Study of tungstate–protein interaction in human serum by LC–ICP-MS and MALDI-TOF



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Rodríguez Fariñas, Nuria and Gómez Gómez, M.Milagros and Cámara Rica, Carmen (2008) Study of tungstate–protein interaction in human serum by LC–ICP-MS and MALDI-TOF. Analytical and bioanalytical chemistry, 390 (1). pp. 29-35. ISSN 1618-2650 (Online) 1618-2642(Print)

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Oral administration of sodium tungstate is an effective treatment for type 1 and 2 diabetes in animal models; it does not incur significant side effects, and it may constitute an alternative to insulin. However, the mechanism by which tungstate exerts its observed metabolic effects in vivo is still not completely understood. In this work, serum-containing proteins which bind tungstate have been characterized. Size exclusion chromatography (SEC) coupled to inductively coupled plasma mass spectrometry (ICP-MS) with a Phenomenex Bio-Sep-S 2000 column and 20 mM HEPES and 150 mM NaCl at pH 7.4 as the mobile phase was chosen as the most appropriate methodology to screen for tungsten–protein complexes. When human serum was incubated with tungstate, three analytical peaks were observed, one related to tungstate–albumin binding, one to free tungstate, and one to an unknown protein binding (MW higher than 300 kDa). Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometric analysis of the tungsten-containing fractions collected from SEC–ICP-MS chromatograms, after desalting and preconcentration processes, confirmed the association of tungstate with albumin and the other unknown protein.

Item Type:Article
Uncontrolled Keywords:TungstateDiabetesLC–ICP-MSMALDI-TOFHuman serum proteins
Subjects:Sciences > Chemistry > Analytic chemistry
ID Code:41815
Deposited On:14 Mar 2017 16:32
Last Modified:15 Mar 2017 09:00

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