[Time course change in the high mobility group box-1 after myocardial infarction in rats].
OBJECTIVE
To investigate the time course change in myocardial high mobility group box-1 (HMGB1) after myocardial infarction in rats.


METHODS
Myocardial infarction (MI) was induced in SD rats by ligation of the anterior descending coronary artery. At 1, 2, 4, and 8 weeks after MI, the cardiac function of the rats was examined, and the expressions of HMGB1 at mRNA and protein levels in the myocardium were detected using real-time RT-PCR and Western blotting, respectively.


RESULTS
Cardiac function test confirmed that the MI model was successfully induced. The expression of HMGB1 mRNA was increased in early stage (1 week) after MI, while significantly down-regulated in later stage (4-8 weeks after MI). HMGB1 protein showed a similar biphasic pattern of changes, and was up-regulated early (1-2 weeks) after MI (P<0.05) and decreased markedly (P<0.01) at 8 weeks.


CONCLUSIONS
As an inflammatory regulator, HMGB1 can modulate inflammatory response early time after MI and functions later as a transcriptional modulator, thus contributing to the myocardial repair after MI. Interventions targeting HMGB1 in different stages after MI may prove helpful in reducing the complications, improving the prognosis and promoting long-term survival.
Wang
Xiao-wu
XW
Centre of Cardiac Surgery, Guangzhou General Hospital, Guangzhou Military Command, Guangzhou, China.
Zhang
Wei-da
WD
Wang
Xiao-li
XL
Li
Jie
J
Yuan
Bin-bin
BB
D000818:Animals; D015153:Blotting, Western; D024243:HMGB1 Protein / Q000235:genetics* / Q000378:metabolism; D008297:Male; D009203:Myocardial Infarction / Q000503:physiopathology*; D009206:Myocardium / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors
D024243:HMGB1 Protein; D012333:RNA, Messenger