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Krause AJ, Greytak M, Kaizer AM, Carlson DA, Chan WW, Chen CL, Gyawali CP, Jenkins A, Pandolfino JE, Polamraju V, Wong MW, Yadlapati R. Diagnostic Yield of Ambulatory Reflux Monitoring Systems for Evaluation of Chronic Laryngeal Symptoms. Am J Gastroenterol 2024; 119:627-634. [PMID: 37830520 PMCID: PMC10994771 DOI: 10.14309/ajg.0000000000002557] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 10/03/2023] [Indexed: 10/14/2023]
Abstract
INTRODUCTION Among patients with chronic laryngeal symptoms, ambulatory reflux monitoring off acid suppression is recommended to evaluate for laryngopharyngeal reflux (LPR). However, reflux monitoring systems are diverse in configuration and monitoring capabilities, which present a challenge in creating a diagnostic reference standard in these patients. This study aimed to compare diagnostic yield and performance between reflux monitoring systems in patients with chronic laryngeal symptoms. METHODS This multicenter, international study of adult patients referred for evaluation of LPR over a 5-year period (March 2018-May 2023) assessed and compared diagnostic yield of pathologic gastroesophageal reflux (GER+) on ambulatory reflux monitoring off acid suppression. RESULTS Of 813 patients, 296 (36%) underwent prolonged wireless pH, 532 (65%) underwent 24-hour pH-impedance monitoring, and 15 (2%) underwent both tests. Overall diagnostic yield for GER+ was 36% and greater for prolonged wireless pH compared with that for 24-hour pH-impedance monitoring (50% vs 27%; P < 0.01). Among 15 patients who underwent both prolonged wireless pH and 24-h pH-impedance monitoring, concordance between systems for GER+ was 40%. The most common source of discordance was strong evidence of GER+ across multiple days on prolonged wireless pH compared with no evidence of GER+ on pH-impedance. DISCUSSION In this multicenter international study of patients with chronic laryngeal symptoms referred for LPR evaluation, diagnostic yield of ambulatory reflux monitoring off acid suppression was 36% and rose to 50% when using wireless pH monitoring. In patients referred for chronic laryngeal symptoms, 24-hour pH-impedance monitoring may risk a low negative predictive value in patients with unproven GER+ disease.
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Affiliation(s)
- Amanda J Krause
- Department of Medicine, Division of Gastroenterology and Hepatology, University of California San Diego, La Jolla, California, USA
| | - Madeline Greytak
- Department of Medicine, Division of Gastroenterology and Hepatology, University of California San Diego, La Jolla, California, USA
| | - Alexander M Kaizer
- Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Dustin A Carlson
- Department of Medicine, Division of Gastroenterology and Hepatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Walter W Chan
- Department of Medicine, Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Boston, Massachusetts, USA
- Harvard Medical School, Boston, Massachusetts, USA
| | - Chien-Lin Chen
- Department of Medicine, Division of Gastroenterology and Hepatology, Tzu Chi University, Hualien County, Taiwan
| | - C Prakash Gyawali
- Department of Medicine, Division of Gastroenterology, Washington University, St. Louis, Missouri, USA
| | - Andrew Jenkins
- Department of Medicine, Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Boston, Massachusetts, USA
- Harvard Medical School, Boston, Massachusetts, USA
| | - John E Pandolfino
- Department of Medicine, Division of Gastroenterology and Hepatology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Vinathi Polamraju
- Department of Medicine, Division of Gastroenterology, Washington University, St. Louis, Missouri, USA
| | - Ming-Wun Wong
- Department of Medicine, Division of Gastroenterology and Hepatology, Tzu Chi University, Hualien County, Taiwan
| | - Rena Yadlapati
- Department of Medicine, Division of Gastroenterology and Hepatology, University of California San Diego, La Jolla, California, USA
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Krause AJ, Kaizer AM, Carlson DA, Chan WW, Chen CL, Gyawali CP, Jenkins A, Pandolfino JE, Polamraju V, Wong MW, Greytak M, Yadlapati R. Validated Clinical Score to Predict Gastroesophageal Reflux in Patients With Chronic Laryngeal Symptoms: COuGH RefluX. Clin Gastroenterol Hepatol 2024:S1542-3565(24)00098-3. [PMID: 38309491 DOI: 10.1016/j.cgh.2024.01.021] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 01/04/2024] [Accepted: 01/16/2024] [Indexed: 02/05/2024]
Abstract
BACKGROUND & AIMS Discerning whether laryngeal symptoms result from gastroesophageal reflux is clinically challenging and a reliable tool to stratify patients is needed. We aimed to develop and validate a model to predict the likelihood of gastroesophageal reflux disease (GERD) among patients with chronic laryngeal symptoms. METHODS This multicenter international study collected data from adults with chronic laryngeal symptoms who underwent objective testing (upper gastrointestinal endoscopy and/or ambulatory reflux monitoring) between March 2018 and May 2023. The training phase identified a model with optimal receiver operating characteristic curves, and β coefficients informed a weighted model. The validation phase assessed performance characteristics of the weighted model. RESULTS A total of 856 adults, 304 in the training cohort and 552 in the validation cohort, were included. In the training phase, the optimal predictive model (area under the curve, 0.68; 95% CI, 0.62-0.74), was the Cough, Overweight/obesity, Globus, Hiatal Hernia, Regurgitation, and male seX (COuGH RefluX) score, with a lower threshold of 2.5 and an upper threshold of 5.0 to predict proven GERD. In the validation phase, the COuGH RefluX score had an area under the curve of 0.67 (95% CI, 0.62-0.71), with 79% sensitivity and 81% specificity for proven GERD. CONCLUSIONS The externally validated COuGH RefluX score is a clinically practical model to predict the likelihood of proven GERD. The score classifies most patients with chronic laryngeal symptoms as low/high likelihood of proven GERD, with only 38% remaining as indeterminate. Thus, the COuGH RefluX score can guide diagnostic strategies and reduce inappropriate proton pump inhibitor use or testing for patients referred for evaluation of chronic laryngeal symptoms.
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Affiliation(s)
- Amanda J Krause
- Division of Gastroenterology and Hepatology, Department of Medicine, University of California San Diego, La Jolla, California
| | - Alexander M Kaizer
- Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado-Anschutz Medical Campus, Aurora, Colorado
| | - Dustin A Carlson
- Division of Gastroenterology and Hepatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Walter W Chan
- Division of Gastroenterology, Hepatology and Endoscopy, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts
| | - Chien-Lin Chen
- Division of Gastroenterology and Hepatology, Department of Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation and Tzu Chi University, Hualien, Taiwan
| | - C Prakash Gyawali
- Division of Gastroenterology, Department of Medicine, Washington University, St. Louis, Missouri
| | - Andrew Jenkins
- Division of Gastroenterology, Hepatology and Endoscopy, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts
| | - John E Pandolfino
- Division of Gastroenterology and Hepatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Vinathi Polamraju
- Division of Gastroenterology, Department of Medicine, Washington University, St. Louis, Missouri
| | - Ming-Wun Wong
- Division of Gastroenterology and Hepatology, Department of Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation and Tzu Chi University, Hualien, Taiwan
| | - Madeline Greytak
- Division of Gastroenterology and Hepatology, Department of Medicine, University of California San Diego, La Jolla, California
| | - Rena Yadlapati
- Division of Gastroenterology and Hepatology, Department of Medicine, University of California San Diego, La Jolla, California.
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Nguyen AH, Tran TT, Panesso D, Hood K, Polamraju V, Zhang R, Khan A, Miller WR, Mileykovskaya E, Shamoo Y, Xu L, Vitrac H, Arias CA. Molecular Basis of Cell Membrane Adaptation in Daptomycin-Resistant Enterococcus faecalis. bioRxiv 2023:2023.08.02.551704. [PMID: 37577577 PMCID: PMC10418189 DOI: 10.1101/2023.08.02.551704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Daptomycin is a last-resort lipopeptide antibiotic that disrupts cell membrane (CM) and peptidoglycan homeostasis. Enterococcus faecalis has developed a sophisticated mechanism to avoid daptomycin killing by re-distributing CM anionic phospholipids away from the septum. The CM changes are orchestrated by a three-component regulatory system, designated LiaFSR, with a possible contribution of cardiolipin synthase (Cls). However, the mechanism by which LiaFSR controls the CM response and the role of Cls are unknown. Here, we show that cardiolipin synthase activity is essential for anionic phospholipid redistribution and daptomycin resistance since deletion of the two genes ( cls1 and cls2 ) encoding Cls abolished CM remodeling. We identified LiaY, a transmembrane protein regulated by LiaFSR, as an important mediator of CM remodeling required for re-distribution of anionic phospholipid microdomains via interactions with Cls1. Together, our insights provide a mechanistic framework on the enterococcal response to cell envelope antibiotics that could be exploited therapeutically.
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Nguyen A, Polamraju V, Zhang R, Panesso D, Khan A, Mileykovskaya E, Cecilia Tran T, Xu L, Vitrac H, Arias CA. 140. Enterococcus faecalis CL Synthases Have Redundant Roles and Play A Major Role in Phospholipid Redistribution Associated with Daptomycin Resistance. Open Forum Infect Dis 2022. [PMCID: PMC9751826 DOI: 10.1093/ofid/ofac492.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Background Daptomycin (DAP) is a lipopeptide antibiotic targeting membrane anionic phospholipids (APLs) at the division septum. DAP resistance (DAP-R) has been associated with activation of the LiaFSR system resulting in redistribution of APL microdomains (likely containing cardiolipin, CL) away from the septum. E. faecalis (Efs) possess two CL synthase genes, (cls1 and cls2) and changes in Cls1 are associated with DAP-R. However, the roles of each enzyme are unknown. Here, we characterize the roles of cls genes in DAP-R in the context of LiaFSR activation. Methods cls1 and/or cls2 were deleted from Efs OG117 and OG117ΔliaX (DAP-R strain with an activated LiaFSR response). qRT-PCR was used to study gene expression of cls1 and cls2 in the cls mutants. Membrane lipid content was analyzed using hydrophilic interaction chromatography-mass spectrometry. Mutants were characterized by DAP minimum inhibitory concentration (MIC) using E-test and localization of APL microdomains with 10-N-nonyl-acridine orange. Results cls1 and cls2 are upregulated in exponential phase of DAP-R Efs OG117ΔliaX relative to DAP-S Efs OG117, with only cls1 upregulated in stationary phase. Deletion of cls1 or cls2 resulted in upregulation of the other cls gene, independent of activation of LiaFSR. Lipidomics analysis confirmed that deletion of both cls resulted in complete absence of cell membrane CL content. When comparing CL profiles of Δcls1 relative to Δcls2 in both DAP-S and DAP-R, both strains produced similar levels and species of CL. However, development of DAP-R caused a change in membrane lipid content, namely, an increase in CL with no significant difference in phosphatidylglycerol compared to DAP-S strain. Evaluation of CL species in DAP-R shows a shift towards species containing longer fatty acid chains and higher saturation. Independent deletions of cls1 or cls2 did not revert the DAP phenotype. In contrast, deletion of both cls genes decreased the DAP MIC (2-3 fold) relative to the parent strain and restored septal localization of APL microdomains. DAP MIC was restored upon trans complementation of either cls1 or cls2 into the double deletion mutant. Conclusion Our results support a major role of Cls in changes in cell membrane architecture and DAP-R in enterococci, with overlapping roles for Cls1 and Cls2. Disclosures Cesar A. Arias, MD, PhD, Entasis Phramceuticals: Grant/Research Support|MeMed Diagnostics: Grant/Research Support|Merck: Grant/Research Support.
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Affiliation(s)
- April Nguyen
- University of Texas Health Science Center at Houston, Houston, Texas
| | - Vinathi Polamraju
- University of Texas Health Science Center at Houston, Houston, Texas
| | - Rutan Zhang
- University of Washington, Seattle, Washington
| | | | - Ayesha Khan
- Clinica Alemana, santiago de chile, Region Metropolitana, Chile
| | | | | | - Libin Xu
- University of Washington, Seattle, Washington
| | - Heidi Vitrac
- MOBILion Systems, Inc., Chadds Ford, Pennsylvania
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Nguyen A, Polamraju V, Zhang R, Tran TT, Panesso D, Khan A, Mileykovskaya E, Shamoo Y, Xu L, Vitrac H, Arias CA. 1275. Dynamics of Enterococcus faecalis Cardiolipin Synthase Gene Expression Reveal Compensatory Roles in Daptomycin Resistance. Open Forum Infect Dis 2021. [PMCID: PMC8644016 DOI: 10.1093/ofid/ofab466.1467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Background Daptomycin (DAP) is a lipopeptide antibiotic targeting membrane anionic phospholipids (APLs) at the division septum, and resistance (DAP-R) has been associated with activation of the E. faecalis (Efs) LiaFSR response and redistribution of APL microdomains (predicted to contain cardiolipin) away from the septum. Efs encodes two putative cardiolipin synthase genes, cls1 and cls2. While changes in Cls1 are associated with DAP-R, the exact roles of each enzyme in resistance are unknown. This work aims to establish the contributions for both enzymes in the development of DAP-R. Methods cls1 and cls2 were deleted individually and in tandem from Efs OG117∆liaX (a DAP-R strain with an activated LiaFSR response). Mutants were characterized by DAP minimum inhibitory concentration (MIC) using E-test and localization of APL microdomains with 10-N-nonyl-acridine orange staining. Quantitative PCR (qRT-PCR) was used to study gene expression profiles of cls1 and cls2 in Efs OG117∆liaX relative to Efs OG117. Membrane lipid content was analyzed using hydrophilic interaction chromatography-mass spectrometry (HILIC-MS). Results cls1 was highly upregulated in stationary phase concurrent with a decrease in cls2 expression. However, independent deletion of cls1 or cls2 in the DAP-R background resulted in no significant phenotypic changes from the parent strain. Interestingly, qRT-PCR showed that cls2 expression was upregulated upon deletion of cls1 (and vice-versa), suggesting a compensatory role for one enzyme upon deletion of the other (Fig 1). When comparing membrane lipid content between Efs OG117∆liaX∆cls1 and Efs OG117∆liaX∆cls2, there were no significant differences in both the overall amount or species of cardiolipin generated, further supporting a potential redundancy between the cardiolipin synthases (Fig 2). Ultimately, double deletion of both cls genes lowered the DAP MIC relative to the parent strain and restored septal localization of APL microdomains. ![]()
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Conclusion Overall, Cls1 has a predominant role in the development of DAP-R in E. faecalis. However, here, we describe a novel compensatory role for Cls2 under conditions in which there is no functional Cls1 to maintain the DAP-R phenotype. Disclosures Truc T. Tran, PharmD, Merck (Grant/Research Support) Cesar A. Arias, M.D., MSc, Ph.D., FIDSA, Entasis Therapeutics (Grant/Research Support)MeMed Diagnostics (Grant/Research Support)Merk (Grant/Research Support)
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Affiliation(s)
- April Nguyen
- University of Texas Health Science Center at Houston, Houston, Texas
| | | | - Rutan Zhang
- University of Washington, Seattle, Washington
| | - Truc T Tran
- Center for Antimicrobial Resistance and Microbial Genomics, UTHealth, Houston, TX, Houston, TX
| | | | | | | | | | - Libin Xu
- University of Washington, Seattle, Washington
| | | | - Cesar A Arias
- CARMiG, UTHealth and Center for Infectious Diseases, UTHealth School of Public Health, HOU, TX ; Molecular Genetics and Antimicrobial Resistance Unit and International Center for Microbial Genomics, Universidad El Bosque, BOG, COL, Houston, Texas
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Nguyen A, Polamraju V, Tran TT, Panesso-Botero D, Khan A, Mileykovskaya E, Vitrac H, Arias CA. 1446. Dynamics of Enterococcus faecalis Cardiolipin Synthase Gene Expression Reveal Compensatory Roles in Daptomycin Resistance. Open Forum Infect Dis 2020. [PMCID: PMC7776985 DOI: 10.1093/ofid/ofaa439.1627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Daptomycin (DAP) is a lipopeptide antibiotic targeting membrane anionic phospholipids (APLs) at the division septum, and resistance (DAP-R) has been linked to mutations in genes encoding i) the LiaFSR stress response system or its effector LiaX, and ii) cardiolipin synthase (Cls). Activation of the E. faecalis (Efs) LiaFSR response is associated with DAP-R and redistribution of APL microdomains away from the septum, and cardiolipin is predicted to be a major component of these APL microdomains. Efs harbors two putative cls genes, cls1 and cls2. While changes in Cls1 have been implicated in DAP-R, the exact roles of each enzyme in resistance are unknown. We aim to characterize the contributions of Cls1 and Cls2 in the development of DAP-R. Methods cls1 and cls2 were deleted individually and in tandem from DAP-S Efs OG117 and DAP-R Efs OG117∆liaX (a DAP-R derivative strain with an activated LiaFSR response). Mutants were characterized by DAP minimum inhibitory concentration (MIC) using E-test on Mueller-Hinton II agar and localization of APL microdomains with 10-N-nonyl-acridine orange staining. Quantitative PCR (qRT-PCR) was used to study gene expression profiles of cls1 and cls2 in Efs OG117∆liaX relative to Efs OG117 across the cell growth cycle. Results qRT-PCR revealed differential expression profiles of cls1 and cls2 associated with DAP-R. cls1 was highly upregulated in stationary phase concurrent with a decrease in cls2 expression. However, independent deletion of cls1 or cls2 in the DAP-R background resulted in no significant changes in DAP MICs or localization of APL microdomains (remaining non-septal). Further studies revealed that cls2 expression is upregulated upon deletion of cls1 in both the DAP-S and DAP-R background, suggesting a potential compensatory role for Cls2. Double deletion of both cls genes in the DAP-R strain decreased DAP MIC and restored the septal localization of APL microdomains. Conclusion Cls1 is the major and predominant enzyme involved in cell membrane adaptation associated with the development of DAP-R in E. faecalis. However, we describe a novel compensatory and overlapping role for cardiolipin synthases to ensure bacterial survival upon attack from antimicrobial peptides and related antibiotics. Disclosures Cesar A. Arias, MD, MSc, PhD, FIDSA, Entasis Therapeutics (Scientific Research Study Investigator)MeMed (Scientific Research Study Investigator)Merck (Grant/Research Support)
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Affiliation(s)
- April Nguyen
- Center for Antimicrobial Resistance and Microbial Genomics, UTHealth, Houston, TX,, Houston, TX
| | | | - Truc T Tran
- Center for Antimicrobial Resistance and Microbial Genomics, UTHealth, Houston, TX,, Houston, TX
| | | | | | | | | | - Cesar A Arias
- CARMiG, UTHealth and Center for Infectious Diseases, UTHealth School of Public Health, HOU, TX; Molecular Genetics and Antimicrobial Resistance Unit and International Center for Microbial Genomics, Universidad El Bosque, BOG, COL, Houston, Texas
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