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2015 ; 21
(1
): 15-25
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Glucagon-Like Peptide 1 Protects against Hyperglycemic-Induced
Endothelial-to-Mesenchymal Transition and Improves Myocardial Dysfunction by
Suppressing Poly(ADP-Ribose) Polymerase 1 Activity
#MMPMID25715248
Yan F
; Zhang GH
; Feng M
; Zhang W
; Zhang JN
; Dong WQ
; Zhang C
; Zhang Y
; Chen L
; Zhang MX
Mol Med
2015[Feb]; 21
(1
): 15-25
PMID25715248
show ga
Under high glucose conditions, endothelial cells respond by acquiring fibroblast
characteristics, that is, endothelial-to-mesenchymal transition (EndMT),
contributing to diabetic cardiac fibrosis. Glucagon-like peptide-1 (GLP-1) has
cardioprotective properties independent of its glucose-lowering effect. However,
the potential mechanism has not been fully clarified. Here we investigated
whether GLP-1 inhibits myocardial EndMT in diabetic mice and whether this is
mediated by suppressing poly(ADP-ribose) polymerase 1 (PARP-1). Streptozotocin
diabetic C57BL/6 mice were treated with or without GLP-1 analog (24 nmol/kg
daily) for 24 wks. Transthoracic echocardiography was performed to assess cardiac
function. Human aortic endothelial cells (HAECs) were cultured in normal glucose
(NG) (5.5 mmol/L) or high glucose (HG) (30 mmol/L) medium with or without
GLP-1analog. Immunofluorescent staining and Western blot were performed to
evaluate EndMT and PARP-1 activity. Diabetes mellitus attenuated cardiac function
and increased cardiac fibrosis. Treatment with the GLP-1 analog improved diabetes
mellitus-related cardiac dysfunction and cardiac fibrosis. Immunofluorescence
staining revealed that hyperglycemia markedly increased the percentage of von
Willebrand factor (vWF)(+)/alpha smooth muscle actin (?-SMA)(+) cells in total
?-SMA(+) cells in diabetic hearts compared with controls, which was attenuated by
GLP-1 analog treatment. In cultured HAECs, immunofluorescent staining and Western
blot also showed that both GLP-1 analog and PARP-1 gene silencing could inhibit
the HG-induced EndMT. In addition, GLP-1 analog could attenuate PARP-1 activation
by decreasing the level of reactive oxygen species (ROS). Therefore, GLP-1
treatment could protect against the hyperglycemia-induced EndMT and myocardial
dysfunction. This effect is mediated, at least partially, by suppressing PARP-1
activation.