Objective To analyze the percentage and functional changes of natural killer T (NKT) cells in peripheral blood and bone marrow of severe aplastic anemia (SAA) children before immunosuppressive therapy (IST) comparing to that of healthy children.Methods Ten children with severe aplastic anemia were included in the study and ten healthy children at the same age were selected as the control group. By lfow cytometry, the percentage of CD3+CD1d tetramer+ NKT cell in peripheral blood and bone marrow were detected from March 2014 to December 2014 in our hospital. Immune magnetic bead separation was used to isolate and purify iNKT cells .The puriifed iNKT cells were cultured in the OCH(50 ng/ml,100 ng/ml or 200 ng/ml)+rhIL-2+rhG-CSF culture systems. The ampliifcation of iNKT cells after cultured in different systems were calculated. Elispot method was used to analyze the spotting form cells (SFCs) of IFN-γ or IL-4 expressed by activated iNKT cells.Results The percentage of CD3+CD1d tetramer+ NKT cells in peripheral blood of SAA group(0.72±0.03)% was signiifcantly lower than that of the control group(0.92±0.02)%(P=0.000). The percentage of CD3+CD1d tetramer+ NKT cells in bone marrow of SAA group(0.82±0.02)% was signiifcantly lower than that of the control group(1.05±0.05)%(P=0.000).In vitro iNKT cell ampliif-cation ability of bone marrow in SAA group was signiifcantly lower than the control group, and in medium concentration(50±6) and high concentration OCH group(52±6), the ampliifcation ability was higher than that in low concentration OCH group(30±5) (P<0.05). The secretion of IFN-γ in the iNKT cells of SAA bone marrow was signiifcantly lower in medium concentration(33±3) and high concentration(35±3)OCH group than that of the low concentration(50±3)OCH group(P<0.01). The secretion of IL-4 in the iNKT cells of SAA bone marrow was signiifcantly higher in medium concentration(50±3)and high concentration(75±3) OCH group than that of the low concentration(33±3) OCH group(P<0.01).Conclusions The quantity and function of NKT cells from children with SAA are lower than that of the healthy children.In vitro, they had better ampliifcation ability and could improve IL-4/IFN-γ imbalance in medium concentration and high concentration OCH group than in low concentration OCH group.

Objective　To investigate the biological characteristics of the serine protease inhibitor 15 (RmS-15) protein of Rhipicephalus microplus, and to perform molecular cloning and prokaryotic expression. Methods RmS-15 gene was amplified and sequenced to construct a phylogenetic tree to understand its evolutionary relationships. Bioinformatic tools were used to analyze the physicochemical properties, signal peptide, secondary and tertiary structure of the RmS-15 protein. In addition, DNA star and ABCpred were used to predict potential B-lymphocyte antigenic epitopes of RmS-15 protein, and potential T-lymphocyte antigenic epitopes were predicted by SYF-PEITHI and IEDB. Finally, the RmS-15 recombinant protein of Rhipicephalus microplus was obtained using the E.coli prokaryotic expression system and purified. Results The RmS-15 gene with 1 212 bp was successfully amplified, encoding a protein comprising 403 amino acids. Phylogenetic tree results indicated high conservation of the RmS-15 protein among different tick amino acid sequences, with the closest phylogenetic relationships to the Rhipicephalus haemaphysaloides and the Rhipicephalus sanguineus. The results of physicochemical property analysis showed a 20-amino acid signal peptide at the N-terminus of the RmS-15 protein, with a relative molecular weight and theoretical isoelectric point of 44 000 and 6.68, respectively. The protein showed an average hydrophilicity of 0.001, classifying it as a stably hydrophilic protein. The results of antigenicity analysis showed that the dominant fragments of B-cell antigenic epitopes of RmS-15 protein were 102-112 aa,147-152 aa and 207-215 aa, and the dominant fragments of T-cell antigenic epitopes were 3-11 aa, 6-14 aa, 27-33 aa, 34-37 aa. Protein expression results showed that RmS-15 protein exhibited high expression levels in the supernatant after induction with 0.8 mmol/L IPTG at 16 ℃ for 24 hours and reached a successful purification with a single band of the protein molecular weight of 44 000. Conclusions The method of prokaryotic expression and purification of RmS-15 protein from Rhipicephalus microplus was successfully established. Bioinformatics analysis demonstrated its strong antigenicity, suggesting its potential to develop as a candidate vaccine for ticks.

Objective To explain the relationship between transformational leadership style of head nurse and subordinate ’ s team performance .Methods A cross-section survey was used to collect data and the structural equation model was used to analyze the data .Results The mean score of the transformational leadership of head nurse was (5.353 ±1.180).The mean score of team performance was (5.619 ±1.178). There was a significant positive correlation between the transformational leadership and team performance (β=0.72,P<0.01).Conclusions Both the level of transformational leadership and team performance were above the average .The transformational leadership of head nurse can help promote subordinate ’ s team performance , so the nursing managers should pay attention to shaping their own leadership style .

Objective To compare the clinicopathological features of signet ring cell gastric carcinoma ( SRCC) with those of non-signet ring cell cancers and explore the prognostic factors of signet ring cell gastric carcinoma.Methods We retrospectively reviewed the medical records of 1447 gastric cancer patients, including gastric signet ring cell and non-signet ring cell cancers.Their clinicopathological characteristics and overall survival data were analyzed.Results The differences in the age, sex, tumor location, depth of invasion, lymph node metastasis, distant metastasis, TNM classification and surgical type were significant between gastric signet ring cell and non-signet ring cell gastric carcinomas.The 5-year survival rate of the patients with gastric signet ring cell carcinoma was 29.6%, while that of the non-signet ring cell cancers was 42.9%(P<0.05).The 5-year survival rate for each stage of gastric signet ring cell carcinoma and non-signet ring cell cancers was 71.0%and 79.3%for stageⅠ, 45.6%and 58.3%for stageⅡ, 16.9%and 29.2%for stageⅢ,and 6.0%and 11.9%for stageⅣcases, respectively, with a significant difference only between stages Ⅲ and Ⅳ cancers ( P<0.05 ) .Multivariate analysis showed that tumor diameter, T stage and N stage were independent prognostic factors for signet ring cell gastric carcinoma. Conclusions The signet ring cell gastric carcinoma has unique clinicopathological features compared with non-signet ring cell carcinoma.Early detection and treatment can improve the prognosis for patients with gastric signet ring cell carcinoma.

Objective To compare the clinicopathological features of signet ring cell gastric carcinoma ( SRCC) with those of non-signet ring cell cancers and explore the prognostic factors of signet ring cell gastric carcinoma.Methods We retrospectively reviewed the medical records of 1447 gastric cancer patients, including gastric signet ring cell and non-signet ring cell cancers.Their clinicopathological characteristics and overall survival data were analyzed.Results The differences in the age, sex, tumor location, depth of invasion, lymph node metastasis, distant metastasis, TNM classification and surgical type were significant between gastric signet ring cell and non-signet ring cell gastric carcinomas.The 5-year survival rate of the patients with gastric signet ring cell carcinoma was 29.6%, while that of the non-signet ring cell cancers was 42.9%(P<0.05).The 5-year survival rate for each stage of gastric signet ring cell carcinoma and non-signet ring cell cancers was 71.0%and 79.3%for stageⅠ, 45.6%and 58.3%for stageⅡ, 16.9%and 29.2%for stageⅢ,and 6.0%and 11.9%for stageⅣcases, respectively, with a significant difference only between stages Ⅲ and Ⅳ cancers ( P<0.05 ) .Multivariate analysis showed that tumor diameter, T stage and N stage were independent prognostic factors for signet ring cell gastric carcinoma. Conclusions The signet ring cell gastric carcinoma has unique clinicopathological features compared with non-signet ring cell carcinoma.Early detection and treatment can improve the prognosis for patients with gastric signet ring cell carcinoma.

Antibodies, Neutralizing/immunology* ; Antibodies, Viral/immunology* ; COVID-19/virology* ; COVID-19 Vaccines/immunology* ; Humans ; SARS-CoV-2/pathogenicity* ; Spike Glycoprotein, Coronavirus/immunology* ; Vaccines, Inactivated/immunology*