Separation, characterization and anti-psoriasis effect of self-assembled nanoparticles from Shaoyao Gancao Decoction / 中国中药杂志

This study aims to separate and characterize self-assembled nanoparticles(SAN) from Shaoyao Gancao Decoction(SGD) and determine the content of active compounds. Further, we aimed to observe the therapeutic effect of SGD-SAN on imiquimod-induced psoriasis in mice. The separation of SGD was performed by dialysis, and the separation process was optimized by single factor experiment. The SGD-SAN isolated under the optimal process was characterized, and the content of gallic acid, albiflorin, paeoniflorin, liquiritin, isoliquiritin apioside, isoliquiritin, and glycyrrhizic acid in each part of SGD was determined by HPLC. In the animal experiment, mice were assigned into a normal group, a model group, a methotrexate group(0.001 g·kg~(-1)), and SGD, SGD sediment, SGD dialysate, and SGD-SAN groups of different doses(1, 2, and 4 g·kg~(-1)) respectively. The psoriasis grade of mice was evaluated based on the pathological changes of skin lesions, the content of inflammatory cytokines, organ index and other indicators. The results showed that SAN obtained by centrifugation at 13 000 r·min~(-1) for 30 min was stable after dialysis for 4 times, which were uniform spherical nanoparticles with the particle size of(164.43±1.34) nm, the polydispersity index of(0.28±0.05), and the Zeta potential of(-12.35±0.80) mV. The active compound content accounted for more than 70% of SGD. Compared with the model group, SAN and SGD decreased the skin lesion score, spleen index, and inflammatory cytokine levels(P<0.05 or P<0.01) and alleviated the skin thickening and infiltration of inflammatory cells. However, the sediment group and the dialysate group had no obvious effect. SGD showed a good therapeutic effect on imiquimod-induced psoriasis in mice, and SAN demonstrated the effect equivalent to SGD in a dose-dependent manner. Therefore, we conclude that the SAN formed during decocting is the main active form of SGD, which can lower the levels of inflammatory cytokines, promote the normal differentiation of keratinocytes, and reduce the infiltration of inflammatory cells in the treatment of psoriasis lesions in mice.

HPV Genotyping and Clinical Studies of Women in Yan'an Area / 现代检验医学杂志

Objective To contrast HPV genotyping and clinical characteristics of women in Yan'an and provide data support for cervical cancer screening and prevention.Methods The genotyping of HPV infection was carried out by the method of PCR amplification and reverse hybridization.To statistical analysis clinical infection distribution data.Results Found 16.48％ (332 of 2014) were positive for HPV DNA in these women.HPV-16,52 and 53 were in the top three HPV high-risk types.HPV-81,6 and 44 were in the top three HPV low-risk types.There were 219 cases (65.96％) with pure high-risk type infection,74 cases (22.29％) with pure low-risk type infection and 39 cases (11.75％) with mixed infection in positive specimens.The HPV infection rate had showed first increasing then decreasing with age,and there were significant differences among the each groups (x2=34.238,P＜0.01).There were also differences in HPV positive detection rates in different occupations and there were significant differences among the each groups (x2=50.35,P＜0.01).There were also differences in HPV positive detection rates in different regions,and there were significant differences among the each groups (x2 =12.084,P＜0.05).Single infection was highest in HPV infection.Conclusion HPV infection was different in different populations,regions and ages,and it is of great significance to carry out HPV screening for early prevention and treatment of cervical cancer.