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Goyon V, Besse‐Patin A, Zunino R, Ignatenko O, Nguyen M, Coyaud É, Lee JM, Nguyen BN, Raught B, McBride HM. MAPL loss dysregulates bile and liver metabolism in mice. EMBO Rep 2023; 24:e57972. [PMID: 37962001 PMCID: PMC10702803 DOI: 10.15252/embr.202357972] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 10/10/2023] [Accepted: 10/17/2023] [Indexed: 11/15/2023] Open
Abstract
Mitochondrial and peroxisomal anchored protein ligase (MAPL) is a dual ubiquitin and small ubiquitin-like modifier (SUMO) ligase with roles in mitochondrial quality control, cell death and inflammation in cultured cells. Here, we show that MAPL function in the organismal context converges on metabolic control, as knockout mice are viable, insulin-sensitive, and protected from diet-induced obesity. MAPL loss leads to liver-specific activation of the integrated stress response, inducing secretion of stress hormone FGF21. MAPL knockout mice develop fully penetrant spontaneous hepatocellular carcinoma. Mechanistically, the peroxisomal bile acid transporter ABCD3 is a primary MAPL interacting partner and SUMOylated in a MAPL-dependent manner. MAPL knockout leads to increased bile acid production coupled with defective regulatory feedback in liver in vivo and in isolated primary hepatocytes, suggesting cell-autonomous function. Together, our findings establish MAPL function as a regulator of bile acid synthesis whose loss leads to the disruption of bile acid feedback mechanisms. The consequences of MAPL loss in liver, along with evidence of tumor suppression through regulation of cell survival pathways, ultimately lead to hepatocellular carcinogenesis.
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Affiliation(s)
- Vanessa Goyon
- Montreal Neurological InstituteMcGill UniversityMontrealQCCanada
| | | | - Rodolfo Zunino
- Montreal Neurological InstituteMcGill UniversityMontrealQCCanada
| | - Olesia Ignatenko
- Montreal Neurological InstituteMcGill UniversityMontrealQCCanada
| | - Mai Nguyen
- Montreal Neurological InstituteMcGill UniversityMontrealQCCanada
| | - Étienne Coyaud
- Princess Margaret Cancer CentreUniversity Health NetworkTorontoONCanada
- Department of Medical BiophysicsUniversity of TorontoTorontoONCanada
| | - Jonathan M Lee
- Biochemistry, Microbiology & ImmunologyUniversity of OttawaOttawaONCanada
| | - Bich N Nguyen
- Department of Pathology and Cell BiologyUniversity of MontrealMontrealQCCanada
- University of Montreal Health NetworkMontrealQCCanada
| | - Brian Raught
- Princess Margaret Cancer CentreUniversity Health NetworkTorontoONCanada
- Department of Medical BiophysicsUniversity of TorontoTorontoONCanada
| | - Heidi M McBride
- Montreal Neurological InstituteMcGill UniversityMontrealQCCanada
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Gunes A, Schmitt C, Bilodeau L, Huet C, Belblidia A, Baldwin C, Giard JM, Biertho L, Lafortune A, Couture CY, Cheung A, Nguyen BN, Galun E, Bémeur C, Bilodeau M, Laplante M, Tang A, Faraj M, Estall JL. IL-6 Trans-Signaling Is Increased in Diabetes, Impacted by Glucolipotoxicity, and Associated With Liver Stiffness and Fibrosis in Fatty Liver Disease. Diabetes 2023; 72:1820-1834. [PMID: 37757741 PMCID: PMC10658070 DOI: 10.2337/db23-0171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023]
Abstract
Many people living with diabetes also have nonalcoholic fatty liver disease (NAFLD). Interleukin-6 (IL-6) is involved in both diseases, interacting with both membrane-bound (classical) and circulating (trans-signaling) soluble receptors. We investigated whether secretion of IL-6 trans-signaling coreceptors are altered in NAFLD by diabetes and whether this might associate with the severity of fatty liver disease. Secretion patterns were investigated with use of human hepatocyte, stellate, and monocyte cell lines. Associations with liver pathology were investigated in two patient cohorts: 1) biopsy-confirmed steatohepatitis and 2) class 3 obesity. We found that exposure of stellate cells to high glucose and palmitate increased IL-6 and soluble gp130 (sgp130) secretion. In line with this, plasma sgp130 in both patient cohorts positively correlated with HbA1c, and subjects with diabetes had higher circulating levels of IL-6 and trans-signaling coreceptors. Plasma sgp130 strongly correlated with liver stiffness and was significantly increased in subjects with F4 fibrosis stage. Monocyte activation was associated with reduced sIL-6R secretion. These data suggest that hyperglycemia and hyperlipidemia can directly impact IL-6 trans-signaling and that this may be linked to enhanced severity of NAFLD in patients with concomitant diabetes. ARTICLE HIGHLIGHTS IL-6 and its circulating coreceptor sgp130 are increased in people with fatty liver disease and steatohepatitis. High glucose and lipids stimulated IL-6 and sgp130 secretion from hepatic stellate cells. sgp130 levels correlated with HbA1c, and diabetes concurrent with steatohepatitis further increased circulating levels of all IL-6 trans-signaling mediators. Circulating sgp130 positively correlated with liver stiffness and hepatic fibrosis. Metabolic stress to liver associated with fatty liver disease might shift the balance of IL-6 classical versus trans-signaling, promoting liver fibrosis that is accelerated by diabetes.
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Affiliation(s)
- Aysim Gunes
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
- Montreal Diabetes Research Centre, Montreal, Quebec, Canada
| | - Clémence Schmitt
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Programmes de biologie moléculaire, Faculté de médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Laurent Bilodeau
- Département de radiologie, Centre hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Catherine Huet
- Département de radiologie, Centre hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Assia Belblidia
- Département de radiologie, Centre hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Cindy Baldwin
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
| | - Jeanne-Marie Giard
- Liver Unit, Centre hospitalier de l’Université de Montréal (CHUM), Département de médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Laurent Biertho
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
- Département de chirurgie, Faculté de médecine, Université Laval, Quebec City, Quebec, Canada
| | - Annie Lafortune
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
- Département de chirurgie, Faculté de médecine, Université Laval, Quebec City, Quebec, Canada
| | - Christian Yves Couture
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
- Département de biologie moléculaire, biochimie médicale et pathologie, Université Laval, Quebec City, Quebec, Canada
| | - Angela Cheung
- Gastroenterology and Hepatology, Department of Medicine, The Ottawa Hospital, Ottawa, Ontario, Canada
| | - Bich N. Nguyen
- Département de pathologie et biologie cellulaire, Université de Montréal, Montreal, Quebec, Canada
| | - Eithan Galun
- Goldyne Savad Institute of Gene Therapy, Hadassah Hebrew University Hospital, Jerusalem, Israel
| | - Chantal Bémeur
- Département de nutrition, Université de Montréal, Montreal, Quebec, Canada
- Labo HépatoNeuro, Centre de recherche du CHUM, Montreal, Quebec, Canada
| | - Marc Bilodeau
- Liver Unit, Centre hospitalier de l’Université de Montréal (CHUM), Département de médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Mathieu Laplante
- Montreal Diabetes Research Centre, Montreal, Quebec, Canada
- Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
| | - An Tang
- Département de radiologie, Centre hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - May Faraj
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
- Montreal Diabetes Research Centre, Montreal, Quebec, Canada
- Département de nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Jennifer L. Estall
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
- Montreal Diabetes Research Centre, Montreal, Quebec, Canada
- Programmes de biologie moléculaire, Faculté de médecine, Université de Montréal, Montreal, Quebec, Canada
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Djinbachian R, Khellaf A, Noyon B, Soucy G, Nguyen BN, von Renteln D. Accuracy of measuring colorectal polyp size in pathology: a prospective study. Gut 2023; 72:2015-2018. [PMID: 37507216 DOI: 10.1136/gutjnl-2023-330241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023]
Affiliation(s)
- Roupen Djinbachian
- Gastroenterology, Montreal University Hospital Center (CHUM), Montreal, Quebec, Canada
- Gastroenterology, Montreal University Hospital Research Center (CRCHUM), Montreal, Quebec, Canada
| | - Abdelhakim Khellaf
- Pathology, Montreal University Hospital Center (CHUM), Montreal, Quebec, Canada
| | - Brandon Noyon
- Gastroenterology, Montreal University Hospital Research Center (CRCHUM), Montreal, Quebec, Canada
| | - Geneviève Soucy
- Pathology, Montreal University Hospital Center (CHUM), Montreal, Quebec, Canada
| | - Bich N Nguyen
- Pathology, Montreal University Hospital Center (CHUM), Montreal, Quebec, Canada
| | - Daniel von Renteln
- Gastroenterology, Montreal University Hospital Center (CHUM), Montreal, Quebec, Canada
- Gastroenterology, Montreal University Hospital Research Center (CRCHUM), Montreal, Quebec, Canada
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Vianna P, Calce SI, Boustros P, Larocque-Rigney C, Patry-Beaudoin L, Luo YH, Aslan E, Marinos J, Alamri TM, Vu KN, Murphy-Lavallée J, Billiard JS, Montagnon E, Li H, Kadoury S, Nguyen BN, Gauthier S, Therien B, Rish I, Belilovsky E, Wolf G, Chassé M, Cloutier G, Tang A. Comparison of Radiologists and Deep Learning for US Grading of Hepatic Steatosis. Radiology 2023; 309:e230659. [PMID: 37787678 DOI: 10.1148/radiol.230659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Background Screening for nonalcoholic fatty liver disease (NAFLD) is suboptimal due to the subjective interpretation of US images. Purpose To evaluate the agreement and diagnostic performance of radiologists and a deep learning model in grading hepatic steatosis in NAFLD at US, with biopsy as the reference standard. Materials and Methods This retrospective study included patients with NAFLD and control patients without hepatic steatosis who underwent abdominal US and contemporaneous liver biopsy from September 2010 to October 2019. Six readers visually graded steatosis on US images twice, 2 weeks apart. Reader agreement was assessed with use of κ statistics. Three deep learning techniques applied to B-mode US images were used to classify dichotomized steatosis grades. Classification performance of human radiologists and the deep learning model for dichotomized steatosis grades (S0, S1, S2, and S3) was assessed with area under the receiver operating characteristic curve (AUC) on a separate test set. Results The study included 199 patients (mean age, 53 years ± 13 [SD]; 101 men). On the test set (n = 52), radiologists had fair interreader agreement (0.34 [95% CI: 0.31, 0.37]) for classifying steatosis grades S0 versus S1 or higher, while AUCs were between 0.49 and 0.84 for radiologists and 0.85 (95% CI: 0.83, 0.87) for the deep learning model. For S0 or S1 versus S2 or S3, radiologists had fair interreader agreement (0.30 [95% CI: 0.27, 0.33]), while AUCs were between 0.57 and 0.76 for radiologists and 0.73 (95% CI: 0.71, 0.75) for the deep learning model. For S2 or lower versus S3, radiologists had fair interreader agreement (0.37 [95% CI: 0.33, 0.40]), while AUCs were between 0.52 and 0.81 for radiologists and 0.67 (95% CI: 0.64, 0.69) for the deep learning model. Conclusion Deep learning approaches applied to B-mode US images provided comparable performance with human readers for detection and grading of hepatic steatosis. Published under a CC BY 4.0 license. Supplemental material is available for this article. See also the editorial by Tuthill in this issue.
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Affiliation(s)
- Pedro Vianna
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Sara-Ivana Calce
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Pamela Boustros
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Cassandra Larocque-Rigney
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Laurent Patry-Beaudoin
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Yi Hui Luo
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Emre Aslan
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - John Marinos
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Talal M Alamri
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Kim-Nhien Vu
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Jessica Murphy-Lavallée
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Jean-Sébastien Billiard
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Emmanuel Montagnon
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Hongliang Li
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Samuel Kadoury
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Bich N Nguyen
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Shanel Gauthier
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Benjamin Therien
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Irina Rish
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Eugene Belilovsky
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Guy Wolf
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Michaël Chassé
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - Guy Cloutier
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
| | - An Tang
- From the Department of Imaging and Engineering (P.V., S.I.C., C.L.R., L.P.B., E.M., H.L., S.K., M.C., G.C., A.T.), Laboratory of Biorheology and Medical Ultrasonics (P.V., G.C.), and Clinical Laboratory of Image Processing (E.M., A.T.), Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Canada; Institute of Biomedical Engineering (P.V., G.C.) and Department of Computer Science and Operations Research (S.G., I.R., G.W.), Université de Montréal, Montréal, Canada; Departments of Radiology (S.I.C., P.B., C.L.R., L.P.B., Y.H.L., E.A., J.M., T.M.A., K.N.V., J.M.L., J.S.B., A.T.) and Pathology (B.N.N.), Centre Hospitalier de l'Université de Montréal (CHUM), 1058 rue Saint-Denis, Montréal, QC, Canada H2X 3J4; Department of Computer Engineering, École Polytechnique de Montréal, Montréal, Canada (S.K.); Mila-Quebec Artificial Intelligence Institute, Montréal, Canada (S.G., B.T., I.R., E.B., G.W.); and Department of Computer Science and Software Engineering, Concordia University, Montréal, Canada (B.T., E.B.)
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5
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Yazdani L, Rafati I, Gesnik M, Nicolet F, Chayer B, Gilbert G, Volniansky A, Olivié D, Giard JM, Sebastiani G, Nguyen BN, Tang A, Cloutier G. Ultrasound Shear Wave Attenuation Imaging for Grading Liver Steatosis in Volunteers and Patients With Non-alcoholic Fatty Liver Disease: A Pilot Study. Ultrasound Med Biol 2023; 49:2264-2272. [PMID: 37482477 DOI: 10.1016/j.ultrasmedbio.2023.06.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 06/26/2023] [Accepted: 06/27/2023] [Indexed: 07/25/2023]
Abstract
OBJECTIVE The aims of the work described here were to assess shear wave attenuation (SWA) in volunteers and patients with non-alcoholic fatty liver disease (NAFLD) and compare its diagnostic performance with that of shear wave dispersion (SWD), magnetic resonance imaging (MRI) proton density fat fraction (PDFF) and biopsy. METHODS Forty-nine participants (13 volunteers and 36 NAFLD patients) were enrolled. Ultrasound and MRI examinations were performed in all participants. Biopsy was also performed in patients. SWA was used to assess histopathology grades as potential confounders. The areas under curves (AUCs) of SWA, SWD and MRI-PDFF were assessed in different steatosis grades by biopsy. Youden's thresholds of SWA were obtained for steatosis grading while using biopsy or MRI-PDFF as the reference standard. RESULTS Spearman's correlations of SWA with histopathology (steatosis, inflammation, ballooning and fibrosis) were 0.89, 0.73, 0.62 and 0.31, respectively. Multiple linear regressions of SWA confirmed the correlation with steatosis grades (adjusted R2 = 0.77, p < 0.001). The AUCs of MRI-PDFF, SWA and SWD were respectively 0.97, 0.99 and 0.94 for S0 versus ≥S1 (p > 0.05); 0.94, 0.98 and 0.78 for ≤S1 versus ≥S2 (both MRI-PDFF and SWA were higher than SWD, p < 0.05); and 0.90, 0.93 and 0.68 for ≤S2 versus S3 (both SWA and MRI-PDFF were higher than SWD, p < 0.05). SWA's Youden thresholds (Np/m/Hz) (sensitivity, specificity) for S0 versus ≥S1, ≤S1 versus ≥S2 and ≤S2 versus S3 were 1.05 (1.00, 0.92), 1.37 (0.96, 0.96) and 1.51 (0.83, 0.87), respectively. These values were 1.16 (1.00, 0.81), 1.49 (0.91, 0.82) and 1.67 (0.87, 0.92) when considering MRI-PDFF as the reference standard. CONCLUSION In this pilot study, SWA increased with increasing steatosis grades, and its diagnostic performance was higher than that of SWD but equivalent to that of MRI-PDFF.
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Affiliation(s)
- Ladan Yazdani
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada; Institute of Biomedical Engineering, Université de Montréal, Montréal, QC, Canada
| | - Iman Rafati
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada; Institute of Biomedical Engineering, Université de Montréal, Montréal, QC, Canada
| | - Marc Gesnik
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Frank Nicolet
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Boris Chayer
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Guillaume Gilbert
- MR Clinical Science, Philips Healthcare Canada, Markham, ON, Canada; Department of Radiology, Radiation Oncology and Nuclear Medicine, Université de Montréal, Montréal, QQ, Canada
| | - Anton Volniansky
- Department of Radiology, Radiation Oncology and Nuclear Medicine, Université de Montréal, Montréal, QQ, Canada
| | - Damien Olivié
- Department of Radiology, Radiation Oncology and Nuclear Medicine, Université de Montréal, Montréal, QQ, Canada
| | | | - Giada Sebastiani
- Division of Gastroenterology and Hepatology, McGill University Health Centre, Montreal, QC, Canada
| | - Bich N Nguyen
- Service of Pathology, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, QC, Canada
| | - An Tang
- Department of Radiology, Radiation Oncology and Nuclear Medicine, Université de Montréal, Montréal, QQ, Canada; Laboratory of Clinical Image Processing, CRCHUM, Montréal, QC, Canada
| | - Guy Cloutier
- Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada; Institute of Biomedical Engineering, Université de Montréal, Montréal, QC, Canada; Department of Radiology, Radiation Oncology and Nuclear Medicine, Université de Montréal, Montréal, QQ, Canada.
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6
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Taslim TH, Hussein AM, Keshri R, Ishibashi JR, Chan TC, Nguyen BN, Liu S, Brewer D, Harper S, Lyons S, Garver B, Dang J, Balachandar N, Jhajharia S, Castillo DD, Mathieu J, Ruohola-Baker H. Stress-induced reversible cell-cycle arrest requires PRC2/PRC1-mediated control of mitophagy in Drosophila germline stem cells and human iPSCs. Stem Cell Reports 2022; 18:269-288. [PMID: 36493777 PMCID: PMC9860083 DOI: 10.1016/j.stemcr.2022.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 11/02/2022] [Accepted: 11/07/2022] [Indexed: 12/13/2022] Open
Abstract
Following acute genotoxic stress, both normal and tumorous stem cells can undergo cell-cycle arrest to avoid apoptosis and later re-enter the cell cycle to regenerate daughter cells. However, the mechanism of protective, reversible proliferative arrest, "quiescence," remains unresolved. Here, we show that mitophagy is a prerequisite for reversible quiescence in both irradiated Drosophila germline stem cells (GSCs) and human induced pluripotent stem cells (hiPSCs). In GSCs, mitofission (Drp1) or mitophagy (Pink1/Parkin) genes are essential to enter quiescence, whereas mitochondrial biogenesis (PGC1α) or fusion (Mfn2) genes are crucial for exiting quiescence. Furthermore, mitophagy-dependent quiescence lies downstream of mTOR- and PRC2-mediated repression and relies on the mitochondrial pool of cyclin E. Mitophagy-dependent reduction of cyclin E in GSCs and in hiPSCs during mTOR inhibition prevents the usual G1/S transition, pushing the cells toward reversible quiescence (G0). This alternative method of G1/S control may present new opportunities for therapeutic purposes.
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Affiliation(s)
- Tommy H Taslim
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Abdiasis M Hussein
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Riya Keshri
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Julien R Ishibashi
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Tung C Chan
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Bich N Nguyen
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Shuozhi Liu
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Daniel Brewer
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Stuart Harper
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Scott Lyons
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Ben Garver
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Jimmy Dang
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Nanditaa Balachandar
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA; Department of Biotechnology, School of Bioengineering, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, India
| | - Samriddhi Jhajharia
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA; Department of Biotechnology, School of Bioengineering, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, India
| | - Debra Del Castillo
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Julie Mathieu
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA; Department of Comparative Medicine, University of Washington, Seattle, WA, USA
| | - Hannele Ruohola-Baker
- Department of Biochemistry, University of Washington, Seattle, WA, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA.
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7
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Destrempes F, Gesnik M, Chayer B, Roy-Cardinal MH, Olivié D, Giard JM, Sebastiani G, Nguyen BN, Cloutier G, Tang A. Quantitative ultrasound, elastography, and machine learning for assessment of steatosis, inflammation, and fibrosis in chronic liver disease. PLoS One 2022; 17:e0262291. [PMID: 35085294 PMCID: PMC8794185 DOI: 10.1371/journal.pone.0262291] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 12/21/2021] [Indexed: 12/12/2022] Open
Abstract
Objective To develop a quantitative ultrasound (QUS)- and elastography-based model to improve classification of steatosis grade, inflammation grade, and fibrosis stage in patients with chronic liver disease in comparison with shear wave elastography alone, using histopathology as the reference standard. Methods This ancillary study to a prospective institutional review-board approved study included 82 patients with non-alcoholic fatty liver disease, chronic hepatitis B or C virus, or autoimmune hepatitis. Elastography measurements, homodyned K-distribution parametric maps, and total attenuation coefficient slope were recorded. Random forests classification and bootstrapping were used to identify combinations of parameters that provided the highest diagnostic accuracy. Receiver operating characteristic (ROC) curves were computed. Results For classification of steatosis grade S0 vs. S1-3, S0-1 vs. S2-3, S0-2 vs. S3, area under the receiver operating characteristic curve (AUC) were respectively 0.60, 0.63, and 0.62 with elasticity alone, and 0.90, 0.81, and 0.78 with the best tested model combining QUS and elastography features. For classification of inflammation grade A0 vs. A1-3, A0-1 vs. A2-3, A0-2 vs. A3, AUCs were respectively 0.56, 0.62, and 0.64 with elasticity alone, and 0.75, 0.68, and 0.69 with the best model. For classification of liver fibrosis stage F0 vs. F1-4, F0-1 vs. F2-4, F0-2 vs. F3-4, F0-3 vs. F4, AUCs were respectively 0.66, 0.77, 0.72, and 0.74 with elasticity alone, and 0.72, 0.77, 0.77, and 0.75 with the best model. Conclusion Random forest models incorporating QUS and shear wave elastography increased the classification accuracy of liver steatosis, inflammation, and fibrosis when compared to shear wave elastography alone.
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Affiliation(s)
- François Destrempes
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada
| | - Marc Gesnik
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada
| | - Boris Chayer
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada
| | - Marie-Hélène Roy-Cardinal
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada
| | - Damien Olivié
- Department of Radiology, Radiation oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada
- Department of Radiology, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Québec, Canada
| | - Jeanne-Marie Giard
- Department of Medicine, Division of Hepatology and Liver Transplantation, Université de Montréal, Montréal, Québec, Canada
| | - Giada Sebastiani
- Department of Medicine, Division of Gastroenterology and Hepatology, McGill University Health Centre (MUHC), Montréal, Québec, Canada
| | - Bich N. Nguyen
- Department of Pathology, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Québec, Canada
- Department of Pathology and Cellular Biology, Université de Montréal, Montréal, Québec, Canada
| | - Guy Cloutier
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada
- Department of Radiology, Radiation oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada
- Institute of Biomedical Engineering, University of Montreal, Montréal, Québec, Canada
- * E-mail: (GC); (AT)
| | - An Tang
- Department of Radiology, Radiation oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada
- Department of Radiology, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Québec, Canada
- Laboratory of Medical Image Analysis, Centre de recherche du Centre hospitalier de l’Université de Montréal (CRCHUM), Montréal, Québec, Canada
- * E-mail: (GC); (AT)
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8
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Bhatt M, Yazdani L, Destrempes F, Allard L, Nguyen BN, Tang A, Cloutier G. Multiparametric in vivo ultrasound shear wave viscoelastography on farm-raised fatty duck livers: human radiology imaging applied to food sciences. Poult Sci 2021; 100:101076. [PMID: 34092345 PMCID: PMC8190504 DOI: 10.1016/j.psj.2021.101076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
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9
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Echelard P, Roy SF, Trinh VQH, Garant MP, Collin Y, Nguyen BN, Geha S. Age, operation time and surgical approach can be used to detect incidental gallbladder carcinoma in cholecystectomy specimens from low-incidence settings. Histopathology 2021; 79:667-673. [PMID: 34061406 DOI: 10.1111/his.14423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 05/17/2021] [Accepted: 05/30/2021] [Indexed: 11/27/2022]
Abstract
AIMS Gallbladders resected for non-neoplastic diseases are systemically examined microscopically to rule out incidental dysplasia and carcinoma. The main aim of this study was to test whether a pre-grossing algorithm can detect incidental gallbladder carcinoma. The secondary aim was to test whether the algorithm can detect high-grade dysplasia. METHODS AND RESULTS A retrospective study of clinical, pathological and radiological findings in cholecystectomy recipients was performed on a test set to develop a classification and regression tree algorithm. Cholecystectomy cases were included; exclusion criteria were age <18 years, missing pathology reports, preoperative suspicion of neoplastic disease, and cholecystectomy for non-gallbladder oncological disease. Five thousand nine hundred and eighty-two cholecystectomies from 2006 to 2018 were included in the study, with 18 cases of incidental gallbladder carcinoma and 11 cases of high-grade dysplasia. Three hundred and ninety controls were randomly selected for the testing set. Patient age, surgical approach, operation duration, dilatation of the biliary tract and gallbladder gross anomalies were statistically significant distinguishing factors in multivariate analysis (P < 0.00-0.026). Unsupervised testing with a conditional inference tree suggested that age, procedure type and operation duration can be used to identify incidental gallbladder carcinoma from controls, whereas high-grade dysplasia also requires grossing parameters to identify half of the cases (5/11). CONCLUSION Readily available clinical parameters and postoperative data can be used to detect incidental gallbladder carcinoma. High-grade dysplasia mostly requires grossing and microscopic examination.
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Affiliation(s)
- Philippe Echelard
- Department of Pathology, University of Sherbrooke, Sherbrooke, Canada
| | - Simon F Roy
- Department of Pathology and Cellular Biology, University of Montreal, Montreal, Quebec, Canada
| | - Vincent Q-H Trinh
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | | | - Yves Collin
- Department of Surgery, University of Sherbrooke, Sherbrooke, Canada
| | - Bich N Nguyen
- Department of Pathology and Cellular Biology, University of Montreal, Montreal, Quebec, Canada
| | - Sameh Geha
- Department of Pathology, University of Sherbrooke, Sherbrooke, Canada
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10
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Bhatt M, Yazdani L, Destrempes F, Allard L, Nguyen BN, Tang A, Cloutier G. Multiparametric in vivo ultrasound shear wave viscoelastography on farm-raised fatty duck livers: human radiology imaging applied to food sciences. Poult Sci 2021; 100:100968. [PMID: 33607316 PMCID: PMC7900601 DOI: 10.1016/j.psj.2020.12.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/14/2020] [Accepted: 12/18/2020] [Indexed: 12/19/2022] Open
Abstract
Nine mulard ducks that were being raised for foie gras (steatosis) production went through in vivo shear wave (SW) elastography imaging of their liver during the force-feeding period to investigate changes in liver tissue characteristics. A total of 4 imaging sessions at an interval of 3 to 4 d were conducted at the farm on each animal. Three ducks were sacrificed at the second, third, and fourth imaging sessions for histopathology analysis of all animals at these time points. Six SW elastography parameters were evaluated: SW speed, SW attenuation, SW dispersion, Young's modulus, viscosity, and shear modulus. Shear waves of different frequencies propagate with different phase velocities. Thus, SW speed and other dependent parameters such as Young's modulus, viscosity, and shear modulus were computed at 2 frequencies: 75 and 202 Hz. Each parameter depicted a statistically significant trend along the force-feeding process (P-values between 0.001 and 0.0001). The fat fraction of the liver increased over the 12-day period of feeding. All parameters increased monotonically over time at 75 Hz, whereas modal relations were seen at 202 Hz. Shear wave dispersion measured between 75 and 202 Hz depicted a plateau from day 5. Based on this validation, proposed imaging methods are aimed to be used in the future on naturally fed ducks and geese.
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Affiliation(s)
- Manish Bhatt
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada H2X 0A9
| | - Ladan Yazdani
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada H2X 0A9; Institute of Biomedical Engineering, University of Montreal, Montréal, Québec, Canada H3C 3J7
| | - François Destrempes
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada H2X 0A9
| | - Louise Allard
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada H2X 0A9
| | - Bich N Nguyen
- Service of Pathology, University of Montreal Hospital (CHUM), Montréal, Québec, Canada H2X 0C1
| | - An Tang
- Institute of Biomedical Engineering, University of Montreal, Montréal, Québec, Canada H3C 3J7; Laboratory of Medical Image Analysis, CRCHUM, Montréal, Québec, Canada H2X 0A9; Department of Radiology, Radio-Oncology and Nuclear Medicine, University of Montreal, Montréal, Québec, Canada H3T 1J4
| | - Guy Cloutier
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, Québec, Canada H2X 0A9; Institute of Biomedical Engineering, University of Montreal, Montréal, Québec, Canada H3C 3J7; Department of Radiology, Radio-Oncology and Nuclear Medicine, University of Montreal, Montréal, Québec, Canada H3T 1J4.
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11
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Zhang H, Léveillé M, Courty E, Gunes A, N Nguyen B, Estall JL. Differences in metabolic and liver pathobiology induced by two dietary mouse models of nonalcoholic fatty liver disease. Am J Physiol Endocrinol Metab 2020; 319:E863-E876. [PMID: 32924526 DOI: 10.1152/ajpendo.00321.2020] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a growing epidemic linked to metabolic disease. The first stage of NAFLD is characterized by lipid accumulation in hepatocytes, but this can progress into nonalcoholic steatohepatitis (NASH), cirrhosis, and hepatocellular carcinoma (HCC). Western diets, high in fats, sugars, and cholesterol, are linked to NAFLD development. Murine models are often used to study NAFLD; however, there remains debate on which diet-induced model best mimics both human disease progression and pathogenesis. In this study, we performed a side-by-side comparison of two popular diet models of murine NAFLD/NASH and associated HCC, a high-fat diet supplemented with 30% fructose water (HFHF) and a Western diet high in cholesterol (WDHC), and these were compared with a common grain-based chow diet (GBD). Mice on both experimental diets developed liver steatosis, and WDHC-fed mice had greater levels of hepatic inflammation and fibrosis than HFHF-fed mice. In contrast, HFHF-fed mice were more obese and developed more severe metabolic syndrome, with less pronounced liver disease. Despite these differences, WDHC-fed and HFHF-fed mice had similar tumor burdens in a model of diet-potentiated liver cancer. Response to diet and resulting phenotypes were generally similar between sexes, albeit delayed in females. This study shows that modest differences in diet can significantly uncouple glucose homeostasis and liver damage. In conclusion, long-term feeding of either HFHF or WDHC is a reliable method to induce NASH and diet-potentiated liver cancer in mice of both sexes; however, the choice of diet involves a trade-off between severity of metabolic syndrome and liver damage.
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Affiliation(s)
- Hannah Zhang
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Mélissa Léveillé
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Department of Medicine, University of Montreal, Montreal, Quebec, Canada
| | - Emilie Courty
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Aysim Gunes
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Bich N Nguyen
- Department of Pathology and Cell Biology, University of Montreal, Montreal, Quebec, Canada
- University of Montreal Health Network (CHUM), Montreal, Quebec Canada
| | - Jennifer L Estall
- Institut de recherches cliniques de Montréal (IRCM), Montreal, Quebec, Canada
- Department of Medicine, University of Montreal, Montreal, Quebec, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
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12
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Gesnik M, Bhatt M, Roy Cardinal MH, Destrempes F, Allard L, Nguyen BN, Alquier T, Giroux JF, Tang A, Cloutier G. In vivo Ultrafast Quantitative Ultrasound and Shear Wave Elastography Imaging on Farm-Raised Duck Livers during Force Feeding. Ultrasound Med Biol 2020; 46:1715-1726. [PMID: 32381381 DOI: 10.1016/j.ultrasmedbio.2020.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 02/05/2020] [Accepted: 03/10/2020] [Indexed: 06/11/2023]
Abstract
Shear wave elastography (speed and dispersion), local attenuation coefficient slope and homodyned-K parametric imaging were used for liver steatosis grading. These ultrasound biomarkers rely on physical interactions between shear and compression waves with tissues at both macroscopic and microscopic scales. These techniques were applied in a context not yet studied with ultrasound imaging, that is, monitoring steatosis of force-fed duck livers from pre-force-fed to foie gras stages. Each estimated feature presented a statistically significant trend along the feeding process (p values <10-3). However, whereas a monotonic increase in the shear wave speed was observed along the process, most quantitative ultrasound features exhibited an absolute maximum value halfway through the process. As the liver fat fraction in foie gras is much higher than that seen clinically, we hypothesized that a change in the ultrasound scattering regime is encountered for high-fat fractions, and consequently, care has to be taken when applying ultrasound biomarkers to grading of severe states of steatosis.
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Affiliation(s)
- Marc Gesnik
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada
| | - Manish Bhatt
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada
| | - Marie-Hélène Roy Cardinal
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada
| | - François Destrempes
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada
| | - Louise Allard
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada
| | - Bich N Nguyen
- Service of Pathology, University of Montreal Hospital (CHUM), Montréal, QC, Canada
| | - Thierry Alquier
- CRCHUM and Montreal Diabetes Research Center, Montréal, QC, Canada; Department of Medicine, University of Montreal, Montréal, QC, Canada
| | - Jean-François Giroux
- Department of Biological Sciences, University of Quebec in Montreal, Montréal, QC, Canada
| | - An Tang
- Service of Radiology, University of Montreal Hospital (CHUM), Montréal, QC, Canada; Department of Radiology, Radio-Oncology and Nuclear Medicine, University of Montreal, Montréal, QC, Canada; Laboratory of Medical Image Analysis, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada; Institute of Biomedical Engineering, University of Montreal, Montréal, QC, Canada
| | - Guy Cloutier
- Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), Montréal, QC, Canada; Department of Radiology, Radio-Oncology and Nuclear Medicine, University of Montreal, Montréal, QC, Canada; Institute of Biomedical Engineering, University of Montreal, Montréal, QC, Canada.
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13
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Chapuy L, Bsat M, Rubio M, Harvey F, Motta V, Schwenter F, Wassef R, Richard C, Deslandres C, Nguyen BN, Soucy G, Hacohen N, Fritz J, Villani AC, Mehta H, Sarfati M. Transcriptomic Analysis and High-dimensional Phenotypic Mapping of Mononuclear Phagocytes in Mesenteric Lymph Nodes Reveal Differences Between Ulcerative Colitis and Crohn's Disease. J Crohns Colitis 2020; 14:393-405. [PMID: 31541232 PMCID: PMC7068244 DOI: 10.1093/ecco-jcc/jjz156] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
BACKGROUND AND AIMS Crohn's disease [CD] and ulcerative colitis [UC] are distinct forms of inflammatory bowel disease. Heterogeneity of HLA-DR+SIRPα + mononuclear phagocytes [MNPs], including macrophages [MΦ], monocyte-derived [Mono] cells, and dendritic cells [DCs], was reported in gut tissue but not yet investigated in mesenteric lymph nodes [MLNs] of IBD patients. We here compared the phenotype, function, and molecular profile of HLA-DR+SIRPα + MNPs in CD and UC MLNs. METHODS Cell distribution, morphology, immune function, and transcriptomic [bulk RNAseq] and high-dimensional protein expression profiles [CyTOF] of HLA-DR+SIRPα + MNPs were examined in MLNs of UC [n = 14], CD [n = 35], and non-IBD [n = 12] patients. RESULTS Elevated frequencies of CD14+CD64+CD163+ [Mono/MΦ-like] MNPs displaying monocyte/MΦ morphology and phagocytic function were a distinct feature of UC MLNs. In CD, the proportion of CD14-CD64-CD163- [DC-like] cells was augmented relative to Mono/MΦ-like cells; DC-like cells drove naïve T cell proliferation, Th1 polarisation, and Th17 TCM plasticity. Gene expression profile corroborated the nature of DC-like cells, best represented by BTLA, SERPINF, IGJ and, of Mono/MΦ-like cells, defined by CD163, MARCO, MAFB, CD300E, S100A9 expression. CyTOF analysis showed that CD123+ plasmacytoid cells predominated over conventional DCs in DC-like cells. Four CD163+ clusters were revealed in Mono/MΦ-like cells, two of which were enriched in MARCO-CD68dimHLA-DRdim monocyte-like cells and MARCOhiCD68hiHLA-DRhi Mɸ, whose proportion increased in UC relative to CD. CONCLUSIONS Defining the landscape of MNPs in MLNs provided evidence for expansion of CD163+ Mono/MΦ-like cells in UC only, highlighting a distinction between UC and CD, and thus the potential contribution of monocyte-like cells in driving colitis.
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Affiliation(s)
- Laurence Chapuy
- Immunoregulation Laboratory, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
| | - Marwa Bsat
- Immunoregulation Laboratory, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
| | - Manuel Rubio
- Immunoregulation Laboratory, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
| | - François Harvey
- Department of Biomedical Informatics, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
| | - Vinicius Motta
- McGill Goodman Research Center, McGill University, Montréal, QC, Canada
| | - Frank Schwenter
- Digestive Surgery Department, Centre Hospitalier de l’Université de Montréal [CHUM], Montréal, QC, Canada
| | - Ramses Wassef
- Digestive Surgery Department, Centre Hospitalier de l’Université de Montréal [CHUM], Montréal, QC, Canada
| | - Carole Richard
- Digestive Surgery Department, Centre Hospitalier de l’Université de Montréal [CHUM], Montréal, QC, Canada
| | - Colette Deslandres
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, CHU Sainte-Justine, Université de Montreal, QC, Canada
| | - Bich N Nguyen
- Pathology Department, Centre Hospitalier de l’Université de Montréal [CHUM], Montréal, QC, Canada
| | - Geneviève Soucy
- Pathology Department, Centre Hospitalier de l’Université de Montréal [CHUM], Montréal, QC, Canada
| | - Nir Hacohen
- Broad Institute of MIT and Harvard, Cambridge, MA USA
| | - Jorge Fritz
- Department of Microbiology and Immunology, McGill University, Montréal, Qc, Canada
| | - Alexandra-Chloé Villani
- Broad Institute of MIT and Harvard, Cambridge, MA USA
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Boston, MA, USA
| | - Heena Mehta
- Immunoregulation Laboratory, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
| | - Marika Sarfati
- Immunoregulation Laboratory, Centre de Recherche du Centre Hospitalier de l’Université de Montréal [CRCHUM], Montréal, QC, Canada
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Benoit P, Meehan ME, Chapdelaine H, Vincent C, Sirdar E, Savard P, Nguyen BN, Luong ML. Hiding in plain sight: A case of fever, rash, and jaundice. J Assoc Med Microbiol Infect Dis Can 2019; 4:248-251. [PMID: 36339285 PMCID: PMC9612806 DOI: 10.3138/jammi.2019-0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 07/11/2019] [Indexed: 06/16/2023]
Abstract
A 25-year-old man presented to the emergency department with a 3-day history of fever, anorexia, jaundice, and a generalized skin eruption. His liver function tests showed marked cholestatic and cytolytic abnormalities without liver insufficiency. A liver biopsy was performed, and morphology with routine stains was considered non-specific. Because of the dermatological findings, the non-specific biopsy morphology, and the absence of an identified infectious etiology, a diagnosis of Kawasaki disease was presumed. However, additional colorations on liver biopsy with Warthin-Starry stain revealed multiple thin and coiled microorganisms compatible with spirochetes. His serology for leptospirosis was found to be positive for IgM, supporting the diagnosis of acute leptospirosis with liver involvement. Our case illustrates the diagnostic challenge of leptospirosis and highlights the utility of conventional laboratory tests to confirm the diagnosis. Exceptionally, Warthin-Starry stain allowed the identification of leptospires in liver biopsy and confirmed liver involvement of systemic leptospirosis.
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Affiliation(s)
- Patrick Benoit
- Department of Medicine, Service of Internal Medicine, Université de Montréal, Montréal, Québec, Canada;
| | - Marie-Eve Meehan
- Department of Pathology and Cellular Biology, Université de Montréal, Montréal, Québec, Canada;
| | - Hugo Chapdelaine
- Department of Medicine, Service of Clinical Immunology and Allergy, Université de Montréal, Montréal, Québec, Canada;
| | - Catherine Vincent
- Department of Medicine, Service of Hepatology, Université de Montréal, Montréal, Québec, Canada;
| | - Emmanuel Sirdar
- Department of Medicine, Service of Internal Medicine, Université de Montréal, Montréal, Québec, Canada;
| | - Patrice Savard
- Department of Medicine, Service of Infectious Diseases, Université de Montréal, Montréal, Québec, Canada
| | - Bich N Nguyen
- Department of Pathology and Cellular Biology, Université de Montréal, Montréal, Québec, Canada;
| | - Me-Linh Luong
- Department of Medicine, Service of Infectious Diseases, Université de Montréal, Montréal, Québec, Canada
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Lefebvre T, Petitclerc L, Hébert M, Bilodeau L, Sebastiani G, Olivié D, Gao ZH, Sylvestre MP, Cloutier G, Nguyen BN, Gilbert G, Tang A. MRI cine-tagging of cardiac-induced motion for noninvasive staging of liver fibrosis. J Magn Reson Imaging 2019; 51:1570-1580. [PMID: 31605412 DOI: 10.1002/jmri.26935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 09/05/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND MR elastography is a noninvasive technique that provides high diagnostic accuracy for the staging of liver fibrosis; however, it requires external hardware and mainly assesses the right lobe. PURPOSE To evaluate the diagnostic performance of MRI cine-tagging for staging fibrosis in the left liver lobe, using biopsy as the reference standard. STUDY TYPE Institutional Review Board (IRB)-approved two-center prospective study. POPULATION Seventy-six patients with chronic liver disease who underwent an MRI cine-tagging examination and a liver biopsy within a 6-week interval. FIELD STRENGTH/SEQUENCE 2D-GRE multislice sequence at 3.0T with spatial modulation of the magnetization preparation sequence and peripheral pulse-wave triggering on two coronal slices chosen underneath the heart apex to capture maximal deformation with consecutive breath-holds adapted to patient cardiac frequency. ASSESSMENT A region of interest was selected in the liver close to the heart apex. Maximal strain was evaluated with the harmonic phase (HARP) technique. STATISTICAL TESTS Spearman's correlation, Kruskal-Wallis test, Mann-Whitney U-test, and receiver operating characteristic (ROC) analysis were performed. RESULTS Liver strain measured on tagged images decreased with higher histological fibrosis stage (ρ = -0.68, P < 0.0001). Strain values were significantly different between all fibrosis stages (P < 0.0001), and between groups of fibrosis stages ≤F3 vs. F4 (P < 0.05). Areas under the ROC curves were 0.95 (95% confidence interval: 0.89-1.00) to distinguish fibrosis stages F0 vs. F4, 0.81 (0.70-0.92) for stages F0 vs. ≥F1, 0.84 (0.76-0.93) for stages ≤F1 vs. ≥F2, 0.86 (0.78-0.94) for stages ≤F2 vs. ≥F3, and 0.87 (0.77-0.96) for stages ≤F3 vs. F4. DATA CONCLUSION MRI cine-tagging is a promising technique for measuring liver strain without additional elastography hardware. It could be used to assess the left liver lobe as a complement to current techniques assessing the right lobe. LEVEL OF EVIDENCE 1 Technical Efficacy: 3 J. Magn. Reson. Imaging 2020;51:1570-1580.
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Affiliation(s)
- Thierry Lefebvre
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada.,Medical Physics Unit, McGill University, Montréal, Québec, Canada
| | - Léonie Petitclerc
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada.,C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - Mélanie Hébert
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada
| | - Laurent Bilodeau
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada
| | - Giada Sebastiani
- Department of Medicine, Division of Gastroenterology and Hepatology, McGill University Health Centre (MUHC), Montréal, Québec, Canada
| | - Damien Olivié
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Zu-Hua Gao
- Department of Pathology, McGill University, Montréal, Québec, Canada
| | - Marie-Pierre Sylvestre
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada.,Department of Social and Preventive Medicine, École de santé publique de l'Université de Montréal (ESPUM), Montréal, Québec, Canada
| | - Guy Cloutier
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Institute of Biomedical Engineering, Université de Montréal, Montréal, Québec, Canada.,Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada
| | - Bich N Nguyen
- Service of Pathology, Centre hospitalier de l'Université de Montréal (CHUM), Montréal, Québec, Canada
| | - Guillaume Gilbert
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,MR Clinical Science, Philips Healthcare Canada, Montréal, Québec, Canada
| | - An Tang
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada.,Institute of Biomedical Engineering, Université de Montréal, Montréal, Québec, Canada
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Lefebvre T, Wartelle-Bladou C, Wong P, Sebastiani G, Giard JM, Castel H, Murphy-Lavallée J, Olivié D, Ilinca A, Sylvestre MP, Gilbert G, Gao ZH, Nguyen BN, Cloutier G, Tang A. Prospective comparison of transient, point shear wave, and magnetic resonance elastography for staging liver fibrosis. Eur Radiol 2019; 29:6477-6488. [PMID: 31278577 DOI: 10.1007/s00330-019-06331-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 05/16/2019] [Accepted: 06/13/2019] [Indexed: 02/08/2023]
Abstract
OBJECTIVES To perform head-to-head comparisons of the feasibility and diagnostic performance of transient elastography (TE), point shear-wave elastography (pSWE), and magnetic resonance elastography (MRE). METHODS This prospective, cross-sectional, dual-center imaging study included 100 patients with known or suspected chronic liver disease caused by hepatitis B or C virus, nonalcoholic fatty liver disease, or autoimmune hepatitis identified between 2014 and 2018. Liver stiffness measured with the three elastographic techniques was obtained within 6 weeks of a liver biopsy. Confounding effects of inflammation and steatosis on association between fibrosis and liver stiffness were assessed. Obuchowski scores and AUCs for staging fibrosis were evaluated and the latter were compared using the DeLong method. RESULTS TE, pSWE, and MRE were technically feasible and reliable in 92%, 79%, and 91% subjects, respectively. At univariate analysis, liver stiffness measured by all techniques increased with fibrosis stages and inflammation and decreased with steatosis. For classification of dichotomized fibrosis stages, the AUCs were significantly higher for distinguishing stages F0 vs. ≥ F1 with MRE than with TE (0.88 vs. 0.71; p < 0.05) or pSWE (0.88 vs. 0.73; p < 0.05), and for distinguishing stages ≤ F1 vs. ≥ F2 with MRE than with TE (0.85 vs. 0.75; p < 0.05). TE, pSWE, and MRE Obuchowski scores for staging fibrosis stages were respectively 0.89 (95% CI 0.85-0.93), 0.90 (95% CI 0.85-0.94), and 0.94 (95% CI 0.91-0.96). CONCLUSION MRE provided a higher diagnostic performance than TE and pSWE for staging early stages of liver fibrosis. TRIAL REGISTRATION NCT02044523 KEY POINTS: • The technical failure rate was similar between MRE and US-based elastography techniques. • Liver stiffness measured by MRE and US-based elastography techniques increased with fibrosis stages and inflammation and decreased with steatosis. • MRE provided a diagnostic accuracy higher than US-based elastography techniques for staging of early stages of histology-determined liver fibrosis.
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Affiliation(s)
- Thierry Lefebvre
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada.,Medical Physics Unit, McGill University, Montreal, Canada
| | - Claire Wartelle-Bladou
- Department of Medicine, Division of Hepatology and Liver Transplantation, Université de Montréal, Montreal, Canada
| | - Philip Wong
- Department of Medicine, Division of Gastroenterology and Hepatology, McGill University Health Centre (MUHC), Montreal, Canada
| | - Giada Sebastiani
- Department of Medicine, Division of Gastroenterology and Hepatology, McGill University Health Centre (MUHC), Montreal, Canada
| | - Jeanne-Marie Giard
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada.,Department of Medicine, Division of Hepatology and Liver Transplantation, Université de Montréal, Montreal, Canada
| | - Hélène Castel
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada.,Department of Medicine, Division of Hepatology and Liver Transplantation, Université de Montréal, Montreal, Canada
| | - Jessica Murphy-Lavallée
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada
| | - Damien Olivié
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada
| | - André Ilinca
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada.,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada
| | - Marie-Pierre Sylvestre
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada.,Department of Social and Preventive Medicine, École de santé publique de l'Université de Montréal (ESPUM), Montreal, Canada
| | - Guillaume Gilbert
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada.,MR Clinical Science, Philips Healthcare Canada, Markham, Canada
| | - Zu-Hua Gao
- Department of Pathology, McGill University, Montreal, Canada
| | - Bich N Nguyen
- Service of Pathology, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, Canada
| | - Guy Cloutier
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada.,Institute of Biomedical Engineering, Université de Montréal, Montreal, Canada.,Laboratory of Biorheology and Medical Ultrasonics (LBUM), Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada
| | - An Tang
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montreal, Canada. .,Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montreal, Canada. .,Institute of Biomedical Engineering, Université de Montréal, Montreal, Canada.
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Tang A, Destrempes F, Kazemirad S, Garcia-Duitama J, Nguyen BN, Cloutier G. Quantitative ultrasound and machine learning for assessment of steatohepatitis in a rat model. Eur Radiol 2018; 29:2175-2184. [DOI: 10.1007/s00330-018-5915-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/29/2018] [Accepted: 11/23/2018] [Indexed: 12/13/2022]
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18
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Arora AA, Nguyen BN, Le TT, Vo HV. Using 2D Gait Motion Analysis to Test the Efficacy of the Mercer Universal Prosthetic Device. Arch Phys Med Rehabil 2018. [DOI: 10.1016/j.apmr.2018.07.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Therrien A, El Haffaf Z, Wartelle-Bladou C, Côté-Daigneault J, Nguyen BN. Langerhans cell histiocytosis presenting as Crohn's disease: a case report. Int J Colorectal Dis 2018; 33:1501-1504. [PMID: 29737419 DOI: 10.1007/s00384-018-3066-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/24/2018] [Indexed: 02/04/2023]
Abstract
PURPOSE We describe an exceptional case of Langerhans cell histiocytosis (LCH) that presented as Crohn's disease and primary sclerosing cholangitis. METHODS The patient's clinical, endoscopic, and histologic data from the Centre Hospitalier de l'Universite de Montreal were reviewed, as well as the literature on LCH involving the digestive tract and the liver, with a focus on the similarities with Crohn's disease and primary sclerosing cholangitis. RESULTS A 39 years-old man first presented with anal fissures and deep punctiform colonic ulcers. Histologic assessment of colon biopsies showed chronic active colitis, consistent with Crohn's disease. Mild cholestasis and endoscopic retrograde cholangiopancreatography (ERCP) showing multiple intra and extrahepatic biliary tract strictures also led to a diagnosis of sclerosing cholangitis. Perianal disease progressed despite conventional treatment with antibiotics and infliximab. Subsequent discovery of non-Langerhans cutaneous xanthogranulomas and panhypopituitarism raised the suspicion of LCH, and a second review of colon biopsies ultimately led to the diagnosis, with the identification of Langerhans cells depicting elongated, irregular nuclei with nuclear grooves as well as immunohistochemical reactivity for S100, CD1a and vimentin. BRAF V600E mutation was detected afterwards by DNA sequencing of a bile duct sample. CONCLUSION LCH may mimic inflammatory bowel disease (IBD) and must be suspected in the presence of other suggestive clinical signs, or when there is failure of conventional IBD treatment.
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Affiliation(s)
- Amelie Therrien
- Department of Medicine, Division of Gastroenterology, Centre Hospitalier de l'Universite de Montreal, 1051 rue Sanguinet, Montreal, QC, H2X 3E4, Canada.
| | - Zaki El Haffaf
- Department of Medicine, Division of Genetic Medicine, Centre Hospitalier de l'Universite de Montreal, Tour Viger, 900 rue St-Denis, Montreal, QC, H2X 0A9, Canada
| | - Claire Wartelle-Bladou
- Department of Medicine, Division of Hepatology, Centre Hospitalier de l'Universite de Montreal, 1051 rue Sanguinet, Montreal, QC, H2X 3E4, Canada
| | - Justin Côté-Daigneault
- Department of Medicine, Division of Gastroenterology, Centre Hospitalier de l'Universite de Montreal, 1051 rue Sanguinet, Montreal, QC, H2X 3E4, Canada
| | - Bich N Nguyen
- Department of Pathology, Centre Hospitalier de l'Universite de Montreal, 1100 rue Sanguinet, Pavillon F, Montreal, QC, H2X 0C2, Canada
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20
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Kazemirad S, Zhang E, Nguyen BN, Bodson-Clermont P, Destrempes F, Trudel D, Cloutier G, Tang A. Detection of Steatohepatitis in a Rat Model by Using Spectroscopic Shear-Wave US Elastography. Radiology 2017; 282:726-733. [DOI: 10.1148/radiol.2016160308] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Siavash Kazemirad
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - Eric Zhang
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - Bich N. Nguyen
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - Paule Bodson-Clermont
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - François Destrempes
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - Dominique Trudel
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - Guy Cloutier
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
| | - An Tang
- From the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Montreal, Quebec, Canada (S.K., E.Z., P.B.C., F.D., D.T., G.C., A.T.); Laboratory of Biorheology and Medical Ultrasonics (LBUM), Montreal, Quebec, Canada (S.K., E.Z., F.D., G.C.); Dept of Pathology, Centre Hospitalier de l’Université de Montréal (CHUM), Montreal, Quebec, Canada (B.N.N., D.T.); Dept of Pathology and Cellular Biology, Université de Montréal, Montreal, Quebec, Canada (B.N.N., D.T.); Inst of Biomedical
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Besse-Patin A, Léveillé M, Oropeza D, Nguyen BN, Prat A, Estall JL. Estrogen Signals Through Peroxisome Proliferator-Activated Receptor-γ Coactivator 1α to Reduce Oxidative Damage Associated With Diet-Induced Fatty Liver Disease. Gastroenterology 2017; 152:243-256. [PMID: 27658772 DOI: 10.1053/j.gastro.2016.09.017] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 09/14/2016] [Accepted: 09/15/2016] [Indexed: 12/25/2022]
Abstract
BACKGROUND & AIMS Inefficient fatty acid oxidation in mitochondria and increased oxidative damage are features of non-alcoholic fatty liver disease (NAFLD). In rodent models and patients with NAFLD, hepatic expression of peroxisome proliferator-activated receptor-γ (PPARG) coactivator 1α (PPARGC1A or PGC1A) is inversely correlated with liver fat and disease severity. A common polymorphism in this gene (rs8192678, encoding Gly482Ser) has been associated with NAFLD. We investigated whether reduced expression of PGC1A contributes to development of NAFLD using mouse models, primary hepatocytes, and human cell lines. METHODS HepG2 cells were transfected with variants of PPARGC1A and protein and messenger RNA levels were measured. Mice with liver-specific hemizygous or homozygous disruption of Ppargc1a (Ppargc1af/+Alb-cre+/0 and Ppargc1af/f Alb-cre+/0 mice, respectively) were fed regular chow (control) or a high-fat diet supplemented with 30% d-fructose in drinking water (obesogenic diet) for 25-33 weeks. Liver tissues were analyzed by histology and by immunoblotting. Primary hepatocytes were analyzed for insulin signaling, reactive oxygen species, and estrogen response. Luciferase reporter expression was measured in transfected H2.35 cells expressing an estrogen receptor reporter gene, estrogen receptor 1, and/or PGC1A/B. RESULTS The serine 482 variant of the human PGC1A protein had a shorter half-life than the glycine 482 variant when expressed in HepG2 cells. Liver tissues from mice with liver-specific hemizygous disruption of Ppargc1a placed on an obesogenic diet expressed increased markers of inflammation and fibrosis and decreased levels of antioxidant enzymes compared with the Ppargc1a+/+ on the same diet. Oxidative damage was observed in livers from Ppargc1af/+Alb-cre+/0 mice of each sex, in a cell-autonomous manner, but was greater in livers from the female mice. Expression of PGC1A in H2.35 cells coactivated estrogen receptor 1 and was required for estrogen-dependent expression of genes that encode antioxidant proteins. These findings could account for the increased liver damage observed in female Ppargc1af/+Alb-cre+/0 mice; while, compensatory increases in PPARG coactivator 1β could prevent oxidative damage associated with complete loss of PGC1A expression in Ppargc1af/fAlb-cre+/0 female mice. CONCLUSIONS In mice, loss of estrogen signaling contributes to oxidative damage caused by low levels of PGC1A in liver, exacerbating steatohepatitis associated with diets high in fructose and fat.
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Affiliation(s)
- Aurèle Besse-Patin
- Institut de Recherches Cliniques de Montreal, Montreal, Québec, Canada; Department of Medicine, University of Montreal, Montreal, Québec, Canada
| | - Mélissa Léveillé
- Institut de Recherches Cliniques de Montreal, Montreal, Québec, Canada; Department of Medicine, University of Montreal, Montreal, Québec, Canada
| | - Daniel Oropeza
- Institut de Recherches Cliniques de Montreal, Montreal, Québec, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, Québec, Canada
| | - Bich N Nguyen
- Department of Pathology and Cell Biology, University of Montreal, Montreal, Québec, Canada; University of Montreal Health Network, Montreal, Québec, Canada
| | - Annik Prat
- Laboratory of Biochemical Neuroendocrinology, Institut de Recherches Cliniques de Montreal, Montreal, Québec, Canada
| | - Jennifer L Estall
- Institut de Recherches Cliniques de Montreal, Montreal, Québec, Canada; Department of Medicine, University of Montreal, Montreal, Québec, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, Québec, Canada.
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Koppe L, Nyam E, Vivot K, Manning Fox JE, Dai XQ, Nguyen BN, Trudel D, Attané C, Moullé VS, MacDonald PE, Ghislain J, Poitout V. Urea impairs β cell glycolysis and insulin secretion in chronic kidney disease. J Clin Invest 2016; 126:3598-612. [PMID: 27525435 DOI: 10.1172/jci86181] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 06/24/2016] [Indexed: 12/25/2022] Open
Abstract
Disorders of glucose homeostasis are common in chronic kidney disease (CKD) and are associated with increased mortality, but the mechanisms of impaired insulin secretion in this disease remain unclear. Here, we tested the hypothesis that defective insulin secretion in CKD is caused by a direct effect of urea on pancreatic β cells. In a murine model in which CKD is induced by 5/6 nephrectomy (CKD mice), we observed defects in glucose-stimulated insulin secretion in vivo and in isolated islets. Similarly, insulin secretion was impaired in normal mouse and human islets that were cultured with disease-relevant concentrations of urea and in islets from normal mice treated orally with urea for 3 weeks. In CKD mouse islets as well as urea-exposed normal islets, we observed an increase in oxidative stress and protein O-GlcNAcylation. Protein O-GlcNAcylation was also observed in pancreatic sections from CKD patients. Impairment of insulin secretion in both CKD mouse and urea-exposed islets was associated with reduced glucose utilization and activity of phosphofructokinase 1 (PFK-1), which could be reversed by inhibiting O-GlcNAcylation. Inhibition of O-GlcNAcylation also restored insulin secretion in both mouse models. These results suggest that insulin secretory defects associated with CKD arise from elevated circulating levels of urea that increase islet protein O-GlcNAcylation and impair glycolysis.
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Hassan GM, Paquin SC, Albadine R, Gariépy G, Soucy G, Nguyen BN, Sahai AV. Endoscopic ultrasound-guided FNA of pelvic lesions: A large single-center experience. Cancer Cytopathol 2016; 124:836-841. [PMID: 27448147 DOI: 10.1002/cncy.21756] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 04/29/2016] [Accepted: 05/20/2016] [Indexed: 11/08/2022]
Abstract
BACKGROUND Pelvic endoscopic ultrasound-guided fine-needle aspiration (PEUS-FNA) of rectal or perirectal lesions is safe, minimally invasive, and well tolerated. It provides valuable information, which can greatly influence patient management. Herein, the authors present what to their knowledge is the largest series to date of PEUS-FNA. METHODS PEUS-FNA specimens were retrieved from the archives of the study institution from January 2001 to March 2015. Only patients with solid pelvic lesions were examined. The cytopathology findings, immunohistochemistry, corresponding histology, and clinical data were collected. For analysis of accuracy, atypical or suspicious results were classified as "negative." The sensitivity and specificity of PEUS-FNA were calculated in a subset of patients with available surgical pathology. RESULTS A total of 127 cases meeting the current study criteria were obtained from patients who underwent PEUS-FNA at the study institution between January 2001 and March 2015. The mean age of the patients was 60 years, and 53% were female. Pelvic lesions were comprised of 72% masses and 28% lymph nodes, with a mean mass diameter of 27.38 mm (range, 5-100 mm). PEUS-FNA was positive for malignancy in 45% of cases, atypical/suspicious in 4.7% of cases, and negative for malignancy in 50.3% of cases. Surgical pathology was available for 44 patients. PEUS-FNA demonstrated 89.3% sensitivity, 100% specificity, a diagnostic accuracy of 93.2%, a positive predictive value of 100%, and a negative predictive value of 84.2%. No complications were noted. CONCLUSIONS PEUS-FNA is safe and effective for the investigation of pelvic lesions. Cancer Cytopathol 2016;124:836-41. © 2016 American Cancer Society.
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Affiliation(s)
- Galab M Hassan
- Department of Gastroenterology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Sarto C Paquin
- Department of Gastroenterology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Roula Albadine
- Department of Pathology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Gilles Gariépy
- Department of Pathology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Geneviève Soucy
- Department of Pathology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Bich N Nguyen
- Department of Pathology, Montreal University Medical Center, Montreal, Quebec, Canada
| | - Anand V Sahai
- Department of Gastroenterology, Montreal University Medical Center, Montreal, Quebec, Canada
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Chastre A, Bélanger M, Nguyen BN, Butterworth RF. Lipopolysaccharide precipitates hepatic encephalopathy and increases blood-brain barrier permeability in mice with acute liver failure. Liver Int 2014; 34:353-61. [PMID: 23910048 DOI: 10.1111/liv.12252] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/16/2013] [Accepted: 05/31/2013] [Indexed: 12/25/2022]
Abstract
BACKGROUND & AIMS Acute liver failure (ALF) is frequently complicated by infection leading to precipitation of central nervous system complications such as hepatic encephalopathy (HE) and increased mortality. There is evidence to suggest that when infection occurs in ALF patients, the resulting pro-inflammatory mechanisms may be amplified that could, in turn, have a major impact on blood-brain barrier (BBB) function. The aim of this study was to investigate the role of endotoxemia on the progression of encephalopathy in relation to BBB permeability during ALF. METHODS Adult male C57-BL6 mice with ALF resulting from azoxymethane-induced toxic liver injury were administered trace amounts of the endotoxin component lipopolysaccharide (LPS). Effects on the magnitude of the systemic inflammatory response, liver pathology and BBB integrity were measured as a function of progression of HE, defined as time to loss of corneal reflex (coma). RESULTS Lipopolysaccharide caused additional two- to seven-fold (P < 0.001) increases in circulating pro-inflammatory cytokines (TNF-α, IL-1β, IL-6), worsening liver pathology and associated increases of circulating transaminases as well as increased hyperammonaemia consistent with a further loss of viable hepatocytes. LPS treatment of ALF mice led to a rapid precipitation of hepatic coma and the BBB became permeable to the 25-kDa protein immunoglobulin G (IgG). This extravasation of IgG was accompanied by ignificant up-regulation of matrix metalloproteinase-9 (MMP-9), an endopeptidase known to modulate opening of the BBB in a wide range of neurological disorders. CONCLUSIONS These findings represent the first direct evidence of inflammation-related BBB permeability changes in ALF.
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Affiliation(s)
- Anne Chastre
- Neuroscience Research Unit, Saint-Luc Hospital, CRCHUM, Montreal, QC, Canada
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Gagnon MF, Nguyen BN, Olney HJ, Lemieux B. Vanishing bile duct syndrome arising in a patient with T-cell-rich large B-cell lymphoma. J Clin Oncol 2013; 31:e357-9. [PMID: 23733773 DOI: 10.1200/jco.2012.46.7787] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Chastre A, Bélanger M, Beauchesne E, Nguyen BN, Desjardins P, Butterworth RF. Inflammatory cascades driven by tumor necrosis factor-alpha play a major role in the progression of acute liver failure and its neurological complications. PLoS One 2012; 7:e49670. [PMID: 23166746 PMCID: PMC3499491 DOI: 10.1371/journal.pone.0049670] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 10/12/2012] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND/AIMS Acute liver failure (ALF) due to ischemic or toxic liver injury is a clinical condition that results from massive loss of hepatocytes and may lead to hepatic encephalopathy (HE), a serious neuropsychiatric complication. Although increased expression of tumor necrosis factor-alpha (TNF-α) in liver, plasma and brain has been observed, conflicting results exist concerning its roles in drug-induced liver injury and on the progression of HE. The present study aimed to investigate the therapeutic value of etanercept, a TNF-α neutralizing molecule, on the progression of liver injury and HE in mice with ALF resulting from azoxymethane (AOM) hepatotoxicity. METHODS/PRINCIPAL FINDINGS Mice were administered saline or etanercept (10 mg/kg; i.p.) 30 minutes prior to, or up to 6 h after AOM. Etanercept-treated ALF mice were sacrificed in parallel with vehicle-treated comatose ALF mice and controls. AOM induced severe hepatic necrosis, leading to HE, and etanercept administered prior or up to 3 h after AOM significantly delayed the onset of coma stages of HE. Etanercept pretreatment attenuated AOM-induced liver injury, as assessed by histological examination, plasma ammonia and transaminase levels, and by hepatic glutathione content. Peripheral inflammation was significantly reduced by etanercept as shown by decreased plasma IL-6 (4.1-fold; p<0.001) and CD40L levels (3.7-fold; p<0.001) compared to saline-treated ALF mice. Etanercept also decreased IL-6 levels in brain (1.2-fold; p<0.05), attenuated microglial activation (assessed by OX-42 immunoreactivity), and increased brain glutathione concentrations. CONCLUSIONS These results indicate that systemic sequestration of TNF-α attenuates both peripheral and cerebral inflammation leading to delayed progression of liver disease and HE in mice with ALF due to toxic liver injury. These results suggest that etanercept may provide a novel therapeutic approach for the management of ALF patients awaiting liver transplantation.
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Affiliation(s)
- Anne Chastre
- Neuroscience Research Unit, Hôpital Saint-Luc, CRCHUM, Montreal, Canada
| | - Mireille Bélanger
- Neuroscience Research Unit, Hôpital Saint-Luc, CRCHUM, Montreal, Canada
| | | | - Bich N. Nguyen
- Département de pathologie, Hôpital Saint-Luc, CHUM, Montreal, Canada
| | - Paul Desjardins
- Neuroscience Research Unit, Hôpital Saint-Luc, CRCHUM, Montreal, Canada
| | - Roger F. Butterworth
- Neuroscience Research Unit, Hôpital Saint-Luc, CRCHUM, Montreal, Canada
- * E-mail:
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Bourbonnais E, Raymond VA, Ethier C, Nguyen BN, El-Leil MS, Meloche S, Bilodeau M. Liver fibrosis protects mice from acute hepatocellular injury. Gastroenterology 2012; 142:130-139.e4. [PMID: 21945831 DOI: 10.1053/j.gastro.2011.09.033] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 08/26/2011] [Accepted: 09/12/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Development of fibrosis is part of the pathophysiologic process of chronic liver disease. Although it is considered deleterious, it also represents a form of tissue repair. Deposition of extracellular matrix changes the cellular environment of the liver; we investigated whether it increases resistance to noxious stimuli and the role of changes in intracellular signaling to hepatocytes in mediating this effect. METHODS Primary cultures of mouse hepatocytes were exposed to type I collagen (COL1); cell injury was assessed by morphologic and biochemical criteria. The expression of Bcl-2 family members was evaluated by immunoblot analyses. Activation of extracellular signal-regulated kinase (ERK) was assessed using phospho-specific antibodies. Liver fibrosis was induced by repeated administration of thioacetamide or carbon tetrachloride to mice; mice were then exposed to Fas antibodies. RESULTS Hepatocytes exposed to COL1 were more resistant to a variety of hepatotoxins, in a dose-dependent manner, and had lower levels of Bad, Bid, and Bax proapoptotic proteins compared with control hepatocytes. Activation of ERK1/2 was stronger and quicker in hepatocytes exposed to COL1. The MEK1/2 inhibitors U0126 and PD98059 reversed the protective effects of COL1 and the decrease in proapoptotic proteins. Hepatocytes isolated from ERK1(-/-) mice were insensitive to the protective effect of COL1. Fibrotic livers from wild-type mice had high levels of phospho-ERK1 and were resistant to Fas-induced cell death. ERK1(-/-) mice lost this effect. CONCLUSIONS Production of COL1 during liver fibrosis induces a hepatoprotective response that is mediated by activation of ERK1 signaling.
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Affiliation(s)
- Eric Bourbonnais
- Laboratoire d'Hépatologie Cellulaire du Centre de Recherche du CHUM-Hôpital Saint-Luc, Montréal, Québec, Canada
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Faraji H, Nguyen BN, Mai KT. Renal epithelioid angiomyolipoma: a study of six cases and a meta-analytic study. Development of criteria for screening the entity with prognostic significance. Histopathology 2010; 55:525-34. [PMID: 19912358 DOI: 10.1111/j.1365-2559.2009.03420.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
AIMS Renal epithelioid angiomyolipoma (EAML) is only described in case reports or in multi-institutional small series. The aim was to report cases seen at our institution and to perform a meta-analysis based on a literature review. METHODS AND RESULTS Six EAML cases seen at our institution were reviewed and a meta-analysis performed using cases retrieved from a literature review. There were a total of 69 cases for review. The male:female ratio was 1:3. In the absence of areas of typical AML, useful features in distinguishing EAML from epithelial renal neoplasms include: extreme degree of cytological atypia, histiocytoid appearance, presence of melanocytic pigments, solid architecture with the absence of frequent areas of alveolar pattern, tubulo-papillary formation and scarring. A fatal outcome, distant or lymph node metastasis, venous invasion and local recurrence were considered as adverse events and occurred in 40% of cases over a period of follow-up of 3-60 months (mean 22.5 +/- 18 months). Tumours with an unfavourable outcome showing marked cytological atypia and extensive tumour necrosis were larger (135 +/- 43 mm) than those with a favourable outcome (79 +/- 50 mm) (P < 0.002), and predominantly occurred in men. CONCLUSIONS Renal neoplasms with certain unusual features should be investigated immunohistochemically to rule out the possibility of EAML. The frequency of adverse outcome is lower in EAML than in renal cell carcinoma.
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Affiliation(s)
- Hamidreza Faraji
- Division of Anatomical Pathology, Department of Laboratory Medicine, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada
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Abstract
Von Hippel-Lindau syndrome (VHL) is a rare autosomal-dominant, inherited familial cancer syndrome. Hemangioblastomas, pheochromocytomas and renal carcinoma are the frequent reported VHL tumors. Neuroendocrine tumors have also been described, mostly in the pancreas and rarely in the biliary trees. We report the second case of bile duct carcinoid in a 31-year-old VHL woman. She underwent right adrenalectomy for a pheochromocytoma in the past. She also had a positive family history of phenotypic expression of VHL syndrome. The patient presented with biliary colic. Endoscopic retrograde cholangio-pancreatography showed intra-luminal bile duct mass. Surgical exploration identified a beige nodular lesion that was a carcinoid tumor on histology. This new association should be clarified by further genetic investigations.
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Boulanger Y, Amara M, Lepanto L, Beaudoin G, Nguyen BN, Allaire G, Poliquin M, Nicolet V. Diffusion-weighted MR imaging of the liver of hepatitis C patients. NMR Biomed 2003; 16:132-136. [PMID: 12884356 DOI: 10.1002/nbm.818] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Magnetic resonance diffusion-weighted imaging (DWI) of the liver was investigated to determine whether this method could be used to differentiate between the stages of fibrosis and inflammation for hepatitis C viral infection. DWI data were recorded for 18 hepatitis C patients and 10 control subjects using a modified pulse sequence allowing a 52 ms echo time delay. Acquisitions were performed with breath holding using five different b gradient factor values ranging between 50 and 250 s/mm(2) and in the three axes. Apparent diffusion coefficient (ADC) values were measured from a 5.7 cm(2) area in the central region of the liver. The inflammation and fibrosis grades were evaluated histologically on a biopsy sample. The mean ADC values were 2.30 +/- 1.28 x 10(-3) and 1.79 +/- 0.25 x 10(-3) mm(2)/s for hepatitis C patients and control subjects, respectively. Using our technique, no correlation could be found between the ADC values and the inflammation or fibrosis scores, indicating that tissue changes produced by hepatitis C do not appear to be quantifiable by DWI.
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Affiliation(s)
- Yvan Boulanger
- Département de radiologie, Centre hospitalier de l'Université de Montréal, Montreal, Quebec, Canada.
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Abstract
The contribution of radio-guided transcutaneous biopsy in the diagnosis of focal nodular hyperplasia (FNH) of the liver was compared with the findings on surgical specimens to assess its contribution in clinical and radiologic atypical cases. This retrospective study involved 30 patients with atypical tumors on imaging who underwent liver biopsy and then surgery. All surgical specimens were diagnosed as FNH, either classical (n = 18) or nonclassical (n = 12). Imaging data were reviewed according to 4 radiologic criteria on magnetic resonance imaging (MRI) and/or computed tomography (CT) scan (hypervascularity, homogeneity, nonencapsulation, and presence of a central scar), and classified depending on the number of criteria found (group I, 4 of 4; group II, 3 of 4; group III, 2 or fewer). Histologic assessment of ultrasound (US)-guided liver biopsy recorded major diagnostic features (fibrous bands, thick-walled vessels, reactive ductules, and nodularity) and minor features (sinusoidal dilatation and perisinusoidal fibrosis). "Definite FNH" (3 or 4 major features) was diagnosed in 14 biopsies, "possible FNH" (2 major and 1 or 2 minor features) in 7 cases, and "negative for FNH" (2 or fewer major features without minor features) in 9 cases. The diagnosis of FNH on biopsy was reached in 14 cases (58.3%) in patients with 2 or fewer imaging criteria (group III; n = 24). Biopsies with a diagnosis of "possible FNH" corresponded to a large proportion of telangiectatic-type FNH on the specimen. In conclusion, liver biopsy does not appear to be necessary in cases in which imaging is typical. However, the absence of radiologic diagnostic criteria in FNH does not preclude a positive diagnosis on liver needle biopsy. Using the proposed histologic scoring system, surgical management may be avoided in these cases.
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Affiliation(s)
- Aurélie Fabre
- Service d'Anatomie Pathologique, Hôpital Beaujon, Clichy, France
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Nguyen BN, Yablon SA, Chen CY. Hypodipsic hypernatremia and diabetes insipidus following anterior communicating artery aneurysm clipping: diagnostic and therapeutic challenges in the amnestic rehabilitation patient. Brain Inj 2001; 15:975-80. [PMID: 11689095 DOI: 10.1080/02699050110063459] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Hypodipsic hypernatremia (HH) represents a pathological increase in serum sodium due to a lack of thirst and defect in hypothalamic osmoreceptors. While 15% of patients with HH have a vascular aetiology, few cases have been described. Moreover, the presence of such abnormalities in the amnestic patient can have particularly threatening implications, as HH tends to recur unless the patient complies with a regimen of water intake. This study reports the case of a 46-year-old male admitted for rehabilitation of functional deficits following subarachnoid haemorrhage (SAH), with clipping of an anterior communicating artery (ACoA) aneurysm. Clinical examination was remarkable for profound short-term memory loss and inability to retain new information. Blood chemistry on admission showed a serum sodium level of 160 mEq/L, increasing to 167 mEq/L the following day. The patient denied thirst, and showed no clinical signs of dehydration. Neuroendocrine evaluation revealed diabetes insipidus (DI) and HH. Treatment initially included DDAVP and intravenous hydration, later supplemented with chlorpropramide. Stabilization of serum sodium and osmolality did not ensue until the treatment regimen included hydrochlorothiazide and supervision of enforced fluid intake. Endocrine abnormalities may be encountered among patients with vascular lesions adjacent to the hypothalamus. Rehabilitation interventions include establishing a structured medication regimen with fluid administration in the amnestic patient with hypothalamic dysfunction.
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Affiliation(s)
- B N Nguyen
- Mississippi Methodist Rehabilitation Center, Jackson, MS, USA.
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Cassada DC, Tribble CG, Laubach VE, Nguyen BN, Rieger JM, Linden J, Kaza AK, Long SM, Kron IL, Kern JA. An adenosine A2A agonist, ATL-146e, reduces paralysis and apoptosis during rabbit spinal cord reperfusion. J Vasc Surg 2001; 34:482-8. [PMID: 11533601 DOI: 10.1067/mva.2001.117996] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND We hypothesized that systemic ATL-146e, an adenosine A(2A) agonist, would decrease spinal cord reperfusion inflammatory stress and inhibit apoptosis and that these effects would correlate with improved neurologic functional outcome. METHODS Thirty rabbits underwent cross-clamping of the infrarenal aorta for 45 minutes. One group of animals (n = 14) received 0.06 microg/kg per minute of ATL-146e infused intravenously for 3 hours, beginning 15 minutes before reperfusion. A second group of animals (n = 16) underwent spinal cord ischemia with saline vehicle alone and served as ischemic controls. Animals (n = 9, 11) from each group survived for 48 hours and assessed for neurologic impairment with the Tarlov (0-5) scoring system. Four animals from each group were humanely killed at the end of the 3-hour treatment period, and the remainder killed after 48 hours' survival. In all animals, lumbar spinal cord tissue specimens were frozen for subsequent Western blot analysis of heat shock protein 70 (HSP 70), and for the p85 fragment of poly (ADP-ribose) polymerase (PARP). Neuronal viability indices were determined at 48 hours with hematoxylin and eosin staining. RESULTS There was improvement in neurologic function in rabbits receiving ATL-146e (P <.001) compared with ischemic controls. At the end of the 3-hour treatment period there was a 46% (P <.05) decrease in HSP 70 expression in the ATL-146e group compared with the control group, but no difference in PARP expression. At 48 hours, there was no difference between control and ATL-146e groups in HSP 70 expression, but there was a 65% (P <.05) reduction in PARP in the spinal cords of animals that had received ATL-146e. There was a significant improvement in neuronal viability indices in animals receiving ATL-146e compared with ischemic controls (P <.05). CONCLUSIONS Systemic ATL-146e infusion during reperfusion after spinal cord ischemia results in preservation of hindlimb motor function. There is evidence of decreased spinal cord inflammatory stress immediately after treatment with ATL-146e as indicated by reduced HSP 70 induction. Treatment with ATL-146e is associated with a reduction in neuronal apoptosis as suggested by a substantial decrease in the fragmentation of PARP at 48 hours. These results suggest that inflammation during reperfusion and subsequent apoptosis contribute to paralysis after restoration of blood flow to the ischemic spinal cord.
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Affiliation(s)
- D C Cassada
- Department of Surgery, Division of Thoracic and Cardiovascular Surgery, The University of Virginia Health System, Charlottesville 22908, USA
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Nguyen BN, Parker RB, Noujedehi M, Sullivan JM, Johnson JA. Effects of COER-verapamil on circadian pattern of forearm vascular resistance and blood pressure. J Clin Pharmacol 2000; 40:1480-7. [PMID: 11185670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Controlled-onset extended-release verapamil (COER-V) is designed so drug concentrations rise sharply in the early morning to coincide with the peak incidence of cardiovascular events. The primary objective of this study was to compare the diurnal pattern of forearm vascular resistance (FVR) between hypertensives and normotensives and to determine the effect of COER-V on FVR's diurnal pattern. The authors also studied the effects of COER-V on 24-hour ambulatory blood pressure (ABP) and the early morning blood pressure rise. Baseline 24-hour ABP was recorded, and FVR was determined by venous occlusion plethysmography at 7 a.m., 2 p.m., and 9 p.m. in 23 untreated hypertensives; FVR was also determined in 10 matched, normotensive controls. Plethysmography studies and 24-hour ABP were repeated and S- and R-verapamil concentrations determined over 24 hours by HPLC following > or = 4 weeks of therapy. The diurnal pattern of FVR differed between hypertensives and normotensives, with normotensives exhibiting an FVR decline between 2 p.m. and 9 p.m., while FVR rose at 9 p.m. in hypertensives. COER-V appeared to minimize the diurnal variation in FVR in hypertensives, although there were no significant differences at any single time point (baseline 7 a.m.: 58 +/- 24; 2 p.m.: 48 +/- 13; and 9 p.m.: 55 +/- 19 vs. COER-V at 7 a.m.: 51 +/- 23; 2 p.m.: 51 +/- 17; and 9 p.m.: 54 +/- 17 mmHg/ml/min/100 g). COER-V effectively reduced ABP throughout the 24-hour period (p < 0.05). No significant differences were found in the slopes of the early morning rise in BP or change in morning trough-to-peak BP at baseline and on the drug. The data suggest that hypertension alters the normal diurnal pattern in FVR and that COER-V minimizes the diurnal variation in this parameter. In addition, the authors conclude that COER-V is an effective antihypertensive that lowers BP throughout a 24-hour period, but it does not blunt the early morning rate of BP rise despite peak S-verapamil concentrations in the early morning.
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Affiliation(s)
- B N Nguyen
- University of Tennessee, Memphis, Colleges of Pharmacy and Medicine, USA
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Abstract
OBJECTIVE To report a case of tablet impaction of nifedipine extended-release tablets (Procardia XL) discovered one year after discontinuation of the drug in a patient with peptic stricture. DATA SOURCES English-language references identified via a MEDLINE search from 1966 through September 1998 and bibliographic review of pertinent articles. DATA SYNTHESIS Extended-release nifedipine has been associated with the formation of medication bezoars in case reports. Bezoars are concretions of undigested material within the gastrointestinal (GI) tract. Although they can occur throughout the GI tract, bezoars are most frequently located in the stomach and, rarely, in the duodenum. We report an unusual case of tablet impaction with a gastric outlet obstruction in the duodenal area discovered one year after the patient stopped taking extended-release nifedipine. CONCLUSIONS Extended-release nifedipine is associated with tablet impaction, even long after discontinuing administration. Although rare, clinicians should be aware of this potential problem when prescribing extended-release medications to patients at risk, and should consider this possible etiology when refractory epigastric pain and weight loss occur.
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Nguyen BN, Fléjou JF, Terris B, Belghiti J, Degott C. Focal nodular hyperplasia of the liver: a comprehensive pathologic study of 305 lesions and recognition of new histologic forms. Am J Surg Pathol 1999; 23:1441-54. [PMID: 10584697 DOI: 10.1097/00000478-199912000-00001] [Citation(s) in RCA: 257] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Atypical histologic variants of focal nodular hyperplasia have been reported and are sometimes difficult to recognize. To characterize the morphologic spectrum of focal nodular hyperplasia, we studied 305 lesions surgically resected from 168 patients. Clinicomorphologic correlations were established by statistical analyses. The patients included 150 women and 18 men (sex ratio, 8:1; median age, 38 years). One hundred twenty-eight (76.2%) patients had solitary lesions, and 40 (23.8%) had 2 to 30 lesions. All 305 lesions measured 1 mm to 19 cm in diameter. Only 49% of these lesions had one to three macroscopic scars. Histologically, 245 (80.3%) lesions were of classical form, and 60 (19.7%) lesions were nonclassical. The latter were classified as focal nodular hyperplasia of telangiectatic form (47 lesions), of mixed hyperplastic and adenomatous form (five lesions), and with atypia of large cell type (eight lesions). Several benign or malignant tumors were found in association with these lesions. This large retrospective series of focal nodular hyperplasia shows the relative incidence of its classical and nonclassical forms. The absence of a central scar could explain the difficult preoperative diagnosis of some of the cases. The morphologic diagnostic criteria in this study require further prospective evaluation.
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Affiliation(s)
- B N Nguyen
- Department of Anatomic Pathology, Beaujon Hospital, Clichy, France
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Salbilla BA, Vaghefi H, Chhabra P, Hall G, Brown D, Sadoughi F, Francisco E, Attas L, Walker SL, Nguyen BN, Oppenheimer SB. Analysis of cell surface properties using derivatized agarose beads. Acta Histochem 1999; 101:271-9. [PMID: 10443290 DOI: 10.1016/s0065-1281(99)80028-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
An assay has been developed to analyse cell surface properties using agarose beads derivatized with amino acids, sugars, proteins, and other molecules. The assay is simple and rapid and is useful to identify new cell surface markers. Various species and strains of yeast, paramecium, and Euglena were tested for their ability to bind to over 100 types of derivatized beads. A variety of specificity studies were performed in order to understand the nature of cell-bead binding. Our results indicate that cell-bead binding is often specific enough to distinguish between configurational isomers and spacer sizes and can be blocked by addition of specific molecules to the incubation medium. In some cases, different species or strains differed only by their binding to a single bead type. This simple and rapid assay may help to uncover new cell surface receptors and may lead to the development of clinically useful compounds for therapeutic applications.
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Affiliation(s)
- B A Salbilla
- Department of Biology, California State University, Northridge 91330-8303, USA
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Le NB, Pham TY, Nguyen BN, Dang CT, Pham TL, Le DC. Efficacy and effectiveness of five day treatment of uncomplicated falciparum with artemisinin or artesunate in Vietnam. Southeast Asian J Trop Med Public Health 1999; 30:3-6. [PMID: 10695777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
A study on efficacy and effectiveness of artemisinin (total dose of 60 mg/kg) and artesunate (total dose of 12 mg/kg over five days) in treatment of uncomplicated malaria was conducted in highly malaria transmitted areas in Vietnam. 126 uncomplicated malaria cases finished 14 day follow-up. 100% cure rate achieved at day 14 in patients of the efficacy groups received either artemisinin or artesunate, while it was 83% and 93% in patients treated respectively with artemisinin and artesunate of the effectiveness groups. Compliance of the treatment regimens was discussed.
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Affiliation(s)
- N B Le
- Institute of Malariology, Parasitology and Entomology, Ha Noi, Vietnam
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Szczepankiewicz BG, Bal RB, von Geldern TW, Wu-Wong JR, Chiou WJ, Dixon DB, Opgenorth TJ, Hoffman DJ, Borre AJ, Marsh KC, Nguyen BN. The effects of diminishing albumin binding to some Endothelin receptor antagonists. Life Sci 1998; 63:1905-12. [PMID: 9825768 DOI: 10.1016/s0024-3205(98)00466-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
As a pharmacological class, Endothelin-A receptor (ET(A)) antagonists are highly bound (>98%) to serum albumin. In the presence of physiological concentrations of albumin, their affinities for ET(A) decrease 10 to 100 fold. We have prepared ET(A) antagonists which exhibit lower degrees of binding to albumin, while maintaining potency and selectivity for the ET(A) receptor. The protein induced IC50 shift is reduced or eliminated in this new series of compounds. The compounds also display altered in vivo and pharmacokinetic profiles which may be consistent with their lower degree of protein binding.
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Affiliation(s)
- B G Szczepankiewicz
- Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, IL 60064, USA.
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Nguyen BN, Johnson JA. The role of endothelin in heart failure and hypertension. Pharmacotherapy 1998; 18:706-19. [PMID: 9692645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The endothelin family consists of three structurally similar isopeptides: ET-1, ET-2, and ET-3. The two receptor subtypes, ETA and ETB, have different receptor affinities for the isopeptides. Stimulation of ETA and ETB receptors results in vasoconstriction, and ETB stimulation also causes vasodilation. These receptors may have profound impact on the etiologies of various diseases, including heart failure and hypertension. Studies with endothelin-receptor antagonists in animals and humans with heart failure show promising short- and long-term results. The place of the agents in the treatment of essential hypertension remains controversial, but they may have a greater role in hypertensive blacks and transplant recipients.
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Affiliation(s)
- B N Nguyen
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee, Memphis, USA
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Zoładek T, Nguyen BN, Jagiełło I, Graczyk A, Rytka J. Diamino acid derivatives of porphyrins penetrate into yeast cells, induce photodamage, but have no mutagenic effect. Photochem Photobiol 1997; 66:253-9. [PMID: 9277145 DOI: 10.1111/j.1751-1097.1997.tb08651.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The yeast Saccharomyces cerevisiae was used as a model eukaryotic organism to study the uptake of diamino acid derivatives of porphyrins and their phototoxicity with particular emphasis on possible mutagenic effects. The water-soluble hematoporphyrin derivatives diarginate (HpD[Arg]2) and 1-arginin di(N-amino acid)-protoporphyrinate used in this study are effective photosensitizers in tumor photodynamic therapy. Depending on the amino acid substituent, the porphyrin derivatives differ in their affinity for yeast cells. It is shown that HpD(Arg)2 and PP(Met)2 (Arg)2 penetrate into the yeast cell and are metabolized. Both compounds sensitize yeast cells to photodamage but have no mutagenic effect on nuclear or mitochondrial genomes.
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Affiliation(s)
- T Zoładek
- Department of Genetics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
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Zoładek T, Nguyen BN, Rytka J. Saccharomyces cerevisiae mutants defective in heme biosynthesis as a tool for studying the mechanism of phototoxicity of porphyrins. Photochem Photobiol 1996; 64:957-62. [PMID: 8972638 DOI: 10.1111/j.1751-1097.1996.tb01861.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Mutants of Saccharomyces cerevisiae accumulating uroporphyrin (UP) or protoporphyrin (PP) were used as a model for the in vivo phototoxic effect of porphyrins observed in the human skin photosensitivity associated with porphyrias (porphyria cutanea tarda and erythropoietic protoporphyria). We have found that UP is localized in vacuoles and PP is present in all compartments except vacuoles in yeast cells. Endogenous PP is much more effective as a photosensitizer of yeast cells than UP. Protoporphyrin action is strictly dependent on the presence of oxygen. In contrast, UP displays a phototoxic effect even if oxygen is not present in the suspension, implicating a free radical mechanism that operates in anaerobiosis upon photosensitization by UP. Catalase or superoxide dismutase deficiency affects photosensitization by UP. A possible mechanism of UP photosensitizing activity is discussed.
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Affiliation(s)
- T Zoładek
- Department of Genetics, Polish Academy of Sciences, Warszawa, Poland.
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Abstract
In a controlled study, inpatient violence was measured during placebo, high-potency (haloperidol) and low-potency (chlorpromazine or clozapine) neuroleptics. Some patients had a marked increase in violent behavior with the moderately high-dose haloperidol, but not with low-potency neuroleptics. The authors discuss reasons for the increased violence with haloperidol, including akathisia and drug-induced behavioral toxicity.
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Affiliation(s)
- J N Herrera
- Clinical Research Unit, Metropolitan State Hospital, Norwalk, California 90250
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