Abstract
The antibacterial and anti-inflammatory activities, and protective effects of extracts (flavonoid glycosides) of Polygonum capitatum were investigated to detect the evidence for the utilization of the herb in the clinical therapy of gastritis caused by H. pylori. A mouse gastritis model was established using H. pylori. According to treating methods, model mice were random assigned into a model group (MG group), a triple antibiotics group (TG group, clarithromycin, omeprazole and amoxicillin), low/middle/high concentrations of flavonoid glycosides groups (LF, MF and HF groups) and low/middle/high concentrations of flavonoid glycosides and amoxicillin groups (LFA, MFA and HFA groups). A group with pathogen-free mice was regarded as a control group (CG group). The eradicate rates of H. pylori were 100%, 93%, 89% in TG, MFA and HF groups. The serum levels of IFN-gamma and gastrin were higher in a MG group than those from all other groups (P < 0.05). The serum levels of IFN-gamma and gastrin were reduced significantly in LF, MF and HF groups (P < 0.05) while little changes were observed in LFA, MFA and HFA groups. In contrast, the serum levels of IL-4 were lower and higher in MG and CG groups compared with other groups (P<0.05). The serum levels of IL-4 were increased significantly in LF, MF and HF groups (P < 0.05) while little changes were found in LFA, MFA and HFA groups. According to pathological scores, flavonoid glycosides therapy showed better protection for gastric injuries than the combination of flavonoid glycoside and amoxicillin (P < 0.05). The results suggested that flavonoid glycoside has repairing functions for gastric injuries. The results suggest that the plant can treat gastritis and protect against gastric injuries. The flavonoid glycosides from Polygonum capitatum should be developed as a potential drug for the therapy of gastritis caused by H. pylori.
Highlights
Helicobacter pylori (H. pylori) infection is the main cause of chronic inflammation, which is the second leading cause of gastric cancer in the world [1]
The OD of lymphocytes reached the lowest level when the concentration of flavonoid glycoside was 512 ug/mL (Table 1).The results suggest that certain concentrations of flavonoid glycoside will not affect the proliferation of lymphocytes while the high concentrations of flavonoid glycoside will inhibit the proliferation of lymphocytes by its toxicity
We investigated the effects of flavonoid glycoside and amoxicillin on the mRNA levels of IFNgamma, IL-4, gastrin and somatostatin, which can reflect the degrees of H. pylori infection [33, 43,44,45]
Summary
Helicobacter pylori (H. pylori) infection is the main cause of chronic inflammation (gastritis), which is the second leading cause of gastric cancer in the world [1]. Flavonoid Glycosides and Bacteria Infection province and Medical College of Guiyang (No LG (2012) and LG(2012)054), Specialized Program Construction Project in University (No 21 (No.[2010] 15), the Science and Technology Program of Guizhou (No [2014]2027), The Ph.D. Programs Foundation of Affiliated hospital of Guiyang Medical College (No 2014) and College students' innovative entrepreneurial training program of Guizhou (No.201410660014). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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