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| Changes of Neuronal Acetylcholine Receptor Alpha 7 of Peritoneal Macrophage in Experimental Acute Pancreatitis Treated by Chaiqin Chengqi Decoction (柴芩承气汤) |
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| KeyWord:acetylcholine, acute pancreatitis, Chaiqin Chengqi Decoction, cholinergic anti-inflammatory pathway, neuronal acetylcholine receptor alpha 7 |
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| Abstract: |
| Objective: To investigate effect of Chaiqin Chengqi Decoction (柴芩承气汤, CQCQD) on changes of neuronal acetylcholine receptor alpha 7 (nAChRα7) of peritoneal macrophages in acute pancreatitis (AP). Methods: Eighteen Kunming mice were equally randomized into the control group, AP group and CQCQD treatment group. AP was induced by two intraperitoneal injections of 4 g/kg L-arginine at 1 h apart, while control mice received saline injections. At 72 h after the first injection of L-arginine, mice in the treatment group were intragastrically administered 0.1 mL/10 g CQCQD every 2 h for 3 times, whilst mice in the other two groups received the same amount of saline feeding. Mice were sacrificed by cervical dislocation 2 h after the last feeding of either CQCQD or saline. Peritoneal macrophages were collected for determination of nAChRα7 mRNA and protein expression. Serum was collected for detection of interleukin-6 (IL-6), IL-10 and acetylcholine (ACh) levels, and pancreas was for histopathology analysis. Results: The CQCQD treatment significantly ameliorated the severity of AP as evidenced by reducing the pancreatic histopathology score (4.5±0.5 vs. 6.2±1.7, P<0.05) and the serum IL-6 levels (1228.3±419.2 pg/mL vs. 1589.6±337.3 pg/mL, P<0.05). The mRNA and protein expression of nAChRα7 of the peritoneal macrophages in the AP group were similar to the control group (P>0.05), but were significantly up-regulated after the CQCQD treatment (P<0.05). The serum ACh levels in the AP group were significantly lower than those in the control group (3.1±0.6 μg/mL vs 4.8±0.7 μg/mL P<0.05), but were significantly increased after the CQCQD treatment (5.6±1.5 μg/mL vs 3.1±0.6 μg/mL, P<0.05). Conclusion: CQCQD is protective against L-arginine-induced AP through mechanisms involving nAChRα7 of peritoneal macrophages. |
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