Objective To examine the age-related morphological changes in hair cell nuclei,and explore the death modes of cochlea hair cells in aged rats.Methods Thirty-two Wistar rats were used in present experiment.The animals were assigned to one of the two groups,rats in aged group(n=20)were 22-23 months of age,and those in young group(n=12)were 2-3 months of age.The auditory brainstem response(ABR)thresholds of both ears elicited with tone bursts at 4,10 and 20 kHz were measured in both young and aged Wistar rats.Upon completion of the auditory test,animals were decapitated and both left and right bullae were exposed.Following fixation,whole specimens comprising the basilar membrane with Corti's organ were separated from the modiolus.Propidium iodide(PI),a popular DNA intercalating fluorescent probe,was used to trace the morphological changes in cochlea hair cell nuclei in the aged rats.Each Corti's organ was thoroughly inspected from the apical to the basal turns of cochlea with fluorescence microscopy.According to the morphological changes in the nuclei,the death modes of cochlea hair cell were determined.Results There were significant differences on ABR thresholds(P=0.001)at all tested frequencies between the young and aged rats.Three types of cochlea hair cell pathology appeared in the aged rats,including karyopyknosis,nuclear swelling and denucleation.A large number of loss or degenerated hair cells were present in the apical and basal end of cochlea in aged rats.Conclusion The present study indicates that apoptosis and necrosis are the death modes of cochlea hair cells in aged Wistar rats.

To explore the mechanism of therapeutic effect of basic fibroblast growth factor (bFGF) in the treatment of blast-induced deafness, and to define its optimal clinical use, bFGF was infused into the guinea pig's cochlea, combined with intramuscular injection of bFGF after being exposed to explosion. The compound action potential (CAP) and auditory brainstem response (ABR) were measured in these animals. 125I labeled basic fibroblast growth factor ( 125I -bFGF) was injected intraperitoneal to the guinea pigs to observe whether it could pass through the blood-labyrinthine barrier. The results showed that bFGF infused to the cochlea might facilitate recovery of hearing loss following acoustic trauma. Basic fibroblast growth factor ( 125I -bFGF) intraperitoneally injected, could not pass through the blood-labyrinthine barrier. However intramuscular bFGF promoted the recovery of hearing, probably indirectly through the neuro-immunity network.

Objective To investigate the appropriate range of gestational weight gain in pregnant women with abnormal glucose metabolism.Methods A retrospective study was conducted on 661 term singleton pregnant women with gestational abnormal glucose metabolism,who delivered in the Department of Obstetrics and Gynecology of Peking University First Hospital from Jan.2005 to Dec.2007,by reviewing the medical records.All sujects were divided into 4 groups according to their body mass index (BMI) before pregnancy:group Ⅰ (n=40):BMI<18.5;group Ⅱ (n=400):BMI18.5-23.9;group Ⅲ (n=162):BMI 24.0-27.9;group Ⅳ (n=59):BMI≥28.0.The weight gain among different groups and that between women who delivered normal birth weight infant and maerosomia were analyzed.The weight gain of pregnant women who delivered babies weighing 3000～3500 g in each group was determined as the appropriate weight gain for that group.Results The same results were achieved that the weight gain in pregnant women who delivered macrosomia was significantly higher than those who delivered normal birth weight newborns in each group,ie,the weight gains for women who had macrosomia and normal birth weight infants were (17.0±5.2) kg and (14.1±4.7) kg in group Ⅱ,(16.8±7.3) kg and (11.9±5.1) kg in group Ⅲ and (18.3±6.7) kg and (11.2±5.4) kg in group Ⅳ,respectively (P<0.05).The appropriate ranges of weight gain for each group were (15.6±3.3) kg,(14.0-18.0) kg for group Ⅰ,(13.9±4.6) kg,(11.0-16.5) kg for group ]],(11.5±5.2)kg,(9.0-15.0) kgforgroup Ⅲ,(10.1±2.9) kg,(7.0-12.7) kg forgroup Ⅳ.Conclusions Appropriate weight gain based on prepregnant BMI,together with glucose monitoring in women with gestational abnormal glucose metabolism,is helpful for fetal weight control.

Objective To investigate the influencing factors of neonatal birth body mass in women with abnormal glucose metabolism during pregnancy. Methods A study was conducted on 1157 singleton gravidas, who were diagnosed and treated for abnormal glucose metabolism and delivered in the Department of Obstetrics and Gynecology, First Hospital, Peking University from January 2005 to December 2009, by reviewing the medical records. Based on the pre-pregnant body mass index, the selected cases were divided into 4 groups: low body mass group [ body mass index (BMI) ＜ 18.5 kg/m2, n =53], ideal body mass group ( BMI 18.5 - 23.9 kg/m2, n = 647 ), over body mass group ( BMI 24.0 - 27.9 kg/m2, n = 323 ),and obese group (BMI≥28.0 kg/m2, n = 134). 1157 newborns were divided by birth body mass into 3 groups: normal birth body mass group (body mass 2500 -4000 g, n =987), of which 545 cases of birth body mass 3000 -3500 g for the appropriate newborns, macrosomia group (body mass≥4000 g, n = 112);low birth body mass group (body mass ＜ 2500 g, n = 58 ). The following information was collected,including pre-pregnancy body mass, height, gestational age of diagnosis and body mass gain after diagnosis,maternal serum level of cholesterol, history of adverse pregnancy, and family history of diabetes, gestational age, delivering body mass, neonatal birth body mass. The influence of pre-pregnant BMI, body mass gain during pregnancy, gestational age of diagnosis, body mass gain after diagnosis, maternal serum level of cholesterol, family history of diabetes on the newborns' birth body mass was analyzed. The appropriate ranges of gestational body mass gain were calculated in women with abnormal glucose metabolism. Results ( 1 )The average neonatal birth body mass for each group respectively were (3142 ±333) g for low body mass group, (3339 ±476) g for the ideal body mass group, (3381 ±581) g for over body mass group, and (3368 ± 644) g for obese group. The neonatal birth body mass was increasing with maternal pre-pregnant BMI, and average birth body mass of the newborns in low body mass group was lower than other 3 groups,respectively, the difference was statistically significant ( P ＜ 0.05 ). The difference was not statistically significant ( P ＞ 0.05 ), when it was compared among the obese group, ideal weight group and over body mass group. (2)The body mass gain during pregnancy in women delivered normal birth weight newborn and delivered macrosomia for each group respectively were ( 13.5 ±4.5 ) and ( 17.1±5.4) kg for the ideal body mass group, ( 11.6 ± 4.9 ) and ( 15.3 ± 6.4 ) kg for the over body mass group, ( 10.3 ± 5.0) and ( 14.7 ±7.4) kg for the obese group. The difference was statistically significant in 3 groups (P ＜ 0.05 ). The difference of body mass gain during pregnancy in women delivered normal birth weight newborn and delivered macrosomia for low body mass group could not be compared statistically, because of only 1 case delivered macrosomia. (3)The gestational age of diagnosis in women who delivered normal birth weight newborn and macrosomia for the ideal body mass group respectively were ( 27.8 ± 5.8) and ( 29.8 ± 5.3 ) weeks, the difference was statistically significant ( P ＜0.05 ). The gestational age of diagnosis in gravidas who delivered normal birth weight newborn and macrosomia for the over body mass group respectively were ( 26.7 ± 6.8)and (30.2 ± 4.1 ) weeks, the difference was statistically significant ( P ＜ 0.05 ). The gestational age of diagnosis in women who delivered normal birth weight newborn for obese group was (26.2 ± 7.5 )weeks, less than that of pregnant women who delivered macrosomia [ ( 25.7 ± 9.3 ) weeks ], but the difference was not statistically significant (P ＞ 0.05 ). The difference of the diagnosed gestational age for low body mass group could not be compared statistically, because of only 1 case delivered macrosomia. (4)Tbe serum triglyceride (TG) levels of pregnant women who delivered macrosomia was (3.1 ± 1.5) mmol/L, higher than that of pregnant women who delivered normal birth weight newborn [ (2.7 ± 1.2) mmol/L], and the difference was statistically significant (P ＜ 0.01 ). The serum high density lipoprotein cholesterol (HDL-C) levels of pregnant women who delivered macrosomia was ( 1.4 ± 0.3 ) mmol/L, lower than that of pregnant women who delivered normal birth weight newborn [( 1.7 ±0.9) mmol/L], and the difference was statistically significant (P＜0.01). The serum low-density lipoprotein cholesterol (LDL-C) and cholesterol level of pregnant women who delivered macrosomia respectively was ( 2.8 ± 0.8 ) and ( 5.4 ± 1.1 ) mmol/L, less than those of pregnant women who delivered normal birth weight newborn [ (3.0 ±0.9) mmol/L and (5.6 ±1.1) mmol/L], but the difference was not statistically significant (P ＞0.05). (5)The final regression model of variables into the top three were pre-pregnant BMI, body mass gain during pregnancy and maternal serum level of HDL-C, when analyzing the related factors of affecting neonatal birth body mass with multiple logistic regression analysis such as age, history of adverse pregnancy, family history of diabetes, prepregnancy BMI, body mass gain during pregnancy and after diagnosis of abnormal glucose metabolism,maternal serum level of cholesterol, abnormal glucose metabolism categories, gestational age and other factors ( P ＜ 0.01 ). Conclusion Pre-pregnant BMI, body mass gain during pregnancy and maternal serum level of HDL-C may affect the neonatal birth body mass whose mothers were complicated with abnormal glucose metabolism during pregnancy.

Primary immune thrombocytopenia ( ITP) is an organ-specific autoimmune hemorrhagic disease. The etiology of ITP is still unclear, but loss of immune tolerance to platelet surface antigens is con-sidered as a fundamental cause of ITP. Therapeutic strategies that prevent the activation and proliferation of autoreactive cells have been suggested, which includes clearance of autoreactive cells ( apoptosis) , receptor editing, induction of anergy and extrinsic cellular suppression. Failure at any of these steps may lead to the production of autoantibodies against platelet and megakaryocyte glycoproteins. An improved understanding of the mechanisms for autoantibody production will provide theoretical basis for optimal diagnosis and treatment of ITP.

Objective To develop a system for hand function evaluation and training based on virtual reality. Methods 5DT Data Glove 5 Ultra, Visual Studio 2010 were integrated as the development environment and DirectX 9.0 as components, and the system was developed based on the MFC programming framework. Results and Conclusion The system can assess the fingers function, recognise gestures and can be used as a 3D environment for virtual training, which may guide the patients to take the training actively.

Objective To investigate the diagnosis value of 128-slice spiral CT in patients with adult intussusception. Methods Direct features of 128-slice spiral CT of 63 adult intussusception patients confirmed by operation and pathology were analyzed retrospectively. Results In 63 cases of intussusceptions, 1 case had idiopathic intussusception, and the other 62 cases had secondary intussusception (1 case with multiple intussusceptions). Direct signs included:target signin 60 cases,double intestines signin 59 cases,blood vessel curling signin 56 cases, andcomet-tail signandkidney signin 51 cases. Lipoma was the most common benign lesions of intussusception, and colon cancer was the most common malignant lesions of intussusception. Conclusions The 128-slice spiral CT combined with multiple plane restructuring has the important value in diagnosing adult intussusception.

Purpose To study the effect and mechanism of miR-199a-5p on the invasion of breast cancer MDA-MB-231 cells. Meth-ods miR-199a-5p mimic was transfected into MDA-MB-231 cells. Influence of miR-199a-5p on the invasion of MDA-MB-231 cell was displayed by Transwell, the expression of epithelial-mesenchymal transition ( EMT) molecular markers ( E-cadherin, vimentin) regulated by miR-199a-5p was determined using immunofluorescence and Western blot. Western blot was employed to assess the levels of ERK5, pERK5, EGF and SP1 in MDA-MB-231 cells dealt with miR-199a-5p mimic and LNA-siRNA. Chromatin immunoprecipita-tion (CHIP) was applied for displaying the reaction of SP1 with ERK5 promoter. Results miR-199a-5p could inhibit the invasion of MDA-MB-231 cells, decrease the expression of vimentin and enhance E-cadherin. Meanwhile, miR-199a-5p decreased the expression of ERK5 and pERK5, the levels of EGF and SP1 were also downregulated. On the contrary, the levels of EGF, SP1, ERK5 and pERK5 were enhanced by employing LNA-siRNA targeting miR-199a-5p. SP1 could bind with ERK5 promoter. Conclusions miR-199a-5p could reduce the expression of ERK5 and pERK5 through regulating EGF and SP1, which functioning the inhibitory effect on invasion of MDA-MB-231 breast cancer cells.

In the present study, platelet GSH_(px), SOD activities and cAMP contents, as well as whole blood, erythrocyte, plasma and hair selenium levels were comparatively measured in children from Keshan disease endemic and non-endemic areas. The results showed that blood and hair selenium contents were significantly lower in children of the endemic area than in those of the non-endemic area; children in the endemic area had a signifi cantly lower platelet GSH_(px) activities as compared to those in the non-endemic area, but no remarkable difference of platelet SOD activities and cAMP contents between children in the two areas was observed. The results indicate that the reduced GSH_(px) activity of low-selenium children in the endemic area may result in alterations in platelet functions and arachidonic acid metabolism.

Objective To construct the bFGF/Math1 f usion gene expression vector and to investigate its expression in the cochlea of rat. Methods Using the recombinant DNA technique to construct the bFGF/Math1 gene expression vector and the restriction enzyme analysis to ide ntify the correct construction. The mRNA expression was detected by the RT-PCR m ethod after being transfected into the cochlea of rat using lipofectin reagent. Results The recombinant was correct and the bFGF/Math1 wa s expressed in the cochlea of rat.Conclusion The PRK5-bFGF-Math1 eukaryotic expression plas mid was successfully constructed and the bFGF/Math1 was expressed in the mammali an cochlea.