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Objective To observe the effect of curcumin on behavior,blood brain barrier(BBB)and ex-pression of glial fibrillary acidic protein(GFAP)and cyclic nucleotide 3′phosphohydrolase(CNPase)in hippocam-pus of radiation injured brain(RIB)rats. Methods SD rats were divided into radiation group,treatment group and negative control group. RIB rats model were established by X ray,and rats in treatment group were treated by curcumin. Morris water maze test were taken to study learning memory of rats in each group. The expression of Ev-ans blue(EB)in brain tissue and the expression of GFAP and CNPase in hippocampus were detected to observe the effect of curcumin on the BBB of RIB rats. Results In RIB rats,learning memory were decreased significant-ly,permeability of BBB were increased. GFAP expression in brain tissue was increased,and CNPase was de-creased(P < 0.05). After the treatment of curcumin,learning memory of rats were improved,the permeability of BBB was decreased,GFAP was decreased,and CNPase expression was increased(P < 0.05). Conclusion Cur-cumin can significantly reduce the damage of BBB in RIB rats,decrease the expression of GFAP and increase the expression of CNPase in hippocampal,which indicate that curcumin has curative effect on radiation injured brain.
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Objective To study the effects of butylphthalide on cognitive function,apoptosis and pp38MAPK in hippocampus of rat model of vascular dementia.Methods The vascular dementia (VD) model was established by two vascular (2VO) method,and then sixty male Wistar rats were randomly divided into VD group,sham operation group and NBP (butylphthalide) group.Rats in NBP group were given 120 mg · kg-1 · day-1 dose butylphthalide by gavage,and rats in VD group and sham operation group were given the same dose vegetable oil.The cognitive function of each rat was tested by Morris water maze.The expression of p-p38MAPK in the hippocampus was observed by Western blot;and the apoptosis was observed in hippocampal CAl region by TUNEL staining.Results The hidden platform escape latency of NBP group ((48.72 ± 7.01) s,(42.41 ± 4.06) s,(40.34 ± 2.46) s)was significantly shortened compared with those of VD group((82.71±8.27) s,(80.36±9.65) s,(77.74±6.33) s)(P＜ 0.01) ; and the former platform quadrant time and the number of passing through the platform of NBP group ((26.45±4.66)s,(1.84±0.82) times) were significantly prolonged (P＜0.01) compared with those of VD group ((18.67±5.39) s,(1.32±0.61) times);the apoptosis and the expression of p38MAPK phosphorylation in hippocampus in NBP group ((153.65±9.85),(0.42±0.04)) significantly reduced (P＜0.01) compared with those of VD group ((209.46±11.49),(0.88±0.10)).Conclusion Butylphthalide can improve the learning and memory ability of VD rats,the reduce apoptosis in the hippocampus by the inhibition of the P38MAPK pathway.This may be one of the ways by which butylphthalide can treat vascular dementia.
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Objective To observe the effects of exogenous basic fibroblast growth factor (bFGF) on radiation-induced apoptosis of C17.2 neural stem cells (NSCs) with γ-secretase inhibitor (DAPT) condition and explore the relationship between bFGF and Notch signal pathway.Methods The cell viability was detected by using the MTF method.After the cells attached to the flasks,different concentrations of DAPT was added in accordance with the experimental design and cultured cells for 24 h.C17.2 NSCs were subjected to irradiation exposure by linear accelerator and treated with bFGF (40 ng/ml) 5 min after the exposure.After 48 hours,the apoptosis of cells was detected by using Flow Cytometry.Results After adding in DAPT,the cells growth was inhibited and depended on the concentrations of DAPT.Compared with the control group,all groups had statistically significant differences(P＜0.05).Flow cytometry showed compared with the control group all groups had significant differences (P＜0.05).The apoptosis rate was (11.53±0.81)％ in radiation group,(7.18±0.0.94)％ in radiation+bFGF group,(9.82±0.77) ％ in DAPT group,(21.45±0.98) ％ in Radiation+DAPT group and (10.26+ 1.03) ％ in Radiation+ DAPT +bFGF group.Between Radiation + bFGF group and Radiation group,it had statistically significant difference(P＜0.05).The pairwise comparisons of DAPT group and Radiation + DAPT group which had the same DAPT concentration had statistically significant differences (P＜0.05).The pairwise comparisons of Radiation + DAPT+bFGF group and Radiation + DAPT group which had the same DAPT concentration had statistically significant difference(P＜0.05).Conclusion Fx ogenous bFGF can inhibit apoptosis of C17.2 NSCs.Notch signaling patbway inhibitor DAPT can promote apoptosis of C17.2 NSCs which are subjected to irradiation exposure by linear accelerator and bFGF can weak apoptosis.bFGF protective effect on radiation-induced neural stem cells may be related to the Notch signaling pathway.
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Objective To observe the effect of basic fibroblast growth factor (bFGF) gene therapy on astrocytes glial fibrillary acidic protein (glial fibrillary acidic protein,GFAP) and vimentin (Vimentin,VIM) protein expression of astrocytes in rats with whole brain radiation brain injury (RIB) in order to provide an experimental basis for exploring new ways to treat RIB.Methods Sprague-Dawley rats were grouped and received single 25Gy for whole brain irradiation to established brain radiation injury (radiation injuries of the brain,RIB) model,bFGF gene therapy groups were given intracerebroventricular injection of bFGF-pcDNA3.1 (±) plasmid and set non-irradiated group as control.Before irradiation and post-irradiation 20 d and 60 d,respectively,GFAP and VIM expression were observed in each group of brain tissue.Results Radiation group with pathological examination showed mild degeneration of hippocampal and cortical neurons,and white matter regions presented the organizational structure comb loose and perivascular space enlargement compared with the control group.But the bFGF treatment group was significantly lighter.The expression of GFAP were increased in each group after radiation.GFAP positive cells of bFGF treatment group (65 ±6.2) were higher than that of irradiation group (49 ±5.8) and control group (18 ± 2.4) (P ＜ 0.05) at 20 d.GFAP positive cells at 60 d in bFGF treatment group (44 ± 5.1) were significantly reduced (P ＜ 0.05) than at 20 d and there were no significant difference (P ＞ 0.05) in the other groups between 20 d and 60 d.VIM expression of bFGF treatment group was higher at 20 d (0.94 ±0.12) compared to irradiated group (1.45 ± 0.26) and no significant difference of VIM expression was found in each groups at 60 d.Conclusion Irradiation with 25Gy-ray can increase the expression of GFAP and VIM in rats brain at acute phase,bFGF gene therapy can increase the expression of GFAP and decrease the expression of VIM.
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ObjectiveTo study the effects of dl-3n-butylphthalide on study and memory abilities and hippocampus expression of MMP-9 in rat model of radiation injuries of brain.MethodsWistar rats were divided into radiation group radiated by linear accelerator and control group.Morris water test were taken to study the learning and memory ability of rats in each group before irradiation and 120 d after irradiation.ResultsMorris water maze test results showed that:in the academic test,compared with model group,high-dose butylphthalide group and low dose butylphthalide group had significantly shorter escape latency( (79.61 ± 7.17 )s,(43.64 ± 4.72)s,(42.15 ±4.19 ) s) and decreased number of errors ( 36.43 ± 6.59,14.58 ± 4.22,13.66 ± 3.91 ) (P ＜ 0.01 ).In the memory test,compared with model group,high-dose butylphthalide group and low dose butylphthalide group had significantly longer the former platform quadrant time respectively (30.09 ± 3.68 ) s,( 31.25 ± 3.17 ) s vs ( 17.57 ±4.29) s and faster swimming speed respectively (P ＜ 0.01 ).ConclusionButylphthalide can significantly reduce hippocampal neurons expression of MMP-9,which indicates that butylphthalide has curative effect on radiation brain injuries by regulating the expression of MMD-9.
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Objective To investigate the effect of 3-n-butylphthalide (NBP) on learning and memory abilities in vascular demensia (VD) rats. Methods VD model rats was established by two-vessel method. 60 3-month-old Wistar male rats were randomly divided into VD group, sham-operate group and NBP group. Rats in NBP group were given NBP 120 mg · kg-1 · d-1 ,VD and sham-operate group were given equal quality vegetable oil.Morris water maze was used to assess the learning and memory abilities in each group and HE staining was used to observe the hippocampus morphology of the rats. Results The escape latency in hidden plat test was( (38.34 ±2.46 ) s, ( 14.83 ± 3.77s ), ( 75.74 ± 6.33 ) s ) and the original platform quadrant time was ( ( 26.45 ± 4.66 ) s,(35.21 ±3.78)s, ( 18.67 ±5.39)s) in NBP group,sham-operate group and VD group respectively. Compared to VD group, NBP group had obviously decreased escape latency in hidden plat test, increased original platform quadrant time and distinctly decreased the necrosis of the neurons in HE dyeing. Conclusion NBP can improve the learning and memory deficits in VD rats.
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Objective To study the changes of learning-memory ability and synapse of hippocampus after radiation injuries. Methods Sprague-Dawley rats were grouped according to radiation dose to 20Gy group,30Gy group radiated by linear accelerator and control group were used before radiation and 120 days after radiation. Morris maze test were taken to study the learning and memory ability of rats in each group. Average escape latency and search strategy were scaled and analyzed in each group. The parameters of synapse in CA3 area of hippocampus were studied by using electron microscope and image analyzer. Results AEL of 20Gy group was (41. 17 ±10.76 ) s and score of SS was 27.13 ± 2.34 after 120 days' radiation but AEL of 30 Gy group was (78.49 ± 9.32)s and the score of SS was (23.19 ± 7.65 ) nm. There were significant statistic differences Compared with control group and before radiation (P ＜ 0.05 ). The thickness of PSD of 20 Gy group was ( 22.03 ± 6.84 ) nm after 120days' radiation and (23.19 ± 7.65 )nm in 30 Gy group. There were significant statistic differences compared with control group and before radiation. It was observed that both in 20 Gy and 30 Gy group' s the length of synaptic activity area was shorter,the curvature of synaptic interface was smaller,the width of synaptic cleft and the thickness of PSD was narrower than that of control group. Conclusion There was close relation between the changes of learning-memory ability and synapse of hippocampus after radiation injuries.
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OBJECTIVE To study the characteristic of nosocomial pulmonary infection to find out the measures for prevention and control.METHODS The patients with radiation brain injuries(RIB) from Oct 2004 to Jun 2007 underwent retrospective investigation.The reasons and sites of pulmoary infection were analyzed.RESULTS The incidence of pulmonary infection of patients with RIB after radiotherapy was 68.5%.Major factors of infection were bulb palsy,invasive treatment and hormone usage.The Gram-negative bacteria were the predominant pathogens.CONCLUSIONS The nosocomial pulmonary infection is related to many factors.Antibiotic usage according to drug susceptibility results and controlling of the risk factors are important measures to reduce the rate of infection.