[Effect of Sijunzi Decoction Polysaccharide on IEC-6 Cell Migration,Potassium Channel and Membrane Potential].

Objective: To investigate the effect of Sijunzi decoction polysaccharide( SJZDP) on intestinal epithelial cells( IEC-6)cell migration and polyamine signaling pathway potassium channel during intestinal epithelial cell migration, and to explore the mechanism of SJZDP on promoting gastrointestinal mucosal restitution after wounding.

Methods: Cell migration model was established by scratch damage, and then the effect of SJZDP normal cultured or with difluoromethylornithine( DFMO) and 4-aminopyridine( 4-AP) on IEC-6 cell migration was observed and calculated on this wounding model. The effect of SJZDP on expression of IEC-6 cell kv1. 1 mRNA and protein levels were detected by RT-q PCR and Western blot analysis, respectively. The Effects of SJZDP on IEC-6 cell membrane potential were detected by flow cytometry.

Results: The results showed that treatment with SJZDP( 40,80,160 mg / L) caused a promotion of IEC-6 cell migration,and increased of expression of in IEC-6 cell kv1. 1 mRNA and protein significantly( P < 0. 05 or P < 0. 01) compared with normal control group. In addition, SJZDP( 40,80,160 mg / L) increased cell membrane potential which resulted in cell membrane hyperpolarization compared with normal control group( P < 0. 05 or P < 0. 01). SJZDP( 40,80,160 mg / L) reversed the inhibition of cell migration was reduced,kv1. 1 mRNA,kv1. 1 protein expression, and cell membrane potential were decreased by polyamines synthesis inhibitor DFMO compared with DFMO model group( P < 0. 05 or P < 0. 01). SJZDP( 20,40,80 mg / L) reversed the inhibition of cell migration,kv1. 1 protein and mRNA levels expression were decreased by potassium channel inhibitor 4-AP compared with 4-AP model group( P < 0. 05 or P < 0. 01).

Conclusion: These results indicate that the effect of SJZDP on promoting IEC-6 cell migration may be related to its influence on polyamine signaling pathway potassium channel and cell membrane potential.