Natural killer (NK) cells have long been considered the only representative of lymphocyte lineages among the innate immune system ,but recent studies have revealed that several types of innate lymphoid cells ( ILC ) exist in both humans and mice.These newly identified ILC populations were mainly distributed at mucosal barriers ,regardless of their rarity ,they play important roles in the defense against pathogens and in the maintenance of tissue or organ homeostasis .In the early stages of ILC development ,a common ILC lineage-restricted progenitor exists and under the control of different transcription factors ,the progenitor can later give rise to different ILC subsets with distinct phenotypes and functions.Different ILC subsets exhibit distinct cytokine secretion profiles ,based on the categorization of helper T cell subsets , ILC family has been further classified into three groups.The finding of diverse ILC extremely enriches the content of innate immunity ,and also provides new insights into links between innate and adaptive immunity .

A new NK cell subset with antigen presentation function was recently found and called as interferon-producing killer dendritic cells (IKDC cells).These cells co-express surface markers of NK cells and DCs;functionally,they can secrete interferons,kill target cells and have antigen-presenting ability.IKDCs extensively exist in almost all lymphoid tissue or organs with similar phenotype,but recent studies indicated that IKDCs were developmently not from DC cells but from NK cells,the conclusion of which is still in its early stage.The discovery of IKDC will be help to understand the link between innate and adaptive immunity.

Natural killer ( NK) cells are important innate effector cells and play a vital role in maintaining homeostasis through potent cytotoxic activity and cytokine production. Recent findings show that NK cells can also shape adaptive immune responses by in-fluencing a variety of immune cells. In addition to direct interactions with other immune cells,NK cells can indirectly stimulate or inhibit adaptive immune response via influencing infected cells and pathogen load. Abundant studies have highlighted the positive regulatory functions of NK cells, while their negative regulatory functions have increasingly attracted attention in recent years. Here, we review recent findings on negative regulation of adaptive immune response by NK cells, discussing the involved effector cells and function mechanism,and demonstrate how this negative regulation influences the overall outcome of adaptive immunity in infection and tumor disease.

ObjectiveTo summarize the recent therapeutic effects of mesh-plug tension-free hernioplasty in elderly inguinal hernia. MethodsAll cases were performed with mesh-plug case-hardened products, which are manufactured by American Bard Company. ResultsAll the operative procedures were performed smoothly. Postoperative complications were:6 cases of urinary retention,4 scrotal hydroceles,2 persistent wound pain,2 local lightly projections with foreign body sensation,2 hypoincisional haematoma. 1～24 months of follow-up were taken,2 recent recurrences were reported. ConclusionMesh-plug tension-free hernioplasty is a perfect surgical operation. Its main characteristics are:simple performance, less trauma, tension-free, time-saving, good recent therapeutic effect, and fewer recent recurrence. It is especially suitable to the elderly patients and/or Patients with other diseases.

OBJECTIVE:To observe clinical efficacy and safety of torasemide in the treatment of chronic heart failure(CHF). METHODS:94 patients with CHF were selected and randomly divided into control group and observation group,with 47 cases in each group. Control group were treated with routine treatment,such as bed rest,oxygen inhalation,control of total body fluid in-take,routine anti-heart failure therapy and use of diuretic in 24 h. Based on the above treatment,observation group were treated with Torasemide injection with initial dose of 5-10 mg,qd,gradually increasing to 20 mg/d,maximal does of 40 mg/d. Both group re-ceived 7 days of continuous treatment. Clinical efficacies were observed in 2 groups as well as serum potassium and sodium,Scr,24 h urine volume and the rate ofⅠ-Ⅱgrade cardiac function before and after treatment. The occurrence of ADR was compared between 2 groups. RESULTS:The total effective rate of observation group was 61.70%,which was significantly higher than that of control group (46.81%),with statistical significance (P<0.05). There was no statistical significance in serum potassium and sodium and Scr between 2 groups before and after treatment(P>0.05). There was no statistical significance in 24 h urine volume and the rate ofⅠ-Ⅱgrade cardiac function between 2 groups before and after treatment(P>0.05);after treatment,24 h urine volume and the rate ofⅠ-Ⅱgrade cardiac function of 2 groups were increased significantly,the observation group was higher than the control group, with statistical significance (P<0.05). There was no statistical significance in the incidence of ADR between 2 groups (P>0.05). CONCLUSIONS:Torasemide is effective for CHF,and can promote diuresis and the recovery of cardiac function with good safety.

Objective:To build murine asthma model with Dermatophagoides pteronyssinus. To compare the curative effects of the immunotherapy regimens with either Dermatophagoides pteronyssinus allergen extracts or a recombinant Derp2(rDerp2). To offer a novel thread for immunotherapy of allergic diseases.Methods:The BALB/c mice were divided into four groups randomly. They were: negative control, positive control, allergen extracts and rDerp2. Mice were sensitized by i.p. injection of mixture of allergen extracts and Al(OH)3 except the negative control,and were i.p. given a treatment with either allergen extracts or rDerp2 respectively, and then were i.n. given allergen extracts as a challenge. Negative control was treated by saline always. Assays for IgE,IgG1,IgG2a in serum,IL-4,IFN-? in BALF and SCCS were performed by ELISA. Total cell number and assorted cell number in BALF samples were determined. The lungs kept in 10% formalin were made into slices stained by HE in order to observe the pathologic changes in lungs.Results:Compared to the negative control, in the positive control the total cell number and the number of inflammatory cell in BALF were significantly increased, BALF eosinophil counts were significantly increased, neutrophils and eosinophils were the predominant BALF inflammatory; and the Th2 cytokine, e.g. IL-4, was the main cytokine in BALF and SCCS. Compared with the positive control, the allergic responses in the mice given relevant immunotherapy were obviously alleviated, and the predominant cytokine in BALF and SCCS was Th1 pattern, e.g. IFN-?.Conclusion:We established successfully the murine asthma model. Immunotherapy with Dermatophagoides pteronyssinus allergen extracts had better curative effects than immunotherapy with recombinant Derp2.

Objective To prepare HCC-targeted lipid ultrasound microbubble containing 10-hydroxycamptothecin (10-HCPT), and to assess its targeting function in vitro. Methods After the biotinylated monoclonal antibody Hab18 was prepared, the biotinylated degree was determined. Microbubbles containing 10-HCPT were prepared by mechanical vibration. Then the biotinylated antibody was attached to the surface of the microbubbles by avidin-biotin interaction. The physical property, entrapment efficiency and the drug-loading amounts of 10-HCPT lipid microbubbles were determined. The combination of biotinylated Hab18 with microbubbles containing 10-HCPT was proved by immunofluorescent assay, and the targeting function of the targeted microbubbles containing 10-HCPT was observed with light microscope, served non-targeted microbubbles as control group. Results About 13 biotin molecules were coupled to each antibody in average. The disposition of the prepared microbubbles was steady and the mean diameter was 1.52 μm. The drug entrapment efficiency was 76.32% and the drug-loading amounts was 21.81%. Red fluorescence was observed at the edge of the microbubbles in immunofluorescent assay, and the conjugation of the targeted microbubbles containing 10-HCPT with 7721 cells was tight while control group was negative. Conclusion HCC-targeted lipid ultrasound microbubbles containing 10-HPTC can be prepared successfully, with higher entrapment efficiency and drug-loading amounts and strong targeting function in vitro.

Natural killer ( NK) cells have historically been considered short-lived cytolytic cells that can rapidly respond against microbial pathogens and tumors in an antigen-independent manner.Recently,NK cells have been shown to possess features of a-daptive immunity with immunological memory in a manner similar to that of T and B cells.Three major viewpoints of NK cell memory initially arose from the studies of NK cell memory to recall to mouse cytomegalovirus ( MCMV ) , cytokine and skin-contact hypersensitive chemical antigens.Currently,NK cell memory has been reported in acute infection of mouse HSV ,influenza virus,HCMV and simian immunodeficiency virus ( SIV).Here,we review the latest discoveries and unsolved questions regarding NK cell memory in these models.Studies to reveal the mechanisms for NK cell memory may provide opportunities for the therapeutic use of NK cells in in -fectious diseases and cancer.

Objective To compare the low- and standard-dose protocols in the evaluation of coronary artery calcification (CAC) scores and in image quality,and to assess the accuracy of low-dose prospective ECG-gated helical CT in CAC measurements.Methods Forty-three patients with CAC were scanned twice using a tube current setting of 100 and 55 mA retrospectively.CAC scores (Agatston) of different branches of coronary artery were recorded.The mean and SD of the CT attenuation values in regions of interest in the aorta were measured,and the value (mean + 2 × SD) were obtained.Results Calcification plaques were found in 105 of the 172 vessels in the 43 subjects.The radiation dose of the 50 mAs group was (0.72 ± 0.04) mSy,significantly lower by 0.6 mSv than that of the 100 mAs group [(1.32 ± 0.08) mSv,P ＜ 0.05].The total calcification score of the 55 mAs group was significantly positively correlated with the routine dose group after performing the square root transformation (r =0.998).A signficant correlation existed in vessel-based calcification between these 2 groups (r= 0.997).Conclusions Low-dose prospective ECG-gated 64-slice CT yields high accuracy on CAC scoring while maintaining the image quality needed to measure CAC.

Objective To investigate the value of advanced virtual monoenergetic technique(mono-plus) of dual-energy CT (DECT) in improving imaging quality of the lliofemoral arteries.Methods Forty consecutive patients underwent DECT scan.Mono-plus images (40 keV),optimal monoenergy images and mixed energy images were obtained by using Siemens Syngo.via VB10A workstation.CT values,signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and subjective image quality were calculated in the abdominal aorta,iliac artery,external iliac artery,femoral artery,profound femoral artery, lateral circumflex femoral artery,transversal branch of lateral circumflex femoral artery,medial circumflex femoral artery and profound branch of medial circumflex femoral artery and compared among the three groups.Results Compared with the optimal monoenergy and mixed energy groups,CT value and CNR of the 9 arteries were significantly higher in the mono-plus group (P<0.003).SNR of the transversal branch of lateral circumflex femoral artery and the profound branch of medial circumflex femoral artery showed no significant difference (P>0.05) among the threegroups,whereas SNR of the arties bigger than the 6th grade branch were significantly lower in the mono-plus group (P<0.05).The subjective image quality in the mono-plus group was significant better than the other two groups(P<0.001).Conclusion 40 keV mono-plus technique in DECT can improve the display of lliofemoral arteries especially the small and distal branches.