title: Effects of DN-9693, a new metastasis inhibitor, on murine hematogenous metastasis.
abstract: 1,5-Dihydro-7-(1-piperidinyl)-imidazo[2,1-b]quinazolin-2(3H)-one dihydrochloride hydrate (DN-9693), a new c-AMP: phosphodiesterase inhibitor was examined for its inhibitory effects on platelet aggregation induced by metastasizing tumor cells and on blood-borne metastases of these tumors. 1-3 microM of DN-9693 completely inhibited platelet aggregation induced by B16 melanoma subline BL6 and Lewis lung carcinoma (3LL) cells. Platelets prepared from mice intravenously or orally administered with DN-9693 failed to aggregate after the addition of BL6 cells. Intravenous injection of DN-9693 was effective in protecting the mice inoculated with 1 X 10(6) BL6 cells against acute pulmonary embolic death. Either intravenous or oral administration of DN-9693 (1-10 mg/kg) sufficiently suppressed thrombus formation and subsequent pulmonary metastasis caused by intravenously inoculated BL6 or 3LL cells. Spontaneous pulmonary metastasis of 3LL was also inhibited by DN-9693. Continuous administration of DN-9693 during and after surgical excision of the primary tumors was the most effective treatment against the development of pulmonary metastases of 3LL.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D008175:Lung Neoplasms / Q000556:secondary; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009362:Neoplasm Metastasis; D010974:Platelet Aggregation / Q000187:drug effects; D011799:Quinazolines / Q000494:pharmacology*; D013923:Thromboembolism / Q000517:prevention & control
chemical_list: D000970:Antineoplastic Agents; D011799:Quinazolines; C049662:1,5-dihydro-7-(1-piperidinyl)-imidazo(2,1-b)quinazolin-2(3H)-one; D015105:3',5'-Cyclic-AMP Phosphodiesterases