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Chai-Qin-Cheng-Qi decoction (CQCQD) improves intestinal motility in acute pancreatitis (AP), but the mechanism(s) require elucidation. We investigated the effects of CQCQD and carbachol, a prokinetic agent, on colonic smooth muscle cells (SMCs) in L-arginine-induced necrotising AP model in rats. In treatment groups, intragastric CQCQD (20 g/kg, 2 hourly × 3 doses) or intraperitoneal carbachol (60  μ g/kg) was given 24 hours after induction of AP. Both CQCQD and carbachol decreased the severity of pancreatic and colonic histopathology (all  P  < 0.05). Both CQCQD and carbachol reduced serum intestinal fatty acid binding protein, vasoactive intestinal peptide, and substance P and increased motility levels. CQCQD upregulated SMC phospholipase C-beta 1 (PLC- β 1) mRNA and PLC protein (both  P  < 0.05), while both treatments upregulated protein kinase C-alpha (PKC- α ) mRNA and PKC protein and downregulated adenylate cyclase (AC) mRNA and protein compared with no treatment (all  P  < 0.05). Neither treatment significantly altered L-arginine-induced PKC- β 1 and PKC- ε  mRNA reduction. Both treatments significantly increased fluorescence intensity of SMC intracellular calcium concentration [Ca 2+ ] i  (3563.5 and 3046.9 versus 1086.9, both  P  < 0.01). These data suggest CQCQD and carbachol improve intestinal motility in AP by increasing [Ca 2+ ] i  in colonic SMCs via upregulating PLC, PKC and downregulating AC.

evidence-based complementary and alternative medicine

Chai-Qin-Cheng-Qi Decoction and Carbachol Improve Intestinal Motility by Regulating Protein Kinase C-Mediated Ca<sup>2+</sup>Release in Colonic Smooth Muscle Cells in Rats with Acute Necrotising Pancreatitis

Chai-Qin-Cheng-Qi Decoction and Carbachol Improve Intestinal Motility by Regulating Protein Kinase C-Mediated Ca2+Release in Colonic Smooth Muscle Cells in Rats with Acute Necrotising Pancreatitis

Chai-Qin-Cheng-Qi Decoction and Carbachol Improve Intestinal Motility by Regulating Protein Kinase C-Mediated Ca²⁺Release in Colonic Smooth Muscle Cells in Rats with Acute Necrotising Pancreatitis