Table 2.
Characterization of SELDI-TOF-MS biomarkers: P values were obtained according to the non-parametric Mann–Whitney U test (see also Additional file 4: Appendix Table 1)
| m/z | MW | ID | Amino acid sequence | Regulation | |||
|---|---|---|---|---|---|---|---|
| HV vs. NU | P value | Q value | Adj. P value | ||||
| Hepcidin (P81172) | |||||||
| 2191 | 2199 | Hepcidin-20 (frag 65–84) | ICIFCCGCCHRSKCGMCCKT | Up | <0.001 | 0.007 | 0.023 |
| 2792 | 2797 | Hepcidin-25 (frag 60–84) | DTHFPICIFCCGCCHRSKCGMCCKT | Up | <0.001 | 0.004 | 0.023 |
| PACAP-related peptide (P18509) | |||||||
| 4798 | 4800 | PRP-48 (frag 82–129) | DVAHGILNEAYRKVLDQLSAGKHLQSLVARGVGGSLGGGAGDDAEPLS | Up | <0.001 | 0.021 | 0.037 |
| Hemoglobin β subunit (P68871) | |||||||
| 15866 | 15867 | Hemoglobin β subunit (frag 2–147) | VHLTPEEKSAVTALWGKVNVDEVGGEALGRLLVVYPWTQRFFESF GDLSTPDAVMGNPKVKAHGKKVLGAFSDGLAHLDNLKGTFATLSE LHCDKLHVDPENFRLLGNVLVCVLAHHFGKEFTPPVQAAYQKVVA GVANALAHKYH |
Up | 0.021 | NS | NS |
| 7931 | 15867 | Hemoglobin β subunit (frag 2–147) [2H+] | VHLTPEEKSAVTALWGKVNVDEVGGEALGRLLVVYPWTQRFFESF GDLSTPDAVMGNPKVKAHGKKVLGAFSDGLAHLDNLKGTFATLSE LHCDKLHVDPENFRLLGNVLVCVLAHHFGKEFTPPVQAAYQKVVA GVANALAHKYH |
Up | <0.001 | 0.020 | 0.027 |
| S100A8 (P05109) and S100A9 (P06702) | |||||||
| 10844 | 10835 | S100A8 (frag 1–93) | MLTELEKALNSIIDVYHKYSLIKGNFHAVYRDDLKKLLETECPQYIR KKGADVWFKELDINTDGAVNFQEFLILVIKMGVAAHKKSHEESHKE |
Up | <0.001 | 0.008 | 0.0002 |
| 5419 | 10835 | S100A8 (frag 1–93) [2H+] | MLTELEKALNSIIDVYHKYSLIKGNFHAVYRDDLKKLLETECPQYIR KKGADVWFKELDINTDGAVNFQEFLILVIKMGVAAHKKSHEESHKE |
Up | <0.001 | 0.022 | |
| 13269 | 13274 | S100A9 (frag 1–114) [oxydized form] | MTCKMSQLERNIETIINTFHQYSVKLGHPDTLNQGEFKELVRKDLQ NFLKKENKNEKVIEHIMEDLDTNADKQLSFEEFIMLMARLTWASH EKMHEGDEGPGHHHKPGLGEGTP |
Up | <0.001 | 0.004 | 0.0024 |
| 6346 | 12691 | S100A9* (frag 5–114) [2H+] [Ser-actelyl] | S(ac)QLERNIETIINTFHQYSVKLGHPDTLNQGEFKELVRKDLQ NFLKKENKNEKVIEHIMEDLDTNADKQLSFEEFIMLMARLTWASH EKMHEGDEGPGHHHKPGLGEGTP |
Up | <0.001 | 0.013 | |
| Inter-alpha-trypsin inhibitor H4 (ITIH4) (Q14624) | |||||||
| 3157 | 3157 | ITIH4 (isoform 1) frag 617–644 | NVHSGSTFFKYYLQGAKIPKPEASFSPR | Down | <0.001 | 0.007 | 0.017 |
| 3179 | 3180 | ITIH4 (isoform 1) frag 617–644 [aduct Na+] | NVHSGSTFFKYYLQGAKIPKPEASFSPR | Down | <0.001 | 0.007 | 0.017 |
| 3974 | 3972 | ITIH4 (isoform 1) frag 650–687 | QAGAAGSRMNFRPGVL SSRQLGLPGPPDVPDHAAYHPF |
Down | <0.001 | 0.020 | |
| 4282 | 4282 | ITIH4 (isoform 2) frag 617–657 | NVHSAGAAGSRMNFRPGVLSSRQLGLPGPPDVPDHAAYHPF | Down | <0.001 | 0.015 | |
| 4299 | 4298 | ITIH4 (isoform 2) frag 617–657 [Met.Ox] | NVHSAGAAGSRM(ox)NFRPGVLSSRQLGLPGPPDVPDHAAYHPF | Down | <0.001 | 0.015 | |
| Complement C3 alpha chain (P01024) | |||||||
| 8132 | 8132 | C3a (frag 672–739) | SVQLTEKRMDKVGKYPKELRKCCEDGMRENPMRFSCQRRTRFISLG EACKKVFLDCCNYITELRRQHA |
Down | <0.001 | 0.022 | NS |
| Apolipoprotein A–I (P02647) | |||||||
| 28106 | 28061 | ApoA1 (frag 25–267) | DEPPQSPWDRVKDLATVYVDVLKDSGRDYVSQFEGSALGKQLNLKL | Down | <0.001 | 0.029 | NS |
| 28099 | LDNWDSVTST FSKLREQLGPVTQEFWDNLEKETEGLRQEMSKDLEE VKAKVQPYLDDFQK KWQEEMELYRQKVEPLRAELQEGARQKLHEL QEKLSPLGEEMRDRARAHVDALRTHLAPY SDELRQRLAARLEALKEN GGARLAEYHAKATEHLSTLSEKAKPALEDLRQGLLPVLESFKVSFLSALEEYTKKLNT |
Down | <0.001 | 0.05 | |||
Associated Q values were calculated using FDR (1000 permutations) for multiple testing. Adjusted P value for age, gender, smoking status, consumption of alcohol and the presence of pulmonary diseases were performed by multivariate analysis on the SAS software version 9.4
m/z mass/charge ratio of the peak detected by SELDI-TOF-MS, MW molecular weight of the related protein or peptide, ID identification of the related protein or peptide, NS not significant