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ObjectiveTo explore the effect of swimming on motor behavior and expression of brain derived neurotrophic factor(BDNF) and trkB in adrenal body.MethodsSD adult rats were divided into normal cotrol group and swimming group ( n=10 in each group).All rats in swimming group were subjected 6 weeks swimming for 1h each day.Motor performances including swimming speed and distance were recorded and expression of BDNF and trkB in adrenal body was measured.ResultsThere was a significant increase in swimming speed ( ( 157 ± 60) m/min) and distance ( (283.36 ±49.50)m) in swimming group,compared with control group ( (283± 60) m/min,( 156.92 ± 29) m) (P ＜ 0.05 ).Simultaneously,expression of BDNF in adrenal body had been significantly unregulated (0.93 ± 0.09 vs 0.56 ± 0.19 ) (P ＜ 0.05 ),while expression of trkB kept to be not changed.ConclusionSwimming increases notor ability in rats,and the possible mechanism may be related the upregulation of BDNF in adrenal body.
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ObjectiveTo explore the effects of Jinyaodai on neurological behavior and Akt expression in the cortex of rats following spinal cord contusion injury.MethodsRats were randomly divided into control group,spinal cord contusion group and Jinyaodai group.The weight-drop device was employed to prepare the spinal cord injury(SCI) model.Jinyaodai was administrated every day by using a stomach tube.Rats were performed the BBB assessment,and the detection of Akt expression and count of Neun positive neurons in cortex following SCI.ResultsCompared with control group,deficit of motor function in hindlimbs was seen at 3 dpo following cord contusion,and partial functional recovery could be seen from 7 dpo to 1 m.Treatment of Jinyaodai greatly increased the BBB scores ( 14.1 ± 1.4 ) more than SCI group ( 7.8 ± 1.3 ) at 1 month (P ＜ 0.05 ) ; Simultaneously,compared with SCI rats,treatment of Jinyaodai significantly increased the expression of Akt (0.53 ± 0.05,0.68 ± 0.07,P ＜0.05 ) and the number of neurons ( 11 ± 2, 15 ± 1 ; P ＜ 0.05 ) in the lesion-induced cortex of rats.Conclusion Jinyaodai may play an essential roles in functional recovery after spinal cord injury,in which the underlying mechanism may be involved in the expression of Akt in cortex.
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Objective To investigate the effect of NGF gene modified umbilical cord mesenchymal stem cells (UCMSC) transplantation on neurological functional improvement in traumatic brain rats. Methods Cerebral contusion model in motor-sensory cortex in rats was established by a weight hammer falling method. UCMSC were culutred and transferred with NGF gene. After NGF expression and activity was identified,the NGF gene modified UCMSC were engrafted into injured brain. The neurological function was evaluated 2 weeks after brain injury. And the NGF immunostaining was also performed to explore the level of NGF expression. Results Severe neurological dysfunction( 10.50 ± 0.53 )occurred in rats after traumatic brain injury, while the UCMSC transplantaion led to a significant functional improvement( 7.75 ± 0. 71 )(P ＜ 0. 01 ). Moreover, the best functional improvement was found in rats receiveing UCMSC grafts modified with NGF gene (5.38 ± 0. 52 ) (P ＜ 0.01 ). Conclusion NGF gene modified UCMSC transplantation can improve neural behavior in rats with brain trauma.
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Objective To explore the effect of brain derived neurtrophic factor(BDNF) gene modified umbilical cord mesenchymal stem cells ( UCMSC ) transplantation on neurological functional improvement in rats after brain trauma.Methods Cerebral contusion model in motor-sensory cortex in rats was established by a weight hammer falling method.UCMSC were cultured and transferred with BDNF gene.After BDNF expression and activity were determined,the BDNF gene modified UCMSC were implanted into traumatic brain.The neurological function was evaluated for 2 weeks after brain injury.And the BDNF expression was determined by using immunohistochemistry.Results Severe neurological dysfunction was seen in animals that had been subjected to contusion brain injury( 10.50 ±0.53 ).A significant improvement on neurological function was found in the UCMSC transplantaion animal( 7.75 ± 0.71 ), compared with only brain injury group (P ＜ 0.01 ).Moreover, rats in BDNF gene modified UCMSC showed the most behavior improvement ( 5.50 ± 0.76 ) (P ＜ 0.01 ).Conclusion BDNF gene modified UCMSC transplantation can survive and migrate, and improve neurological function in brain traumatic rats.
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Objective To explore the effects of hyperbaric oxygen (HBO) treatment on expression of extra-cellular signal regulated kinase 1/2 (ERK 1/2) and neurological function in acute traumatic brain injury (TBI) rats so as to offer trial support for clinical application of HBO in TBI.Methods Twenty-four adult Sprague-Dawley rats were randomly divided into sham-operation group,TBI group and HBO treatment group,with eight rats per group.The sham-operation group was free from TBI but skull was opened only but the TBI group was subjected to TBI according to Alice method.TheHBO treatment group was treated with HBO for 10 days ( one time per day) after TBI operation.On day 14,NSS rating was performed in all rats.Then,the rats were sacrificed and cortex of which was obtained to measure the expression of ERK1/2 by using reverse transcription-polymerase chain reaction (RT-PCR).The localization of the expression of ERK was detected by immunohistochemical staining and the changes in ERK protein was analyzed by optical density.Results The NSS score in the HBO group was significantly decreased at day 14 after HBO treatment ( P ＜ 0.01 ) and the expression of ERK1/2 in HBO group was also significantly decreased (P ＜ 0.05 ) in comparison with the TBI group.Conclusions HBO treatment can significantly decrease NSS score and expression of ERK1/2 in acute TBI rats,indicating that HBO may improve neurological function through down-regulating expression of ERK1/2.
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ObjectiveTo explore the effects of hyperbaric oxygen on neurological behavior and vascular endothelial growth factor (VEGF) in rats with traumatic brain injury (TBI). MethodsThirty rats were randomly divided into three groups, ie, control group, TBI group ( a 50 g weight-drop device was employed and fell from 30 cm height to induce the injury) and hyperbaric oxygen group ( HBO group,treated with hyperbaric oxygen once per day for seven days after TBI), 10 rats per group. Neurological severity score (NSS) was used to evaluate the movement and balance impairment in all groups. Expression of VEGF was detected by means of immunocytochemical staining.ResultsAfter TBI, the rats presented different degrees of convulsions, paralysis and balance dysfunction. The NSS score was (5.6 ±1.1 ) points in the TBI group and (0.3 ± O. 1 ) in the control group, with statistical difference ( P ＜0.05). While NSS score was (3.7 ± O. 7) points in the HBO group, showing a significant decrease compared with that in the TBI group (P ＜ 0. O1 ). Immunohistochemical staining showed 15 ± 3 positive neurons of VEGF in the TBI group, significantly less than 27 ± 2 in the control group ( P ＜ 0.05 ). There were 21 ±2 positive neurons of VEGF in the HBO group, significantly less than 21 ±2 in the TBI group (P ＜0.05). Conclusion Hyperbaric oxygen may attenuate experimental traumatic brain injury by stimulating production of VEGF.
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ObjectiveTo explore the effects of bone morrow stromal cells (BMSCs) on the neurological behavior of rats with traumatic brain injury (TBI).MethodsTwenty-four SD rats were randomly and equally divided into control group, TBI group and BMSC group. The weight-drop device was adapted to establish the TBI model. The injury severity and its outcome were evaluated by a set of criteria termed neurological severity score (NSS). Brain tissues were harvested at day 14 to observe the survival and migration of the transplanted cells.Bax expression was detected by RT-PCR. Results NSS was (12 ±3 ) points in the TBI group, significantly higher than (7 ± 1 ) points in the BMSC group (P ＜0.05). The transplanted BMSCs could survive and migrate. Moreover, BAX, a crucail apopotosis gene, was down-regulated to 0.9 ±0.1 in the BMSC group, compared with 1.1 ±0.2 in the TBI group (P ＜0.05). ConclusionsBMSC transplantation is available to improve the neurological function, as may be associated with the Bax.
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Objective To observe olfactory ensheathing cells transplantation on brain injury recovery nerve function and to explore its mechanism. Methods After purification of the olfactory ensheathing cells cultured for NGFRp75 immunocytochemical identification and preparation of cell suspension for transplantation, some cells were pre-labeled for bservation of survival after transplantation. 48 adult SD rats were randomly divided into three groups:sham operation without injury group (A group),cerebral cortex motor area injury group (B group) , the same brain injury and the olfactory ensheathing cell transplantation group (C group). At postoperative day,3 d, 7 d,14 d the neurological severity score (NSS) of rats were assessed; 14 d after injury of brain tissues were taken for NeuN immunohistochemistry host the number of neurons change. The data were statistically analyzed using SPSS17.0 software. Results (1) Cultured olfactory ensheathing cells showed NCFRp75 positive,the positive rate was 90%. (2) 14 d after transplantation of nuclear fluorescence labeling of olfactory ensheathing cells survived well in the host body. (3) 14 d after NSS score of B group( 2.00 ± 0.53) and C group ( 1.25 ± 0.46) were significantly better than the B group (P<0.05). (4) NeuN positive cells in B group (39.2 ±7. 1) and C group(45, 8 ± 6.0) were significantly better than B group (P<0.05). Conclusions Olfactory ensheathing cell transplantation can promote the recovery of neurological function in rats brain injury,which may be related with olfactory ensheathing cells to promote neuron survival in the host.
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Objective To investigate the role of precursor of brain derived neurotrophic factor (proBDNF) in the improvement of motor function of rats subjected to cord transection. Methods Spinal cord transection was performed at T10 level. The rats were divided into sham operation group and artificial cerebrospinal fluid group. Then, the rats were subjected to proBDNF antibody treatment. The efficiency of proBDNF block was also determined by immunohistochemistry. BBB scale scores were used to e-valuate the effect of ProBDNF block on the motor function of the rats with spinal cord transection. Results Compared with control rats, proBDNF treatment showed a marked down-regulation of proBDNF protein in the spinal cord and could significantly improve the motor function. BBB scores in proBDNF block group was higher than those in artificial cerebrospinal fluid group. Conclusion The proBDNF block is available to the recovery of the motor function in hindlimbs in cord transected rats, suggesting that proBDNF could be as a member of candidate molecules for SCI therapy in the future.
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Objective To research the effects of neural stem cells (NSCs) transplantation on the neurological function improvement and neural survive and axonal regeneration in traumatic rat brain. Methods NSCs were cultured in vitro, labeled with hochest and transplanted into rat brain injured area by weight-dropping. Neurological severity scores(NSS) tested the functions at the 0,3,7,14 day post-injury. Immunofluorescence was used to detect the expressions of NeuN cells and GAP-43. Results There was significant difference in NSS between NSCs transplantion group and brain injury group(4.38 ±0.74 vs 5.50 ± 1.07, P＜0.01) at 7th day. There were a significant increase in neural number (51.46 ± 3. 303 vs 42.83 ± 5. 401, P ＜ 0.01 ) ), and GAP-positive axons ( 13.3 ± 1.7 vs 8.7 ± 1.1, P＜0.01 ) in NSCs transplantion group than in control group. Conclusion NSCs have an effects on the neurological improvement in brain injured rat. This may be associated to the increase in number of the neurons and local axons.