【Objective】 To analyze the serological characteristics and molecular mechanism of a novel B subtype allele 803delC. 【Methods】 ABO blood group was detected by serological method. Sequence-specific primer polymerase chain reaction (PCR-SSP) was used to detect ABO blood group genes. The coding region of exon 1-7 of ABO gene was detected by Sanger sequencing to determine the mutation site. 【Results】 Serological identification of patients was with forward O-type and reverse B-type. The result of PCR-SSP genotyping was A/O. There was A gene, which was not consistent with serological results. Further Sanger double-strand sequencing revealed that the C-base was deleted at position 803 of exon 7 on the basis of ABO^*B. 01/ABO^*O. 01.01. The mutation eventually leads to the amino acid substitution of p. Ala268Gly and p. Phe269Ser and the production of new open reading frame starting at position 269, with the new open reading frame No.20 amino acid being stop codon, resulted in the termination of B gene expression. Further single-strand sequencing of the ABO gene revealed that the mutation was located in the ABO^*B. 01 gene. The mutation was submitted to the NCBI database with the number OR343908. 【Conclusion】 A new ABO allele leading to B variant has been found in Chinese population. Genetic detection can be used to identify the ambiguous blood group with discrepancy between forward and reverse blood grouping.

Using methylated pyrroloxicam as a starting material and following the principles of drug design such as bioisosterism and active site binding,we designed and synthesized ten structurally novel target compounds,whose structures were characterized by 1H NMR and MS analysis.The in vitro antitumor activity of these title compounds was evaluated by measuring their inhibitory activity against pancreatic cancer cells Capan-1,leukemia cells L1210,and human liver cancer cells SMMC-7721.The results showed that compound 6f(IC50=4.8±0.5 μmol/L)exhibited good inhibitory activity against Capan-1 pancreatic cancer cells,that compound 6b(IC50=2.6±0.3 μmol/L)showed good inhibitory activity against L1210 leukemia cells,and that compound 6c(IC50=2.1±0.2 μmol/L)displayed good inhibitory activity against SMMC-7721 human liver cancer cells.These preliminary results from the antitumor activity experiments suggest that the introduction of benzothiazine derivatives plays a certain role in enhancing the antitumor activity of this class of compounds.

Objective:To investigate the current status and problems of the development of dental technology specialty in higher vocational colleges in China, and to provide a reference for the establishment of national standards for vocational education on dental technology and the development of high-quality higher vocational education.Methods:We selected 54 higher vocational colleges in eastern, central, and western China offering dental technology programs by stratified random sampling to survey the specialty development situation using a questionnaire. Data were analyzed using the independent samples t test, one-way analysis of variance, or chi-square test with the use of SPSS 18.0. Results:Among the surveyed colleges, the average annual enrollment scale in recent three years was 6 415 students, with the largest enrollment in western regions, accounting for 47.39%. In terms of teaching faculty, there were differences in educational attainment, professional title structure, vocational qualification, and professional background between different regions ( P<0.05). Regarding training conditions, only 26.42% and 3.77% of colleges were equipped with virtual simulation training rooms and dental materials training rooms, respectively; and 18.52% and 22.22% of colleges were equipped with chairside repair systems and virtual simulation software, respectively. Conclusions:Regional imbalances exist in the development of dental technology specialty in higher vocational colleges in China. The overall level of teaching staff, practical training conditions, and curriculum construction need to be improved.

The traditional Chinese medicine （TCM） in pediatric care has a long history，proven efficacy，and distinctive characteristics.The China Association of Chinese Medicine has organized a series of youth salons to discuss the clinical advantages of treating diseases.Experts at this seminar proposed that the superior disease categories in pediatric TCM are significant for showcasing the unique strengths and advantages of TCM in the treatment of pediatric diseases，enhancing diagnostic and treatment levels，inheriting TCM knowledge，promoting the integration of TCM and Western medicine，and meeting patients' needs.The strengths of pediatric TCM are summed up as "having what others do not，excelling at what others have，being special in what others excel at，and ensuring safety in what others specialize in." The scope of superiority in pediatric TCM covers multiple systems，including respiratory，digestive，endocrine，psychological，and dermatological systems.This article summarized the advantages of TCM in treating 13 diseases discussed in the salon，such as upper respiratory tract infections，coughs，pneumonia，allergic rhinitis，bronchial asthma，atopic dermatitis，functional dyspepsia，functional constipation，enuresis，marginal short stature，simple obesity，attention deficit hyperactivity disorder，and tic disorders.The overall advantages were reflected in three aspects：First，the holistic concept and treatment based on syndrome differentiation in TCM highlight the advantage of treating the root causes of diseases，making the treatment methodical and precise.Second，most traditional Chinese herbs are natural and have strong safety profiles.Third，TCM treatment methods are abundant，especially the external treatment methods，which are widely used in pediatrics，highly accepted by parents，and have definite efficacy，as well as good safety and compliance.

Objective To explore the risk factors of perioperative blood transfusion in patients with recurrent nasopharyngeal carcinoma undergoing nasal endoscopic surgery,and construct a nomogram predic-tion model.Methods A retrospective analysis was conducted on the clinical data of 262 patients who un-derwent the nasal endoscopic surgery from January 2021 to May 2023.The patients were divided into two groups according to perioperative blood transfusion or not:non-transfusion group and transfusion group.Uni-variate and multivariate logistic regression were conducted to identify independentrisk factors of perioperative blood transfusion,and a nomogram prediction model was developed.The receiver operating characteristic(ROC)curve was drawn,and the area under the curve(AUC)was calculated.Results The incidence of blood transfusion in patients with recurrent nasopharyngeal carcinoma undergoing nasal endoscopic surgery was 46(17.6％).Multivariate logistic regression analysis revealed that preoperative hemoglobin level 70 to＜100 g/L(OR=6.178,95％CI 2.271-16.805,P＜0.001),preoperative albumin level 25 to＜35 g/L(OR=2.126,95％CI 1.021-4.424,P=0.044),and classification of surgery grade Ⅲ or Ⅳ (OR=4.725,95％CI 1.634-13.584,P=0.004)were independent risk factors for predicting perioper-ative blood transfusion in patients with recurrent nasopharyngeal carcinoma undergoing nasal endoscopic sur-gery.The AUC of the nomogram model was 0.769(95％CI 0.701-0.838),the sensitivity was 67.6％,and the specificity was 76.1％.Conclusion Preoperative hemoglobin level 70 to＜100 g/L,preoperative albumin level 25 to＜35 g/L,and classification of surgery grade Ⅲ or Ⅳ are independent risk factors of perioperative blood transfusion in patients with recurrent nasopharyngeal carcinoma undergoing nasal endo-scopic surgery.The nomogram model established based on the above risk factors has good predictive ability for perioperative blood transfusion.

Objective To observe the therapeutic effect of neuromuscular electrical stimulation (NMES) combined with Flexi-bar exercise training on postpartum diastasis recti abdominis (DRA). Methods A total of 120 postpartum DRA patients were selected and randomly divided into observation group (60 cases) and control group (60 cases). Patients in the control group received NMES treatment, while those in the observation group received NMES treatment combined with Flexi-bar exercise therapy. The therapeutic effects between the two groups were compared after 6 weeks of continuously treatment. Results Before treatment, there was no significant difference in the distance between the rectus abdominis muscles at 4 cm above and below the umbilicus, or at the level of the umbilicus between two groups (P>0.05); after treatment, those distances were significantly reduced, and the distance between the rectus abdominis muscles at 4 cm above and below the umbilicus in the observation group were smaller than control group (P < 0.05). There were no significant differences between the two groups in terms of upper abdominal circumference, middle abdominal circumference, lower abdominal circumference, rectus abdominis root mean square (RMS), maximum muscle strength of classⅠmuscle fibers of pelvic floor, average muscle strength of class Ⅱ muscle fibers of pelvic floor, and 36-item Shot-form Health Status Survey(SF-36) scores before treatment (P>0.05); after treatment, the upper abdominal circumference, middle abdominal circumference and lower abdominal circumference of the two groups were decreased than those before treatment, and were lower in the observation group compared to the control group (P < 0.05). The rectus abdominis RMS, maximum muscle strength of class Ⅰ muscle fibers of pelvic floor, average muscle strength of class Ⅱ muscle fibers of pelvic floor, and SF-36 scores of the two groups were increased than those before treatment, and were higher in the observation group compared to the control group (P < 0.05). Conclusion NMES combined with Flexi-bar exercise training on postpartum DRA has significant therapeutic effect, which is helpful to enhance the abdominal muscle strength and improve the quality of life of patients.

【Objective】 To analyze the dynamics of specific SARS-CoV-2 IgG antibodies in blood donors in Fuzhou area after receiving booster doses of inactivated COVID-19 vaccine and breakthrough infections, and to provide evidence for the timing of the collection of specific immune plasma or convalescent plasma and the subsequent vaccine doses. 【Methods】 A total of 109 volunteers who received the first booster dose of inactivated COVID-19 vaccine and 102 volunteers who experienced breakthrough infections were recruited at Fujian Blood Center from October to November 2021. Blood samples were collected at eight time points: 14 (11, 20) days before the booster dose (Time0), 14 (10, 23) days after the booster dose (Time1), 53 (45.5, 61) days after the booster dose (Time2), 88 (78, 101.5) days after the booster dose (Time3), 124 (112.5, 138.5) days after the booster dose (Time4), 158 (146, 174) days after the booster dose (Time5), 194 (179.5, 214) days after the booster dose (Time6) and within one month after the breakthrough infection (Time7). Serum SARS-CoV-2 IgG antibodies were detected using a chemiluminescence immunoassay. The dynamics of antibody levels were analyzed and the effects of age, gender, weight, BMI, blood type and smoking on antibody levels were also analyzed. 【Results】 The positive rate of SARS-CoV-2 IgG antibodies was 53.2% (58/109) at Time0, 100% (109/109) at Time1, and 95.4% (104/109) at Time6. The antibody levels were significantly higher at Time1 and Time6 than at Time0 (P<0.001). The highest level was observed at Time1, followed by a gradual decrease until Time2-Time6, which were 89.9% (9.74/10.84), 77.7% (8.42/10.84), 68.3% (7.4/10.84), 59.4% (6.44/10.84), and 53.9% (5.84/10.84) of the peak value at Time1 (P<0.001). There were no significant differences in IgG antibody levels among different gender, weight, BMI, age, blood type and smoker or non-smoker at the same time points (P values all >0.05). The IgG antibody level at Time7 was 2.07 times than that at Time1 (P<0.001). There were no significant differences in IgG antibody levels between asymptomatic groups and symptomatic groups and also between fever-free groups and fever groups (P values all >0.05). The IgG antibody level in breakthrough infection group was significantly higher than that in non-breakthrough infection group (P<0.001). 【Conclusion】 Booster doses of inactivated COVID-19 vaccine and breakthrough infections can stimulate stronger immune responses in the body. It is recommended to collect specific immune plasma or convalescent plasma within one month after breakthrough infections or booster doses of COVID-19 vaccine for special purposes. The timing of subsequent vaccine doses should be based on the dynamics of antibody levels. It is necessary to continuously monitor antibody levels to provide evidence for subsequent vaccine doses.

To investigate the cellular target selectivity of small molecules targeting thioredoxin reductase 1, we reported the construction and functional research of a stable TrxR1 gene (encode thioredoxin reductase 1) knockout HCT-116 cell line. We designed and selected TrxR1 knockout sites according to the TrxR1 gene sequence and CRISPR/Cas9 target designing principles. SgRNA oligos based on the selected TrxR1 knockout sites were obtained. Next, we constructed knockout plasmid by cloning the sgRNA into the pCasCMV-Puro-U6 vector. After transfection of the plasmid into HCT-116 cells, TrxR1 knockout HCT-116 cells were selected using puromycin resistance. The TrxR1 knockout efficiency was identified and verified by DNA sequencing, immunoblotting, TRFS-green fluorescent probe, and cellular TrxR1 enzyme activity detection. Finally, the correlation between TrxR1 expression and cellular effects of drugs specifically targeting TrxR1 was investigated by CCK-8 assay. The results demonstrated that the knockout plasmid expressing the sgRNA effectively knocked-out TrxR1 gene within HCT-116 cells, and no expression of TrxR1 protein could be observed in stable TrxR1 knockout HCT-116 (HCT116-TrxR1-KO) cells. The TrxR1-targeting inhibitor auranofin did not show any inhibitory activity against either cellular TrxR1 enzyme activity or cell proliferation. Based on these results, we conclude that a stable TrxR1 gene knockout HCT-116 cell line was obtained through CRISPR/Cas9 techniques, which may facilitate investigating the role of TrxR1 in various diseases.
CRISPR-Cas Systems/genetics* ; Gene Editing ; Gene Knockout Techniques ; HCT116 Cells ; Humans ; RNA, Guide/metabolism*

Objective:To evaluate the diet quality of patients with Type 2 diabetes mellitus (T2DM) in the community with the Chinese Dietary Balance Index (DBI-16) and to provide a scientific basis for nutrition education.Methods:A random cluster sampling method was adopted to conduct a questionnaire survey of 332 T2DM patients in a community of Bengbu City to obtain demographic sociology and dietary intake information. DBI-16 was used to score and evaluate dietary structure and diet quality.Results:There are low-level under-intake (low bound score =14.0) and excessive intake (high bound score =14.0) in the diet of this population. The degree of excessive intake of men (high bound score =15.0) was higher than that of women (high bound score=13.0) ( Z=-3.12, P<0.01), and the degree of insufficient diet (low bound score =13.0) was lower than that of women (low bound score=15.5)( Z=-2.05, P<0.05). Those with monthly income<1 000 (low bound score =15.5) patients ( χ2 =6.34, P<0.05) and disease course>10 years (low bound score =16.0) had the highest degree of insufficient dietary intake ( χ2 =9.40, P<0.01). Those who did not participate in community health education lectures had significantly higher dietary intake (low bound score =15.0) and imbalance (diet quality distance= 29.0) than those who participated in community health education (low bound score=13.0)(diet quality distance=27.0)( Z=-2.46, P<0.01). According to the score distribution of the DBI-16 index, 73.6% of patients had a severe over-intake of cereals, and only 27.4% and 27.7% had intake of vegetables, fruits, and milk beans that reached the recommended intake. The dietary pattern mainly reflects the existence of a certain degree of excessive dietary intake pattern D. Conclusion:The dietary quality of T2DM patients in Bengbu′s community is in a state of low imbalance. Insufficient and excessive dietary intake coexist and urgently need to be improved.

Objective:To explore early-onset gout and related risk factors in Shandong Province, and provide decision-making information on prevention.Methods:Data from electronic medical records and face-to face interview were collected from 8 393 patients with gout who first visited the gout clinic of the Affiliated Hospital of Qingdao University from September 2016 to December 2021. Data included demographics, comorbidity and biochemical examinations. The dynamic changes of onset age from 2002 to 2021 were statistically analyzed. The clinical characteristics and related risk factors of patients with early-onset and late-onset gout were statistically analyzed.Results:The age of onset of gout decreased significantly from 2002 to 2021. Compared with 2002, the average age of onset in 2021 decreased by 2.3 years [(41.9±10.6 vs 39.6±14.0) years]. The median age of onset decreased by 3 years in 2012-2021 compared with 2002-2011(37 vs 40 years, P<0.001). The proportion of gout patients with onset age<40 years old increased significantly, from 45.1% in 2002 to 57.8%, and increased by 12.7% in 20 years( P<0.001). The constituent ratios of 20-29 years old group( Ptrend<0.001) and≤19 years old group( Ptrend=0.011) increased by 9.3%( P<0.001) and 4.2%( P=0.002) over 20 years, which was the highest increase among all age groups with onset age<40 years old. Multivariate stepwise linear regression analysis showed that positive family history, blood uric acid level, metabolic syndrome and smoking were independent risk factors for early onset of gout. Conclusion:The age of gout onset in tends to be younger. The increase of the proportion of patients younger than 30 years old is probably the key factor leading to the early-onset gout in Shandong Province. Early and effective intervention on the risk factors related to early-onset gout is essential to prevent the early-onset gout as well as to reduce the prevalence of gout and complications.