ABSTRACT
Aim The present study was designed to investigate the contractile responses to vasoconstrictors in artery supplying colon carcinoma.Methods The artery supplying carcinoma was obtained from patients suffering from colonic carcinoma. The artery supplying carcinoma ambient normal tissue from patients with colon carcinoma and normal artery from patients with accident were used to control. Artery were cut into about 1 mm long cylindrical segments. The concentration-contractile curves induced by 4 vasoconstrictors were recorded. Results In the normal artery, the E_max and pEC_50 of contraction induced by noradrenaline (NA) were 97%?19% and 5.94?0.17(n=5), respectively; while in the artery supplying carcinoma, the E_max and pEC_50 of contraction induced by NA were 74%?5% and 5.54?0.21(n=5). In the artery supplying cancer ambient normal tissue, the E_max and pEC_50 of contraction induced by NA were 119%?11% and 5.84?0.09, respectively. The E_max in artery supplying carcinoma induced by NA was lower than that in normal arteries(P