104987-12-4 Ascomycin AKSci L987
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  L987    AKSci Reference Standard
, 95% (HPLC)
Immunomycin, FR-900520, FK-520

CAS Number:104987-12-4
MDL Number:MFCD06198665
Min. Purity Spec:95% (HPLC)
Physical Form (at 20°C):Solid
Melting Point:155-157°C
Long-Term Storage:Store long-term at -20°C
Not hazardous material

Application(s):An immunosuppressive antibiotic FK506 analog


 Ascomycin is an ethyl analog of tacrolimus (FK506) with strong immunosuppressant properties. IC50 Value: 0.55 nM. Target: in vitro: When we used either CD4+CD8+ thymocytes or peripheral T cells activated by phorbol ester and ionomycin, the cell surface induction of CD5 was also partially blocked by CsA, FK-520 and rapamycin. Ascomycinalso had a 3-fold lower immunosuppressive potency in a popliteal lymph node hyperplasia assay, resulting in an equivalent therapeutic index consistent with a common mechanistic dependence on calcineurin inhibition. in vivo: In 14-day studies, nephrotoxicity was not induced by continuous i.p. infusion of ascomycin at 10 mg/kg/day or daily oral administration (up to 50 mg/kg/day) in rats on a normal diet, nor by continuous i.v. infusion (up to 6 mg/kg/day) in rats on a low salt diet to enhance susceptibility.

[1]Mollison KW, Fey TA, Krause RA, Nephrotoxicity studies of the immunosuppressants tacrolimus (FK506) and ascomycin in rat models. Toxicology. 1998 Feb 6;125(2-3):169-81.
[2] Teutsch M, Higer M, Wang D, Induction of CD5 on B and T cells is suppressed by cyclosporin A, FK-520 and rapamycin. Int Immunol. 1995 Mar;7(3):381-92.
[3] Hatanaka H, Kino T, Miyata S, FR-900520 and FR-900523, novel immunosuppressants isolated from a Streptomyces. II. Fermentation, isolation and physico-chemical and biological characteristics. J Antibiot (Tokyo). 1988 Nov;41(11):1592-601.



Signal Word

Hazard Statements
H315; H319; H335

Precautionary Statements
P261; P264; P271; P280; P302+P352; P304+P340; P305+P351+P338; P312; P321; P332+P313; P337+P313; P362; P403+P233; P405; P501

Current as of June 25, 2024

AKSci Reference Standards are high-purity, low-impurity compounds suitable for use as standards.

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 APIs and Bioactives > Immunomodulators