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2015 ; 13
(ä): 371
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Differential urinary glycoproteome analysis of type 2 diabetic nephropathy using
2D-LC-MS/MS and iTRAQ quantification
#MMPMID26608305
Guo Z
; Liu X
; Li M
; Shao C
; Tao J
; Sun W
; Li M
J Transl Med
2015[Nov]; 13
(ä): 371
PMID26608305
show ga
BACKGROUND: Diabetic nephropathy (DN) is the leading cause of chronic kidney
failure and end-stage kidney disease. More accurate and non-invasive test for the
diagnosis and monitoring the progression of DN is urgently needed for the better
care of such patients. METHODS: In this study we utilized urinary glycoproteome
to discover the differential proteins during the course of type 2 DN. The urinary
glycoproteins from normal controls, normalbuminuira, microalbuminura, and
macroalbuminuria patients were enriched by concanavalin A (ConA) and analyzed by
2DLC/MS/MS and isobaric tags for relative and absolute quantitation
quantification. RESULTS: A total of 478 proteins were identified and 408 were
annotated as N-linked glycoproteins. A total of 72, 107 and 123 differential
proteins were identified in normalbuminuria, microalbuminuria and
macroalbuminuria, respectively. By bioinformatics analysis, in normalbuminruia
state, cell proliferation and cell movement were activated, which might reflect
the compensatory phase during the disease development. In micro- and
macro-albuminuria, cell death and apoptosis was activated, which might reflect
the de-compensatory phase. Pathway analysis showed acute phase proteins, the
member of high density lipoprotein and low density lipoprotein proteins were
changed, indicating the role of the inflammatory response and lipid metabolism
abnormality in the pathogenesis of DN. Six selected differential proteins were
validated by Western Blot. Alpha-1-antitrypsin (SERPINA1) and Ceruloplasmin are
the two markers with excellent area under curve values (0.929 and 1.000
respectively) to distinguish the microalbuminuria and normalbuminuria. For the
first time, we found pro-epidermal growth factor and prolactin-inducible protein
were decreased in macroalbuminuria stage, which might reflect the inhibition of
cell viability and the activation of cell death in kidney. CONCLUSIONS: Above
data indicated that urinary glycoproteome could be useful to distinguish the
differences in protein profiles in different stages in DN, which will help better
individualized care of patients in DN.