[Objective]To explore the correlation between anticardiolipin antibodies and post-SARS patients with osteonecrosis,investigate the etiology of post-SARS osteonecrosis,and select the sensitive molecular symbols for early diagnosis and distinguish the high risk population.[Method]The studied subjects were divided into two groups.Sixty-two post-SARS patients with osteonecrosis was one group,and 52 matched healthy people was as normal controlled group.Empty stomach blood samples from cubital veins were collected from both groups.IgA,IgG and IgM of anticardiolipin antibodies types were examined by ELISA.[Result]Twenty-one of 62 post-SARS osteonecrosis patients were tested at least one type of anticardiolipin antibodies positive,among them,with IgA(11.33?11.209)APL,IgG(5.127?5.927)GPL,IGM(17.821?10.606)MPL.Four of 52 control group persons were detected positive,with IGA(10.702?3.126)APL,IgG(5.184?4.780)GPL,IgM(14.684?5.516)MPL.There were significant differences between two groups,while,there were no difference in prothrombin time(PT),thrombin time(TT),prothrombin activity(PTA)and international normalized ratio(INR).[Conclusion]The study indicates an increased positive incidence of anticardiolipin antibodies in post-SARS patients with osteonecrosis.This has reflected that anticardiolipin antibodies may play a role in osteonecrosis.

To study the role of a novel MDR-related gene MGr1-Ag in the multidrug resistant (MDR) gastric cancer. The whole length MGr1-Ag gene was cloned, and eukaryotic vectors carrying the full length of MGr1-Ag cDNA and its antisense expression vector were constructed. The sense vector and anti-sense were then transfected into MGC803 cells and SGC7901/VCR cells respectively by lipofectamine. The result showed that a 1.0kb fragment was successfully amplified by RT-PCR and cloned into pUCm-T vector. DNA sequencing suggested that the fragment was the properly encoded MGr1-Ag gene. Recombinant eukaryotic plasmids harboring MGr1-Ag and its antisense expression vector were also obtained by subcloning the gene into pCDNA3.1/V5-His, which was confirmed by endonuclease digestion. As confirmed by Western blot, stable cell strains with up and down-regulated MGr1-Ag expression were constructed. Those cell strains provided the basis for further study on the MGr1-Ag in MDR of gastric cancer.

Objective To investigate the significance of administration of ionic contrast media with dexamethasone in preventing side effect during enhanced CT scanning. Methods We prospectively studied 520 patients who had enhanced CT scans and divided them into two groups: 259 patients received ionic contrast medium with dexamethasone (dexamethasone group); 261 patients received ionic contrast medium without dexamethasone (contrpl group). The side effects of the patients in two groups with different ages were compared. Results There were 19 patients with side effects in dexamethasone group (7 3%), 20 patients with side effect in control group(7 7%). The side effect rate in those patients over the aged 20 years and under the aged 60 years was higher than other age groups. The side effect rate was similar between dexamethasone group and control grouop.Conclusion Administration of Ionic contrast media with dexamethasone during CT scanning can not obviously decrease the incidence of side effect.

Objective To study the relationship among p53 gene mutation, apoptosis and cellploidy as well as to explore the role of mutated p53 gene in tumorigenesis. MethodsA total of 85 speci-mens (20 normal ovarian specimens, 20 ovarian benign tumors, 20 non - metastatic carcinomas and 25metastatic carcinomas) were chosen． p53 gene mutations were detected by PCR- SSCP (single strand con-formation polymorphism). Cell ploidy, apoptosis role of carcinoma cells and cell distribution in each cellstage were detected by flow cytometry. Resultsp53 gene mutation and non- mutation of ovarian carci-noma was 60% and 40% respectively ( P >0.05). The rate of apoptosis of carcinoma cells with mutationof p53 gene (20.25%) was much lower than that without p53 mutation (41.68%, P <0.05). Aneuploidcarcinoma cells had been found in 17/23 carcinoma specimens with p53 gene mutation and 8/22 carcinomaspecimens without p53 mutation ( P < 0.05). Aneuploid carcinoma cells metastasize more easily thandiploid carcinoma cells ( P < 0.05). The rate of apoptosis was not different between aneuploid and diploidpatients. ConclusionMutation of p53 gene decreases the apoptosis rate of ovarian carcinoma and maypromote tumorigenesis. Cell ploidy had a linkage with p53 gene mutation, but not with cell apoptosis.

Objective To evaluate the endoscopic tendon sheath release for stenosing tenovaginitis (trigger finger). Methods Five patients with stenosing tenovaginitis (2 in thumbs, 1 in middle finger, and 2 in ring fingers) underwent operations by Smith & Nephew Endoscopic Trigger Finger Release system. After two 3.0mm transverse incisions were made, the window cannula assembly was inserted subcutaneously along the sheath from the proximal portal and advanced until it passed through the distal portal. Then a 2.7 mm endoscope was passed into from the proximal portal and a retrograde knife was introduced into the operative site from the distal portal. Finally the entire length of sheath was sectioned under direct endoscopic vision. Results All operations were successfully completed. Finger's flexion and extension function recovered immediately after the operations. All the patients restarted their employment one week postoperatively. There were no complications such as distinct pain or delayed wound healing in these patients. Conclusions This method has the advantages of minimal invasion, safety, effectiveness and quick recovery, especially suited to diabetic patients or multiple trigger fingers.

Objective To establish stable insect cell line expressing mIL4 on the basis of construction of inset expression vector pIZT/V5-His.Methods Amplified mIL-4 and pIZT/V5-His were treated with EcoRI and XbaI,and mIL-4 were ligated into pIZT/V5-His vector using T4 DNA ligase.Sf9 cells were transfected with recombinant DNA and ELISA was employed to detect soluble mIL-4 production by transfected Sf9 cells.Results Transfected Sf9 cells could significantly produce mIL4(1 mg?L~(-1)) compared!with control group(0.003 mg?L~(-1)).Conclusion Inset expression vector pIZT/V5-His is an ideal expression vector for mIL-4 production in transfected cells.

Objective To explore the influence of different domains of STAT6 expressed by the vector pGEX-6p-2 on signal transduction.Methods Different domains of STAT6 were amplified by PCR technique and ligated respectively into the prokaryotic expression vector.Recombinant DNA was transformed into HB101 cells.Transformants were lysed by supersonic method and lysates run on SDS-PAGE.Results Western blotting analysis showed a high level expression(60 000,56 000 and 50 000) of different domains of STAT6 SHST,DST and NST,and the empty vector only had GST expression.Conclusion Expression vector pGEX-6p-2 can be used for high level expression of different domains of STAT6.

OBJECTIVE To study the epidemiology of drug-resistant and antiseptic-resistant genes of(productive)(enzyme) in meticillin-resistant coagulase negative Staphylococcus(MRCNS).METHODS mecA Gene of the(drug-)resistant ?-lactam,aac(6′)/aph(2″) and aph(3′)-Ⅲ genes of aminoglycoside-modifying enzyme(AME) and(ermA/B/C) genes of erythromycin methyltransferase were detected by polymerase chain reaction(PCR) in 40 MRCNS strains.RESULTS From them there were 39 strains with mecA gene,32 strains with aac(6′)/aph(2″) gene,15 strains with aph(3′) -Ⅲ gene,30 strains with ermA/B/C gene,2 strains with tetM and 6 strains with qacA/B gene.There were 26 strains(65.0%) simultaneously with mecA,aac(6′)/aph(2″)and(or) aph(3′)-Ⅲ and ermA/B/C genes in MRCNS.CONCLUSIONS The drug-resistant rate is higher in MRCNS.There are more than half tested strains simultaneously with 3 to 4 drug-resistant genes.

Objective To investigate the necessity of releasing the distal holdfast fibers of the flexor retinaculum(DHFFR) during endoscopic carpal tunnel release(ECTR).Methods The Experiment Group included 16 cases.The operation was conducted under brachial plexus anesthesia without the use of tourniquet.A 1 cm skin incision was made.The USE system(Universal Subcutaneous Endoscope System) was employed.Both flexor retinaculum(FR) and distal holdfast fibers of the flexor retinaculum were cut off.Postoperative outcomes were compared with another 16 cases of flexor retinaculum release only(Control Group).Results Follow-up evaluation was carried out at 6 postoperative months.According to the Kelly's criteria,there were 13 cases of excellent results and 3 cases of good results in the Experiment Group,and 8 cases of excellent,5 cases of good,and 3 cases of fair results in the Control Group.Significant difference was obser red in flameda Ⅱ or Ⅲ grade patients between the two groups in carative effects(?~2=6.278,P=0.043).No serious complications or postoperative recurrence occurred.Conclusions Flexor retinaculum is not the only structure existing in the carpal canal to be released.More attention should be paid to complete decompression of both flexor retinaculum and distal holdfast fibers of the flexor retinaculum,especially in those who have serious symptoms.

BACKGROUND:Potassium channel is the main ion channel to regulate vascular smooth muscle contraction and relaxation, and closely related with vascular tone. However, the reports about the mechanism of potassium channels in the body’s aging process are rare. OBJECTIVE:To investigate the effects of aging on the arterial ultrastructure and smooth muscle potassium channel reaction, and then to explore the possible mechanisms. METHODS:Sixteen healthy male Wistar rats were col ected, 19-month-old rats were assigned to the old group (n=8), 2-month-old rats were used as young group (n=8). The thoracic arteries were isolated and cut into rings to conduct contractility measurement in six rats of each group. The thoracic arteries were stimulated with specific calcium-activated potassium channel blocker tetraethylammonium, specific voltage-dependent potassium channel blocker 4-aminopyridine, specific ATP-sensitive potassium channel blocker glibenclamide, and specific inward rectifier potassium channel blocker BaCl 2 ultrastructure changes under electron microscope. , and then the arterial contractile response to the blockers were observed. The thoracic arteries of the remaining two rats in each group were taken to observe the arterial RESULTS AND CONCLUSION:Compared with the young group, the ultrastructures of the thoracic aortic endothelial cells and smooth muscle cells were changed in the old group;KCI induced the maximum thoracic aortic contractile tension, and then recovered to the baseline tension, and the recovery time in the old group was significantly longer than that in the young group;al the four kinds of blockers could increase vascular tone, and the tetraethylammonium and 4-aminopyridine induced thoracic aortic contractile response in the old group was significantly lower than that in the young group;there was no significant difference in vasoconstriction induced by glibenclamide and BaCl 2 . Aging can induce arterial ultrastructure changes and declination of vasodilatation capacity, which may partly due to the decreasing of the potassium channels function in smooth muscle cells, especial y the calcium-activated potassium channel and inward rectifier potassium channel.