title: Thymidine phosphorylase activity required for tumor angiogenesis and growth.
abstract: Thymidine phosphorylase (TP) is identical to platelet-derived endothelial cell growth factor (PD-ECGF), and has angiogenic activity. We examined the involvement of TP activity in tumor growth and angiogenesis. KB cells were transfected with wild-type or mutant (L148R) PD-ECGF cDNA, and two sublines with high TP activity, KB/wt4 and KB/wt6, and one subline with no TP activity, KB/L148R, were cloned, respectively. The doubling times of these subclones in vitro were similar to that of KB cells. However, the growth of KB/wt4 and KB/wt6 cells was significantly faster when xenografted into nude mice than that of control cells with no TP activity. The tumors with high TP activity (KB/wt4 and KB/wt6) had significantly more microvessels than those with no TP activity (KB/-, KB/CV and KB/L148R) (P<0.01). These results, taken together with previous reports, suggest that the TP enzyme activity itself is involved in angiogenesis and growth of the KB tumors.
authors: KAGOSHIMA UNIV,CANC RES INST,DEPT CANC CHEMOTHERAPY,KAGOSHIMA 890,JAPAN. KAGOSHIMA UNIV,DEPT OTOLARYNGOL,KAGOSHIMA 890,JAPAN. KAGOSHIMA UNIV,DEPT SURG 1,KAGOSHIMA 890,JAPAN. TAIHO PHARMACEUT CO LTD,SAITAMA 357,JAPAN.
authors: K
authors: K
authors: Nishimoto
authors: K
authors: K
authors: Miyadera
authors: Y
authors: Y
authors: Takebayashi
authors: K
authors: K
authors: Fukuda
authors: M
authors: M
authors: Haraguchi
authors: T
authors: T
authors: Furukawa
authors: Y
authors: Y
authors: Yamada
authors: S
authors: S
authors: Akiyama