Phosphoproteomic profile of peripheral blood mononuclear cells in mesangial proliferative glomerulonephritis patients

To insight the pathogenesis of Mesangial proliferative glomerulonephritis (MsPGN), we investigated the phosphoproteomic profile of PBMCs from MsPGN patients and normal subjects by integrating TiO 2 enrichment technology, 2D nano-liter liquid chromatography and linear ion trap quadrupole mass spectrometry. We identified totally 693 differential phosphorylation sites and corresponded to 439 genes. Gene ontology (GO) analysis showed that protein or nucleic acid binding took up the largest proportion of molecular function, followed by nucleobase, nucleoside, nucleotide and nucleic acid metabolic process in the nucleus. KEGG Pathway analysis showed that most of differential gene enrich in mitogen-activated protein kinase (MAPK) signaling pathway and focal adhesion pathway. Gene network analysis showed that serine/arginine repetitive matrix (SRRM) 1, histone deacetylase (HDAC) 1 and protein kinase C delta (PRKED) were significantly regulators in the network. These results suggested that abnormal changes of protein phosphorylation modification may contribute to MsPGN, and may be derived from the dysregulation of MAPK signaling pathway and focal adhesion pathway. In these pathways, the differential genes SRRM1, HDAC1 and PRKCD with higher connection may be the promising biomarker for MsPGN.