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Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay
Nontransferrin-bound iron (NTBI) is a heterogeneously speciated plasma iron, typically detectable when transferrin saturation (TfSat) exceeds 75%. Here, we examine factors affecting NTBI levels by a recently discovered direct chelator-based (CP851) fluorescent bead-linked flow-cytometric assay (bead...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5110642/ https://www.ncbi.nlm.nih.gov/pubmed/27344508 http://dx.doi.org/10.1016/j.trsl.2016.05.005 |
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author | Garbowski, Maciej W. Ma, Yongmin Fucharoen, Suthat Srichairatanakool, Somdet Hider, Robert Porter, John B. |
author_facet | Garbowski, Maciej W. Ma, Yongmin Fucharoen, Suthat Srichairatanakool, Somdet Hider, Robert Porter, John B. |
author_sort | Garbowski, Maciej W. |
collection | PubMed |
description | Nontransferrin-bound iron (NTBI) is a heterogeneously speciated plasma iron, typically detectable when transferrin saturation (TfSat) exceeds 75%. Here, we examine factors affecting NTBI levels by a recently discovered direct chelator-based (CP851) fluorescent bead-linked flow-cytometric assay (bead-NTBI), compared with the established indirect nitrilotriacetate (NTA) assay in 122 iron-overloaded patients, including 64 on recent iron chelation therapy and 13 healthy volunteers. Both methods correlated (r = 0.57, P < 0.0001) but with low agreement, attributable to 2 major factors: (1) the NTA method, unlike the bead method, is highly dependent on TfSat, with NTBI under-estimation at low TfSat and over-estimation once Tf is saturated, (2) the bead method detects <3-fold higher values than the NTA assay in patients on recent deferiprone-containing chelation due to greater detection of chelate complexes but lower values for patients on deferasirox. The optimal timing of sample collection relative to chelation dosing requires further study. Patients with splenectomy, high-storage iron, and increased erythropoiesis had greater discrepancy between assays, consistent with differential access by both methods to the NTBI pools associated with these clinical variables. The bead-NTBI assay has advantages over the NTA assay, being less dependent on TfSat, hence of less tendency for false-negative or false-positive values at low and high TfSat, respectively. |
format | Online Article Text |
id | pubmed-5110642 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-51106422016-11-21 Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay Garbowski, Maciej W. Ma, Yongmin Fucharoen, Suthat Srichairatanakool, Somdet Hider, Robert Porter, John B. Transl Res Original Article Nontransferrin-bound iron (NTBI) is a heterogeneously speciated plasma iron, typically detectable when transferrin saturation (TfSat) exceeds 75%. Here, we examine factors affecting NTBI levels by a recently discovered direct chelator-based (CP851) fluorescent bead-linked flow-cytometric assay (bead-NTBI), compared with the established indirect nitrilotriacetate (NTA) assay in 122 iron-overloaded patients, including 64 on recent iron chelation therapy and 13 healthy volunteers. Both methods correlated (r = 0.57, P < 0.0001) but with low agreement, attributable to 2 major factors: (1) the NTA method, unlike the bead method, is highly dependent on TfSat, with NTBI under-estimation at low TfSat and over-estimation once Tf is saturated, (2) the bead method detects <3-fold higher values than the NTA assay in patients on recent deferiprone-containing chelation due to greater detection of chelate complexes but lower values for patients on deferasirox. The optimal timing of sample collection relative to chelation dosing requires further study. Patients with splenectomy, high-storage iron, and increased erythropoiesis had greater discrepancy between assays, consistent with differential access by both methods to the NTBI pools associated with these clinical variables. The bead-NTBI assay has advantages over the NTA assay, being less dependent on TfSat, hence of less tendency for false-negative or false-positive values at low and high TfSat, respectively. Elsevier 2016-11 /pmc/articles/PMC5110642/ /pubmed/27344508 http://dx.doi.org/10.1016/j.trsl.2016.05.005 Text en © 2016 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Original Article Garbowski, Maciej W. Ma, Yongmin Fucharoen, Suthat Srichairatanakool, Somdet Hider, Robert Porter, John B. Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title | Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title_full | Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title_fullStr | Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title_full_unstemmed | Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title_short | Clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
title_sort | clinical and methodological factors affecting non-transferrin-bound iron values using a novel fluorescent bead assay |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5110642/ https://www.ncbi.nlm.nih.gov/pubmed/27344508 http://dx.doi.org/10.1016/j.trsl.2016.05.005 |
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