ZHANG Ran,YANG Kun,ZENG Zhenjun,et al.Effects of Codonopsis pilosula polysaccharide on gastric mucosal injury in rats with chronic atrophic gastritis[J].ZHONGGUO YAOFANG,2024,35(16):1985-1990.
polysaccharide (CPP) regulating the nuclear factor-erythroid 2-related factor 2 (Nrf2)/heme oxygenase-1 (HO-1) signaling pathway on gastric mucosal injury in rats with chronic atrophic gastritis (CAG).
METHODS
2
Rats were randomly divided into control group, model group, CPP low-dose, medium-dose and high-dose groups (CPP 10, 20, 40 mg/kg), and ML385 group (Nrf2 inhibitor ML385 30 mg/kg+CPP 40 mg/kg), 10 rats per group. CAG rat model was established using
N
-methyl-
N
′- nitro-
N
-nitrosoguanidine combined with irregular diet, then they were given drugs for consecutive 6 weeks. HE staining was used to observe the pathological changes in gastric tissue morphology; the levels of serum gastrin (GAS), motilin (MTL), pepsin (PP), as well as tumor necrosis factor-α (TNF-α), interleukin-8 (IL-8) malondialdehyde (MDA) and superoxide dismutase (SOD) in gastric mucosal tissue were detected; TUNEL assay was used to observe gastric mucosal tissue cell apoptosis; immunohistochemical assay was adopted to observe the expressions of Nrf2 and recombinant Bcl2 associated X protein (Bax) in gastric mucosal tissue; Western blot was used to detect the expressions of Nrf2, HO-1, Bax and Bcl-2 proteins in gastric mucosal tissue.
RESULTS
2
Compared with the control group, the gastric mucosal tissue was damaged; the levels of GAS, MTL, PP and SOD, and the protein expressions of Nrf2, HO-1 and Bcl-2 were significantly reduced in model group (
P
<0.05), while the levels of MDA, TNF-α and IL
-8, the cell apoptosis index, and the protein expression of Bax were significantly increased (
P
<0.05). Compared with model group, CPP low-dose, medium-dose and high-dose groups showed varying degrees of improvement in gastric mucosal histopathology; the levels of the quantitative indicators were significantly reversed (
P
<0.05). Nrf2 inhibitor ML385 significantly attenuated the improvement effect of high-dose CPP on the above indicators in CAG rats (
P
<0.05).
CONCLUSIONS
2
CPP can improve gastric mucosal injury in CAG rats, and inhibit oxidative stress, inflammatory response, and cell apoptosis. The mechanism of action may be related to the activation of Nrf2/HO-1 signaling pathway.
关键词
Keywords
references
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