The model of stomach smooth muscle cells contraction of rats and the effects of treatment drugs in vitro / 中国药理学通报

ABSTRACT

AIM To set up the model of stom- effects of its treatment drugs. METHODS To ap-ach smooth muscle cells contraction and assess the ply the culture of isolated stomach fundus smooth muscle cells in rats in vitro and to obtain the mixture of stomach smooth muscle cells. The cells were examined with the Trypan blue dilution technology under microscope and the length of cells and the contraction rate of muscle cells were adopted to the evaluation index of effects. The change of cells in different time was observed and calculating the survival rate and time of cells. The selected neuro-medium and its antagonist, such as acetyl-choline chloride (ACh) and atropine, 5-HT and domperidone(Domp) , histamine( His) and diphen-hydramine(Diph) were added to the mixture cells so as to provoke irritant reaction observe the effects of drugs. RESULTS Obtaining cells in stomach fundus smooth muscle was more than 1 X 106 in each rat by this way, and the survival rate and time of cells was 95% and 2. 5 h. The contraction of cells was observed after adding ACh 5-HT or His ,and the effects of these agents were antag- onized by antagonist atropine, Domp and Diph respectively. The effects of maximum contraction of ACh in concentration 1?10-8 mol ? L-1 was 38%, and in 5-HT may exist two receptors, and the maximum rate was 20. 7% and 10. 5% respectively. The effective dose of contraction was 1 X 10-13 -1?10-10 mol ? L-1 induced by His, the contraction effects was significantly weakened in high of 1 ?10-10 mol ? L-1 and antagonized by Diph. CONCLUSION The smooth muscle cells by digesting stomach fundus smooth muscle of rats would be more than 95% survivors and survival time was more than 2. 5 h. ACh,5-HT and His could induce the contraction of smooth muscle cells, and the effects of contraction were antagonized by atropine, Domp and Diph respectively.