BACKGROUND:Many scholars have experimental y confirmed the obvious effect of mesenchymal stem cells to repair radiation injury. OBJECTIVE:To preliminarily investigate the mechanism of human umbilical cord mesenchymal stem cells promoting the healing of combined radiation-wound skin injury and whether they possess tumorigenicity in vitro. METHODS:Fifteen Sprague-Dawley rats were randomly divided into three groups, five rats in each group. The right buttock of rats (2.5 cm×2.0 cm) was irradiated with 40 Gyβ-rays produced by a linear accelerator, in which a round wound with a diameter of 1.5 cm was made. After 12 hours of modeling, human umbilical cord mesenchymal stem cells at three concentrations (5.0×106, 1.0×107 and 2.0×107 ) were injected through tail vein of rats, and luciferin (20 mg/kg) was injected intraperitoneal y. celldistribution in vivo was traced using IVIS in vivo imaging system. The ability of human umbilical cord mesenchymal stem cells to form colonies was observed using the colony formation assay with soft agar. RESULTS AND CONCLUSION:Human umbilical cord mesenchymal stem cells injected through tail vein of rats were mostly gathered in the lungs. cells were accumulated in the injured site of rats injected with 2.0×10 7 human umbilical cord mesenchymal stem cells;however, the fluorescence signal was not observed in the injured site of rats injected with 5.0×106 and 1.0×107 human umbilical cord mesenchymal stem cells. The other results indicated human umbilical cord mesenchymal stem cells of low dose, medium dose and high dose had no colony formation on soft agar, but the tumor cells had a great ability to form colony. These findings indicate that human umbilical cord mesenchymal stem cells promote healing combined radiation-wound skin injury by local migration and exhibit no tumorigenicity in vitro in a short period.

To investigate the protective effect of the seed oil of Abelmoschus esculentus on gastric ulcer,two acute gastric ulcer mice models were established by intragastric administration of aspirin or absolute ethanol,respectively.Clinical index of ulcer area,ulcer index,gastric volume,gastric pH value,free acidity,total acidity,and histopathological assessment were measured to evaluate the injuries of gastric ulcer and the protective effect of okra seed oil In order to comprehensively uncover the possible underlying mechanism,a series of biochemical assays were also performed,including serum TNF-α,IL-6,IL-10 and Tbil,NO,MPO and SOD in the stomach included.Moreover,the ALT,AST and ALP in the liver of mice were also tested to evaluate the possible hepatic toxicity of the seed oil.The results indicated that the seed oil of A.esculentus exerted protective effect in ethanol-induced gastric ulcer mice by reducing the ulcer area and ulcer index,declining the free and total acidity,and increasing the pH value of gastric content.Histopathological observation showed the gastric mucosa of the acute gastric ulcer mice induced by alcohol was incomplete and severely damaged,with submucosal edema and nuclear pyknosis,as well as glandular structure disappearing,compared with that of normal mice.What's more,a number of inflammatory cell infiltration occured in the gastric mucosa of alcohol-model mice,with messes of neutrophils,lymphocytes,eosinophils and plasma cells.Okra seed oil could improve the damaged structure of the gastric mucosa and gland caused by ethanol,but could not ameliorate the condensation of nucleus and infiltration of inflammatory cells.Biochemical analysis revealed that the seed oil of A.esculentus could counteract the damage induced by ethanol via decreasing Tbil and TNF-α in serum,decreasing NO and myeloperoxidase,and increasing SOD in stomach.Meanwhile,okra seed oil exhibited protective effect in aspirin-induced gastric ulcer mice by increasing the gastric content pH,and reducing free and total acidity.Compared with the control group,the gastric mucosa of aspirin-model group showed multifocal coagulation necrosis,sheet edema and infiltration of inflammatory cells by histopathological assessment.Compared with the aspirin-model group,the soybean oil group and okra seed oil group could ameliorate the inflammatory cell infiltration.Biochemical analysis revealed that okra seed oil could counteract the injury induced by aspirin via decreasing TNF-α and IL-6,and increasing IL-1O in serum,decreasing NO and MPO and increasing SOD in stomach.In a word,the okra seed oil exerted protective effect on acute gastric ulcer by anti-inflammation,anti-oxidation and hepatocyte protection.The okra seed oil deserves further development and utilization.

OBJECTIVETo develop an HPLC-DAD-ELSD method for detecting the fingerprint of Astragali Radix and evaluate the quality through similarity calculation and chemical pattern recognition.

METHODSeparation was performed at 25 degreeC on an Agilent Zorbax ODS C18 column(4.6 mm x250 mm,5 microm). Gradient elution was performed with the mobile phases of acetonitrile and water containing 0. 2% formic acid. The flow rate was 0. 8 mL min-1 , and sample size was 10 microL. The UV detection wavelength was set at 280 nm. The drift tube temperature for ELSD was set at 110 degreeC , and the nebulizing gas flow rate was 3.0 L min-1. The similarity calculation and chemical pattern recognition were used for fingerprint analysis.

RESULTThe HPLC-DAD-ELSD method for chromatographic fingerprint of Astragali Radix showed better results of stability, precision and repeatability. The reference chromatographic fingerprint of Astragali Radix was established on the eighteen Astragali Radix samples from different sources. The results of similarity calculation were higher than 0. 83, which was in accordance with the result of chemical pattern recognition analysis.

CONCLUSIONFingerprint and chemical pattern recognition analysis could effectively distinguish Astragali Radix from different source, which could be applied to the quality control of Astragali Radix.

Astragalus Plant ; chemistry ; Chromatography, High Pressure Liquid ; methods ; Drugs, Chinese Herbal ; chemistry ; Temperature

OBJECTIVETo determine the content of puerarin in Xiaoke pill powder rapidly by near-infrared spectroscopy.

METHODNear-infrared diffuse reflectance spectroscopy technology was used to collect NIR spectra of Xiaoke pills powder. With HPLC analysis values as reference, the fast determination method of puerarin was established with partial least squares (PLS).

RESULTThe R2, RMSECV and RPD of the calibration model for puerarin were 0.980 1, 0.131 and 7.09. The average relative deviation of the predication set was 3.2%.

CONCLUSIONThe method is accurate, fast and simple, which could be generalized to the on-line quality control of Xiaoke pill powder production.

Drugs, Chinese Herbal ; analysis ; Isoflavones ; analysis ; Powders ; Spectroscopy, Near-Infrared ; methods ; Time Factors

Objective:To study the clinical value of bladder stimulation technique (BST) for clean-catch urine collection in late newborns.Methods:From November 2020 to March 2022, relatively stable late newborns hospitalized in the Department of Neonatology of our hospital were enrolled in the prospective randomized controlled trial. The newborns were assigned into BST group and control group. In BST group, urine was collected using BST (suprapubic tapping alternating with lumbosacral massage for 5 min) 20~30 min after feeding and specimen were collected using urine bag before and after BST. In the control group, urine was collected using urine bag method. The urine collection was considered successful if >1 ml of urine not contaminated by faeces were collected within 60 min. The t-test and χ 2 test were used for data analysis. Results:A total of 231 late newborns were included with 117 cases in BST group and 114 in control group. The rate of successful urine collection in BST group was higher than control group (65.8% vs. 39.4%).The time needed for successful urine collection [(30.2±8.5) min vs. (40.7±12.9) min], the incidences of faeces contamination (2.5% vs. 21.1%) and urine contamination (11.7% vs. 26.7%) in BST group were all significantly lower than control group(all P<0.05). Male and female newborns in BST group had similar success rates of urine collection (65.6% vs. 66.0%). Male newborns in BST group had similar urine contamination rate with control group (9.5% vs. 11.5%) and female newborns in BST group had significantly lower urine contamination rate than control group (14.3% vs. 47.4%, P<0.05). Urine was successfully collected in 71 newborns in BST group with median duration of BST for 81 (61,132) s. No adverse effects were observed except for transient consolable crying. Conclusions:Compared with urine bag collection method, BST improves successful urine collection rates and reduces the time needed for urine collection and urine contamination rates (especially for females).