[High glucose and tea polyphenols on expression of matrix metalloproteinase-2 and extracellular matrix metalloproteinase inducer in human umbilical vein endothelial cells].
OBJECTIVE
To investigate the effects of high glucose on expression of matrix metalloproteinase-2 (MMP-2) and extracellular matrix metalloproteinase inducer (EMMPRIN) in human umbilical vein endothelial cells (HUVECs).


METHODS
HUVECs were cultured in DMEM media containing high glucose with or without polyphenols for 24 hours respectively. The activity of MMP-2 in the supernatant was detected by zymography. The expression of MMP-2 mRNA and protein in HUVECs were detected by RT-PCR and Western blot respectively. The expression of EMMPRIN mRNA and protein in the cells were determined by RT-PCR as well as immunocytochemistry and Western blot respectively.


RESULTS
The expression of MMP-2 and EMMPRIN mRNA were suppressed by a high concentration of glucose. Both the MMP-2 activity and protein level of EMMPRIN expression were also significantly decreased. Polyphenols abolished all the above changes of HUVECs induced by a high glucose level (P < 0.05).


CONCLUSIONS
An acute high glucose stimulation down-regulates the activity of MMP-2, the expressions of MMP-2 and EMMPRIN at RNA and protein levels in the endothelial cells, which may play an important roles in diabetic vascular complications in the early phase. Polyphenols treatment can diminish the detrimental effects of high glucose on HUVECs.
Chen
Lu-lu
LL
Department of Pathology, School of Basic Medical Science, Southeast University, Nanjing 210009, China.
Deng
Hong
H
Li
Qun
Q
Chen
Ping-sheng
PS
D051926:Basigin / Q000235:genetics / Q000378:metabolism*; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000378:metabolism*; D005419:Flavonoids / Q000302:isolation & purification / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D020778:Matrix Metalloproteinase 2 / Q000235:genetics / Q000378:metabolism*; D010636:Phenols / Q000302:isolation & purification / Q000494:pharmacology*; D059808:Polyphenols; D012333:RNA, Messenger / Q000378:metabolism; D013662:Tea / Q000737:chemistry*; D014471:Umbilical Veins / Q000166:cytology
D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D012333:RNA, Messenger; D013662:Tea; D051926:Basigin; C522361:MMP2 protein, human; D020778:Matrix Metalloproteinase 2; D005947:Glucose