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IL-6 inhibits colonic longitudinal muscle contraction by inactivating L-type calcium channel in rats with pancreatitis 

TANG Ya¹, LIANG Shi-Wei¹, QUAN Xiao-Jing², LUO He-Sheng², LIU Ying^1,*

¹Department of Gastroenterology, The Second Affiliated Hospital of Guilin Medical University, Guilin 541100, China；²Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan 430060, China

Abstract

The aim of this study was to investigate the effect of interleukin 6 (IL-6) on the contraction of colon longitudinal muscle strips in rats with acute pancreatitis (AP) and its underlying mechanism. Rat AP model was established by combined injection (i. p.) of ceruletide and lipopolysaccharide. The effect of IL-6 on spontaneous contraction of longitudinal smooth muscle strips of rat colon was observed by biological function experiment system. The level of serum IL-6 was detected by ELISA, the expression and distribution of IL-6 in colon were observed by histochemical staining, and the effect of IL-6 on L-type calcium channel in colon smooth muscle cells was observed by whole cell patch clamp technique. The results showed that, compared with the control group, AP group exhibited reduced contractile amplitude and longer contraction cycle of colon smooth muscle strips. IL-6 prolonged the contraction cycle of colon smooth muscle strips, but did not affect their spontaneous contraction amplitude. Serum IL-6 concentration in AP group was significantly higher than that in control group (P < 0.05). IL-6 was diffusely distributed in the colon of the control group, but the expression of IL-6 was significantly up-regulated in the colon gland, mucosa and submucosa of the AP group. IL-6 significantly decreased the peak current density of L-type calcium channel in rat colon smooth muscle cells. These results suggest that the colon motility of AP rats is weakened, and the mechanism may be that up-regulated IL-6 inactivates L-type voltage-dependent calcium channels, and then inhibits the contraction of colon longitudinal smooth muscle.

Key words: acute pancreatitis; interleukin-6; smooth muscle cells; L-type calcium channel; patch clamp

Received: 2019-02-09　　Accepted: 2019-07-22

Corresponding author: 刘颖　　E-mail: liuying1009@sina.com

DOI: 10.13294/j.aps.2019.0069

Citing This Article：

TANG Ya, LIANG Shi-Wei, QUAN Xiao-Jing, LUO He-Sheng, LIU Ying. IL-6 inhibits colonic longitudinal muscle contraction by inactivating L-type calcium channel in rats with pancreatitis . Acta Physiol Sin 2019; 71 (5): 717-724 (in Chinese with English abstract).