Objective To observe the immunoglobulin A secreting cells (IgASCs) and secretory IgA (sIgA) level in jejunum of mice infected with plerocercoids,and to understand the roles of resistance to invasion processes of the plerocercoids.Methods A total of 100 Kunming mice (half males and half females) were chosen,the weight was 20-25 g,they were randomly divided into control and experiment groups according to their body weight via the random number table method,50 per group.Mice of experiment group were fed each with 5 plerocercoids in snakes,and mice of control group were not infected,testing time and methods were the same in the two groups.Ten mice were randomly sacrificed from one group on days 1,7,14,28 and 56 after infection,to collect empty intestinal juice and jejunal segment.The immunohistochemical method was used to examine the quantity of IgASCs in jejunal mucosa,while enzyme-linked immunosorbent assay (ELISA) was applied to test the level of slgA of jejunal fluid.Results The IgASCs were distributed in lamina propria of the jejunal mucosa,and the percentage of positive IgASCs reached the peak value [(64.24 ± 0.60)％] at d 1 after infection in experiment group,then decreased,and it was lower than control group at d 14 [(41.98 ± 0.42)％ vs (43.52 ± 0.94)％,t =-4.727,P ＜ 0.01].The sIgA level reached the peak value [(22.05 ± 1.43) mg/L] at d 7 after infection in experiment group,then decreased,and there was no statistical significant difference between control and experiment groups at d 56 [(20.00 ± 0.42) mg/L vs (21.26 ± 2.59) mg/L,t =1.516,P ＞ 0.05].There was a positive correlation between the percentage of positive IgASCs in the jejunal mucosa and sIgA level in the jejunal fluid at d 7 after infection (r =0.663,P ＜ 0.01),and there was a negative correlation between them at d 14 after infection (r =-0.542,P ＜ 0.05).Conclusion The plerocercoids infection might induce high level expressions of IgASCs and sIgA,they show positive correlation at d 7 after infection.

This study was aimed to establish an HPLC method for simultaneous content determination of valtrate, acevaltrate, and their degradation products, which were baldrinal and 11-ethoxyviburtinal, in Valeriana jatamansi Jones. The separation and quantification of 4 constituents mentioned above were performed on an Agilent ZORBAX SB-C18 (4.6 mm×250 mm, 5 μm). The mobile phase consisted of water (A) - acetonitrile (B) with an optimized gradient program. The flow rate was 1 mL·min-1. The column temperature was set at 25℃. The wavelength was set at 241 nm. And the injection volume was 10μL. The results showed that among 14 different places of V. jatamansi, the 4 contents determined were different. The contents of valtrate, acevaltrate, and baldrinal in the Yunnan Baoshan Mount were the highest. And the content of 11-ethoxyviburtinal was the highest in Yunnan Dali. It was concluded that the method was with good precision, reproducibility and stability. And it was suitable for the determination of 4 valepotriates ingredients in V. jatamansi. It also provided references for the quality control and exploitation of V. jatamansi.

Objective The evaluation of lymph node properties before lung cancer surgery has a great impact with the choice of surgical methods.Although there are various examination methods,many methods have invasive or accuracy problems.In order to improve the accuracy of diagnosis,we mainly discuss the value of wide-body spectral CT in the differential diagnosis of mediastinal metastatic lymph nodes,non-metastatic lymph nodes in lung cancer patients and reactive hyperplastic lymph nodes.Methods The clinical and imaging data of 64 patients with lung cancer and 28 patients with pulmonary inflammatory lesions were retrospectively analyzed.All patients underwent plain scan and enhanced dual-phase spectral CT scan.The size,density,three-phase IC,NIC,and λHU of lymph nodes in metastatic,non-metastatic and inflammatory reactive hyperplasia groups were measured on 70 keV single-energy images and iodine-based images,respectively.The single-factor variance and Kruskal-Wallis H rank sum test were used to analyze and compare the differences.Results The short diameter of metastatic lymph nodes was larger than that of non-metastatic lymph nodes and reactive hyperplastic lymph nodes(P<0.001).The plain scan density of reactive hyperplastic lymph nodes was higher than that of metastatic lymph nodes(P<0.001),but there was no significant difference between non-metastatic lymph nodes(P=0.325).The CT values of reactive hyperplastic lymph nodes in arterial phase and venous phase were higher than those of metastatic and non-metastatic lymph nodes(P<0.05).Except for NIC in arterial phase,IC,NIC and λHU in plain scan,IC and λHU in arterial phase,IC,NIC and λHU in venous phase of reactive hyperplastic lymph nodes and metastatic lymph nodes were statistically significant(all P<0.05).There was no significant difference in IC,NIC and λHU between reactive hyperplastic lymph nodes and non-metastatic lymph nodes in plain scan,arterial phase and venous phase(all P>0.05).Conclusion The quantitative and spectral curve slope of iodine in mediastinal metastatic lymph nodes of lung cancer were basically lower than those in reactive hyperplastic lymph nodes.The quantitative parameters of spectral CT had certain diagnostic efficacy in differentiating metastatic lymph nodes and reactive hyperplastic lymph nodes,while the spectral parameters of non-metastatic lymph nodes and reactive hyperplastic lymph nodes were not statistically significant.