[Objective] To explore the relationship between anti-HEV antibody reactivity rate and different age groups in Chinese voluntary blood donors by Meta-analysis. [Methods] Literatures on anti-HEV IgG reactivity rate and anti-HEV IgM reactivity rate of voluntary blood donors in different age groups in China were searched from China National Knowledge Infrastructure (CNKI), PubMed and Wanfang Medicine database, with a search time from January 1, 2007 to December 31, 2023. Risk difference (RD) was selected as the effect size after grouping the included literature according to age, and meta-analysis was performed using Review Manager 5.3 software. [Results] A total of 17 articles were included, among which 16 were about anti-HEV IgG and 15 about anti-HEV IgM. Based on different age grouping methods, they were divided into two groups. The age groups of group A were divided into ≤ 20 years old, 21-30 years old, 31-40 years old, 41-50 years old and >50 years old. The age groups of group B were divided into 18-25 years old, 26-35 years old, 36-45 years old, and ≥46 years old. The pooled results of Meta-analysis showed that the RD value of anti-HEV IgG reactivity rate in group A was 22.92% [95% CI (19.02%, 26.82%)], and the RD value of anti-HEV IgM reactivity rate was 0.67% [95% CI (0.51%, 0.82%)]. The RD value of anti-HEV IgG reactivity rate in group B was 33.03% [95% CI (28.01%, 38.05%)], and the RD value of anti-HEV IgM reactivity rate was 1.13% [95% CI (1.05%, 1.21%)]. The results of subgroup analysis showed that in both group A and B, the anti-HEV IgG reactivity rate in voluntary blood donors increased with age. In group A, no increase in the reactivity rate of anti-HEV IgM with age was found in voluntary blood donors. In group B, the anti-HEV IgM reactivity rate increased with age. Further analysis showed that in the two groups of A and B, the anti-HEV IgM reactivity rate increased with age in areas where the anti-HEV IgM reactivity rate was greater than 1%. [Conclusion] The anti-HEV IgG reactivity rate and anti-HEV IgM reactivity rate in voluntary blood donors increased with age.

Objective To evaluate the gender differences in fat water fraction(FWF)related to fat metabolism in supraclavicular region of neck with iterative decomposition of water and fat with echo asymmetry and least square estimation iron quantification(IDEAL-IQ)sequence quantitatively.Methods Twenty healthy female and twenty healthy male volunteers were selected for a MRI examination with IDEAL-IQ,then the FWF of R2*,brown adipose tissue(BAT)and white adipose tissue(WAT)were obtained by post-processing.The differences of FWF between the two groups were compared by Mann-Whitney U test.Results There was sig-nificant difference in the FWF of BAT and WAT between the two groups(P＜0.05).The FWF of BAT in the female was higher than that the male,and the FWF of WAT in the male was higher than that the female,there was no significant difference in the R2*between the two groups(P＞0.05).Conclusion IDEAL-IQ sequence can be used to evaluate the FWF in supraclavicular region of neck quantitatively,and classify BAT and WAT,then provide clinical according to the quantitative study of fat content.

Cell membrane affinity chromatography has been widely applied in membrane protein (MP)-targeted drug screening and interaction analysis. However, in current methods, the MP sources are derived from cell lines or recombinant protein expression, which are time-consuming for cell culture or purification, and also difficult to ensure the purity and consistent orientation of MPs in the chromatographic stationary phase. In this study, a novel in situ synthesis membrane protein affinity chromatography (iSMAC) method was developed utilizing cell-free protein expression (CFE) and covalent immobilized affinity chromatography, which achieved efficient in situ synthesis and unidirectional insertion of MPs into liposomes in the stationary phase. The advantages of iSMAC are: 1) There is no need to culture cells or prepare recombinant proteins; 2) Specific and purified MPs with stable and controllable content can be obtained within 2 h; 3) MPs maintain the transmembrane structure and a consistent orientation in the chromatographic stationary phase; 4) The flexible and personalized construction of cDNAs makes it possible to analyze drug binding sites. iSMAC was successfully applied to screen PDGFRβ inhibitors from Salvia miltiorrhiza and Schisandra chinensis. Micro columns prepared by in-situ synthesis maintain satisfactory analysis activity within 72 h. Two new PDGFRβ inhibitors, salvianolic acid B and gomisin D, were screened out with K _D values of 13.44 and 7.39 μmol/L, respectively. In vitro experiments confirmed that the two compounds decreased α-SMA and collagen Ӏ mRNA levels raised by TGF-β in HSC-T6 cells through regulating the phosphorylation of p38, AKT and ERK. In vivo, Sal B could also attenuate CCl₄-induced liver fibrosis by downregulating PDGFRβ downstream related protein levels. The iSMAC method can be applied to other general MPs, and provides a practical approach for the rapid preparation of MP-immobilized or other biological solid-phase materials.