化学性质：                                                                                                             

产品描述：                                                                                                            

IC50: Inhibit protein phosphatase types 2A (PP2A) and 4 (PP4) intensively with an IC50 of 1.5 nM and 3 nM respectively. Inhibit topoisomerase II (Topo II) and protein phosphatase type 1 (PP1) slightly with an IC50 of 40 μM and 131 μM respectively.

Fostriecin, an anti-tumor antibiotic originates from Streptomyces pulveraceus, is considered to exert its activity by interfering the reversible phosphorylation of several important proteins in cell cycle. Fostriecin sodium salt also exhibits anti-tumor activity via suppressing enzymes including PP2A, PP4, PP1 and Topo II. [1]

In vitro: A human tumor cloning assay was adopted to investigate the antineoplastic activity of fostriecin. Variety of histologic tumor cells exposure to 10 mg/ml fostriecin resulted in 27% in vitro anticancer response. In another study using HeLa cells, by suppressing the Topo II catalytic activity, 0.22 mM fostriecin could lead to more than 90% inhibition of cancer cell DNA synthesis. [2,3]

In vivo: Fostriecin showed intensively cytotoxicity against a number of cancer cell lines and had a strong antitumor effect in animals. 10 mg/ml fostriecin could substantially suppress P388 and L1210 leukemias in mice. [2,3]

Clinical trial: Fostriecin reached clinical phase I study sponsored by the National Cancer Institute to investigate its antitumor activity in human. With dosages escalated from 2 to 20 mg/m2/day, fostriecin was administered as a 60-min intravenous (IV) infusion to 20 patients in cancer for 5 days. Although the trials were suspended due to the concerns about the storage stability of this naturally originated compound, this discovery ignited a broad interest in derivatives of fostriecin. [1,4]

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