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OBJECTIVE: To determine glycoprotein content in recombinant human albumin from different expression systems with different methods. METHODS: Recombinant human albumin samples from Saccharomyces cerevisiae expression system, Pichia pastoris expression system, Oryza sativa expression system as well as plasma derived human albumin were investigated by phenol sulfuric acid method, HPLC peak area method and ConA combining elution HPLC method. RESULTS: For 10 batches of samples expressed in pichia pastoris expression system, the total contents of mannose were 2.7 mg•g(Pro)-1 (A manufacturer, n = 4) and 1.7 mg•g (Pro)-1 (B manufacturer, n = 6), respectively. The HPLC peak area percentages of ConA binding protein in recombinant human albumin from Pichia pastoris expression system were the highest, which showed 2.65% (A manufacturer) and 0.71% (B manufacturer) respectively, the peak area percentage of ConA binding protein in Oryza sativa expression system was 0.05% (E manufacturer, n = 3), and the ConA binding protein peak area of plasma derived human albumin was 0.01% (W manufacturer). The results of ConA binding and elution analysis with HPLC method for Quantitative determination of ConA binding protein showed that the ConA binding protein contents in the samples from pichia pastoris expression system were much higher: 27.58 mg•g(Pro)-1 (A manufacturer), 21.48 mg•g(Pro)-1 (B manufacturer), 32.02 mg•g(Pro)-1 (C manufacturer); the ConA binding protein content in the sample from Saccharomyces cerevisiae expression system was lower, 2.29 mg•g(Pro)-1 (D manufacturer); the ConA binding protein content in the samples from oryza sativa expression system was the lowest, 1.27 mg•g(Pro)-1 (E manufacturer); the plasma derived human albumin ConA binding protein content was 31.16 mg•g(Pro)-1 (S manufacturer). CONCLUSION: In terms of the results of the samples and methods involved in this study, there were glycosylated or glycol forms of protein in all recombinant human albumin samples from different expression systems; the glycosylated protein content in samples of Pichia pastoris expression system is higher than Saccharomyces cerevisiae expression system, while the glycoformed protein in samples of Oryza sativa expression system is the lowest. Plasma derived human albumin also contains glycoprotein or glycosylated protein.
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OBJECTIVE: To apply lectin affinity chromatography and glycoproteomics-based LC-MS/MS to preliminarily investigate the possible potential plasma biomarkers of Opisthorchis viverrini (OV)-associated CCA in OV/dimethylnitrosamine (DMN)-induced CCA hamster model. METHODS: Nine Syrian hamsters were divided into 3 groups as follows (n = 3 each): normal (healthy control group); OV group; and OV/DMN group (CCA group). Pooled plasma samples collected from animals in each group at the 6th month post-infection with OV metacercarae were subjected to glycoproteomics analysis. Glycoproteins in the pooled sample from each group were initially isolated by concanavalin A (ConA)-based affinity chromatography. The expression of glycoproteins isolated by both enrichment methods were determined using LC-MS/MS. RESULTS: Among the 24 ConA-binding glycoproteins isolated, two proteins, N-myc downstream regulated gene 1 (NDRG1) and fetuin-B (FETUB) were found up-regulated only in the samples from the OV and control groups, but not in the OV/DMN (CCA) groups. On the other hand, one protein, i.e., NSFL1 cofactor p47 isoform ×3 (NSFL1C) was found only in the samples from OV/DMN (CCA) and control groups, but not in the OV group. The remaining 21 proteins were upregulated in the samples from all groups. CONCLUSIONS: NDRG1, FETUB and NSFL1C glycoproteins isolated by ConA-based affinity chromatography could be potential biomarkers for CCA. Plasma samples with negative for NDRG1 and FETUB proteins but positive for NSFL1C are likely to be OV-associated CCA. Nevertheless, this conclusion remains to be confirmed whether this battery test can discriminate OV-associated CCA from other risk factors.
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OBJECTIVE@#To apply lectin affinity chromatography and glycoproteomics-based LC-MS/MS to preliminarily investigate the possible potential plasma biomarkers of Opisthorchis viverrini (OV)-associated CCA in OV/dimethylnitrosamine (DMN)-induced CCA hamster model.@*METHODS@#Nine Syrian hamsters were divided into 3 groups as follows (n = 3 each): normal (healthy control group); OV group; and OV/DMN group (CCA group). Pooled plasma samples collected from animals in each group at the 6th month post-infection with OV metacercarae were subjected to glycoproteomics analysis. Glycoproteins in the pooled sample from each group were initially isolated by concanavalin A (ConA)-based affinity chromatography. The expression of glycoproteins isolated by both enrichment methods were determined using LC-MS/MS.@*RESULTS@#Among the 24 ConA-binding glycoproteins isolated, two proteins, N-myc downstream regulated gene 1 (NDRG1) and fetuin-B (FETUB) were found up-regulated only in the samples from the OV and control groups, but not in the OV/DMN (CCA) groups. On the other hand, one protein, i.e., NSFL1 cofactor p47 isoform ×3 (NSFL1C) was found only in the samples from OV/DMN (CCA) and control groups, but not in the OV group. The remaining 21 proteins were upregulated in the samples from all groups.@*CONCLUSIONS@#NDRG1, FETUB and NSFL1C glycoproteins isolated by ConA-based affinity chromatography could be potential biomarkers for CCA. Plasma samples with negative for NDRG1 and FETUB proteins but positive for NSFL1C are likely to be OV-associated CCA. Nevertheless, this conclusion remains to be confirmed whether this battery test can discriminate OV-associated CCA from other risk factors.
ABSTRACT
Objective To apply lectin affinity chromatography and glycoproteomics-based LC-MS/MS to preliminarily investigate the possible potential plasma biomarkers of Opisthorchis viverrini (OV)-associated CCA in OV/dimethylnitrosamine (DMN)-induced CCA hamster model. Methods Nine Syrian hamsters were divided into 3 groups as follows (n = 3 each): normal (healthy control group); OV group; and OV/DMN group (CCA group). Pooled plasma samples collected from animals in each group at the 6th month post-infection with OV metacercarae were subjected to glycoproteomics analysis. Glycoproteins in the pooled sample from each group were initially isolated by concanavalin A (ConA)-based affinity chromatography. The expression of glycoproteins isolated by both enrichment methods were determined using LC-MS/MS. Results Among the 24 ConA-binding glycoproteins isolated, two proteins, N-myc downstream regulated gene 1 (NDRG1) and fetuin-B (FETUB) were found up-regulated only in the samples from the OV and control groups, but not in the OV/DMN (CCA) groups. On the other hand, one protein, i.e., NSFL1 cofactor p47 isoform ×3 (NSFL1C) was found only in the samples from OV/DMN (CCA) and control groups, but not in the OV group. The remaining 21 proteins were upregulated in the samples from all groups. Conclusions NDRG1, FETUB and NSFL1C glycoproteins isolated by ConA-based affinity chromatography could be potential biomarkers for CCA. Plasma samples with negative for NDRG1 and FETUB proteins but positive for NSFL1C are likely to be OV-associated CCA. Nevertheless, this conclusion remains to be confirmed whether this battery test can discriminate OV-associated CCA from other risk factors.
