o statistical difference between WMD group and control group (t = 1.83, t = 0. 88, P 0. 05). Conclusion Conventional MRI is able to quantify the brain maturation and prognosis of premature infants using TMS.

DNA methylation is an important epigenetic modification mode , which plays a crucial role in gene expression , genome stability and development .DNA methylation is catalyzed and maintained in cell proliferation by the family of DNA methyltransferases.The ten-eleven translocation (TET) enzymes oxidize 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC).Here, we briefly describe the TET enzymes and their role in cancer , and the distribution , the role and detection method of those three oxidation products of cytosine in genome .

Objective To investigate the effect of milk basic protein (MBP) on bone metabolism in normal and ovariectomized (Ovx) rats. Method Forty-eight female Sprague-Dawley rats were ovariectomized and another 12 rats received sham operation (Sham). After 10 d recovery period, the Ovx rats were randomly divided into 4 groups: control, low-dose, medium-dose, and high-dose MBP group. Another 44 normal female rats without ovariectomy were also divided into 4 groups as above. The MBP dosages for each group were respectively 0, 10, 20, 30 mg/kg bw. All rats were i.g. administered for 90 d. Bone mineral density (BMD) of the femur (at proximal end, middle of diaphysis, and distal end) was measured by dual-energy X-ray absorptiometry in vivo. The amounts of calcium, magnesium and phosphorus were analyzed by ICP-AES. Results BMD at distal end of femur was significantly higher in normal low-dose group than in normal control group while no significant effect was observed in Ovx MBP groups. As for the amounts of calcium, magnesium and phosphorus, there were no significant differences among normal experimental groups and also among Ovx experimental groups. However, some variations in the level of those minerals were observed. Conclusion MBP at 10 mg/kg bw significantly elevated BMD at femoral distal end in normal rats, while no similar effect was observed in Ovx rats. Besides its influence on bone minerals, there may be another mechanism involved in its effect on bone metabolism.

Objective To investigate the relationship of angiotensin Ⅱ typel receptor gene A1166C polymorphism and chronic heart failure.Method Polymerase chain reaction and restriction fragment length polymorphism(PCR-RFLP)was used to detect the A1166C polymorphism of AT1R gene of 135 chronic heart failure patients and 121 controls.Results The genotype frequency of the patients and controls of AA,AC,CC were 87.6%.12.4%,0%and 87.6%,11.6%,0.8%respectively.Allele frequency of the patients and controls were 93.8%,6.2%and 93.6%,6.4%respectively.There was no significant difference of the frequency of AT1R genotype and allele between CHF and controls(P＞0.05).Conclusion Angiotensin Ⅱ type 1 receptor gene A1166C polymorphism is not associated with CHF.

BACKGROUND: Recently,the technique of isolation procedure of viable islets cell from large animals has been mature and used in clinical islet cell transplantation. Some study results indicate that low yields of pig islet cell isolations is probably not due to the presence of higher or more aggressive enzyme activities during the porcine isolation procedure. Therefore, the causative factors resulting in the inconsistent results should be sought for the intrinsic properties of the pancreatic islet and pancreas. The purpose of the study is to get more pancreatic islet cells for diabetic patients.OBJECTIVE: To investigate the effect of single enzymatic solution (SES)and multi-enzymatic solution(MES) on adult porcine pancreatic islet cell isolation,and to provide the theory base for diabetic patients rehabilitation.DESIGN: A completely randomized and controlled experiment based on animals.SETTING: General surgery and gerontology department in a university hospital.MATERIALS: The experiment was conducted in the Second Affiliated Hospital of Harbin Medical University from June 2003 to May 2004. Twenty consecutive random-bred adult pigs, 12 - 24 months old, weighing average 100 kg,were selected for experiment from Hada Slaughterhouse of Harbin.INTERVENTIONS: After slaughtering,the spleentic lobe of the pancreas was excised using sterile surgical gloves and surgical instruments. Each was immediately transported in 500 mL of sterile RPMI1640 solution at 4 ℃ to the laboratory for processing. After removal of fat peritoneum and superficial blood vessel,each pancreas was first immersed in 1:5 000 Liquor chlorhexidine for 3 minutes,then washed three times with cold RPMI1640, next mechanically minced into 1 mm×1 mm×1 mm fragments,weighed,and equally divided into two groups. Adult porcine islets were isolated with two different collagenase solutions(SES and MES).MAIN OUTCOME MEASURES: Islet count was performed with DTZ-staining. The viability was assessed by trypan-blue staining. Porcine islet insulin-secretory function was assessed by insulin content of cultured porcine islets and by insulin release. Islet morphological integrity was finally established by electron microscope examination.RESULTS: Overall islet cell content were statistically different between the two methods[(1 782 ±427) IE/g vs (1 293 ±451) IE/g,P<0.05]. No significant difference was found in viability,function or morphology of islet between MES and SES(P>0. 05).CONCLUSION: An average of isletisolated with MES method represents a uniquely massive yield in comparison with that by SES method. A good viability was also confirmed by static incubation and culture. The transplantation of those pancreatic islet cells can help to control the syndromes of diabetes.

Objective: To research effect of different doses of Changle on the structure and function of rat liver.Methods: 180 healthy Wistar rats were divided into 5 experimental groups according following doses: 0.1,0.2,2.0,10.0 and 20.0 mg*kg-1,respectively, and the control group given physiological saline for six months. The changes of liver structure were examined by means of normal histological chemistry and transmission electron microscope(TEM). Results: The body weight of animal was linearly increased with the decrease of administered doses, gradual reduction of glycogen in hepatocytes and infiltration of inflammatory cells in the portal area were found in the group of 20.0 mg*kg-1. Changes of ultrastructure showed there were dense bodies and lysosomes containing dense granules in Kupffer cell and hepatocyte,and they were increased along with doses adding. Nuclei deformed, ALP and GPT in serum were rose in the group of 20.0 mg*kg-1. Different doses of Changle could lead to distinct biological effects. Conclusion: Long-termed administration of 20.0 mg*kg-1 Changle can lead to damage of structure and function of rat liver.

Objective:To investigate regulatory immune response induced by DNA vaccination encoding T cell receptor V?5.2 or V?2.1 chain predominantly displayed on ovalbumin (OVA)-specific T cell clone.Methods:BALB/C mice were vaccinated with pcDNA3.1 encoding T cell receptor (TCR) V?5.2 or V?2.1 chain respectively.Using RT-PCR,transcription of the recombined plasmids was analysed. Cell proliferation was measured by 3H-TdR incorporation.CTL response was assayed by JAM test.Immuno-fluorescent assay was used to examine the anti-TCR antibody level and the number V?2 +T cells.Results:RT-PCR analysis showed that the recombined plasmids can be transcripted in vivo and in vitro.DNA vaccine with TCR variable chain effectively induced TCR-specific humoral and cellular immune response,V?2 +T cells was not depleted by V?2.1 TCR-DNA vaccination,but rather was anergy.Conclusion:Regulatory immune response can be induced by DNA vaccination encoding TCR V? or V? region in normal mice.

Objective To investigate the importance of hepatitis B virus ( HBV ) infection in the patho-genesis of cholangiocarcinoma ( CC) and further clarify the correlation between the occurrence of intrahepatic and extrahepatic cholangiocarcinoma .Methods HBV protein and gene of 52 formalin fixed,paraffin embedded tis-sues with CC were detected by immunohistochemistry and nest PCR .Results Hepatitis B virus X gene was de-tectable in 33.3%(7/21)of 21 intrahepatic cholangiocarcinoma cases .Hepatitis B surface antigen(HBsAg)was detectable in 21.7%(5/21)and hepatitis B core antigen(HBcAg)was detectable in 19.0%(4/21)of 21 intrahe-patic cholangiocarcinoma cases .In contrast,no HBsAg,HBcAg and hepatitis B virus X gene were detected in any of the 31 extrahepatic cholangiocarcinoma cases .Conclusion HBV infection is a significant risk factor for intra-hepatic cholangiocarcinoma ,but not for extrahepatic cholangiocarcinoma ,in Northeast of China .The integration of HBV gene may be involved in the carcinogenesis of intrahepatic bile duct epithelial cells .

Objective To study the subcutaneous injection of physostigmine (PHY) inducing hypothermic response and its relationship with endogenous arginine vasopressin ( AVP). Methods Core temperature and motor activity were monitored by telemetry in female rats maintained at an ambient temperature of 25℃. Tail skin temperature was measured at 30 min intervals with digital thermometer. The central cholinergic antagonist, scopolamine ( lmg/kg ) and AVP V_1 receptor antagonist were administered during the period of PHY (0. 25mg/kg) induced hypothermia. Plasma AVP concentration was measured at 50 min after administration of PHY. Results Subcutaneous injection of PHY led to a rapid reduction in core temperature concomitant with a marked elevation in the heat loss from the tail. The hypothermic response of PHY was blocked by scopolamine and AVP V1 antagonist. Plasma AVP concentration increased markedly at 50 min after PHY. Conclusion The results suggest that endogenous A VP could be involved in PHY -induced hypothermic processes. This may be a novel mechanisms of action for a reversible anticholinesterase drug ( such as PHY ) - induced hypothermia.

The interventional treatment of lung cancer is tightly related with hemodynamic situation of artery.To study hemodynamics of the interventional treatment of lung cancer can significantly improve curative effect and decrease complications.Through simulation experiment,the ratio of drug injection around the entrance of bronchial artery is obtained and the definition of natural perfusion region is given.The evidence for interventional treatment of lung cancer and the principle avoiding high-level paraplegia in clinical interventional treatment of lung cancer are also presented.