scholarly journals Vitamin D–Binding Protein Concentrations Quantified by Mass Spectrometry

2015 ◽  
Vol 373 (15) ◽  
pp. 1480-1482 ◽  
Author(s):  
Andrew N. Hoofnagle ◽  
John H. Eckfeldt ◽  
Pamela L. Lutsey
Keyword(s):  
Mass Spectrometry ◽  
Vitamin D ◽  
Binding Protein ◽  
Vitamin D Binding Protein

scholarly journals Proteomics Approach for the Discovery of Rheumatoid Arthritis Biomarkers Using Mass Spectrometry

2019 ◽  
Vol 20 (18) ◽  
pp. 4368 ◽  
Author(s):  
Mun ◽  
Lee ◽  
Park ◽  
Kim ◽  
Lee ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Mass Spectrometry ◽  
Vitamin D ◽  
Binding Protein ◽  
Joint Destruction ◽  
Protein Profiling ◽  
Serum Amyloid ◽  
Healthy Controls ◽  
Vitamin D Binding Protein ◽  
Proteomics Approach

Rheumatoid arthritis is an autoimmune disease that causes serious functional loss in patients. Early and accurate diagnosis of rheumatoid arthritis may attenuate its severity. Despite a diagnosis guideline in the 2010 American College of Rheumatology (ACR)/European League Against Rheumatism (EULAR) classification criteria for rheumatoid arthritis, the practical difficulties in its diagnosis highlight the need of developing new methods for diagnosing rheumatoid arthritis. The current study aimed to identify rheumatoid arthritis diagnostic biomarkers by using a proteomics approach. Serum protein profiling was conducted using mass spectrometry, and five distinguishable biomarkers were identified therefrom. In the validation study, the five biomarkers were quantitatively verified by multiple reaction monitoring (MRM) analysis. Two proteins, namely serum amyloid A4 and vitamin D binding protein, showed high performance in distinguishing patients with rheumatoid arthritis from healthy controls. Logistic analysis was conducted to evaluate how accurately the two biomarkers distinguish patients with rheumatoid arthritis from healthy controls. The classification accuracy was 86.0% and 81.4% in patients with rheumatoid arthritis and in healthy controls, respectively. Serum amyloid A4 and vitamin D binding protein could be potential biomarkers related to the inflammatory response and joint destruction that accompany rheumatoid arthritis.

scholarly journals Phenotyping and relative quantification of vitamin D binding protein in a paediatric population by using liquid chromatography–tandem mass spectrometry

2018 ◽  
Vol 56 (1) ◽  
pp. 56-63
Author(s):  
Ana I Cillero ◽  
Eduardo Martínez-Morillo ◽  
Laura Mantecón ◽  
María Agustina Alonso ◽  
Helena Gil-Peña ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Vitamin D ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Binding Protein ◽  
Tandem Mass ◽  
Relative Quantification ◽  
Vitamin D Binding Protein ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

Background Adequate concentrations of vitamin D are required to ensure bone health and minimize the incidence of multiple extraskeletal diseases. Although total 25-hydroxyvitamin D (25OHD) remains the recommended biomarker for assessing vitamin D status, it has been speculated that free 25OHD correlates better with clinical outcomes. The calculation of free 25OHD depends on the concentrations of vitamin D binding protein (DBP), the determination of which involves different immunoassays and has led to varying results and conclusions. We developed a liquid chromatography–tandem mass spectrometry (LC-MS/MS) method for simultaneous identification and relative quantification of DBP isoforms. Methods We used serum samples from healthy children ( n = 79), mainly Caucasian (88%). Proteins were denatured, reduced, alkylated and digested with trypsin. Purified peptides were analysed by LC-MS/MS. The DBP phenotype was established by using the combinations of tryptic peptides associated with each of the three isoforms and one peptide common to all of them to perform relative quantification. The genotyping of volunteers ( n = 7) facilitated verification of the ability of our method to correctly identify the DBP phenotype. Results The DBP phenotype was correctly established in all samples from volunteers, based on the 100% correlation observed with the genotype. The most common DBP phenotype in Caucasian children was 2/1S (34%) and the rarest 1F/1F (2%). The relative quantification of DBP concentrations did not show statistically significant differences between phenotypes ( P = 0.11). Conclusions LC-MS/MS enabled simultaneous phenotyping and relative quantification of DBP, while avoiding the analytical limitations of immunoassays and confirming similar concentrations of DBP in all phenotypes.

Vitamin D binding protein (DBP) is required for pro-invasion effects of vitamin D on placental trophoblastic cells

2019 ◽  
Author(s):  
Ankana Ganguly ◽  
Alexandra Shattock ◽  
Annsha Joseph ◽  
Janesh Gupta ◽  
Martin Hewison
Keyword(s):  
Vitamin D ◽  
Binding Protein ◽  
Vitamin D Binding Protein ◽  
Trophoblastic Cells
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