title: Schisandrin B protects myocardial ischemia-reperfusion injury partly by inducing Hsp25 and Hsp70 expression in rats.
abstract: Schisandrin B (Sch B) is a hepato- and cardioprotective ingredient isolated from the fruit of Schisandra chinensis, a traditional Chinese herb clinically used to treat viral and chemical hepatitis. In order to investigate whether the induction of heat shock protein (Hsp)25 and Hsp70 expression plays a role in the cardioprotection afforded by Sch B pre-treatment against ischemia-reperfusion (I-R) injury, the time-course of myocardial Hsp25 and Hsp70 expression was examined in Sch B-pre-treated rats. Sch B pre-treatment (1.2 mmol/kg) produced time-dependent increases in Hsp25 and Hsp70 expression in rat hearts, with the maximum enhancement observable at 48 and 72 h post-dosing, respectively. Buthionine sulfoximine/phorone treatment, while abolishing the beneficial effect of Sch B on mitochondrial glutathione redox status, did not completely abrogate the cardioprotection against I-R injury. Heat shock treatment could increase myocardial Hsp25 and Hsp70 expression and protect against I-R injury under the present experimental conditions. The results indicate that the induction of Hsp25 and Hsp70 expression contributes at least partly to the cardioprotection afforded by Sch B pre-treatment against I-R injury.
authors.affiliation: Department of Biochemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong SAR, China.
authors.forename: Po Yee
authors.initials: PY
authors.lastname: Chiu
authors.forename: Kam Ming
authors.initials: KM
authors.lastname: Ko
mesh_terms: D000818:Animals; D002316:Cardiotonic Agents / Q000008:administration & dosage*; D034242:Cyclooctanes / Q000008:administration & dosage*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects*; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D017705:Lignans / Q000008:administration & dosage*; D015428:Myocardial Reperfusion Injury / Q000188:drug therapy* / Q000378:metabolism* / Q000473:pathology; D009206:Myocardium / Q000378:metabolism* / Q000473:pathology; D011083:Polycyclic Compounds / Q000008:administration & dosage*; D051381:Rats; D017207:Rats, Sprague-Dawley; D032141:Schisandra / Q000737:chemistry
chemical_list: D002316:Cardiotonic Agents; D034242:Cyclooctanes; D018840:HSP70 Heat-Shock Proteins; D017705:Lignans; D011083:Polycyclic Compounds; C015499:schizandrin B