Protective effects of morphine preconditioning in delayed phase on myocardial ischemia-reperfusion injury in rabbits.
The aim of this study was to investigate the protective mechanisms of delayed-phase morphine preconditioning on myocardial ischemia-reperfusion injury. Thirty healthy male New Zealand white rabbits were randomly divided into three groups: a sham operation group (C), ischemia-reperfusion group (I/R), and delayed-phase morphine preconditioning group (M) (N = 10/group). Rabbits in the C group received thoracotomy for 160 min. Rabbits in the I/R group received left artery blockage for 40 min and reperfusion for 120 min. Rabbits in the M group received 1.0 mg/kg intravenous morphine 24 h prior to the identical treatment as the rabbits in the I/R group. In each group, the interleukin (IL)-10 and tumor necrosis factor (TNF)-α levels were detected at five time points: 20 min before the left coronary artery blockage (T1), 20 and 40 min after the left coronary artery blockage (T2 and T3, respectively), and 1 and 2 h after the myocardial reperfusion (T4 and T5, respectively). After reperfusion, the infarction size was measured with Evans blue and 2,3,5-triphenyltetrazolium chloride (TTC) staining. Compared with the C group, serum IL-10 and TNF-α concentrations increased in the I/R and M groups; the difference was significant (P < 0.05). When compared with the I/R group, the IL-10 concentrations in the M group were significantly increased (P < 0.05), but the infarction size and TNF-α concentrations were significantly decreased (P < 0.05). These results suggested that delayed-phase morphine preconditioning might achieve myocardial protection through the regulation and balance of inflammatory cytokines.
Department of Anesthesiology, the Second Xiangya Hospital, Central South University, Changsha, China.
X-H
XH
Lu
Department of Anesthesiology, the Second Xiangya Hospital, Central South University, Changsha, China.
K
K
Ran
Department of Anesthesiology, the Second Xiangya Hospital, Central South University, Changsha, China.
Y-Y
YY
Xiao
Department of Anesthesiology, the Second Xiangya Hospital, Central South University, Changsha, China.
D-L
DL
Yang
Department of Anesthesiology, the Second Xiangya Hospital, Central South University, Changsha, China.
Y-T
YT
Chang
Department of Anesthesiology, the Third Xiangya Hospital, Central South University, Changsha, China.
K-M
KM
Duan
Department of Anesthesiology, the Third Xiangya Hospital, Central South University, Changsha, China.
Y-W
YW
Ou
D000818:Animals; D016753:Interleukin-10 / Q000097:blood; D019194:Ischemic Preconditioning / Q000379:methods*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D011817:Rabbits; D011897:Random Allocation; D015427:Reperfusion Injury / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D009020:Morphine