.001; LC: P < 0.001, P < 0.001, and P < 0.001; BC: P = 0.027, P = 0.017, and P = 0.003; respectively), which presented with retarded plaque progression of the cartoid artery with concordantly increased blood flow (P = 0.002 and P < 0.001) as visualized in vivo by UBM. Histological analysis confirmed the reduction of carotid atherosclerosis. Conclusions The SL extract inhibited the formation of atherosclerotic plaques in an ApoE-/- mice model by UBM analysis, and did so by effects that ameliorated local blood flow and improved blood lipid levels.
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Abstract
BACKGROUND Chronic rejection leading to allograft loss remains a significant concern after facial allotransplantation. Chronic rejection may occur without clinical signs or symptoms. The current means of monitoring is histologic analyses of allograft biopsy specimens, which is both invasive and impractical. Prior data suggest that chronic rejection is associated with changes in intima and media thickness of vessels in arms and solid organ allografts; such data have not been published for face transplant recipients. METHODS The authors used a 48-MHz transducer to acquire images of the bilateral facial, radial, dorsalis pedis and, if applicable, sentinel flap arteries in five face transplant recipients (8 months to 4.5 years after transplantation) and five control subjects. The authors assessed the intima, media, and adventitia thickness plus lumen and the total vessel diameter and area. RESULTS Face transplant recipients had thicker intima in all sites compared with controls, but the ratio of the intimal thickness of facial and radial arteries was similar in face transplant recipients compared with controls (1.00 versus 0.95; p = 0.742). Intraobserver correlation showed reliable reproducibility of the measurements (r = 0.935, p ≤ 0.001). Interobserver correlation demonstrated reproducibility of intima measurements (r = 0.422, p ≤ 0.001). CONCLUSION The authors demonstrate that ultrasound biomicroscopy is feasible for postsurgical monitoring, and have developed a new benchmark parameter, the facial artery-to-radial artery intimal thickness ratio, to be used in future testing in the setting of chronic rejection. CLINICAL QUESTION/LEVEL OF EVIDENCE Diagnostic, IV.
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Harmon EY, Fronhofer V, Keller RS, Feustel PJ, Zhu X, Xu H, Avram D, Jones DM, Nagarajan S, Lennartz MR. Anti-inflammatory immune skewing is atheroprotective: Apoe−/−FcγRIIb−/− mice develop fibrous carotid plaques. J Am Heart Assoc 2015; 3:e001232. [PMID: 25516435 PMCID: PMC4338708 DOI: 10.1161/jaha.114.001232] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Background Stroke, caused by carotid plaque rupture, is a major cause of death in the United States. Whereas vulnerable human plaques have higher Fc receptor (FcγR) expression than their stable counterparts, how FcγR expression impacts plaque histology is unknown. We investigated the role of FcγRIIb in carotid plaque development and stability in apolipoprotein (Apo)e−/− and Apoe−/−FcγRIIb−/− double knockout (DKO) animals. Methods and Results Plaques were induced by implantation of a shear stress‐modifying cast around the carotid artery. Plaque length and stenosis were followed longitudinally using ultrasound biomicroscopy. Immune status was determined by flow cytometry, cytokine release, immunoglobulin G concentration and analysis of macrophage polarization both in plaques and in vitro. Surprisingly, DKO animals had lower plaque burden in both carotid artery and descending aorta. Plaques from Apoe−/− mice were foam‐cell rich and resembled vulnerable human specimens, whereas those from DKO mice were fibrous and histologically stable. Plaques from DKO animals expressed higher arginase 1 (Arg‐1) and lower inducible nitric oxide synthase (iNOS), indicating the presence of M2 macrophages. Analysis of blood and cervical lymph nodes revealed higher interleukin (IL)‐10, immune complexes, and regulatory T cells (Tregs) and lower IL‐12, IL‐1β, and tumor necrosis factor alpha (TNF‐α) in DKO mice. Similarly, in vitro stimulation produced higher IL‐10 and Arg‐1 and lower iNOS, IL‐1β, and TNF‐α in DKO versus Apoe−/− macrophages. These results define a systemic anti‐inflammatory phenotype. Conclusions We hypothesized that removal of FcγRIIb would exacerbate atherosclerosis and generate unstable plaques. However, we found that deletion of FcγRIIb on a congenic C57BL/6 background induces an anti‐inflammatory Treg/M2 polarization that is atheroprotective.
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Affiliation(s)
- Erin Y Harmon
- Centers for Cell Biology and Cancer Research, Albany Medical College, Albany, NY
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Zhang X, Ha S, Wei W, Duan S, Shi Y, Yang Y. Noninvasive imaging of aortic atherosclerosis by ultrasound biomicroscopy in a mouse model. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2015; 34:111-116. [PMID: 25542946 DOI: 10.7863/ultra.34.1.111] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVES The noninvasive and accurate evaluation of vessel characteristics in mouse models has become an intensive focus of vascular medicine. This study aimed to apply ultrasound biomicroscopy to evaluate aortic atherosclerotic progression in a low-density lipoprotein receptor (LDL-R) knockout mouse model of atherosclerosis. METHODS Ten male LDL-R(-/-)C57BL/6 mice aged 16 and 24 weeks and 8 male wild-type C57BL/6 mice aged 16 and 24 weeks were used as experimental and control groups, respectively. Ultrasound biomicroscopy was applied to detect the morphologic characteristics of the aortic root, ascending aorta, aortic arch, and carotid artery and to measure the aortic root intima-media thickness and carotid artery bifurcation. RESULTS Ultrasound biomicroscopy showed a significant increase in the aortic root intima-media thickness from 0.10 ± 0.03 mm in 16-week-old mice to 0.16 ± 0.04 mm in 24-week-old mice (P < .01). The ultrasound biomicroscopically measured intima-media thickness was highly correlated with the histologic measurement (r = 0.81). CONCLUSIONS Ultrasound biomicroscopy could be used for a noninvasive, accurate, and dynamic analysis of aortic atherosclerosis in LDL-R knockout mice.
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Affiliation(s)
- Xiaoshan Zhang
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.)
| | - Si Ha
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.)
| | - Wei Wei
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.)
| | - Shasha Duan
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.)
| | - Yilu Shi
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.)
| | - Ya Yang
- Department of Ultrasound, Affiliated Hospital of Innermongolia Medical University, Huhhot, China (X.Z., S.H., W.W., S.D., Y.S.); and Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University, Beijing, China (Y.Y.).
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Heinonen SE, Genové G, Bengtsson E, Hübschle T, Åkesson L, Hiss K, Benardeau A, Ylä-Herttuala S, Jönsson-Rylander AC, Gomez MF. Animal models of diabetic macrovascular complications: key players in the development of new therapeutic approaches. J Diabetes Res 2015; 2015:404085. [PMID: 25785279 PMCID: PMC4345079 DOI: 10.1155/2015/404085] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 01/26/2015] [Indexed: 12/19/2022] Open
Abstract
Diabetes mellitus is a lifelong, incapacitating metabolic disease associated with chronic macrovascular complications (coronary heart disease, stroke, and peripheral vascular disease) and microvascular disorders leading to damage of the kidneys (nephropathy) and eyes (retinopathy). Based on the current trends, the rising prevalence of diabetes worldwide will lead to increased cardiovascular morbidity and mortality. Therefore, novel means to prevent and treat these complications are needed. Under the auspices of the IMI (Innovative Medicines Initiative), the SUMMIT (SUrrogate markers for Micro- and Macrovascular hard end points for Innovative diabetes Tools) consortium is working on the development of novel animal models that better replicate vascular complications of diabetes and on the characterization of the available models. In the past years, with the high level of genomic information available and more advanced molecular tools, a very large number of models has been created. Selecting the right model for a specific study is not a trivial task and will have an impact on the study results and their interpretation. This review gathers information on the available experimental animal models of diabetic macrovascular complications and evaluates their pros and cons for research purposes as well as for drug development.
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Affiliation(s)
- Suvi E. Heinonen
- Bioscience, Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, 43183 Mölndal, Sweden
- *Suvi E. Heinonen:
| | - Guillem Genové
- Division of Vascular Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17177 Stockholm, Sweden
| | - Eva Bengtsson
- Department of Clinical Sciences, Lund University Diabetes Centre (LUDC), Lund University, 20502 Malmö, Sweden
| | - Thomas Hübschle
- R&D Diabetes Division, Translational Medicine, Sanofi-Aventis, 65926 Frankfurt am Main, Germany
| | - Lina Åkesson
- Department of Clinical Sciences, Lund University Diabetes Centre (LUDC), Lund University, 20502 Malmö, Sweden
| | - Katrin Hiss
- R&D Diabetes Division, Translational Medicine, Sanofi-Aventis, 65926 Frankfurt am Main, Germany
| | - Agnes Benardeau
- Department of Biotechnology and Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Seppo Ylä-Herttuala
- Pharmaceutical Division, pRED, CV and Metabolic Disease, Hoffmann-La Roche, 4070 Basel, Switzerland
| | - Ann-Cathrine Jönsson-Rylander
- Bioscience, Cardiovascular and Metabolic Diseases, Innovative Medicines and Early Development, AstraZeneca R&D, 43183 Mölndal, Sweden
| | - Maria F. Gomez
- Department of Clinical Sciences, Lund University Diabetes Centre (LUDC), Lund University, 20502 Malmö, Sweden
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Simone TM, Higgins SP, Higgins CE, Lennartz MR, Higgins PJ. Chemical Antagonists of Plasminogen Activator Inhibitor-1: Mechanisms of Action and Therapeutic Potential in Vascular Disease. J Mol Genet Med 2014; 8. [PMID: 26110015 PMCID: PMC4476021 DOI: 10.4172/1747-0862.1000125] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Tessa M Simone
- Center for Cell Biology & Cancer Research, Albany Medical College, Albany, New York 12208, USA
| | - Stephen P Higgins
- Center for Cell Biology & Cancer Research, Albany Medical College, Albany, New York 12208, USA
| | - Craig E Higgins
- Center for Cell Biology & Cancer Research, Albany Medical College, Albany, New York 12208, USA
| | - Michelle R Lennartz
- Center for Cell Biology & Cancer Research, Albany Medical College, Albany, New York 12208, USA
| | - Paul J Higgins
- Center for Cell Biology & Cancer Research, Albany Medical College, Albany, New York 12208, USA
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Nam KH, Bok TH, Jin C, Paeng DG. Asymmetric radial expansion and contraction of rat carotid artery observed using a high-resolution ultrasound imaging system. ULTRASONICS 2014; 54:233-240. [PMID: 23664377 DOI: 10.1016/j.ultras.2013.04.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 03/17/2013] [Accepted: 04/08/2013] [Indexed: 06/02/2023]
Abstract
The geometry of carotid artery bifurcation is of high clinical interest because it determines the characteristics of blood flow that is closely related to the formation and development of atherosclerotic plaque. However, information on the dynamic changes in the vessel wall of carotid artery bifurcation during a pulsatile cycle is limited. This pilot study investigated the cyclic changes in carotid artery geometry caused by blood flow pulsation in rats. A high-resolution ultrasound imaging system with a broadband scanhead centered at 40 MHz was used to obtain longitudinal images of the rat carotid artery. A high frame rate retrospective B-scan imaging technique based on the use of electrocardiogram to trigger signal acquisition was used to examine precisely the fast arterial wall motion. Two-dimensional geometry data obtained from nine rats showed that the rat carotid artery asymmetrically contracts and dilates during each cardiac cycle. Systolic/diastolic vessel diameters near the upstream and downstream regions from the bifurcation were 0.976 ± 0.011/0.825 ± 0.015 mm and 0.766 ± 0.015/0.650 ± 0.016 mm, respectively. Their posterior/anterior wall displacement ratios in the radial direction were 41.0 ± 14.9% and 2.9 ± 1.6%, respectively. These results indicate that in the vicinity of bifurcation, the carotid artery favorably expands to the anterior side during the systolic phase. This phenomenon was observed to be more prominent in the downstream region near the bifurcation. The cyclic variation pattern in wall movement varies depending on the measurement site, which shows different patterns at far upstream and downstream of the bifurcation. The asymmetric radial expansion and contraction of the rat carotid artery observed in this study may be useful in studying the hemodynamic etiology of cardiovascular diseases because the pulsatile changes in vessel geometry may affect the local hemodynamics that determines the spatial distribution of wall shear stress, one of important cardiovascular risk factors. Further systematic study is needed to clarify the effects of wall elasticity, branch angle and vessel diameter ratio on the asymmetric wall motion of carotid artery bifurcation.
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Affiliation(s)
- Kweon-Ho Nam
- Department of Ocean System Engineering, Jeju National University, Jeju, South Korea
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Soletti RC, Alves KZ, Britto MAPD, Matos DGD, Soldan M, Borges HL, Machado JC. Simultaneous follow-up of mouse colon lesions by colonoscopy and endoluminal ultrasound biomicroscopy. World J Gastroenterol 2013; 19:8056-8064. [PMID: 24307800 PMCID: PMC3848154 DOI: 10.3748/wjg.v19.i44.8056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 06/29/2013] [Accepted: 07/25/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the potential use of colonoscopy and endoluminal ultrasonic biomicroscopy (eUBM) to track the progression of mouse colonic lesions.
METHODS: Ten mice were treated with a single azoxymethane intraperitoneal injection (week 1) followed by seven days of a dextran sulfate sodium treatment in their drinking water (week 2) to induce inflammation-associated colon tumors. eUBM was performed simultaneously with colonoscopy at weeks 13, 17-20 and 21. A 3.6-F diameter 40 MHz mini-probe catheter was used for eUBM imaging. The ultrasound mini-probe catheter was inserted into the accessory channel of a pediatric flexible bronchofiberscope, allowing simultaneous acquisition of colonoscopic and eUBM images. During image acquisition, the mice were anesthetized with isoflurane and kept in a supine position over a stainless steel heated surgical waterbed at 37 °C. Both eUBM and colonoscopic images were captured and stored when a lesion was detected by colonoscopy or when the eUBM image revealed a modified colon wall anatomy. During the procedure, the colon was irrigated with water that was injected through a flush port on the mini-probe catheter and that acted as the ultrasound coupling medium between the transducer and the colon wall. Once the acquisition of the last eUBM/colonoscopy section for each animal was completed, the colons were fixed, paraffin-embedded, and stained with hematoxylin and eosin. Colon images acquired at the first time-point for each mouse were compared with subsequent eUBM/colonoscopic images of the same sites obtained in the following acquisitions to evaluate lesion progression.
RESULTS: All 10 mice had eUBM and colonoscopic images acquired at week 13 (the first time-point). Two animals died immediately after the first imaging acquisition and, consequently, only 8 mice were subjected to the second eUBM/colonoscopy imaging acquisition (at the second time-point). Due to the advanced stage of colonic tumorigenesis, 5 animals died after the second time-point image acquisition, and thus, only three were subjected to the third eUBM/colonoscopy imaging acquisition (the third time-point). eUBM was able to detect the four layers in healthy segments of colon: the mucosa (the first hyperechoic layer moving away from the mini-probe axis), followed by the muscularis mucosae (hypoechoic), the submucosa (the second hyperechoic layer) and the muscularis externa (the second hypoechoic layer). Hypoechoic regions between the mucosa and the muscularis externa layers represented lymphoid infiltrates, as confirmed by the corresponding histological images. Pedunculated tumors were represented by hyperechoic masses in the mucosa layer. Among the lesions that decreased in size between the first and third time-points, one of the lesions changed from a mucosal hyperplasia with ulceration at the top to a mucosal hyperplasia with lymphoid infiltrate and, finally, to small signs of mucosal hyperplasia and lymphoid infiltrate. In this case, while lesion regression and modification were observable in the eUBM images, colonoscopy was only able to detect the lesion at the first and second time-points, without the capacity to demonstrate the presence of lymphoid infiltrate. Regarding the lesions that increased in size, one of them started as a small elevation in the mucosa layer and progressed to a pedunculated tumor. In this case, while eUBM imaging revealed the lesion at the first time-point, colonoscopy was only able to detect it at the second time-point. All colonic lesions (tumors, lymphoid infiltrate and mucosal thickening) were identified by eUBM, while colonoscopy identified just 76% of them. Colonoscopy identified all of the colonic tumors but failed to diagnose lymphoid infiltrates and increased mucosal thickness and failed to differentiate lymphoid infiltrates from small adenomas. During the observation period, most of the lesions (approximately 67%) increased in size, approximately 14% remained unchanged, and 19% regressed.
CONCLUSION: Combining eUBM with colonoscopy improves the diagnosis and the follow-up of mouse colonic lesions, adding transmural assessment of the bowel wall.
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Tao M, Mauro CR, Yu P, Favreau JT, Nguyen B, Gaudette GR, Ozaki CK. A simplified murine intimal hyperplasia model founded on a focal carotid stenosis. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 182:277-87. [PMID: 23159527 DOI: 10.1016/j.ajpath.2012.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 09/28/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022]
Abstract
Murine models offer a powerful tool for unraveling the mechanisms of intimal hyperplasia and vascular remodeling, although their technical complexity increases experimental variability and limits widespread application. We describe a simple and clinically relevant mouse model of arterial intimal hyperplasia and remodeling. Focal left carotid artery (LCA) stenosis was created by placing 9-0 nylon suture around the artery using an external 35-gauge mandrel needle (middle or distal location), which was then removed. The effect of adjunctive diet-induced obesity was defined. Flowmetry, wall strain analyses, biomicroscopy, and histology were completed. LCA blood flow sharply decreased by ∼85%, followed by a responsive right carotid artery increase of ∼71%. Circumferential strain decreased by ∼2.1% proximal to the stenosis in both dietary groups. At 28 days, morphologic adaptations included proximal LCA intimal hyperplasia, which was exacerbated by diet-induced obesity. The proximal and distal LCA underwent outward and negative inward remodeling, respectively, in the mid-focal stenosis (remodeling indexes, 1.10 and 0.53). A simple, defined common carotid focal stenosis yields reproducible murine intimal hyperplasia and substantial differentials in arterial wall adaptations. This model offers a tool for investigating mechanisms of hemodynamically driven intimal hyperplasia and arterial wall remodeling.
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Affiliation(s)
- Ming Tao
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
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