Miriplatin  (Synonyms: SM-11355)

Aliquots of AH109A cells are plated into 24-well microplates. Following cell adherence (1 day), Lipiodol (LPD) alone and agents (Miriplatin, etc.) suspended in LPD are added to Falcon cell culture inserts, equipped with a 0.4-μm pore membrane on their bottom. After 7 days of incubation at 37°C in 5% CO₂, the numbers of viable cells are examined using AlamarBlue. The IC₅₀ value is defined as the concentration inhibiting cell growth by 50% compared with treatment with LPD alone. To examine platinum concentrations in the medium, agents suspended in LPD are added to Falcon cell culture inserts in wells containing the culture medium alone. The platinum concentrations are quantitatively analyzed by FAAS. Alternatively, aliquots of AH109A cells are plated into 96-well microplates. Following cell adherence (1 day), agents in aqueous solution are added. After 3 days of incubation at 37°C in 5% CO₂, the numbers of viable cells are examined using AlamarBlue^[2].

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Rats^[2]
Rats bearing a tumor approximately 100-250 mm³ in area are randomly allocated into different treatment groups and a control group, each of which consists of seven rats. Tumor diameters are measured with calipers, and estimated tumor area is calculated by the formula: (smaller diameter) × (larger diameter). All agents (Miriplatin, etc.) suspended in Lipiodol (LPD) and LPD alone are injected into the hepatic artery of tumor-bearing rats at the volume of 0.02 mL/head. The therapeutic dose of each agent is defined in this study as follows: Miriplatin (400 μg/head, 20 mg/mL in LPD), cisplatin (400 μg/head, 20 mg/mL) and zinostatin stimalamer (20 μg/head, 1 mg/mL). After the intra-hepatic arterial administration, the gastroduodenal artery and abdomen are closed with uninterrupted sutures. The tumor growth rate (%) is calculated with the following formula: A₇/A₇₀ × 100, where A₇ is the estimated tumor area at day ₇ and A₇₀ is the estimated tumor area at the initiation of the treatment (day 0). The systemic toxicity of the treatments is assessed in terms of changes in body weight during the experiments. These are calculated as (W₇ − W₇₀)/W₇₀ × 100 where W₇ is body weight at day ₇ and W₇₀ is body weight at day 0^[2].

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• [1]. Kishimoto S, et al. Antitumor effects of a novel lipophilic platinum complex (SM-11355) against a slowly-growing rat hepatic tumor after intra-hepatic arterial administration. Biol Pharm Bull. 2000 Mar;23(3):344-8.  [Content Brief]

  [2]. Hanada M, et al. Intra-hepatic arterial administration with miriplatin suspended in an oily lymphographic agent inhibits the growth of tumors implanted in rat livers by inducing platinum-DNA adducts to form and massive apoptosis. Cancer Chemother Pharmaco  [Content Brief]