Objective To explore the long-term health effects of overexpose to radiation.Methods The 32 -41-year medical followed-up observations were performed for 25 persons exposed to ionizing radiation in the dose range of 0.10 -0.33 Gy. Observations were made of clinical symptom,eye lens,cytogenetics,immune function and endocrine function for these persons. Results The incidence of neurasthenic symptom was higher in exposed group than that in control group.2 cases suffered from liver cancer and esophageal cancer,respectively. Posterior capsule punctate phacoscotasmus of the lens wereobserved in 7 cases.There was I case of cataract in the exposed group. The frequencies of chromosomeaberration and micronucleis in peripheral blood lymphocyte in the exposed group were significantly higherthan those in control group (x2 =8.88,8.71,40.60,45.63,P ＜ 0.05 ).The average value of serum IgG was higher(t =2.16,P ＜0.05 ),while that of IgM was obviously lower in the exposed group (t =2.03,P ＜0.05).The average values of serum triiodothyronine (T3),thyroxine (T4 ) and thyroid-stimulating hormone (TSH) in the exposed group were obviously lower than those in the control group (t =2.40,3.54,2.13,P ＜0.05 ).Conclusions Overexposure has effect on lens,immune function,cytogenetics to some degree.It is important to observe the long-term health effect on overexposed persons.

Objective To investigate the neuroprotective effect of escitalopram on focal cerebral ischemia/reperfusion in rats and its possible mechanisms.Methods Seventy-five male Sprague-Dawley rats were randomly divided into three groups:sham operation,saline control and escitalopram intervention groups (n =25 in each group).A focal cerebral ischemia reperfusion model in rats was induced by the intraluminal suture method.The modified neurological severity scale was used to evaluate neurological deficit in rats (n =5 in each group).Laser confocal technology was used to observe the microvascular diameter,density,and total area in ischemic region (n =5 in each group).Enzyme-linked immunosorbent assay was used to detect the plasma concentration of vascular endothelial growth factor (VEGF) (n =5 in each group).Immunohistochemical staining (n =5 in each group) and Western blotting (n =5 in each group) were used to detect the expression of VEGF in the ischemic brain tissue.Results At day 14 after modeling,the neurological deficit improved more significantly in the escitalopram intervention group than that in the saline control group (4.39 ±0.92 vs.6.57 ± 1.13; P =0.015).The 3D confocal vascular imaging showed that capillary diameter in the escitalopram intervention group was significantly smaller than that in the saline control group (2.93 ± 0.19 μm vs.3.56 ± 0.22 μm; P ＜0.01); the vascular density was significantly higher than that in the saline control group (232.68 ±12.54/0.002 mm3 vs.176.26 ± 10.87/0.002 mm3; P=0.000); the total microvascular area was significantly greater than that in the saline control group (89 154± 3 298 μm2/0.002 mm3 vs.75 368.14± 3 519 μm2/0.002 mm3; P=0.000).Enzyme-linked immunosorbent assay showed that the plasma VEGF concentration in the escitalopram intervention group was significantly higher than that in the saline control group (50.35 ± 5.44 pg/ml vs.13.75 ± 4.12 pg/ml; P =0.000).Immunohistochemical analysis showed that the VEGF expression in ischemic brain tissue in the escitalopram intervention group was significantly higher than that in the saline control group (P =0.000).Western blotting showed that the VEGF expression in ischemic brain tissue in the escitalopram intervention group was significantly higher than that in the saline control group (0.94 ±0.18 vs.0.62 ±0.22; P =0.006).Conclusions Escitalopram may reduce neurological deficit in cerebral ischemia/reperfusion in rats.Its mechanisms may be associated with VEGF-mediated angiogenesis.

Objective To observe late effect of 60Co radiation accident on eye lens in the victims.Methods Medical observations of eye lens were performed on ten victims accidentally exposed to 60Co sources in four radiation accidents that have occurred from 1986 to 2000 in Henan Province.Pathological changes of the eye lenses were examined by using slit lamp microscopy after mydriasis with compound tropicamide.Results Of these ten victims, Liang in a radiation accident in Kaifeng (in 1986), Mei in Xinxiang (in 1999) and Xu in Xuchang (in 2000) all had typical radiation-induced cataract 2, 3 and 6 years after irradiation, respectively.Follow-up observation of the lens showed the punctate and/or granular opacities present in the eye posterior subcapsular of Yan in Kaifeng accident, Jie in Zhengzhou (1987), and Tian, Yong and Yi in Xinxiang accident, featuring the early changes of radiation-induced cataract, but the posterior subcapsular opacities were not observed in Wang and Min in Xinxiang accident.Conclusions Focus should be on the eye lens as the target organ of radiation exposure in long-term follow-up of victims accidentally exposed to radiation source.Severity of the lens opacity induced by ionizing radiation is closely associated with radiation doses.

Objective To investigate the effect of wogonin on ethology and its possible mechanisms in chronic cerebral ischemia in rats.Methods Rats were randomly divided into a sham operation group,a wogonin intervention group,and a phosphate buffered solution (PBS) control group.A rat model of chronic cerebral ischemia was induced by the two-vessel occlusion method.Six weeks after modeling,the rats in the wogonin intervention group and the PBS control group were intragastric administrated with wogonin (50 μmol/L,10 ml/kg,once a day) and PBS with equal volume for 14 days.Morris water maze test was used to evaluate the spatial learning and memory function.Laser confocal three-dimensional vascular imaging was used to detect the vascular proliferation of ischemic brain tissue.5-Bromo-2-deoxyuridine (BrdU)immunochemical staining was used to detect the cell proliferation in ischemic brain tissue.Transmission electron microscope was used to observe the morphological changes of neural cells in cerebral ischernic region.Results The Morris water maze (n =8) showed that the trains of escape latency from the second to the fifth day in the wogonin intervention group were 43.45 ± 8.64 s,37.12 ± 1.31 s,34.75 ± 5.36 s,and 24.36 ± 5.43 s,respectively.They were significantly shorter than 51.69 ± 5.32 s,43.65 ± 9.21 s,50.19 ± 10.31 s,and 53.65 ± 7.15 s in the PBS control group (all P ＜ 0.05).The first quadrant swimming time of the wogonin intervention group was significantly longer than that of the PBS control group (26.16 ±3.29 s vs.14.38 ±2.16 s; P＜0.01).Laser confocal three-dimensional vascular imaging (n=4) showed that the capillary inner diameter in cerebral ischemia region of the wogonin intervention group was reduced significantly compared to the PBS control group (3.02 ±0.21 μm vs.3.35 ±0.18 μm; P ＜0.05),vascular density was increased significantly (205.80 ± 12.70/0.002 mm3vs.158.42 ± 10.92/0.002 mm3; P＜0.01),and total microvascular area was increased significantly (83 389 ± 4 026 μm2/0.002 mm3 vs.73 349 ±3 986 μm2/0.002 mm3; P＜0.01).Immunohistochemical staining (n =6) showed that the number of BrdU positive cells in the ischemic brain tissue of the wogonin intervention group was increased significantly compared to the PBS control group (24.62 ±3.25/HPF vs.9.87 ±2.89/HPF; P＜0.01).The observation of transmission electron microscope showed that the inflammatory edema in the intercellular spaces of the wogonin intervention group was significantly reduced compare to the PBS control group.Conclusions Wogonin can significantly improve the spatial learning and memory ability of chronic cerebral ischemia in rats,and its possible mechanisms may include the promotion of proliferation and angiogenesis in ischemic region and angiogenesis,and reduce inflammatory response.

Objective To explore the clinical features of patients with vertebrobasilar dolichoectasia (VBD).Methods Patients diagnosed with posterior circulation ischemia in our hospital from October 2008 to January 2012 were consecutively collected and were divided into the VBD group and the non-VBD (NVBD) group.Clinical manifestations,risk factors,hemodynamic parameters and neuroimaging features were collected.Results (1) Statistical difference was observed in dyslipidemia,hypertension and the history of diabetes in the two groups (P ＜ 0.05).(2) The cerebral hemodynamic features of the VBD patients were as the following:decreased peak systolic velocity of vertebral artery and basilar artery and decreased systolic/diastolic ratio.Statistical difference was showed in the average peak flow velocity(Vm),pulsatility index(PI) and resistance index(RI) (P =0.036,0.032,0.032,respectively).(3) The main clinical manifestations of VBD were ischemic cerebrovascular disease,hemorrhagic cerebrovascular disease,oppression,brain damage symptoms and hydrocephalus.(4) The diagnosis in most of the VBD patients was confirmed by neural imaging and MRI was the first choice.Conclusion The VBD patients have relative unique clinical features.MRI should be the first choice for neuroimaging.

Objective To screen the altered gene expression profile of hippocampus after traumatic brain injury(TBI)in rats. Methods Rats(n=3)in experimental group underwent moderate fluid-percussion(F-P)brain injury and the hippoeampus sample in the injured hemisphere was removed and conserved in liquid nitrogen three hours later.The rats(n=5)of the control group underwent the same procedure except for injury.Mfymetrix rat genome 230 2.0 array was used to detect the gene expression profile of hippocampus in two groups and find the altered gene expression profile. Results A total of 159 genes in the experimental group changed significantly(≥2 folds)compared with the control group,of which 136 genes were up-regulated and 23 genes down-regulated. Conclusions The significant gene expression changes of hippocampus,especially a large mount of up-regulated genes,are detected after moderate TBI in rats,suggesting that the secondary injury following TBI is a procedure involving multiple factors.

Objective To set up a rat model with acute traumatic coma and identify the variation of microRNA in mesencephalon. Methods After rats were injured moderately by central fluid percussion system, tissues of the mesencephalon were removed one hour after injury. RNA of brain tissue of the mesencephalon was isolated for microRNA array by using the exiqon microarray system. The data were analyzed statistically by Genepix Pro 6.0 after hybridization results were scanned and fluorescence intensity standardized. Resets Hybridization results showed 33 microRNAs with up-regulated expressions but 38 microRNAs with down-regulated activity. Conclusion Expression of microRNA array shows marked changes in the tissues of the mesencephalon in rats with traumatic coma, as may be injury mechanism of traumatic coma and also a way of neurobiological protection of coma.

Objective:To explore the changes of cerebral blood flow (CBF) perfusion caused by N 2O (laughing gas) abuse. Methods:From December 2017 to October 2018, the CBF perfusion images of 24 patients with laughing gas abuse (9 males, 15 females; age: 18-32(24.0±8.9) years) from China-Japan Friendship Hospital were analyzed retrospectively. The region uptake statistics of different brain regions of interest (ROI) (basal ganglia, central region, cerebellum, cingulate gyrus, frontal lobe, medial temporal lobe, occipital lobe, parietal lobe, temporal lobe) between patients with laughing gas abuse and normal people of the same age group from background software database were calculated automatically. Statistic>1.68 indicated the increase of local CBF perfusion, while statistic < -1.68 indicated the decrease of local CBF perfusion. The correlation between the statistics of bilateral brain regions and the correlation between statistical values and clinical indicators were analyzed by Pearson and Spearman correlation analyses.Results:The correlation of the statistics between bilateral regions of each brain area was significant( r values: 0.503-0.892, all P<0.05). The decreased CBF proportions of frontal and temporal lobes were 62.5%(15/24) and 70.8%(17/24), respectively. The highest proportion of increased CBF was cingulate gyrus (33.3%, 8/24). There were significant correlations between frontal lobe, central brain area and duration of laughing gas abuse ( rs values: 0.375, 0.305, both P<0.05). Conclusion:CBF perfusion imaging is helpful for understanding the changes of CBF in patients with laughing gas abuse.

Objective:To understand the molecular pat hophysiology of hepatocellular carcinoma and pancreatic cancer.Methods: We studied novel gene expression by cDNA microarray method. The PCR pro ducts of 4 096 genes and 12 800 gene were spotted onto a kind of chemical-mater ial-coated-glass slide in array. Both the mRNAs from 5 cases of hepatocellular carcinoma and 3 cases of pancreatic cancer were reversely transcribed to cDNAs with the incorporation of fluorescent-labeled dUTP to prepare the hybridization probes. After hybridization, BioDoor4096 and BioDoor12800 cDNA microarray were scanned for the fluorescent intensity. Tumor invasion-related gene expression w as screened through the analysis of difference in gene expression profile.Results:Among 4 096 and 12 800 target genes, there were 15 genes who se expression level differed from normal and carcinoma tissues. Therefore, they might be associated with metastasis.Conclusion:Further analysis of these differentially expressed metastasis-associated genes will be helpful for understanding the molecular mechanism of malignant carcinoma.

Objective:To investigate the role of pleiotrophin (PTN) gene in carcino genesis using cDNA microarray and in situ hybridization. Methods:The expression of PTN gene in 5 cases of glioma, 10 laryngeal squamous cell carcinoma, 6 cases of hepatocarcinoma, and normal controls were detected by BioDoor 4096 type cDNA microarray and in situ hybridization. Results: The expression of PTN gene in carcinoma samples were significantly higher than in normal controls by cDNA microarray, the results was the same as by in situ hybridization. Conclusion: cDNA microarray is an effective technique in analysis of functional study of associated genes in carcinoma. High expression of PTN gene might be correlated with mechanism of multiple carcinoma. [