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Morozova N, Avramovič MZ, Markelj G, Toplak N, Avčin T. Dynamics of serum levels of TNF-α in a longitudinal follow-up study in 98 patients with juvenile idiopathic arthritis treated with anti-TNF-α biological drugs. Clin Rheumatol 2024; 43:2287-2293. [PMID: 38775868 PMCID: PMC11189329 DOI: 10.1007/s10067-024-07012-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/12/2024] [Accepted: 05/15/2024] [Indexed: 06/19/2024]
Abstract
OBJECTIVE To determine the dynamics of serum levels of TNF-α in patients with juvenile idiopathic arthritis (JIA) treated with anti-TNF-α biological drugs and investigate their association with the disease activity. METHODS We conducted a single-centre, observational cohort study in 98 patients with JIA (30 boys, 68 girls, mean age 11.3 years) treated with anti-TNF-α biological drugs. Clinical examinations and laboratory assessments of serum levels of TNF-α were performed before starting therapy with biological drug and at 6-month intervals afterwards up to 2.5 years. RESULTS The analysis of serum levels of TNF-α in relation to the disease activity states showed the highest mean serum levels of TNF-α in patients on etanercept who had low disease activity states and in patients on adalimumab who had inactive disease. The correlation analysis in patients with JIA treated with etanercept or adalimumab showed a weak negative correlation between the serum levels of TNF-α and JADAS10 scores (p = 0.007), (r = - 0.177). CONCLUSION The assessment of serum levels of TNF-α in children with JIA during treatment with etanercept or adalimumab is not a reliable biomarker of disease activity or immunological remission. Longitudinal measurement of TNF-α has no added clinical value in patients with JIA treated with anti-TNF-α biological drugs. Key Points • There is limited evidence regarding the effect of anti-TNF therapy on serum concentrations of TNF-α in patients with juvenile idiopathic arthritis • Our study showed an increase in the serum level of TNF-α after the initiation of therapy with either etanercept or adalimumab, which was more significant in patients with inactive or low disease activity • Serum TNF-α is most likely not biologically active during therapy with TNF-α inhibitors and therefore not a reliable biomarker of disease activity or immunological remission in patients with juvenile idiopathic arthritis.
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Affiliation(s)
- N Morozova
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Centre Ljubljana, Bohoričeva Ulica 20, SI-1525, 1000, Ljubljana, Slovenia
| | - M Zajc Avramovič
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Centre Ljubljana, Bohoričeva Ulica 20, SI-1525, 1000, Ljubljana, Slovenia
| | - G Markelj
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Centre Ljubljana, Bohoričeva Ulica 20, SI-1525, 1000, Ljubljana, Slovenia
| | - N Toplak
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Centre Ljubljana, Bohoričeva Ulica 20, SI-1525, 1000, Ljubljana, Slovenia
- Department of Pediatrics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - T Avčin
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Centre Ljubljana, Bohoričeva Ulica 20, SI-1525, 1000, Ljubljana, Slovenia.
- Department of Pediatrics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
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Chowdhury RN, Armato A, Culver E, Shteynman L, Kurien C, Cradin B, Margolin F, Nguyen T, Cardona C, Kabir N, Garruto RM, Lum JK, Wander K. Quantitative and qualitative analysis of stability for 16 serum immunoregulators over 50 freeze-thaw cycles. Am J Hum Biol 2024:e24087. [PMID: 38682460 DOI: 10.1002/ajhb.24087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 03/31/2024] [Accepted: 04/10/2024] [Indexed: 05/01/2024] Open
Abstract
OBJECTIVES To evaluate the reliability of data from the assay of bio-archived specimens, a 50-freeze-thaw-cycle (FTC) degradation study of fresh sera was conducted to test the stability of 16 immunoregulators. METHODS Twenty de-identified serum specimens were obtained from volunteers at United Health Services-Wilson Memorial Hospital. Specimens were stored at -20°C and underwent daily 1 h thawing and subsequent freezing for each FTC over 50 consecutive days. Immunoregulator concentrations were assessed via enzyme-linked immunosorbent assay (ELISA) in participant samples at 2 FTC (baseline), 25 FTC, and 50 FTC. Specific immunoregulators observed in the study were C-reactive protein (CRP), interleukin (IL)-1α, 4, 6, 8, 10, monocyte chemoattractant protein-1 (MCP-1, CCL2), monocyte chemoattractant protein-2 (MCP-2, CCL8), eotaxin-1, thymus-and-activation-regulated chemokine (TARC, CCL17), regulated on activation normal T-cell expressed and secreted (RANTES, CCL5), growth-regulated oncogene-alpha (GRO-α, CXCL1), small inducible cytokine A1 (I-309, CCL1), interferon-gamma (IFN-γ), interferon-gamma inducible protein-10 (IP-10, CXCL10), and tumor necrosis factor-alpha (TNF-α). RESULTS Quantitative stability of serum immunoregulators: Serum CRP, IL-8, IL-10, IFN-γ, IP-10, and eotaxin-1 levels appear to be statistically equivalent from baseline to 50 FTC (p ≤ .05). Retention of patterns in serum immunoregulators: patterns across FTC were retained for TARC (age) and CRP, IFN-γ, and MCP-2 (sex). CONCLUSIONS While the effect of multiple FTC on serum immunoregulator levels may not replicate prolonged freezer storage, the results of this study provide valuable information on the robustness of immunoregulators for research using bio-archived sera.
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Affiliation(s)
- R N Chowdhury
- Department of Anthropology, Binghamton University, Binghamton, New York, USA
- Department of Child and Family Studies, University of South Florida, Tampa, Florida, USA
| | - A Armato
- United Health Services Wilson Memorial Hospital, Johnson City, New York, USA
| | - E Culver
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - L Shteynman
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
- Renaissance School of Medicine at Stony Brook University, Stony Brook, New York, USA
| | - C Kurien
- Department of Integrative Neuroscience, Binghamton University, Binghamton, New York, USA
- College of Osteopathic Medicine, New York Institute of Technology, Long Island, New York, USA
| | - B Cradin
- Department of Integrative Neuroscience, Binghamton University, Binghamton, New York, USA
| | - F Margolin
- Department of Integrative Neuroscience, Binghamton University, Binghamton, New York, USA
| | - T Nguyen
- Department of Integrative Neuroscience, Binghamton University, Binghamton, New York, USA
| | - C Cardona
- Department of Integrative Neuroscience, Binghamton University, Binghamton, New York, USA
| | - N Kabir
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
- Lake Erie College of Osteopathic Medicine, Elmira, New York, USA
| | - R M Garruto
- Department of Anthropology, Binghamton University, Binghamton, New York, USA
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - J K Lum
- Department of Anthropology, Binghamton University, Binghamton, New York, USA
- Department of Biological Sciences, Binghamton University, Binghamton, New York, USA
| | - K Wander
- Department of Anthropology, Binghamton University, Binghamton, New York, USA
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Nakamizo T, Cologne J, Kishi T, Takahashi T, Inoue M, Ryukaku H, Hayashi T, Kusunoki Y, Fujiwara S, Ohishi W. Reliability, stability during long-term storage, and intra-individual variation of circulating levels of osteopontin, osteoprotegerin, vascular endothelial growth factor-A, and interleukin-17A. Eur J Med Res 2024; 29:133. [PMID: 38368424 PMCID: PMC10873926 DOI: 10.1186/s40001-024-01722-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 02/09/2024] [Indexed: 02/19/2024] Open
Abstract
BACKGROUND Studies in many populations have reported associations between circulating cytokine levels and various physiological or pathological conditions. However, the reliability of cytokine measurements in population studies, which measure cytokines in multiple assays over a prolonged period, has not been adequately examined; nor has stability during sample storage or intra-individual variation been assessed. METHODS We assessed (1) analytical reliability in short- and long-term repeated measurements; (2) stability and analytical reliability during long-term sample storage, and (3) variability within individuals over seasons, of four cytokines-osteopontin (OPN), osteoprotegerin (OPG), vascular endothelial growth factor-A (VEGF-A), and interleukin-17A (IL-17A). Measurements in plasma or serum samples were made with commercial kits according to standard procedures. Estimation was performed by fitting a random or mixed effects linear model on the log scale. RESULTS In repeated assays over a short period, OPN, OPG, and VEGF-A had acceptable reliability, with intra- and inter-assay coefficients of variation (CV) less than 0.11. Reliability of IL-17A was poor, with inter- and intra-assay CV 0.85 and 0.43, respectively. During long-term storage, OPG significantly decayed (- 33% per year; 95% confidence interval [- 54, - 3.7]), but not OPN or VEGF-A (- 0.3% or - 6.3% per year, respectively). Intra- and inter-assay CV over a long period were comparable to that in a short period except for a slight increase in inter-assay CV of VEGF-A. Within-individual variation was small for OPN and VEGF-A, with intra-class correlations (ICC) 0.68 and 0.83, respectively, but large for OPG (ICC 0.11). CONCLUSIONS We conclude that OPN and VEGF-A can be reliably measured in a large population, that IL-17A is suitable only for small experiments, and that OPG should be assessed with caution due to degradation during storage and intra-individual variation. The overall results of our study illustrate the need for validation under relevant conditions when measuring circulating cytokines in population studies.
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Affiliation(s)
| | | | - Takeshi Kishi
- Division of Clinical Laboratories, RERF, Hiroshima, Japan
| | - Tetsuya Takahashi
- Faculty of Rehabilitation, Hiroshima International University, Hiroshima, Japan
| | - Mayumi Inoue
- Division of Clinical Laboratories, RERF, Hiroshima, Japan
| | | | | | | | - Saeko Fujiwara
- Faculty of Pharmacy, Yasuda Women's University, Hiroshima, Japan
| | - Waka Ohishi
- Department of Clinical Studies, RERF, Hiroshima, Japan
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Thorel M, Roman Y, Leclerc A. Influence of Freezing Temperature, Freezing Duration, and Repeated Freeze/Thaw Cycles on Electrophoretic Profiles in the White Stork ( Ciconia ciconia). J Avian Med Surg 2023; 37:266-274. [PMID: 37962319 DOI: 10.1647/22-00051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Plasma electrophoresis is an ancillary diagnostic tool in avian medicine, with agarose gel electrophoresis (AGE) and capillary zone electrophoresis (CZE) being the most common techniques. Frozen samples can be used for quantitative studies or comparative diagnostic purposes, but stability of avian plasma proteins under freezing is poorly described. To evaluate the influence of plasma freezing on electrophoretograms in white storks (Ciconia ciconia), heparin blood was sampled from 30 individuals during annual health examinations. Plasma samples were obtained after centrifugation of fresh samples and divided into aliquots. Both AGE and CZE were performed on fresh aliquots. The remaining aliquots were frozen at -20°C (-4°F) or -180°C (-292°F) and thawed following different protocols: 1 freeze/thaw cycle after 6 months at -20°C; 1, 2, 4, and 7 cycles over 12 months at -20°C; and 1 cycle after 18 months at -180°C. For both techniques, electrophoretic profiles obtained from these thawed aliquots were compared to fresh electrophoretograms. Quantitatively, significant differences (P < 0.05) in most fractions were seen from 6 months postfreezing at -20°C for both techniques. Fewer statistically significant differences were observed after 18 months under cryogenic preservation (-180°C). Qualitatively, AGE provided more repeatable and stable results than CZE over time on samples stored at -20°C, and electrophoretograms were stable after 18 months of cryogenic storage. An electromigration distortion associated with freezing was seen with CZE only. Plasma samples stored in a conventional freezer (-20°C) should not be compared to fresh plasma. For quantitative studies, cryogenic storage should be privileged.
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Affiliation(s)
- Milan Thorel
- ZooParc de Beauval & Beauval Nature, 41110 Saint-Aignan, France
| | - Yannick Roman
- Le Parc de Clères, Département de Seine Maritime, 76690 Clères, France
| | - Antoine Leclerc
- ZooParc de Beauval & Beauval Nature, 41110 Saint-Aignan, France,
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Temba GS, Vadaq N, Kullaya V, Pecht T, Lionetti P, Cavalieri D, Schultze JL, Kavishe R, Joosten LAB, van der Ven AJ, Mmbaga BT, Netea MG, de Mast Q. Differences in the inflammatory proteome of East African and Western European adults and associations with environmental and dietary factors. eLife 2023; 12:e82297. [PMID: 37555575 PMCID: PMC10473835 DOI: 10.7554/elife.82297] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 08/08/2023] [Indexed: 08/10/2023] Open
Abstract
Non-communicable diseases (NCDs) are rising rapidly in urbanizing populations in sub-Saharan Africa. Assessment of inflammatory and metabolic characteristics of a urbanizing African population and the comparison with populations outside Africa could provide insight in the pathophysiology of the rapidly increasing epidemic of NCDs, including the role of environmental and dietary changes. Using a proteomic plasma profiling approach comprising 92 inflammation-related molecules, we examined differences in the inflammatory proteome in healthy Tanzanian and healthy Dutch adults. We show that healthy Tanzanians display a pro-inflammatory phenotype compared to Dutch subjects, with enhanced activity of the Wnt/β-catenin signalling pathway and higher concentrations of different metabolic regulators such as 4E-BP1 and fibroblast growth factor 21. Among the Tanzanian volunteers, food-derived metabolites were identified as an important driver of variation in inflammation-related molecules, emphasizing the potential importance of lifestyle changes. These findings endorse the importance of the current dietary transition and the inclusion of underrepresented populations in systems immunology studies.
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Affiliation(s)
- Godfrey S Temba
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
- Department of Medical Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University CollegeMoshiUnited Republic of Tanzania
| | - Nadira Vadaq
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
| | - Vesla Kullaya
- Department of Medical Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University CollegeMoshiUnited Republic of Tanzania
- Kilimanjaro Clinical Research Institute, Kilimanjaro Christian Medical CenterMoshiUnited Republic of Tanzania
| | - Tal Pecht
- Department for Genomics and Immunoregulation, Life & Medical Sciences (LIMES) Institute, University of BonnBonnGermany
- Systems Medicine, German Center for Neurodegenerative Diseases (DZNE)BonnGermany
| | - Paolo Lionetti
- Departement NEUROFARBA, University of Florence – Gastroenterology and Nutrition Unit, Meyer Children's HospitalFlorenceItaly
| | | | - Joachim L Schultze
- Department for Genomics and Immunoregulation, Life & Medical Sciences (LIMES) Institute, University of BonnBonnGermany
- Systems Medicine, German Center for Neurodegenerative Diseases (DZNE)BonnGermany
- PRECISE Platform for Single Cell Genomics and Epigenomics, German Center for Neurodegenerative Diseases (DZNE) and University of BonnBonnGermany
| | - Reginald Kavishe
- Department of Medical Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University CollegeMoshiUnited Republic of Tanzania
| | - Leo AB Joosten
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
- Department of Medical Genetics, Iuliu Hatieganu University of Medicine and PharmacyCluj-NapocaRomania
| | - Andre J van der Ven
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
| | - Blandina T Mmbaga
- Kilimanjaro Clinical Research Institute, Kilimanjaro Christian Medical CenterMoshiUnited Republic of Tanzania
- Department of Paediatrics, Kilimanjaro Christian Medical University CollegeMoshiUnited Republic of Tanzania
| | - Mihai G Netea
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
- Department of Immunology and Metabolism, Life & Medical Sciences (LIMES) Institute, University of BonnBonnGermany
| | - Quirijn de Mast
- Department of Internal Medicine, Radboudumc Center for Infectious Diseases, Radboudumc Research Institute for Medical innovation (RIMI), Radboud University Medical CenterNijmegenNetherlands
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Vrzáková R, Šimánek V, Topolčan O, Vurm V, Slouka D, Kučera R. The Stability of the Anti-Müllerian Hormone in Serum and Plasma Samples under Various Preanalytical Conditions. Diagnostics (Basel) 2023; 13:diagnostics13081501. [PMID: 37189609 DOI: 10.3390/diagnostics13081501] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/30/2023] [Accepted: 04/19/2023] [Indexed: 05/17/2023] Open
Abstract
The anti-Müllerian hormone (AMH) is a glycoprotein that plays an important role in prenatal sex differentiation. It is used as a biomarker in polycystic ovary syndrome (PCOS) diagnostics, as well as for estimating an individual's ovarian reserve and the ovarian response to hormonal stimulation during in vitro fertilization (IVF). The aim of this study was to test the stability of AMH during various preanalytical conditions that are in accordance with the ISBER (International Society for Biological and Environmental Repositories) protocol. Plasma and serum samples were taken from each of the 26 participants. The samples were then processed according to the ISBER protocol. AMH levels were measured in all the samples simultaneously using the chemiluminescent kit ACCESS AMH in a UniCel® DxI 800 Immunoassay System (Beckman Coulter, Brea, CA, USA). The study proved that AMH retains a relatively high degree of stability during repeated freezing and thawing in serum. AMH was shown to be less stable in plasma samples. Room temperature proved to be the least suitable condition for the storage of samples before performing the biomarker analysis. During the testing of storage stability at 5-7 °C, the values decreased over time for all the plasma samples but remained stable in the serum samples. We proved that AMH is highly stable under various stress conditions. The anti-Müllerian hormone retained the greatest stability in the serum samples.
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Affiliation(s)
- Radana Vrzáková
- Department of Chemistry and Biochemistry, Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
| | - Václav Šimánek
- Department of Immunochemistry, University Hospital and Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
| | - Ondřej Topolčan
- Department of Immunochemistry, University Hospital and Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
| | - Vladimír Vurm
- Department of Immunochemistry, University Hospital and Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
| | - David Slouka
- Department of Otorhinolaryngology, University Hospital and Faculty of Medicine in Pilsen, Charles University, 30955 Pilsen, Czech Republic
| | - Radek Kučera
- Department of Immunochemistry, University Hospital and Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
- Department of Pharmacology and Toxicology, Faculty of Medicine in Pilsen, Charles University, 32300 Pilsen, Czech Republic
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Giannella E, Notarangelo V, Motta C, Sancesario G. Biobanking for Neurodegenerative Diseases: Challenge for Translational Research and Data Privacy. Neuroscientist 2023; 29:190-201. [PMID: 34353130 DOI: 10.1177/10738584211036693] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Biobanking has emerged as a strategic challenge to promote knowledge on neurological diseases, by the application of translational research. Due to the inaccessibility of the central nervous system, the advent of biobanks, as structure collecting biospecimens and associated data, are essential to turn experimental results into clinical practice. Findings from basic research, omics sciences, and in silico studies, definitely require validation in clinically well-defined cohorts of patients, even more valuable when longitudinal, or including preclinical and asymptomatic individuals. Finally, collecting biological samples requires a great effort to guarantee respect for transparency and protection of sensitive data of patients and donors. Since the European General Data Protection Regulation 2016/679 has been approved, concerns about the use of data in biomedical research have emerged. In this narrative review, we focus on the essential role of biobanking for translational research on neurodegenerative diseases. Moreover, we address considerations for biological samples and data collection, the importance of standardization in the preanalytical phase, data protection (ethical and legal) and the role of donors in improving research in this field.
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Affiliation(s)
- Emilia Giannella
- Biobank, IRCCS Santa Lucia Foundation, Rome, Italy.,Experimental Neuroscience, European Center for Brain Research, Rome, Italy
| | | | - Caterina Motta
- Dept Clinical and Behavioural Neurology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Giulia Sancesario
- Biobank, IRCCS Santa Lucia Foundation, Rome, Italy.,Experimental Neuroscience, European Center for Brain Research, Rome, Italy
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Sjöbom U, Nilsson AK, Gyllensten H, Hellström A, Löfqvist C. A systematic review and meta-analysis of preanalytical factors and methodological differences influencing the measurement of circulating vascular endothelial growth factor. PLoS One 2022; 17:e0270232. [PMID: 35793362 PMCID: PMC9258884 DOI: 10.1371/journal.pone.0270232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 06/06/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Intraocular treatment with antibodies targeting vascular endothelial growth factor (anti-VEGF) inhibits pathological vessel growth in adults and preterm infants. Recently, concerns regarding the impact of anti-VEGF treatment on systemic VEGF levels in preterm infants have been raised. Earlier studies suggest that preanalytical and methodological parameters impact analytical VEGF concentrations, but we have not found a comprehensive systematic review covering preanalytical procedures and methods for VEGF measurements. OBJECTIVE This review aimed to evaluate the most critical factors during sample collection, sample handling, and the analytical methods that influence VEGF levels and therefore should be considered when planning a prospective collection of samples to get reproducible, comparable results. MATERIAL AND METHODS PubMed and Scopus databases were searched 2021/Nov/11. In addition, identification of records via other methods included reference, citation, and Google Scholar searches. Rayyan QCRI was used to handle duplicates and the selection process. Publications reporting preanalytical handling and/or methodological comparisons using human blood samples were included. Exclusion criteria were biological, environmental, genetic, or physiological factors affecting VEGF. The data extraction sheets included bias assessment using the QUADAS-2 tool, evaluating patient selection, index-test, reference standard, and flow and timing. Concentrations of VEGF and results from statistical comparisons of analytical methods and/or preanalytical sample handling and/or different sample systems were extracted. The publications covering preanalytical procedures were further categorized based on the stage of the preanalytical procedure. Meta-analysis was used to visualize VEGF concentrations among healthy individuals. The quality of evidence was rated according to GRADE. RESULTS We identified 1596 publications, and, after the screening process, 43 were considered eligible for this systematic review. The risk of bias estimation was difficult for 2/4 domains due to non-reported information. Four critical steps in the preanalytical process that impacted VEGF quantification were identified: blood drawing and the handling before, during, and after centrifugation. Sub-categorization of those elements resulted in nine findings, rated from moderate to very low evidence grade. The choice of sample system was the most reported factor. VEGF levels (mean [95% CI]) in serum (n = 906, 20 publications), (252.5 [213.1-291.9] pg/mL), were approximated to ninefold higher than in plasma (n = 1122, 23 publications), (27.8 [23.6-32.1] pg/mL), based on summarized VEGF levels with meta-analysis. Notably, most reported plasma levels were below the calibration range of the used method. CONCLUSION When measuring circulating VEGF levels, choice of sample system and sample handling are important factors to consider for ensuring high reproducibility and allowing study comparisons. Protocol: CRD42020192433.
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Affiliation(s)
- Ulrika Sjöbom
- Learning and Leadership for Health Care Professionals At the Institute of Health and Care Science at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
- Department of Clinical Neuroscience At the Institution of Neuroscience and Physiology at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Anders K. Nilsson
- Department of Clinical Neuroscience At the Institution of Neuroscience and Physiology at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Hanna Gyllensten
- Learning and Leadership for Health Care Professionals At the Institute of Health and Care Science at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Ann Hellström
- Department of Clinical Neuroscience At the Institution of Neuroscience and Physiology at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Chatarina Löfqvist
- Learning and Leadership for Health Care Professionals At the Institute of Health and Care Science at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
- Department of Clinical Neuroscience At the Institution of Neuroscience and Physiology at Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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Cameron JM, Rinaldi C, Rutherford SH, Sala A, G Theakstone A, Baker MJ. Clinical Spectroscopy: Lost in Translation? APPLIED SPECTROSCOPY 2022; 76:393-415. [PMID: 34041957 DOI: 10.1177/00037028211021846] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This Focal Point Review paper discusses the developments of biomedical Raman and infrared spectroscopy, and the recent strive towards these technologies being regarded as reliable clinical tools. The promise of vibrational spectroscopy in the field of biomedical science, alongside the development of computational methods for spectral analysis, has driven a plethora of proof-of-concept studies which convey the potential of various spectroscopic approaches. Here we report a brief review of the literature published over the past few decades, with a focus on the current technical, clinical, and economic barriers to translation, namely the limitations of many of the early studies, and the lack of understanding of clinical pathways, health technology assessments, regulatory approval, clinical feasibility, and funding applications. The field of biomedical vibrational spectroscopy must acknowledge and overcome these hurdles in order to achieve clinical efficacy. Current prospects have been overviewed with comment on the advised future direction of spectroscopic technologies, with the aspiration that many of these innovative approaches can ultimately reach the frontier of medical diagnostics and many clinical applications.
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Affiliation(s)
| | - Christopher Rinaldi
- WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, Glasgow, UK
| | - Samantha H Rutherford
- WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, Glasgow, UK
| | - Alexandra Sala
- WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, Glasgow, UK
| | - Ashton G Theakstone
- WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, Glasgow, UK
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Correlation of Repeat Measurements of 27 Candidate Protein Markers for Colorectal Cancer Screening Taken Three Years and Multiple Freeze-Thaw Cycles Apart. Life (Basel) 2022; 12:life12030359. [PMID: 35330110 PMCID: PMC8949042 DOI: 10.3390/life12030359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 02/24/2022] [Accepted: 02/28/2022] [Indexed: 12/04/2022] Open
Abstract
In recent years the blood proteome has been increasingly researched for biomarkers for early detection of colorectal cancer (CRC). Blood samples from screening studies are often subject to preanalytical variability and repeated freeze−thaw cycles. We aimed to assess the correlation of repeat measurements of 27 candidate protein markers for CRC screening taken three years and multiple freeze−thaw cycles apart. The concentrations of 27 protein markers were measured in plasma samples of 39 newly detected CRC cases from a cohort of 9245 participants of screening colonoscopies. The proteins were measured using proximity extension assays (PEA) carried out on the same set of samples twice, three years apart, with an average of three freeze−thaw cycles in between the two measurements. Pearson’s product moment correlation coefficients were calculated. Correlation coefficients ranged from +0.43 to +0.97, with a median of 0.67 and an interquartile range of +0.58 to +0.84, with all p-values of correlation being <0.01 (<0.0005 for 22 proteins, <0.001 for 4 proteins). Repeat measurements of the 27 protein biomarkers for CRC screening performed three years later, and on average three freeze−thaw cycles apart, showed moderate to high levels of correlation. Apart from the effects of freeze−thaw cycles, slightly different preprocessing performed on the data may have contributed to recorded differences between measurements.
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11
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Wik L, Nordberg N, Broberg J, Björkesten J, Assarsson E, Henriksson S, Grundberg I, Pettersson E, Westerberg C, Liljeroth E, Falck A, Lundberg M. Proximity Extension Assay in Combination with Next-Generation Sequencing for High-throughput Proteome-wide Analysis. Mol Cell Proteomics 2021; 20:100168. [PMID: 34715355 PMCID: PMC8633680 DOI: 10.1016/j.mcpro.2021.100168] [Citation(s) in RCA: 94] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 10/14/2021] [Accepted: 10/21/2021] [Indexed: 01/21/2023] Open
Abstract
Understanding the dynamics of the human proteome is crucial for developing biomarkers to be used as measurable indicators for disease severity and progression, patient stratification, and drug development. The Proximity Extension Assay (PEA) is a technology that translates protein information into actionable knowledge by linking protein-specific antibodies to DNA-encoded tags. In this report we demonstrate how we have combined the unique PEA technology with an innovative and automated sample preparation and high-throughput sequencing readout enabling parallel measurement of nearly 1500 proteins in 96 samples generating close to 150,000 data points per run. This advancement will have a major impact on the discovery of new biomarkers for disease prediction and prognosis and contribute to the development of the rapidly evolving fields of wellness monitoring and precision medicine.
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12
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Tuddenham S, Stennett CA, Cone RA, Ravel J, Macintyre AN, Ghanem KG, He X, Brotman RM. Vaginal cytokine profile and microbiota before and after lubricant use compared with condomless vaginal sex: a preliminary observational study. BMC Infect Dis 2021; 21:973. [PMID: 34537015 PMCID: PMC8449901 DOI: 10.1186/s12879-021-06512-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/18/2021] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Limited data suggest that personal lubricants may damage the vaginal mucosal epithelium, alter the vaginal microbiota, and increase inflammation. We compared vaginal cytokine profiles and microbiota before and after vaginal lubricant use and condomless vaginal sex. METHODS Reproductive-age women were recruited to a 10-week observational cohort study and were asked to self-collect vaginal samples and behavioral diaries daily. This nested case-control analysis utilized samples collected before and after self-reported condomless sexual activity with lubricants (22 case participants) and without lubricants (22 control participants). Controls were matched to cases on race/ethnicity. Microbiota composition was characterized by sequencing amplicons of the 16S rRNA gene V3-V4 regions. Cytokine concentrations were quantified using a magnetic bead 41-plex panel assay and read using a Bio-Plex 200 array reader. Wilcoxon signed-rank tests were used to assess baseline differences in vaginal cytokines between cases and controls as well as differences pre- and post-exposure. Linear mixed effects models were used to examine differences in relative post-to-pre change in each individual cytokine between matched cases and controls. Similar analyses were conducted for the microbiota data. RESULTS Mean age was 29.8 years (SD 6.8), and 63.6% were African American. There were few statistically significant changes in cytokines or microbiota before and after exposure in cases or controls. In mixed-effects modeling, the mean relative post-to-pre change of cytokines was higher in cases vs. controls for macrophage derived chemokine (MDC) (p = 0.03). The microbiota data revealed no significant changes when measured by similarity scores, diversity indexes and descriptive community state types (CST) transition analyses. However, post sexual activity, the mean relative abundance of L. crispatus decreased for those who used lubricants (particularly those who were L. iners-dominated prior to exposure). CONCLUSIONS Although there were overall few differences in the vaginal microbiota and cytokine profiles of lubricant users and controls before and after condomless vaginal sex, there was a trend toward decreases in relative abundance of L. crispatus following use of lubricant. Future larger studies that take into account osmolarity and composition of lubricants may provide additional insights.
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Affiliation(s)
- Susan Tuddenham
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Christina A Stennett
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Richard A Cone
- Department of Biophysics, Johns Hopkins University, Baltimore, MD, USA
| | - Jacques Ravel
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Andrew N Macintyre
- Department of Medicine, Duke Human Vaccine Institute, Duke University School of Medicine, Durham, NC, USA
| | - Khalil G Ghanem
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Xin He
- School of Public Health, University of Maryland College Park, College Park, MD, USA
| | - Rebecca M Brotman
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA.
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13
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Liu C, Chu D, Kalantar‐Zadeh K, George J, Young HA, Liu G. Cytokines: From Clinical Significance to Quantification. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2004433. [PMID: 34114369 PMCID: PMC8336501 DOI: 10.1002/advs.202004433] [Citation(s) in RCA: 242] [Impact Index Per Article: 80.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 03/26/2021] [Indexed: 05/24/2023]
Abstract
Cytokines are critical mediators that oversee and regulate immune and inflammatory responses via complex networks and serve as biomarkers for many diseases. Quantification of cytokines has significant value in both clinical medicine and biology as the levels provide insights into physiological and pathological processes and can be used to aid diagnosis and treatment. Cytokines and their clinical significance are introduced from the perspective of their pro- and anti-inflammatory effects. Factors affecting cytokines quantification in biological fluids, native levels in different body fluids, sample processing and storage conditions, sensitivity to freeze-thaw, and soluble cytokine receptors are discussed. In addition, recent advances in in vitro and in vivo assays, biosensors based on different signal outputs and intracellular to extracellular protein expression are summarized. Various quantification platforms for high-sensitivity and reliable measurement of cytokines in different scenarios are discussed, and commercially available cytokine assays are compared. A discussion of challenges in the development and advancement of technologies for cytokine quantification that aim to achieve real-time multiplex cytokine analysis for point-of-care situations applicable for both biomedical research and clinical practice are discussed.
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Affiliation(s)
- Chao Liu
- School of Materials Science and EngineeringUniversity of New South WalesSydneyNSW2052Australia
| | - Dewei Chu
- School of Materials Science and EngineeringUniversity of New South WalesSydneyNSW2052Australia
| | | | - Jacob George
- Storr Liver CentreWestmead Institute of Medical ResearchUniversity of Sydney and Department of Gastroenterology and HepatologyWestmead HospitalWestmeadNSW2145Australia
| | - Howard A. Young
- Laboratory of Cancer ImmunometabolismCenter for Cancer ResearchNational Cancer Institute at FrederickFrederickMD21702USA
| | - Guozhen Liu
- School of Life and Health SciencesThe Chinese University of Hong KongShenzhen518172P. R. China
- Graduate School of Biomedical EngineeringUniversity of New South WalesSydneyNSW2052Australia
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14
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Revuelta-López E, Barallat J, Cserkóová A, Gálvez-Montón C, Jaffe AS, Januzzi JL, Bayes-Genis A. Pre-analytical considerations in biomarker research: focus on cardiovascular disease. Clin Chem Lab Med 2021; 59:1747-1760. [PMID: 34225398 DOI: 10.1515/cclm-2021-0377] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/28/2021] [Indexed: 12/13/2022]
Abstract
Clinical biomarker research is growing at a fast pace, particularly in the cardiovascular field, due to the demanding requirement to provide personalized precision medicine. The lack of a distinct molecular signature for each cardiovascular derangement results in a one-size-fits-all diagnostic and therapeutic approach, which may partially explain suboptimal outcomes in heterogeneous cardiovascular diseases (e.g., heart failure with preserved ejection fraction). A multidimensional approach using different biomarkers is quickly evolving, but it is necessary to consider pre-analytical variables, those to which a biological sample is subject before being analyzed, namely sample collection, handling, processing, and storage. Pre-analytical errors can induce systematic bias and imprecision, which may compromise research results, and are easy to avoid with an adequate study design. Academic clinicians and investigators must be aware of the basic considerations for biospecimen management and essential pre-analytical recommendations as lynchpin for biological material to provide efficient and valid data.
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Affiliation(s)
- Elena Revuelta-López
- Heart Failure Unit and Cardiology Department, Hospital Universitari Germans Trias i Pujol, Badalona, Spain.,CIBERCV, Instituto de Salud Carlos III, Madrid, Spain.,Heart Failure and Cardiac Regeneration (ICREC) Research Program, Health Sciences Research Institute Germans Trias i Pujol (IGTP), Badalona, Barcelona, Spain
| | - Jaume Barallat
- Biochemistry Service, University Hospital Germans Trias i Pujol, Badalona, Spain
| | - Adriana Cserkóová
- Heart Failure and Cardiac Regeneration (ICREC) Research Program, Health Sciences Research Institute Germans Trias i Pujol (IGTP), Badalona, Barcelona, Spain
| | - Carolina Gálvez-Montón
- CIBERCV, Instituto de Salud Carlos III, Madrid, Spain.,Heart Failure and Cardiac Regeneration (ICREC) Research Program, Health Sciences Research Institute Germans Trias i Pujol (IGTP), Badalona, Barcelona, Spain
| | - Allan S Jaffe
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - James L Januzzi
- Cardiology Division, Massachusetts General Hospital Harvard Medical School, Harvard University, Boston, MA, USA
| | - Antoni Bayes-Genis
- CIBERCV, Instituto de Salud Carlos III, Madrid, Spain.,Heart Failure and Cardiac Regeneration (ICREC) Research Program, Health Sciences Research Institute Germans Trias i Pujol (IGTP), Badalona, Barcelona, Spain.,Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain.,Heart Institute, Hospital Universitari Germans Trias i Pujol, Carretera de Canyet s/n, 08916 Badalona, Barcelona, Spain
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15
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Bartolome F, Orive G, Carro E. Standardizing salivary lactoferrin measurements to obtain a robust diagnostic biomarker for Alzheimer's disease. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2021; 13:e12173. [PMID: 33969170 PMCID: PMC8088590 DOI: 10.1002/dad2.12173] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 02/01/2021] [Accepted: 02/18/2021] [Indexed: 12/13/2022]
Abstract
The search for new, robust, and reproducible biomarkers for Alzheimer's disease (AD) diagnosis is a challenge. We recently reported that salivary lactoferrin (Lf) could be presented as new biomarker candidate for AD, being both non-invasive and cost-effective, as well as having appropriate diagnostic performance for the clinical detection of AD subjects. Saliva is an attractive sample type for biomarker-based testing approaches for several other diseases; however, its composition may change under certain circumstances. It is therefore critical to maintain a consistent salivary handling protocol, considering possible extrinsic factors that may influence salivary Lf concentration. In this work, we analyzed salivary Lf concentration under different handling conditions and donor-dependent factors including age, inter-diurnal variations, physical activity, and pharmacological treatments. Our aim was to evaluate the influence of such conditions on salivary Lf concentration. In conclusion, we found that most of these extrinsic factors should be considered in the future when using Lf as a predictive biomarker for AD.
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Affiliation(s)
- Fernando Bartolome
- Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED)CordobaSpain
- Group of Neurodegenerative DiseasesHospital Universitario 12 de Octubre Research Institute (imas12)MadridSpain
| | - Gorka Orive
- Laboratory of Pharmacy and Pharmaceutical TechnologyFaculty of PharmacyUniversity of the Basque CountryVitoriaSpain
- Bioaraba, NanoBioCel Research GroupVitoria‐GasteizSpain
- Networked Center for Biomedical Research in BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)BarcelonaSpain
| | - Eva Carro
- Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED)CordobaSpain
- Group of Neurodegenerative DiseasesHospital Universitario 12 de Octubre Research Institute (imas12)MadridSpain
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Mortensen WCP, Bendix L, Jensen HI, Varnum C, Rasmussen LE, Lauridsen JT, Borbye-Lorenzen N, Skogstrand K, Toft P, Vaegter HB, Blichfeldt-Eckhardt MR. The effect of pre-analytical handling on the stability of fractalkine, monocyte chemoattractant protein 1 (MCP1), interleukin 6 and interleukin 8 in samples of human cerebrospinal fluid. J Immunol Methods 2021; 494:113057. [PMID: 33878334 DOI: 10.1016/j.jim.2021.113057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 04/14/2021] [Accepted: 04/14/2021] [Indexed: 10/21/2022]
Abstract
Cytokine networks in cerebrospinal fluid (CSF) are important to our understanding of several neuroinflammatory diseases. Knowledge about optimal handling of samples is limited but important to minimize bias and reduce costs in CSF biomarker studies. The aim of this study was to examine the effect of storage temperature and time delay from CSF sample collection until freezing on the concentration of 11 different cytokines thought to be associated with chronic pain. CSF samples from 21 individuals undergoing hip or knee arthroplasty under spinal anesthesia were divided between two tubes. One tube was stored and centrifuged (within 30 min) at room temperature, and one tube was stored in ice water and centrifuged (within 30 min) at 4 °C. Each tube was split into six vials that were frozen at -80 °C, 0.5, 1, 2, 3, 4, or 5 h after collection. Cytokines were analyzed using a multiplex panel. A random effect panel data regression was conducted for each biomarker including the variables of storage temperature until freezing and time delay. Four cytokines had detectable levels: Fractalkine, monocyte chemoattractant protein 1(MCP-1), interleukine 6 (IL-6), and interleukine 8 (IL-8). There was no significant effect of storage temperature and time delay on MCP-1, IL-6, or IL-8 concentrations. Fractalkine concentration showed no clear trend. No concentration differences were observed between samples kept in ice water and those at room temperature except at the 3-h time point, and there was no overall significant effect of time delay on fractalkine concentration. We found no clear effect of storage temperature and time delay up to five hours from sample collection until freezing on the CSF concentrations of fractalkine, MCP-1, IL-6, or IL-8.
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Affiliation(s)
| | - Laila Bendix
- Pain Research Group, Pain Center, Odense University Hospital, Heden 9, Odense DK-5000, Denmark
| | - Hanne Irene Jensen
- Department of Anesthesia, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, Vejle DK-7100, Denmark; Department of Regional Health Research, University of Southern Denmark, Winsløwparken 19, Odense DK-5000, Denmark
| | - Claus Varnum
- Department of Regional Health Research, University of Southern Denmark, Winsløwparken 19, Odense DK-5000, Denmark; Department of Orthopedic Surgery, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, Vejle DK-7100, Denmark
| | - Lasse Enkebølle Rasmussen
- Department of Orthopedic Surgery, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, Vejle DK-7100, Denmark
| | - Jørgen T Lauridsen
- Department of Business and Economics, University of Southern Denmark, Campusvej 55, Odense DK-5230, Denmark
| | - Nis Borbye-Lorenzen
- Department of Congenital Disorders, Danish Center for Neonatal Screening, Statens Serum Institut (SSI), Artillerivej 5, Copenhagen, DK-2300, Denmark
| | - Kristin Skogstrand
- Department of Congenital Disorders, Danish Center for Neonatal Screening, Statens Serum Institut (SSI), Artillerivej 5, Copenhagen, DK-2300, Denmark
| | - Palle Toft
- Department of Anesthesiology and Intensive Care Unit, Odense University Hospital, J.B. Winsløws Vej 4, Odense DK-5000, Denmark
| | - Henrik Bjarke Vaegter
- Pain Research Group, Pain Center, Odense University Hospital, Heden 9, Odense DK-5000, Denmark; Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, Odense DK-5000, Denmark
| | - Morten Rune Blichfeldt-Eckhardt
- Pain Research Group, Pain Center, Odense University Hospital, Heden 9, Odense DK-5000, Denmark; Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Winsløwparken 19, Odense DK-5000, Denmark
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17
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Plebani M, Banfi G, Bernardini S, Bondanini F, Conti L, Dorizzi R, Ferrara FE, Mancini R, Trenti T. Serum or plasma? An old question looking for new answers. Clin Chem Lab Med 2021; 58:178-187. [PMID: 31525152 DOI: 10.1515/cclm-2019-0719] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/22/2019] [Indexed: 12/17/2022]
Abstract
Serum or plasma? An old question looking for new answers. There is a continual debate on what type of sample a clinical laboratory should use. While serum is still considered the gold standard and remains the required sample for some assays, laboratories must consider turn-around time, which is an important metric for laboratory performance and, more importantly, plays a critical role in patient care. In addition, a body of evidence emphasise the choice of plasma in order to prevent modifications of some analytes due to the coagulation process and related interferences. Advantages and disadvantages of serum and plasma are discussed on the basis of current literature and evidence. In addition, data are provided on the current utilisation of the samples (serum or plasma) in Italy and in other countries. Finally, a rationale for a possible switch from serum to plasma is provided.
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Affiliation(s)
- Mario Plebani
- Dipartimento Strutturale Medicina di Laboratorio, Azienda Ospedale Università di Padova, Padova, Italy
| | - Giuseppe Banfi
- Direttore Scientifico, IRCCS Istituto Ortopedico Galeazzi, Università Vita e Salute San Raffaele, Milan, Italy
| | - Sergio Bernardini
- Dipartimento di Medicina Sperimentale, Università degli Studi di Tor Vergata, Rome, Italy
| | - Francesco Bondanini
- Unità Operativa Complessa Patologia Clinica Presidio, Ospedaliero Sant'Eugenio/CTO ASL Roma 2, Rome, Italy
| | - Laura Conti
- Patologia Clinica, IRCCS Istituto Nazionale Tumori Regina Elena Roma, Rome, Italy
| | - Romolo Dorizzi
- Unità Operativa Patologia Clinica, AUSL della Romagna, Cesena, Italy
| | - Fulvio Enrico Ferrara
- Direttore Servizio Integrato di Medicina di Laboratorio e Anatomia Patologica, Centro Diagnostico Italiano Spa, Milan, Italy
| | - Rita Mancini
- Laboratorio Unico Metropolitano, AUSL Bologna, Bologna, Italy
| | - Tommaso Trenti
- Dipartimento di Medicina di Laboratorio e Anatomia Patologica Azienda Ospedaliera Universitaria e USL di Modena, Modena, Italy
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Gao J, Ulvik A, McCann A, Ueland PM, Meyer K. Microheterogeneity and preanalytical stability of protein biomarkers of inflammation and renal function. Talanta 2021; 223:121774. [PMID: 33303176 DOI: 10.1016/j.talanta.2020.121774] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/09/2020] [Accepted: 10/11/2020] [Indexed: 02/01/2023]
Abstract
Protein biomarker microheterogeneity has attracted increasing attention in epidemiological and clinical research studies. Knowledge concerning the preanalytical stability of proteins is paramount to assess the biological significance of their proteoforms. We investigated the stability of the inflammatory markers C-reactive protein (CRP), serum amyloid A (SAA), and calprotectin (S100A8/9), and the renal function marker, cystatin C (CnC). In total 16 proteoforms were quantified by immuno-MALDI-TOF MS in EDTA plasma and serum samples from 15 healthy volunteers. Prior to analysis blood samples were stored at either room temperature from 1 h up to 8 days, or underwent up to 9 consecutive freeze/thaw cycles. Pearson's correlation coefficient and t-test, intra-class correlation coefficient (ICC), and Autoregressive Integrated Moving-Average (ARIMA) models were used to investigate the stability of proteoform concentrations and distributions in blood. Plasma and serum concentrations of CRP and SAA proteoforms were highly stable during room temperature exposure and repeated freeze/thaw cycles, demonstrating excellent reproducibility (ICC > 0.75), no serial dependency in ARIMA models, and stable distribution of proteoforms. Stability analyses for proteoforms of S100A8/9 and CnC identified only minor preanalytical changes in concentrations and distributions, and none of the proteoforms were produced during prolonged exposure to room temperature or repeated freezing/thawing. The four proteins and their proteoforms are stable during sub-optimal sample handling, and represent robust biomarker candidates for future biobank studies aimed at investigating the microheterogeneity of SAA, S100A8/9, and CnC in relation to inflammation, renal dysfunction and various clinical outcomes.
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Affiliation(s)
- Jie Gao
- Department of Clinical Science, University of Bergen, 5021, Bergen, Norway.
| | - Arve Ulvik
- Bevital AS, Jonas Lies veg 87, Laboratory building, 5021, Bergen, Norway
| | - Adrian McCann
- Bevital AS, Jonas Lies veg 87, Laboratory building, 5021, Bergen, Norway
| | - Per Magne Ueland
- Bevital AS, Jonas Lies veg 87, Laboratory building, 5021, Bergen, Norway
| | - Klaus Meyer
- Bevital AS, Jonas Lies veg 87, Laboratory building, 5021, Bergen, Norway
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Kozlova VA, Metelskaya VA, Pokrovskaya MS, Efimova IA, Litinskaya OA, Kutsenko VA, Yarovaya EB, Shalnova SA, Drapkina OM. Stability of serum biochemical markers during standard long-term storage and with a single thawing. КАРДИОВАСКУЛЯРНАЯ ТЕРАПИЯ И ПРОФИЛАКТИКА 2020. [DOI: 10.15829/1728-8800-2020-2736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Aim. To study the effect of standard serum long-term storage at -70О C and with a single thawing on the biochemical markers by comparing the results of studies carried out in 2013-2014 and 2020.Material and methods. The material was the blood serum of participants in the ESSE-RF study, which was stored in a specialized biobank from 2013-2014 at -70О C either continuously (n=149) or with a single thawing (n=20). Initially and in 2020, the quantitative determination of serum biochemical parameters was carried out using same equipment and standard techniques.Results. Long-term storage at -70О C led to mild, but significant changes in almost all analyzed parameters: low density lipoprotein cholesterol (LDL-C) and apolipoprotein A1 levels decreased; levels of highdensity lipoprotein cholesterol (HDL-C), triglycerides, apolipoprotein B, glucose, and high-sensitivity C-reactive protein increased. Insulin and thyroid-stimulating hormone levels did not change during storage. The revealed strong positive relationships between the initial concentrations and those measured in 2020 in samples that were stored continuously indicate the relevance of such storage. In samples with single thawing, changes in most parameters were more pronounced.Conclusion. The results of a prospective cohort study aimed at studying the stability of human serum samples during storage indicate the validity of long-term storage at -70О C without thawing. Freeze-thawing cycle of samples (even once) is unacceptable, since it leads to a pronounced LDL-C decrease. Given the fact that it is the LDL-C levels that is the target of lipid-lowering therapy, continuous low-temperature (not >-70О C) storage of blood serum samples is recommended.
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Affiliation(s)
- V. A. Kozlova
- National Medical Research Center for Therapy and Preventive Medicine
| | - V. A. Metelskaya
- National Medical Research Center for Therapy and Preventive Medicine
| | - M. S. Pokrovskaya
- National Medical Research Center for Therapy and Preventive Medicine
| | - I. A. Efimova
- National Medical Research Center for Therapy and Preventive Medicine
| | - O. A. Litinskaya
- National Medical Research Center for Therapy and Preventive Medicine
| | - V. A. Kutsenko
- National Medical Research Center for Therapy and Preventive Medicine
| | - E. B. Yarovaya
- National Medical Research Center for Therapy and Preventive Medicine
| | - S. A. Shalnova
- National Medical Research Center for Therapy and Preventive Medicine
| | - O. M. Drapkina
- National Medical Research Center for Therapy and Preventive Medicine
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QuantiFERON-TB Gold Plus with Chemiluminescence Immunoassay: Do We Need a Higher Cutoff? J Clin Microbiol 2020; 58:JCM.00780-20. [PMID: 32759352 DOI: 10.1128/jcm.00780-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/31/2020] [Indexed: 11/20/2022] Open
Abstract
QuantiFERON-TB Gold Plus (QFT-Plus) is the most widely used interferon gamma release assay (IGRA) for the diagnosis of latent tuberculosis infection (LTBI). The aim of this study was to compare QFT-Plus results by enzyme-linked immunosorbent assay (ELISA) on the SkyLab system with those obtained with chemiluminescence immunoassay (CLIA) on the Liaison XL analyzer. Agreement between the two assays was evaluated on 419 QFT-Plus blood samples and was found to be substantial (75.4%); higher agreement was found for positive (95.4%) and negative (80.4%) results, while most discordances were due to ELISA-indeterminate/CLIA-determinate results. According to Italian Clinical Microbiologist Association recommendations, in samples (n = 79) with a borderline result in ELISA (0.20 to 0.70 IU/ml), CLIA median values statistically increased (from 0.29 to 0.59 IU/ml for TB1 and from 0.32 to 0.60 IU/ml for TB2) but remained in the borderline range. Linear regression analysis indicated a substantial correlation between ELISA and CLIA for antigen tubes TB1 (Pearson's r = 0.8666) and TB2 (Pearson's r = 0.8728), but CLIA produced higher values than ELISA. Receiver operating characteristic (ROC) analysis showed that the optimal cutoff value in CLIA was 0.45 IU/ml for TB1 and 0.46 IU/ml for TB2. In conclusion, automated QFT-Plus with CLIA is comparable to QFT-Plus performed by ELISA. Within the linearity range of the test, CLIA detects higher quantitative values than ELISA, resulting in a higher number of determinate results and the conversion of samples that were close to the cutoff into positive borderline results. A higher cutoff for QFT-CLIA needs to be defined based on clinical diagnostic criteria.
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21
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Quinone-based antibody labeling reagent for enzyme-free chemiluminescent immunoassays. Application to avidin and biotinylated anti-rabbit IgG labeling. Biosens Bioelectron 2020; 160:112215. [DOI: 10.1016/j.bios.2020.112215] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 03/27/2020] [Accepted: 04/13/2020] [Indexed: 12/16/2022]
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Rohlwink UK, Chow FC, Wasserman S, Dian S, Lai RPJ, Chaidir L, Hamers RL, Wilkinson RJ, Boulware DR, Cresswell FV, van Laarhoven A. Standardized approaches for clinical sampling and endpoint ascertainment in tuberculous meningitis studies. Wellcome Open Res 2020; 4:204. [PMID: 32399496 PMCID: PMC7194504 DOI: 10.12688/wellcomeopenres.15497.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2020] [Indexed: 01/12/2023] Open
Abstract
Tuberculous meningitis (TBM), the most severe manifestation of tuberculosis, has poorly understood immunopathology and high mortality and morbidity despite antituberculous therapy. This calls for accelerated clinical and basic science research in this field. As TBM disproportionally affects poorer communities, studies are often performed in resource-limited environments, creating challenges for data collection and harmonisation. Comparison of TBM studies has been hampered by variation in sampling strategies, study design and choice of study endpoints. Based on literature review and expert consensus, this paper provides firstly, practical recommendations to enable thorough diagnostic, pathophysiological and pharmacokinetic studies using clinical samples, and facilitates better data aggregation and comparisons across populations and settings. Secondly, we discuss clinically relevant study endpoints, including neuroimaging, functional outcome, and cause of death, with suggestions of how these could be applied in different designs for future TBM studies.
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Affiliation(s)
- Ursula K Rohlwink
- Division of Neurosurgery, Department of Surgery, Neuroscience Institute, University of Cape Town, Cape Town, 7700, South Africa
| | - Felicia C Chow
- Weill Institute for Neurosciences and Departments of Neurology and Medicine (Infectious Diseases), University of California, San Francisco, USA
| | - Sean Wasserman
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa,Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine and Department of Medicine, University of Cape Town, Observatory, Cape Town, South Africa
| | - Sofiati Dian
- Infectious Disease Research Center, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia,Department of Neurology, Faculty of Medicine, Universitas Padjadjaran/Hasan Sadikin Hospital, Bandung, Indonesia
| | - Rachel PJ Lai
- The Francis Crick Institute, Midland Road, London, NW1 1AT, UK,Department of Infectious Diseases, Imperial College London, London, UK
| | - Lidya Chaidir
- Infectious Disease Research Center, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia,Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Raph L Hamers
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia,Faculty of Medicine, University of Indonesia, Jakarta, Indonesia,Nuffield Department of Medicine, Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, UK
| | - Robert J Wilkinson
- Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine and Department of Medicine, University of Cape Town, Observatory, Cape Town, South Africa,The Francis Crick Institute, Midland Road, London, NW1 1AT, UK,Department of Infectious Diseases, Imperial College London, London, UK
| | | | - Fiona V Cresswell
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK,Infectious Disease Institute, Mulago College of Health Sciences, Kampala, Uganda,MRC-UVRI LSHTM Uganda Research Unit, Entebbe, Uganda
| | - Arjan van Laarhoven
- Department of Internal Medicine and Radboud Center of Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands,
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23
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Rohlwink UK, Chow FC, Wasserman S, Dian S, Lai RPJ, Chaidir L, Hamers RL, Wilkinson RJ, Boulware DR, Cresswell FV, van Laarhoven A. Standardized approaches for clinical sampling and endpoint ascertainment in tuberculous meningitis studies. Wellcome Open Res 2020; 4:204. [PMID: 32399496 PMCID: PMC7194504 DOI: 10.12688/wellcomeopenres.15497.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/26/2019] [Indexed: 12/26/2022] Open
Abstract
Tuberculous meningitis (TBM), the most severe manifestation of tuberculosis, has poorly understood immunopathology and high mortality and morbidity despite antituberculous therapy. This calls for accelerated clinical and basic science research in this field. As TBM disproportionally affects poorer communities, studies are often performed in resource-limited environments, creating challenges for data collection and harmonisation. Comparison of TBM studies has been hampered by variation in sampling strategies, study design and choice of study endpoints. Based on literature review and expert consensus, this paper provides firstly, practical recommendations to enable thorough diagnostic, pathophysiological and pharmacokinetic studies using clinical samples, and facilitates better data aggregation and comparisons across populations and settings. Secondly, we discuss clinically relevant study endpoints, including neuroimaging, functional outcome, and cause of death, with suggestions of how these could be applied in different designs for future TBM studies.
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Affiliation(s)
- Ursula K Rohlwink
- Division of Neurosurgery, Department of Surgery, Neuroscience Institute, University of Cape Town, Cape Town, 7700, South Africa
| | - Felicia C Chow
- Weill Institute for Neurosciences and Departments of Neurology and Medicine (Infectious Diseases), University of California, San Francisco, USA
| | - Sean Wasserman
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa,Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine and Department of Medicine, University of Cape Town, Observatory, Cape Town, South Africa
| | - Sofiati Dian
- Infectious Disease Research Center, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia,Department of Neurology, Faculty of Medicine, Universitas Padjadjaran/Hasan Sadikin Hospital, Bandung, Indonesia
| | - Rachel PJ Lai
- The Francis Crick Institute, Midland Road, London, NW1 1AT, UK,Department of Infectious Diseases, Imperial College London, London, UK
| | - Lidya Chaidir
- Infectious Disease Research Center, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia,Department of Biomedical Sciences, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Raph L Hamers
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia,Faculty of Medicine, University of Indonesia, Jakarta, Indonesia,Nuffield Department of Medicine, Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, UK
| | - Robert J Wilkinson
- Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine and Department of Medicine, University of Cape Town, Observatory, Cape Town, South Africa,The Francis Crick Institute, Midland Road, London, NW1 1AT, UK,Department of Infectious Diseases, Imperial College London, London, UK
| | | | - Fiona V Cresswell
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK,Infectious Disease Institute, Mulago College of Health Sciences, Kampala, Uganda,MRC-UVRI LSHTM Uganda Research Unit, Entebbe, Uganda
| | - Arjan van Laarhoven
- Department of Internal Medicine and Radboud Center of Infectious Diseases (RCI), Radboud University Medical Center, Nijmegen, The Netherlands,
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24
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Brant EB, Kennedy J, Martin-Gill C, Jackson V, Palmer OMP, Callaway CW, Kahn JM, Yealy DM, Angus DC, Seymour CW. Association Between Intravenous Fluid Bolus and Biomarker Trajectory During Prehospital Care. PREHOSP EMERG CARE 2020; 24:196-203. [PMID: 31180262 PMCID: PMC6938563 DOI: 10.1080/10903127.2019.1629134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 05/31/2019] [Accepted: 05/31/2019] [Indexed: 10/26/2022]
Abstract
Background: Patients with acute illness who receive intravenous (IV) fluids prior to hospital arrival may have a lower in-hospital mortality. To better understand whether this is a direct treatment effect or epiphenomenon of downstream care, we tested the association between a prehospital fluid bolus and the change in inflammatory cytokines measured at prehospital and emergency department timepoints in a sample of non-trauma, non-cardiac arrest patients at risk for critical illness. Methods: In a prospective cohort study, we screened 4,013 non-trauma, non-cardiac arrest encounters transported by City of Pittsburgh Emergency Medical Services (EMS) to 2 hospitals from August 2013 to February 2014. In 345 patients, we measured prehospital biomarkers (IL-6, IL-10, and TNF) at 2 time points: the time of prehospital IV access placement by EMS and at ED arrival. We determined the relative change for marker X as: ([XED - XEMS]/XEMS). We determined the risk-adjusted association between prehospital IV fluid bolus and relative change for each marker using multivariable linear regression. Results: Among 345 patients, 88 (26%) received a prehospital IV fluid bolus and 257 (74%) did not. Compared to patients who did not receive prehospital fluids, median prehospital IL-6 was greater initially in subjects receiving a prehospital IV fluid bolus (22.3 [IQR 6.4-113] vs. 11.5 [IQR 5.5-47.6]). Prehospital IL-10 and TNF were similar in both groups (IL-10: 3.5 [IQR 2.2-25.6] vs. 3.0 [IQR 1.9-9.0]; TNF: 7.5 [IQR 6.4-10.4] vs. 6.9 [IQR 6.0-8.3]). After adjustment for demographics, illness severity, and prehospital transport time, we observed a relative decrease in IL-6 at hospital arrival in those receiving a prehospital fluid bolus (adjusted β = -10.0, 95% CI: -19.4, -0.6, p = 0.04), but we did not detect a significant change in IL-10 (p = 0.34) or TNF (p = 0.53). Conclusions: Among non-trauma, non-cardiac arrest patients at risk for critical illness, a prehospital IV fluid bolus was associated with a relative decrease in IL-6, but not IL-10 or TNF.
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Affiliation(s)
- Emily B Brant
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Jason Kennedy
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Christian Martin-Gill
- Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Vanessa Jackson
- Clinical Research, Investigation and Systems Modeling of Acute Illness (CRISMA) Center, Pittsburgh, PA
| | - Octavia M Peck Palmer
- Clinical Research, Investigation and Systems Modeling of Acute Illness (CRISMA) Center, Pittsburgh, PA
| | - Clifton W. Callaway
- Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Jeremy M Kahn
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Clinical Research, Investigation and Systems Modeling of Acute Illness (CRISMA) Center, Pittsburgh, PA
| | - Donald M Yealy
- Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Derek C Angus
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Clinical Research, Investigation and Systems Modeling of Acute Illness (CRISMA) Center, Pittsburgh, PA
| | - Christopher W Seymour
- Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Clinical Research, Investigation and Systems Modeling of Acute Illness (CRISMA) Center, Pittsburgh, PA
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25
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Stability of 12 T-helper cell-associated cytokines in human serum under different pre-analytical conditions. Cytokine 2020; 129:155044. [PMID: 32109722 DOI: 10.1016/j.cyto.2020.155044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 01/16/2020] [Accepted: 02/15/2020] [Indexed: 11/23/2022]
Abstract
Cytokines are soluble and readily analyzed signaling molecules which reveal vital cues about the state of the immune system. As such, they serve in diagnosis and monitoring of immune-related disorders, where strictly controlled handling of the samples including storage and freeze/thawing procedures are required. In basic research and clinical trials, human serum samples can be left for long-term storage before processing. Storage space is commonly limited in scientific laboratories, which require storage of fewer but larger aliquots of patient serum samples. There are also practical limitations to the number of analytes to be processed at the same time. Further, new findings and technological progress might prompt analysis of hitherto unconsidered or undetectable molecules. Repeated freeze/thawing of serum samples is therefore a likely scenario, raising the question of the stability of the measured analytes under such conditions. To address this question, we subjected serum samples with spiked-in T-helper cell associated cytokines to several cycles of freeze/thawing under different conditions, including storage at -20 °C or -80 °C and thawing at 4 °C, 22 °C, and 37 °C, respectively. The concentration of TNF-α, IL-4, IL-17F, and IL-22 decreased after storage at room temperature for 4 h before freezing. Generally, storage at -20 °C resulted in reduced cytokine concentrations. This contrasts storage at -80 °C, which gave stable analyte concentrations; unaffected by repeated freeze/thaw cycles. The study presented here highlights the need for sentinel samples with known cytokine concentrations as internal control for the freeze/thaw process.
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26
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Berkhout LC, l'Ami MJ, Ruwaard J, Hart MH, Heer POD, Bloem K, Nurmohamed MT, van Vollenhoven RF, Boers M, Alvarez DF, Smith CH, Wolbink GJ, Rispens T. Dynamics of circulating TNF during adalimumab treatment using a drug-tolerant TNF assay. Sci Transl Med 2020; 11:11/477/eaat3356. [PMID: 30700574 DOI: 10.1126/scitranslmed.aat3356] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 09/08/2018] [Accepted: 12/19/2018] [Indexed: 12/24/2022]
Abstract
Patients with rheumatoid arthritis (RA) can be successfully treated with tumor necrosis factor (TNF) inhibitors, including the monoclonal antibody adalimumab. Once in remission, a proportion of patients can successfully discontinue treatment, indicating that blocking TNF is no longer required for disease control. To explore the dynamics of circulating TNF during adalimumab treatment, we developed a competition enzyme-linked immunosorbent assay that can quantify TNF in the presence of large amounts of TNF inhibitor, i.e., a "drug-tolerant" assay. In 193 consecutive adalimumab-treated patients with RA, we demonstrated that circulating TNF increased in average of >50-fold upon treatment and reached a stable concentration in time for most patients. A similar increase in TNF was found in 30 healthy volunteers after one dose of adalimumab. This implies that TNF in circulation during anti-TNF treatment is not primarily associated with disease activity. During treatment, TNF was in complex with adalimumab and could be recovered as inactive 3:1 adalimumab-TNF complexes. No quantitative association was found between TNF and adalimumab concentrations. Low TNF concentrations at week 4 were associated with a higher frequency of antidrug antibodies (ADAs) at subsequent time points, less frequent methotrexate use at baseline, and less frequent remission after 52 weeks. Also in healthy volunteers, early low TNF concentrations are associated with ADAs. In conclusion, longitudinal TNF concentrations are mostly stable during adalimumab treatment and may therefore not predict successful treatment discontinuation. However, early low TNF is strongly associated with ADA formation and may be used as timely predictor of nonresponse toward adalimumab treatment.
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Affiliation(s)
- Lea C Berkhout
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands
| | - Merel J l'Ami
- Amsterdam Rheumatology and immunology Center, Reade, 1056 AB Amsterdam, Netherlands
| | - Jill Ruwaard
- Amsterdam Rheumatology and immunology Center, Reade, 1056 AB Amsterdam, Netherlands
| | - Margreet H Hart
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands
| | - Pleuni Ooijevaar-de Heer
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands
| | - Karien Bloem
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands
| | - Michael T Nurmohamed
- Amsterdam Rheumatology and immunology Center, Reade, 1056 AB Amsterdam, Netherlands.,Amsterdam Rheumatology and Immunology Center, Amsterdam UMC, VU University Medical Center, 1081 HV Amsterdam, Netherlands
| | - Ronald F van Vollenhoven
- Amsterdam Rheumatology and immunology Center, Reade, 1056 AB Amsterdam, Netherlands.,Amsterdam Rheumatology and Immunology Center, Amsterdam UMC, VU University Medical Center, 1081 HV Amsterdam, Netherlands.,Amsterdam Rheumatology and Immunology Center, Amsterdam UMC, Academic Medical Center, 1105 AZ Amsterdam, Netherlands
| | - Maarten Boers
- Amsterdam Rheumatology and Immunology Center, Amsterdam UMC, VU University Medical Center, 1081 HV Amsterdam, Netherlands.,Department of Epidemiology and Biostatistics, VU University Medical Center, 1081 HV Amsterdam, Netherlands
| | | | - Catherine H Smith
- St. John's Institute of Dermatology, Division of Genetics and Molecular Medicine, Kings College London, SE1 9RT London, UK
| | - Gerrit J Wolbink
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands.,Amsterdam Rheumatology and immunology Center, Reade, 1056 AB Amsterdam, Netherlands
| | - Theo Rispens
- Department of Immunopathology, Sanquin Research, 1066 CX Amsterdam, Netherlands, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, Netherlands.
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27
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Pum JKW. Evaluating sample stability in the clinical laboratory with the help of linear and non-linear regression analysis. Clin Chem Lab Med 2020; 58:188-196. [PMID: 31702996 DOI: 10.1515/cclm-2019-0596] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 07/11/2019] [Indexed: 11/15/2022]
Abstract
As it is common practice for laboratories to store patient samples for a predefined period, allowing clinicians to request additional tests on previously collected samples, knowledge about sample stability is indispensable for the laboratorian. A common approach to estimating the maximum storage time is to use a discrete study design, measuring the analyte of interest at various time-points and then checking for significant differences with the help of a statistical test, such as Student's t-test, Wilcoxon's test or an analysis of variance (ANOVA) test. Because only discrete time intervals are considered, stability data can just be approximated. Alternatively, a continuous study design, as described by the Clinical and Laboratory Standards Institute (CLSI) for performing stability experiments for in vitro diagnostic reagents, can also be adopted by the clinical laboratory to evaluate the stability of biological samples. The major advantage of this approach is that it allows laboratories to define individual stability limits for different medical situations and offers more flexibility when choosing time-points for measurements. The intent of this paper is to demonstrate the evaluation of sample stability in the clinical laboratory with a continuous study design implemented with linear or non-linear regression analysis. Appropriate statistical modeling and acceptance criteria are presented, stability functions are described briefly, and checking the overall validity of the results is discussed.
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Affiliation(s)
- Joachim K W Pum
- Bioscientia Institut für Medizinische Diagnostik GmbH, MVZ Jena, Orlaweg 2, Jena 07743, Germany
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28
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Optimization of Saliva Collection and Immunochromatographic Detection of Salivary Pepsin for Point-of-Care Testing of Laryngopharyngeal Reflux. SENSORS 2020; 20:s20010325. [PMID: 31935973 PMCID: PMC6982828 DOI: 10.3390/s20010325] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 12/27/2019] [Accepted: 01/03/2020] [Indexed: 12/16/2022]
Abstract
Salivary pepsin is a promising marker for the non-invasive diagnosis of laryngopharyngeal reflux (LPR). For reliable results regarding pepsin in saliva, it is critical to standardize the collection, storage, and pre-processing methods. In this study, we optimized the saliva collection protocols, including storage conditions, i.e., solution, temperature, and time, and the pre-processing filter for pepsin. Moreover, we prepared a simple immunochromatographic strip for the rapid detection of pepsin and evaluated its sensing performance. As a result, we selected a polypropylene (PP) filter as the pre-processing filter for salivary pepsin in low resource settings, such as those where point of care testing (POCT) is conducted. This filter showed a similar efficiency to the centrifuge (standard method). Finally, we detected the pepsin using gold nanoparticles conjugated with monoclonal pepsin antibody. Under optimized conditions, the lower limit of detection for pepsin test strips was determined as 0.01 μg/mL. Furthermore, we successfully detected the salivary pepsin in real saliva samples of LPR patients, which were pre-processed by the PP filter. Therefore, we expect that our saliva collection protocol and pepsin immunochromatographic strip can be utilized as useful tools for a non-invasive diagnosis/screening of LPR in POCT.
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29
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Jonesco DS, Hassager C, Frydland M, Kjærgaard J, Karsdal M, Henriksen K. A caspase-6-cleaved fragment of Glial Fibrillary Acidic Protein as a potential serological biomarker of CNS injury after cardiac arrest. PLoS One 2019; 14:e0224633. [PMID: 31693684 PMCID: PMC6834260 DOI: 10.1371/journal.pone.0224633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 10/17/2019] [Indexed: 12/31/2022] Open
Abstract
Blood levels of Glial Fibrillary Acidic protein (GFAP) reflect processes associated with different types of CNS injury. Evidence suggests that GFAP is cleaved by caspases during CNS injury, hence positioning GFAP fragments as potential biomarkers of injury-associated processes. We set out to develop an assay detecting the neo-epitope generated by caspase-6 cleavage of GFAP (GFAP-C6), and to assess the ability of GFAP-C6 to reflect pathological processes in patients suffering a cardiac arrest and subsequent global cerebral ischemia. Anti-GFAP-C6 antibodies recognized their specific target sequence, and dilution and spike recoveries in serum were within limits of ±20% reflecting high precision and accuracy of measurements. Intra- and inter-assay CVs were below limits of 10% and 15%, respectively. Serological levels of GFAP-C6 were significantly elevated 72 hours after CA (Mean±SD) (20.39±10.59 ng/mL) compared to time of admission (17.79±10.77 ng/mL, p<0.0001), 24 hours (17.40±7.99 ng/mL, p<0.0001) and 48 hours (17.87±8.56 ng/mL, p<0.0001) after CA, but were not related to neurological outcome at day 180. GFAP-C6 levels at admission, 24, 48, and 72 hours after cardiac arrest correlated with two proteolytic fragments of tau, tau-A (r = 0.30, r = 0.40, r = 0.50, r = 0.53, p < 0.0001) and tau-C (r = 54, r = 0.48, r = 0.55, r = 0.54, p < 0.0001), respectively. GFAP-C6 levels did not correlate with other markers of CNS damage; total tau, NSE and S100B. In conclusion, we developed the first assay detecting a caspase-6 cleaved fragment of GFAP in blood. Increased levels at 72 hours after cardiac arrest as well as moderate correlations between GFAP-C6 and two other blood biomarkers of neurodegeneration suggest the ability of GFAP-C6 to reflect pathological processes of the injured brain. Investigations into the potential of GFAP-C6 in other types of CNS injury are warranted.
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Affiliation(s)
- Ditte S. Jonesco
- Biomarkers & Research, Nordic Bioscience, Herlev, Denmark
- * E-mail:
| | - Christian Hassager
- Department of Cardiology B, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Martin Frydland
- Department of Cardiology B, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Jesper Kjærgaard
- Department of Cardiology B, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Morten Karsdal
- Biomarkers & Research, Nordic Bioscience, Herlev, Denmark
| | - Kim Henriksen
- Biomarkers & Research, Nordic Bioscience, Herlev, Denmark
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30
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Xu W, Puligandla M, Manola J, Bullock AJ, Tamasauskas D, McDermott DF, Atkins MB, Haas NB, Flaherty K, Uzzo RG, Dutcher JP, DiPaola RS, Bhatt RS. Angiogenic Factor and Cytokine Analysis among Patients Treated with Adjuvant VEGFR TKIs in Resected Renal Cell Carcinoma. Clin Cancer Res 2019; 25:6098-6106. [PMID: 31471309 DOI: 10.1158/1078-0432.ccr-19-0818] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 06/06/2019] [Accepted: 07/09/2019] [Indexed: 12/30/2022]
Abstract
PURPOSE The use of VEGFR TKIs for the adjuvant treatment of renal cell carcinoma (RCC) remains controversial. We investigated the effects of adjuvant VEGFR TKIs on circulating cytokines in the ECOG-ACRIN 2805 (ASSURE) trial. EXPERIMENTAL DESIGN Patients with resected high-risk RCC were randomized to sunitinib, sorafenib, or placebo. Plasma from 413 patients was analyzed from post-nephrectomy baseline, 4 weeks, and 6 weeks after treatment initiation. Mixed effects and Cox proportional hazards models were used to test for changes in circulating cytokines and associations between disease-free survival (DFS) and cytokine levels. RESULTS VEGF and PlGF increased after 4 weeks on sunitinib or sorafenib (P < 0.0001 for both) and returned to baseline at 6 weeks on sunitinib (corresponding to the break in the sunitinib schedule) but not sorafenib (which was administered continuously). sFLT-1 decreased after 4 weeks on sunitinib and 6 weeks on sorafenib (P < 0.0001). sVEGFR-2 decreased after both 4 and 6 weeks of treatment on sunitinib or sorafenib (P < 0.0001). Patients receiving placebo had no significant changes in cytokine levels. CXCL10 was elevated at 4 and 6 weeks on sunitinib and sorafenib but not on placebo. Higher baseline CXCL10 was associated with worse DFS (HR 1.41 per log increase in CXCL10, Bonferroni-adjusted P = 0.003). This remained significant after adjustment for T-stage, Fuhrman grade, and ECOG performance status. CONCLUSIONS Among patients treated with adjuvant VEGFR TKIs for RCC, drug-host interactions mediate changes in circulating cytokines. Elevated baseline CXCL10 was associated with worse DFS. Studies to understand functional consequences of these changes are under way.
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Affiliation(s)
- Wenxin Xu
- Beth Israel Deaconess Medical Center, Boston, Massachusetts
| | - Maneka Puligandla
- Dana-Farber Cancer Institute, ECOG-ACRIN Biostatistics Center, Boston, Massachusetts
| | - Judith Manola
- Dana-Farber Cancer Institute, ECOG-ACRIN Biostatistics Center, Boston, Massachusetts
| | | | | | | | - Michael B Atkins
- MedStar Georgetown University Hospital, Washington, District of Columbia
| | - Naomi B Haas
- Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | | | | | | | | | - Rupal S Bhatt
- Beth Israel Deaconess Medical Center, Boston, Massachusetts.
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31
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The Effect of Anticoagulants, Temperature, and Time on the Human Plasma Metabolome and Lipidome from Healthy Donors as Determined by Liquid Chromatography-Mass Spectrometry. Biomolecules 2019; 9:biom9050200. [PMID: 31126114 PMCID: PMC6571950 DOI: 10.3390/biom9050200] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/14/2019] [Accepted: 05/21/2019] [Indexed: 12/27/2022] Open
Abstract
Liquid-chromatography mass spectrometry is commonly used to identify and quantify metabolites from biological samples to gain insight into human physiology and pathology. Metabolites and their abundance in biological samples are labile and sensitive to variations in collection conditions, handling and processing. Variations in sample handling could influence metabolite levels in ways not related to biology, ultimately leading to the misinterpretation of results. For example, anticoagulants and preservatives modulate enzyme activity and metabolite oxidization. Temperature may alter both enzymatic and non-enzymatic chemistry. The potential for variation induced by collection conditions is particularly important when samples are collected in remote locations without immediate access to specimen processing. Data are needed regarding the variation introduced by clinical sample collection processes to avoid introducing artifact biases. In this study, we used metabolomics and lipidomics approaches paired with univariate and multivariate statistical analyses to assess the effects of anticoagulant, temperature, and time on healthy human plasma samples collected to provide guidelines on sample collection, handling, and processing for vaccinology. Principal component analyses demonstrated clustering by sample collection procedure and that anticoagulant type had the greatest effect on sample metabolite variation. Lipids such as glycerophospholipids, acylcarnitines, sphingolipids, diacylglycerols, triacylglycerols, and cholesteryl esters are significantly affected by anticoagulant type as are amino acids such as aspartate, histidine, and glutamine. Most plasma metabolites and lipids were unaffected by storage time and temperature. Based on this study, we recommend samples be collected using a single anticoagulant (preferably EDTA) with sample processing at <24 h at 4 °C.
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Pasternak JA, MacPhee DJ, Harding JCS. Development and application of a porcine specific ELISA for the quantification of soluble CD163. Vet Immunol Immunopathol 2019; 210:60-67. [PMID: 30947982 DOI: 10.1016/j.vetimm.2019.03.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/22/2019] [Accepted: 03/23/2019] [Indexed: 01/07/2023]
Abstract
The cellular marker CD163 is a type 1 transmembrane scavenger protein found either on the surface of antigen-presenting cells or in a soluble form (sCD163), released in response to inflammation. Despite an obligatory role in porcine reproductive and respiratory virus (PRRSV) infection, information on sCD163 as a biomarker of disease outcome in swine remains limited. In the present study, we developed a sandwich ELISA using an anti-bovine CD163 antibody, LND68A, in conjunction with the porcine specific 2A10/11 antibody. The ELISA demonstrated that CD163 shedding from porcine alveolar macrophages increased following in vitro exposure to lipopolysaccharide or PRRSV-2 strain NVSL 97-7895. Evaluation of serum sCD163 in healthy feeder pigs identified a significant age effect with concentration rising after birth to a peak at day 19 (P < 0.05) followed by a sharp decline to a minimal level of detection at 9 weeks of age (P < 0.05). Healthy sows showed substantial variation but no significant change in average concentration between early and late lactation. The serum concentration of sCD163 from pigs with homozygous gene edits disrupting translation of the CD163 protein was below the threshold of detection. However, when reformatted as a competitive ELISA the assay identified an interfering substance consistent with the release of a truncated form of the CD163 protein in sera from gene edited animals. With sCD163 shown to be both dynamic and responsive, the described ELISA represents a novel tool for investigation of this molecule as a potential biomarker of disease response in the pig.
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Affiliation(s)
- J Alex Pasternak
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, 52 Campus Dr., University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada.
| | - Daniel J MacPhee
- Department Veterinary Biomedical Sciences, Western College of Veterinary Medicine, 52 Campus Dr., University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - John C S Harding
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, 52 Campus Dr., University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
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Liu KYP, Lu XJD, Zhu YS, Le N, Kim H, Poh CF. Plasma-Derived Inflammatory Proteins Predict Oral Squamous Cell Carcinoma. Front Oncol 2018; 8:585. [PMID: 30564558 PMCID: PMC6288174 DOI: 10.3389/fonc.2018.00585] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 11/19/2018] [Indexed: 12/20/2022] Open
Abstract
Oral squamous cell carcinoma (OSCC) is a major concern with high morbidity and mortality worldwide, even with the current knowledge and the advancement in treatment. OSCCs diagnosed at late-stage often require wide-excision with or without neck dissection, radiotherapy, or chemotherapy. When deemed successful, treatment often results in diminished quality of life, impaired function, and disfigurement. Strategies for early detection are urgently needed for patients afflicted with this disease. Inflammatory protein plasma biomarkers have shown to be potential tests for early detection and disease monitoring in several cancers. There has been no study on inflammation-related plasma biomarkers in OSCC. The objectives of the study were to use a multiplex approach to screen plasma-derived biomarkers and to examine the association of measurable proteins with OSCC. A total of 260 plasma samples (210 OSCC and 50 normal controls) were collected to measure for concentration of inflammatory related biomarkers using electrochemiluminescence multiplex assay. After screening of 82 potential biomarkers of the first 160 OSCC, 16 cytokines, chemokines, and growth factors were identified and verified in the second set of samples containing 50 OSCC and 50 normal. After adjustment of age and batch effects, the adjusted differential expression analysis showed that the OSCCs were markedly lower in 14 biomarkers and significantly higher level of interleukin 1 receptor antagonist (IL1Ra). By performing unsupervised clustering analysis, we observed distinctive groups of normal and two subgroups of OSCC. Linear regression of IL2, IL1Ra, and macrophage inhibitory factor (MIF) showed high accuracy in classifying OSCC with sensitivity of 0.96 and specificity of 0.92. In conclusion, this is the first paper to identify potential inflammatory plasma protein biomarkers of patients with OSCC. With further validation, the set of biomarkers can potentially be used to assist in early detection of OSCC when the disease is localized and in more treatable stage.
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Affiliation(s)
- Kelly Yi Ping Liu
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada.,Department of Integrative Oncology, British Columbia Cancer Research Centre, Vancouver, BC, Canada
| | - Xian Jun David Lu
- Department of Integrative Oncology, British Columbia Cancer Research Centre, Vancouver, BC, Canada
| | - Yuqi Sarah Zhu
- Department of Integrative Oncology, British Columbia Cancer Research Centre, Vancouver, BC, Canada
| | - Nhu Le
- Department of Cancer Control Research, British Columbia Cancer Research Centre, Vancouver, BC, Canada
| | - Hugh Kim
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada.,Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada.,Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada
| | - Catherine F Poh
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada.,Department of Integrative Oncology, British Columbia Cancer Research Centre, Vancouver, BC, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
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Shen Q, Björkesten J, Galli J, Ekman D, Broberg J, Nordberg N, Tillander A, Kamali-Moghaddam M, Tybring G, Landegren U. Strong impact on plasma protein profiles by precentrifugation delay but not by repeated freeze-thaw cycles, as analyzed using multiplex proximity extension assays. Clin Chem Lab Med 2018; 56:582-594. [PMID: 29040064 DOI: 10.1515/cclm-2017-0648] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 09/11/2017] [Indexed: 01/06/2023]
Abstract
Background A number of factors regarding blood collection, handling and storage may affect sample quality. The purpose of this study was to assess the impact on plasma protein profiles by delayed centrifugation and plasma separation and multiple freeze-thaw cycles. Methods Blood samples drawn from 16 healthy individuals were collected into ethylenediaminetetraacetic acid tubes and kept either at 4 °C or 22 °C for 1-36 h prior to centrifugation. Plasma samples prepared 1 h after venipuncture were also subjected to two to eight cycles of freezing at -80 °C and thawing at 22 °C. Multiplex proximity extension assay, an antibody-based protein assay, was used to investigate the influence on plasma proteins. Results Up to 36 h delay before blood centrifugation resulted in significant increases of 16 and 40 out of 139 detectable proteins in samples kept at 4 °C or 22 °C, respectively. Some increases became noticeable after 8 h delay at 4 °C but already after 1 h at 22 °C. For samples stored at 4 °C, epidermal growth factor (EGF), NF-kappa-B essential modulator, SRC, interleukin 16 and CD6 increased the most, whereas the five most significantly increased proteins after storage at 22 °C were CD40 antigen ligand (CD40-L), EGF, platelet-derived growth factor subunit B, C-X-C motif chemokine ligand 5 and matrix metallopeptidase 1 (MMP1). Only matrix metallopeptidase 7 (MMP7) decreased significantly over time and only after storage at 22 °C. No protein levels were found to be significantly affected by up to eight freeze-thaw cycles. Conclusions Plasma should be prepared from blood after a limited precentrifugation delay at a refrigerated temperature. By contrast, the influence by several freeze-thaw cycles on detectable protein levels in plasma was negligible.
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Affiliation(s)
- Qiujin Shen
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University,Uppsala, Sweden
| | - Johan Björkesten
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University,Uppsala, Sweden
| | - Joakim Galli
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University,Uppsala, Sweden
| | | | | | | | - Annika Tillander
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Masood Kamali-Moghaddam
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University,Uppsala, Sweden
| | - Gunnel Tybring
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Ulf Landegren
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University,Uppsala, Sweden
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Han Q, Li S, Fu B, Liu D, Wu M, Yang X, Cai G, Liu Z, Chen X, Zhu H. Stability of important antibodies for kidney disease: pre-analytic methodological considerations. PeerJ 2018; 6:e5178. [PMID: 30013843 PMCID: PMC6042478 DOI: 10.7717/peerj.5178] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 06/18/2018] [Indexed: 11/20/2022] Open
Abstract
Background The importance of circulating antibodies as biomarkers of kidney disease has recently been recognized. However, no study has systematically described the methodology of sample preparation and storage regarding antibodies as biomarkers of kidney disease. It remains unknown whether repetitive freeze-thaw cycles, physical disturbances, storage at different temperatures or for different periods of time, or haemolytic or turbid serum samples affect antibody measurements. The aim of this study was to investigate the stabilities of antibodies associated with kidney disease in serum samples under various relevant clinical and research conditions. Methods We stored serum samples in the following different conditions: repetitive freeze-thaw cycles (1, 6 or 12 times), long-term storage (7 or 12 months at -80 °C), physical disturbance (1 or 8 h), and storage at 4 °C (1, 3 or 6 weeks) and room temperature (1 or 7 days). The stabilities of the anti-phospholipase A2 receptor (anti-PLA2R), anti-glomerular basement membrane, anti-myeloperoxidase and anti-proteinase 3 antibodies were evaluated with enzyme-linked immunosorbent assays (ELISA). Results We found that repetitive freeze-thaw cycles did not have a significant effect on the stabilities of the abovementioned antibodies in clear serum samples. The ELISA readings of haemolytic and turbid serum samples tended to increase and decrease, respectively. Neither long-term storage at -80 °C nor physical disturbance had a significant effect on anti-PLA2R antibody stability in sealed serum samples. The concentrations of most of these antibodies increased in unsealed serum samples that were stored at 4 °C for more than 6 weeks or at room temperature for more than 7 days. Discussion Our findings revealed that the abovementioned circulating antibodies that are used as biomarkers for kidney disease had stable physicochemical properties, structures and immunoreactivities such that they were not influenced by repetitive freeze-thaw cycles, physical disturbances or long-term storage at -80 °C. However, the ELISA readings tended to change for haemolytic, turbid and unsealed serum samples.
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Affiliation(s)
- Qiuxia Han
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China.,Department of Nephrology of Zhenghou University, The First Affiliated Hospital of Zhengzhou University, Research Institute of Nephrology of Zhengzhou University, Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, China
| | - Songyan Li
- Department of General Surgery, Chinese PLA General Hospital, Beijing, China
| | - Bo Fu
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China
| | - Dongwei Liu
- Department of Nephrology of Zhenghou University, The First Affiliated Hospital of Zhengzhou University, Research Institute of Nephrology of Zhengzhou University, Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, China
| | - Maoqing Wu
- Center for Translational Science, Children's National Medical Center, Washington DC, USA
| | - Xiaoli Yang
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China
| | - Guangyan Cai
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China
| | - Zhangsuo Liu
- Department of Nephrology of Zhenghou University, The First Affiliated Hospital of Zhengzhou University, Research Institute of Nephrology of Zhengzhou University, Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, China
| | - Xiangmei Chen
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China
| | - Hanyu Zhu
- Department of Nephrology, Chinese PLA General Hospital, Chinese PLA Institute of Nephrology, State Key Laboratory of Kidney Diseases, National Clinical Research Center for Kidney Diseases, Beijing Key Laboratory of Kidney Disease, Beijing, China
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Anderson CE, Hamm LL, Batuman G, Kumbala DR, Chen CS, Kallu SG, Siriki R, Gadde S, Kleinpeter MA, Krane NK, Simon EE, He J, Chen J. The association of angiogenic factors and chronic kidney disease. BMC Nephrol 2018; 19:117. [PMID: 29783932 PMCID: PMC5963107 DOI: 10.1186/s12882-018-0909-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 04/27/2018] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND There are limited data on the associations of circulating angiogenic factors with chronic kidney disease (CKD). We investigate the associations of circulating vascular endothelial growth factor (VEGF)-A, angiopoietin-1, angiopoietin-1/VEGF-A ratio, VEGF receptor 1 (VEGFR-1), VEGFR-2, and pentraxin-3 with CKD. METHODS We recruited 201 patients with CKD and 201 community controls without CKD from the greater New Orleans area. CKD was defined as estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73 m2 or presence of albuminuria. Multivariable quantile and logistic regression models were used to examine the relationship between angiogenesis-related factors and CKD adjusting for confounding factors. RESULTS After adjusting for covariables including traditional cardiovascular disease (CVD) risk factors, C-reactive protein, and history of CVD, the medians (interquartile range) were 133.08 (90.39, 204.15) in patients with CKD vs. 114.17 (72.45, 170.32) pg/mL in controls without CKD (p = 0.002 for group difference) for VEGF-A; 3951.2 (2471.9, 6656.6) vs. 4270.5 (2763.7, 6537.2) pg/mL (p = 0.70) for angiopoietin-1; 25.87 (18.09, 47.90) vs. 36.55 (25.71, 61.10) (p = 0.0001) for angiopoietin-1/VEGF-A ratio; 147.81 (122.94, 168.79) vs. 144.16 (123.74, 168.05) ng/mL (p = 0.25) for VEGFR-1; 26.20 (22.67, 29.92) vs. 26.28 (23.10, 29.69) ng/mL (p = 0.31) for VEGFR-2; and 1.01 (0.79, 1.49)vs. 0.89 (0.58, 1.18) ng/mL (p = 0.01) for pentraxin-3, respectively. In addition, an elevated VEGF-A level and decreased angiopoietin-1/VEGF-A ratio were associated with increased odds of CKD. CONCLUSIONS These data indicate that plasma VEGF-A and pentraxin-3 levels were increased and the angiopoietin-1/VEGF-A ratio was decreased in patients with CKD. Future prospective studies are warranted to examine whether angiogenic factors play a role in progression of CKD.
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Affiliation(s)
- Christopher E. Anderson
- 0000 0001 2217 8588grid.265219.bDepartment of Epidemiology, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street, room 1504, New Orleans, LA 70112 USA
| | - L. Lee Hamm
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA ,0000 0001 2217 8588grid.265219.bTulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA USA
| | - Gem Batuman
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Damodar R. Kumbala
- 0000 0004 0608 1972grid.240416.5Department of Nephrology, Ochsner Health System, Ochsner Medical Center, 1514 Jefferson Highway, New Orleans, LA 70121 USA
| | - Chung-Shiuan Chen
- 0000 0001 2217 8588grid.265219.bDepartment of Epidemiology, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street, room 1504, New Orleans, LA 70112 USA
| | - Swapna G. Kallu
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Ravi Siriki
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Shilpa Gadde
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Myra A. Kleinpeter
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - N. Kevin Krane
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Eric E. Simon
- 0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA
| | - Jiang He
- 0000 0001 2217 8588grid.265219.bDepartment of Epidemiology, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street, room 1504, New Orleans, LA 70112 USA ,0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA ,0000 0001 2217 8588grid.265219.bTulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA USA
| | - Jing Chen
- 0000 0001 2217 8588grid.265219.bDepartment of Epidemiology, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street, room 1504, New Orleans, LA 70112 USA ,0000 0001 2217 8588grid.265219.bDepartment of Medicine, Tulane University School of Medicine, 1430 Tulane Avenue SL45, New Orleans, LA 70112 USA ,0000 0001 2217 8588grid.265219.bTulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA USA
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Hegemann A, Pardal S, Matson KD. Indices of immune function used by ecologists are mostly unaffected by repeated freeze-thaw cycles and methodological deviations. Front Zool 2017; 14:43. [PMID: 28883887 PMCID: PMC5580329 DOI: 10.1186/s12983-017-0226-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 08/15/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Over the past couple of decades, measuring immunological parameters has become widespread in studies of ecology and evolution. A combination of different immunological indices is useful for quantifying different parts of the immune system and comprehensively assessing immune function. Running multiple immune assays usually requires samples to be repeatedly thawed and re-frozen. There is some evidence that repeated freezing and thawing can affect assay results, but this has never been comprehensively studied in some common ecological immunology assays. We tested the effect of multiple (1, 2, 3, 4, 5, 10) freeze-thaw cycles on the results of four commonly used immunological assays: haemolysis-haemagglutination titres, haptoglobin concentration, bacterial killing capacity and total immunoglobulins (IgY). We tested five different bird species from four different bird orders (Passeriformes, Columbiformes, Charadriiformes and Galliformes), and we included both captive and free-living individuals. In addition, we tested for haptoglobin concentrations and the haemolysis-haemagglutination assay if re-analysing samples 1 year apart led to different results. For the haemolysis-haemagglutination assay we also tested two different sources of rabbit blood, and we compared untreated microtitre plates with plates that were "blocked" to prevent nonspecific interactions between the plate and assay reagents. RESULTS Repeated freezing and thawing of plasma had no effect on lysis titres, haptoglobin concentrations, bacterial killing capacity, or total immunoglobulin levels. Agglutination titres were unaffected by up to five cycles but were lower after ten freeze-thaw cycles. For the haemolysis-haemagglutination assay and haptoglobin concentrations, re-analysing samples 1 year apart yielded highly correlated data. For the haemolysis-haemagglutination assay, the source of rabbit blood did not influence the results, and the untreated vs. blocked plates differed slightly overall, but at the individual level assay results were highly correlated. Using different rabbit blood sources or different types of microtitre plates yielded highly correlated data. CONCLUSIONS Our data suggest that repeated freeze-thaw cycles do not impair assay results to the point of influencing ecological or evolutionary conclusions. Plasma samples can be safely stored in one tube and thawed repeatedly for different assays. Nevertheless, we recommend consistent treatment of samples in terms of freeze-thaw cycles or other laboratory treatments to minimize the potential for introducing a systematic bias.
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Affiliation(s)
- Arne Hegemann
- Department of Biology, Lund University, Ecology Building, SE-223 62 Lund, Sweden
| | - Sara Pardal
- MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
| | - Kevin D Matson
- Resource Ecology Group, Environmental Sciences Department, Wageningen University, 6700 AA Wageningen, The Netherlands
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Lombardi G, Sansoni V, Banfi G. Measuring myokines with cardiovascular functions: pre-analytical variables affecting the analytical output. ANNALS OF TRANSLATIONAL MEDICINE 2017; 5:299. [PMID: 28856139 PMCID: PMC5555982 DOI: 10.21037/atm.2017.07.11] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 06/28/2017] [Indexed: 12/30/2022]
Abstract
In the last few years, a growing number of molecules have been associated to an endocrine function of the skeletal muscle. Circulating myokine levels, in turn, have been associated with several pathophysiological conditions including the cardiovascular ones. However, data from different studies are often not completely comparable or even discordant. This would be due, at least in part, to the whole set of situations related to the preparation of the patient prior to blood sampling, blood sampling procedure, processing and/or store. This entire process constitutes the pre-analytical phase. The importance of the pre-analytical phase is often not considered. However, in routine diagnostics, the 70% of the errors are in this phase. Moreover, errors during the pre-analytical phase are carried over in the analytical phase and affects the final output. In research, for example, when samples are collected over a long time and by different laboratories, a standardized procedure for sample collecting and the correct procedure for sample storage are acknowledged. In this review, we discuss the pre-analytical variables potentially affecting the measurement of myokines with cardiovascular functions.
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Affiliation(s)
- Giovanni Lombardi
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
| | - Veronica Sansoni
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
| | - Giuseppe Banfi
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
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Goodfellow N, Morlet J, Singh S, Sabokbar A, Hutchings A, Sharma V, Vaskova J, Masters S, Zarei A, Luqmani R. Is vascular endothelial growth factor a useful biomarker in giant cell arteritis? RMD Open 2017; 3:e000353. [PMID: 28405470 PMCID: PMC5372063 DOI: 10.1136/rmdopen-2016-000353] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/21/2016] [Accepted: 01/03/2017] [Indexed: 11/24/2022] Open
Abstract
Objectives To assess the performance of circulating vascular endothelial growth factor (VEGF) levels as a tool for diagnosing giant cell arteritis (GCA) in a cohort of patients referred for assessment of suspected GCA. Methods We selected 298 patients recruited to the multicentre study Temporal Artery Biopsy versus Ultrasound in diagnosis of suspected GCA (TABUL). In a random subset of 26 biopsy-proven GCA cases and 26 controls, serum from weeks 0, 2 and 26 was analysed for VEGF concentration using ELISA. VEGF concentration at week 0 was used to generate a receiver-operating characteristic curve and thereby identify a cut-off for an abnormal result which was used to analyse the full patient cohort. Sections of paraffin-embedded temporal artery were stained by immunohistochemistry for VEGF. Results The mean (95% CI) VEGF concentration at week 0 was 873 pg/mL (631 to 1110) in 26 patients versus 476 pg/mL (328 to 625) in 26 controls (p=0.017). This difference was not observed at any other time point. The optimal cut-off of 713 pg/mL was applied to the whole patient cohort (n=298), yielding sensitivity of 32% and specificity of 85%. This was not improved by combination with any clinical parameters. When patients with biopsy-proven GCA were compared with controls, sensitivity was 58% and specificity remained 85%. Sections of biopsy from biopsy-positive GCA showed intense staining in the adventitia which was not seen in controls. Conclusions Serum VEGF concentration predicts biopsy positivity but is not useful for differentiating clinical cases of GCA from controls. Further studies into VEGF as a prognostic marker and therapeutic target are warranted. Trial registration number NCT00974883; Post-results.
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Affiliation(s)
- Nicola Goodfellow
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | - Julien Morlet
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | - Surjeet Singh
- Nuffield Department of Surgical Sciences , University of Oxford , Oxford , UK
| | - Afsie Sabokbar
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | | | - Vanshika Sharma
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | - Jana Vaskova
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | - Shauna Masters
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
| | - Allahdad Zarei
- Botnar Research Centre, University of Oxford, Oxford, UK
| | - Raashid Luqmani
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences , University of Oxford , Oxford , UK
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Kennedy OJ, Parkes J, Tanwar S, Trembling PM, Rosenberg WM. The Enhanced Liver Fibrosis (ELF) Panel: Analyte Stability Under Common Sample Storage Conditions Used in Clinical Practice. ACTA ACUST UNITED AC 2017; 1:720-728. [DOI: 10.1373/jalm.2016.022806] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/03/2017] [Indexed: 11/06/2022]
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Lee JE, Lee JH, Hong M, Park SK, Yu JI, Shin SY, Kim SY. Instability of Plasma and Serum Progastrin-Releasing Peptide During Repeated Freezing and Thawing. Osong Public Health Res Perspect 2016; 7:351-355. [PMID: 28053839 PMCID: PMC5194227 DOI: 10.1016/j.phrp.2016.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 11/10/2016] [Indexed: 12/04/2022] Open
Abstract
Objectives Progastrin-releasing peptide (proGRP) is a promising biomarker for small cell lung cancer. However, not much is known about how sample processing and storage conditions affect the stability of proGRP. Here, we examined the effects of repeated freeze–thaw cycles on the stability of proGRP in plasma and serum. Methods Concentrations of proGRP were measured in plasma and serum samples exposed to two, three, or four freeze–thaw cycles and these were compared with values of corresponding samples exposed to one cycle (baseline). We also performed the area under the receiver-operating-characteristic curve (AUC) analysis to determine whether the differences of proGRP concentrations between each paired plasma and serum sample (ΔproGRP) can be used for identifying the samples that have been exposed to multiple freeze–thaw cycles. Results Concentrations of proGRP gradually decreased in both plasma and serum samples with increasing numbers of freeze–thaw cycles. Reduction rates of proGRP concentrations were greater in serum than in plasma samples and serum proGRP levels declined with statistical significance (p < 0.001) up to 10.1% after four freeze–thaw cycles. The ΔproGRP measurement showed fair accuracy (AUC = 0.741) for identifying samples that had been through four freeze–thaw cycles. The sensitivity was 82.8% and specificity was 62.1% at an optimal cut-off point of > 4.9. Conclusion Our study shows that the stability of circulating proGRP is affected in both plasma and serum samples by repeated freezing and thawing. We also show that ΔproGRP could be used for identifying paired plasma and serum samples subjected to multiple freeze–thaw cycles.
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Affiliation(s)
- Jae-Eun Lee
- National Biobank of Korea, Center for Genome Sciences, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea
| | - Jin-Hyun Lee
- Department of Laboratory Medicine, Pusan National University School of Medicine, Busan, Korea
| | - Maria Hong
- National Biobank of Korea, Center for Genome Sciences, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea
| | - Seul-Ki Park
- National Biobank of Korea, Center for Genome Sciences, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea
| | - Ji-In Yu
- National Biobank of Korea, Center for Genome Sciences, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea
| | - So-Youn Shin
- National Biobank of Korea, Center for Genome Sciences, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea
| | - Shine Young Kim
- Department of Laboratory Medicine, Pusan National University School of Medicine, Busan, Korea
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Plasma Protein Timings: Relative Contributions of Storage Time, Donor Age and Donation Season. EBioMedicine 2016; 12:32-33. [PMID: 27742227 PMCID: PMC5078615 DOI: 10.1016/j.ebiom.2016.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 10/04/2016] [Indexed: 11/23/2022] Open
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Enroth S, Hallmans G, Grankvist K, Gyllensten U. Effects of Long-Term Storage Time and Original Sampling Month on Biobank Plasma Protein Concentrations. EBioMedicine 2016; 12:309-314. [PMID: 27596149 PMCID: PMC5078583 DOI: 10.1016/j.ebiom.2016.08.038] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/19/2016] [Accepted: 08/24/2016] [Indexed: 01/17/2023] Open
Abstract
The quality of clinical biobank samples is crucial to their value for life sciences research. A number of factors related to the collection and storage of samples may affect the biomolecular composition. We have studied the effect of long-time freezer storage, chronological age at sampling, season and month of the year and on the abundance levels of 108 proteins in 380 plasma samples collected from 106 Swedish women. Storage time affected 18 proteins and explained 4.8–34.9% of the observed variance. Chronological age at sample collection after adjustment for storage-time affected 70 proteins and explained 1.1–33.5% of the variance. Seasonal variation had an effect on 15 proteins and month (number of sun hours) affected 36 proteins and explained up to 4.5% of the variance after adjustment for storage-time and age. The results show that freezer storage time and collection date (month and season) exerted similar effect sizes as age on the protein abundance levels. This implies that information on the sample handling history, in particular storage time, should be regarded as equally prominent covariates as age or gender and need to be included in epidemiological studies involving protein levels. Storage time explains up to 35 % of plasma protein concentration variation in frozen biobank samples from healthy women. Storage time exert similar effect sizes as individual age and should be included as a covariate in epidemiological studies.
One basic requirement of life science research is the quality of samples. Proper handling and rigorous biobanking of clinical samples is crucial for collection of samples for rare diseases, for monitoring individual variation in longitudinal studies and for prospective studies of biomarkers and risk of developing for instance cardiovascular disease. We have studied the effect of long-time storage, individual age and sampling month and conclude that storage-time has similar impact on protein levels as age. The results emphasize the need to include sample parameters as covariates in future epidemiological studies, which may facilitate future discoveries of novel biomarkers for disease.
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Affiliation(s)
- Stefan Enroth
- Department of Immunology, Genetics, and Pathology, Biomedical Center, SciLifeLab Uppsala, Uppsala University, SE 75108 Uppsala, Sweden.
| | - Göran Hallmans
- Department of Biobank Research, Umeå University, SE 90187 Umeå, Sweden
| | - Kjell Grankvist
- Department of Medical Biosciences, Clinical Chemistry, Umeå University, SE 90185 Umeå, Sweden
| | - Ulf Gyllensten
- Department of Immunology, Genetics, and Pathology, Biomedical Center, SciLifeLab Uppsala, Uppsala University, SE 75108 Uppsala, Sweden
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