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Salminen AT, Davis KJ, Felton RP, Nischal N, VonTungeln LS, Beland FA, Derr K, Brown PC, Ferrer M, Katz LM, Kleinstreuer NC, Leshin J, Manga P, Sadrieh N, Xia M, Fitzpatrick SC, Camacho L. Parallel evaluation of alternative skin barrier models and excised human skin for dermal absorption studies in vitro. Toxicol In Vitro 2023; 91:105630. [PMID: 37315744 PMCID: PMC10527924 DOI: 10.1016/j.tiv.2023.105630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/24/2023] [Accepted: 06/09/2023] [Indexed: 06/16/2023]
Abstract
Skin permeation is a primary consideration in the safety assessment of cosmetic ingredients, topical drugs, and human users handling veterinary medicinal products. While excised human skin (EHS) remains the 'gold standard' for in vitro permeation testing (IVPT) studies, unreliable supply and high cost motivate the search for alternative skin barrier models. In this study, a standardized dermal absorption testing protocol was developed to evaluate the suitability of alternative skin barrier models to predict skin absorption in humans. Under this protocol, side-by-side assessments of a commercially available reconstructed human epidermis (RhE) model (EpiDerm-200-X, MatTek), a synthetic barrier membrane (Strat-M, Sigma-Aldrich), and EHS were performed. The skin barrier models were mounted on Franz diffusion cells and the permeation of caffeine, salicylic acid, and testosterone was quantified. Transepidermal water loss (TEWL) and histology of the biological models were also compared. EpiDerm-200-X exhibited native human epidermis-like morphology, including a characteristic stratum corneum, but had an elevated TEWL as compared to EHS. The mean 6 h cumulative permeation of a finite dose (6 nmol/cm2) of caffeine and testosterone was highest in EpiDerm-200-X, followed by EHS and Strat-M. Salicylic acid permeated most in EHS, followed by EpiDerm-200-X and Strat-M. Overall, evaluating novel alternative skin barrier models in the manner outlined herein has the potential to reduce the time from basic science discovery to regulatory impact.
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Affiliation(s)
- Alec T Salminen
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Kelly J Davis
- Toxicologic Pathology Associates, Jefferson, AR, USA
| | - Robert P Felton
- Office of Scientific Coordination, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Nathania Nischal
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Linda S VonTungeln
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Frederick A Beland
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Kristy Derr
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Paul C Brown
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Marc Ferrer
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Linda M Katz
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Nicole C Kleinstreuer
- National Toxicology Program Interagency Center for the Evaluation of Alternative Toxicological Methods, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Jonathan Leshin
- Center for Veterinary Medicine, U.S. Food and Drug Administration, Rockville, MD, USA
| | - Prashiela Manga
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Nakissa Sadrieh
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Menghang Xia
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, USA
| | - Suzanne C Fitzpatrick
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Luísa Camacho
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA.
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2
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Hu SC, Min S, Kang HK, Yang DJ, Basavarajappa M, Lewis SM, Davis KJ, Patton RE, Bryant MS, Sepehr E, Trbojevich R, Pearce MG, Bishop ME, Ding W, Heflich RH, Maisha MP, Felton R, Chemerynski S, Yee SB, Coraggio M, Rosenfeldt H, Yeager RP, Howard PC, Tang Y. 90-day nose-only inhalation toxicity study of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in Sprague-Dawley rats. Food Chem Toxicol 2022; 160:112780. [PMID: 34965465 DOI: 10.1016/j.fct.2021.112780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 12/17/2021] [Accepted: 12/22/2021] [Indexed: 11/29/2022]
Abstract
4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is one of the key tobacco-specific nitrosamines that plays an important role in human lung carcinogenesis. Repeated dose inhalation toxicity data on NNK, particularly relevant to cigarette smoking, however, is surprisingly limited. Hence, there is a lack of direct information available on the carcinogenic and potential non-carcinogenic effects of NNK via inhalational route exposure. In the present study, the subchronic inhalation toxicity of NNK was evaluated in Sprague Dawley rats. Both sexes (9-10 weeks age; 23 rats/sex/group) were exposed by nose-only inhalation to air, vehicle control (75% propylene glycol), or 0.2, 0.8, 3.2, or 7.8 mg/kg body weight (BW)/day of NNK (NNK aerosol concentrations: 0, 0, 0.0066, 0.026, 0.11, or 0.26 mg/L air) for 1 h/day for 90 consecutive days. Toxicity was evaluated by assessing body weights; food consumption; clinical pathology; histopathology; organ weights; blood, urine, and tissue levels of NNK, its major metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), and their glucuronides (reported as total NNK, tNNK, and total NNAL, tNNAL, respectively); tissue levels of the DNA adduct O6-methylguanine; blood and bone marrow micronucleus (MN) frequency; and bone marrow DNA strand breaks (comet assay). The results showed that NNK exposure caused multiple significant adverse effects, with the most sensitive endpoint being non-neoplastic lesions in the nose. Although the genotoxic biomarker O6-methylguanine was detected, genotoxicity from NNK exposure was negative in the MN and comet assays. The Lowest-Observed-Adverse-Effect-Level (LOAEL) was 0.8 mg/kg BW/day or 0.026 mg/L air of NNK for 1 h/day for both sexes. The No-Observed-Adverse-Effect-Level (NOAEL) was 0.2 mg/kg BW/day or 0.0066 mg/L air of NNK for 1 h/day for both sexes. The results of this study provide new information relevant to assessing the human exposure hazard of NNK.
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Affiliation(s)
- Shu-Chieh Hu
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Seonggi Min
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Hyun-Ki Kang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Dong-Jin Yang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Mallikarjuna Basavarajappa
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Sherry M Lewis
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR, 72079, USA
| | - Ralph E Patton
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR, 72079, USA
| | - Matthew S Bryant
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Estatira Sepehr
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Raul Trbojevich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Mason G Pearce
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Michelle E Bishop
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Wei Ding
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Robert H Heflich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - MacKean P Maisha
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Robert Felton
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Susan Chemerynski
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Steven B Yee
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Melis Coraggio
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Hans Rosenfeldt
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - R Philip Yeager
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Paul C Howard
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA
| | - Yunan Tang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR, 72079, USA.
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Desai VG, Vijay V, Han T, Moland CL, Phanavanh B, Lee T, Davis KJ, Muskhelishvili L, Stine KC, Fuscoe JC. Doxorubicin-induced delayed-onset subclinical cardiotoxicity in mice. J Appl Toxicol 2021; 42:778-792. [PMID: 34668590 DOI: 10.1002/jat.4256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 09/21/2021] [Accepted: 09/28/2021] [Indexed: 12/22/2022]
Abstract
Subclinical cardiotoxicity at low total cumulative doxorubicin (DOX) doses can manifest into cardiomyopathy in long-term cancer survivors. However, the underlying mechanisms are poorly understood. In male B6C3F1 mice, assessment of cardiac function by echocardiography was performed at 1, 4, 10, 17, and 24 weeks after exposure to 6, 9, 12, and 24 mg/kg total cumulative DOX doses or saline (SAL) to monitor development of delayed-onset cardiotoxicity. The 6- or 9-mg/kg total cumulative doses resulted in a significant time-dependent decline in systolic function (left ventricular ejection fraction (LVEF) and fractional shortening (FS)) during the 24-week recovery although there was not a significant alteration in % LVEF or % FS at any specific time point during the recovery. A significant decline in systolic function was elicited by the cardiotoxic cumulative DOX dose (24 mg/kg) during the 4- to 24-week period after treatment compared to SAL-treated counterparts. At 24 weeks after DOX treatment, a significant dose-related decrease in the expression of genes and proteins involved in sarcoplasmic reticulum (SR) calcium homeostasis (Ryr2 and Serca2) was associated with a dose-related increase in the transcript level of Casp12 (SR-specific apoptosis) in hearts. These mice also showed enhanced apoptotic activity in hearts indicated by a significant dose-related elevation in the number of apoptotic cardiomyocytes compared to SAL-treated counterparts. These findings collectively suggest that a steady decline in SR calcium handling and apoptosis might be involved in the development of subclinical cardiotoxicity that can evolve into irreversible cardiomyopathy later in life.
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Affiliation(s)
- Varsha G Desai
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Vikrant Vijay
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Tao Han
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Carrie L Moland
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Bounleut Phanavanh
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Taewon Lee
- Division of Applied Mathematical Sciences, Korea University, Sejong, South Korea
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, Arkansas, USA
| | - Levan Muskhelishvili
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, Arkansas, USA
| | - Kimo C Stine
- Department of Pediatrics, Pediatric Hematology-Oncology, Arkansas Children's Hospital, Little Rock, Arkansas, USA
| | - James C Fuscoe
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
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Hu SC, Bryant MS, Sepehr E, Kang HK, Trbojevich R, Lagaud G, Mehta D, Ding W, Mittelstaedt RA, Pearce MG, Bishop ME, Davis KJ, Lewis SM, Chemerynski S, Yee SB, Coraggio M, Rosenfeldt H, Yeager RP, Howard PC, Tang Y. Toxicokinetic and Genotoxicity Study of NNK in Male Sprague Dawley Rats Following Nose-Only Inhalation Exposure, Intraperitoneal Injection, and Oral Gavage. Toxicol Sci 2021; 182:10-28. [PMID: 33944952 DOI: 10.1093/toxsci/kfab049] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The tobacco-specific nitrosamine NNK [4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone] is found in tobacco products and tobacco smoke. NNK is a potent genotoxin and human lung carcinogen; however, there are limited inhalation data for the toxicokinetics (TK) and genotoxicity of NNK in vivo. In the present study, a single dose of 5 × 10-5, 5 × 10-3, 0.1, or 50 mg/kg body weight (BW) of NNK, 75% propylene glycol (vehicle control), or air (sham control) was administered to male Sprague-Dawley (SD) rats (9-10 weeks age) via nose-only inhalation (INH) exposure for 1 h. For comparison, the same doses of NNK were administered to male SD rats via intraperitoneal injection (IP) and oral gavage (PO). Plasma, urine, and tissue specimens were collected at designated time points and analyzed for levels of NNK and its major metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) and tissue levels of DNA adduct O6-methylguanine by LC/MS/MS. TK data analysis was performed using a non-linear regression program. For the genotoxicity subgroup, tissues were collected at 3 h post-dosing for comet assay analysis. Overall, the TK data indicated that NNK was rapidly absorbed and metabolized extensively to NNAL after NNK administration via the three routes. The IP route had the greatest systemic exposure to NNK. NNK metabolism to NNAL appeared to be more efficient via INH than IP or PO. NNK induced significant increases in DNA damage in multiple tissues via the three routes. The results of this study provide new information and understanding of the TK and genotoxicity of NNK.
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Affiliation(s)
- Shu-Chieh Hu
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Matthew S Bryant
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Estatira Sepehr
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Hyun-Ki Kang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Raul Trbojevich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Guy Lagaud
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Darshan Mehta
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Wei Ding
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Roberta A Mittelstaedt
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Mason G Pearce
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Michelle E Bishop
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, USA
| | - Sherry M Lewis
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Susan Chemerynski
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Steven B Yee
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Melis Coraggio
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Hans Rosenfeldt
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - R Philip Yeager
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD 20993, USA
| | - Paul C Howard
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
| | - Yunan Tang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR 72079
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5
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Hu SC, Min S, Kang HK, Yang DJ, Lewis SM, Davis KJ, Patton RE, Bryant MS, Sepehr E, Trbojevich R, Pearce MG, Bishop ME, Heflich RH, Maisha MP, Felton R, Chemerynski S, Yee SB, Coraggio M, Rosenfeldt H, Yeager RP, Howard PC, Tang Y. 14-Day Nose-Only Inhalation Toxicity and Haber's Rule Study of NNK in Sprague-Dawley Rats. Toxicol Sci 2021; 183:319-337. [PMID: 34329464 DOI: 10.1093/toxsci/kfab094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is one of the key tobacco-specific nitrosamines that plays an important role in human lung carcinogenesis. However, repeated inhalation toxicity data on NNK, which is more directly relevant to cigarette smoking, are currently limited. In the present study, the subacute inhalation toxicity of NNK was evaluated in Sprague Dawley rats. Both sexes (9-10 weeks age; 16 rats/sex/group) were exposed by nose-only inhalation to air, vehicle control (75% propylene glycol), or 0.8, 3.2, 12.5, or 50 mg/kg body weight (BW)/day of NNK (NNK aerosol concentrations: 0, 0, 0.03, 0.11, 0.41, or 1.65 mg/L air) for 1 hour/day for 14 consecutive days. Toxicity was evaluated by assessing body and organ weights; food consumption; clinical pathology; histopathology observations; blood, urine, and tissue levels of NNK, its major metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), and their glucuronides (reported as total NNK, tNNK, and total NNAL, tNNAL, respectively); O6-methylguanine DNA adduct formation; and blood and bone marrow micronucleus frequency. Whether the subacute inhalation toxicity of NNK followed Haber's Rule was also determined using additional animals exposed 4 hours/day. The results showed that NNK exposure caused multiple significant adverse effects, with the most sensitive endpoint being non-neoplastic histopathological lesions in the nose. The lowest-observed-adverse-effect level (LOAEL) was 0.8 mg/kg BW/day or 0.03 mg/L air for 1 hour/day for both sexes. An assessment of Haber's Rule indicated that 14-day inhalation exposure to the same dose at a lower concentration of NNK aerosol for a longer time (4 hours daily) resulted in greater adverse effects than exposure to a higher concentration of NNK aerosol for a shorter time (1 hour daily).
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Affiliation(s)
- Shu-Chieh Hu
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Seonggi Min
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Hyun-Ki Kang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Dong-Jin Yang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Sherry M Lewis
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR
| | - Ralph E Patton
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR
| | - Matthew S Bryant
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Estatira Sepehr
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Raul Trbojevich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Mason G Pearce
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Michelle E Bishop
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Robert H Heflich
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - MacKean P Maisha
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Robert Felton
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Susan Chemerynski
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Steven B Yee
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Melis Coraggio
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Hans Rosenfeldt
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - R Philip Yeager
- The Center for Tobacco Products (CTP), U.S. Food and Drug Administration, Silver Spring, MD
| | - Paul C Howard
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
| | - Yunan Tang
- National Center for Toxicological Research (NCTR), U.S. Food and Drug Administration (FDA), Jefferson, AR
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6
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Leakey JEA, Ali AA, Babb AR, Badgley HL, Davis KJ, Juliar BE, Leakey TI, Lewis SM, Patton RE, Seng JE. Subchronic toxicity evaluation of glucosamine and glucosamine in combination with chondroitin sulfate in obese Zucker rats. Toxicol Appl Pharmacol 2021; 412:115371. [PMID: 33345901 DOI: 10.1016/j.taap.2020.115371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 12/11/2020] [Accepted: 12/14/2020] [Indexed: 12/17/2022]
Abstract
D-glucosamine is a widely consumed dietary supplement used to promote joint health and treat osteoarthritis. It also stimulates intracellular hexosamine flux and increases transforming growth factor β1 (TGFβ1) mRNA expression and insulin resistance in animal studies. The effects of D-glucosamine exposure were investigated in obese Zucker rats. Male (leprfa/leprfa) Zucker rats were exposed to 30, 120, 300 and 600 mg D-glucosamine HCl per kg/day either alone or with chondroitin sulfate (24, 96, 240 and 480 mg/kg/day respectively) for 90 days. After 4 weeks exposure, these doses produced CmaxD-glucosamine concentrations of up to 24 μM in tail vein serum concurrent with a transient 30% increase in blood glucose concentration in the 600 mg/kg/day dose group. D-Glucosamine did not significantly alter body weight, blood glucose or serum insulin levels at any dose tested after 13 weeks exposure, but did increase urinary TGFβ1 concentrations. The Zucker rats developed nephropathy and scrotal sores that were related to their hyperglycemia and obesity, and D-glucosamine exposure exacerbated these conditions to a small extent. The incidence of pulmonary osseous metaplasia was increased in rats exposed to D-glucosamine and a single incidence of adrenal osseous metaplasia was noted in one animal exposed to 600/480 mg D-glucosamine HCl/chondroitin sulfate. These lesions may have been treatment related. These studies suggest that the risk of adverse effects of oral D-glucosamine is small compared to that of hyperglycemia in these animals, but the potential for TGFβ1-mediated pathologies, such as osseous metaplasia and renal nephropathy may be increased.
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Affiliation(s)
- Julian E A Leakey
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America.
| | - A Afshan Ali
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Amy R Babb
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Heidi L Badgley
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Kelly J Davis
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Beth E Juliar
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Tatiana I Leakey
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Sherry M Lewis
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Ralph E Patton
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - John E Seng
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
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Guerrero AM, Barnes M, Bodin Ö, Chadès I, Davis KJ, Iftekhar MS, Morgans C, Wilson KA. Key considerations and challenges in the application of social-network research for environmental decision making. Conserv Biol 2020; 34:733-742. [PMID: 31943349 DOI: 10.1111/cobi.13461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 10/20/2019] [Accepted: 11/22/2019] [Indexed: 06/10/2023]
Abstract
Attempts to better understand the social context in which conservation and environmental decisions are made has led to increased interest in human social networks. To improve the use of social-network analysis in conservation, we reviewed recent studies in the literature in which such methods were applied. In our review, we looked for problems in research design and analysis that limit the utility of network analysis. Nineteen of 55 articles published from January 2016 to June 2019 exhibited at least 1 of the following problems: application of analytical methods inadequate or sensitive to incomplete network data; application of statistical approaches that ignore dependency in the network; or lack of connection between the theoretical base, research question, and choice of analytical techniques. By drawing attention to these specific areas of concern and highlighting research frontiers and challenges, including causality, network dynamics, and new approaches, we responded to calls for increasing the rigorous application of social science in conservation.
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Affiliation(s)
- A M Guerrero
- ARC Centre of Excellence for Environmental Decisions, The University of Queensland, 4072, QLD, Brisbane, Australia
- Centre for Biodiversity and Conservation Science, The University of Queensland, 4072, QLD, Brisbane, Australia
- School of Biological Sciences, The University of Queensland, 4072, QLD, Brisbane, Australia
| | - M Barnes
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, 4811, QLD, Townsville, Australia
| | - Ö Bodin
- Stockholm Resilience Centre, Stockholm University, SE-106 91, Stockholm, Sweden
| | - I Chadès
- ARC Centre of Excellence for Environmental Decisions, The University of Queensland, 4072, QLD, Brisbane, Australia
- CSIRO, Ecosciences Precinct, 4102, QLD, Dutton Park, Australia
| | - K J Davis
- ARC Centre of Excellence for Environmental Decisions, The University of Queensland, 4072, QLD, Brisbane, Australia
- Centre for Biodiversity and Conservation Science, The University of Queensland, 4072, QLD, Brisbane, Australia
- Land, Environment, Economics and Policy Institute, University of Exeter Business School, EX4 4PU, Exeter, Xfi Building, Rennes Drive, U.K
| | - M S Iftekhar
- Centre for Environmental Economics & Policy, UWA School of Agriculture & Environment, M087, The University of Western Australia, 6009, WA, Perth, Australia
| | - C Morgans
- ARC Centre of Excellence for Environmental Decisions, The University of Queensland, 4072, QLD, Brisbane, Australia
- Centre for Biodiversity and Conservation Science, The University of Queensland, 4072, QLD, Brisbane, Australia
- School of Biological Sciences, The University of Queensland, 4072, QLD, Brisbane, Australia
| | - K A Wilson
- ARC Centre of Excellence for Environmental Decisions, The University of Queensland, 4072, QLD, Brisbane, Australia
- School of Biological Sciences, The University of Queensland, 4072, QLD, Brisbane, Australia
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8
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Jenkins GR, Lee T, Moland CL, Vijay V, Herman EH, Lewis SM, Davis KJ, Muskhelishvili L, Kerr S, Fuscoe JC, Desai VG. Sex-related differential susceptibility to doxorubicin-induced cardiotoxicity in B6C3F 1 mice. Toxicol Appl Pharmacol 2016; 310:159-174. [PMID: 27644598 DOI: 10.1016/j.taap.2016.09.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/02/2016] [Accepted: 09/13/2016] [Indexed: 01/03/2023]
Abstract
Sex is a risk factor for development of cardiotoxicity, induced by the anti-cancer drug, doxorubicin (DOX), in humans. To explore potential mechanisms underlying differential susceptibility to DOX between sexes, 8-week old male and female B6C3F1 mice were dosed with 3mg/kg body weight DOX or an equivalent volume of saline via tail vein once a week for 6, 7, 8, and 9 consecutive weeks, resulting in 18, 21, 24, and 27mg/kg cumulative DOX doses, respectively. At necropsy, one week after each consecutive final dose, the extent of myocardial injury was greater in male mice compared to females as indicated by higher plasma concentrations of cardiac troponin T at all cumulative DOX doses with statistically significant differences between sexes at the 21 and 24mg/kg cumulative doses. A greater susceptibility to DOX in male mice was further confirmed by the presence of cytoplasmic vacuolization in cardiomyocytes, with left atrium being more vulnerable to DOX cardiotoxicity. The number of TUNEL-positive cardiomyocytes was mostly higher in DOX-treated male mice compared to female counterparts, showing a statistically significant sex-related difference only in left atrium at 21mg/kg cumulative dose. DOX-treated male mice also had an increased number of γ-H2A.X-positive (measure of DNA double-strand breaks) cardiomyocytes compared to female counterparts with a significant sex effect in the ventricle at 27mg/kg cumulative dose and right atrium at 21 and 27mg/kg cumulative doses. This newly established mouse model provides a means to identify biomarkers and access potential mechanisms underlying sex-related differences in DOX-induced cardiotoxicity.
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Affiliation(s)
- G Ronald Jenkins
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States
| | - Taewon Lee
- Department of Mathematics, Korea University, Sejong, Republic of Korea
| | - Carrie L Moland
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States
| | - Vikrant Vijay
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States
| | - Eugene H Herman
- Toxicology and Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, The National Cancer Institute, Rockville, MD 20850-9734, United States
| | - Sherry M Lewis
- Office of Scientific Coordination, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, United States
| | - Levan Muskhelishvili
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, United States
| | - Susan Kerr
- Arkansas Heart Hospital, Little Rock, AR 72211, United States
| | - James C Fuscoe
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States
| | - Varsha G Desai
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, United States.
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9
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Delclos KB, Camacho L, Lewis SM, Vanlandingham MM, Latendresse JR, Olson GR, Davis KJ, Patton RE, Gamboa da Costa G, Woodling KA, Bryant MS, Chidambaram M, Trbojevich R, Juliar BE, Felton RP, Thorn BT. Toxicity Evaluation of Bisphenol A Administered by Gavage to Sprague Dawley Rats From Gestation Day 6 Through Postnatal Day 90. Toxicol Sci 2016; 153:212. [PMID: 27506224 DOI: 10.1093/toxsci/kfw123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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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10
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Ding W, Bishop ME, Lyn-Cook LE, Davis KJ, Manjanatha MG. In Vivo Alkaline Comet Assay and Enzyme-modified Alkaline Comet Assay for Measuring DNA Strand Breaks and Oxidative DNA Damage in Rat Liver. J Vis Exp 2016. [PMID: 27166647 DOI: 10.3791/53833] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Unrepaired DNA damage can lead to genetic instability, which in turn may enhance cancer development. Therefore, identifying potential DNA damaging agents is important for protecting public health. The in vivo alkaline comet assay, which detects DNA damage as strand breaks, is especially relevant for assessing the genotoxic hazards of xenobiotics, as its responses reflect the in vivo absorption, tissue distribution, metabolism and excretion (ADME) of chemicals, as well as DNA repair process. Compared to other in vivo DNA damage assays, the assay is rapid, sensitive, visual and inexpensive, and, by converting oxidative DNA damage into strand breaks using specific repair enzymes, the assay can measure oxidative DNA damage in an efficient and relatively artifact-free manner. Measurement of DNA damage with the comet assay can be performed using both acute and subchronic toxicology study designs, and by integrating the comet assay with other toxicological assessments, the assay addresses animal welfare requirements by making maximum use of animal resources. Another major advantage of the assays is that they only require a small amount of cells, and the cells do not have to be derived from proliferating cell populations. The assays also can be performed with a variety of human samples obtained from clinically or occupationally exposed individuals.
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Affiliation(s)
- Wei Ding
- Division of Genetic and Molecular Toxicology, US FDA/National Center for Toxicological Research;
| | - Michelle E Bishop
- Division of Genetic and Molecular Toxicology, US FDA/National Center for Toxicological Research
| | - Lascelles E Lyn-Cook
- Division of Genetic and Molecular Toxicology, US FDA/National Center for Toxicological Research
| | - Kelly J Davis
- Toxicologic Pathology Associates, US FDA/National Center for Toxicological Research
| | - Mugimane G Manjanatha
- Division of Genetic and Molecular Toxicology, US FDA/National Center for Toxicological Research
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11
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Boudreau MD, Imam MS, Paredes AM, Bryant MS, Cunningham CK, Felton RP, Jones MY, Davis KJ, Olson GR. Differential Effects of Silver Nanoparticles and Silver Ions on Tissue Accumulation, Distribution, and Toxicity in the Sprague Dawley Rat Following Daily Oral Gavage Administration for 13 Weeks. Toxicol Sci 2016; 150:131-60. [PMID: 26732888 DOI: 10.1093/toxsci/kfv318] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
There are concerns within the regulatory and research communities regarding the health impact associated with consumer exposure to silver nanoparticles (AgNPs). This study evaluated particulate and ionic forms of silver and particle size for differences in silver accumulation, distribution, morphology, and toxicity when administered daily by oral gavage to Sprague Dawley rats for 13 weeks. Test materials and dose formulations were characterized by transmission electron microscopy (TEM), dynamic light scattering, and inductively coupled mass spectrometry (ICP-MS). Seven-week-old rats (10 rats per sex per group) were randomly assigned to treatments: AgNP (10, 75, and 110 nm) at 9, 18, and 36 mg/kg body weight (bw); silver acetate (AgOAc) at 100, 200, and 400 mg/kg bw; and controls (2 mM sodium citrate (CIT) or water). At termination, complete necropsies were conducted, histopathology, hematology, serum chemistry, micronuclei, and reproductive system analyses were performed, and silver accumulations and distributions were determined. Rats exposed to AgNP did not show significant changes in body weights or intakes of feed and water relative to controls, and blood, reproductive system, and genetic tests were similar to controls. Differences in the distributional pattern and morphology of silver deposits were observed by TEM: AgNP appeared predominantly within cells, while AgOAc had an affinity for extracellular membranes. Significant dose-dependent and AgNP size-dependent accumulations were detected in tissues by ICP-MS. In addition, sex differences in silver accumulations were noted for a number of tissues and organs, with accumulations being significantly higher in female rats, especially in the kidney, liver, jejunum, and colon.
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Affiliation(s)
| | | | | | | | | | - Robert P Felton
- Bioinformatics and Biostatistics Division, National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas; and
| | | | - Kelly J Davis
- Toxicologic Pathology Associates, Jefferson Laboratories, Jefferson, Arkansas
| | - Greg R Olson
- Toxicologic Pathology Associates, Jefferson Laboratories, Jefferson, Arkansas
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12
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Ding W, Levy DD, Bishop ME, Pearce MG, Davis KJ, Jeffrey AM, Duan JD, Williams GM, White GA, Lyn-Cook LE, Manjanatha MG. In vivo genotoxicity of estragole in male F344 rats. Environ Mol Mutagen 2015; 56:356-365. [PMID: 25361439 DOI: 10.1002/em.21918] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 10/03/2014] [Indexed: 06/04/2023]
Abstract
Estragole, a naturally occurring constituent of various herbs and spices, is a rodent liver carcinogen which requires bio-activation. To further understand the mechanisms underlying its carcinogenicity, genotoxicity was assessed in F344 rats using the comet, micronucleus (MN), and DNA adduct assays together with histopathological analysis. Oxidative damage was measured using human 8-oxoguanine-DNA-N-glycosylase (hOGG1) and EndonucleaseIII (EndoIII)-modified comet assays. Results with estragole were compared with the structurally related genotoxic carcinogen, safrole. Groups of seven-week-old male F344 rats received corn oil or corn oil containing 300, 600, or 1,000 mg/kg bw estragole and 125, 250, or 450 mg/kg bw safrole by gavage at 0, 24, and 45 hr and terminated at 48 hr. Estragole-induced dose-dependent increases in DNA damage following EndoIII or hOGG1 digestion and without enzyme treatment in liver, the cancer target organ. No DNA damage was detected in stomach, the non-target tissue for cancer. No elevation of MN was observed in reticulocytes sampled from peripheral blood. Comet assays, both without digestion or with either EndoIII or hOGG1 digestion, also detected DNA damage in the liver of safrole-dosed rats. No DNA damage was detected in stomach, nor was MN elevated in peripheral blood following dosing with safrole suggesting that, as far both safrole and estragole, oxidative damage may contribute to genotoxicity. Taken together, these results implicate multiple mechanisms of estragole genotoxicity. DNA damage arises from chemical-specific interaction and is also mediated by oxidative species.
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Affiliation(s)
- Wei Ding
- Division of Genetic and Molecular Toxicology, US FDA/National Center for Toxicological Research, Jefferson, Arkansas
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13
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Desai VG, C Kwekel J, Vijay V, Moland CL, Herman EH, Lee T, Han T, Lewis SM, Davis KJ, Muskhelishvili L, Kerr S, Fuscoe JC. Early biomarkers of doxorubicin-induced heart injury in a mouse model. Toxicol Appl Pharmacol 2014; 281:221-9. [PMID: 25448438 DOI: 10.1016/j.taap.2014.10.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 09/18/2014] [Accepted: 10/11/2014] [Indexed: 01/07/2023]
Abstract
Cardiac troponins, which are used as myocardial injury markers, are released in plasma only after tissue damage has occurred. Therefore, there is a need for identification of biomarkers of earlier events in cardiac injury to limit the extent of damage. To accomplish this, expression profiling of 1179 unique microRNAs (miRNAs) was performed in a chronic cardiotoxicity mouse model developed in our laboratory. Male B6C3F1 mice were injected intravenously with 3mg/kg doxorubicin (DOX; an anti-cancer drug), or saline once a week for 2, 3, 4, 6, and 8weeks, resulting in cumulative DOX doses of 6, 9, 12, 18, and 24mg/kg, respectively. Mice were euthanized a week after the last dose. Cardiac injury was evidenced in mice exposed to 18mg/kg and higher cumulative DOX dose whereas examination of hearts by light microscopy revealed cardiac lesions at 24mg/kg DOX. Also, 24 miRNAs were differentially expressed in mouse hearts, with the expression of 1, 1, 2, 8, and 21 miRNAs altered at 6, 9, 12, 18, and 24mg/kg DOX, respectively. A pro-apoptotic miR-34a was the only miRNA that was up-regulated at all cumulative DOX doses and showed a significant dose-related response. Up-regulation of miR-34a at 6mg/kg DOX may suggest apoptosis as an early molecular change in the hearts of DOX-treated mice. At 12mg/kg DOX, up-regulation of miR-34a was associated with down-regulation of hypertrophy-related miR-150; changes observed before cardiac injury. These findings may lead to the development of biomarkers of earlier events in DOX-induced cardiotoxicity that occur before the release of cardiac troponins.
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Affiliation(s)
- Varsha G Desai
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA.
| | - Joshua C Kwekel
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Vikrant Vijay
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Carrie L Moland
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Eugene H Herman
- Toxicology and Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, The National Cancer Institute, 9609 Medical Center Drive, Rockville, MD 20850-9734, USA
| | - Taewon Lee
- Department of Mathematics, Korea University, Sejong, Chungnam 339-700, Republic of Korea
| | - Tao Han
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Sherry M Lewis
- Office of Scientific Coordination, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Kelly J Davis
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, USA
| | - Levan Muskhelishvili
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, USA
| | - Susan Kerr
- Arkansas Heart Hospital, Little Rock, AR 72211, USA
| | - James C Fuscoe
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
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14
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Thrasher JF, Kim SH, Rose I, Navarro A, Craft MK, Davis KJ, Biggers S. Print Media Coverage around Failed and Successful Tobacco Tax Initiatives: The South Carolina Experience. Am J Health Promot 2014; 29:29-36. [DOI: 10.4278/ajhp.130104-quan-11] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Purpose. Taxes are a critical tobacco control policy, yet little systematic research has determined how mass media represent tobacco taxes. This study aimed to characterize print media coverage of tobacco tax initiatives in South Carolina (SC). Design. Content analysis. Setting. The setting comprised 346 news articles from 2006 to 2010 in the four main SC newspapers. Subjects. N/A Measures. A coding scheme with good inter-rater reliability (α = .90–1.0) assessed article type (news vs. opinion), arguments, and the story tendency regarding whether it was in favor of the tax, against the tax, or neutral/mixed. Analysis. Chi-square tests and t-tests assessed hypotheses regarding the prevalence and number of different arguments and article tendencies across different time periods (i.e., legislature in session vs. not in session; successful vs. unsuccessful initiative) and article types. Results. Most articles were favorable toward the tax (59%), with favorable articles most likely to be found in opinion pieces than in news articles. Compared to unsuccessful tax initiative years (2006 to 2009), articles from the successful year (2010) were more likely to include pro-tax arguments about how the tax can raise state revenues (47% vs. 33%; p = .020) and pay for tobacco control programs (40% vs. 26%; p = .014). Unsuccessful years included a relatively higher percentage of stories about the lack of consensus regarding how the tax money should be spent (25% vs. 11%; p = .014). Within articles, the mean number of arguments favorable toward the tax and the mean number of economic arguments were marginally higher in the successful year compared to the unsuccessful years. Conclusion. Study results suggest that advocates build consensus and communicate more clearly on how tobacco tax revenue streams should be spent.
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Zhang Q, Davis KJ, Hoffmann D, Vaidya VS, Brown RP, Goering PL. Urinary biomarkers track the progression of nephropathy in hypertensive and obese rats. Biomark Med 2014; 8:85-94. [PMID: 24325231 DOI: 10.2217/bmm.13.106] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIMS To determine whether urinary biomarkers of acute kidney injury can be used to monitor the progression of chronic kidney injury in a rat model of hypertension and obesity. MATERIALS & METHODS A suite of novel urinary biomarkers were used to track the progression of kidney damage in SHROB and SHR-lean rats. RESULTS Urinary albumin, NAG, clusterin, osteopontin, RPA-1 and fibrinogen levels were significantly elevated over time and were closely associated with the severity of histopathologically determined nephropathy in both SHROB and SHR-lean rats. CONCLUSION Urinary biomarkers, such as albumin, fibrinogen, NAG, clusterin, RPA-1 and osteopontin, may serve as useful tools to track the progression of chronic kidney disease associated with hypertension and obesity.
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Affiliation(s)
- Qin Zhang
- Center for Devices & Radiological Health, US FDA, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
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16
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Delclos KB, Camacho L, Lewis SM, Vanlandingham MM, Latendresse JR, Olson GR, Davis KJ, Patton RE, Gamboa da Costa G, Woodling KA, Bryant MS, Chidambaram M, Trbojevich R, Juliar BE, Felton RP, Thorn BT. Toxicity evaluation of bisphenol A administered by gavage to Sprague Dawley rats from gestation day 6 through postnatal day 90. Toxicol Sci 2014; 139:174-97. [PMID: 24496637 DOI: 10.1093/toxsci/kfu022] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Bisphenol A (BPA) is a high production volume industrial chemical to which there is widespread human oral exposure. Guideline studies used to set regulatory limits detected adverse effects only at doses well above human exposures and established a no-observed-adverse-effect level (NOAEL) of 5 mg/kg body weight (bw)/day. However, many reported animal studies link BPA to potentially adverse effects on multiple organ systems at doses below the NOAEL. The primary goals of the subchronic study reported here were to identify adverse effects induced by orally (gavage) administered BPA below the NOAEL, to characterize the dose response for such effects and to determine doses for a subsequent chronic study. Sprague Dawley rat dams were dosed daily from gestation day 6 until the start of labor, and their pups were directly dosed from day 1 after birth to termination. The primary focus was on seven equally spaced BPA doses (2.5-2700 μg/kg bw/day). Also included were a naïve control, two doses of ethinyl estradiol (EE2) to demonstrate the estrogen responsiveness of the animal model, and two high BPA doses (100,000 and 300,000 μg/kg bw/day) expected from guideline studies to produce adverse effects. Clear adverse effects of BPA, including depressed gestational and postnatal body weight gain, effects on the ovary (increased cystic follicles, depleted corpora lutea, and antral follicles), and serum hormones (increased serum estradiol and prolactin and decreased progesterone), were observed only at the two high doses of BPA. BPA-induced effects partially overlapped those induced by EE2, consistent with the known weak estrogenic activity of BPA.
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Affiliation(s)
- K Barry Delclos
- Division of Biochemical Toxicology, 3900 NCTR Road, Jefferson, Arkansas 72079
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17
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Levi MS, Patton RE, Hanig JP, Tranter KM, George NI, James LP, Davis KJ, Bowyer JF. Serum myoglobin, but not lipopolysaccharides, is predictive of AMPH-induced striatal neurotoxicity. Neurotoxicology 2013; 37:40-50. [PMID: 23608161 DOI: 10.1016/j.neuro.2013.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 03/19/2013] [Accepted: 04/05/2013] [Indexed: 01/08/2023]
Abstract
Determinants of amphetamine (AMPH)-induced neurotoxicity are poorly understood. The role of lipopolysaccharides (LPS) and organ injury in AMPH-induced neurotoxicity was examined in adult male Sprague-Dawley rats that were give AMPH and became hyperthermic during the exposure. Environmentally-induced hyperthermia (EIH) in the rat was compared to AMPH to determine whether AMPH-induced increases in LPS and peripheral toxicities were solely attributable to hyperthermia. Muscle, liver, and kidney function were determined biochemically at 3h or 1 day after AMPH or EIH exposure and histopathology at 1 day after treatment. Circulating levels of LPS were monitored (via limulus amoebocyte coagulation assay) during AMPH or EIH exposure. Blood LPS levels were detected in 40-50% of the AMPH and EIH rats, but the presence of LPS in the serum had no effect on organ damage or striatal dopamine depletions (neurotoxicity). In both CR and NCTR rats, serum bound urea nitrogen and creatinine levels increased at 3h after EIH or AMPH (2- to 3-fold above control) but subsided by 1 day. Alanine transaminase was increased (indicating liver dysfunction) by both AMPH and EIH at 3 h (2- to 10-fold above control) in CR rats, but the levels were not significantly different between the control and AMPH groups in NCTR animals. Mild liver necrosis was detected in 1 of 7 rats examined in the AMPH group and in 1 of 5 rats examined in the EIH group (only NCTR rats were examined). Serum myoglobin increased (indicating muscle damage) in both CR and NCTR rats at 3h and was more pronounced with AMPH (≈5-fold above control) than EIH. Our results indicate that: (1) "free" blood borne LPS often increases with EIH and AMPH but may not be necessary for striatal neurotoxicity and CNS immune responses; (2) liver or kidney dysfunction may result from muscle damage; however, it is not sufficient nor necessary to produce, but may exacerbate, neurotoxicity; (3) AMPH-induced serum myoglobin release is a potential biomarker and possibly a factor in AMPH-induced toxicity processes.
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Affiliation(s)
- Mark S Levi
- Division of Neurotoxicology, National Center for Toxicological Research, U.S. Food & Drug Administration, Jefferson, AR 72079-9502, USA.
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18
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Desai VG, Herman EH, Moland CL, Branham WS, Lewis SM, Davis KJ, George NI, Lee T, Kerr S, Fuscoe JC. Development of doxorubicin-induced chronic cardiotoxicity in the B6C3F1 mouse model. Toxicol Appl Pharmacol 2012; 266:109-21. [PMID: 23142469 DOI: 10.1016/j.taap.2012.10.025] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Revised: 10/05/2012] [Accepted: 10/12/2012] [Indexed: 10/27/2022]
Abstract
Serum levels of cardiac troponins serve as biomarkers of myocardial injury. However, troponins are released into the serum only after damage to cardiac tissue has occurred. Here, we report development of a mouse model of doxorubicin (DOX)-induced chronic cardiotoxicity to aid in the identification of predictive biomarkers of early events of cardiac tissue injury. Male B6C3F(1) mice were administered intravenous DOX at 3mg/kg body weight, or an equivalent volume of saline, once a week for 4, 6, 8, 10, 12, and 14weeks, resulting in cumulative DOX doses of 12, 18, 24, 30, 36, and 42mg/kg, respectively. Mice were sacrificed a week following the last dose. A significant reduction in body weight gain was observed in mice following exposure to a weekly DOX dose for 1week and longer compared to saline-treated controls. DOX treatment also resulted in declines in red blood cell count, hemoglobin level, and hematocrit compared to saline-treated controls after the 2nd weekly dose until the 8th and 9th doses, followed by a modest recovery. All DOX-treated mice had significant elevations in cardiac troponin T concentrations in plasma compared to saline-treated controls, indicating cardiac tissue injury. Also, a dose-related increase in the severity of cardiac lesions was seen in mice exposed to 24mg/kg DOX and higher cumulative doses. Mice treated with cumulative DOX doses of 30mg/kg and higher showed a significant decline in heart rate, suggesting drug-induced cardiac dysfunction. Altogether, these findings demonstrate the development of DOX-induced chronic cardiotoxicity in B6C3F(1) mice.
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Affiliation(s)
- Varsha G Desai
- Personalized Medicine Branch, Division of Systems Biology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA.
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Ekpenyong CE, Davis KJ, Akpan UP, Daniel NE. Academic stress and menstrual disorders among female undergraduates in Uyo, South Eastern Nigeria - the need for health education. Niger J Physiol Sci 2011; 26:193-198. [PMID: 22547190] [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] [Received: 04/02/2011] [Accepted: 04/02/2011] [Indexed: 05/31/2023]
Abstract
The aim of this study was to determine the association between academic stress and menstrual disorders among female undergraduates in Uyo, South Eastern Nigeria. Three hundred and ninety-three (393) female students of the University of Uyo, ages between 16 and 35 years were randomly selected from different departments in the University, and studied during the 2009/2010 academic session. Menstrual history and Student's Stress Assessment Questionnaire (SSAQ) were used for this assessment. They were distributed for participants to fill out. Prevalence of menstrual disorder among participants was 34.6%. A direct association between menstrual disorder and academic stress was observed. Commonest menstrual disorder was menorrhagia (37.5%). Others were: Pre-menstrual Syndrome (PMS 33.1%), Oligomenorrhea 19.9% and amenorrhea 5.9% (P<0.05). Those who experienced academic stress had about 2 times chances of having menstrual disorders (OR : 2.0, C.I = 1.224-2.837) at P<0.05. This study demonstrated a significant association between academic stress and menstrual disorder among females undergraduate in Uyo, South Eastern Nigeria.
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Abstract
We compared responses of children and parents to determine their level of agreement in a national, population-based survey regarding asthma-related health of US children. A telephone-based survey was conducted in 2004 among a national probability sample of children with current asthma in the United States. To compare responses between parent-child pairs, a subset of 284 children aged 10-15 were interviewed in addition to the parents. This survey collected data on asthma symptom prevalence, physical activity limitations and impact of exercise on asthma, and asthma management including medication use. Paired responses were compared using the kappa (κ) statistic. Overall, parents of 10-15-yr-olds underestimated the burden of asthma experienced by their children, especially the effects on physical activity. More than half (58%) of children replied that exercise was a trigger for their asthma compared to only 35% of parents (κ 0.23). Children were more likely than parents to mention activity limitations, specifically avoiding physical exertion (63% vs. 49%-κ 0.004). Prevalence of symptoms was also underreported by parents relative to children, particularly breathing problems (41% vs. 67%-κ 0.16) and cough (45% vs. 64%-κ 0.14). Maintenance therapy use in the past 4 weeks was reported by 35% of children, whereas 44% of parents believed their children had used maintenance therapy (κ 0.47). Relative to children's self-report, parents underestimated avoidance tactics used by their children with asthma, including exercise and physical activity self-limitation to prevent the onset or worsening of asthma symptoms. Parents also underreported asthma symptoms of their children aged 10-15 years old and were discordant with their children regarding medication use. Increasing regular communication about asthma between child, parent, and physician is warranted to improve asthma control and overall health.
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Affiliation(s)
- K J Davis
- Worldwide Epidemiology, GlaxoSmithKline Research and Development, Five Moore Drive, Research Triangle Park, NC 27709-3398, USA.
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Davis KJ, Kumar D, Wake MC. Pelvic floor dysfunction: a scoping study exploring current service provision in the UK, interprofessional collaboration and future management priorities. Int J Clin Pract 2010; 64:1661-70. [PMID: 20946271 DOI: 10.1111/j.1742-1241.2010.02509.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [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] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE Pelvic floor dysfunction (PFD) has a significant socioeconomic and healthcare cost. This study aimed to investigate current service provision for PFD in the UK, highlighting any gaps and areas for improvement to inform future service improvement. METHODS A three-phase design comprised a scoping literature review, consultation survey with frontline practitioners from four key professional groups and an overarching synthesis. An interpretative analytical framework was informed by the concepts of interdisciplinary and interprofessional collaboration. RESULTS Empirical evidence on PFD service provision is limited. No overarching strategic approach to PFD as a single clinical entity in the UK was identified. Two hundred and forty-three medical, nursing and physiotherapy practitioners from different clinical subspecialties participated in the survey. Access and availability to services, models of delivery and individual practice vary widely within and across the disciplines. Time restrictions, mixed professional attitudes, lack of standardisation and low investment priority were identified as major barriers to optimal service provision. Five overlapping areas for improvement are highlighted: access and availability, team working and collaboration, funding and investment, education, training and research, public and professional awareness. CONCLUSIONS Current services are characterised by a fragmented approach with asynchronous delivery, limited investment and poor interprofessional integration. An improved service delivery model has the potential to improve outcomes through better interdisciplinary collaboration and efficient use of resources.
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Affiliation(s)
- K J Davis
- Department of Community and Health Sciences, Consortium for Healthcare Research, City University, London, UK.
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Johnston AK, Mannino DM, Hagan GW, Davis KJ, Kiri VA. Relationship between lung function impairment and incidence or recurrence of cardiovascular events in a middle-aged cohort. Thorax 2008; 63:599-605. [DOI: 10.1136/thx.2007.088112] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Oswald WB, Geisbert TW, Davis KJ, Geisbert JB, Sullivan NJ, Jahrling PB, Parren PWHI, Burton DR. Neutralizing antibody fails to impact the course of Ebola virus infection in monkeys. PLoS Pathog 2007; 3:e9. [PMID: 17238286 PMCID: PMC1779296 DOI: 10.1371/journal.ppat.0030009] [Citation(s) in RCA: 190] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Accepted: 12/14/2006] [Indexed: 01/12/2023] Open
Abstract
Prophylaxis with high doses of neutralizing antibody typically offers protection against challenge with viruses producing acute infections. In this study, we have investigated the ability of the neutralizing human monoclonal antibody, KZ52, to protect against Ebola virus in rhesus macaques. This antibody was previously shown to fully protect guinea pigs from infection. Four rhesus macaques were given 50 mg/kg of neutralizing human monoclonal antibody KZ52 intravenously 1 d before challenge with 1,000 plaque-forming units of Ebola virus, followed by a second dose of 50 mg/kg antibody 4 d after challenge. A control animal was exposed to virus in the absence of antibody treatment. Passive transfer of the neutralizing human monoclonal antibody not only failed to protect macaques against challenge with Ebola virus but also had a minimal effect on the explosive viral replication following infection. We show that the inability of antibody to impact infection was not due to neutralization escape. It appears that Ebola virus has a mechanism of infection propagation in vivo in macaques that is uniquely insensitive even to high concentrations of neutralizing antibody. Ebola virus is one of the most feared of human pathogens with a mortality that can approach 90% and an extremely rapid disease course that can lead to death within days of infection. Antibodies able to inhibit viral infection in culture, neutralizing antibodies, can typically prevent viral infection in animals and humans when present prior to infection, at sufficient concentration. Such neutralizing antibodies may be provided through passive administration or induced by vaccination. We have previously shown that a human neutralizing antibody can protect guinea pigs against Ebola virus. However, here we show that this antibody does not protect monkeys against Ebola virus and surprisingly appears to have very little impact upon the rapid course of infection, despite being present at very high levels in the blood of the monkeys. We conclude that administering antibody prior to or immediately following exposure to Ebola virus, for example, after an accident in a research setting or a bioterrorist attack, is unlikely to be effective in preventing disease. Recent successes in protecting monkeys against Ebola virus through vaccination may be independent of antibody, or, more likely, critically dependent on the cooperation of antibody and cellular immunity.
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Affiliation(s)
- Wendelien B Oswald
- Departments of Immunology and Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Thomas W Geisbert
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Kelly J Davis
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Joan B Geisbert
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Nancy J Sullivan
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Peter B Jahrling
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, United States of America
| | - Paul W. H. I Parren
- Departments of Immunology and Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - Dennis R Burton
- Departments of Immunology and Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America
- * To whom correspondence should be addressed. E-mail:
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Abstract
Cadherins are ubiquitous cell surface molecules that are expressed in virtually all solid tissues and localize at sites of cell-cell contact. Cadherins form a large and diverse family of adhesion molecules, which play a crucial role in a multitude of cellular processes, including cell-cell adhesion, motility, and cell sorting in maturing organs and tissues, presumably because of their different binding capacity and specificity. Here, we develop a method that probes the biochemical and biophysical properties of the binding interactions between cadherins expressed on the surface of living cells, at the single-molecule level. Single-molecule force spectroscopy reveals that classical cadherins, N-cadherin and E-cadherin, form bonds that display adhesion specificity, and a pronounced difference in adhesion force and reactive compliance, but not in bond lifetime. Moreover, their potentials of interaction, derived from force-spectroscopy measurements, are qualitatively different when comparing the single-barrier energy potential for the dissociation of an N-cadherin-N-cadherin bond with the double-barrier energy potential for an E-cadherin-E-cadherin bond. Together these results suggest that N-cadherin and E-cadherin molecules form homophilic bonds between juxtaposed cells that have significantly different kinetic and micromechanical properties.
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Affiliation(s)
- Porntula Panorchan
- Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
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Abstract
OBJECTIVE To determine the risk factors for and outcomes associated with the rapid decline in lung function in a cohort of elderly US adults. METHODS Data from 4923 adult participants aged 65 years and older at baseline in the Cardiovascular Health Study were analysed. Subjects were classified using a modification of the GOLD criteria for chronic obstructive pulmonary disease (COPD) and a "restricted" category (FEV1/FVC>or=70% and FVC<80% predicted) was added. Cox proportional hazard models were used to determine the risk of lung function decline over 4 years on subsequent mortality and COPD hospital admissions after adjusting for age, race, sex, smoking status, and other factors. RESULTS Of the participants in the initial cohort, 3388 (68.8%) had spirometric tests at the year 4 visit. Participants with GOLD stages 3 or 4 COPD at baseline were less likely than normal subjects to have follow up spirometric tests (52.7% v 77.9%, p<0.01) and were more likely to be in the most rapidly declining quartile of FEV1 (28.2% v 21.3%, p<0.01) with an annual loss of FEV1 of at least 3.5%. Overall, being in the most rapidly declining quartile of FEV1 from baseline to year 4 was associated with an increased risk of admission to hospital for COPD (adjusted hazard ratio (HR) 1.6, 95% confidence interval (CI) 1.3 to 2.0) and all-cause death (adjusted HR 1.5, 95% CI 1.2 to 1.7) over an additional 7 years of follow up. CONCLUSION More rapid decline in lung function is independently associated with a modest increased risk of hospital admissions and deaths from COPD in an elderly cohort of US participants.
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Affiliation(s)
- D M Mannino
- Division of Pulmonary and Critical Care Medicine, University of Kentucky Medical Center, 740 S Limestone, K-528, Lexington, KY 40536, USA.
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Abstract
The objectives of this study is to compile current knowledge about asthma control in children in relation to goals proposed in international guidelines, to elucidate the factors associated with insufficient asthma control and to address the implications for clinical practice. Review of recent worldwide large population epidemiological surveys and clinical asthma studies of more than 20,000 children are the methods used in this study. The studies report high frequencies of sleep disturbances, emergency visits, school absence and limitations of physical activity due to asthma. Only a small percentage of children with asthma reach the goals of good asthma control set out by Global Initiative for Asthma (GINA). There is evidence of underuse of inhaled corticosteroids even in children with moderate or severe persistent asthma and over-reliance on short-acting beta(2)-agonist rescue medication. Both parents and physicians generally overestimate asthma control and have low expectations about the level of achievable control. Many children with asthma are not being managed in accordance with guideline recommendations, and asthma management practices vary widely between countries. Asthma control falls short of guideline recommendations in large proportions of children with asthma worldwide. Simple methods for assessing asthma control in clinical practice are needed. Treatment goals based on raised expectations should be established in partnership with the asthmatic child and the parents. Effective anti-inflammatory treatment should be used more frequently, and patients should be reviewed regularly.
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Affiliation(s)
- P M Gustafsson
- Queen Silvia Children's Hospital, University of Gothenburg, Gothenburg, Sweden.
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Abstract
AIMS To evaluate the impact of adjuvant biofeedback following sphincter surgery. METHODS Thirty-eight patients were randomized into sphincter repair or sphincter repair plus biofeedback groups. Outcome measures included a symptom questionnaire, patient's rating of satisfaction with continence function and improvement, change in continence score, quality of life and anorectal physiology. Endoanal ultrasonography was also performed pre- and post-operatively. RESULTS Immediately following surgery, there was no statistically significant difference in any of the functional or physiological variables between the groups. Continence and patient satisfaction scores improved with a mean difference of -0.48 (95% CI: -3.30-2.33, P = 0.73) and 1.03 (95% CI: -1.40-3.46, P = 0.39), respectively. Only the difference in embarrassment scores reached statistical significance (mean) 0.56 (95% CI: 0.12-0.99, P = 0.014). Resting and squeeze pressures also improved. Thirteen of 14 in the biofeedback and 11 of 17 (control) reported symptomatic improvement. In the biofeedback group, although not statistically significant continence and satisfaction scores improved and were sustained over time. In the control group, continence and satisfaction scores changed little between 3 and 12 months (P = NS). Quality of life measures improved within the biofeedback group but there was no statistical difference between the groups. CONCLUSION Following surgery continence function improves in all patients but adjuvant biofeedback therapy improves quality of life and maintains symptomatic improvement over time.
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Affiliation(s)
- K J Davis
- Department of Surgery and Gastrointestinal Motility, St George's Hospital, London, UK
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Abstract
We measured component and whole-system respiration fluxes in northern hardwood (Acer saccharum Marsh., Tilia americana L., Fraxinus pennsylvanica Marsh.) and aspen (Populus tremuloides Michx.) forest stands in Price County, northern Wisconsin from 1999 through 2002. Measurements of soil, leaf and stem respiration, stem biomass, leaf area and biomass, and vertical profiles of leaf area were combined with biometric measurements to create site-specific respiration models and to estimate component and whole-system respiration fluxes. Hourly estimates of component respiration were based on site measurements of air, soil and stem temperature, leaf mass, sapwood volume and species composition. We also measured whole-system respiration from an above-canopy eddy flux tower. Measured soil respiration rates varied significantly among sites, but not consistently among dominant species (P < 0.05 and P > 0.1). Annual soil respiration ranged from 8.09 to 11.94 Mg C ha(-1) year(-1). Soil respiration varied linearly with temperature (P < 0.05), but not with soil water content (P > 0.1). Stem respiration rates per unit volume and per unit area differed significantly among species (P < 0.05). Stem respiration per unit volume of sapwood was highest in F. pennsylvanica (up to 300 micro mol m(3) s(-1)) and lowest in T. americana (22 micro mol m(3) s(-1)) when measured at peak summer temperatures (27 to 29 degrees C). In northern hardwood stands, south-side stem temperatures were higher and more variable than north-side temperatures during leaf-off periods, but were not different statistically during leaf-on periods. Cumulative annual stem respiration varied by year and species (P < 0.05) and averaged 1.59 Mg C ha(-1) year(-1). Leaf respiration rates varied significantly among species (P < 0.05). Respiration rates per unit leaf mass measured at 30 degrees C were highest for P. tremuloides (38.8 nmol g(-1) s(-1)), lowest for Ulmus rubra Muhlenb. (13.1 nmol g(-1) s(-1)) and intermediate and similar (30.2 nmol g(-1) s(-1)) for T. americana, F. pennsylvanica and Q. rubra. During the growing season, component respiration estimates were dominated by soil respiration, followed by leaf and then stem respiration. Summed component respiration averaged 11.86 Mg C ha(-1) year(-1). We found strong covariance between whole-ecosystem and summed component respiration measurements, but absolute rates and annual sums differed greatly.
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Affiliation(s)
- P V Bolstad
- Department of Forest Resources, University of Minnesota, St. Paul, MN, USA.
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Abstract
BACKGROUND Ischaemic colitis has been associated with co-morbid conditions, medications, vascular surgery and advanced age in case reports and case series. Few data exist on the baseline incidence in the general population or on the increased risk imposed by these risk factors. AIM To systematically review the literature regarding the incidence, prevalence and risk factors for ischaemic colitis. METHODS Searches of bibliographic databases were performed independently by two investigators. Studies were included if they used population-based samples, disease-specific population samples or case-control population-based samples of adults with ischaemic colitis, and reported the incidence, prevalence or risk factors for ischaemic colitis. Eligible articles were reviewed and data were abstracted in a duplicate, independent manner. RESULTS Four studies were identified that reported the general population incidence and four that reported the disease-specific population incidence. The incidence of ischaemic colitis in general populations ranged from 4.5 to 44 cases per 100 000 person-years. The risk was increased two- to four-fold by either prevalent irritable bowel syndrome or chronic obstructive pulmonary disease. The risk was also increased in females and in subjects of 65 years and older. CONCLUSIONS Ischaemic colitis is uncommon in the general population. The effect sizes of the most commonly reported risk factors have not been adequately quantified in population-based studies.
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Geisbert TW, Hensley LE, Larsen T, Young HA, Reed DS, Geisbert JB, Scott DP, Kagan E, Jahrling PB, Davis KJ. Pathogenesis of Ebola hemorrhagic fever in cynomolgus macaques: evidence that dendritic cells are early and sustained targets of infection. Am J Pathol 2004; 163:2347-70. [PMID: 14633608 PMCID: PMC1892369 DOI: 10.1016/s0002-9440(10)63591-2] [Citation(s) in RCA: 447] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Ebola virus (EBOV) infection causes a severe and fatal hemorrhagic disease that in many ways appears to be similar in humans and nonhuman primates; however, little is known about the development of EBOV hemorrhagic fever. In the present study, 21 cynomolgus monkeys were experimentally infected with EBOV and examined sequentially over a 6-day period to investigate the pathological events of EBOV infection that lead to death. Importantly, dendritic cells in lymphoid tissues were identified as early and sustained targets of EBOV, implicating their important role in the immunosuppression characteristic of EBOV infections. Bystander lymphocyte apoptosis, previously described in end-stage tissues, occurred early in the disease-course in intravascular and extravascular locations. Of note, apoptosis and loss of NK cells was a prominent finding, suggesting the importance of innate immunity in determining the fate of the host. Analysis of peripheral blood mononuclear cell gene expression showed temporal increases in tumor necrosis factor-related apoptosis-inducing ligand and Fas transcripts, revealing a possible mechanism for the observed bystander apoptosis, while up-regulation of NAIP and cIAP2 mRNA suggest that EBOV has evolved additional mechanisms to resist host defenses by inducing protective transcripts in cells that it infects. The sequence of pathogenetic events identified in this study should provide new targets for rational prophylactic and chemotherapeutic interventions.
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Affiliation(s)
- Thomas W Geisbert
- United States Army Medical Institute of Infectious Diseases, Fort Detrick, MD 21702-5011, USA.
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Geisbert TW, Young HA, Jahrling PB, Davis KJ, Larsen T, Kagan E, Hensley LE. Pathogenesis of Ebola hemorrhagic fever in primate models: evidence that hemorrhage is not a direct effect of virus-induced cytolysis of endothelial cells. Am J Pathol 2004; 163:2371-82. [PMID: 14633609 PMCID: PMC1892396 DOI: 10.1016/s0002-9440(10)63592-4] [Citation(s) in RCA: 235] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Ebola virus (EBOV) infection causes a severe and often fatal hemorrhagic disease in humans and nonhuman primates. Whether infection of endothelial cells is central to the pathogenesis of EBOV hemorrhagic fever (HF) remains unknown. To clarify the role of endothelial cells in EBOV HF, we examined tissues of 21 EBOV-infected cynomolgus monkeys throughout time, and also evaluated EBOV infection of primary human umbilical vein endothelial cells and primary human lung-derived microvascular endothelial cells in vitro. Results showed that endothelial cells were not early cellular targets of EBOV in vivo, as viral replication was not consistently observed until day 5 after infection, a full day after the onset of disseminated intravascular coagulation. Moreover, the endothelium remained relatively intact even at terminal stages of disease. Although human umbilical vein endothelial cells and human lung-derived microvascular endothelial cells were highly permissive to EBOV replication, significant cytopathic effects were not observed. Analysis of host cell gene response at 24 to 144 hours after infection showed some evidence of endothelial cell activation, but changes were unremarkable considering the extent of viral replication. Together, these data suggest that coagulation abnormalities associated with EBOV HF are not the direct result of EBOV-induced cytolysis of endothelial cells, and are likely triggered by immune-mediated mechanisms.
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Affiliation(s)
- Thomas W Geisbert
- United States Army Medical Institute of Infectious Diseases, Fort Detrick, MD 21702-5011, USA.
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Geisbert TW, Young HA, Jahrling PB, Davis KJ, Kagan E, Hensley LE. Mechanisms underlying coagulation abnormalities in ebola hemorrhagic fever: overexpression of tissue factor in primate monocytes/macrophages is a key event. J Infect Dis 2003; 188:1618-29. [PMID: 14639531 DOI: 10.1086/379724] [Citation(s) in RCA: 281] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2003] [Accepted: 06/09/2003] [Indexed: 01/27/2023] Open
Abstract
Disseminated intravascular coagulation is a prominent manifestation of Ebola virus (EBOV) infection. Here, we report that tissue factor (TF) plays an important role in triggering the hemorrhagic complications that characterize EBOV infections. Analysis of samples obtained from 25 macaques showed increased levels of TF associated with lymphoid macrophages, whereas analysis of peripheral blood-cell RNA showed increased levels of TF transcripts by day 3. Plasma from macaques contained increased numbers of TF-expressing membrane microparticles. Dysregulation of the fibrinolytic system developed during the course of infection, including a rapid decrease in plasma levels of protein C. Infection of primary human monocytes/macrophages (PHMs) was used to further evaluate the role of TF in EBOV infections. Analysis of PHM RNA at 1-48 h showed increased TF transcripts, whereas levels of TF protein were dramatically increased by day 2. Thus, chemotherapeutic strategies aimed at controlling overexpression of TF may ameliorate the effects of EBOV hemorrhagic fever.
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Affiliation(s)
- Thomas W Geisbert
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, USA 21702-5011.
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Abstract
Ebola virus (EBOV) causes acute hemorrhagic fever that is fatal in up to 90% of cases in both humans and nonhuman primates. No vaccines or treatments are available for human use. We evaluated the effects in nonhuman primates of vaccine strategies that had protected mice or guinea pigs from lethal EBOV infection. The following immunogens were used: RNA replicon particles derived from an attenuated strain of Venezuelan equine encephalitis virus (VEEV) expressing EBOV glycoprotein and nucleoprotein; recombinant Vaccinia virus expressing EBOV glycoprotein; liposomes containing lipid A and inactivated EBOV; and a concentrated, inactivated whole-virion preparation. None of these strategies successfully protected nonhuman primates from robust challenge with EBOV. The disease observed in primates differed from that in rodents, suggesting that rodent models of EBOV may not predict the efficacy of candidate vaccines in primates and that protection of primates may require different mechanisms.
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MESH Headings
- Animals
- Antibodies, Viral/blood
- Ebolavirus/immunology
- Encephalitis Virus, Venezuelan Equine/genetics
- Genetic Vectors/genetics
- Glycoproteins/biosynthesis
- Glycoproteins/genetics
- Glycoproteins/immunology
- Hemorrhagic Fever, Ebola/immunology
- Hemorrhagic Fever, Ebola/pathology
- Hemorrhagic Fever, Ebola/prevention & control
- Hemorrhagic Fever, Ebola/virology
- Immunization
- Macaca/immunology
- Macaca/virology
- Macaca fascicularis/immunology
- Macaca fascicularis/virology
- Macaca mulatta/immunology
- Macaca mulatta/virology
- Nucleoproteins/genetics
- Nucleoproteins/immunology
- Replicon/genetics
- Vaccines, Attenuated/administration & dosage
- Vaccines, Attenuated/immunology
- Vaccines, Synthetic/administration & dosage
- Vaccines, Synthetic/immunology
- Viral Proteins/genetics
- Viral Proteins/immunology
- Viral Vaccines/administration & dosage
- Viral Vaccines/immunology
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Affiliation(s)
- Thomas W Geisbert
- U.S. Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Fort Detrick, MD 21702-5011, USA.
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Abstract
Spontaneous amyloidosis occurs in many nonhuman primate species but remains difficult to diagnose and treat. Nonhuman primates continue to offer promise as animal models in which to study amyloidosis in humans. Amyloidosis was not diagnosed clinically but was found histologically in four male and 36 female baboons. The baboons averaged 18 years of age at death (range, 7-28 years). Clinical signs, if present, were hyperglycemia and cachexia. Blood glucose values were elevated in 12 of 30 baboons with available clinical pathology data. Four baboons had been clinically diagnosed as diabetic and three were treated with insulin. Amyloid was found in the islets of Langerhans of the pancreas in 40 baboons; 35 baboons had amyloid only in the islets of Langerhans. Amyloid was found in nonislet tissue of baboons as follows: five, nonislet pancreas; four, intestine and adrenal; three, kidney; two, prostate and spleen; and one each, lymph node, liver, gall bladder, stomach, tongue, urinary bladder, and salivary gland. Sections of paraffin-embedded tissues were evaluated for amyloid with hematoxylin and eosin (HE) and congo red (CR) staining, and using immunohistochemistry for human islet amyloid polypeptide (IAPP), calcitonin gene-related peptide (CGRP), glucagon, pancreatic polypeptide (PP), somatostatin (SS), and porcine insulin. Islet amyloid was positive with HE in 40 baboons, with CR in 39 baboons, and with IAPP and CGRP in 35 baboons. IAPP and CGRP only stained islet amyloid. PP, SS, glucagon, and porcine insulin did not stain amyloid. Islet amyloidosis in the baboon appears to be difficult to diagnose clinically, age-related, and similar to islet amyloidosis in other species. The baboon may be a good model for the study of islet amyloidosis in humans.
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Affiliation(s)
- G B Hubbard
- Southwest Regional Primate Research Center, San Antonio, TX 78245-0549, USA.
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35
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Abstract
Guinea-pigs and non-human primates have traditionally been used as animal models for studying Ebola Zaire virus (EBO-Z) infections. The virus was also recently adapted to the stage of lethal virulence in BALB/c mice. This murine model is now in use for testing antiviral medications and vaccines. However, the pathological features of EBO-Z infection in mice have not yet been fully described. To identify sites of viral replication and characterize sequential morphological changes in BALB/c mice, adult female mice were infected with mouse-adapted EBO-Z and killed in groups each day for 5 days post-infection. Tissues were examined by light microscopy, immunohistochemistry, electron microscopy and in-situ hybridization. As in guinea-pigs and non-human primates, cells of the mononuclear phagocytic system were the earliest targets of infection. Viral replication was observed by day 2 in macrophages in lymph nodes and spleen. By the time of onset of illness and weight loss (day 3), the infection had spread to hepatocytes and adrenal cortical cells, and to macrophages and fibroblast-like cells in many organs. Severe lymphocytolysis was observed in the spleen, lymph nodes and thymus. There was minimal infection of endothelial cells. All of these changes resembled those observed in EBO-Z-infected guinea-pigs and non-human primates. In contrast to the other animal models, however, there was little fibrin deposition in the late stage of disease. The availability of immunodeficient, "gene-knockout" and transgenic mice will make the mouse model particularly useful for studying the early steps of Ebola pathogenesis.
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Affiliation(s)
- T R Gibb
- Diagnostic Systems, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Fort Detrick, Frederick, Maryland 21702-5011, USA
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Abstract
Magnesium is a key determinant in CaCO3 mineralization; however, macroscopic observations have failed to provide a clear physical understanding of how magnesium modifies carbonate growth. Atomic force microscopy was used to resolve the mechanism of calcite inhibition by magnesium through molecular-scale determination of the thermodynamic and kinetic controls of magnesium on calcite formation. Comparison of directly measured step velocities to standard impurity models demonstrated that enhanced mineral solubility through magnesium incorporation inhibited calcite growth. Terrace width measurements on calcite growth spirals were consistent with a decrease in effective supersaturation due to magnesium incorporation. Ca(1-x)Mg(x)CO3 solubilities determined from microscopic observations of step dynamics can thus be linked to macroscopic measurements.
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Affiliation(s)
- K J Davis
- Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
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Davis KJ, Sloane PD, Mitchell CM, Preisser J, Grant L, Hawes MC, Lindeman D, Montgomery R, Long K, Phillips C, Koch G. Specialized dementia programs in residential care settings. Gerontologist 2000; 40:32-42. [PMID: 10750311 DOI: 10.1093/geront/40.1.32] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/13/2022] Open
Abstract
The authors conducted a telephone survey in 7 states to determine the prevalence of residential care specialized dementia programs (RC-SDPs) and to identify a sample of homes (n = 56) for more detailed study. The 56 homes were site visited, and data were gathered on facility administration, therapeutic environment, and characteristics of 259 randomly selected residents. Comparison data from 138 nursing home Special Care Units (NH-SCUs) and 1,340 of their residents were obtained from 4 studies conducted in the same 7 states. RC-SDPs were smaller, provided a more homelike environment, and had a higher proportion of residents paying privately, compared with NH-SCUs. Mean levels of cognitive and physical impairment among residents were higher in NH-SCUs; prevalences of psychotropic medication use and problem behaviors were similar. Among RC facilities, small homes were more homelike, provided fewer structured activities, and charged less than larger facilities. RC-SDPs include 5 types: small, independently operated homes; multiple small homes with joint administration; larger, all-dementia facilities; SDPs operated within larger, exclusively RC facilities; and RC-SDPs in multilevel facilities.
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Affiliation(s)
- K J Davis
- Data Exploration Center, Glaxo Wellcome, Inc., Research Triangle Park, NC, USA
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Abstract
This issue of CA inaugurates a yearly report on American Cancer Society guidelines for early detection of cancer in asymptomatic individuals. The current recommendations, which reflect almost 20 years of updates, cover screening recommendations for breast, colorectal, prostate, and cervical cancers, as well as for other cancers, depending on patient age, history, environmental and/or occupational exposures, etc. A key concept for both the general public and health providers is the distinction between public health recommendations regarding screening and decisions about early detection tests that might be undertaken on an individual basis. Although it is likely that current screening protocols will be supplanted by newer technologies, such as genetic and molecular markers of risk and disease, greater utilization of the technologies at hand will improve efforts toward establishing an organized and systematic approach to early cancer detection.
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Affiliation(s)
- R A Smith
- American Cancer Society, Atlanta, GA, USA
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Walker SG, Xu X, Altman E, Davis KJ, Ebersole JL, Holt SC. Isolation and chemical analysis of a lipopolysaccharide from the outer membrane of the oral anaerobic spirochete Treponema pectinovorum. Oral Microbiol Immunol 1999; 14:304-8. [PMID: 10551157 DOI: 10.1034/j.1399-302x.1999.140506.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Isolation of a putative lipopolysaccharide from the surface of the oral treponeme, Treponema pectinovorum, revealed it to contain larger amounts of 3-deoxy-D-manno-octulosonic acid compared with other oral Treponema species. This molecule was isolated from the outer membrane of T. pectinovorum and had chemical characteristics of a putative lipopolysaccharide. The yield of lipopolysaccharide was between 0.6% and to 1.1% of the bacterial dry weight. The purified molecule was resistant to the action of proteinases and consisted of both sugars and lipids. 3-Deoxy-D-manno-octulosonic acid and hexoses accounted for 6.1-8.7% and 17.6-20.2%, respectively of the dry weight. Carbohydrate compositional analysis revealed the presence of glucose, galactose, 2-acetamido-2-deoxy-glucose, rhamnose and 6-deoxy-talose in the molar ratio of 1.00:0.96:0.19:0.88:0.98, respectively. No heptose was detected. The fatty acid analysis determined the presence of straight chain, C13:00, C14:00, C15:00 and C17:00 acids, as well as branched chain, C13:00, C14:00 and two species of C15:00, acids. Electrophoretic analysis indicated that the lipopolysaccharide was present as two major species.
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Affiliation(s)
- S G Walker
- Department of Microbiology, University of Texas Health Science Center at San Antonio 78284-7758, USA
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40
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Connolly BM, Steele KE, Davis KJ, Geisbert TW, Kell WM, Jaax NK, Jahrling PB. Pathogenesis of experimental Ebola virus infection in guinea pigs. J Infect Dis 1999; 179 Suppl 1:S203-17. [PMID: 9988186 DOI: 10.1086/514305] [Citation(s) in RCA: 245] [Impact Index Per Article: 9.8] [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: 11/03/2022] Open
Abstract
The subtype Zaire of Ebola (EBO) virus (Mayinga strain) was adapted to produce lethal infections in guinea pigs. In many ways, the disease was similar to EBO infections in nonhuman primates and humans. The guinea pig model was used to investigate the pathologic events in EBO infection that lead to death. Analytical methods included immunohistochemistry, in situ hybridization, and electron microscopy. Cells of the mononuclear phagocyte system, primarily macrophages, were identified as the early and sustained targets of EBO virus. During later stages of infection, interstitial fibroblasts in various tissues were infected, and there was evidence of endothelial cell infection and fibrin deposition. The distribution of lesions, hematologic profiles, and increases in serum biochemical enzymes associated with EBO virus infection in guinea pigs was similar to reported findings in experimentally infected nonhuman primates and naturally infected humans.
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Affiliation(s)
- B M Connolly
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702-5011, USA
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Steele KE, Davis KJ, Stephan K, Kell W, Vogel P, Hart MK. Comparative neurovirulence and tissue tropism of wild-type and attenuated strains of Venezuelan equine encephalitis virus administered by aerosol in C3H/HeN and BALB/c mice. Vet Pathol 1998; 35:386-97. [PMID: 9754544 DOI: 10.1177/030098589803500508] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.5] [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: 11/16/2022]
Abstract
To assess the potential for aerosol administration of vaccines for Venezuelan equine encephalitis virus (VEE), we compared the neurovirulence and tissue tropism of the wild-type Trinidad donkey (TrD) strain to those of the attenuated TC83 and V3526 strains of VEE in mice. Six to 8-week-old female C3H/HeN and BALB/c mice were aerosol exposed to one of the three VEE strains. Three mice of each strain were euthanatized at different times and their tissues were processed and stained using hematoxylin and eosin, immunohistochemistry, and in situ hybridization. All three viral strains infected the brains of mice and induced encephalitis. TrD spread caudally from the olfactory bulbs to all regions of the brain, caused widespread necrotizing panencephalitis by day 5, and resulted in 100% mortality (geometric mean = 7 days) in both mouse strains. By comparison, TC83 relatively spared the caudal regions of the brain but still caused 100% mortality in the C3H/HeN mice (geometric mean = 12 days), yet it did not kill any BALB/c mice. V3526 infectivity of the brain was the most limited, mainly affecting the neocortex and diencephalon. This virus was not lethal in either mouse strain. The TrD strain also infected the olfactory neuroepithelium, local lymphoid tissues, teeth, and vomeronasal organs, whereas the affinity of TC83 and V3526 outside the brain was essentially limited to the olfactory neuroepithelium. Attenuated VEE strains administered to mice by aerosol have restricted tissue tropism as compared with wild-type virus; however, even attenuated strains can infect the brain and induce encephalitis.
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Affiliation(s)
- K E Steele
- Division of Pathology, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702-5000, USA
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Byrne WR, Welkos SL, Pitt ML, Davis KJ, Brueckner RP, Ezzell JW, Nelson GO, Vaccaro JR, Battersby LC, Friedlander AM. Antibiotic treatment of experimental pneumonic plague in mice. Antimicrob Agents Chemother 1998; 42:675-81. [PMID: 9517950 PMCID: PMC105516 DOI: 10.1128/aac.42.3.675] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.7] [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: 08/21/1997] [Accepted: 12/19/1997] [Indexed: 02/06/2023] Open
Abstract
A mouse model was developed to evaluate the efficacy of antibiotic treatment of pneumonic plague; streptomycin was compared to antibiotics with which there is little or no clinical experience. Infection was induced by inhalation of aerosolized Yersinia pestis organisms. Antibiotics were administered by intraperitoneal injection every 6 hours for 5 days, at doses that produced levels of drug in serum comparable to those observed in humans treated for other serious infections. These studies compared in vitro to in vivo activity and evaluated the efficacy of antibiotics started at different times after exposure. Early treatment (started 24 h after challenge, when 0 of 10 mice tested had positive blood cultures) with netilmicin, ciprofloxacin, ofloxacin, ceftriaxone, ceftazidime, aztreonam, ampicillin, and rifampin (but not cefazolin, cefotetan, or ceftizoxime) demonstrated efficacy comparable to streptomycin. Late treatment (started 42 h after exposure, when five of five mice tested had positive blood cultures) with netilmicin, ciprofloxacin, ofloxacin, and a high dose (20 mg/kg of body weight every 6 h) of gentamicin produced survival rates comparable to that with streptomycin, while all of the beta-lactam antibiotics (cefazolin, cefotetan, ceftriaxone, ceftazidime, aztreonam, and ampicillin) and rifampin were significantly inferior to streptomycin. In fact, all groups of mice treated late with beta-lactam antibiotics experienced accelerated mortality rates compared to normal-saline-treated control mice. These studies indicate that netilmicin, gentamicin, ciprofloxacin, and ofloxacin may be alternatives for the treatment of pneumonic plague in humans. However, the beta-lactam antibiotics are not recommended, based upon poor efficacy in this mouse model of pneumonic plague, particularly when pneumonic plague may be associated with bacteremia.
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Affiliation(s)
- W R Byrne
- United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland 21702-5011, USA.
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Abstract
Key findings on cancer incidence and mortality are presented for five racial and ethnic groups in the United States--African Americans, American Indians, Asians and Pacific Islanders, Hispanics, and whites. Information on the prevalence of cancer risk factors and screening examinations among these racial and ethnic groups is also included.
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Affiliation(s)
- S L Parker
- Department of Epidemiology and Surveillance, American Cancer Society, Atlanta, GA, USA
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Abstract
Plasminogen activator is an outer membrane protease of Yersinia pestis encoded by the pla gene on plasmid pPst. Pla of the KIM-10 strain of Y. pestis appears to be required for the virulence from a subcutaneous (sc) but not an intraperitoneal (ip) or intravenous (iv) route of infection in mice. However, other strains of Y. pestis are highly virulent by the sc route yet lack pPst and pla. In this study, the pPst- Pestoides F strain was lethal to mice inoculated sc, with an LD50 (3 cfu), equal to that of C092, a virulent pPst+ strain. To analyse further the role of Pla in invasive infection, isogenic derivatives of C092, including one harboring pla with a frameshift mutation and another cured of pPst, were made. Although the ip LD50 of pPst- C092 and of the pla mutant were nearly identical to that of the wild type, the subcutaneous LD50 of the cured and mutant strains were 4 to 6 logs greater than that of wild type. Thus, pPst appears to be required for development of a lethal infection by some strains after sc inoculation but not after direct ip inoculation. Pla-associated virulence did not appear to be mediated by interference with the phagocyte chemoattractant C5a, as shown by the lack of correlation of C5a production with susceptibility to Y. pestis in C5a+ and C5a- congenic mice. In a footpad model of the early host response to subcutaneous infection, pPst- C092 proliferated at the subcutaneous injection site to a similar extent as did the wild type parent strain, and elicited a similarly large, local inflammatory response. However, the wild type was present at higher concentrations at more distant sites such as the popliteal lymph node and spleen.
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Affiliation(s)
- S L Welkos
- Division of Bacteriology, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, MD 21702-5011, USA
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Vogel P, Fritz DL, Kuehl K, Davis KJ, Geisbert T. The agents of biological warfare. JAMA 1997; 278:438-9. [PMID: 9244340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- P Vogel
- Pathology Division, US Army Military Research Institute for Infectious Disease (USAMRIID), Fort Detrick, MD 21702-5011, USA
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Davis KJ, Vogel P, Fritz DL, Steele KE, Pitt ML, Welkos SL, Friedlander AM, Byrne WR. Bacterial filamentation of Yersinia pestis by beta-lactam antibiotics in experimentally infected mice. Arch Pathol Lab Med 1997; 121:865-8. [PMID: 9278616] [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: 02/05/2023]
Abstract
OBJECTIVE To identify alternatives to streptomycin for treating pneumonic plague, we evaluated beta-lactam antibiotics to treat experimental pneumonic plague in mice. METHODS Mice were exposed to a lethal inhaled dose of Yersinia pestis and treated with beta-lactam antibiotics administered every 6 hours, starting 42 hours postexposure. RESULTS The mice died or were euthanized in extremis 3 days postexposure. We observed marked bacterial filamentation of Y pestis in the tissues of mice treated with ceftazidime (10/10 mice), aztreonam (9/10 mice), or ampicillin (1/10 mice), but not in the tissues of mice treated with cefotetan, cefazolin, ceftriaxone, or saline. There was no evidence of septation of the filamentous bacteria by light or electron microscopy. The filamentous bacteria were confirmed as Y pestis based on their reactivity with rabbit anti-Y pestis F1 serum. CONCLUSIONS Marked bacterial filamentation of Y pestis can be produced in vivo by certain beta-lactam antibiotics. This antibiotic-induced morphologic change is important because filamentous bacteria in clinical samples could possibly be confused with filamentous actinomycotic organisms.
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Affiliation(s)
- K J Davis
- Pathology Division, USAMRIID, Ft Detrick, MD 21702-5011, USA
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Davis KJ, Anderson AO, Geisbert TW, Steele KE, Geisbert JB, Vogel P, Connolly BM, Huggins JW, Jahrling PB, Jaax NK. Pathology of experimental Ebola virus infection in African green monkeys. Involvement of fibroblastic reticular cells. Arch Pathol Lab Med 1997; 121:805-19. [PMID: 9278608] [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: 02/05/2023]
Abstract
BACKGROUND Ebola virus has been responsible for explosive lethal outbreaks of hemorrhagic fever in both humans and nonhuman primates. Previous studies showed a predilection of Ebola virus for cells of the mononuclear phagocyte system and endothelial cells. OBJECTIVE To examine the distribution of lesions and Ebola virus antigen in the tissues of six adult male African green monkeys (Cercopithecus aethiops) that died 6 to 7 days after intraperitoneal inoculation of Ebola-Zaire (Mayinga) virus. METHODS Tissues were examined histologically, immunohistochemically, and ultrastructurally. RESULTS A major novel finding of this study was that fibroblastic reticular cells were immunohistochemically and ultrastructurally identified as targets of Ebola virus infection. CONCLUSIONS The role of Ebola virus-infected fibroblastic reticular cells in the pathogenesis of Ebola hemorrhagic fever warrants further investigation. This is especially important because of recent observations indicating that fibroblastic reticular cells, along with the reticular fibers they produce, maximize the efficiency of the immune response.
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Affiliation(s)
- K J Davis
- Pathology Division, USAMRIID, Ft Detrick, MD 21702-5011, USA
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Abstract
Due to the lack of an animal model, previous studies of sandfly fever have relied upon human challenge trials. We examined the infectivity and potential pathogenicity of sandfly fever virus in cynomolgus monkeys (Macaca fascicularis). Three different preparations of sandfly fever virus. Sicilian strain, and a placebo were compared by different routes of administration. The most notable postchallenge clinical event was a decrease in lymphocytes in the intramuscularly challenged monkeys. Plaque-reduction neutralization responses peaked earlier in animals challenged intravenously as compared with those in animals challenged intramuscularly. There was no evidence for neurotropism or meningeal inflammation. Sandfly fever virus was infectious for cynomolgus monkeys, but produced no detectable clinical disease that might serve as a marker for animal modeling studies. On the other hand, the preclinical data provide supportive evidence for safe parenteral administration of a Sicilian strain of sandfly fever virus inoculum to humans as a challenge model for sandfly fever disease.
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Affiliation(s)
- D J McClain
- Division of Virology, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederich, Maryland, USA
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Jaax NK, Davis KJ, Geisbert TJ, Vogel P, Jaax GP, Topper M, Jahrling PB. Lethal experimental infection of rhesus monkeys with Ebola-Zaire (Mayinga) virus by the oral and conjunctival route of exposure. Arch Pathol Lab Med 1996; 120:140-55. [PMID: 8712894] [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: 02/01/2023]
Abstract
OBJECTIVE The source of infection or mode of transmission of Ebola virus to human index cases of Ebola fever has not been established. Field observations in outbreaks of Ebola fever indicate that secondary transmission of Ebola virus is linked to improper needle hygiene, direct contact with infected tissue or fluid samples, and close contact with infected patients. While it is presumed that the virus infects through either breaks in the skin or contact with mucous membranes, the only two routes of exposure that have been experimentally validated are parenteral inoculation and aerosol inhalation. Epidemiologic evidence suggests that aerosol exposure is not an important means of virus transmission in natural outbreaks of human Ebola fever; this study was designed to verify that Ebola virus could be effectively transmitted by oral or conjunctival exposure in nonhuman primates. MATERIALS AND METHODS Adult rhesus monkeys (Macaca mulatta) were exposed to Ebola-Zaire (Mayinga) virus orally (N=4), conjunctivally (N=4), or by intramuscular inoculation (N=1, virus-positive control). RESULTS Four of four monkeys exposed by the conjunctival route, three of four monkeys exposed by the oral route, and the intramuscularly inoculated positive control monkey (one of one) were successfully infected with Ebola-Zaire (Mayinga). Seven monkeys died of Ebola fever between days 7 and 8 postexposure. One monkey was given aggressive supportive therapy and a platelet transfusion; it lived until day 12 postexposure. CONCLUSIONS Findings in this study experimentally confirm that Ebola virus can be effectively transmitted via the oral or conjunctival route of exposure in nonhuman primates.
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Affiliation(s)
- N K Jaax
- Pathology Division, Unites States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702-5011, USA
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Davis KJ, Fritz DL, Pitt ML, Welkos SL, Worsham PL, Friedlander AM. Pathology of experimental pneumonic plague produced by fraction 1-positive and fraction 1-negative Yersinia pestis in African green monkeys (Cercopithecus aethiops). Arch Pathol Lab Med 1996; 120:156-63. [PMID: 8712895] [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: 02/01/2023]
Abstract
OBJECTIVE The protein capsule of Yersinia pestis, known as Fraction 1 or F1, is a protective immunogen and is an assumed, but not proven, virulence factor. Our objectives were to determine if inhaled F1-negative and/or F1-positive strains of Y pestis were virulent in the African green monkey and, if so, to differentiate F1-negative from F1-positive monkeys. Because F1-negative strains have been isolated from natural sources and have caused experimental fatal disease, we felt that this information was crucial to the development of future vaccines and diagnostic tests. MATERIALS AND METHODS Adult African green monkeys were exposed by aerosol to F1-positive (CO92, n=15) or F1-negative (CO92-C12, n=6; Java-9, n=2) Y pestis strains. RESULTS All monkeys died 4 to 10 days postexposure and had lesions consistent with primary pneumonic plague. Antibodies to F1 antigen and other Y pestis antigens allowed us to differentiate F1-positive from F1-negative Y pestis strains in fixed tissues. CONCLUSIONS In this study, F1 antigen was not a required virulence factor. Therefore, there may be a need for vaccines and diagnostic assays that are not solely based on the F1 antigen.
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Affiliation(s)
- K J Davis
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick Md 21702-5011, USA
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