Quantitative clinical evaluation method for small intestine capsule endoscope / 医疗卫生装备

Objective To study the quantitative clinical evaluation method for the photography performance of the small intestine capsule endoscope.Methods Two mainstream small intestine capsule endoscopes in the world were placed into a pure black and light-free environment to simulate the movement of the capsule endoscopes in the digestive tract,and the images were captured to analyze the changes in the transmission frame rate and lighting flicker time of the capsule endoscopes,then a quantitative clinical evaluation method for the photography performance of the small intestine capsule endoscope was proposed based on the study results.Results The China-made capsule endoscope showed a decrease in transmission frame rate after 4 min of operation,and each frame corresponded to a lighting flicker of variable duration;the capsule endoscope from other countries had not any obvious decrease in transmission frame rate,and each frame corresponded to a lighting flicker of fixed duration and another one of variable duration.In case of large differences in optical reflection characteristics,the China-made endoscope required 2-12 frames to adjust exposure,while the other endoscope was able to adjust exposure immediately.Based on the results above a method was proposed for quantitatively evaluating the images obtained from the capsule endoscopes at static and dynamic states in terms of photography performance and video performance.Conclusion Quantitatively evaluating the performance of capsule endoscopes in gastrointestinal scenarios with highly variable optical reflectance characteristics contributes to reflecting their clinical value,and a new idea is provided for performance comparison and clinical evaluation of capsule endoscopes.[Chinese Medical Equipment Journal,2023,44(10):28-32]

Expression of miR-140-5p and prediction of its target gene in human mesenchymal stem cells during adipogenic differentiation / 南方医科大学学报

<p><b>OBJECTIVE</b>To screen the differentially expressed miRNAs and their target genes in adipogenic differentiation of human bone marrow mesenchymal stem cells (hMSCs) to better understand the mechanism for regulating the balance between osteoblast and adipocyte differentiation.</p><p><b>METHODS</b>Cultured hMSCs were induced for adipogenic differentiation, and at 0, 7, 14, and 21 days of induction, the cells were examined for miRNA and mRNA expression profiles using miRNA chip and transcriptome sequencing (RNA-seq) techniques. Correlation analysis was carried out for the miRNAs and mRNAs of potential interest. The databases including TargetScan, PicTar and miRanda were used to predict the target genes of the differentially expressed miRNA.</p><p><b>RESULTS</b>The expression of miR-140-5p was down-regulated and leukemia inhibitory factor receptor (LIFR) expression increased progressively during adipogenic differentiation of hMSCs, showing a negative correlation between them. Target gene prediction using the 3 databases identified LIFR as the target gene of miR-140-5p.</p><p><b>CONCLUSION</b>miRNA-140-5p may play an important role by regulating its target gene LIFR during adipogenic differentiation of hMSCs.</p>

Safety and immunogenicity of combined hepatitis A and hepatitis B vaccine according to 0 and 6 months schedule in healthy children / 中华预防医学杂志

<p><b>OBJECTIVE</b>To evaluate the safety and immunogenicity of the Bilive(TM) combined hepatitis A and hepatitis B vaccine in healthy children.</p><p><b>METHODS</b>A total of 116 healthy children aged 1 - 10 years, who, without history of hepatitis A vaccine vaccination and anti-HAV negative, had completed the full immunization of hepatitis B vaccine were recruited in city of Changzhou in Jiangsu province. The Bilive(TM) combined hepatitis A and hepatitis B vaccine was administered according to a two-dose schedule (0, 6 months). The dosage was 250 U for hepatitis A antigen and 5 microg for hepatitis B surface antigen. The potential adverse effects were observed within 72 hours after vaccination. The serum samples were collected for the testing of anti-HAV and anti-HBs at month 1, 6 and 7 after initial dose.</p><p><b>RESULTS</b>The local and systemic adverse reactions after immunization were slight and temporary. The rates of local and systemic adverse reactions were 12.1% (14/116) and 6.0% (7/116). The sero-conversion rates of HAV were from 92.9% (92/99) to 100.0% (101/101) and the geometric mean titers (GMT) ranged from 47.0 mIU/ml to 2762.3 mIU/ml 1, 6, 7 months after initial dose. The sero-protection rate of HBV was 86.1% (87/101) before vaccination and came up to 100.0% (101/101) one month after initial dose, and the GMTs of HBV were from 894.3 mIU/ml to 3314.3 mIU/ml 1, 6, 7 months after initial dose.</p><p><b>CONCLUSION</b>The Bilive(TM) combined hepatitis A and hepatitis B vaccine has good safety and immunogenicity in healthy children who had preexisting immunity to hepatitis B virus.</p>