ABSTRACT
OBJECTIVES: This study aimed to evaluate the potential role of hydrogen in rats after cerebral ischemic/reperfusion (I/R) injury. MATERIALS AND METHODS: The experimental samples were composed of sham group, model group of rats that received middle cerebral artery occlusion (MCAO) for 2 hr followed by reperfusion for 24 hr, and the hydrogen saline group treated by hydro¬gen-rich saline (1 ml/kg) after MCAO. Hydrogen sulfide (H2S), S100-ßprotein (S100-ß), and neuron-specific enolase (NSE) levels were measured; the levels of malondialdehyde (MDA), reactive oxygen species (ROS), and superoxide dismutase (SOD) were detected; the histologic structure and apoptotic cells of hippocampus were observed; the expressions of cystathionine ß-synthase (CBS), nuclear factor erythroid 2-related factor 2 (Nrf2), and hemeoxygenase-1 (HO-1) were measured. Statistical analyses were performed using one-way analysis of variance (ANOVA) followed by Fisher's least significant difference (LSD) test. RESULTS: Our results showed that hydrogen up-regulated H2S levels via promoting the expression of CBS in the hippocampus, and its treatment alleviated oxidative stress via activating the expression of Nrf2 and HO-1, and then cell apoptosis reduced, furthermore, brain function improved by down-regulating the levels of S100-ßand NSE. CONCLUSION: This study showed that hydrogen-rich saline ameliorates cell injury through up-regulating the expression of CBS in the hippocampus after cerebral ischemia reperfusion (I/R) in rats, this provides new experimental evidence for the treatment of stroke with hydrogen saline.
ABSTRACT
OBJECTIVE: To isolate and purify components from polysaccharides of purple sweet potato (PPSP) and to test their anti-tumor activity. METHODS: DEAE-Cellulose and CM-Cellulose exchange chromatography were applied to separate components of PPSP. The anti-tumor activities of each component were measured by MTT assay on Hela and HepG(2) cells and their monosaccharide composition were analyzed by TLC chromatography, followed by infrared spectroscopy studies. RESULTS: Through weak anion exchange chromatography and gradient elution by sodium chloride solution, four components were separated and named as PPSP, PPSPII, PPSPIII and PPSPIV, respectively. MTT tests showed that PPSP II and PPSPIII inhibited Hela and HepG2 tumor cells in a certain extent. The structural analysis revealed that PPSPI was mainly composed of glucose and galactose, PPSP II was composed of glucose and had a typical absorption peak of ß-D-glucose chitosan pyranose, PPSP III was a glycoprotein showing a protein absorption peak. CONCLUSION: Four components were separated from PPSP successfully, among which PPSP II and PPSP III shows anti-tumor activities on Hela and HepG(2) cells in vitro.
