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Wade J, Petitpas KM, Dar W, Ali A, Radojevic JA, Lawlor MT, Hammond JA, Gluck J, Feingold AD, Jaiswal A, Ebcioglu Z, Einstein M, Morgan G, Emmanuel B, Ye X, Singh JU, Sotil EU, Swales C, Kent R, Richardson E, Cheema F, Serrano OK. Non-Lung Solid Organ Transplantation From SARS-CoV-2-Positive Donors to Uninfected Recipients. Transplant Proc 2023; 55:1793-1798. [PMID: 37487863 DOI: 10.1016/j.transproceed.2023.06.008] [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] [Received: 05/26/2023] [Accepted: 06/23/2023] [Indexed: 07/26/2023]
Abstract
BACKGROUND There is a paucity of evidence on the risk of donor-recipient transmission of the SARS-CoV-2 in solid organ transplant recipients. Initial impressions suggest non-lung solid organs may be safely transplanted from SARS-CoV-2-positive donors without risk of viral transmission. METHODS We reviewed clinical results of transplants in which SARS-CoV-2-negative recipients received non-lung solid organs from SARS-CoV-2-positive donors at a single transplant center. No prisoners were used in this study, and participants were neither coerced nor paid. The manuscript was created in compliance with the Helsinki Congress and the Declaration of Istanbul. RESULTS Between June 2021 and January 2023, we transplanted 26 solid organs, including 13 kidneys, 8 livers, 3 hearts, and 1 simultaneous heart and kidney, from 23 SARS-CoV-2-positive donors into 25 SARS-CoV-2 negative recipients. Two of the recipients had a positive SARS-CoV-2 real-time polymerase chain reaction after transplantation, but otherwise, patients had no SARS-CoV-2-related complications, and all patients to date are alive with excellent allograft function. CONCLUSION Transplantation of non-lung solid organs from SARS-CoV-2-positive donors into uninfected recipients can be safely performed without adverse effects from SARS-CoV-2.
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Affiliation(s)
- Jason Wade
- Department of Surgery, Hartford Hospital, Hartford, Connecticut
| | | | - Wasim Dar
- Department of Surgery, Hartford Hospital, Hartford, Connecticut; Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Ayyaz Ali
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut
| | - Joseph A Radojevic
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Michael T Lawlor
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Jonathan A Hammond
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut
| | - Jason Gluck
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Andrew D Feingold
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Abhishek Jaiswal
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Center for Advanced Heart Failure and Pulmonary Vascular Disease, Hartford Hospital, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Zeynep Ebcioglu
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Michael Einstein
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Glyn Morgan
- Department of Surgery, Hartford Hospital, Hartford, Connecticut; Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Bishoy Emmanuel
- Department of Surgery, Hartford Hospital, Hartford, Connecticut; Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Xiaoyi Ye
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Joseph U Singh
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Eva U Sotil
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Colin Swales
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Rebecca Kent
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Elizabeth Richardson
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Faiqa Cheema
- Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut
| | - Oscar K Serrano
- Department of Surgery, Hartford Hospital, Hartford, Connecticut; Transplant & Comprehensive Liver Center, Hartford, Connecticut; Department of Surgery, University of Connecticut School of Medicine, Farmington, Connecticut.
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Abstract
Since their discovery, riboswitches have been attractive tools for the user-controlled regulation of gene expression in bacterial systems. Riboswitches facilitate small molecule mediated fine-tuning of protein expression, making these tools of great use to the synthetic biology community. However, the use of riboswitches is often restricted due to context dependent performance and limited dynamic range. Here, we report the drastic improvement of a previously developed orthogonal riboswitch achieved through in vivo functional selection and optimization of flanking coding and noncoding sequences. The behavior of the derived riboswitches was mapped under a wide array of growth and induction conditions, using a structured Design of Experiments approach. This approach successfully improved the maximal protein expression levels 8.2-fold relative to the original riboswitches, and the dynamic range was improved to afford riboswitch dependent control of 80-fold. The optimized orthogonal riboswitch was then integrated downstream of four endogenous stress promoters, responsive to phosphate starvation, hyperosmotic stress, redox stress, and carbon starvation. These responsive stress promoter-riboswitch devices were demonstrated to allow for tuning of protein expression up to ∼650-fold in response to both environmental and cellular stress responses and riboswitch dependent attenuation. We envisage that these riboswitch stress responsive devices will be useful tools for the construction of advanced genetic circuits, bioprocessing, and protein expression.
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Affiliation(s)
- R. Kent
- Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - N. Dixon
- Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
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Affiliation(s)
- Natalie Kaine
- Sydney North and East Team, Vision Australia, 4 Mitchell Street, Enfield NSW 2136, Australia
| | - Rebecca Kent
- Children's Services, Sydney North and East team, Vision Australia
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Chauhan K, Azzi Y, Faddoul G, Liriano‐Ward L, Chang P, Nadkarni G, Delaney V, Ames S, Debnath N, Singh N, Sehgal V, Di Boccardo G, Garzon F, Nair V, Kent R, Lerner S, Coca S, Shapiro R, Florman S, Schiano T, Menon MC. Pre‐liver transplant renal dysfunction and association with post‐transplant end‐stage renal disease: A single‐center examination of updated UNOS recommendations. Clin Transplant 2018; 32:e13428. [DOI: 10.1111/ctr.13428] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 08/30/2018] [Accepted: 10/04/2018] [Indexed: 11/30/2022]
Affiliation(s)
- Kinsuk Chauhan
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Yorg Azzi
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Geovani Faddoul
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Luz Liriano‐Ward
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Paul Chang
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Girish Nadkarni
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Veronica Delaney
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Scott Ames
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Neha Debnath
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Nandita Singh
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Vinita Sehgal
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Graciela Di Boccardo
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Felipe Garzon
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Vinay Nair
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Rebecca Kent
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Susan Lerner
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Steven Coca
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Ron Shapiro
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Sander Florman
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Thomas Schiano
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
| | - Madhav C. Menon
- Recanati Miller Transplant Institute Icahn School of Medicine at Mount Sinai New York City New York
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Kent R, Jeong H. Effects of Fenofibrate on the Expression of Small Heterodimer Partner (SHP) and Cytochrome P450 (CYP) 2D6. Drug Metab Lett 2017; 11:68-72. [PMID: 28403802 DOI: 10.2174/1872312811666170407164631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 03/21/2017] [Accepted: 03/22/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Cytochrome P450 (CYP) 2D6 is a major drug-metabolizing enzyme, responsible for eliminating 25% of marketed drugs. We recently identified SHP as a negative regulator of CYP2D6 expression and showed that factors that alter SHP expression influence CYP2D6 expression. Fenofibrate, an agonist of peroxisome proliferator-activated receptor α(PPARα), has been previously reported to upregulate SHP expression in the mouse liver. The objective of this study was to determine whether fenofibrate decreases CYP2D6 expression via upregulating SHP expression. METHODS CYP2D6-humanized transgenic mice were administered with fenofibrate (100 mg/kg/day intraperitoneally for 5 days) or vehicle control. Hepatic mRNA and protein expression levels of CYP2D6 and SHP were measured. RESULTS Results showed that while mRNA levels of SHP did not differ between the groups, protein levels of SHP increased by 2-fold in fenofibrate-treated mice. Despite the increased SHP protein levels, CYP2D6 expression did not decrease at the mRNA or protein levels. Similar results were observed in human hepatocytes treated with fenofibrate. Results from transient transfection and promoter reporter assays indicate that PPARα can transactivate CYP2D6 promoter, suggesting that the lack of CYP2D6 downregulation by fenofibrate may be in part due to the activation of CYP2D6 promoter by PPARα. CONCLUSION These results indicate that fenofibrate has minimal effects on CYP2D6 expression despite increased SHP expression.
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Affiliation(s)
- Rebecca Kent
- Department of Pharmacy Practice (H.J.); Department of Biopharmaceutical Sciences (R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA
| | - Hyunyoung Jeong
- Department of Pharmacy Practice (H.J.); Department of Biopharmaceutical Sciences (R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA
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Yacoub R, Nadkarni GN, Cravedi P, He JC, Delaney VB, Kent R, Chauhan KN, Coca SG, Florman SS, Heeger PS, Murphy B, Menon MC. Analysis of OPTN/UNOS registry suggests the number of HLA matches and not mismatches is a stronger independent predictor of kidney transplant survival. Kidney Int 2017; 93:482-490. [PMID: 28965746 DOI: 10.1016/j.kint.2017.07.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 03/17/2017] [Revised: 06/20/2017] [Accepted: 07/20/2017] [Indexed: 12/14/2022]
Abstract
HLA matching and mismatching, while inversely related, are not exact opposites. Here we determined the independent effects of HLA matching and mismatching on outcomes in deceased donor kidney transplant recipients. The United Network for Organ Sharing database (1995-2012) was utilized and analyzed for delayed graft function, one-year acute rejection, and death-censored graft survival using combined multivariable models including HLA matching and mismatching. Sensitivity analyses were performed using the subgroup of deceased donor kidney transplant patients after 2003 with more uniform HLA nomenclature and resampling analyses using bootstrapping on complete data available from 96,236 recipients. Individually, both HLA matching and mismatching showed significant associations with graft survival. Adjusting the model to take into account both matching and mismatching simultaneously, the degree of HLA mismatching lost significance while matching continued to have a significant prediction for delayed graft function, the one-year acute rejection rate, and graft survival. Sensitivity analyses and bootstrapping showed similar results for all studied outcomes. Thus, analysis of this large cohort demonstrates the apparent greater association of HLA matching over HLA mismatching on both early allograft events as well as graft survival. Future analyses should preferentially utilize HLA matching as a covariate over mismatching for accurately reflecting impact on graft outcomes.
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Affiliation(s)
- Rabi Yacoub
- Division of Nephrology, Department of Medicine, University at Buffalo, Buffalo, New York, USA
| | - Girish N Nadkarni
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Paolo Cravedi
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - John Cijiang He
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Veronica B Delaney
- Recanati-Miller Transplant Institutes, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Rebecca Kent
- Recanati-Miller Transplant Institutes, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Kinsuk N Chauhan
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Steven G Coca
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Sander S Florman
- Recanati-Miller Transplant Institutes, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Peter S Heeger
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Recanati-Miller Transplant Institutes, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Barbara Murphy
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Madhav C Menon
- Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Recanati-Miller Transplant Institutes, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
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7
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Nair V, Liriano-Ward L, Kent R, Huprikar S, Rana M, Florman SS, Delaney VB, Menon MC, Sehgal V, Miko L, Khaim R, Benvenisty A, Lerner S, Arvelakis A, Wadhera V, Ames S, Shapiro R. Early conversion to belatacept after renal transplantation. Clin Transplant 2017; 31. [PMID: 28267882 DOI: 10.1111/ctr.12951] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2017] [Indexed: 01/20/2023]
Abstract
Belatacept is a non-nephrotoxic immunosuppressive agent, which may make it the ideal agent for patients with delayed or slow graft function on calcineurin inhibitors. There are limited data on conversion of patients to belatacept within 6 months of transplantation. Between January 2012 and December 2015, 16 patients were converted to belatacept for delayed or poor graft function (eGFR<30 mL/min/1.73 m2 , MDRD); three were HIV positive. Conversion protocols were analyzed in patients ≤4 months and 4-6 months post-transplantation. Mean serum creatinine levels after belatacept conversion were compared with preconversion levels. Patient survival was 100%, and graft survival was 88%. The mean creatinine fell from 3.9±1.82 mg/dL prebelatacept conversion to 2.1±1.1 mg/dL at 6 months and 1.9±0.47 mg/dL (median 1.8 mg/dL) at 12 months postconversion. There was no significant increased risk of rejection, infection, or malignancy. HIV parameters remained largely stable. Early conversion to belatacept in patients with DGF or slow graft function is safe and efficacious, in a single-center nonrandomized retrospective analysis.
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Affiliation(s)
- Vinay Nair
- Department of Medicine, Hofstra Northwell School of Medicine, Great Neck, NY, USA
| | - Luz Liriano-Ward
- Department of Medicine, Robert Wood Johnson University Hospital, New Brunswick, NJ, USA
| | - Rebecca Kent
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Shirish Huprikar
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mena Rana
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sander S Florman
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Veronica B Delaney
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Madhav C Menon
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Vinita Sehgal
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Leandra Miko
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Rafael Khaim
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Alan Benvenisty
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Susan Lerner
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Antonios Arvelakis
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Vikram Wadhera
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Scott Ames
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
| | - Ron Shapiro
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY, USA
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Bayramian A, Armstrong P, Ault E, Beach R, Bibeau C, Caird J, Campbell R, Chai B, Dawson J, Ebbers C, Erlandson A, Fei Y, Freitas B, Kent R, Liao Z, Ladran T, Menapace J, Molander B, Payne S, Peterson N, Randles M, Schaffers K, Sutton S, Tassano J, Telford S, Utterback E. The Mercury Project: A High Average Power, Gas-Cooled Laser for Inertial Fusion Energy Development. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1517] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. Bayramian
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - P. Armstrong
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - E. Ault
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - R. Beach
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - C. Bibeau
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - J. Caird
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - R. Campbell
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - B. Chai
- Crystal Photonics, Inc 5525 Sanford Lane, Sanford, Fl 32773
| | - J. Dawson
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - C. Ebbers
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - A. Erlandson
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - Y. Fei
- Crystal Photonics, Inc 5525 Sanford Lane, Sanford, Fl 32773
| | - B. Freitas
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - R. Kent
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - Z. Liao
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - T. Ladran
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - J. Menapace
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - B. Molander
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - S. Payne
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - N. Peterson
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - M. Randles
- Northrop Grumman Space Technologies, Synoptics, 1201 Continental Blvd., Charlotte, NC 28273
| | - K. Schaffers
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - S. Sutton
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - J. Tassano
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - S. Telford
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
| | - E. Utterback
- Lawrence Livermore National Laboratory, 7000 East Ave., L-470, Livermore, CA 94551
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Kent R, Gopalakrishnan VP, Menon MC, Ross MJ. The Case | Labile creatinine levels in a patient with breast cancer. Kidney Int 2017; 91:761-762. [DOI: 10.1016/j.kint.2016.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Revised: 08/02/2016] [Accepted: 08/11/2016] [Indexed: 11/15/2022]
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10
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Pan X, Kent R, Won KJ, Jeong H. Cholic Acid Feeding Leads to Increased CYP2D6 Expression in CYP2D6-Humanized Mice. Drug Metab Dispos 2017; 45:346-352. [PMID: 28153841 DOI: 10.1124/dmd.116.074013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 01/25/2017] [Indexed: 12/17/2022] Open
Abstract
Cytochrome P450 2D6 (CYP2D6) is a major drug-metabolizing enzyme, but the factors governing transcriptional regulation of its expression remain poorly understood. Based on previous reports of small heterodimer partner (SHP) playing an important role as a transcriptional repressor of CYP2D6 expression, here we investigated how a known upstream regulator of SHP expression, namely cholestasis triggered by cholic acid (CA) feeding in mice, can lead to altered CYP2D6 expression. To this end, CYP2D6-humanized (Tg-CYP2D6) mice were fed with a CA-supplemented or control diet for 14 days, and hepatic expression of multiple genes was examined. Unexpectedly, CA feeding led to insignificant changes in SHP mRNA but also to significant (2.8-fold) decreases in SHP protein levels. In silico analysis of the SHP gene regulatory region revealed a putative binding site for a microRNA, miR-142-3p. Results from luciferase reporter assays suggest that miR-142-3p targets the SHP gene. Hepatic expression of miR-142-3p was significantly increased in CA-fed mice (∼5-fold), suggesting a potential role of miR-142-3p in the regulation of SHP expression in cholestasis. The decreased SHP protein levels were accompanied by increased expression and activity of CYP2D6 in the liver of CA-fed mice. These results suggest potential roles of differential hepatic levels of bile acids in the transcriptional regulation of CYP2D6 expression.
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Affiliation(s)
- Xian Pan
- Department of Pharmacy Practice (K.-J.W., H.J.) and Department of Biopharmaceutical Sciences (X.P., R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
| | - Rebecca Kent
- Department of Pharmacy Practice (K.-J.W., H.J.) and Department of Biopharmaceutical Sciences (X.P., R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
| | - Kyoung-Jae Won
- Department of Pharmacy Practice (K.-J.W., H.J.) and Department of Biopharmaceutical Sciences (X.P., R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
| | - Hyunyoung Jeong
- Department of Pharmacy Practice (K.-J.W., H.J.) and Department of Biopharmaceutical Sciences (X.P., R.K., H.J.), College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois
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11
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Nair V, Khaim R, El-Salem F, Kent R, Lerner S, Berger A, Miko L, Rollins B, Ebcioglu Z, Delaney V, Sehgal V, Menon M, Ames S, Benvenisty A, Wadhera V, Arvelakas A, Schiano T, Rana M, Huprikar S, Florman S, Shapiro R. Hepatitis C and Human Immunodeficiency Virus Kidney Transplantation: The Mount Sinai Experience. Clin Transpl 2015; 31:69-78. [PMID: 28514569] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mount Sinai Hospital in New York has a long history in the field of organ transplantation. The first kidney transplant at Mount Sinai was performed in 1967 by the late Dr. Lewis Burrows and the first laparoscopic donor nephrectomy in New York was performed at Mount Sinai in 1996. Over 3000 kidney transplantations have been performed at Mount Sinai. In the early 1990s, the first hepatitis C virus (HCV) positive patient at Mount Sinai underwent a kidney transplant and the first kidney transplant in a patient with human immunodeficiency virus (HIV) in New York was performed at Mount Sinai in 2001. In general, these patients have done well after renal transplantation, with outcomes similar to those seen in non-infected patients. This chapter will describe the evolution of immunosuppressive regimens in HCV positive and HIV positive patients, and will describe the outcomes of kidney transplantation in these patients. Given the favorable outcomes, it is reasonable to continue to offer renal transplantation as a treatment for end stage renal disease patients with HCV and/or HIV.
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Affiliation(s)
- Vinay Nair
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Rafael Khaim
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Fadi El-Salem
- Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Rebecca Kent
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Susan Lerner
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Amnon Berger
- Clinical Virology Unit and Department of Biochemistry and the Chanock Center for Virology, IMRIC, Hadassah Hebrew University Medical Center and Faculty of Medicine, Jerusalem, Israel
| | - Leandra Miko
- Pharmacy Department, The Mount Sinai Medical Center, New York, NY
| | - Brett Rollins
- Pharmacy Department, The Mount Sinai Medical Center, New York, NY
| | - Zeynep Ebcioglu
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Veronica Delaney
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Vinita Sehgal
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Madhav Menon
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Scott Ames
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Alan Benvenisty
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Vikram Wadhera
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Antonious Arvelakas
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Thomas Schiano
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Meena Rana
- Department of Medicine, Infectious Disease Division, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Shirish Huprikar
- Department of Medicine, Infectious Disease Division, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Sander Florman
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
| | - Ron Shapiro
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY
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Lopez-Valdes FJ, Riley PO, Lessley DJ, Arbogast KB, Seacrist T, Balasubramanian S, Maltese M, Kent R. The six degrees of freedom motion of the human head, spine, and pelvis in a frontal impact. Traffic Inj Prev 2014; 15:294-301. [PMID: 24372502 DOI: 10.1080/15389588.2013.817668] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE The goal of this study is to characterize the in situ 6-degree-of-freedom kinematics of the head, 3 vertebrae (T1, T8, and L2), and the pelvis in a 40 km/h frontal impact. METHODS Three postmortem human surrogates (PMHS) were exposed to a deceleration of 15 g over 125 ms and the motion of selected anatomical structures (head, T1, T8, L2, and pelvis) was tracked at 1000 Hz using an optoelectric stereophotogrammetric system. Displacements of the analyzed structures are reported in the sagittal and the transverse planes. Rotations of the structures are described using the finite helical axis of the motion. RESULTS Anterior displacements were 530.5 ± 39.4 mm (head), 434.7 ± 20.0 mm (T1), 353.3 ± 29.6 mm (T8), 219.9 ± 19.3 mm (L2), and 78.9 ± 22.1 mm (pelvis). The ratio between peak anterior and lateral displacement was up to 19 percent (T1) and 26 percent (head). Magnitudes of the rotation of the head (69.9 ± 1.5°), lumbar (66.5 ± 9.1°), and pelvis (63.8 ± 11.8°) were greater than that of the thoracic vertebrae (T1: 49.1 ± 7.8°; T8: 47.7 ± 6.3°). Thoracic vertebrae exhibited a complex rotation behavior caused by the asymmetric loading of the shoulder belt. Rotation of the lumbar vertebra and pelvis occurred primarily within the sagittal plane (flexion). CONCLUSION Despite the predominance of the sagittal motion of the occupant in a pure (12 o'clock) frontal impact, the asymmetry of belt loading induced other relevant displacements and rotations of the head and thoracic spine. Attempts to model occupant kinematics in a frontal impact should consider these results to biofidelically describe the interaction of the torso with the belt.
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Affiliation(s)
- F J Lopez-Valdes
- a Center for Applied Biomechanics , University of Virginia , Charlottesville , Virginia
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Edge TA, El-Shaarawi A, Gannon V, Jokinen C, Kent R, Khan IUH, Koning W, Lapen D, Miller J, Neumann N, Phillips R, Robertson W, Schreier H, Scott A, Shtepani I, Topp E, Wilkes G, van Bochove E. Investigation of an Escherichia coli environmental benchmark for waterborne pathogens in agricultural watersheds in Canada. J Environ Qual 2012; 41:21-30. [PMID: 22218170 DOI: 10.2134/jeq2010.0253] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Canada's National Agri-Environmental Standards Initiative sought to develop an environmental benchmark for low-level waterborne pathogen occurrence in agricultural watersheds. A field study collected 902 water samples from 27 sites in four intensive agricultural watersheds across Canada from 2005 to 2007. Four of the sites were selected as reference sites away from livestock and human fecal pollution sources in each watershed. Water samples were analyzed for Campylobacter spp., Salmonella spp., Escherichia coli O157:H7, Cryptosporidium spp., Giardia spp., and the water quality indicator E. coli. The annual mean number of pathogen species was higher at agricultural sites (1.54 ± 0.07 species per water sample) than at reference sites (0.75 ± 0.14 species per water sample). The annual mean concentration of E. coli was also higher at agricultural sites (491 ± 96 colony-forming units [cfu] 100 mL(-1)) than at reference sites (53 ± 18 cfu 100 mL(-1)). The feasibility of adopting existing E. coli water quality guideline values as an environmental benchmark was assessed, but waterborne pathogens were detected at agricultural sites in 80% of water samples with low E. coli concentrations (<100 cfu 100 mL(-1)). Instead, an approach was developed based on using the natural background occurrence of pathogens at reference sites in agricultural watersheds to derive provisional environmental benchmarks for pathogens at agricultural sites. The environmental benchmarks that were derived were found to represent E. coli values lower than geometric mean values typically found in recreational water quality guidelines. Additional research is needed to investigate environmental benchmarks for waterborne pathogens within the context of the "One World, One Health" perspective for protecting human, domestic animal, and wildlife health.
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Affiliation(s)
- T A Edge
- Water Science & Technology, National Water Research Institute, Environment Canada, Burlington, ON L7R 4A6, Canada.
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Arregui-Dalmases C, Del Pozo E, Stacey S, Kindig M, Lessley D, Lopez-Valdes F, Forman J, Kent R. Pressure waves in the aorta during isolated abdominal belt loading: the magnitude, phasing, and attenuation. Proc Inst Mech Eng H 2011; 225:688-95. [PMID: 21870376 DOI: 10.1177/0954411911400690] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
While rupture of the aorta is a leading cause of sudden death following motor vehicle crashes, the specific mechanism that causes this injury is not currently well understood. Aortic ruptures occurring in the field are likely due to a complex combination of contributing factors such as acceleration, compression of the chest, and increased pressure within the aorta. The objective of the current study was to investigate one of these factors in more detail than has been done previously; specifically, to investigate the in situ intra-aortic pressure generated during isolated belt loading to the abdomen. Ten juvenile swine were subjected to dynamic belt loads applied to the abdomen. Intraaortic pressure was measured at multiple locations to assess the magnitude and propagation of the resulting blood pressure wave. The greatest average peak pressure (113.6 +/- 43.5 kPa) was measured in the abdominal aorta. Pressures measured in the thoracic aorta and aortic arch were 70 per cent and 50 per cent, respectively, that measured in the abdominal aorta. No macroscopic aortic trauma was observed. To the authors' knowledge the present study is the first one to document the presence, propagation, and attenuation of a transient pressure wave in the aorta generated by abdominal belt loading. The superiorly moving wave is sufficient to generate hydrostatic and intimal shear stress in the aorta, possibly contributing to the hypothesized mechanisms of traumatic aortic rupture.
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Affiliation(s)
- C Arregui-Dalmases
- European Center for Injury Prevention, Preventive and Public Health Department, University of Navarra, Pamplona, Spain.
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Duprey S, Subit D, Lessley D, Guillemot H, Kent R. In vitrokinematics of the shoulder: comparison with in vivodata during arm flexion. Comput Methods Biomech Biomed Engin 2011. [DOI: 10.1080/10255842.2011.595175] [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: 10/17/2022]
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Hope R, Mushtaq S, James D, Pllana T, Warner M, Livermore DM, Brown D, Rooney P, Palmer R, Croal J, Weinbren M, Hogue S, Gould K, Cumberland N, Logan M, Pillay DG, Thomas C, Want S, Oppenheim B, Kent R, Manjula, Rizkalla, Wade J, Wilcox M, Swann A, Leonard A, Galloway, Al-Wali W, Hudson SJ, Rogers J, Winstanley T, Riley UBG, Johnstone DJ, El-Bouri K, Jones G, MacGowan A, Jepson A, Unsworth, James E, Shetty N, Shemko M, Hastings M, Lafong C, Richards S, Nash J, Waghorn D, Cullen M, Todd N, Anderson AN, D'Arcy S, Goodburn C, Bignardi G. Tigecycline activity: low resistance rates but problematic disc breakpoints revealed by a multicentre sentinel survey in the UK. J Antimicrob Chemother 2010; 65:2602-9. [DOI: 10.1093/jac/dkq370] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kanasi E, Dewhirst FE, Chalmers NI, Kent R, Moore A, Hughes CV, Pradhan N, Loo CY, Tanner ACR. Clonal analysis of the microbiota of severe early childhood caries. Caries Res 2010; 44:485-97. [PMID: 20861633 DOI: 10.1159/000320158] [Citation(s) in RCA: 156] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Accepted: 07/27/2010] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND/AIMS Severe early childhood caries is a microbial infection that severely compromises the dentition of young children. The aim of this study was to characterize the microbiota of severe early childhood caries. METHODS Dental plaque samples from 2- to 6-year-old children were analyzed using 16S rRNA gene cloning and sequencing, and by specific PCR amplification for Streptococcus mutans and Bifidobacteriaceae species. RESULTS Children with severe caries (n = 39) had more dental plaque and gingival inflammation than caries-free children (n = 41). Analysis of phylotypes from operational taxonomic unit analysis of 16S rRNA clonal metalibraries from severe caries and caries-free children indicated that while libraries differed significantly (p < 0.0001), there was increased diversity than detected in this clonal analysis. Using the Human Oral Microbiome Database, 139 different taxa were identified. Within the limits of this study, caries-associated taxa included Granulicatella elegans (p < 0.01) and Veillonella sp. HOT-780 (p < 0.01). The species associated with caries-free children included Capnocytophaga gingivalis (p < 0.01), Abiotrophia defectiva (p < 0.01), Lachnospiraceae sp. HOT-100 (p < 0.05), Streptococcus sanguinis (p < 0.05) and Streptococcus cristatus (p < 0.05). By specific PCR, S. mutans (p < 0.005) and Bifidobacteriaceae spp. (p < 0.0001) were significantly associated with severe caries. CONCLUSION Clonal analysis of 80 children identified a diverse microbiota that differed between severe caries and caries-free children, but the association of S. mutans with caries was from specific PCR analysis, not from clonal analysis, of samples.
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Affiliation(s)
- E Kanasi
- Department of Molecular Genetics, The Forsyth Institute, Boston, MA 02115, USA
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Palmer CA, Kent R, Loo CY, Hughes CV, Stutius E, Pradhan N, Dahlan M, Kanasi E, Arevalo Vasquez SS, Tanner ACR. Diet and caries-associated bacteria in severe early childhood caries. J Dent Res 2010; 89:1224-9. [PMID: 20858780 DOI: 10.1177/0022034510376543] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Frequent consumption of cariogenic foods and bacterial infection are risk factors for early childhood caries (ECC). This study hypothesized that a short diet survey focused on frequency of foods, categorized by putative cariogenicity, would differentiate severe ECC (S-ECC) from caries-free children. Children's diets were obtained by survey and plaque bacteria detected by PCR from 72 S-ECC and 38 caries-free children. S-ECC children had higher scores for between-meal juice (p < 0.01), solid-retentive foods (p < 0.001), eating frequency (p < 0.005), and estimated food cariogenicity (p < 0.0001) than caries-free children. S-ECC children with lesion recurrence ate fewer putative caries-protective foods than children without new lesions. Streptococcus mutans (p < 0.005), Streptococcus sobrinus (p < 0.005), and Bifidobacteria (p < 0.0001) were associated with S-ECC, and S. mutans with S. sobrinus was associated with lesion recurrence (p < 0.05). S. mutans-positive children had higher food cariogenicity scores. Food frequency, putative cariogenicity, and S. mutans were associated with S-ECC individually and in combination.
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Affiliation(s)
- C A Palmer
- Department of Public Health and Community Service, Tufts University School of Dental Medicine, Boston, MA 02111, USA
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Kanasi E, Johansson I, Lu SC, Kressin NR, Nunn ME, Kent R, Tanner ACR. Microbial risk markers for childhood caries in pediatricians' offices. J Dent Res 2010; 89:378-83. [PMID: 20164496 DOI: 10.1177/0022034509360010] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Dental caries in pre-school children has significant public health and health disparity implications. To determine microbial risk markers for this infection, this study aimed to compare the microbiota of children with early childhood caries with that of caries-free children. Plaque samples from incisors, molars, and the tongue from 195 children attending pediatricians' offices were assayed by 74 DNA probes and by PCR to Streptococcus mutans. Caries-associated factors included visible plaque, child age, race, and snacking habits. Species were detected more frequently from tooth than tongue samples. Lactobacillus gasseri (p < 0.01), Lactobacillus fermentum, Lactobacillus vaginalis, and S. mutans with Streptococcus sobrinus (all p < 0.05) were positively associated with caries. By multifactorial analysis, the probiotic Lactobacillus acidophilus was negatively associated with caries. Prevotella nigrescens was the only species (p < 0.05) significantly associated with caries by the 'false discovery' rate. Analysis of the data suggests that selected Lactobacillus species, in addition to mutans streptococci, are risk markers for early childhood caries.
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Affiliation(s)
- E Kanasi
- Department of Molecular Genetics, The Forsyth Institute, 140 The Fenway, Boston, MA 02115, USA
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Fontana CR, Abernethy AD, Som S, Ruggiero K, Doucette S, Marcantonio RC, Boussios CI, Kent R, Goodson JM, Tanner ACR, Soukos NS. The antibacterial effect of photodynamic therapy in dental plaque-derived biofilms. J Periodontal Res 2009; 44:751-9. [PMID: 19602126 DOI: 10.1111/j.1600-0765.2008.01187.x] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Photodynamic therapy has been advocated as an alternative to antimicrobial agents to suppress subgingival species and to treat periodontitis. Bacteria located within dense biofilms, such as those encountered in dental plaque, have been found to be relatively resistant to antimicrobial therapy. In the present study, we investigated the ability of photodynamic therapy to reduce the number of bacteria in biofilms by comparing the photodynamic effects of methylene blue on human dental plaque microorganisms in the planktonic phase and in biofilms. MATERIAL AND METHODS Dental plaque samples were obtained from 10 subjects with chronic periodontitis. Suspensions of plaque microorganisms from five subjects were sensitized with methylene blue (25 microg/mL) for 5 min then exposed to red light. Multispecies microbial biofilms developed from the same plaque samples were also exposed to methylene blue (25 microg/mL) and the same light conditions as their planktonic counterparts. In a second set of experiments, biofilms were developed with plaque bacteria from five subjects, sensitized with 25 or 50 microg/mL of methylene blue and then exposed to red light. After photodynamic therapy, survival fractions were calculated by counting the number of colony-forming units. RESULTS Photodynamic therapy killed approximately 63% of bacteria present in suspension. By contrast, in biofilms, photodynamic therapy had much less of an effect on the viability of bacteria (32% maximal killing). CONCLUSION Oral bacteria in biofilms are affected less by photodynamic therapy than bacteria in the planktonic phase. The antibacterial effect of photodynamic therapy is reduced in biofilm bacteria but not to the same degree as has been reported for treatment with antibiotics under similar conditions.
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Affiliation(s)
- C R Fontana
- Applied Molecular Photomedicine Laboratory, The Forsyth Institute, Boston, MA 02115, USA
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Niyogi S, Kent R, Wood CM. Effects of water chemistry variables on gill binding and acute toxicity of cadmium in rainbow trout (Oncorhynchus mykiss): A biotic ligand model (BLM) approach. Comp Biochem Physiol C Toxicol Pharmacol 2008; 148:305-14. [PMID: 18577468 DOI: 10.1016/j.cbpc.2008.05.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2007] [Revised: 05/30/2008] [Accepted: 05/30/2008] [Indexed: 11/30/2022]
Abstract
This study investigated the short-term (3 h) cadmium binding characteristics of the gills, as well as the influence of various water chemistry variables [calcium, magnesium, sodium, pH, alkalinity and dissolved organic carbon (DOC)] on short-term gill accumulation and acute toxicity of cadmium in juvenile freshwater rainbow trout. The cadmium binding pattern revealed two types of cadmium binding sites in the gill: (i) saturable high affinity sites operating at a low range of waterborne cadmium concentration, and (ii) non-saturable low affinity sites operating at a higher range of cadmium concentration. Among the water chemistry variables tested, only calcium and DOC significantly reduced both gill accumulation and toxicity of cadmium. Interestingly, alkalinity (15-90 mg L(-1) as CaCO(3)) did not influence the gill cadmium accumulation but a significant increase in toxicity was recorded at a higher alkalinity level (90 mg L(-1)). Affinity constants (log K) for binding of competing cations (Cd(2+) and Ca(2+)) to the biotic ligand and for binding of Cd(2+) to DOC were derived separately from the 3 h gill binding tests and the 96 h toxicity tests. In general, the values agreed well, indicating that both tests targeted the same population of high affinity binding sites, which are likely Ca(2+) uptake sites on the gills. These parameters were then incorporated into a geochemical speciation model (MINEQL+) to develop a biotic ligand model for predicting acute toxicity of cadmium in trout. The model predictions exhibited a good fit with the measured toxicity data except for high alkalinity and pH.
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Affiliation(s)
- Som Niyogi
- Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada S7N 5E2.
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Abstract
Periodontal infections have a microbial etiology. Association of species with early disease would be useful in determining which microbes initiate periodontitis. We hypothesized that the microbiota of subgingival and tongue samples would differ between early periodontitis and health. A cross-sectional evaluation of 141 healthy and early periodontitis adults was performed with the use of oligonucleotide probes and PCR. Most species differed in associations with sample sites; most subgingival species were associated with subgingival samples. Few species were detected more frequently in early periodontitis by DNA probes. Porphyromonas gingivalis and Tannerella forsythia (Tannerella forsythensis) were associated with early periodontitis by direct PCR. In conclusion, the microbiota of tongue samples was less sensitive than that of subgingival samples in detecting periodontal species, and there was overlap in species detected in health and early periodontitis. Detection of periodontal pathogens in early periodontitis suggests an etiology similar to that of more advanced disease.
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Affiliation(s)
- A C R Tanner
- Department of Molecular Genetics, The Forsyth Institute, Boston, MA 02115, USA.
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Bibeau C, Bayramian A, Armstrong P, Ault E, Beach R, Benapfl M, Campbell R, Dawson J, Ebbers C, Freitas B, Kent R, Liao Z, Ladran T, Menapace J, Molander B, Moses E, Oberhelman S, Payne S, Peterson N, Schaffers K, Stolz C, Sutton S, Tassano J, Telford S, Utterback E, Randles M, Chai B, Fei Y. The mercury laser system – An average power, gas-cooled, Yb:S-FAP based system with frequency conversion and wavefront correction. ACTA ACUST UNITED AC 2006. [DOI: 10.1051/jp4:2006133161] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Wang S, Poster C, Brede C, Lange A, Lange D, Kent R. Human body tolerance to high energy impacts: Influence of occupant torso tissue composition on real world crash injuries. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83536-0] [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: 11/30/2022]
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Kent R, Stacey S, Mattice J, Kindig M, Forman J, Woods W, Evans J. Assessment of abdominal injury criteria for use with pediatric seatlbelt loading. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83546-3] [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: 10/24/2022]
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Makkuni D, Kent R, Watts R, Clunie G. Two cases of serious food-borne infection in patients treated with anti-TNF-α. Are we doing enough to reduce the risk? Rheumatology (Oxford) 2005; 45:237-8. [PMID: 16377730 DOI: 10.1093/rheumatology/kei123] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Farrokhyar F, Wang X, Kent R, Lamy A. 272: Postoperative Risk of Mortality after Coronary Artery Bypass Graft (CABG) Surgery in Canada; the Euroscore and the STS Algorithms. Am J Epidemiol 2005. [DOI: 10.1093/aje/161.supplement_1.s68c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- F Farrokhyar
- Department of Surgery, McMaster University, Hamilton, Canada
| | - X Wang
- Department of Surgery, McMaster University, Hamilton, Canada
| | - R Kent
- Department of Surgery, McMaster University, Hamilton, Canada
| | - A Lamy
- Department of Surgery, McMaster University, Hamilton, Canada
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Hicks DB, Wang Z, Wei Y, Kent R, Guffanti AA, Banciu H, Bechhofer DH, Krulwich TA. A tenth atp gene and the conserved atpI gene of a Bacillus atp operon have a role in Mg2+ uptake. Proc Natl Acad Sci U S A 2003; 100:10213-8. [PMID: 12917488 PMCID: PMC193541 DOI: 10.1073/pnas.1832982100] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2003] [Indexed: 11/18/2022] Open
Abstract
The atp operon of alkaliphilic Bacillus pseudofirmus OF4, as in most prokaryotes, contains the eight structural genes for the F-ATPase (ATP synthase), which are preceded by an atpI gene that encodes a membrane protein of unknown function. A tenth gene, atpZ, has been found in this operon, which is upstream of and overlapping with atpI. Most Bacillus species, and some other bacteria, possess atpZ homologues. AtpZ is predicted to be a membrane protein with a hairpin topology, and was detected by Western analyses. Deletion of atpZ, atpI, or atpZI from B. pseudofirmus OF4 led to a requirement for a greatly increased concentration of Mg2+ for growth at pH 7.5. Either atpZ, atpI, or atpZI complemented the similar phenotype of a triple mutant of Salmonella typhimurium (MM281), which is deficient in Mg2+ uptake. atpZ and atpI, separately and together, increased the Mg2+-sensitive 45Ca2+ uptake by vesicles of an Escherichia coli mutant that is defective in Ca2+ and Na+ efflux. We hypothesize that AtpZ and AtpI, as homooligomers, and perhaps as heterooligomers, are Mg2+ transporter, Ca2+ transporter, or channel proteins. Such proteins could provide Mg2+, which is required by ATP synthase, and also support charge compensation, when the enzyme is functioning in the hydrolytic direction; e.g., during cytoplasmic pH regulation.
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Affiliation(s)
- David B Hicks
- Department of Pharmacology and Biological Chemistry, Mount Sinai School of Medicine, New York, NY 10029, USA
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Farrokhyar F, Kent R, Wang S, Smith K, Cheung A, Mullen J, Carrier M, Baillot R, Lamy A. Adherence to guidelines for lipid-lowering therapy after coronary artery bypass grafting (CABG): Canadian off-pump CABG registry. Ann Epidemiol 2003. [DOI: 10.1016/s1047-2797(03)00178-9] [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: 11/25/2022]
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Sundkvist T, Smith A, Mahgoub H, Kirkby A, Kent R, Wreghitt T, Davidkin I. Outbreak of hepatitis A infection among intravenous drug users in Suffolk and suspected risk factors. Commun Dis Public Health 2003; 6:101-5. [PMID: 12889287] [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: 03/04/2023]
Abstract
A prolonged outbreak of hepatitis A infection amongst drug users in Suffolk prompted a study of the natural immunity against hepatitis A in this population, and a retrospective analysis of the relationship between specific drug-taking behaviours and the risk of hepatitis A infection. Prior to the outbreak, age-specific seroprevalence of hepatitis A IgG in drug users was similar to that amongst blood donors in the region. Of those without effective immunity, intravenous drug users, multiple drug users and those injecting frequently were more likely to have developed hepatitis. The reported frequency of equipment sharing and the number of injecting partners were not related to the risk of infection. The potential for blood-to-blood, and a suggested faecal-blood transmission were considered to be important in propagating the outbreak in this population. We suggest that a single dose of hepatitis A vaccine administered opportunistically should be used in outbreaks involving drug users.
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Affiliation(s)
- T Sundkvist
- Communicable Disease Control Team, Suffolk Public Health Network, St Clements Hospital, PO Box 170, Foxhall Road, Ipswich, Suffolk IP3 8LS.
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Tanner ACR, Milgrom PM, Kent R, Mokeem SA, Page RC, Liao SIA, Riedy CA, Bruss JB. Similarity of the oral microbiota of pre-school children with that of their caregivers in a population-based study. Oral Microbiol Immunol 2002; 17:379-87. [PMID: 12485330 DOI: 10.1034/j.1399-302x.2002.170608.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study evaluated the similarity between the oral microbiota of young children and that of their adult caregivers. Oral samples from children (174 dentate and 18 pre-dentate) aged 6-36 months and their caregivers in Saipan were assayed using a DNA probe assay. Many species including Streptococcus mutans, Streptococcus sobrinus, Actinomyces species, Campylobacter rectus, Fusobacterium nucleatum, Prevotella intermedia, and Porphyromonas gingivalis were detected in dentate and pre-dentate children, whereas Bacteroides forsythus was detected only in dentate children. A higher percentage of children were positive for the detection of an individual species if the caregiver was also positive. There were significant relative risks of species detection between dentate children and their caregivers. By logistic regression, there were significant positive associations between species detection in caregiver and in child, but not between species detection and child age or maternal education level. In conclusion, dental pathogens were detected in young, including pre-dentate, children. The microbial profiles of children were strongly associated with the microbiota of their caregivers.
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Pasto DJ, Kent R. Solvent Effect Studies on the Ionization Constants of Phenylmercapto-, Phenylsulfinyl-, and Phenylsulfonylacetic Acids. J Org Chem 2002. [DOI: 10.1021/jo01019a042] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
This study determined the frequency with which 38 microbial species were detected in 171 randomly selected children from 6 to 36 months of age. Children were sampled and dental caries measured. Oral samples were assayed by means of a checkerboard DNA probe assay. The detection frequencies from tongue samples in children under 18 mos were: S. mutans 70%, S. sobrinus 72%, P. gingivalis 23%, B. forsythus 11%, and A. actinomycetemcomitans 30%, with similar detection frequencies in children over 18 mos. Thus, S. mutans and the periodontal pathogens, P. gingivalis and B. forsythus, were detected even in the youngest subjects. Species associated with caries included S. mutans (children ages 18-36 mos) and A. israelii (children ages < 18 mos), the latter species possibly reflecting increased plaque in children with caries. Species detection from tooth and tongue samples was highly associated, with most species detected more frequently from tongue than from tooth samples in children under 18 mos, suggesting that the tongue was a potential microbial reservoir.
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Tanner A, Milgrom P, Kent R, Mokeem S, Page R, Riedy C, Weinstein P, Bruss J. The Microbiota of Young Children from Tooth and Tongue Samples. J Dent Res 2002. [DOI: 10.1177/154405910208100112] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Nasci RS, Newton NH, Terrillion GF, Parsons RE, Dame DA, Miller JR, Ninivaggi DV, Kent R. Interventions: vector control and public education: panel discussion. Ann N Y Acad Sci 2001; 951:235-54. [PMID: 11797780 DOI: 10.1111/j.1749-6632.2001.tb02700.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R S Nasci
- Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado 80522, USA
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Alevizos I, Mahadevappa M, Zhang X, Ohyama H, Kohno Y, Posner M, Gallagher GT, Varvares M, Cohen D, Kim D, Kent R, Donoff RB, Todd R, Yung CM, Warrington JA, Wong DT. Oral cancer in vivo gene expression profiling assisted by laser capture microdissection and microarray analysis. Oncogene 2001; 20:6196-204. [PMID: 11593428 DOI: 10.1038/sj.onc.1204685] [Citation(s) in RCA: 174] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2001] [Revised: 05/23/2001] [Accepted: 05/31/2001] [Indexed: 01/28/2023]
Abstract
Large scale gene expression profiling was carried out on laser capture microdissected (LCM) tumor and normal oral epithelial cells and analysed on high-density oligonucleotide microarrays. About 600 genes were found to be oral cancer associated. These oral cancer associated genes include oncogenes, tumor suppressors, transcription factors, xenobiotic enzymes, metastatic proteins, differentiation markers, and genes that have not been implicated in oral cancer. The database created provides a verifiable global profile of gene expression during oral carcinogenesis, revealing the potential role of known genes as well as genes that have not been previously implicated in oral cancer.
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Affiliation(s)
- I Alevizos
- Department of Oral Medicine and Diagnostic Sciences, Division of Oral Pathology, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA
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Smith KM, Lamy A, Arthur HM, Gafni A, Kent R. Outcomes and costs of coronary artery bypass grafting: comparison between octogenarians and septuagenarians at a tertiary care centre. CMAJ 2001; 165:759-64. [PMID: 11584563 PMCID: PMC81453] [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: 02/21/2023] Open
Abstract
BACKGROUND Decision-making related to coronary artery bypass grafting (CABG) in elderly patients is hampered by inadequate outcome data. We compared the clinical outcomes of octogenarians with those of septuagenarians who underwent CABG. Our secondary objective was to compare the costs associated with CABG in these groups. METHODS We conducted a retrospective database review of patients 70 years of age and older who had undergone CABG at a regional cardiac surgical centre in Hamilton, Ont., between July 1, 1997, and Apr. 30, 2000. A total of 1034 patients were divided into 3 age groups: young septuagenarians (aged 70-74 years), old septuagenarians (aged 75-79) and those 80 and older. Costs were determined in a subset of 773 patients with the use of a case-costing system for cardiac surgery developed at our institution. RESULTS The 3 groups were similar with respect to sex distribution and preoperative risk factors. Urgency scores at referral differed significantly between the groups, with the young septuagenarians demonstrating the lowest risk (mean score [and standard deviation] 4.48 [1.3] in that group, 4.28 [1.4] in the old septuagenarian group and 4.11 [1.2] in the octogenarian group). The rates of all complications combined were similar between the 3 groups (27.1%, 28.1% and 29.6% in the young and old septuagenarian groups and the octogenarian group respectively). There were no significant differences between the 3 groups in the mean number of grafts per patient (3.0, 3.1 and 3.0 respectively), the rate of postoperative death (3.3%, 5.7% and 4.2%), the mean length of stay (11.7, 13.4 and 12.6 days) or the incidence of postoperative myocardial infarction (4.5%, 3.4% and 4.2%). The total cost of CABG per patient did not differ significantly between the 3 groups. INTERPRETATION Given that patients who are accepted for CABG represent a selected population, our findings suggest that, with careful triage, CABG in octogenarians is as safe as, and no more costly than, CABG in septuagenarians.
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Affiliation(s)
- K M Smith
- CADENCE Research Group, Hamilton Health Sciences Corporation-General Division, Hamilton, Ont
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Shintani S, Mihara M, Terakado N, Nakahara Y, Matsumura T, Kohno Y, Ohyama H, McBride J, Kent R, Todd R, Tsuji T, Wong DT. Reduction of p12DOC-1 expression is a negative prognostic indicator in patients with surgically resected oral squamous cell carcinoma. Clin Cancer Res 2001; 7:2776-82. [PMID: 11555592] [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: 02/21/2023]
Abstract
PURPOSE p12DOC-1 is a growth suppressor that negatively regulates cyclin-dependent kinase 2 (CDK2) activities. Expression of p12DOC-1 is reduced and/or lost in tumor tissues. The purpose of this study is to correlate in vivo the expression of p12DOC-1 in oral cancer tissues by immunohistochemistry with clinical and pathological parameters. EXPERIMENTAL DESIGN Twenty-five cases of normal oral mucosa and 127 cases of oral squamous cell carcinomas were evaluated. Patients' charts were reviewed for clinical, pathological, and 10-year survival data. Because p12DOC-1 is a growth suppressor and associates with CDK2, parallel immunostaining was done for proliferating cell nuclear antigen and CDK2 to evaluate cell proliferation and potential correlation with CDK2. RESULTS Our results showed that strong p12DOC-1 staining was uniformly seen in normal oral mucosa. p12DOC-1 staining was reduced or absent in 81 cases (63.8%) of oral squamous cell carcinomas. Decreased p12DOC-1 staining (<25% of cells stained) correlated with tumor mode of invasion (P = 0.001) and higher proliferating cell nuclear antigen (P = 0.0028) and CDK2 (P = 0.0020) expression. Survival analysis showed significant correlation of low p12DOC-1 expression with the risk of cervical lymph node metastasis (P = 0.001) and patients' 10-year survival status (P = 0.0214). CONCLUSIONS These results allow us to conclude that reduction of p12DOC-1 protein expression is a frequent event in oral cancers. Intratumor immunohistochemical evaluation of p12DOC-1 expression can be an adjunctive prognostic indicator for patients with oral cancer.
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Affiliation(s)
- S Shintani
- Laboratory of Molecular Pathology, Division of Oral Pathology, Department of Oral Medicine and Diagnostic Sciences, Harvard School of Dental Medicine, Boston, MA 02115, USA
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McEntire R, Karp P, Abernethy N, Benton D, Helt G, DeJongh M, Kent R, Kosky A, Lewis S, Hodnett D, Neumann E, Olken F, Pathak D, Tarczy-Hornoch P, Toldo L, Topaloglou T. An evaluation of ontology exchange languages for bioinformatics. Proc Int Conf Intell Syst Mol Biol 2001; 8:239-50. [PMID: 10977085] [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: 02/17/2023]
Abstract
Ontologies are specifications of the concepts in a given field, and of the relationships among those concepts. The development of ontologies for molecular-biology information and the sharing of those ontologies within the bioinformatics community are central problems in bioinformatics. If the bioinformatics community is to share ontologies effectively, ontologies must be exchanged in a form that uses standardized syntax and semantics. This paper reports on an effort among the authors to evaluate alternative ontology-exchange languages, and to recommend one or more languages for use within the larger bioinformatics community. The study selected a set of candidate languages, and defined a set of capabilities that the ideal ontology-exchange language should satisfy. The study scored the languages according to the degree to which they satisfied each capability. In addition, the authors performed several ontology-exchange experiments with the two languages that received the highest scores: OML and Ontolingua. The result of those experiments, and the main conclusion of this study, was that the frame-based semantic model of Ontolingua is preferable to the conceptual graph model of OML, but that the XML-based syntax of OML is preferable to the Lisp-based syntax of Ontolingua.
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Affiliation(s)
- R McEntire
- SmithKline Beecham Pharmaceuticals, King of Prussia, PA 19406, USA.
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Gilmour R, Messner P, Guffanti AA, Kent R, Scheberl A, Kendrick N, Krulwich TA. Two-dimensional gel electrophoresis analyses of pH-dependent protein expression in facultatively alkaliphilic Bacillus pseudofirmus OF4 lead to characterization of an S-layer protein with a role in alkaliphily. J Bacteriol 2000; 182:5969-81. [PMID: 11029415 PMCID: PMC94729 DOI: 10.1128/jb.182.21.5969-5981.2000] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The large majority of proteins of alkaliphilic Bacillus pseudofirmus OF4 grown at pH 7.5 and 10.5, as studied by two-dimensional gel electrophoresis analyses, did not exhibit significant pH-dependent variation. A new surface layer protein (SlpA) was identified in these studies. Although the prominence of some apparent breakdown products of SlpA in gels from pH 10.5-grown cells led to discovery of the alkaliphile S-layer, the largest and major SlpA forms were present in large amounts in gels from pH 7.5-grown cells as well. slpA RNA abundance was, moreover, unchanged by growth pH. SlpA was similar in size to homologues from nonalkaliphiles but contained fewer Arg and Lys residues. An slpA mutant strain (RG21) lacked an exterior S-layer that was identified in the wild type by electron microscopy. Electrophoretic analysis of whole-cell extracts further indicated the absence of a 90-kDa band in the mutant. This band was prominent in wild-type extracts from both pH 7.5- and 10.5-grown cells. The wild type grew with a shorter lag phase than RG21 at either pH 10.5 or 11 and under either Na(+)-replete or suboptimal Na(+) concentrations. The extent of the adaptation deficit increased with pH elevation and suboptimal Na(+). By contrast, the mutant grew with a shorter lag and faster growth rate than the wild type at pH 7. 5 under Na(+)-replete and suboptimal Na(+) conditions, respectively. Logarithmically growing cells of the two strains exhibited no significant differences in growth rate, cytoplasmic pH regulation, starch utilization, motility, Na(+)-dependent transport of alpha-aminoisobutyric acid, or H(+)-dependent synthesis of ATP. However, the capacity for Na(+)-dependent pH homeostasis was diminished in RG21 upon a sudden upward shift of external pH from 8. 5 to 10.5. The energy cost of retaining the SlpA layer at near-neutral pH is apparently adverse, but the constitutive presence of SlpA enhances the capacity of the extremophile to adjust to high pH.
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Affiliation(s)
- R Gilmour
- Department of Biochemistry and Molecular Biology, Mount Sinai School of Medicine, New York, New York 10029, USA
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Abstract
For many patients, the outcome of rehabilitation following amputation depends substantially on comorbidity. This is particularly so where amputation is performed because of peripheral vascular disease which may involve other end-organs, but also applies in trauma where loss of limb may not be the only injury. In evaluating outcome, measures must take account of the very different goals for rehabilitation. These may range from cosmesis or the simple ability to transfer from bed to chair, to successful competition in the Para-Olympics. Rehabilitation programmes for amputees are not simply prosthetic services, but must take account of the whole patient, their goals and ambitions. Research to date has made a contribution in identifying prognostic factors for prosthetic rehabilitation, thus helping to target limited resources. Controlled studies are still required, however, to establish the optimum services to offer to different groups of patients.
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Affiliation(s)
- R Kent
- Hunters Moor Rehabilitation Centre, Newcastle, UK
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van Ruyven FO, Lingström P, van Houte J, Kent R. Relationship among mutans streptococci, "low-pH" bacteria, and lodophilic polysaccharide-producing bacteria in dental plaque and early enamel caries in humans. J Dent Res 2000; 79:778-84. [PMID: 10728980 DOI: 10.1177/00220345000790021201] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Multiple interactions occur among major determinants of dental caries. We have studied the bacterial flora and pH-lowering capacity of the same dental plaques in relation to caries. The findings on the plaque flora are reported here. The buccal surfaces of upper teeth in each subject were selected for study. A low-caries group had no "white spot" caries (ws) in the selected dentition area; a higher-caries group averaged 4.1 ws in this area. The latter group was divided into subjects with 2, 3, or 4 ws and subjects with 5, 6, or 7 ws. Enumerated organisms in plaque samples (sound and ws sites) from all subjects were: (1) mutans streptococci (MS) on mitis-salivarius-bacitracin and mitis-salivarius agar; (2) non-mutans streptococci (non-MS) on mitis-salivarius agar; (3) organisms that were categorized according to their minimum pH in sugar broth, i.e., the predominant undifferentiated total flora on blood agar or the predominant non-MS flora on mitis-salivarius agar; and (4) iodophilic polysaccharide-storing organisms on trypticase-yeast extract-salts agar. Plaques covering ws lesions contained generally only low proportions (< 0.1%) of MS. The plaque proportions of all the above 4 bacterial groups were increased in the higher-caries group but were similar for s and ws sites in this group. Over half of the total plaque flora in subjects with 5, 6, or 7 ws consisted of "low-pH"-type organisms (minimum pH < 4.4). Many of these were neither MS nor "low-pH" non-MS. The numerical emergence of MS in plaque appeared to be preceded often by other types of "low-pH" bacteria, including the non-MS. Caries development in the absence or presence of MS as well as different bacterial successions in plaque can be explained readily by the dynamic and positive relationship among the factors carbohydrate consumption, plaque flora composition, plaque acidogenic potential, and caries activity.
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Affiliation(s)
- F O van Ruyven
- Department of Oral Microbiology, The Forsyth Institute, Boston, Massachusetts 02115, USA
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Abstract
Dental caries appears to result from the action of multiple, interrelated factors. A companion study dealt with the plaque-flora/caries relationship (van Ruyven et al., 2000). The plaque-pH/caries relationship is the subject of this study. Since both studies involve the same subjects, plaques, and tooth surfaces, data on the examined factors have also been integrated. In vivo plaque pH determinations (microelectrode) were done on buccal sound (s) and "white-spot" (ws) caries surfaces in a selected dentition area in a low-caries (no ws) and higher-caries subject group. The pH response to sugar was evaluated before and after a sugar rinse, a local sugar application, or sucking on a sugary lozenge. pH profiles with sugar rinsing and normal or limited salivary flow conditions, showed progressively decreasing plaque pH values at various time points in the order of: low-caries subjects (s sites), higher-caries subjects (s sites), higher-caries subjects (s + ws sites), and higher-caries subjects (ws sites). The minimum pH values showed the same trend. Analyses of all data indicated only a statistical difference for minimum values for s sites in low-caries subjects vs. ws sites in higher-caries subjects, and for s and ws sites in the latter. Local sugar application and sucking on a sugary lozenge induced smaller pH drops than sugar rinsing; such suboptimal sugar exposure caused a disappearance of the difference between the minimum pH values for s and ws sites observed with sugar rinsing in the higher-caries subjects. Initial plaque pH values were similar regardless of subject or tooth caries status. The values were also not correlated with the plaque levels of strongly iodophilic polysaccharide-storing bacteria. Collectively, both studies indicate that increasing subject caries status is characterized by increasing plaque levels of highly-acid-tolerant, acidogenic bacteria and an increasing plaque-pH-lowering potential and support the dynamic relationship between these parameters.
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Affiliation(s)
- P Lingström
- Department of Cariology, Faculty of Odontology, Göteborg University, Sweden.
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Crandall J, Kent R, Patrie J, Fertile J, Martin P. Rib fracture patterns and radiologic detection--a restraint-based comparison. Annu Proc Assoc Adv Automot Med 2000; 44:235-59. [PMID: 11558086 PMCID: PMC3217385] [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: 02/21/2023]
Abstract
This paper presents a study of the rib fracture patterns generated in simulated frontal collisions and the visibility of the rib fractures on plain film radiographs. Using 29 cadaver subjects, rib fractures were identified on oblique, lateral, and anteroposterior chest films by five radiologists independently and were compared with fractures found during a detailed necropsy. Physical, geometric, and experimental factors demonstrated an influence on the ability of a radiologist to identify rib fractures on an x-ray. Specifically, the restraint system configuration, the total number of fractures, the circumferential location of the fracture, the rib number, and the aspect (right or left) affected fracture identification. The results verify that torso belt loading produces rib fractures generally located along the path of the belt whereas superimposed airbag loading results in a more distributed and posterolateral fracture pattern. A higher proportion of rib fractures was identified on x-ray for occupants restrained by only a belt (44% of fractures) than for occupants restrained by both a belt and an airbag (24% of fractures). Overall, less than 40% of the rib fractures were detected upon an initial examination of radiographs. After being provided with the location of all fractures, detection increased to 49%. On average, occult rib fractures resulted in an average underreporting of injury severity of more than one AIS level.
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Affiliation(s)
- J Crandall
- Automobile Safety Laboratory, University of Virginia, Charlottesville, Virginia, USA
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Papas A, Russell D, Singh M, Stack K, Kent R, Triol C, Winston A. Double blind clinical trial of a remineralizing dentifrice in the prevention of caries in a radiation therapy population. Gerodontology 1999; 16:2-10. [PMID: 10687503 DOI: 10.1111/j.1741-2358.1999.00002.x] [Citation(s) in RCA: 29] [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: 11/30/2022]
Abstract
OBJECTIVES The purpose of this study is to determine the efficacy and safety of a specially formulated remineralizing toothpaste in controlling caries in a group of high risk, head and neck radiation patients. DESIGN The study compares the performance of the remineralizing toothpaste with a leading conventional fluoride dentifrice using double-blind randomization. TEST PRODUCTS: The products compared both contain equivalent quantities of fluoride (1150 ppm). The remineralizing toothpaste also delivers soluble calcium and phosphate ions, the essential components of teeth. SUBJECTS On completion, 50 subjects who received > 50 Gy of radiation to the head and neck. MEASUREMENTS Examinations include coronal and root caries using the Pitts Diagnostic Criteria, salivary flow rate, plaque and gingival indices and microbiological counts over one year. RESULTS At this point subjects are enrolled in the study at various phases. However, the current average for the net increment per month per subject is -0.12 (+/- 1.30) for coronal caries and 0.06 (+/- 0.73) for root caries in subjects using the remineralizing toothpaste and 0.53 (+/- 1.62) for coronal caries and 0.45 (+/- 0.98) for root caries in subjects using the conventional fluoride dentifrice. Non-parametric analysis of rank scores for net root surface increments/month was statistically significant (p = 0.02), suggesting lower net root surface increment/month for the remineralizing toothpaste relative to the conventional toothpaste. No significant differences were noted on coronal surfaces. CONCLUSIONS The results to date indicate that the remineralizing toothpaste is significantly superior to the conventional fluoride dentifrice in preventing root caries in high risk patients.
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Affiliation(s)
- A Papas
- Tufts University School of Dental Medicine, Boston, USA.
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48
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Jenkins TD, Mueller A, Odze R, Shahsafaei A, Zukerberg LR, Kent R, Stoner GD, Rustgi AK. Cyclin D1 overexpression combined with N-nitrosomethylbenzylamine increases dysplasia and cellular proliferation in murine esophageal squamous epithelium. Oncogene 1999; 18:59-66. [PMID: 9926920 DOI: 10.1038/sj.onc.1202296] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We previously described the oral-esophageal tissue-specific expression of cyclin D1 with the Epstein-Barr virus ED-L2 promoter in transgenic mice, and resulting dysplasia. Given the evidence for an interplay between environmental and genetic factors in esophageal squamous carcinogenesis, the aim of this study was to determine the potential cooperation of the nitrosamine compound N-nitrosomethylbenzylamine (NMBA), an esophageal specific carcinogen, in the cyclin D1 transgenic mice. NMBA was first demonstrated to induce dysplasia in two strains of inbred mice, C57BL/6 and FVB/N. Subcutaneous NMBA was then administrated to wild type and transgenic mice beginning at 4 weeks of age. Mice were monitored for the duration of the study for general appearance, activity and weight, and were euthanized at 12 and 15 months. Histopathologic analysis revealed increased severity of dysplasia in cyclin D1 mice treated with NMBA compared with treated age-matched wild-type mice and untreated mice. There was also increased proliferating cell nuclear antigen (PCNA) expression in the esophagi of NMBA treated cyclin D1 mice. Taken together, these findings suggest that a genetic alteration, specifically cyclin D1 overexpression and a chemical carinogen, NMBA, may cooperate to increase the severity of esophageal squamous dysplasia, a prominent precursor to carcinoma.
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Affiliation(s)
- T D Jenkins
- Gastrointestinal Unit, Massachusetts General Hospital, Harvard Medical School, Boston, USA
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Martin IR, Wickens K, Patchett K, Kent R, Fitzharris P, Siebers R, Lewis S, Crane J, Holbrook N, Town GI, Smith S. Cat allergen levels in public places in New Zealand. N Z Med J 1998; 111:356-8. [PMID: 11039820] [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: 02/18/2023]
Abstract
AIMS Cat allergen (Fel d 1) is a known risk factor for asthma. Studies have demonstrated Fel d 1 in both public buildings and domestic dwellings where cats have never been. The aims of this study were to measure reservoir Fel d 1 levels in public buildings in New Zealand, to examine determinants of these levels and to compare them with previously measured domestic levels. METHODS Dust was obtained in two centres (Wellington and Christchurch) from hotels, hospitals, rest homes, churches, primary schools, childcare centres, cinemas, bank head offices and aeroplanes; and from North Island ski lodges. Measurements of temperature and relative humidity were taken. Information was collected on building characteristics. Fel d 1 levels (microg/g of fine dust) for floors (n=203), beds (n=64) and seats (n=24) were expressed as geometric means (95% confidence intervals). RESULTS Detectable Fel d 1 levels were found in 95% of floor samples, 91% of bed samples and 100% of seat samples. Fel d 1 levels [geometric mean (95% confidence intervals)] were significantly higher on cinema and domestic aircraft seats [36.8 (20.8-65.3) microg/g and 33.3 (28.0-39.7) microg/g respectively] than on floors [3.6 (2.5-5.1) microg/g and 2.4 (1.8-3.0) microg/g respectively]. Floor Fel d 1 levels in the public buildings sampled were lower than those of domestic dwellings without cats [0.9 (0.6-1.4) microg/g vs 1.7 (1.2-2.4)] microg/g in Wellington and [2.0 (1.6-2.6) microg/g vs 4.0 (2.7-6.0] microg/g in Christchurch. After controlling for potential confounders, floor Fel d 1 levels were higher with carpeted floors (p<0.001) and lower in banks and hospitals (p<0.001). CONCLUSION Fel d 1 levels in public buildings are low in New Zealand public places except for cinema and domestic aircraft seats where all but one sample had Fel d 1 levels potentially high enough to precipitate asthma symptoms in sensitised individuals.
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Affiliation(s)
- I R Martin
- Canterbury Respiratory Research Group, Christchurch Hospital.
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Dibart S, Skobe Z, Snapp KR, Socransky SS, Smith CM, Kent R. Identification of bacterial species on or in crevicular epithelial cells from healthy and periodontally diseased patients using DNA-DNA hybridization. Oral Microbiol Immunol 1998; 13:30-5. [PMID: 9573819 DOI: 10.1111/j.1399-302x.1998.tb00747.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The purpose of this investigation was to identify bacterial species present on or in crevicular epithelial cells in healthy and diseased sites using DNA probes. In order to achieve this aim, further improvements were made in the separation of unattached bacteria from those adherent to epithelial cells isolated from the human gingival crevice or periodontal pocket. Then the DNA probes were used to determine the prevalence of detectable DNA from 15 microbial species on or in crevicular epithelial cells. One sample was taken from a single subgingival site in each of 51 individuals ranging in age from 19 to 45 years. Samples were taken from 27 sites of clinically healthy subjects and 24 samples were taken from subjects having periodontally diseased sites. DNA-DNA hybridization indicated that a majority of epithelial cells from healthy sites (63%) were in contact with or harbored Streptococcus oralis. On the other hand, species such as Bacteroides forsythus, Prevotella intermedia, Capnocytophaga ochracea and Campylobacter rectus were more frequently detected in elevated numbers in periodontally diseased sites. Cluster analysis of the microbial profiles generally aggregated subjects with and without periodontitis into separate cluster groups. The cluster patterns suggest the possibility that microbial complexes will be, in part, determined by the receptors available on the epithelial cells.
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Affiliation(s)
- S Dibart
- Department of Periodontology, Boston University, Goldman School for Graduate Dentistry, MA 02118, USA
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