Objective:To explore the role of CD86 costimulation in inducing Th2 bias at maternal-fetal interface and the relationship to outcomes of gestation.Methods:Pregnant DBA/2J mated CBA/J mice with a high embryo resorption rate from 20% to 30% and BALB/C mated CBA/J mice with low embryo resorption rates were studied,with rat anti-murine CD86 mAb administered intraperitoneally at the dosage of 100 ?g,at the time of implantation(day 4) and on the following days(6,8,10) of gestation.The competitive semiquantity RT-PCR and ELISA was applied to analysis of the transcription and expression of Th type-1/Th type-2 cytokines at the maternal-fetal interface at day 9 or day 14 of gestation respectively.The embryo resorption rate was counted at day 14 of gestation.Results:In the model of normal pregnancy,blockade of CD86 costimulation had no significant effects on the original Th2 bias at the maternal-fetal interface,and the outcomes of gestation had not changed significantly.While in the model of abortion-prone,blockade of CD86 costimulation successfully induced a Th2 bias at maternal-fetal interface.Therefore,the embryo resorbing rates decreased significantly.Conclusion:Blocking the CD86 costimulation at the early stage of the abortion-prone pregnancy could recover the physiological balance of Th1/Th2 at maternal-fetal interface and induce the maternal-fetal immune tolerance.

OBJECTIVE To investigate the resistance and the homology of the Acinetobacter baumannii(ABA) strains isolated from inpatients to offer basis for clinical treatment and preservation.METHODS VITEK2-compact system was used to identify 110 ABA strains,and detect their susceptibility to antibiotics.REP-PCR was carried out to detect their homology.RESULTS The 110 isolated strains were multidrug resistant.Rate of sensitivity to amikacin was 91.3%,Rates of resistance to ceftazadime,ciprofloxacin and imipenem were 100.00%,97.83% and 91.30%,respectively.REP-PCR was confirmed part of them was from the same clone.CONCLUSIONS Most of the isolated strains are multidrug-resistant.The same clone of MDR-ABA probably leads to transmission among patients.

Objectives To evaluate the function of peripheral blood T cell subsets in uremia patients and the influence of hemodialysis on them.Methods Expression of CD3,CD4 and CD8 antigen on peripheral blood T cells from 30 cases of hemodialysis and non-hemodialysis patients was evaluated by flow cytometry.Fifteen volunteers were also examined as normal controls.Results The expression of CD3,CD4,CD8 and CD4 +/CD8 + ratio in non-hemodialysis group(NHD) was significantly lower than that of control group(P

BACKGROUND:Pulsed laser deposition synthesis technology has been used to prepare new nano-hydroxyapatite thin film coating by colagen deposition on artificial mechanical heart valve. OBJECTIVE: To investigate the toxicity of new nano-hydroxyapatite thin film on human umbilical vein endothelial cels. METHODS: Human umbilical vein endothelial cels were cultured with nano-hydroxyapatite film room-temperature leaching solution, nano-hydroxyapatite film high-temperature leaching solution, high-density polyethylene and phenol solution. Within 72 hours, cel growth was observed under the inverted phase contrast microscope. At 7 days after culture, cel proliferation and toxicity grading were detected using Cel Counting Kit-8. RESULTS AND CONCLUSION:At 24 hours after culture, cels grew wel, showed fusiform shape, and had strongrefraction in the nano-hydroxyapatite film room-temperature leaching solution, nano-hydroxyapatite film high-temperature leaching solution, high-density polyethylene groups, and no significant differences in cel morphology and number were detected among above groups. Cels in the phenol solution group were suspended, round, pyknotic and dead. At 48 hours, except phenol solution group, cel number increased significantly, and cel grew densely in other three groups. At 72 hours, cels grew strongly, and the gap became smal obviously. Within 7 days after culture, cel proliferation activity was not significant in the nano-hydroxyapatite film room-temperature leaching solution, nano-hydroxyapatite film high-temperature leaching solution, and high-density polyethylene groups, which was significantly higher than in the phenol solution group (P < 0.05). The toxicity of nano-hydroxyapatite film graded 0 to 1. These results suggested that nano-hydroxyapatite artificial mechanical heart valve has good histocompatibility, but no toxicity.

BACKGROUND:A new type of nano-hydroxyapatite artificial mechanical heart valve has been developed using pulsed laser deposition technology at the Department of Materials, Hefei University and Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China. OBJECTIVE:To investigate the compatibility of nano-hydroxyapatite artificial mechanical heart valve with human umbilical vein endothelial cels. METHODS:Human umbilical vein endothelial cels were in vitroisolated, cultured and passaged to the 2-4 generations, and then the cel suspension was inoculated onto the nano-hydroxyapatite artificial mechanical heart valve. After 3, 7, 12 days of culture, the cel growth on the artificial mechanical heart valve was observed under scanning electron microscope. In addition, the human umbilical vein endothelial cels were respectively cultured in room-temperature and high-temperature extract liquids of nano-hydroxyapatite artificial mechanical heart valve, high-density polyethylene and phenol solution extracts for 72 hours, and then, the proliferation of cels was detected by MTT method. RESULTS AND CONCLUSION:Under the scanning electron microscope, the human umbilical vein endothelial cels were fusiform- or polygon-shaped with protuberances adhered to the artificial mechanical heart value at 3 days of culture; the cels were stretched thoroughly and fused at 7 days of culture; and the cels were confluent to pieces that tightly overlaid the heart valve surface and the extracelular matrix was formed localy at 21 days of culture. Results from MTT test displayed that the nano-hydroxyapatite artificial mechanical heart valve had no cytotoxicity to the human umbilical vein endothelial cels, indicating a good cytocompatibility.

AIM: To investigate the ethanolic and aqueous extracts from Sancao prescription (Spica prunellae, Oldenlandia diffuse (willd) Roxb, Herba agrimoniae) on the proliferation of human lung adenocarcinoma cell line (A549). METHODS: 95% ,60% and 30% ethanolic extract and aqueous extract were prepared from Sancao pre-scription. The MTT assay was used to determine the inhibitory action against the proliferation of A549. RESULTS: IC_(50) of 60% ethanolic extract over A549 was one of the lowest in extracts. Combination of 60% and 90% ethanolic extract showed the synergistic antitumour activity. CONCLUSION: Ethanolic extract of Sancao prescription has and effect on human hung adenocarcinoma(A549).

BACKGROUND: The training task for aircrew of army airmen is very heavy, the evaluation of flight personnel on psychological diathesis is performed to early discover and deal with corresponding questions.OBJECTIVE: To compare the difference of mental health between aircrew and ground crew of army airmen and provide reference data for implementing corresponding norms.DESIGN: Chester sampling investigation and paired design were applied.SETTING: the 71687 Force of Chinese PLA, the 71521 Force of Chinese PLA, Department of Epidemiology, Fourth Military Medical University of Chinese PLAPARTICIPANTS: By chester sampling, 122 aircrew and 122 ground crew of one army airmen in one stationed training troop were randomized in February 2001. The pairs were made at ratio of 1:1 according to age difference less than 3 years and same sex and nationality. The investigated persons were all male, of Han and aged varied from 23 to 52 years.METHODS: Cornell health questionnaire was adopted respectively in investigation of aircrew and ground crew of army airmen. The investigated persons finished and handed in questionnaire independently on the spot in manner of secretion and centralized filling-up. Cornell health questionnaire is composed of 18 sections, including 195 questions, involving 4 aspects,named somatic symptoms, medial and family history, general health and habit and mental symptoms. The total score of Cornell health questionnaire ≥ 30 indicates somatic and mental disturbance and the score of mental section ≥ 10 indicates mental disturbance, both of which are taken as the criteria in comparison of psychological health in receptors of two groups.MAIN OUTCOME MEASURES: Every factor score and total score in somatic and mental sections in Cornell health questionnaire for aircrew and ground crew.RESULTS: The tested results of each 122 cases in either aircrew group or ground crew group entered result analysis. Evaluated results of somatic and mental symptoms in receptors of two groups: the total score was low in Cornell health questionnaire (0-14 scores), of which, the total score in aircrew group was higher than that in ground crew group (81.5% and 59.8%,P ＜ 0.05); the score in mental section was low (0-9 scores), of which, that in aircrew group was higher remarkably than that in ground crew group (99.2% and 91.8%, P ＜ 0.01); the score for the receptors with somatic and mental disturbance (total score≥30, score in mental section ≥ 10) in aircrew group was lower than those in ground crew group (4.1% and 12.3%, P ＜ 0.05); the score for the receptors with mental disturbance (score in mental section≥ 10) in aircrew group was lower remarkably than ground crew group (0.8% and 8.2%, P ＜ 0.01). For somatic section in aircrew group, except the factors of muscle, skeleton and skin, their scores were higher than those in ground crew group (P ＞ 0.05), the scores of the rest factors were all lower than those in ground crew group, of which, the difference was significant in evaluation of factors of eye, ear, nervous system, urinary reproductive system and fatigue in comparison of two groups (P ＜ 0.05). The score of every factor in mental section of aircrew group was lower than those in ground crew group. Except tension factor, in comparison of the rest factors in two groups, the significant difference was present (P ＜ 0.05).CONCLUSION: Overall psychological health state in Cornell questionnaire of aircrew in army airmen was superior to ground crew. Aircrew still presents a part of psychological health questions, mainly in somatic section and inadaptability was the most positive response in mental section, suggesting that aircrew probably presents inadaptable phenomena.

The abdominal visceral fat content in obese SD rats induced by high fat diet for 10 weeks was significantly higher than that in control group [(26±6 vs 13±3)g,P<0.01] ,along with increased CRP mRNA expression in abdominal visceral fat (0.901±0.085 vs O. 402±0.036, P<0.01). As compared with normal control group, in the high fat group the concentrations of CRP in portal vein [(743.8±95.8 vs 558.3 ±118.3) mg/L, P<0.01] and peripheral vein[(596.3±38.9 vs 485.8±30.2) mg/L,P<0. 05] were higher. The concentration of CRP in portal vein was significantly higher than that in peripheral vein in high fat diet group(P<0.01) ,but this was not evident in control group. These results suggest that the increased CRP expression in visceral adipose tissue may partially account for the elevation of serum CRP in obesity.

Objective To investigate the C1q expression in the patients with pulmonary tuberculosis (TB) and its mechanism on the anti-TB role of macrophages .Methods Each 30 cases of active pulmonary TB ,tuberculous pleurisy ,latent Mycobacterium tu-berculosis infection and healthy controls were selected .Peripheral venous blood 10-20 mL was collected on the next day of admis-sion or on the time for physical examination .Pleural fluid 50 mL was extracted in the patients with hydrothorax and the lung tissue specimens 1 cm × 1 cm × 1 cm was taken in the operative patients .The real-time quantitative PCR(RT-PCR) was adopted to detect the express C1q in peripheral macrophages and the C1q expressing in macrophages of the lung tissue was detected by immunohisto-chemical staining .Results The peripheral blood C1qA expression level in the active pulmonary TB group and the tuberculous pleu-risy group was significantly higher than that in the healthy control group and the latent TB infection group (P<0 .05) .The C1qA expression level in hydrothorax in the tuberculous pleurisy group was higher than that in the active pulmonary TB group (P<0 .05) ,and the C1q expression in hydrothorax in these two groups was higher than that in peripheral blood (P<0 .05) .C1q was strongly expressed in macrophage cytoplasma in the active pulmonary TB group and the TB pleurisy group ,but weakly expressed in the multinuclear macrophages .Conclusion The peripheral blood C1qA expression level in the active pulmonary TB group and the tuberculous pleurisy group was significantly higher than that in the healthy control group and the latent TB infection group (P<0 .05) .The C1qA expression level in hydrothorax in the tuberculous pleurisy group was higher than that in the active pulmonary TB group (P<0 .05) ,and the C1q expression in hydrothorax in these two groups was higher than that in peripheral blood (P<0 .05) . C1q was strongly expressed in macrophage cytoplasma in the active pulmonary TB group and the TB pleurisy group ,but weakly ex-pressed in the multinuclear macrophages .

Objective: To determine the role of interleukin-10 (IL-10) secreted by peripheral blood mononuclear cells (PBMC) in the maintenance of hemodialysis in patients with immune deficiency and to evaluate thot if IL-10 can bea biocompatibility index of dialyzer. Methods: Twenty patients with end-stage renal disease were divided into maintenance hemodialysis group (MHD group) and non-hemodialysis group (NHD group). Patients in MHD group were dialyzed with cellulose (CA group) and polysulfone (PS group) dialyzers respectively. Ten healthy persons were as controls (CON group). The levels of IL-10 in supernatants of PBMC cultured with or without lipopolysaccharide (LPS) were measured by using ELISA method in all groups. Results: There was no spontanous IL-10 secretion in all groups. The level of IL-10 in all supernatants secreted by PBMC cultured with LPS increased significantly, and the increased levels of IL-10 in MHD and NHD patients were lower than that in controls. The PBMC stimulated by LPS secreted more IL-10 in patients dialyzed by PS with better biocompatibility than those of CA dialyzers with poor biocompatibility. Conclusion: Patients immune deficiency could be improved by using better biocompatible dialyzers more than poor ones, particularly in humoral immunity induced by urimia. The IL-10 could be a parameter in evaluating the biocompatibility of dialyzer.