Micafungin sodium  (Synonyms: 米卡芬净钠; FK 463 sodium)

Each fungal isolate is incubated statically in yeast-maltose (YM) agar broth for 24 h at 30°C. Cryptococcus neoformans YC203 is grown in YM broth medium for 20 h at 30°C with shaking at 200 r.p.m. A cell suspension is prepared by washing the cultured cells once with sterile saline. A. fumigatus FP1305 is cultured on a potato dextrose agar (PDA) slant for 4 days, and spores are then harvested in sterile saline and collected by filtering through gauze. Antifungal activity against all isolates, with the exception of C. neoformans, is measured by the micro-broth dilution method in 96-well culture plates using RPMI 1640 medium supplemented with l-glutamine, but without sodium bicarbonate, and buffered to pH 7.0 with 0.165 m MOPS. ForC. neoformans, yeast nitrogen base-glucose (YNBD) medium is used. For the assay, the test microorganism is inoculated into each well to yield 1×10⁵ CFU/well, and the plates are then incubated for 20 h or 48 h at 37°C. Two end points are determined by microscopic observation: MEC, which is defined as a substantial reduction in fungal growth, and MIC, which is defined as a complete inhibition of growth.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Eight groups of ten female DBA/2 mice (7 weeks old) are intravenously injected with 2.0×10⁶ A. fumigatus FP1305 spores. The test groups receive the following treatments: AMPH at 1 mg/kg of body weight/dose given intraperitoneally (i.p.) once daily (q.d.); micafungin at 0.1, 0.32 or 1 mg/kg of body weight/dose given subcutaneously (s.c.) (q.d.); micafungin given s.c. (0.1, 0.32 or 1 mg/kgq.d.) plus KB425796-C given i.p. (32 mg/kg) twice daily (b.i.d.); and saline (b.i.d.). Drugs are administered on days 1 and 2. Five mice in each group are killed 1 day after the completion of treatment. The livers and kidneys are aseptically removed, and each organ is then homogenized in 5 mL sterile saline. Serial 10-fold dilutions of the homogenates are plated on PDA and incubated for 48 h at 37°C, and the numbers of CFU per gram of tissue are then calculated. The survival rate of remaining five mice of each group are examined daily for 31 days after the challenge.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

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  [2]. Kai H, et al. Synergistic antifungal activity of KB425796-C in combination with micafungin against Aspergillus fumigat us and its efficacy in murine infection models. J Antibiot (Tokyo). 2013 Jun 12.  [Content Brief]

  [3]. Ikeda F, Wakai Y, Matsumoto S, et al. Efficacy of FK463, a new lipopeptide antifungal agent, in mouse models of disseminated candidiasis and aspergillosis. Antimicrob Agents Chemother. 2000;44(3):614-618.  [Content Brief]

  [4]. Tawara S, Ikeda F, Maki K, et al. In vitro activities of a new lipopeptide antifungal agent, FK463, against a variety of clinically important fungi. Antimicrob Agents Chemother. 2000;44(1):57-62.  [Content Brief]

  [5]. Mikamo H, Sato Y, Tamaya T. In vitro antifungal activity of FK463, a new water-soluble echinocandin-like lipopeptide. J Antimicrob Chemother. 2000;46(3):485-487.  [Content Brief]