Research on laboratory animals is an important issue in biomedicine.Children are a special drug-using population.The selection of suitable experimental animals is a key issue to ensure the scientific quality of research for pediatric drugs.Based on the review of a large number of literature, the authors summarized the application of suckling mice in the pharmacological research and toxicological evaluation of pediatric drugs for the treatment of common diseases in children.We also summarized the existing problems in pediatric toxicology and proposed solutions for providing a reference of test animal application in pediatric drug research.

Objective: To compare the methods of metabolic balance (MB) and fecal monitoring (FM) for evaluating the dietary zinc (Zn) absorption in Tibetan men. Methods: In 14 d field trial on 16 adult Tibetan men, capsules of carmine were given to mark the feces from D4 to D12, and samples of diet, water, feces and urine were collected during the period. In addition, 4.0 mg zinc tracer (enriched with 67Zn) and 1.0 mg recovery indicator ytterbium (Yb) were orally administrated to the subjects in the evening meal of the D5. The ratio of 67Zn/68Zn in fecal samples was determined by inductively coupled plasma mass spectrometry, and then the zinc absorption was calculated based on the principle of isotope dilution. Results: The dietary zinc absorption in Tibetan men was (23.8?3.9) % evaluated by MB and (21.4?4.3) % by FM with significant difference (by paired-samples t test) and linear correlation (Pearson). The unabsorbed zinc tracer and Yb had the similar behavior through the digestive tract, mostly excreted within5 d following the intake. Conclusion: In the 14d metabolic period, the dietary zinc absorption from MB was a little higher than that from FM. Using FM, the metabolic period can be shortened to 4-5 days according to excretion of Yb. Both methods suggested that the dietary zinc absorption in the adult Tibetan men was good.

Objective By summarizing experimental data of animal models of type 2 diabetes mellitus(T2DM)and its microvascular complications in rats and mice as animal models,the biochemical indexes were analyzed in order to provide theoretical reference for future experiments.Methods The main topics of"type 2 diabetes""diabetic nephropathy""diabetic foot"and"diabetic retinopathy"were searched on China National Knowledge Infrastructure and PubMed databases to screen out the journal literatures related to T2DM and microvascular complications in clinical and animal experiments published from October 31,2019 to October 31,2022.The subjects,disease types,detection indicators and other contents recorded in the literature were sorted out and summarized,and a database was established for statistical analysis.Results A total of 510 literatures were selected,among which fasting blood glucose was the most frequently used biochemical index in T2DM experiment,urine protein level was the most frequently used biochemical index in diabetic nephropathy experiment,and serum inflammatory factors were the most frequently used biochemical index in diabetic foot and diabetic retinopathy experiment.Conclusions By analyzing the application frequency of biochemical indicators in T2DM and its microvascular complications,this study can provide an important reference for clinical diagnosis and treatment of the disease and the development of animal experiments.