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Increased glyoxalase I levels inhibit accumulation of oxidative stress and an advanced glycation end product in mouse mesangial cells cultured in high glucose.

Abstract：

:Chronic high glucose levels lead to the formation of advanced glycation end-products (AGEs) as well as AGE precursors, such as methylglyoxal (MG) and glyoxal, via non-enzymatic glycation reactions in patients with diabetic mellitus. Glyoxalase 1 (GLO-1) detoxifies reactive dicarbonyls that form AGEs. To investigate the interaction between AGEs and GLO-1 in mesangial cells (MCs) under diabetic conditions, AGE levels and markers of oxidative stress were measured in GLO-1-overexpressing MCs (GLO-1-MCs) cultured in high glucose. Furthermore, we also examined levels of high glucose-induced apoptosis in GLO-1-MCs. In glomerular MCs, high glucose levels increased the formation of both MG and argpyrimidine (an MG-derived adduct) as well as GLO-1 expression. GLO-1-MCs had lower intracellular levels of MG accumulation, 8-hydroxy-deoxyguanosine (an oxidative DNA damage marker), 4-hydroxyl-2-nonenal (a lipid peroxidation product), and nitrosylated protein (a marker of oxidative-nitrosative stress) compared to control cells. Expression of mitochondrial oxidative phosphorylation complexes I, II, and III was also decreased in GLO-1-MCs. Furthermore, fewer GLO-1-MCs showed evidence of apoptosis as determined by terminal deoxynucleotidyl transferase-mediated dUTP nick labeling assay, and activation of both poly (ADP-ribose) polymerase 1 cleavage and caspase-3 was lower in GLO-1-MCs than in control cells cultured in high glucose. These results suggest that GLO-1 plays a role in high glucose-mediated signaling by reducing MG accumulation and oxidative stress in diabetes mellitus.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Kim KM,Kim YS,Jung DH,Lee J,Kim JS

doi

10.1016/j.yexcr.2011.10.013

subject

Has Abstract

pub_date

2012-01-15 00:00:00

pages

152-9

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(11)00410-1

journal_volume

318

pub_type

杂志文章

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