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Effects of chiral 3-n-butylphthalide on apoptosis induced by transient focal cerebral ischemia in rats.

Abstract：

AIM:To investigate the effects of 3-n-butylphthalide (NBP) on apoptosis induced by transient focal cerebral ischemia in rats, compare the action potency of s-(-)-, r-(+)- and (+/-)-NBP, and clarify the enantiomer that played a main role. METHODS:DNA fragmentation was detected by the terminal deoxynucleotidyl transferase-mediated biotinylated UTP nick end labeling (TUNEL) assay and gel electrophoresis. The expression of cytochrome c and caspase-3 protein was observed by Western blot analysis and immunohistochemistry. Middle cerebral artery was occluded for 2 h. RESULTS:Significant DNA fragmentation was detected at 24 h after reperfusion. This response was inhibited by s-(-)-NBP (5, 10 mg/kg i.p.). s-(-)-NBP 10 mg/kg almost completely inhibited DNA fragmentation, whereas r-(+)- NBP 10 mg/kg showed less effect. (+/-)-NBP (20 mg/kg) showed an inhibitory effect between that of s-(-)-NBP (10 mg/kg) and r-(+)-NBP (10 mg/kg). During the apoptotic process, cytochrome c was released into the cytosol and caspase-3 was activated. This effect was markedly inhibited by s-(-)-NBP, and the action potency of r-(+)- and (+/-)-NBP on the changes of cytochrome c and caspase-3 protein was similar to that on DNA fragmentation. CONCLUSION:NBP, especially its s-(-)-enantiomer, could potently reduce the release of cytochrome c, decrease the activation of caspase-3, and inhibit DNA fragmentation after transient focal cerebral ischemia. Our findings on the beneficial effects of NBP on cerebral ischemia-induced apoptosis might have important implications for the study and treatment of ischemic cerebrovascular diseases.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Chang Q,Wang XL

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

796-804

issue

8

eissn

1671-4083

issn

1745-7254

journal_volume

24

pub_type

杂志文章

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