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[Expression of heme oxygenase-1 in skeletal muscle after ischemia-reperfusion in rats].

OBJECTIVE
To observe the changes of heme oxygenase-1 (HO-1) expression in the skeletal muscle after ischemia-reperfusion of hind limb in rats.


METHODS
A model of hind limb ischemia was made by clamping femoral artery with a microvascular clip. Soleus muscle was obtained from the animals received sham operation, 4 h ischemia without reperfusion and 2 h, 4 h, 8 h, 16 h, 24 h reperfusion after 4 h ischemia. Soleus histology and malondialdehyde (MDA) content were measured. The levels of HO-1 mRNA and protein were measured in different time by Northern blotting, Western blotting and immunohistochemistry technique.


RESULTS
After ischemia-reperfusion of limb, HO-1 mRNA increased at the 2nd hour, reached a peak at the 8th hour, and returned toward baseline at the 24th hour. The change of protein level was essentially in agreement with that of mRNA. Immunohistochemical results showed that HO-1 expressed primarily in skeletal muscle cytoplasma. There were no positive signals of mRNA and protein in sham group and in ischemia group. After limb reperfusion, MDA contents in the soleus muscle increased significantly when compared with that in the sham group (P < 0.05). MDA content of the 8th after reperfusion decreased significantly when compared with that of the 4 h after reperfusion (P < 0.05).


CONCLUSION
Ischemia-reperfusion can induce HO-1 expression in skeletal muscle in rats, which may provide protection for injured tissue.