Objective To study isolation and identification and culture of rat type A spermatogonial cells in vitro.Methods Percoll discontinue density gradient centrifugation combined with different speeds of different cells adhering to dish was used to purify the type A spermatogonial cells.The c-kit and TERT special antibodies were used to identify the type A spermatogonial cells.The purified cells were cultured in vitro. Results 0.614?10~6 cells per testis finally were obtained and the percentage of viable cells was 92.1% by trypan blue dye exclusion test.The percentage of type A spermatogonial cells expressing c-kit and TERT were 91.7?1.2% and 90.8?1.0% respectively.Type A spermatogonial cells could proliferate and self-renew in the DMEM containing 10% NBS.Conclusion Percoll discontinue density gradient centrifugation combined with different speeds of different cells adhering to dish is an efficiency method for isolation of rat type A spermatogonial cells.The purified cells are type A spermatogonial cells by identification of the immunohistochemistry of c-kit and TERT antibodies.Type A spermatogonial cells can proliferate and self-renew in vitro.

Objective To sum up the imaging features of tuberous sclerosis.Methods CT and MRI findings of brain in 20 patients with tuberous sclerosis proved by clinic,imaging or pathology were retrospectively studied. Results Among 20 cases,on CT,the lesions appeared as subependymal calcified noduli in 16 cases (multiple noduli in 14 cases and single nodule in 2) and subependymal uncalcified noduli in 2,the noduli were 2~12 mm in diameter,2 cases were normal.On MRI,the subependymal noduli were multiple in 19 cases and single in one case,the noduli were iso-or hypointensity on T1WI and iso-,hypo or hyperintensity on T2WI.In addition,the lesions within cortical or sub-cortical matter were demonstrated by MRI in 19 cases,and the abnormal signals were showed in local patterns of cortical tubers.The abnormal findings of white matter were radial linear or wedge-shaped or irregular type in 7 cases.The subependymal noduli were enhanced,and the most of cortical lesions were not enhanced after contrast-enhanced MR scans in 9 cases.Conclusion There are characteristic findings of tuberous sclerosis both on CT and MRI.

Anything in the universe can be explained by Yin-yang theory of Chinese medicine. Synaptic connections in the central nervous system also embody a balance between Yin and Yang. To discover the synaptic processes of gathering,storing and retrieving information in the brain is a hotspot field of modem neuroscience. This paper attempts to analyze the synaptic connection in both structure and function from Yin-Yang theory. The connections of axons and dendrites between neurons arc malleable and constantly changing, showing a Yin-Yang balance anatomically. Remodeling, stabilization and plasticity changes of synaptic processes also embody the relationship of contradictions, conflicts and transformation of Yin-Yang functionally. Therefore, it is possible to achieve an unexpected result to solve some modem medical problems by using the thoughts and methods of Chinese medicine.

Objective To observe the changes of behavior, intracellular free calcium and the expression of calmodulin dependent protein kinase Ⅱ(CaMKⅡ) in the hippocampal neurons of chronic forced swimming stress rats. Methods Male Wistar rats were randomly divided into control group and chronic forced swimming stress group. The behavior was examined using sucrose preference test, open-filed test and Morris water maze. The intracellular free calcium was examined by fluorescence spectrophotometer. The expression of CaMKⅡ was detected using colloidal gold immunoelectron microscopy technique, Western blotting and RT-PCR. Results The consumption of sucrose and erect quantity of chronic forced swimming stress group were lower than those of control group(P<0.01, P<0.05). The escape latency time in Morries water maze test of chronic forced swimming stress group was higher than that of control group(P<0.01). The intracellular free calcium level and the expression of CaMKⅡ in the hippocampus was higher than that of control group(P<0.01).Conclusion The lasting dysfunction of Ca~(2+)/CaMKⅡ signaling cascades in hippocampus may play important roles in the pathogenesis of chronic forced swimming stress rats.

Analysis main reasonsof needle stabbing are poor self-protection awareness,unsound health care management system and dangerous behavior and habits.Therefore,medical staffshould strengthen safety education,arouse consciousness of self protection,improve working environment and do proper treatment after needle stabbing to avoid needle injury and safeguard their own health.

Objective To study the manifestations and diagnostic value of MRI for cavernous hemangioma in maxillofacial region.Methods Thirty-one cases of cavernous hemangioma in maxillofacial region proved pathologically were retrospectively analyzed.Results The lesions localized in parotideomasseteric region in 13 cases,in buccal and zygomalicotemporal region in 12 cases,in orbital area in 3 cases and labium in 3 cases.The lesions appeared as ellipse or round-like in 3 cases,fusiform in 2 cases,mass or flat irregular shape in 26 cases.On MRI,20 cases showed long T1 signal intensity,4 cases were slight long T1 and 7 cases were equal T1;on T2WI,27 cases showed high signal intensity and 4 were slight signal intensity.Conclusion The diagnosis of cavernous hemangioma in maxillofacial region can be verified and the shape,the extent of lesion can also be showed by MRI.It provides a reliable basis for clinical diagnosis and operative plan.

To investigate the effect of cigarette smoke extract (CSE) on the role of protein kinase C (PKC) in the proliferation of passively sensitized human airway smooth muscle cells (HASMCs). After synchronization of cultured HASMCs, they were divided into a group A and Group B. The group A was treated with normal human serum and served as controls and the group B was treated with the serum of asthma patients. The group A was further divided into group of A1, A2 and A3 and the group B was sub-divided into the group of B1, B2, B3, B4 and B5. No other agents were added to the group A1 and B1. The cells of group A2 and B2 were stimulated with 5% CSE for 24 h. HASMCs from group A3 and B3 were treated with PKC agonist PMA (10 nmol/L) and CSE (5%) for 24 h. PKC inhibitor Ro-31-8220 (5 micromol/L) was added to the HASMCs of group B4 for 24 h. The cells from group B5 were stimulated with Ro-31-8220 (5 micromol/L) and CSE (5 %) for 24 h. The proliferation of HASMCs isolated from group A and B was examined by cell cycle analysis, MTT colorimetric assay and 3H-TdR incorporation test. The expression of PKC-a in each group was observed by Western blotting and RT-PCR, respectively. The results showed that the percentage of S phase, absorbance (A) value, the rate of 3H-TdR incorporation, the ratios of A value of PKC-alpha mRNA and the A value of PKC-alpha protein in HASMCs from group B1, B2 and B3 were significantly increased compared to those of group A1, A2 and A3 correspondingly and respectively (P< 0.01). The proliferation of HASMCs of group A2 and B2 stimulated with CSE and group A3 and B3 stimulated with CSE and PMA were also significantly enhanced when group A1, A2 and A3 and group B1, B2 and B3 compared to each other (P<0.05, P<0.01, respectively). The percentage of S phase, absorbency (A) value, 3H-TdR incorporation rate, the ratios of A value of PKC-alpha mRNA and the A value of PKC-alpha protein in HASMCs from group B4 treated with Ro-31-8220 and group B5 treated with CSE and Ro-31-8220 were significantly decreased as compared to those of group B1 and B2 correspondingly and respectively (P<0.05, P<0.01). It was concluded that CSE can enhance the passively sensitized HASMC proliferation and the expression of PKC alpha. PKC and its alpha subtype may contribute to this process. Our results suggest cigarette may play an important role in ASMCs proliferation of asthma through PKC signal pathway.
Asthma/*blood ; Bronchi/cytology ; Bronchi/metabolism ; Cell Cycle/drug effects ; Cell Proliferation ; Cells, Cultured ; Culture Media ; Myocytes, Smooth Muscle/*cytology ; Myocytes, Smooth Muscle/enzymology ; Protein Kinase C/biosynthesis ; Protein Kinase C/*physiology ; Serum ; Signal Transduction ; Tobacco/adverse effects ; Tobacco Smoke Pollution/*adverse effects

ObjectiveTo evaluate the role of perfusion weighted magnetic resonance imaging ( PWMRI ) in distinguishing brain glioma recurrence for postoperative radiotherapy patients.Methods Thirty-five patients with suggested recurrent brain glioma (20 true,15 false) were examined by conventional MRI and PWMRI.Regions of interests (ROI) were manually drawn in contrast-enhancing lesion,surround edema region and normal white matter of contra-lateral brain on regional cerebral blood volume (rCBV) images.rCBV values of ROI and rCBVmax were measured,the standardized rCBV ratios were calculated,The mean rCBVmax ratio were compared between two lesion types with group t-test.The rCBVmax ratios of contrastenhancing regions was analyzed by the receiver operating characteristic curve.ResultsThe mean rCBVmax ratio of contrast-enhancing lesion in tumor recurrence was higher than those in non tumor recurrence (4.36vs 1.28,t =3.00,P =0.005 ).The mean rCBVmax of edema regions in tumor recurrence was also higher than those in non tumor recurrence ( 1.79 vs 0.85,t =2.41,P =0.026).Four patients with recurrent tumor and three with non tumor recurrence were wrong diagnosed when set the recurrent tumor rCBVmax ratio ＞2.15.The diagnostic sensitivity,specificity and accuracy for recurrent tumor by PWMRI were 80％respectively.Conclusion PWMRI examination is a useful method for distinguishing brain glioma recurrence.

OBJECTIVE To evaluate the relationship between the amount of interleukin-8(IL-8) and granulocyte colony-stimulating factor(G-CSF) and Helicobacter pylori(Hp) infection in gastric mucosa.METHODS Enzyme linked immunosorbent assay(ELISA) was used to detect the amount of IL-8 and G-CSF in 56 patients including normal gastric mucosa(n=18) and H.pylori infection patients(n=38) who were performed with gastroscope with their supernate fluid of gastrostoma mucosa tissue culture,and to examine the difference between Hp infected cases and non-Hp infected ones and H.pylori infection patients before and after treatment.RESULTS The amount of IL-8 and GCSF in Hp infected cases was significantly higher than non-infected ones(P

Objective To sum up MRI and MR venography features of the dural sinus thrombosis (DST).Methods The findings of MRI and MR venography in 20 patients with DST were retrospectively analysed.Results MRI showed the normal flowing void of the dural sinus disappeared,instead of the abnormal high signal intensities.The easily involved positions respectively were transversal - sigmoid, superior sagittal and straight sinuses. Some cortical drainage and large internal cerebral veins were also involved . MR venography demonstrated that there were no blood flowing in these involved dural sinuses or veins . The locations of these lesions in MRI were same as that in MRV.Conclusion Because the DST can be directly displayed in MRI and MR venography,they are the most reliable methods of non- invasive diagnosis of DST.