Objective To observe the change rules of insulin receptor from rat bladders after losing lower cen-tal innervations so as to explore the function of insulin receptor in denervated bladder. Methods From January, 2016 to June, 2017, 40 Sprague-Dawley rats were randomly divided into experimental group and control group,each group was 20. The conus medullaris of rats in experimental group were damaged, and rats in control group received sham opera-tion. The rats in 2 groups were sacrificed at different time after surgery (1 day, 1 week, 1 month, 3 months). Bladder specimens were harvested to perform wet weight measurement and immunohistochemical detection of insulin receptor. Results Corresponding to 1 day, 1 week, 1 month and 3 months after surgery, the bladder wet weight of control group were (0.089±0.022)g, (0.094±0.038)g, (0.106±0.112)g and(0.102±0.048)g, and of experimental group were (0.092± 0.026)g, (0.110 ±0.034)g, (0.538 ±0.098)g and (1.528 ±0.462)g. One month and 3 months after surgery, bladder wet weight of experiment group were significantly increased as compared with those of control group (P<0.05). One day, 1 week, 1 month and 3 months after the operation, the positive rate of insulin receptor expression was 60％, 100％, 100％and 80％. And strongly positive rate was 55％. In control group, the positive rate of insulin receptor expression was 20％, 40％, 40％, and 0％. The expression of insulin receptor in experimental group was significantly higher than that in con-trol group in every stage(P<0.05). Conclusion The expression of insulin receptor is significantly increased after den-ervation of bladder. The defections of insulin receptor might lead to apoptosis and muscle wasting after denervation. Re-store insulin receptor function might be key point to prevent bladder tissue from irreversible damage.

Objective To explore the expressions of Bcl-2 and Bax proteins in the neurons of spinal cord after tibial nerve and common peroneal nerve injuries in rats.Methods A total of 90 male SD rats were randomly divided into three groups, the group A was as control group, group B as suture of tibial nerve cut group, and group C as suture of the common peroneal nerve cut group.The L4-6 segment spinal cord of the rats were removed for HE staining and immumohistochemical staining on 3, 7, 14, 28 days after the operation.The number of motor neurons in the spinal anterior horn were calculated.The expressions differences of Bcl-2 and Bax proteins were detected by immuno-histochemistry, and values of Bcl-2/Bax were calculated.Results The number of motor neurons in the anterior horn of spinal cord in group B were less than that in group C on 1, 3, 7, 14, 28 days after the operation (P< 0.01).The expression of Bcl-2 protein in group B and group C showed an upward and then declining trend.It decreased to the lowest on the postoperative 3 d in group B and 7 d in group C, respectively.The expressions of Bax protein in group B and C showed an upward and then declining trend, and it increased to the highest on the postoperative 3 d in groups B and C.The values of Bcl-2/Bax in groups B and C were showed an decreased and then increased trend and it was lower in group B than group C on the postoperative 3, 7, 14, 28 d(P< 0.01).Conclusion Injuries of tibial nerve and common peroneal nerve of the rats would lead the apoptosis of motor neurons in the spinal cord, but compared with the injury of common peroneal nerve, tibial nerve injury would lead less apoptosis of motor neurons.

Objective To explore the expressions of Bcl-2 and Bax proteins in the neurons of spinal cord after tibial nerve and common peroneal nerve injuries in rats.Methods A total of 90 male SD rats were randomly divided into three groups, the group A was as control group, group B as suture of tibial nerve cut group, and group C as suture of the common peroneal nerve cut group.The L4-6 segment spinal cord of the rats were removed for HE staining and immumohistochemical staining on 3, 7, 14, 28 days after the operation.The number of motor neurons in the spinal anterior horn were calculated.The expressions differences of Bcl-2 and Bax proteins were detected by immuno-histochemistry, and values of Bcl-2/Bax were calculated.Results The number of motor neurons in the anterior horn of spinal cord in group B were less than that in group C on 1, 3, 7, 14, 28 days after the operation (P< 0.01).The expression of Bcl-2 protein in group B and group C showed an upward and then declining trend.It decreased to the lowest on the postoperative 3 d in group B and 7 d in group C, respectively.The expressions of Bax protein in group B and C showed an upward and then declining trend, and it increased to the highest on the postoperative 3 d in groups B and C.The values of Bcl-2/Bax in groups B and C were showed an decreased and then increased trend and it was lower in group B than group C on the postoperative 3, 7, 14, 28 d(P< 0.01).Conclusion Injuries of tibial nerve and common peroneal nerve of the rats would lead the apoptosis of motor neurons in the spinal cord, but compared with the injury of common peroneal nerve, tibial nerve injury would lead less apoptosis of motor neurons.