Objective To investigate the mechanism and clinical significance of vincristine (VCR) inhibiting gastrinproliferation effects on human colon cell line SW480. Methods Effects of VCR on the viable cell count (A value), myoinositol triphosphate (IP3, CPM value), 〔Ca2+〕i and protein kinase C (PKC) activity of human colon cell line SW480 were evaluated in vitro by MTT assay,3Hmyoinositol incorporation, fluorescence measurements and γ-32P-ATP incorporation.Results A value of VCR+PG group was lower than that of PG or control group (Ｐ＜0.01 vs control, Ｐ＜0.01 vs PG). The concentration of IP3 or 〔Ca2+〕i in VCR+PG group was lower than that in PG group (Ｐ＜0.01 vs PG); and the PKC activity of membrane was lower than that in PG group (Ｐ＜0.05 vs PG, Ｐ＞0.05 vs control). Conclusion Effects of vincristine may be through the phosphoinositide signaling pathway on gastrinstimulating cell proliferation in human colon cell line SW480. It has provided an experimental evidence for antisignaling therapy for patients with colon cancer.
Objective To observe the efficacy of all trans retinoic acid (ATRA) combined with 5-Fu on treating subcutaneously implanted gastric carcinoma SGC 7901 in the nude mice. Methods Thirty-two nude mice bearing tumor were randomly divided into 4 groups: control group (group A), ATRA 1 000 μg/d orally taken group (group B), 5-Fu 27 mg/kg group peritoneally injected (group C), 5-Fu 13.5 mg/kg combined with ATRA 500 μg/d group (group D). Results Significant inhibition of tumor growth was shown in the group B, group C and group D as compared with group A (Ｐ＜0.01), with the tumor growth inhibition rate and the tumor weight inhibition rate at the 7 weeks after the treatment being 56.88%, 49.00%, 70.00% and 56.10%, 51.64%, 76.95%. Conclusion ATRA combined with 5-Fu can enhance the effects of 5-Fu in treating gastric carcinoma.