化学
硒
色谱法
电感耦合等离子体质谱法
硒酸盐
高效液相色谱法
检出限
质谱法
同位素稀释
离子色谱法
肺癌
内科学
医学
有机化学
作者
Belén Callejón‐Leblic,Gema Rodríguez-Moro,Ana Arias-Borrego,Antonio Pereira‐Vega,José Luis Gómez-Ariza,Tamara García-Barrera
标识
DOI:10.1016/j.chroma.2020.460919
摘要
One of the most important causes of the high mortality rate and low life expectancy of lung cancer is the detection at advanced stages. Thus, there is an urgent need for early diagnosis and the search of new selective biomarkers. Selenium is an important constituent of selenoproteins and a powerful antioxidant able to protect against cancer. In this work, the absolute quantification of selenium in selenoproteins and the total content in selenometabolites has been performed for the first time in serum from lung cancer patients (LC) and healthy controls (HC). To this end, a method for the simultaneous speciation of selenoproteins using size exclusion chromatography (SEC) and affinity chromatography (AF) with detection by ICP-QQQ-MS, and quantification by isotopic dilution (IDA) (SEC-AF-HPLC-SUID-ICP-QQQ-MS) was developed to determine the selenium concentration in eGPx, SEPP1 and SeAlb, as well as total selenometabolites, to find alterations that may serve as biomarkers of this disease. In the same way, a method based on anion-exchange chromatography coupled to ICP-QQQ-MS was developed to quantify selenometabolites (SeCys2, SeMeSeCys, SeMet, selenite and selenate) in the same LC and HC serum samples. The results showed that the averaged concentrations of selenium in eGPx, SeAlb and selenite were significantly higher in LC patients (LC (eGPx: 21.24 ± 0.77 ng g−1; SeAlb: 49.56 ± 3.16 ng g−1 and Se(IV): 6.20 ± 1.22 ng g−1) than in HC group (eGPx: 16.96 ± 0.53 ng g−1; SeAlb: 38.33 ± 2.66 ng g−1 and Se(IV): 3.56 ± 0.55 ng g−1). In addition, the ratios between selenoproteins and selenometabolites have been calculated for the first to study their potential use as LC biomarkers. The rates eGPx/SEPP1, SEPP1/SeAlb, eGPx/Se(IV) and SEPP1/Se(IV) were significantly different between LC and HC groups.
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