Objective An analysis was conducted to investigate the iodine nutrition level of children aged 8 - 10 in low-coverage area of iodized salt of Yushu Qinghai province for providing a scientific basis for the development of effective preventive measures. Methods Yushu, Chengduo, Nangqian and Zaduo counties with higher non-iodized salt coverage rate in Yushu Qinghai province were chosen as survey counties in 2009. Three townships were selected in each county, and 2 primary schools were selected in each township and 40 urine samples of children aged 8-10 were collected randomly in each primary school. The content of urinary iodine was analyzed by As-Ce catalytic spectrophotometery. Results Median urinary iodine of children aged 8 - 10 in Nangqian and Zaduo was < 100 μg/L. The percentage of median urinary iodine < 50 μg/L in Yushu was over 20%. Median urinary iodine of children aged 10 in Zaduo was 81.5 μg/L, the percentage of median urinary iodine < 50 μg/L of children aged 9 and 10 was over 20%. The percentage of median urinary iodine < 50 μg/L in children aged 9 and 10 of Yushu was over 20%. Median urinary iodine of girls in Zaduo was 87.1 μg/L, the percentage of median urinary iodine < 50 μg/L of boys in Zaduo was over 20%. The percentage of median urinary iodine < 50 μg/L of girls in Yushu was over 20%. Conclusions The iodine nutrition level of children aged 8 - 10 in Nangqian, Zaduo and Yushu counties were very low due to the impact of non-iodized salt. We propose salt market in the region to strengthen management and improve the coverage and consumption rates of iodized salt to improve the level of iodine nutrition for effective prevention of iodine deficiency disorders.

This study aimed to explore the anti-depressant components of Rehmanniae Radix and its action mechanism based on network pharmacology combined with molecular docking. The main components of Rehmanniae Radix were identified by ultra-high performance liquid chromatography-quadrupole/Orbitrap high resolution mass spectrometry(UPLC-Q-Orbitrap HRMS), and the related targets were predicted using SwissTargetPrediction. Following the collection of depression-related targets from GeneCards, OMIM and TTD, a protein-protein interaction(PPI) network was constructed using STRING. GO and KEGG pathway enrichment analysis was performed by Metascape. Cytoscape 3.7.2 was used to construct the networks of "components-targets-disease" and "components-targets-pathways", based on which the key targets and their corresponding components were obtained and then preliminarily verified by molecular docking. Rehmanniae Radix contained 85 components including iridoids, ionones, and phenylethanoid glycosides. The results of network analysis showed that the main anti-depressant components of Rehmanniae Radix were catalpol, melittoside, genameside C, gardoside, 6-O-p-coumaroyl ajugol, genipin-1-gentiobioside, jiocarotenoside A1, neo-rehmannioside, rehmannioside C, jionoside C, jionoside D, verbascoside, rehmannioside, cistanoside F, and leucosceptoside A, corresponding to the following 16 core anti-depression targets: AKT1, ALB, IL6, APP, MAPK1, CXCL8, VEGFA, TNF, HSP90 AA1, SIRT1, CNR1, CTNNB1, OPRM1, DRD2, ESR1, and SLC6 A4. As revealed by molecular docking, hydrogen bonding and hydrophobicity might be the main action forms. The key anti-depression targets of Rehmanniae Radix were concentrated in 24 signaling pathways, including neuroactive ligand-receptor interaction, neurodegenerative disease-multiple diseases pathway, phosphatidylinositol 3-kinase/protein kinase B pathway, serotonergic synapse, and Alzheimer's disease.
Drugs, Chinese Herbal/pharmacology* ; Humans ; Molecular Docking Simulation ; Network Pharmacology ; Neurodegenerative Diseases ; Plant Extracts ; Rehmannia