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Topletz-Erickson AR, Lee A, Kumar V, Ubowski M, Mayor JG, Abdulrasool LI, Henderson CM, Ware JA, Endres CJ. Abstract 5060: Tucatinib does not alter oxaliplatin PK or associated renal function: An OCT2 and MATE transport inhibition study. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-5060] [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: 04/07/2023]
Abstract
Abstract
Background: Oxaliplatin (OX)-containing regimens are frequently utilized to treat gastrointestinal (GI) cancers. OX is eliminated predominately via urinary excretion (GFR and active tubular secretion). The contribution of active transport via OCT2 and MATE1/2-K to OX clearance is not fully understood. Tyrosine kinase inhibitors (TKIs) are frequently found to interact with OCT2/MATE transporters; however, a gap in knowledge remains between their clinical potential to impact OX pharmacokinetics (PK) and in turn, impact renal function. Tucatinib (TUC) is a highly selective human epidermal growth factor receptor 2 (HER2)-directed TKI approved in multiple regions in combination with trastuzumab and capecitabine for adult patients with metastatic HER2+ breast cancer and is currently being investigated in other HER2+ tumors. TUC inhibits OCT2/MATE-mediated transport of metformin and creatinine in vitro and in vivo. In this study, we investigated the impact of TUC on OX plasma PK, OX renal clearance (Clr), and renal function.
Methods: In vitro inhibition of OCT2/MATE-mediated transport of OX by TUC was assessed in OCT2, MATE1, or MATE2-K-expressing MDCK-II cells. SGNTUC-024 (NCT04430738) is a Ph1b/2 clinical study in patients with HER2+ GI cancers evaluating the impact of TUC on the safety and PK of OX. Patients received TUC 150 mg (Cohort 1A) or 300 mg (Cohort 1B) BID starting on C1D8 of a 2-week cycle in combination with modified FOLFOX6/7. Intensive PK was collected in plasma and urine for OX alone (C1D1) or with steady-state TUC (C2D1). Total plasma platinum (Pt, analyzed as a surrogate for OX and catabolites), plasma Pt ultrafiltrate (PUF, unbound), and urine Pt were quantitatively analyzed via ICP-MS. Serum Cystatin C (CysC) was measured as a pharmacodynamic (PD) renal function marker in Cohorts 1A and 1B.
Results: TUC inhibited in vitro OX transport by MATE1 (IC50 = 0.0639 µM), MATE2-K (IC50 = 0.0382 µM), and OCT2 (IC50 = 0.491 µM). In 11 patients, total Pt and PUF AUC0-8h geometric mean ratio (GMR) and 90% confidence intervals (CI) between patients who received OX alone compared to in combination were 1.1 (0.98, 1.3) and 1.0 (0.78, 1.4) in Cohort 1A (n=4) and 1.1 (0.96, 1.2) and 1.0 (0.98, 1.1) in Cohort 1B (n=7), respectively. OX GM (%CV) renal clearance (Clr,0-8h in mL/min) and fraction excreted 24h post-dose (fe,0-24h) were similar with and without TUC in both Cohort 1A (C1D1 Clr0-8h = 277 (33), fe,0-24h = 22% (17); C2D1 Clr0-8h = 249 (78), fe,0-24h = 21% (15)) and Cohort 1B (C1D1 Clr0-8h = 189 (37), fe,0-24h = 17.7% (16); C2D1 Clr0-8h = 177 (40), fe,0-24h = 16.6% (35)). Reversible slight increases in CysC (normalized to baseline) on day 3 of each cycle, irrespective of tucatinib, were observed.
Conclusions: This investigation of in vitro and in vivo determinants of OX PK demonstrates that TUC does not alter the renal clearance of oxaliplatin nor renal function when OX is administered in combination with TUC.
Citation Format: Ariel R. Topletz-Erickson, Anthony Lee, Vineet Kumar, Michelle Ubowski, JoAl G. Mayor, Layth I. Abdulrasool, Clark M. Henderson, Joseph A. Ware, Christopher J. Endres. Tucatinib does not alter oxaliplatin PK or associated renal function: An OCT2 and MATE transport inhibition study. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 5060.
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Kilpatrick LE, Bouillon R, Davis WC, Henderson CM, Hoofnagle AN, Pauwels S, Vanderschueren D, Waelkens E, Wildiers H, Yen JH, Phinney KW. The influence of proteoforms: assessing the accuracy of total vitamin D-binding protein quantification by proteolysis and LC-MS/MS. Clin Chem Lab Med 2023; 61:78-85. [PMID: 36279170 DOI: 10.1515/cclm-2022-0642] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 09/26/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVES Vitamin D-binding protein (VDBP), a serum transport protein for 25-hydroxyvitamin D [25(OH)D], has three common proteoforms which have co-localized amino acid variations and glycosylation. A monoclonal immunoassay was found to differentially detect VDBP proteoforms and methods using liquid chromatography-tandem mass spectrometry (LC-MS/MS) might be able to overcome this limitation. Previously developed multiple reaction monitoring LC-MS/MS methods for total VDBP quantification represent an opportunity to probe the potential effects of proteoforms on proteolysis, instrument response and quantification accuracy. METHODS VDBP was purified from homozygous human donors and quantified using proteolysis or acid hydrolysis and LC-MS/MS. An interlaboratory comparison was performed using pooled human plasma [Standard Reference Material® 1950 (SRM 1950) Metabolites in Frozen Human Plasma] and analyses with different LC-MS/MS methods in two laboratories. RESULTS Several shared peptides from purified proteoforms were found to give reproducible concentrations [≤2.7% coefficient of variation (CV)] and linear instrument responses (R2≥0.9971) when added to human serum. Total VDBP concentrations from proteolysis or amino acid analysis (AAA) of purified proteoforms had ≤1.92% CV. SRM 1950, containing multiple proteoforms, quantified in two laboratories resulted in total VDBP concentrations with 7.05% CV. CONCLUSIONS VDBP proteoforms were not found to cause bias during quantification by LC-MS/MS, thus demonstrating that a family of proteins can be accurately quantified using shared peptides. A reference value was assigned for total VDBP in SRM 1950, which may be used to standardize methods and improve the accuracy of VDBP quantification in research and clinical samples.
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Affiliation(s)
- Lisa E Kilpatrick
- Material Measurement Laboratory, Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Roger Bouillon
- Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium
| | - W Clay Davis
- Hollings Marine Laboratory, National Institute of Standards and Technology, Charleston, SC, USA
| | - Clark M Henderson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA.,Seagen, Inc., Bothell, WA, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Steven Pauwels
- Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Dirk Vanderschueren
- Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Etienne Waelkens
- Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Hans Wildiers
- Department of General Medical Oncology, University Hospitals Leuven, Leuven, Belgium
| | - James H Yen
- Statistical Engineering Division, Information Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Karen W Phinney
- Material Measurement Laboratory, Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
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Andrews M, Yoshida T, Henderson CM, Pflaum H, McGregor A, Lieberman JA, de Boer IH, Vaisar T, Himmelfarb J, Kestenbaum B, Chung JY, Hewitt SM, Santo BA, Ginley B, Sarder P, Rosenberg AZ, Murakami T, Kopp JB, Kuklenyik Z, Hoofnagle AN. Variant APOL1 protein in plasma associates with larger particles in humans and mouse models of kidney injury. PLoS One 2022; 17:e0276649. [PMID: 36279295 PMCID: PMC9591058 DOI: 10.1371/journal.pone.0276649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 10/11/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Genetic variants in apolipoprotein L1 (APOL1), a protein that protects humans from infection with African trypanosomes, explain a substantial proportion of the excess risk of chronic kidney disease affecting individuals with sub-Saharan ancestry. The mechanisms by which risk variants damage kidney cells remain incompletely understood. In preclinical models, APOL1 expressed in podocytes can lead to significant kidney injury. In humans, studies in kidney transplant suggest that the effects of APOL1 variants are predominantly driven by donor genotype. Less attention has been paid to a possible role for circulating APOL1 in kidney injury. METHODS Using liquid chromatography-tandem mass spectrometry, the concentrations of APOL1 were measured in plasma and urine from participants in the Seattle Kidney Study. Asymmetric flow field-flow fractionation was used to evaluate the size of APOL1-containing lipoprotein particles in plasma. Transgenic mice that express wild-type or risk variant APOL1 from an albumin promoter were treated to cause kidney injury and evaluated for renal disease and pathology. RESULTS In human participants, urine concentrations of APOL1 were correlated with plasma concentrations and reduced kidney function. Risk variant APOL1 was enriched in larger particles. In mice, circulating risk variant APOL1-G1 promoted kidney damage and reduced podocyte density without renal expression of APOL1. CONCLUSIONS These results suggest that plasma APOL1 is dynamic and contributes to the progression of kidney disease in humans, which may have implications for treatment of APOL1-associated kidney disease and for kidney transplantation.
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Affiliation(s)
- Michael Andrews
- Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Teruhiko Yoshida
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Clark M. Henderson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Hannah Pflaum
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Ayako McGregor
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Joshua A. Lieberman
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
| | - Ian H. de Boer
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Tomas Vaisar
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Jonathan Himmelfarb
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Bryan Kestenbaum
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
| | - Joon-Yong Chung
- Center for Cancer Research, NCI, NIH, Bethesda, Maryland, United States of America
| | - Stephen M. Hewitt
- Center for Cancer Research, NCI, NIH, Bethesda, Maryland, United States of America
| | - Briana A. Santo
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Brandon Ginley
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Pinaki Sarder
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine & Biomedical Sciences, University at Buffalo, Buffalo, New York, United States of America
| | - Avi Z. Rosenberg
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, Maryland, United States of America
| | - Taichi Murakami
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
- Department of Nephrology, Ehime Prefectural Central Hospital, Ehime, Japan
| | - Jeffrey B. Kopp
- Kidney Disease Section, Kidney Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Zsuzsanna Kuklenyik
- Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Andrew N. Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Kidney Research Institute, University of Washington, Seattle, Washington, United States of America
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Limonte CP, Valo E, Drel V, Natarajan L, Darshi M, Forsblom C, Henderson CM, Hoofnagle AN, Ju W, Kretzler M, Montemayor D, Nair V, Nelson RG, O’Toole JF, Toto RD, Rosas SE, Ruzinski J, Sandholm N, Schmidt IM, Vaisar T, Waikar SS, Zhang J, Rossing P, Ahluwalia TS, Groop PH, Pennathur S, Snell-Bergeon JK, Costacou T, Orchard TJ, Sharma K, de Boer IH. Urinary Proteomics Identifies Cathepsin D as a Biomarker of Rapid eGFR Decline in Type 1 Diabetes. Diabetes Care 2022; 45:1416-1427. [PMID: 35377940 PMCID: PMC9210873 DOI: 10.2337/dc21-2204] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 03/04/2022] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Understanding mechanisms underlying rapid estimated glomerular filtration rate (eGFR) decline is important to predict and treat kidney disease in type 1 diabetes (T1D). RESEARCH DESIGN AND METHODS We performed a case-control study nested within four T1D cohorts to identify urinary proteins associated with rapid eGFR decline. Case and control subjects were categorized based on eGFR decline ≥3 and <1 mL/min/1.73 m2/year, respectively. We used targeted liquid chromatography-tandem mass spectrometry to measure 38 peptides from 20 proteins implicated in diabetic kidney disease. Significant proteins were investigated in complementary human cohorts and in mouse proximal tubular epithelial cell cultures. RESULTS The cohort study included 1,270 participants followed a median 8 years. In the discovery set, only cathepsin D peptide and protein were significant on full adjustment for clinical and laboratory variables. In the validation set, associations of cathepsin D with eGFR decline were replicated in minimally adjusted models but lost significance with adjustment for albuminuria. In a meta-analysis with combination of discovery and validation sets, the odds ratio for the association of cathepsin D with rapid eGFR decline was 1.29 per SD (95% CI 1.07-1.55). In complementary human cohorts, urine cathepsin D was associated with tubulointerstitial injury and tubulointerstitial cathepsin D expression was associated with increased cortical interstitial fractional volume. In mouse proximal tubular epithelial cell cultures, advanced glycation end product-BSA increased cathepsin D activity and inflammatory and tubular injury markers, which were further increased with cathepsin D siRNA. CONCLUSIONS Urine cathepsin D is associated with rapid eGFR decline in T1D and reflects kidney tubulointerstitial injury.
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Affiliation(s)
- Christine P. Limonte
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA
- Kidney Research Institute, University of Washington, Seattle, WA
| | - Erkka Valo
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Viktor Drel
- Division of Nephrology, The University of Texas Health Science Center at San Antonio, San Antonio, TX
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Loki Natarajan
- Division of Biostatistics and Bioinformatics, Department of Family Medicine and Public Health and Moores Cancer Center at UC San Diego Health, La Jolla, CA
| | - Manjula Darshi
- Division of Nephrology, The University of Texas Health Science Center at San Antonio, San Antonio, TX
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Carol Forsblom
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Clark M. Henderson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Andrew N. Hoofnagle
- Kidney Research Institute, University of Washington, Seattle, WA
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
- Division of Metabolism, Endocrinology, and Nutrition, UW Medicine Diabetes Institute, University of Washington, Seattle, WA
| | - Wenjun Ju
- Division of Nephrology, University of Michigan, Ann Arbor, MI
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI
| | - Matthias Kretzler
- Division of Nephrology, University of Michigan, Ann Arbor, MI
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI
| | - Daniel Montemayor
- Division of Nephrology, The University of Texas Health Science Center at San Antonio, San Antonio, TX
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Viji Nair
- Division of Nephrology, University of Michigan, Ann Arbor, MI
| | - Robert G. Nelson
- Chronic Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ
| | - John F. O’Toole
- Department of Nephrology and Hypertension, Cleveland Clinic, Cleveland, OH
| | - Robert D. Toto
- Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX
| | | | - John Ruzinski
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA
- Kidney Research Institute, University of Washington, Seattle, WA
| | - Niina Sandholm
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Insa M. Schmidt
- Section of Nephrology, Department of Medicine, Boston University School of Medicine and Boston Medical Center, Boston, MA
| | - Tomas Vaisar
- Division of Metabolism, Endocrinology, and Nutrition, UW Medicine Diabetes Institute, University of Washington, Seattle, WA
| | - Sushrut S. Waikar
- Section of Nephrology, Department of Medicine, Boston University School of Medicine and Boston Medical Center, Boston, MA
| | - Jing Zhang
- Division of Biostatistics and Bioinformatics, Department of Family Medicine and Public Health and Moores Cancer Center at UC San Diego Health, La Jolla, CA
| | - Peter Rossing
- Steno Diabetes Center Copenhagen, Gentofte, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Tarunveer S. Ahluwalia
- Steno Diabetes Center Copenhagen, Gentofte, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- The Bioinformatics Center, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Per-Henrik Groop
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Subramaniam Pennathur
- Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI
| | - Janet K. Snell-Bergeon
- Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO
| | | | | | - Kumar Sharma
- Division of Nephrology, The University of Texas Health Science Center at San Antonio, San Antonio, TX
- Center for Renal Precision Medicine, Division of Nephrology, Department of Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Ian H. de Boer
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA
- Kidney Research Institute, University of Washington, Seattle, WA
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Phipps WS, Smith KD, Yang HY, Henderson CM, Pflaum H, Lerch ML, Fondrie WE, Emrick MA, Wu CC, MacCoss MJ, Noble WS, Hoofnagle AN. Tandem Mass Spectrometry-Based Amyloid Typing Using Manual Microdissection and Open-Source Data Processing. Am J Clin Pathol 2022; 157:748-757. [PMID: 35512256 PMCID: PMC9071319 DOI: 10.1093/ajcp/aqab185] [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: 07/21/2021] [Accepted: 09/20/2021] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Standard implementations of amyloid typing by liquid chromatography-tandem mass spectrometry use capabilities unavailable to most clinical laboratories. To improve accessibility of this testing, we explored easier approaches to tissue sampling and data processing. METHODS We validated a typing method using manual sampling in place of laser microdissection, pairing the technique with a semiquantitative measure of sampling adequacy. In addition, we created an open-source data processing workflow (Crux Pipeline) for clinical users. RESULTS Cases of amyloidosis spanning the major types were distinguishable with 100% specificity using measurements of individual amyloidogenic proteins or in combination with the ratio of λ and κ constant regions. Crux Pipeline allowed for rapid, batched data processing, integrating the steps of peptide identification, statistical confidence estimation, and label-free protein quantification. CONCLUSIONS Accurate mass spectrometry-based amyloid typing is possible without laser microdissection. To facilitate entry into solid tissue proteomics, newcomers can leverage manual sampling approaches in combination with Crux Pipeline and related tools.
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Affiliation(s)
- William S Phipps
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
| | - Kelly D Smith
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
- Department of Medicine, Seattle, WA, USA
| | - Han-Yin Yang
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Clark M Henderson
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
- Seagen, Bothel, WA, USA
| | - Hannah Pflaum
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
- Seattle Children’s Hospital, Seattle, WA, USA
| | - Melissa L Lerch
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
| | - William E Fondrie
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | | | - Christine C Wu
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Michael J MacCoss
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - William S Noble
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine and Pathology, Seattle, WA, USA
- Department of Medicine, Seattle, WA, USA
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Phipps WS, Greene DN, Pflaum H, Laha TJ, Dickerson JA, Irvine J, Merrill AE, Ranjitkar P, Henderson CM, Hoofnagle AN. Small volume retinol binding protein measurement by liquid chromatography-tandem mass spectrometry. Clin Biochem 2022; 99:111-117. [PMID: 34678307 PMCID: PMC8671195 DOI: 10.1016/j.clinbiochem.2021.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/13/2021] [Accepted: 10/17/2021] [Indexed: 01/03/2023]
Abstract
BACKGROUND The measurement of plasma concentrations of retinol binding protein is a component of nutritional assessment in neonatal intensive care. However, serial testing in newborns is hampered by the limited amount of blood that can be sampled. Limitations are most severe with preterm infants, for whom close monitoring may be most important. METHODS We developed an assay to quantify retinol binding protein using trypsin digestion and liquid chromatography-tandem mass spectrometry, which requires a serum or plasma volume of 5 µl. Additionally, we validated the method according to current recommendations and performed comparison with a standard nephelometry platform in clinical use. RESULTS The assay demonstrated linearity from below 1 mg/dL (0.48 µM) to more than 20 mg/dL (9.7 µM), and an imprecision of 11.8% at 0.43 mg/dL (0.21 µM). The distribution of results observed with the new method was different when compared with nephelometry. CONCLUSION Liquid chromatography-tandem mass spectrometry facilitated testing a smaller sample volume, thereby increasing the ability to monitor key nutritional markers in premature infants. The differences in results compared with a commercially-available nephelometric assay revealed questionable results for lower concentrations by immunoassay.
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Affiliation(s)
- William S. Phipps
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Dina N. Greene
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Hannah Pflaum
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Thomas J. Laha
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Jane A. Dickerson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA,Seattle Children’s Hospital, Seattle, WA
| | - Jill Irvine
- University of Washington Medical Center, Seattle, WA
| | - Anna E. Merrill
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Pratistha Ranjitkar
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Clark M. Henderson
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA
| | - Andrew N. Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA,Department of Medicine, University of Washington, Seattle, WA
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Petryshen W, Henderson CM, De Baets K, Jarochowska E. Evidence of parallel evolution in the dental elements of Sweetognathus conodonts. Proc Biol Sci 2020; 287:20201922. [PMID: 33203328 DOI: 10.1098/rspb.2020.1922] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 01/25/2023] Open
Abstract
The repeated emergence of similar morphologies in the dental elements of Permian Sweetognathus conodonts has been a hypothesized example of parallel evolution. To test if morphological parallelisms occur between isolated Sweetognathus lineages, this study uses two-dimensional-based geometric morphometrics combined with a revised and expanded phylogeny of Permian Sweetognathus conodonts to quantify dental element trait distributions and compare the phenotypic trajectories between lineages. A hierarchical clustering method was used to identify recurrent species pairs based on principal component scores describing their morphological variation, with the further incorporation of widely used ecological metrics such as limiting similarity and morphological overlap. Our research implies that a major contributor to conodont diversity in Palaeozoic marine trophic networks is the emergence of recurrent parallel morphologies via disruptive and directional selection. This study illustrates the mechanisms through which conodonts achieved their status as hyper-diverse predators and scavengers, contributing substantially to the complexity of Palaeozoic marine communities.
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Affiliation(s)
- W Petryshen
- Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
| | - C M Henderson
- Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
| | - K De Baets
- Department of Paleontology, Friedrich-Alexander University Erlangen-Nürnberg, GeoZentrum Nordbayern, Erlangen, Germany
| | - E Jarochowska
- Department of Paleontology, Friedrich-Alexander University Erlangen-Nürnberg, GeoZentrum Nordbayern, Erlangen, Germany
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Walker GA, Henderson CM, Luong P, Block DE, Bisson LF. Downshifting Yeast Dominance: Cell Physiology and Phospholipid Composition Are Altered With Establishment of the [ GAR +] Prion in Saccharomyces cerevisiae. Front Microbiol 2020; 11:2011. [PMID: 32983023 PMCID: PMC7477300 DOI: 10.3389/fmicb.2020.02011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/29/2020] [Indexed: 11/13/2022] Open
Abstract
Establishment of the [GAR +] prion in Saccharomyces cerevisiae reduces both transcriptional expression of the HXT3 hexose transporter gene and fermentation capacity in high sugar conditions. We evaluated the impact of deletion of the HXT3 gene on the expression of [GAR +] prion phenotype in a vineyard isolate, UCD932, and found that changes in fermentation capacity were observable even with complete loss of the Hxt3 transporter, suggesting other cellular functions affecting fermentation rate may be impacted in [GAR +] strains. In a comparison of isogenic [GAR +] and [gar -] strains, localization of the Pma1 plasma membrane ATPase showed differences in distribution within the membrane. In addition, plasma membrane lipid composition varied between the two cell types. Oxygen uptake was decreased in prion induced cells suggesting membrane changes affect plasma membrane functionality beyond glucose transport. Thus, multiple cell surface properties are altered upon induction of the [GAR +] prion in addition to changes in expression of the HXT3 gene. We propose a model wherein [GAR +] prion establishment within a yeast population is associated with modulation of plasma membrane functionality, fermentation capacity, niche dominance, and cell physiology to facilitate growth and mitigate cytotoxicity under certain environmental conditions. Down-regulation of expression of the HXT3 hexose transporter gene is only one component of a suite of physiological differences. Our data show the [GAR +] prion state is accompanied by multiple changes in the yeast cell surface that prioritize population survivability over maximizing metabolic capacity and enable progeny to establish an alternative adaptive state while maintaining reversibility.
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Affiliation(s)
- Gordon A Walker
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
| | - Clark M Henderson
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
| | - Peter Luong
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
| | - David E Block
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
| | - Linda F Bisson
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
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9
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Henderson CM, Fink SL, Bassyouni H, Argiropoulos B, Brown L, Laha TJ, Jackson KJ, Lewkonia R, Ferreira P, Hoofnagle AN, Marcadier JL. Vitamin D-Binding Protein Deficiency and Homozygous Deletion of the GC Gene. N Engl J Med 2019; 380:1150-1157. [PMID: 30893535 PMCID: PMC7898410 DOI: 10.1056/nejmoa1807841] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [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] [Indexed: 12/13/2022]
Abstract
A 58-year-old woman with debilitating ankylosing spondylitis who was born to consanguineous parents was found to have an apparent severe vitamin D deficiency that did not respond to supplementation. Liquid chromatography-tandem mass spectrometry showed the absence of circulating vitamin D-binding protein, and chromosomal microarray confirmed a homozygous deletion of the group-specific component (GC) gene that encodes the protein. Congenital absence of vitamin D-binding protein resulted in normocalcemia and a relatively mild disruption of bone metabolism, in this case complicated by severe autoimmune disease. (Funded by the National Institutes of Health and the University of Washington.).
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Affiliation(s)
- Clark M Henderson
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Susan L Fink
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Hanan Bassyouni
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Bob Argiropoulos
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Lindsay Brown
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Thomas J Laha
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Konner J Jackson
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Raymond Lewkonia
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Patrick Ferreira
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Andrew N Hoofnagle
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
| | - Julien L Marcadier
- From the Departments of Laboratory Medicine (C.M.H., S.L.F., T.J.L., K.J.J., A.N.H.) and Medicine (A.N.H.) and the Kidney Research Institute (A.N.H.), University of Washington, Seattle; and the Department of Endocrinology and Metabolism (H.B.) and the Alberta Children's Hospital Research Institute (B.A.), University of Calgary, and the Division of Medical Genetics, Alberta Children's Hospital (R.L., P.F., J.L.M.), Calgary, and the Department of Pathology, Children's & Women's Health Centre of British Columbia, Vancouver (L.B.) - all in Canada
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10
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Wang K, Zelnick LR, Hoofnagle AN, Vaisar T, Henderson CM, Imrey PB, Robinson-Cohen C, de Boer IH, Shiu YT, Himmelfarb J, Beck GJ. Alteration of HDL Protein Composition with Hemodialysis Initiation. Clin J Am Soc Nephrol 2018; 13:1225-1233. [PMID: 30045914 PMCID: PMC6086713 DOI: 10.2215/cjn.11321017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 04/13/2018] [Indexed: 01/09/2023]
Abstract
BACKGROUND AND OBJECTIVES HDL particles obtained from patients on chronic hemodialysis exhibit lower cholesterol efflux capacity and are enriched in inflammatory proteins compared with those in healthy individuals. Observed alterations in HDL proteins could be due to effects of CKD, but also may be influenced by the hemodialysis procedure, which stimulates proinflammatory and prothrombotic pathways. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We compared HDL-associated proteins in 143 participants who initiated hemodialysis within the previous year with those of 110 participants with advanced CKD from the Hemodialysis Fistula Maturation Study. We quantified concentrations of 38 HDL-associated proteins relative to total HDL protein using targeted mass spectrometry assays that included a stable isotope-labeled internal standard. We used linear regression to compare the relative abundances of HDL-associated proteins after adjustment and required a false discovery rate q value ≤10% to control for multiple testing. We further assessed the association between hemodialysis initiation and cholesterol efflux capacity in a subset of 80 participants. RESULTS After adjustment for demographics, comorbidities, and other clinical characteristics, eight HDL-associated proteins met the prespecified false discovery threshold for association. Recent hemodialysis initiation was associated with higher HDL-associated concentrations of serum amyloid A1, A2, and A4; hemoglobin-β; haptoglobin-related protein; cholesterylester transfer protein; phospholipid transfer protein; and apo E. The trend for participants recently initiating hemodialysis for lower cholesterol efflux capacity compared with individuals with advanced CKD did not reach statistical significance. CONCLUSIONS Compared with advanced CKD, hemodialysis initiation within the previous year is associated with higher concentrations of eight HDL proteins related to inflammation and lipid metabolism. Identified associations differ from those recently observed for nondialysis-requiring CKD. Hemodialysis initiation may further impair cholesterol efflux capacity. Further work is needed to clarify the clinical significance of the identified proteins with respect to cardiovascular risk. PODCAST This article contains a podcast at https://www.asn-online.org/media/podcast/CJASN/2018_07_25_CJASNPodcast_18_8_W.mp3.
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Affiliation(s)
- Ke Wang
- Departments of Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Leila R. Zelnick
- Departments of Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Andrew N. Hoofnagle
- Departments of Medicine and
- Laboratory Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
| | | | | | - Peter B. Imrey
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
- Department of Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio
| | | | - Ian H. de Boer
- Departments of Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Yan-Ting Shiu
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, Utah
| | - Jonathan Himmelfarb
- Departments of Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
| | - Gerald J. Beck
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
- Department of Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio
| | - KestenbaumBryan12on behalf of the HFM Study
- Departments of Medicine and
- Laboratory Medicine and
- Kidney Research Institute, University of Washington, Seattle, Washington
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
- Department of Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio
- Department of Medicine, Vanderbilt University, Nashville, Tennessee; and
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, Utah
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11
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Galitzine C, Egertson JD, Abbatiello S, Henderson CM, Pino LK, MacCoss M, Hoofnagle AN, Vitek O. Nonlinear Regression Improves Accuracy of Characterization of Multiplexed Mass Spectrometric Assays. Mol Cell Proteomics 2018; 17:913-924. [PMID: 29438992 DOI: 10.1074/mcp.ra117.000322] [Citation(s) in RCA: 14] [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] [Received: 09/13/2017] [Revised: 01/16/2018] [Indexed: 01/03/2023] Open
Abstract
The need for assay characterization is ubiquitous in quantitative mass spectrometry-based proteomics. Among many assay characteristics, the limit of blank (LOB) and limit of detection (LOD) are two particularly useful figures of merit. LOB and LOD are determined by repeatedly quantifying the observed intensities of peptides in samples with known peptide concentrations and deriving an intensity versus concentration response curve. Most commonly, a weighted linear or logistic curve is fit to the intensity-concentration response, and LOB and LOD are estimated from the fit. Here we argue that these methods inaccurately characterize assays where observed intensities level off at low concentrations, which is a common situation in multiplexed systems. This manuscript illustrates the deficiencies of these methods, and proposes an alternative approach based on nonlinear regression that overcomes these inaccuracies. We evaluated the performance of the proposed method using computer simulations and using eleven experimental data sets acquired in Data-Independent Acquisition (DIA), Parallel Reaction Monitoring (PRM), and Selected Reaction Monitoring (SRM) mode. When the intensity levels off at low concentrations, the nonlinear model changes the estimates of LOB/LOD upwards, in some data sets by 20-40%. In absence of a low concentration intensity leveling off, the estimates of LOB/LOD obtained with nonlinear statistical modeling were identical to those of weighted linear regression. We implemented the nonlinear regression approach in the open-source R-based software MSstats, and advocate its general use for characterization of mass spectrometry-based assays.
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Affiliation(s)
- Cyril Galitzine
- From the ‡College of Science, Northeastern University, Boston, Massachusetts 02115
| | - Jarrett D Egertson
- §Department of Genome Sciences, University of Washington, Seattle, Washington 98195
| | | | - Clark M Henderson
- ‖Department of Laboratory Medicine, University of Washington, Seattle, Washington 98195
| | - Lindsay K Pino
- §Department of Genome Sciences, University of Washington, Seattle, Washington 98195
| | - Michael MacCoss
- §Department of Genome Sciences, University of Washington, Seattle, Washington 98195
| | - Andrew N Hoofnagle
- ‖Department of Laboratory Medicine, University of Washington, Seattle, Washington 98195.,**Department of Medicine, University of Washington, Seattle, Washington 98195
| | - Olga Vitek
- From the ‡College of Science, Northeastern University, Boston, Massachusetts 02115; .,‡‡College of Computer and Information Science, Northeastern University, Boston, Massachusetts 02115
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12
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Henderson CM, Shulman NJ, MacLean B, MacCoss MJ, Hoofnagle AN. Skyline Performs as Well as Vendor Software in the Quantitative Analysis of Serum 25-Hydroxy Vitamin D and Vitamin D Binding Globulin. Clin Chem 2017; 64:408-410. [PMID: 29203474 DOI: 10.1373/clinchem.2017.282293] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | | | - Andrew N Hoofnagle
- Departments of Laboratory Medicine .,Medicine, University of Washington Seattle, WA
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13
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Rubinow KB, Henderson CM, Robinson-Cohen C, Himmelfarb J, de Boer IH, Vaisar T, Kestenbaum B, Hoofnagle AN. Kidney function is associated with an altered protein composition of high-density lipoprotein. Kidney Int 2017; 92:1526-1535. [PMID: 28754556 DOI: 10.1016/j.kint.2017.05.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/16/2017] [Accepted: 05/18/2017] [Indexed: 12/28/2022]
Abstract
Patients with chronic kidney disease (CKD) exhibit a myriad of metabolic derangements, including dyslipidemia characterized by low plasma concentrations of high-density lipoprotein (HDL)-associated cholesterol. However, the effects of kidney disease on HDL composition have not been comprehensively determined. Here we used a targeted mass spectrometric approach to quantify 38 proteins contained in the HDL particles within a CKD cohort of 509 participants with a broad range of estimated glomerular filtration rates (eGFRs) (CKD stages I-V, and a mean eGFR of 45.5 mL/min/1.73m2). After adjusting for multiple testing, demographics, comorbidities, medications, and other characteristics, eGFR was significantly associated with differences in four HDL proteins. Compared to participants with an eGFR of 60 mL/min/1.73m2 or more, those with an eGFR under 15 mL/min/1.73m2 exhibited 1.89-fold higher retinol-binding protein 4 (95% confidence interval 1.34-2.67), 1.52-fold higher apolipoprotein C-III (1.25-1.84), 0.70-fold lower apolipoprotein L1 (0.55-0.92), and 0.64-fold lower vitronectin (0.48-0.85). Although the HDL apolipoprotein L1 was slightly lower among African Americans than among Caucasian individuals, the relationship to eGFR did not differ by race. After adjustment, no HDL-associated proteins associated with albuminuria. Thus, modest changes in the HDL proteome provide preliminary evidence for an association between HDL proteins and declining kidney function, but this needs to be replicated. Future analyses will determine if HDL proteomics is indeed a clinical predictor of declining kidney function or cardiovascular outcomes.
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Affiliation(s)
- Katya B Rubinow
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Clark M Henderson
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
| | - Cassianne Robinson-Cohen
- Department of Medicine, University of Washington, Seattle, Washington, USA; Kidney Research Institute, University of Washington, Seattle, Washington, USA
| | - Jonathan Himmelfarb
- Department of Medicine, University of Washington, Seattle, Washington, USA; Kidney Research Institute, University of Washington, Seattle, Washington, USA
| | - Ian H de Boer
- Department of Medicine, University of Washington, Seattle, Washington, USA; Kidney Research Institute, University of Washington, Seattle, Washington, USA
| | - Tomas Vaisar
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Bryan Kestenbaum
- Department of Medicine, University of Washington, Seattle, Washington, USA; Kidney Research Institute, University of Washington, Seattle, Washington, USA
| | - Andrew N Hoofnagle
- Department of Medicine, University of Washington, Seattle, Washington, USA; Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA; Kidney Research Institute, University of Washington, Seattle, Washington, USA.
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14
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Henderson CM, Bollinger JG, Becker JO, Wallace JM, Laha TJ, MacCoss MJ, Hoofnagle AN. Quantification by nano liquid chromatography parallel reaction monitoring mass spectrometry of human apolipoprotein A-I, apolipoprotein B, and hemoglobin A1c in dried blood spots. Proteomics Clin Appl 2017; 11. [PMID: 28112871 DOI: 10.1002/prca.201600103] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 08/09/2016] [Revised: 12/20/2016] [Accepted: 01/19/2017] [Indexed: 12/21/2022]
Abstract
PURPOSE Proteomic analysis of blood proteins in dried blood spots (DBS) is gaining attention as a possible replacement for measurements in plasma/serum collected by venipuncture. We aimed to develop and provisionally validate a nanoflow LC-PRM-MS method for clinical use. EXPERIMENTAL DESIGN We used Skyline to develop a nanoflow LC-PRM-MS method to quantify glycated hemoglobin-β, apolipoprotein A-I, and apolipoprotein B in DBS. Precision, linearity, interferences, and stability were determined and the method was used to analyze samples from 36 human volunteers. The method was compared with clinically validated measurements in paired blood collected via venipuncture. RESULTS The method was relatively precise for these proteins (10-11% CV) and linear across the normal concentration ranges of these proteins. Interference from high total serum protein concentration (>8 g/dL) was noted for apolipoprotein A-I and apolipoprotein B. Proteins in DBS were stable for 14 days at temperatures below 25°C and trypsinized samples were stable for 48 h at 7°C. There was moderate correlation with clinical methods (r = 0.783-0.858) and significant bias in individual samples. CONCLUSIONS AND CLINICAL RELEVANCE Although the method had adequate precision and linearity for a biomarker, the accuracy compared with clinically validated assays raises concerns regarding the use of DBS compared with venipuncture for clinical use.
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Affiliation(s)
- Clark M Henderson
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - James G Bollinger
- Departments of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Jessica O Becker
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - Jennifer M Wallace
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - Thomas J Laha
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - Michael J MacCoss
- Departments of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA.,Department of Medicine, University of Washington, Seattle, WA, USA
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15
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Spencer SE, Corso TN, Bollinger JG, Henderson CM, Hoofnagle AN, MacCoss MJ. Automated Trapping Column Exchanger for High-Throughput Nanoflow Liquid Chromatography. Anal Chem 2017; 89:2383-2389. [PMID: 28192907 DOI: 10.1021/acs.analchem.6b04227] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
As compared to conventional high-performance liquid chromatography (HPLC) techniques, nanoflow HPLC exhibits improved sensitivity and limits of detection. However, nanoflow HPLC suffers from low throughput due to instrument failure (e.g., fitting fatigue and trapping column failure), limiting the utility of the technique for clinical and industrial applications. To increase the robustness of nanoflow HPLC, we have developed and tested a trapping column exchanging robot for autonomous interchange of trapping columns. This robot makes reproducible, automated connections between the active trapping column and the rest of the HPLC system. The intertrapping column retention time is shown to be sufficiently reproducible for scheduled selected reaction monitoring assays to be performed on different trapping columns without rescheduling the selection windows.
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Affiliation(s)
- Sandra E Spencer
- Department of Genome Sciences, University of Washington School of Medicine , Box 355065, Seattle, Washington 98195-5065, United States
| | - Thomas N Corso
- CorSolutions, LLC. , Cornell Business and Technology Park, 95 Brown Road, Box 1007, Ithaca, New York 14850-1294, United States
| | - James G Bollinger
- Department of Genome Sciences, University of Washington School of Medicine , Box 355065, Seattle, Washington 98195-5065, United States
| | - Clark M Henderson
- Department of Laboratory Medicine, University of Washington School of Medicine , Box 357110, Seattle, Washington 98195-7110, United States
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington School of Medicine , Box 357110, Seattle, Washington 98195-7110, United States
| | - Michael J MacCoss
- Department of Genome Sciences, University of Washington School of Medicine , Box 355065, Seattle, Washington 98195-5065, United States
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16
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Lutsey PL, Parrinello CM, Misialek JR, Hoofnagle AN, Henderson CM, Laha TJ, Michos ED, Eckfeldt JH, Selvin E. Short-term Variability of Vitamin D-Related Biomarkers. Clin Chem 2016; 62:1647-1653. [PMID: 27694392 DOI: 10.1373/clinchem.2016.261461] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/19/2016] [Indexed: 12/19/2022]
Abstract
BACKGROUND Quantifying the variability of biomarkers is important, as high within-person variability can lead to misclassification of individuals. Short-term variability of important markers of vitamin D metabolism is relatively unknown. METHODS A repeatability study was conducted in 160 Atherosclerosis Risk in Communities study participants (60% female, 28% black, mean age 76 years). Fasting serum was drawn at 2 time points, a median of 6 (range 3-13) weeks apart. Vitamin D binding protein (VDBP) and 25-hydroxyvitamin D [25(OH)D] were measured by LC-MS, fibroblast growth factor (FGF23) and parathyroid hormone (PTH) by enzyme-linked immunoassay, and calcium and phosphorus by Roche Cobas 6000. Free and bioavailable 25(OH)D were calculated. We calculated the within-person CV (CVW), intraclass correlation coefficient (ICC), Spearman rank correlation coefficient (r), and percent reclassified. RESULTS The CVW was lowest for calcium (2.0%), albumin (3.6%), 25(OH)D (6.9%), VDBP (7.0%) and phosphorus (7.6%); intermediate for free 25(OH)D (9.0%) and bioavailable 25(OH)D (9.9%); and highest for PTH (16.7%) and FGF23 (17.8%). Reclassification was highest for PTH, VDBP, and phosphorus (all 7.5%). The ICC and r were highest (≥0.80) for 25(OH)D, free 25(OH)D, bioavailable 25(OH)D and PTH, but somewhat lower (approximately 0.60-0.75) for the other biomarkers. CONCLUSIONS Six-week short-term variability, as assessed by CVW, was quite low for VDBP, calcium and phosphorus, but fairly high for FGF23 and PTH. As such, multiple measurements of FGF23 and PTH may be needed to minimize misclassification. These results provide insight into the extent of potential misclassification of vitamin D markers in research and clinical settings.
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Affiliation(s)
- Pamela L Lutsey
- Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, MN;
| | - Christina M Parrinello
- Department of Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY
| | - Jeffrey R Misialek
- Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, MN
| | - Andy N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA
| | - Clark M Henderson
- Department of Laboratory Medicine, University of Washington, Seattle, WA
| | - Thomas J Laha
- Department of Laboratory Medicine, University of Washington, Seattle, WA
| | - Erin D Michos
- Division of Cardiology, Johns Hopkins University, Baltimore, MD.,Department of Epidemiology and the Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - John H Eckfeldt
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Elizabeth Selvin
- Department of Epidemiology and the Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
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Henderson CM, Vaisar T, Hoofnagle AN. Isolating and Quantifying Plasma HDL Proteins by Sequential Density Gradient Ultracentrifugation and Targeted Proteomics. Methods Mol Biol 2016; 1410:105-20. [PMID: 26867741 PMCID: PMC5501989 DOI: 10.1007/978-1-4939-3524-6_7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The sensitivity and specificity of tandem mass spectrometers have made targeted proteomics the method of choice for the precise simultaneous measurement of many proteins in complex mixtures. Its application to the relative quantification of proteins in high-density lipoproteins (HDL) that have been purified from human plasma has revealed potential mechanisms to explain the atheroprotective effects of HDL. We describe a moderate throughput method for isolating HDL from human plasma that uses sequential density gradient ultracentrifugation, the traditional method of HDL purification, and subsequent trypsin digestion and nanoflow liquid chromatography-tandem mass spectrometry to quantify 38 proteins in the HDL fraction of human plasma. To control for the variability associated with digestion, matrix effects, and instrument performance, we normalize the signal from endogenous HDL protein-associated peptides liberated during trypsin digestion to the signal from peptides liberated from stable isotope-labeled apolipoprotein A-I spiked in as an internal standard prior to digestion. The method has good reproducibility and other desirable characteristics for preclinical research.
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Affiliation(s)
- Clark M Henderson
- Department of Laboratory Medicine, University of Washington School of Medicine, Box 357110, Seattle, WA, 98195-7110, USA
| | - Tomas Vaisar
- Department of Medicine, University of Washington School of Medicine, Box 358055, Seattle, WA, 98195-8055, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington School of Medicine, Box 357110, Seattle, WA, 98195-7110, USA.
- Department of Medicine, University of Washington School of Medicine, Box 358055, Seattle, WA, 98195-8055, USA.
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18
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Henderson CM, Lutsey PL, Misialek JR, Laha TJ, Selvin E, Eckfeldt JH, Hoofnagle AN. Measurement by a Novel LC-MS/MS Methodology Reveals Similar Serum Concentrations of Vitamin D-Binding Protein in Blacks and Whites. Clin Chem 2015; 62:179-87. [PMID: 26453697 DOI: 10.1373/clinchem.2015.244541] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 08/28/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND Vitamin D deficiency is associated with poor bone health and other adverse health outcomes; however, the associations are greatly attenuated in black vs white individuals. One possible explanation for this attenuation is different concentrations of bioavailable vitamin D metabolites in plasma, which are estimated with equations that include the total concentration of vitamin D binding globulin (VDBG) and haplotype-specific dissociation constants. METHODS We developed a method to quantify VDBG with LC-MS/MS that could also identify the haplotypes/isoforms of VDBG present. We validated the method according to recent recommendations for publications of biomarker studies. We determined serum VDBG concentrations in samples from the Atherosclerosis Risk in Communities cohort and compared the results with a widely used monoclonal immunoassay. RESULTS With 10 μL of serum or plasma, the lower limit of quantification for the assay (<20% CV) was 71 μg/mL. The assay was linear from 62 to 434 μg/mL, with total imprecision of 7.3-9.0% CV at approximately 250 μg/mL. Significant hemolysis interfered with quantification. The identification of isoforms was 97% concordant with genotyping (κ coefficient). Method comparison with immunoassay revealed significant isoform-specific effects in the immunoassay. Mean concentrations (SD) of VDBG by mass spectrometry were similar in whites and blacks [262 (25) vs 266 (35) μg/mL, respectively; P = 0.43]. CONCLUSIONS Validated mass spectrometric methods for the quantification of proteins in human samples can provide additional information beyond immunoassay. Counter to prior observations by immunoassay, VDBG concentrations did not vary by race.
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Affiliation(s)
| | | | | | | | - Elizabeth Selvin
- Department of Epidemiology and the Welch Center for Prevention, Epidemiology and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - John H Eckfeldt
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine and Department of Medicine, University of Washington, Seattle, WA;
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19
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Henderson CM, Lozada-Contreras M, Naravane Y, Longo ML, Block DE. Analysis of major phospholipid species and ergosterol in fermenting industrial yeast strains using atmospheric pressure ionization ion-trap mass spectrometry. J Agric Food Chem 2011; 59:12761-12770. [PMID: 21995817 DOI: 10.1021/jf203203h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Knowledge of the individual lipid species that are associated with ethanol tolerance in Saccharomyces cerevisiae is necessary to understand potential mechanisms of how this organism uses these molecules to mitigate the toxic effects of ethanol. Three industrial yeast strains with varying degrees of ethanol tolerance were examined utilizing normal phase high-performance liquid chromatography and atmospheric pressure ionization-ion-trap mass spectrometry methods to quantitatively determine phospholipid and ergosterol levels at numerous fermentation time points. Both high and low Brix fermentations were performed to assess the sugar utilization capabilities of the strains. The results indicated that the strain with the most robust fermentation characteristics had the highest phosphatidylinositol levels and lowest phosphatidylcholine levels. Examination of the phospholipid structural data from tandem MS experiments indicated that the levels of several phospholipid species were unique to the slowest fermenting strain. The relation of ergosterol and other phospholipids to ethanol tolerance is also discussed.
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Affiliation(s)
- Clark M Henderson
- Biophysics Graduate Group, University of California, One Shields Avenue, Davis, California 95616, United States
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20
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Henderson CM, Block DE, Longo ML. Analysis of Lipid Compositional Changes During Alcoholic Fermentation in Industrial Yeast Strains with Varying Ethanol Tolerance. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.3307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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21
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Henderson CM, Rosasco M, Robinson LM, Meccarello J, Janicki MP, Turk MA, Davidson PW. Functional impairment severity is associated with health status among older persons with intellectual disability and cerebral palsy. J Intellect Disabil Res 2009; 53:887-897. [PMID: 19732278 DOI: 10.1111/j.1365-2788.2009.01199.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
BACKGROUND Studies have noted high rates of specific health disorders in adults with cerebral palsy (CP). However, it remains unclear how growing older with a lifelong neuromotor physical disability confers risk for health outcomes in adults who have both intellectual disability (ID) and CP. AIM To assess the relationship between health status in older adults with ID either with or without coincident diagnoses of CP. METHOD Health status data were drawn from 1373 adults aged 33 to 79 years with ID living in small group homes in New York State. Their health status was defined by the presence of common health disorders. Of these, 177 subjects had coincident CP. Prevalence data for nine diseases representing different organ systems were obtained and compared in individuals with and without CP. A Severity of Functional Impairment Index (SFII) was developed based on subjects' capabilities in activities of daily living (ADLs) and mobility. Two logistic regression analyses were conducted to determine if CP diagnosis was an independent predictor of health disorder prevalence, or rather exerted effects similar to those without CP via severity of functional impairment as determined by SFII scores. In addition, older age, gender, and severity of intellectual disability were examined as predictors of health disorder prevalence in all study subjects. RESULTS Individuals with CP had higher frequencies in four out of the nine health disorders (overweight/obesity, gastroesophageal reflux, urinary tract infections and dysphagia). Analysis revealed a statistically significant association between SFII score and CP diagnosis. CP diagnosis alone was a statistically significant predictor for all of the above four common disorders; however, after adjustment for SFII score was included in health disorder models, only dysphagia showed an independent correlation with a CP diagnosis. CONCLUSION With the exception of dysphagia, impairment in ADLs and walking capabilities, and not CP diagnosis alone, accounted for disparities in specific diseases. Although the diagnosis of CP may be correlated with functional impairment, it alone may play a minor role in determining health trajectories in older persons with conjoint ID and CP.
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Affiliation(s)
- C M Henderson
- University of Rochester, School of Medicine and Dentistry, Rochester, NY 14642, USA.
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22
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Iacobuzio-Donahue CA, Fu B, Yachida S, Luo M, Abe H, Henderson CM, Vilardell F, Wang Z, Keller JW, Banerjee P, Herman JM, Cameron JL, Yeo CJ, Halushka MK, Eshleman JR, Raben M, Klein AP, Hruban RH, Hidalgo M, Laheru D. DPC4 gene status of the primary carcinoma correlates with patterns of failure in patients with pancreatic cancer. J Clin Oncol 2009; 27:1806-13. [PMID: 19273710 DOI: 10.1200/jco.2008.17.7188] [Citation(s) in RCA: 812] [Impact Index Per Article: 54.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Contrary to the extensive data accumulated regarding pancreatic carcinogenesis, the clinical and molecular features characteristic of advanced stage (stage III and IV) disease are unknown. A comprehensive study of pancreatic cancers from patients who have succumbed to their disease has the potential to greatly expand our understanding of the most lethal stage of this disease and identify novel areas for intervention. MATERIALS AND METHODS Rapid autopsies were performed on 76 patients with documented pancreatic cancer. The histologic features of end stage disease were determined and correlated to the stage at initial diagnosis, patterns of failure (locally destructive v metastatic disease) and the status of the KRAS2, TP53, and DPC4 genes. RESULTS At autopsy, 30% of patients died with locally destructive pancreatic cancer, and 70% died with widespread metastatic disease. These divergent patterns of failure found at autopsy (locally destructive v metastatic) were unrelated to clinical stage at initial presentation, treatment history, or histopathologic features. However, Dpc4 immunolabeling status of carcinoma tissues harvested at autopsy, a sensitive marker of DPC4 genetic status, was highly correlated with the presence of widespread metastasis but not with locally destructive tumors (P = .007). CONCLUSION Pancreatic cancers are represented by distinct genetic subtypes with significantly different patterns of failure. Determinations of DPC4 status at initial diagnosis may be of value in stratifying patients into treatment regimens related to local control versus systemic therapy.
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Affiliation(s)
- Christine A Iacobuzio-Donahue
- Department of Pathology, Surgery, and Oncology, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical Institutions, Baltimore, MD 21231, USA.
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Mullendore ME, Koorstra JB, Li YM, Offerhaus GJ, Fan X, Henderson CM, Matsui W, Eberhart CG, Maitra A, Feldmann G. Ligand-dependent Notch signaling is involved in tumor initiation and tumor maintenance in pancreatic cancer. Clin Cancer Res 2009; 15:2291-301. [PMID: 19258443 DOI: 10.1158/1078-0432.ccr-08-2004] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
PURPOSE Aberrant activation of the Notch signaling pathway is commonly observed in human pancreatic cancer, although the mechanism(s) for this activation has not been elucidated. EXPERIMENTAL DESIGN A panel of 20 human pancreatic cancer cell lines was profiled for the expression of Notch pathway-related ligands, receptors, and target genes. Disruption of intracellular Notch signaling, either genetically by RNA interference targeting NOTCH1 or pharmacologically by means of the gamma-secretase inhibitor GSI-18, was used for assessing requirement of Notch signaling in pancreatic cancer initiation and maintenance. RESULTS Striking overexpression of Notch ligand transcripts was detectable in the vast majority of pancreatic cancer cell lines, most prominently JAGGED2 (18 of 20 cases, 90%) and DLL4 (10 of 20 cases, 50%). In two cell lines, genomic amplification of the DLL3 locus was observed, mirrored by overexpression of DLL3 transcripts. In contrast, coding region mutations of NOTCH1 or NOTCH2 were not observed. Genetic and pharmacologic inhibition of Notch signaling mitigated anchorage-independent growth in pancreatic cancer cells, confirming that sustained Notch activation is a requirement for pancreatic cancer maintenance. Further, transient pretreatment of pancreatic cancer cells with GSI-18 resulted in depletion in the proportion of tumor-initiating aldehyde dehydrogenase-expressing subpopulation and was associated with inhibition of colony formation in vitro and xenograft engraftment in vivo, underscoring a requirement for the Notch-dependent aldehyde dehydrogenase-expressing cells in pancreatic cancer initiation. CONCLUSIONS Our studies confirm that Notch activation is almost always ligand dependent in pancreatic cancer, and inhibition of Notch signaling is a promising therapeutic strategy in this malignancy.
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Affiliation(s)
- Michael E Mullendore
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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24
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Abstract
Programmed ribosomal frameshifting provides a mechanism to decode information located in two overlapping reading frames by diverting a proportion of translating ribosomes into a second open reading frame (ORF). The result is the production of two proteins: the product of standard translation from ORF1 and an ORF1-ORF2 fusion protein. Such programmed frameshifting is commonly utilized as a gene expression mechanism in viruses that infect eukaryotic cells and in a subset of cellular genes. RNA secondary structures, consisting of pseudoknots or stem-loops, located downstream of the shift site often act as cis-stimulators of frameshifting. Here, we demonstrate for the first time that antisense oligonucleotides can functionally mimic these RNA structures to induce +1 ribosomal frameshifting when annealed downstream of the frameshift site, UCC UGA. Antisense-induced shifting of the ribosome into the +1 reading frame is highly efficient in both rabbit reticulocyte lysate translation reactions and in cultured mammalian cells. The efficiency of antisense-induced frameshifting at this site is responsive to the sequence context 5' of the shift site and to polyamine levels.
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Affiliation(s)
- Clark M. Henderson
- Department of Human Genetics, University of Utah15 N 2030 E, Room 7410, Salt Lake City, UT 84112-5330, USA
| | - Christine B. Anderson
- Department of Human Genetics, University of Utah15 N 2030 E, Room 7410, Salt Lake City, UT 84112-5330, USA
| | - Michael T. Howard
- Department of Human Genetics, University of Utah15 N 2030 E, Room 7410, Salt Lake City, UT 84112-5330, USA
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25
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Lotan M, Henderson CM, Merrick J. Physical activity for adolescents with intellectual disability. Minerva Pediatr 2006; 58:219-26. [PMID: 16832327] [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: 05/10/2023]
Abstract
Numerous studies have described an association between participation in physical activity and an enhanced sense of well-being. These findings have been documented in both genders across the lifespan. Connections between exercise and positive physical, psychological, emotional and educational outcomes have also been found. New findings indicate that is an ongoing and increasing tendency for sedentary lifestyles across age groups and gender in many countries. In addition, there are many factors that work together to contribute to a sedentary lifestyle in individuals with intellectual and developmental disability (ID/DD). These findings are concerning, and indicate that people with ID/DD are at relatively high risk for the development of multiple negative consequences of physical inactivity. This review presents current literature that addresses the question of physical activity in adolescents with ID/DD. In addition, this review presents the connection between higher levels of physical fitness and better health in youths with ID/DD. Strategies to promote physical activity in the adolescent population with ID/DD are presented. The available evidence base strongly supports the high need for the establishment of community based, easily accessible physical activity programs for children and adolescents with ID/DD.
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Affiliation(s)
- M Lotan
- Therapeutic Department, Zvi Quittman Residential Center, Millie Shime Campus, Elwyn, Jerusalem, Israel
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26
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Baranov PV, Henderson CM, Anderson CB, Gesteland RF, Atkins JF, Howard MT. Programmed ribosomal frameshifting in decoding the SARS-CoV genome. Virology 2005; 332:498-510. [PMID: 15680415 PMCID: PMC7111862 DOI: 10.1016/j.virol.2004.11.038] [Citation(s) in RCA: 162] [Impact Index Per Article: 8.5] [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: 08/04/2004] [Revised: 09/07/2004] [Accepted: 11/30/2004] [Indexed: 11/25/2022]
Abstract
Programmed ribosomal frameshifting is an essential mechanism used for the expression of orf1b in coronaviruses. Comparative analysis of the frameshift region reveals a universal shift site U_UUA_AAC, followed by a predicted downstream RNA structure in the form of either a pseudoknot or kissing stem loops. Frameshifting in SARS-CoV has been characterized in cultured mammalian cells using a dual luciferase reporter system and mass spectrometry. Mutagenic analysis of the SARS-CoV shift site and mass spectrometry of an affinity tagged frameshift product confirmed tandem tRNA slippage on the sequence U_UUA_AAC. Analysis of the downstream pseudoknot stimulator of frameshifting in SARS-CoV shows that a proposed RNA secondary structure in loop II and two unpaired nucleotides at the stem I–stem II junction in SARS-CoV are important for frameshift stimulation. These results demonstrate key sequences required for efficient frameshifting, and the utility of mass spectrometry to study ribosomal frameshifting.
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Affiliation(s)
- Pavel V. Baranov
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
- Bioscience Institute, University College Cork, Cork, Ireland
| | - Clark M. Henderson
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
| | - Christine B. Anderson
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
| | - Raymond F. Gesteland
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
| | - John F. Atkins
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
- Bioscience Institute, University College Cork, Cork, Ireland
| | - Michael T. Howard
- Department of Human Genetics, University of Utah, 15 N 2030 E, Room 7410, Salt Lake City, 84112-5330 UT, USA
- Corresponding author. Fax: +1 801 585 3910.
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27
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Davidson PW, Janicki MP, Ladrigan P, Houser K, Henderson CM, Cain NN. Associations between behavior disorders and health status among older adults with intellectual disability. Aging Ment Health 2003; 7:424-30. [PMID: 14578003 DOI: 10.1080/13607860310001594673] [Citation(s) in RCA: 22] [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: 10/26/2022]
Abstract
Few studies have examined the relationship of behavior and health status among aging persons with intellectual and developmental disabilities (I/DD). Behavioral disorders, which often are coincident with functional decline in older persons with I/DD, may be more related to medical morbidity than previously reported. This cross-sectional study examined the association between health status and behavior disorders with increasing age in a cohort of 60,752 adults with I/DD clustered into four adult-age groupings (21-44, 45-59, 60-74, and >74). Age grouping data suggested an association between morbidity and increased likelihood of behavior symptoms in all but the oldest age grouping. The magnitude of the association and trend varied by specific disease across age groupings compared to that found in healthy cohorts. About 25% of the adults with I/DD had psychiatric diagnoses and the frequency of such diagnoses did not decrease with age grouping. These results suggest that adverse health status may increase the likelihood of persistent behavioral disturbances in older persons with I/DD. Moreover, behavioral disorders may be sentinels for occult medical morbidity, which in turn may be responsive to intervention.
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Affiliation(s)
- P W Davidson
- University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA.
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28
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Janicki MP, Davidson PW, Henderson CM, McCallion P, Taets JD, Force LT, Sulkes SB, Frangenberg E, Ladrigan PM. Health characteristics and health services utilization in older adults with intellectual disability living in community residences. J Intellect Disabil Res 2002; 46:287-298. [PMID: 12000580 DOI: 10.1046/j.1365-2788.2002.00385.x] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
BACKGROUND The health status and health needs of adults with intellectual disability (ID) change with advancing age, and are often accompanied by difficulties with vision, hearing, mobility, stamina and some mental processes. AIM The present study collected health status information on a large cohort of adults with ID aged > or = 40 years living in small group, community-based residences in two representative areas of New York State, USA. METHOD Adult group home residents with ID aged between 40 and 79 years (n = 1371) were surveyed to determine their health status and patterns of morbidity. RESULTS Most subjects were characterized as being in good health. The frequency of cardiovascular, musculoskeletal and respiratory conditions, and sensory impairments increased with age, while neurological, endocrine and dermatological diseases did not. Psychiatric and behavioural disorders declined with increasing age, at least through 70 years of age. Although most conditions increased with age, their frequency varied by sex and level of ID. Frequencies of age-related organ system morbidity were compared to data from the National Health and Nutrition Evaluation Survey III. It was found that adults with ID had a lower overall reported frequency of cardiovascular risk factors, including hypertension and hyperlipidaemia, and adult-onset diabetes. Inconsistencies with mortality data among older adults with ID were observed (which showed equal if not greater prevalence of deaths as a result of cardiovascular disease and cancer). CONCLUSION These results suggest that either a cohort effect is operating (i.e. contemporary populations are healthier than previous populations), or that there may be under-recognition of select risk factors and diseases.
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Affiliation(s)
- M P Janicki
- School of Medicine and Dentistry, University of Rochester, Rochester, New York, USA.
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29
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Abstract
Previous studies have shown that ethanol produces conditioned place preference (CPP) in mice when injections are given immediately before exposure to the conditioned stimulus (CS). Paradoxically, however, injection of ethanol immediately after the CS produces conditioned place aversion (CPA). Four experiments were conducted to characterize the parametric boundaries of CPA produced by post-CS ethanol exposure. Experiment 1 showed that CPA is positively related to ethanol dose, with significant CPA at 2 and 4 g / kg, but not at 1 g / kg. Experiment 2 revealed an inverse relationship between CPA and trial duration, i.e. significant CPA occurred when the trial duration was 5, 15 or 30 min, but not when it was 60 or 90 min. Experiment 3 indicated that ethanol pre-exposure (eight daily injections) significantly reduced subsequent development of CPA. Finally, experiment 4 showed that repeated exposure to the CS alone (six 30 min exposures to each CS) after CS-ethanol pairings produced complete extinction of CPA. The same extinction procedure also completely eliminated CPP induced by pre-CS injections of ethanol. Overall, these studies demonstrate that CPA induced by post-CS ethanol injection is influenced by many of the same variables that affect CPP produced by pre-CS ethanol injection in mice. However, these findings do not resolve the issue of whether the 'before-versus-after' effect in ethanol place conditioning is better explained by assuming ethanol produces only rewarding effects or by assuming that ethanol produces both rewarding and aversive effects.
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Affiliation(s)
- C L Cunningham
- Department of Behavioral Neuroscience and Portland Alcohol Research Center, The Oregon Health Sciences University, 97201-3098, USA.
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Janicki MP, Dalton AJ, Henderson CM, Davidson PW. Mortality and morbidity among older adults with intellectual disability: health services considerations. Disabil Rehabil 1999; 21:284-94. [PMID: 10381241 DOI: 10.1080/096382899297710] [Citation(s) in RCA: 241] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE Described is a study of the mortality and morbidity characteristics of 2752 adults with intellectual disability, age 40 and older, who died over a 10 year period in one American state. RESULTS The main finding was that although individuals in the current generation of older adults with intellectual disability still generally die at an earlier age than do adults in the general population (average age at death: 66.1 years), many adults with intellectual disability live as long as their age peers in the general population. The results suggest that the longevity of adults with intellectual disability, whose aetiology is not attributable to organic causes, is progressively increasing. The results also confirm an increased longevity for adults with Down syndrome (average age at death: 55.8 years). Findings also showed that the causes of death for the study cohort were similar to those of the general older population, with cardiovascular, respiratory and neoplastic diseases among the most prominent causes of death. CONCLUSIONS It was proposed that clinical and prophylactic health practices could have significant social and health care consequences for delaying the onset or minimizing the occurrence of life threatening diseases (and thus prolonging life) in adults with intellectual disability. It was suggested that clinical practices could be implemented that deter the onset and lessen the impact and burden of older age-related diseases and secondary conditions and that greater attention needs to be given to training of health care professionals in the area of geriatric medicine and intellectual disability.
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Affiliation(s)
- M P Janicki
- New York State Office of Mental Retardation and Developmental Disabilities, Staten Island, USA.
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31
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Charnock JM, Henderson CM, Seward TM. High-temperature indium(III) solutions. J Synchrotron Radiat 1999; 6:607-608. [PMID: 15263396 DOI: 10.1107/s0909049598016987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/1998] [Accepted: 12/09/1998] [Indexed: 05/24/2023]
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32
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Cunningham CL, Henderson CM, Bormann NM. Extinction of ethanol-induced conditioned place preference and conditioned place aversion: effects of naloxone. Psychopharmacology (Berl) 1998; 139:62-70. [PMID: 9768543 DOI: 10.1007/s002130050690] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [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] [Indexed: 10/28/2022]
Abstract
Four experiments examined the effect of naloxone pretreatment on the expression and extinction of ethanol-induced conditioned place preference (experiments 1, 2, 4) or conditioned place aversion (experiments 1, 3). DBA/2 J mice received four pairings of a distinctive tactile (floor) stimulus (CS) with injection of ethanol (2 g/kg) given either immediately before or after 5-min exposure to the CS. A different stimulus was paired with injection of saline. Pre-CS injection of ethanol produced conditioned place preference, whereas post-CS injection of ethanol produced conditioned place aversion. Both behaviors extinguished partially during repeated choice testing after vehicle injection. Naloxone (10 mg/kg) had little effect on the initial expression of conditioned place preference, but facilitated its extinction. Moreover, repeated naloxone testing resulted in the expression of a weak conditioned place aversion to the CS that initially elicited a place preference. In contrast, naloxone (1.5 or 10 mg/kg) enhanced expression of conditioned place aversion, thereby increasing its resistance to extinction. A control experiment (experiment 4) indicated that repeated testing with a different aversive drug, lithium chloride, did not affect rate of extinction or produce an aversion to the CS previously paired with ethanol. These findings do not support the suggestion that naloxone facilitates the general processes that underlie extinction of associative learning. Also, these data are not readily explained by the conditioning of place aversion at the time of testing. Rather, naloxone's effects appear to reflect a selective influence on maintenance of ethanol's conditioned rewarding effect, an effect that may be mediated by release of endogenous opioids. Overall, these findings encourage further consideration of the use of opiate antagonists in the treatment of alcoholism.
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Affiliation(s)
- C L Cunningham
- Department of Behavioral Neuroscience and Portland Alcohol Research Center, The Oregon Health Sciences University, 97201-3098, USA
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33
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Abstract
Knowledge of preretirement planning among women has not been a major focal point for researchers. The purpose of this study was to test a model for understanding preretirement planning among working women and to describe and explain preretirement health and financial plans. A multivariate method of analysis was used with a sample of 145 working female registered nurses, 40 years of age or older, from a major health sciences institution. Data were collected with a mailed questionnaire that measured knowledge, beliefs, and attitudes of women regarding health and financial preretirement planning. The results of this study indicated that formal and informal methods of planning for retirement were limited. Knowledge of health maintenance issues and economic issues were found to be helpful in making plans for the retirement years. This study identifies strengths and weaknesses in the preretirement planning process of working women and contributes to the expansion of knowledge to reduce problems during retirement.
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Affiliation(s)
- S D Wiggins
- College of Nursing, University of South Alabama, USA
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Schofield PF, Henderson CM, Cressey G, van der Laan G. 2p X-ray Absorption Spectroscopy in the Earth Sciences. J Synchrotron Radiat 1995; 2:93-8. [PMID: 16714795 DOI: 10.1107/s0909049595000598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
A complete knowledge of 3d transition-metal valencies, site occupancies and site symmetries is essential for a full understanding of mineral/melt energetics and behaviour. Over the last few years, significant advances in both instrumentation and theory associated with synchrotron radiation sources and experiments have enabled the development of 2p X-ray absorption spectroscopy as a sensitive, element-specific site and valency probe. The potential of this technique in the Earth sciences is discussed in this paper with examples reflecting the variety of problems set by 3d transition metals in natural systems.
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Henderson CM, Wiggins SD. Proactive versus reactive recruitment and retention strategies. J Nurs Staff Dev 1993; 9:193-5. [PMID: 8366376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
With so many options available to nurses today, it is imperative to recognize the importance of not only recruiting but retaining nurses within the organization as well as the profession. This study identifies recruitment and retention strategies that nurses deem important. Although numerous responses were noted, continuing education was the most frequently cited benefit for recruitment and retention of nurses.
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Henderson CM, Rhodes R, Ward A. Dual benefits of a quality assurance practicum. J Nurs Care Qual 1992; Suppl:56-8. [PMID: 1550940 DOI: 10.1097/00001786-199207001-00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Henderson CM, Rhodes RS, Ward AS. Perioperative experience: an essential component for nursing education. Todays OR Nurse 1992; 14:7-10. [PMID: 1570644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
1. Many of today's nursing curricula have limited or no exposure in perioperative nursing. This deficit probably has contributed to the current crisis level in the shortage of nurses occurring in this area. 2. As a recruitment tool and orientation package, the clinical practicum and perioperative elective are a cost-effective means of teaching, increase the self-esteem of the graduates, and provide long-term problem solving experiences. 3. In addition to applying accrued theory to a clinical setting for an extended period, students are allowed to experience an area of nursing without a formal commitment to an agency.
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Hulet EK, Wild JF, Dougan RJ, Lougheed RW, Landrum JH, Dougan AD, Baisden PA, Henderson CM, Dupzyk RJ, Hahn RL, Schädel M, Sümmerer K, Bethune GR. Spontaneous fission properties of 258Fm, 259Md, 260Md, 258No, and 260. Phys Rev C Nucl Phys 1989; 40:770-784. [PMID: 9966041 DOI: 10.1103/physrevc.40.770] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Hulet EK, Lougheed RW, Wild JF, Dougan RJ, Moody KJ, Hahn RL, Henderson CM, Dupzyk RJ, Bethune GR. Z and A identification of 370- micros 258Fm. Phys Rev C Nucl Phys 1986; 34:1394-1396. [PMID: 9953596 DOI: 10.1103/physrevc.34.1394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Dahl FC, Conway MF, Henderson CM. Joint pharmacy/nursing procedure for monitoring unit dose distribution and unadministered doses. Hosp Pharm 1986; 21:857-60. [PMID: 10278987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
This article describes a procedure that uses a multidisciplinary approach to quality assurance in a unit-dose distribution system. The procedure described here uses an assigned nurse and one member of the pharmacy staff (pharmacist, technician/intern) on each nursing unit to check the physical contents of medication cassettes as well as compare pharmacy patient profiles with nursing medication administration records. In examining data from a 184 calendar day period, there was an average of 822 doses of medication per day, including IV admixtures and piggybacks, checked using this system. The time spent in the checking process was approximately 40 minutes per day for each of the three pharmacy staff members performing the check. The average daily census during this period was 60 patients, located on two medical/surgical nursing units, a combined short-procedure unit/detox unit, and an eight-bed critical care unit. The procedure presented also includes a mechanism for the nursing staff to easily document unadministered doses in a manner that provides the pharmacy department with this information. The procedure described makes it extremely difficult for certain types of medication errors to extend beyond a 24-hour period. It also controls missing doses. We found during the 184-day period that only 12 doses were reported missing from the cassettes after the check process. The low number of missing doses reported can be attributed to the fact that the assigned nurse and member of the pharmacy staff verify the presence of a 24-hour supply of medication.
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Hulet EK, Wild JF, Dougan RJ, Lougheed RW, Landrum JH, Dougan AD, Schadel M, Hahn RL, Baisden PA, Henderson CM, Dupzyk RJ, Sümmerer K, Bethune GR. Bimodal symmetric fission observed in the heaviest elements. Phys Rev Lett 1986; 56:313-316. [PMID: 10033155 DOI: 10.1103/physrevlett.56.313] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Henderson CM, Hennessy RG, Shuey HM, Shackelford EG. Posterior-lateral foraminotomy as an exclusive operative technique for cervical radiculopathy: a review of 846 consecutively operated cases. Neurosurgery 1983; 13:504-12. [PMID: 6316196 DOI: 10.1227/00006123-198311000-00004] [Citation(s) in RCA: 247] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Between 1963 and 1980, one or more posterior-lateral foraminotomies were performed for simple cervical radiculopathy as the sole operative procedure for 736 patients. One hundred three patients (14%) required a second posterior procedure, but only 24 (3%) cases represented true recurrent radiculopathy. There were 13 minor complications (1.5%) and no deaths or detectable incidence of air embolism. All operations were done with the patient in the sitting position. Central venous pressure monitoring was used only infrequently. There was a 96% incidence of relief of significant arm pain and/or paresthesia and a 98% incidence of resolution of preoperatively present motor deficit. Eight hundred twenty-eight procedures (98%) were preceded by Pantopaque cervical myelography. There was a 71.5% incidence of correlation between preoperative clinical findings (both sensory and motor) and operative findings. In 13% of the cases, two spaces were thought by the operating surgeon to be equally involved by the spondylotic process. Most (91.5%) of the patients describe themselves as either "good or excellent" postoperatively. There was no significant difference postoperatively regarding results or recurrence between patients with suspected soft or hard disc protrusions and those with strictly spondylotic radiculopathy. Nor was there any statistical difference in results among the three patient population groups ("private" vs. compensation vs. liability). The mean length of time to return to work or other "normal" activities was 9.4 weeks. The mean length of follow-up time was 146 weeks (2.8 years). There was an associated incidence of significant lumbar disc and/or foraminal disease requiring operation of 33.4%.
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Abstract
The laboratory rat is the most commonly used species in safety evaluation of pharmaceutical compounds. However, surface preparations of the organ of Corti (OC) are difficult to perform in this species largely due to problems in removing the thick, bony otic capsule. A modified technique was developed using rapid decalcification to solve this problem. In addition, scanning electron microscopy was used to quantitate hair cell damage and/or loss after exposure of the OC by microdissection. It was found that hair cell loss and amage could be easily detected and quantified in rats given gentamicin sulfate.
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Abstract
✓ Thirty hydrocephalic children with obstruction of the cerebral aqueduct were treated by aqueductal catheterization (interventriculostomy). The complications encountered in the early cases have led to the use of a two-shunt technique. The surgical mortality of 13% compares favorably with that of other methods, and the possibility of a permanent cure of the hydrocephalus eliminating the problems of shunts and shunt dependence makes this approach an appealing one to the authors.
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Henderson CM, Adams JE, Meyer PD. Development of a new carotid artery aneurysm in a patient with a previously operated ipsilateral carotid aneurysm. Md State Med J 1966; 15:33-34. [PMID: 5981010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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