Effect of herbal cake-partitioned moxibustion on MEK1/2 and ERK1/2 expressions of gastric tissues in rats with spleen deficiency syndrome

Abstract

To observe the effect of herbal cake-partitioned moxibustion on the expressions of mitogen-activated protein kinase (MEK1/2) and extracellular regulatory protein kinase (ERK1/2) in gastric tissues of rats with spleen deficiency syndrome, and to explore the possible mechanisms of herbal cake-partitioned moxibustion in treating spleen deficiency syndrome. Sixty Sprague-Dawley (SD) rats were randomly divided into a blank control group (group A), a model group (group B), a ranitidine group (group C), and a herbal cake-partitioned moxibustion group (group D) by random digit, 15 rats in each group. Rat models of spleen deficiency syndrome were made by intragastric administration of 4 °C 200% concentrated Da Huang (Radix et Rhizoma Rhei). After successful modeling, the rats in group C were treated with 25 mg/(kg·bw) ranitidine by intragastric adminstration and rats in group D were treated with herbal cake-partitioned moxibustion at Zusanli (ST 36) and Zhongwan (CV 12), for 8 d. Excepted for rats in group A, all the other rats were treated with indomethacin at 5 mg/(kg·bw) at 8:00 a.m. on the second day after finishing all the intervention and sacrificed 7 h later to isolate the stomach. Histopathological changes of the gastric tissues were observed under light microscope after hematoxylin-eosin (HE) staining. The protein expressions of MEK1/2 and ERK1/2 in the gastric tissues were detected by immunohistochemistry. After intervention, the gastric mucosal injury in group B was significantly severer than that in group A, with large breakage and ablating; the damage of gastric mucosa was decreased in group C compared with group B; the gastric mucosal surface remained relatively complete, and the status of breakage and ablating was significantly improved. After intervention, compared with group A, the protein expressions of MEK1/2 and ERK1/2 in gastric tissues of the other groups were significantly higher (P<0.01). Compared with group B, the protein expressions of MEK1/2 and ERK1/2 in group C and D were significantly higher (all P<0.01). Compared with group C, the protein expressions of MEK1/2 and ERK1/2 in group D were significantly higher (P<0.01). Herbal cake-partitioned moxibustion promotes the repair of gastric mucosa in rats with spleen deficiency syndrome, via improving protein expressions of MEK1/2 and ERK1/2 in gastric tissues, as well as activating MEK/ERK signaling pathway.