Table II.

Protein expression levels of SS and VIP in the blood and colonic mucosa.

	SS (ng/l)		VIP (ng/l)
Group	Blood	Sigmoid colon	Blood	Sigmoid colon
Control	27.43±18.45	18.21±6.24	35.81±19.30	725.43±179.23
IBS-C	170.23±38.47a	256.20±178.41a	51.73±29.53a	1,234.07±472.83a
IBS-D	59.82±20.63ab	35.73±17.47ab	53.34±21.64ac	1,210.75±384.73ac

Data are presented as the mean ± standard deviation.

^aP<0.05 versus the control group;

^bP<0.05 versus the constipation predominant irritable bowel syndrome (IBS-C) group;

^cP>0.05 versus the IBS-C group.

SS, somatostatin; VIP, vasoactive intestinal peptide. IBS-D, diarrhea predominant IBS.