Objective To explore the effect of α-zearalanol (α-ZAL) on β-amyloid (Aβ) induced mice and the mechanism. Methods The model was induced by intracerebroventricular injection of Aβ25-35. The mice were divided randomly into sham group, model group, estradiol benzoate (EB) group (Aβ+EB) as a positive control and α-ZAL (Aβ+α-ZAL) group. Morris water maze was used to evaluate the learning and memory ability. The levels of antioxidant enzymes and nitric oxide system in the brain tissue were detected with spectrophotometric and sotopic method. Results The escape latency was longer in the model group than in the control group (P<0.01), and was shorter in the EB group and α-ZAL group than in the model group (P<0.05). Compared with the control group, the level of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) decreased, and the level of malonaldehyde (MDA), constitutive nitric oxide synthase (cNOS), inducible nitrous oxide synthesis (iNOS), and nitric oxide (NO) increased in the model group (P<0.05); compared with the model group, the level of SOD and GSH-Px increased, and the level of MDA, cNOS, iNOS and NO decreased in the EB group and α-ZAL group (P<0.05), except the level of SOD and cNOS in hippocampus in α-ZAL group (P>0.05). There was no significant difference between EB group and α-ZAL group (P>0.05). Conclusion α-ZAL could improve the cognitive behavior in Aβ25- 35 induced mice by increasing the antioxidant activities and decreasing the lipid peroxidation.

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Background and purpose:The effect of TPF (docetaxel, cisplatin and 5-lfuorouracil) induction chemotherapy plus concurrent chemoradiotherapy in locoregionally advanced nasopharyngeal carcinoma is unclear. This study aimed to compare the outcomes and tolerance of neoadjuvant chemotherapy with TPF versus cisplatin and 5-lfuorouracil (PF) followed by concurrent chemoradiotherapy in locoregionally advanced nasopharyngeal carcinoma patients.Methods:Patients with locoregionally advanced nasopharyngeal carcinoma were randomly divided into 2 groups: Group TPF and Group PF. Group TPF: One hundred and sixteen nasopharyngeal carcinoma patients received TPF consisting of docetaxel at 60 mg/m2 on day 1, cisplatin at 60 mg/m2 on day 1, and 5-lfuorouracil at a dose of 750 mg/m2by 24 h continuous infusion for 5 days for 3 cycles with a 21 day interval; Group PF: One hundred and sixteen nasopharyngeal carcinoma patients received PF consisting of cisplatin at 80 mg/m2 on day 1, and 5-lfuorouracil at a dose of 750 mg/m2by 24 h continuous infusion for 5 days for 3 cycles with a 21 day interval. After the completion of neoadjuvant chemotherapy, all the patients received intensity modulated radiation therapy (IMRT) with concomitant chemotherapy consisting of 2 cycles of cisplatin at 80 mg/m2 on day 1 and day 22. The prescribed doses were 6 810 cGy at 2.27 Gy/fraction to the gross tumor volume (GTV) with 5 daily fractions per week for 6 weeks. The acute toxicity and tumor response rate (RR), including complete response (CR) and partial response (PR), were evaluated. Addition-ally, the 5-year progress-free survival (PFS) rates and overall survival (OS) rates were further evaluated.Results:RR of Group TPF was higher than that of group PF at the end of neoadjuvant chemotherapy and within 13 weeks of the completion of concurrent chemoradiotherapy. The median recurrence time of TPF group was 2.98 years, and the 5-year PFS was 84.48%. The median recurrence time of PF group was 2.32 years, and the 5-year PFS was 82.75%. There was no statistically signiifcant difference between the 2 groups (P=0.458). The 5-year OS of TPF group was 87.06%, and for the PF group was 85.34%. There was no statistically signiifcant difference between the 2 groups (P=0.274). The incidence of leukopenia, thrombocyte penia, liver and kidney damage, diarrhea and mucosa necrosis in TPF group were signiifcantly higher than those in PF group (P<0.001). TheⅢ andⅣ degrees adverse reactions in TPF group were sig-niifcantly higher than those in PF group (P<0.001).Conclusion:TPF induction chemotherapy was not superior to the PF regimen for locoregionally advanced nasopharyngeal carcinoma patients. It should not be recommended in terms of more acute toxicity.

Objective To investigate the distribution of critical values of adults in Beijing, to provide the evidence for the formulation of the Standardized Management Guideline in Critical Values, in order to promote the accurate management of critical values.Methods A total of 110 398 data of critical values from the tertiary and above medical institutions during January 1 to May 31 in 2015 in Beijing were collected by the way of on-site inspection, covering the disciplines of hematology, clinical chemistry, coagulation and blood gas analysis.Fristly, the selected critical values were classified by the factor of admission departments and disease types,then were analyzed by using Kruskal-Wallis test, to compare the differences in each group.Secondly,the combined groups were classified by the factor of gender then were analyzed by using Mann-Whithey U test, to compare the differences in each group.Finally, the stratification thresholds of critical values were established.Results Except for the upper limits of Ca, pH, pCO2, Hb and the lower limits of Glu, pH, the rest of thresholds of critical values had significant differences due to different admission departments and disease types and/or gender.Conclusion Depending on the different admission departmentsces disease types and/or gender, hierarchical limit values on each critical value were formulated.

Objective To investigate the expression and aberrant methylation of Ptchl gene in hedgehog signal pathway in carcinogenesis of human gastric cancer.Methods The total RNA and genomic DNA were extracted from 10 human gastric carcinoma tissues,adjacent tissues(＞3 cm from cancerous tissue)and gastric cancer eell line AGS.Ptchl mRNA expression was detected by real-time quantitative reverse transcription PCR.The pattern of CpG island in Ptchl gene 5'regulation sequence was analyzed by software and its methylation extent was tested by bisulfite sequencing PCR.Results The analysis of CpG island(starting-3950 bases upstream of the Ptchl mRNAla transcription start site and ending 2050 bases downstream)revealed that there were two CpG islands in Ptchl gene 5' regulation sequence(first CpG:-1139 bp～+860 bp;second CpG:+875 bp～+1692 bp).Bisulfite sequencing PCR analysis of 19 CpG sites included in the first CpG island(-870 bp～+229 bp)showed that there was methylation present in all cell lines and the average extent of the methylation of these CpG sites was significantly higher in cancerous tissues(64%±32%,ranged 16%～100%)than that in adjacent tissues(13%±14%,ranged 0%～42%,P＜0.05).There was a negative correlation of the Ptchl methylation with its expression.Conclusion The high methylation of Ptchl gene that involves in the carcinogenesis of human gastric carcer will be a new biomarker for gastric carcer.

Objective:To study the value and advantage of color Doppler and cervical multi-slice spiral CT (MSCT) in the diagnosis of cervical lymphadenopathy.Methods:A total of 130 patients with cervical lymphadenopathy diagnosed and treated in the Chenzhou First People′s Hospital from January 2019 to December 2020 were selected and received color Doppler ultrasound examination and MSCT examination. The results of pathological examination were used as the gold standard to compare the efficacy of the two methods in the differential diagnosis of benign and malignant cervical lymphadenopathy.Results:Ultrasound examination of malignant lymph nodes showed irregular boundaries, uneven internal hypoecho, and abundant blood flow signals in lymph nodes; ultrasound examination of benign lymph nodes showed uniform fine dot echo, uniform growth of endothelial medulla, clear and smooth boundary, no blood flow signal or scattered dot blood flow signal. The MSCT images of malignant lymph node showed irregular shape, blurred edge, obvious and uneven enhancement and higher rate of calcification. The aspect ratio of lymph nodes in benign lymph node was significantly higher than that in malignant lymph node (2.14 ± 0.48 vs. 1.92 ± 0.43), and the maximum blood flow velocity (V max), resistance index (RI) and blood flow (BF) in systolic period were significantly lower than those in lymph node [(21.38 ± 3.61) cm/s vs. (23.17 ± 2.55) cm/s, 0.62 ± 0.14 vs. 0.71 ± 0.17, (48.82 ± 13.51) ml/(min·100 g) vs. (65.61 ± 14.64) ml/(min·100 g)], there were statistical differences ( P<0.05). The most common blood flow types was lymphatic hilum type in benign lymph node, the proportion was 51.79% (29/56), while the most common type in malignant lymph node was marginal type and central type, the proportion was 44.59% (33/74) and 25.68% (19/74). The sensitivity, specificity, accuracy and Kappa value of ultrasound combined with MSCT in diagnosis were 92.86%, 95.95%, 94.62% and 0.890. Conclusions:Both color Doppler ultrasonography and MSCT can differentiate the benign and malignant of cervical lymph node lesions with better parameters such as lymph node imaging characteristics and blood flow distribution pattern, but the combined diagnosis has higher sensitivity, specificity and accuracy.